(19)
(11)EP 3 460 387 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
13.05.2020 Bulletin 2020/20

(21)Application number: 18156162.2

(22)Date of filing:  09.02.2018
(51)Int. Cl.: 
G01B 11/06  (2006.01)

(54)

DISPLACEMENT MEASURING DEVICE, MEASURING SYSTEM AND DISPLACEMENT MEASURING METHOD

WEGMESSVORRICHTUNG, MESSSYSTEM UND WEGMESSVERFAHREN

DISPOSITIF DE MESURE DE DÉPLACEMENT, SYSTÈME DE MESURE ET PROCÉDÉ DE MESURE DE DÉPLACEMENT


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 26.09.2017 JP 2017184995

(43)Date of publication of application:
27.03.2019 Bulletin 2019/13

(73)Proprietor: OMRON CORPORATION
Kyoto-shi, Kyoto 600-8530 (JP)

(72)Inventors:
  • KONDO, Tomonori
    Kyoto-shi, Kyoto 600-8530 (JP)
  • SUZUKI, Yuta
    Kyoto-shi, Kyoto 600-8530 (JP)
  • MATOBA, Kenichi
    Kyoto-shi, Kyoto 600-8530 (JP)
  • KANETANI, Yoshihiro
    Kyoto-shi, Kyoto 600-8530 (JP)

(74)Representative: Emde, Eric 
Wagner & Geyer Partnerschaft mbB Patent- und Rechtsanwälte Gewürzmühlstrasse 5
80538 München
80538 München (DE)


(56)References cited: : 
EP-A1- 1 167 918
DE-A1-102015 121 673
EP-B1- 2 010 863
US-A1- 2005 213 112
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    BACKGROUND


    Technical Field



    [0001] The invention relates to a displacement measuring device, a system including the displacement measuring device and a displacement measuring method.

    Description of Related Art



    [0002] Conventionally, for example, as disclosed in JP 2012-208102 A, a displacement measuring device using a white confocal method as a measuring method is known. In this displacement measuring device, while a non-contact type sensor head moves, a distance (displacement) between a measurement target and the sensor head is continuously measured.

    [0003] Further, there is a workpiece in which quality control is performed by measuring a thickness or a displacement of a component on the basis of reflected light from a plurality of positions. As such a workpiece, there are, for example, a workpiece (anti-reflection processed optical component, such as an anti-reflective (AR) coat, or the like) including a material which hardly reflects light, and a workpiece having a multilayer structure (a group of assembled lenses, or the like).

    [0004] Further, conventionally, as disclosed in JP 2013-90045 A, a displacement measuring device using a triangulation method as a measuring method is known.

    [0005] DE 10 2015 121673 A1 discloses a method which includes a step of initially determining a coarse position of a light line image by a position scan with reduced resolution and therefrom automatically defining windows on a sensor which include an entire line image so that the data only has to be read from the windows during the subsequent measuring scan which is performed with a higher resolution compared to the position scans.

    [0006] US 2005/213112 A1 discloses a displacement sensor device capable of fast data read-out processing. A sensor device includes: a light-emitting element for irradiating an object to be measured with light at a prescribed angle; an image pickup element for shooting the light-irradiated object to be measured at another angle; a normal measurement area setting device capable of setting a normal measurement area in the visual field of the image pickup element; a receiving-light signal detecting device for detecting a receiving-light signal distribution area of the object to be measured from the set normal measurement area; a following-type measurement area setting device for setting at least one following-type measurement area which includes the detected receiving-light signal distribution area and is narrower than the normal measurement area; a displacement measuring device for measuring a target displacement by measuring the following-type measurement area; and an output device for outputting the measured displacement.

    [0007] EP 1 167 918 A1 discloses a visual displacement sensor which comprises a laser diode for impinging a line beam onto an object to be measured at a prescribed angle, a two-dimensional CCD for monitoring the object to be measured, on which the line beam is impinged, from a different angle, measurement object range defining means for defining one or more than one measurement object range within a field of view of the two-dimensional CCD, measurement point coordinate determining means for determining one or more than one measurement point coordinate contained in the defined measurement object range according to an image captured by the two-dimensional CCD, and displacement measuring means for measuring a desired displacement according to the determined one or more than one measurement point coordinate.

    [0008] EP 2 010 863 B1 discloses a scanning probe for capturing data from a plurality of points on the surface of an object by irradiating the object with a light stripe and detecting light reflected from the object surface, the scanning probe comprising (a) stripe generating means for generating and emitting a light stripe; (b) a camera comprising an imaging sensor having an array of pixels to detect the light stripe reflected from the object surface; (c) means for adjusting the intensity of the light stripe during acquisition of the frame, in dependence upon the intensities detected by the camera. It also relates to a means to modify the stripe length, a scanner with separate compartment for the processing means, and an attachable dust cover for a scanner.

    SUMMARY



    [0009] In the workpiece as described above, reflected light is not always stably received from all the measurement positions. For example, as indicated by a waveform 911 in FIG. 22, when a received light amount with respect to light reflected by a first measurement target surface is small and is equal to or smaller than a surface detection threshold value, the displacement measuring device processes light reflected by a second measurement target surface, which is indicated by a waveform 912, as the light reflected by the first measurement target surface. Specifically, the displacement measuring device processes a distance to the first measurement target surface as a distance L912 instead of a distance L911.

    [0010] Further, in the case in which there is reflected light from many positions, the measurement target surface may deviate from a measurement range due to minute positional displacement of a workpiece. For example, as illustrated in FIG. 23, when the first measurement target surface deviates from a measurement range, the displacement measuring device processes the light reflected by the second measurement target surface, which is indicated by a waveform 922, as the light reflected by the first measurement target surface. Specifically, the displacement measuring device processes a distance to the first measurement target surface as a distance L922.

    [0011] In addition, when the measurement is repeated by sequentially shifting a relative position between the sensor head and the workpiece, the positions of the waveforms 912 and 922 may vary in a direction of a horizontal axis in FIGs. 22 and 23.

    [0012] Therefore, with respect to the workpiece as described above, the distance to each measurement target surface may not be accurately measured. Accordingly, it is required to accurately measure the distance to the measurement target surface in various workpieces including such a workpiece.

    [0013] An aspect of the disclosure is to provide a displacement measuring device, a system, and a displacement measuring method capable of accurately measuring a distance to a measurement target surface.

    [0014] According to one aspect of the present invention, a displacement measuring device is provided as set forth in claim 1.

    [0015] According to another aspect of the present invention, a displacement measuring method is provided as set forth in claim 17.

    [0016] Preferred embodiments of the present invention may be gathered from the dependent claims.

    [0017] According to the above-described configuration, it is possible to accurately measuring a distance to each measurement target surface according to one or more embodiments.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0018] 

    FIG. 1 is a diagram illustrating a configuration of a measuring system according to an embodiment.

    FIG. 2 is a diagram illustrating a setting range of each measurement target surface.

    FIG. 3 is a diagram illustrating an i-th measurement value in one situation.

    FIG. 4 is a diagram illustrating an i-th measurement value in a different situation from FIG. 3.

    FIG. 5 is a diagram illustrating an i-th measurement value in a different situation from FIG. 3 and FIG. 4.

    FIG. 6 is a diagram illustrating a change in the setting range.

    FIG. 7 is a diagram illustrating a case in which a sensor controller cannot acquire a measurement value.

    FIG. 8 is a diagram illustrating a case in which setting ranges overlap due to the change in the setting range.

    FIG. 9 is a diagram illustrating a case in which a plurality of measurement target surfaces is detected within one setting range.

    FIG. 10 is a diagram illustrating a method of setting a setting range.

    FIG. 11 is a diagram illustrating a case in which a measurement value is not within a setting range.

    FIG. 12 is a diagram illustrating the method of setting the setting range.

    FIG. 13 is a diagram illustrating a functional configuration of the measuring system.

    FIG. 14 is a flowchart illustrating a flow of processing at initial setting.

    FIG. 15 is a flowchart illustrating a flow of measurement processing performed after the initial setting is completed.

    FIG. 16 is a diagram illustrating a screen displayed at the time of initial setting.

    FIG. 17 is a diagram illustrating a screen of a measurement instance at which measurement is performed normally.

    FIG. 18 is a diagram illustrating a screen of a measurement instance when setting ranges overlap.

    FIG. 19 is a diagram illustrating a screen of a measurement instance when it is determined by a sensor controller that a measurement target surface is not present.

    FIG. 20 is a diagram illustrating a screen of a measurement instance when it is determined by a sensor controller that there is a setting range in which a measurement value is not present.

    FIG. 21 is a diagram illustrating automatic setting of a setting width.

    FIG. 22 is a diagram illustrating a waveform detected by a displacement sensor.

    FIG. 23 is a diagram illustrating another waveform detected by the displacement sensor.


    DESCRIPTION OF THE EMBODIMENTS



    [0019] Hereinafter, embodiments of the disclosure will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions thereof are also the same. Therefore, detailed description thereof will not be repeated.

    <A. Configuration of system>



    [0020] FIG. 1 is a diagram illustrating a configuration of a measuring system according to the embodiment.

    [0021] Referring to FIG. 1, a measuring system 1 includes a displacement sensor 2 and an information processing device 3. The information processing device 3 is typically a personal computer.

    [0022] The displacement sensor 2 is a sensor using wavelength dispersion. Specifically, the displacement sensor 2 is a displacement measuring device using a white confocal method as a measuring method. The displacement sensor 2 is also referred to as a fiber coaxial displacement sensor. The displacement sensor 2 includes a sensor controller 10, a light guiding part 19, and a sensor head 20. The sensor head 20 includes a confocal optical system. Specifically, the sensor head 20 includes an objective lens and a chromatic aberration unit.

    [0023] The sensor controller 10 generates light (typically, white light) having a preset wavelength spread (wavelength width). This light propagates through the light guiding part 19 and reaches the sensor head 20.

    [0024] In the sensor head 20, the propagated light is focused by the objective lens and irradiates a measurement target 800. Since axial chromatic aberration occurs in irradiation light 700 when the irradiation light 700 passes through the chromatic aberration unit, a focal position of the irradiation light irradiated from the objective lens varies according to each wavelength. Only light of a wavelength focused on the measurement target 800 is incident again on the light guiding part 19.

    [0025] The measurement target 800 has layers 810, 820 and 830 which can allow white light to pass through. For example, each of the layers 810, 820 and 830 is formed on a substrate 840 (base material) which does not allow the white light to pass through.

    [0026] Light 701 of a wavelength focused on a first surface 811 of the measurement target 800, light 702 of a wavelength focused on a second surface 812, light 703 of a wavelength focused on a third surface 813, and light 704 of a wavelength focused on a fourth surface 814 are received as reflected light by the sensor head 20.

    [0027] Further, each of the surfaces 811 to 814 is a measurement target surface. Specifically, the first surface 811 is an upper surface of a first layer 810 and is a surface exposed to the outside. The second surface 812 is an upper surface of a second layer 820 and is in contact with the layer 810 located on a side above thereof. The third surface 813 is an upper surface of a third layer 830 and is in contact with the layer 820 located on a side above thereof. The fourth surface 814 is a surface of the substrate 840 and is in contact with the layer 830 located on a side above thereof.

    [0028] Reflected light received by the sensor head 20 is incident on the sensor controller 10 via the light guiding part 19. The sensor controller 10 calculates a distance from the sensor head 20 to the measurement target 800 on the basis of the reflected light. Specifically, the sensor controller 10 calculates each distance (displacement) from the sensor head 20 to each of the layers 810, 820 and 830 of the measurement target 800 and a distance (displacement) to the substrate 840 on the basis of the reflected light.

    [0029] In the displacement sensor 2, the distance measurement and the movement of the sensor head 20, for example, in a direction of an arrow 600 are repeated. Accordingly, for each of the surfaces 811 to 814, measurement values at a plurality of places along the surface are obtained.

    [0030] Further, the sensor head 20 may not move, and the measurement target 800 may move on a production line. This example can be applied to a system in which the measurement is performed while a relative position between the sensor head 20 and the measurement target 800 changes.

    [0031] The information processing device 3 is connected to the sensor controller 10. Various settings of the sensor controller 10 may be changed by the information processing device 3. Also, the information processing device 3 may display information such as the distance calculated by the sensor controller 10. Various functions of the information processing device 3 will be described later. Further, such setting and display may be performed by the sensor controller 10 alone.

    [0032] Further, since hardware configurations of the sensor controller 10, the sensor head 20 and the light guiding part 19 are the same as those of conventional one, description thereof will not be repeated here.

    <B. Overview of processing >



    [0033] In the measuring system 1, a setting range of each of the surfaces 811 to 814 is specified, and a distance obtained within each setting range is set as a distance to each of the surfaces 811 to 814. Further, the setting range may be a region which defines a position of the measurement target surface (that is, a distance at which an amount of received light is a peak). Hereinafter, a specific example of such a configuration will be described.

    [0034] FIG. 2 is a diagram illustrating the setting range of each of the surfaces 811 to 814.

    [0035] Referring to FIG. 2, a range R1(i) is set as the setting range of the first surface 811. Likewise, a range R2(i) is set as the setting range of the second surface 812. Also, a range R3(i) is set as the setting range of the third surface 813, and a range R4(i) is set as the setting range of the fourth surface 814. Details of a range setting method will be described later.

    [0036] Further, the range R1(i) is a range from a distance L11(i) to a distance L12(i). Likewise, the ranges R2(i), R3(i) and R4(i) are a range from a distance L21(i) to a distance L22(i), a range from a distance L31(i) to a distance L32(i), and a range from a distance L41(i) to a distance L42(i), respectively. The range (measurement range) which can be measured by the displacement sensor 2 is a range from a distance Lmin to Lmax.

    [0037] In the above description, i is an arbitrary natural number of 1 or more. Initial values R1(1), R2(1), R3 (1) and R4 (1) of the ranges R1(i) to R4(i) are set by a user using the information processing device 3. Further, the displacement sensor 2 sequentially changes each of the ranges R1(i), R2(i), R3(i) and R4(i) for each measurement period. That is, when focusing on the range R1(i), R1(i+1) is set (reset) after R1(i), and then R1(i+2) is set (reset). Such change (resetting) of the setting range is performed by a control part 11 (refer to FIG. 13) of the sensor controller 10 forming the displacement sensor 2.

    [0038] Hereinafter, the ranges R1(i), R2(i), R3(i) and R4(i) will be described as the setting ranges used for i-th measurement. Further, since the measurement and the movement of the sensor head 20 are repeatedly performed, an i-th measurement point and a (i+1)-th measurement point are different from each other.

    [0039] FIG. 3 is a diagram illustrating an i-th measurement value in one situation.

    [0040] Referring to FIG. 3, in the sensor controller 10, waveforms 501, 502, 503 and 504 of four wavelengths are detected as waveforms indicating the amount of received reflected light. Distances at which the waveforms 501, 502, 503 and 504 are peaks are distances L1(i), L2(i), L3(i) and L4(i), respectively.

    [0041] The distance L1(i) is included in the range R1(i). Therefore, the sensor controller 10 processes the distance L1(i) as a distance to the first surface 811 of the layer 810. Specifically, the distance L1(i) is defined as a measurement value.

    [0042] Further, the distance L2(i) is included in the range R2(i). Therefore, the sensor controller 10 processes the distance L2(i) as a distance to the second surface 812 of the layer 820. Similarly, the sensor controller 10 processes the distance L3(i) as a distance to the third surface 813 and processes the distance L4(i) as a distance to the fourth surface 814.

    [0043] FIG. 4 is a diagram illustrating an i-th measurement value in a different situation from FIG. 3.

    [0044] Referring to FIG. 4, in the sensor controller 10, waveforms 511, 512, 513 and 514 of four wavelengths are detected as waveforms indicating the amount of received reflected light. For convenience of explanation, peaks of the waveforms 511, 512, 513 and 514 are described as the distances L1(i), L2(i), L3(i) and L4(i), respectively, similarly to FIG. 3.

    [0045] The distance L1(i) at which the received light amount is a peak with respect to the waveform 511 is included in the range R1(i). Therefore, the sensor controller 10 processes the distance L1(i) as a distance to the first surface 811. Similarly, the sensor controller 10 processes the distance L2(i) as a distance to the second surface 812 and also processes the distance L4(i) as a distance to the fourth surface 814.

    [0046] However, the distance L3(i) at which the received light amount is a peak with respect to the waveform 513 is not included in the range R3(i). Therefore, the sensor controller 10 does not process the distance L3(i) as a distance to the third surface 813. The sensor controller 10 processes the distance to the third surface 813 as immeasurable (error processing).

    [0047] As described above, the sensor controller 10 processes a distance of the four calculated distances which is included in a preset numerical range (for example, the distance L1(i) included in the range R1(i)) as the distance to the measurement target surface of a preset layer or the measurement target surface of the substrate 840 (for example, the distance to the first surface 811 of the layer 810) among the layers 810, 820 and 830 and the substrate 840.

    [0048] According to such a configuration, since a distance not included in a numerical range is not processed as a distance to a measurement target surface, it is possible to accurately measure the distance to each of the surfaces 811 to 814.

    [0049] FIG. 5 is a diagram illustrating an i-th measurement value in a different situation from FIG. 3 and FIG. 4.

    [0050] Referring to FIG. 5, in the sensor controller 10, waveforms 521, 522, 523 and 524 of four wavelengths are detected as waveforms indicating the amount of received reflected light. For convenience of explanation, the distances at which the waveforms 522, 523 and 524 are peaks are described as L2(i), L3(i) and L4(i), respectively, similarly to FIG. 3 and FIG. 4.

    [0051] The distance L2(i) at which the received light amount is a peak with respect to the waveform 522 is included in the range R2(i). Therefore, the sensor controller 10 processes the distance L2(i) as the distance to the second surface 812. Similarly, the sensor controller 10 processes the distance L3(i) as the distance to the third surface 813 and also processes the distance L4(i) as the distance to the fourth surface 814.

    [0052] However, as indicated by the waveform 521, since the first surface 811 is located outside the measurement range of the sensor head 20, the sensor controller 10 cannot detect the peak in the received light amount included in the range R1(i). Therefore, the sensor controller 10 processes the distance to the first surface 811 as immeasurable (error processing).

    [0053] As described above, the sensor controller 10 processes a distance of the four calculated distances which is included in a preset numerical range as the distance to the measurement target surface of a preset layer or the measurement target surface of the substrate 840 among the layers 810, 820 and 830 and the substrate 840.

    [0054] According to such a configuration, a distance not included in a numerical range is not processed as a distance to a measurement target surface. Particularly, in the case of FIG. 5, the sensor controller 10 can prevent the distance to the first surface 811 which is the first measurement target surface from being processed as the distance L2(i). Therefore, according to the sensor controller 10, it is possible to accurately measure the distance to each of the surfaces 811 to 814.

    [0055] FIG. 6 is a diagram illustrating a change in the setting range.

    [0056] Referring to FIG. 6, the sensor controller 10 changes the setting range related to the first surface 811 from the range R1(i) to the range R(i+1) on the basis of the distance L1(i) included in the range R1(i). Typically, the sensor controller 10 sets (resets) the range R1(i+1) so that the distance L1(i) is a middle value of the range R1(i+1).

    [0057] Similarly, the sensor controller 10 changes the setting range related to the second surface 812 from the range R2(i) to the range R2(i+1) on the basis of the distance L2(i) included in the range R2(i). Also, the sensor controller 10 changes the setting range related to the third surface 813 from the range R3(i) to the range R3(i+1) and also sets the setting range related to the fourth surface 814 from the range R4(i) to the range R4(i+1).

    [0058] As described above, the displacement sensor makes the setting range related to each of the surfaces 811 to 814 follow each of the distances L1(i) to L4(i) which are the measurement values. Accordingly, the number of times that error processing is performed is reduced as compared with the configuration in which such follow-up adherence processing (setting range re-setting processing) is not performed. Therefore, according to such a configuration, it is possible to accurately measure the distance to each of the surfaces 811 to 814 and it is possible to acquire a lot of data for the distances to the surfaces 811 to 814.

    [0059] Further, in the above-described configuration, an example of the configuration in which measurement is continued even when an error occurs has been described. However, the measuring system 1 may be configured to stop measurement at the time when an error occurs.

    <C. Details of processing>


    (c1. Initial setting)



    [0060] As described above, the ranges R1(1), R2(1), R3(1) and R4(1) which are initial values are set by the user using the information processing device 3. Such initial values are set in a teaching mode. In addition, such setting may also be performed by the sensor controller 10 alone.

    [0061] Further, typically, the sensor controller 10 stores the default value for the numerical range in advance. The default value is changed on the basis of the teaching process, and the changed value is used as the initial value.

    [0062] The sensor controller 10 sets the ranges R1(1), R2(1), R3(1) and R4(1) on the basis of the distance to each of the surfaces 811, 812, 813 and 814 measured at the time of teaching (the distance at a peak in the received light amount) and the width of the setting range input by the user (a difference between an upper limit value and a lower limit value of a setting range). Specifically, the sensor controller 10 determines the range R1(1) so that the distance to the first surface 811 becomes the middle value of the input width. The sensor controller 10 sets the range R2(1) so that the distance to the second surface 812 becomes the middle value of the input width. The ranges R3(1) and R4(1) are also set in the same manner.

    [0063] In the measuring system 1, the width of the setting range may be set for each of the ranges R1(1), R2(1), R3(1) and R4 (1).

    (c2. Processing after start of measurement)



    [0064] At the time of measurement, various situations other than the situations illustrated in FIGS. 3, 4 and 5 may occur. Hereinafter, processing in the case in which a situation other than the above-described situation occurs will be described.

    (1) Case in which measurement value cannot be obtained



    [0065] FIG. 7 is a diagram illustrating a case in which the sensor controller 10 cannot acquire a measurement value.

    [0066] Referring to FIG. 7, when there are no peaks of the received light amount within the measurement range (within the ranges of the distances Lmin to Lmax), the sensor controller 10 determines that no measurement target surfaces are present and processes this as an outside of all setting ranges error. In this case, for this measurement instance, the sensor controller 10 assumes that there is no data indicating the distance to each of the surfaces 811 to 814.

    (2) Case in which setting ranges overlap



    [0067] FIG. 8 is a diagram illustrating a case in which setting ranges overlap due to a change in a setting range.

    [0068] Referring to FIG. 8, in the sensor controller 10, it is assumed that waveforms 541, 542, 543 and 544 of four wavelengths are detected after setting the ranges R1(i) to R4(i). Further, it is assumed that the distances at which the waveforms 541, 542, 543 and 544 are peaks are distances L1(i), L2(i), L3(i) and L4(i), respectively.

    [0069] The distance L1(i) at which the received light amount is a peak with respect to the waveform 541 is included in the range R1(i). Therefore, the sensor controller 10 processes the distance L1(i) as the distance to the first surface 811 of the layer 810. Similarly, the sensor controller 10 processes the distance L2(i) as the distance to the second surface 812.

    [0070] However, the already set range R3(i) and the range R4(i) partially overlap each other. In this case, the sensor controller 10 processes a measurement value included in the overlapping range as an error. In this case, for this measurement instance, the sensor controller 10 assumes that the measurement value (distance L3(i)) of the third surface 813 and the measurement value (distance L4(i)) of the fourth surface 814 are not present.

    (3) Case in which a plurality of measurement target surfaces is detected within one setting range



    [0071] FIG. 9 is a diagram illustrating a case in which a plurality of measurement target surfaces is detected within one setting range.

    [0072] Referring to FIG. 9, in the sensor controller 10, it is assumed that waveforms 551, 552, 553 and 554 of four wavelengths are detected after the ranges R1(i+1) to R4(i+1) are set. Further, it is assumed that the distances at which the waveforms 551, 552, 553 and 554 are peaks are distances L1(i+1), L2(i+1), L3(i+1) and L4(i+1), respectively.

    [0073] The distance L1(i+1) at which the received light amount is a peak with respect to the waveform 551 is included in the range R1(i+1). Therefore, the sensor controller 10 processes the distance L1(i+1) as the distance to the first surface 811 of the layer 810. Similarly, the sensor controller 10 processes the distance L2(i+1) as the distance to the second surface 812.

    [0074] However, the range R3(i+1) includes two peaks of the received light amounts. That is, the sensor controller 10 detects two measurement target surfaces in the range R3(i+1).

    [0075] In this case, the sensor controller 10 sets a range R3(i+2) set after the range R3(i+1) as follows.

    [0076] FIG. 10 is a diagram illustrating a method of setting the range R3(i+2).

    [0077] Referring to FIG. 10, the sensor controller 10 selects one of the distance L3(i+1) and the distance L4(i+1) which is closer to the previous measurement value (distance L3(i)). When a distance between the distance L3(i) and the distance L3(i+1) is d1 and a distance between the distance L3(i) and the distance L4(i+1) is d2 (> d1), the sensor controller 10 selects the distance L3(i+1). In this case, the sensor controller 10 sets the range R3(i+2) so that the distance L3(i+1) becomes a middle value in the next range R3(i+2).

    [0078] As described above, when the distance L3(i+1) and the distance L4(i+1) are included in the range R3(i+1), the sensor controller 10 makes one of the distance L3(i+1) and the distance L4(i+1) closer to the distance L3(i) be a middle value of the changed range R3(i+2).

    [0079] According to such a configuration, it is possible to appropriately set a next range.

    (4) Case in which measurement value is not within setting range



    [0080] FIG. 11 is a diagram illustrating a case in which a measurement value is not within a setting range.

    [0081] Referring to FIG. 11, in the sensor controller 10, it is assumed that waveforms 561, 562, 563 and 564 of four wavelengths are detected after the ranges from R1(i+1) to R4(i+1) are set. Further, it is assumed that the distances at which the waveforms 561, 562, 563 and 564 are peaks are distances L1(i+1), L2(i+1), L3(i+1), and L4(i+1), respectively.

    [0082] The distance L1(i+1) at which the received light amount is a peak with respect to the waveform 561 is included in the range R1(i+1). Therefore, the sensor controller 10 processes the distance L1(i+1) as the distance to the first surface 811 of the layer 810. Similarly, the sensor controller 10 processes the distance L2(i+1) as the distance to the second surface 812 and also processes the distance L3(i+1) as the distance to the third surface 813.

    [0083] However, the distance L4(i+1) at which the received light amount is a peak with respect to the waveform 564 is not included in R4(i+1). Therefore, the sensor controller 10 does not process the distance L4(i+1) as the distance to the fourth surface 814. The sensor controller 10 processes the distance to the fourth surface 814 as immeasurable (error processing).

    [0084] In this case, the sensor controller 10 sets a range R4(i+2) set after the range R4(i+1) as follows.

    [0085] FIG. 12 is a diagram illustrating a method of setting the range R4(i+2).

    [0086] Referring to FIG. 12, the sensor controller 10 calculates the distance L4'(i+1) for determining the range R4(i+2) using the distance L3(i), the distance L3(i+1) and the distance L4(i). The sensor controller 10 does not use the distance L4(i+1) to determine the range R4(i+2).

    [0087] Specifically, the sensor controller 10 calculates the distance L4'(i+1) by the following Equation (1).

    In this way, the sensor controller 10 calculates the distance L4'(i+1) using a relative positional relationship between the two measurement values in the previous measurement. The sensor controller 10 sets the range R4(i+2) so that the distance L4'(i+1) becomes a middle value of the next range R4(i+2).

    [0088] As described above, when the previous measurement values L1(i+1), L2(i+1), L3(i+1), L4(i+1) are not included in the range R4(i+1), the sensor controller 10 changes the setting range for the fourth surface 814 from the range R4(i+1) to the range R4(i+2) on the basis of the distance L4(i), the distance L3(i), and the distance L3(i+1) included in the range R3(i+1).

    [0089] According to such a configuration, the range R4(i+2) can be set accurately compared to the case that the range R4(i+2) is set using the distance L4(i+1) illustrated in FIG. 11.

    [0090] Further, in the above description, L3(i+1) and L3(i) are used to set the range R4(i+2). However, L2(i+1) and L2(i) may be used instead. Alternatively, the sensor controller 10 may use L1(i+1) and L1(i).

    (c3. Functional configuration)



    [0091] FIG. 13 is a diagram illustrating a functional configuration of the measuring system 1.

    [0092] Referring to FIG. 13, as described above, the measuring system 1 includes the displacement sensor 2 and the information processing device 3. The displacement sensor 2 includes the sensor controller 10, the light guiding part 19 and the sensor head 20.

    [0093] The sensor controller 10 includes a control part 11, a light projecting part 12, a light receiving part 13, a display part 14 and a communication interface (IF) part 15. The light receiving part 13 includes a spectroscope 131 and a detector 132.

    [0094] The irradiation light having a preset wavelength spread generated in the light projecting part 12 propagates through the light guiding part 19 and reaches the sensor head 20. The reflected light which is incident again on the sensor head 20 propagates through the light guiding part 19 and is incident toward the light receiving part 13. In the light receiving part 13, the reflected light incident on the spectroscope 131 is separated into each wavelength component, and the intensity of each wavelength component is detected by the detector 132.

    [0095] The control part 11 calculates a distance (displacement) from the sensor head 20 to each of the surfaces 811 to 814 of the measurement target 800 on the basis of detection results of the detector 132. Further, the control part 11 changes (resets) the setting range for each of the surfaces 811 to 814.

    [0096] The display part 14 displays the distance calculated by the control part 11 as a numerical value.

    [0097] Among a plurality of light receiving elements of the light receiving part 13 that forms the detector 132, a light receiving element which receives the reflected light changes in accordance with a shape of the surface of the measurement target 800 with respect to the sensor head 20. Therefore, it is possible to measure a change in distance (displacement) with respect to each of the surfaces 811 to 814 of the measurement target 800 based on the detection result (pixel information) of the plurality of light receiving elements of the detector 132. Accordingly, the shape of each measurement target surface of the measurement target 800 can be measured by the displacement sensor 2.

    [0098] The communication IF part 15 is used for communication with the information processing device 3.

    [0099] The information processing device 3 includes a control part 31, a storage part 32, an input part 33, a display part 34, and a communication IF part 35.

    [0100] The control part 31 controls an operation of the information processing device 3. The control part 31 executes a preset application program based on an operating system stored in the storage part 32. An example of a screen (user interface) displayed on the display part 34 by executing the application program will be described later.

    [0101] The control part 31 receives a user input (input operation) via the input part 33. Further, the control part 31 outputs a screen to the display part 34. The control part 31 communicates with the sensor controller 10 via the communication IF part 35.

    [0102] The information processing device 3 transmits information on a setting width of the setting ranges and a teaching execution command used for the initial setting to the sensor controller 10. The setting width is a value input using the input part 33. Further, for example, the setting width is a value obtained by subtracting L11(i) from L12(i) in the case of the range R1(i) in FIG. 2.

    [0103] Further, the teaching execution command is transmitted from the information processing device 3 to the sensor controller 10 by the user selecting a preset object (hereinafter, referred to as a "teaching button") displayed on the display part 34.

    [0104] The sensor controller 10 transmits a measurement value to the information processing device 3, for example, whenever measurement is performed with respect to the information processing device 3. Further, a measurement value processed as an error is not transmitted to the information processing device 3. Also, in the case of an error, the sensor controller 10 notifies the information processing device 3 of that fact. In addition, the sensor controller 10 notifies the information processing device 3 of a value (distance) in the middle of the setting range whenever the setting range (ranges R1(i) to R4(i)) for each of the surfaces 811 to 814 is changed (reset).

    [0105] The information processing device 3 updates and displays the measurement value (waveform) and the like on the display part 34 based on a variety of received data. The user can see the screen of the display part 34 and thus can check temporal change of the waveform and so on.

    (c4. Control structure)



    [0106] FIG. 14 is a flowchart illustrating a flow of processing at the initial setting.

    [0107] Referring to FIG. 14, in Step S1, the information processing device 3 receives an input operation (user input) for registering the setting width of each of the surfaces 811 to 814. When a setting width is input, in Step S2, the information processing device 3 receives an input operation for the teaching button. Therefore, the information on the setting width is transmitted from the information processing device 3 to the sensor controller 10.

    [0108] In Step S3, the sensor controller 10 stores initial values R1(1), R2(1), R3(1) and R4(1) of the respective setting ranges on the basis of the measurement values (distances) for the surfaces 811 to 814 when teaching is performed and the information of the setting widths of the surfaces 811 to 814 received from the information processing device 3.

    [0109] FIG. 15 is a flowchart illustrating a flow of measurement processing performed after the initial setting is completed.

    [0110] Referring to FIG. 15, in Step S101, the sensor controller 10 calculates the measurement values (distances) on the basis of the positions of each of the surfaces 811 to 814. In Step S102, the sensor controller 10 determines whether or not there are one or more measurement target surfaces on the basis of calculation results. That is, the sensor controller 10 determines whether or not there are one or more measurement values.

    [0111] When it is determined that there are one or more surfaces (YES in Step S102), in Step S103, the sensor controller 10 determines whether or not the setting ranges overlap.

    [0112] When it is determined that there are no surfaces (No in Step S102), in Step S108, the sensor controller 10 performs the error processing for no surface. Specifically, as described with reference to FIG. 7, the sensor controller 10 determines that no measurement target surfaces are present and processes this as an error of deviating from all the setting ranges. Specifically, for this measurement instance, the sensor controller 10 assumes that there is no data indicating a distance to any of the surfaces 811 to 814.

    [0113] When it is determined that the setting ranges do not overlap (YES in Step S103), in Step S104, the sensor controller 10 determines whether or not two or more measurement values are present in each of the setting ranges. That is, the sensor controller 10 determines whether there are zero or only one measurement value included in one setting range.

    [0114] When it is determined that the setting ranges overlap (NO in Step S103), in Step S109, the sensor controller 10 performs the error processing as overlapping of the setting ranges. Specifically, as described with reference to FIG. 8, for this measurement instance, the sensor controller 10 determines that there is no measurement value (in the case of FIG. 3, the distance L3(i) and the distance L4(i)) for each surface included in the overlapping setting ranges.

    [0115] When it is determined that two or more measurement values are not present within each of the setting ranges (YES in Step S104), in Step S105, the sensor controller 10 determines whether or not there is a setting range in which a measurement value is not present.

    [0116] When it is determined that two or more measurement values are not present within each of the setting ranges (NO in Step S104), in Step S110, the sensor controller 10 sets the value closer to the previous measurement position as a middle value of the setting range and sets the setting range for the next measurement instance, as described with reference to FIGS. 9 and 10.

    [0117] When it is determined that a measurement value is present in each of the setting ranges (NO in Step S105), in Step S106, the sensor controller 10 resets each of the setting ranges, for example, as described with reference to FIG. 6.

    [0118] When it is determined that there is a setting range in which a measurement value is not present (YES in Step S105), in Step S111, for the setting range in which a measurement value is not present, the sensor controller 10 changes the setting range using a measurement value in a setting range in which a measurement value is present within a setting range, as described with reference to FIGS. 11 and 12. Further, for the setting range in which a measurement value is present within the setting range, the setting range is also changed by using the measurement value.

    [0119] In Step S107, the sensor controller 10 moves the sensor head 20 to a next measurement position, as indicated by an arrow 600 in FIG. 1.

    <D. User interface>



    [0120] Next, an example of the screen displayed on the display part 34 (refer to FIG. 13) of the information processing device 3 will be described. Further, display of the screen is performed by the control part 31.

    (d1. Setting screen)



    [0121] FIG. 16 is a diagram illustrating a screen displayed at the time of initial setting.

    [0122] Referring to FIG. 16, at least a check box 1610, setting items 1611, 1612, 1613 and 1614, and an object 1621 are displayed on a screen 1600.

    [0123] The check box 1610 is used for determining whether or not to set the measurement target surface. The setting item 1611 is used for inputting the setting width of the first surface 811. The setting item 1612 is used for inputting the setting width of the second surface 812. The setting item 1613 is used for inputting the setting width of the third surface 813. The setting item 1614 is used for inputting the setting width of the fourth surface 814.

    [0124] The object 1621 is an object for the user to instruct execution of teaching.

    (d2. During normal processing)



    [0125] FIG. 17 is a diagram illustrating a screen of a measurement instance at which the measurement is performed normally. Further, FIG. 17 is also a diagram corresponding to the state of FIG. 3.

    [0126] Referring to FIG. 17, the control part 31 displays a screen 1700 at least including marks 1721, 1722, 1723 and 1724, waveforms 501 to 504, and four cross marks 1740.

    [0127] The control part 31 displays an inside of the setting range in a manner different from other ranges. For example, the control part 31 sets a background color within the setting range to a color different from the background color of the other range. Specifically, the control part 31 sets the setting range (ranges R1(i), R2(i), R3(i) and R4(i)) to have a green color and thus makes it different from a white color as the color of the other range.

    [0128] The marks 1721, 1722, 1723 and 1724 serve to visually identify each of four setting regions. The control part 31 moves positions of the marks 1721, 1722, 1723 and 1724 left and right according to a change of the corresponding setting range. Typically, the control part 31 causes the positions of the marks 1721, 1722, 1723 and 1724 to be in the middle of the corresponding setting range.

    [0129] The cross mark 1740 is displayed at peak positions of the waveforms 501 to 504.

    (d3. When setting ranges overlap: NO in Step S103)



    [0130] FIG. 18 is a diagram illustrating a screen of a measurement instance when the setting ranges overlap. Further, FIG. 18 is a diagram corresponding to a state of FIG. 8.

    [0131] Referring to FIG. 18, control part 31 displays a screen 1800 including at least the marks 1721 to 1724, the waveforms 541 to 544, and two cross marks 1740.

    [0132] Regarding a difference from the screen 1700 illustrated in FIG. 17, in the screen 1800, for the setting range R3(i) of the third surface 813 and the setting range R4(i) of the fourth surface 814, no coloration such as green coloring is performed to visually notify the user of the occurrence of overlapping.

    [0133] Further, the control part 31 displays the marks 1723 and 1724 for measurement target surface with overlapping setting ranges in a manner different from the marks 1721 and 1722 for measurement target surface without overlapping. For example, the control part 31 sets the color of the whole of the marks 1723 and 1724 or the color of a part (for example, a frame) of the mark to a color (hereinafter also referred to as a "default color") different from the color of the marks 1721 and 1722.

    [0134] Further, since the measurement value (distance) based on the waveforms 543 and 544 is processed as the error (the measurement value is not determined), the control part 31 does not display the cross mark 1740 on the peaks of the waveforms 543 and 544 to visually notify the user.

    (d3. Measurement target surface is not present: NO in Step S102)



    [0135] FIG. 19 is a diagram illustrating a screen of a measurement instance when it is determined by the sensor controller 10 that the measurement target surface is not present. Further, FIG. 19 is a diagram corresponding to a state of FIG. 7.

    [0136] Referring to FIG. 19, the control part 31 displays a screen 1900 including at least the marks 1721 to 1724. However, the control part 31 display all the setting ranges not in green or the like to notify the user that the peak of each of the waveforms in all the setting ranges is not included.

    [0137] Further, the control part 31 sets each of the marks 1721 to 1724 to have a color different from the default color as described in FIG. 18. Furthermore, as an example, a position of each of the marks 1721 to 1724 is set as a default position.

    (d4. When there is setting range in which measurement value is not present: YES in Step S105)



    [0138] FIG. 20 is a diagram illustrating a screen of a measurement instance when it is determined by a sensor controller 10 that there is a setting range in which a measurement value is not present. Further, FIG. 20 is a diagram corresponding to the stage of FIG. 11.

    [0139] Referring to FIG. 20, the control part 31 displays a screen 2000 including at least the marks 1721 to 1724, the waveforms 561 to 564, and four cross marks 1740.

    [0140] Since it is determined that the setting ranges do not overlap and the measurement target surface is present, the control part 31 displays all the setting ranges in a manner different from the other ranges, as in FIG. 17. However, since the peak of the waveform 564 is out of the range R4(i+1), the control part 31 does not display the cross mark 1740 on the peak of the waveform 564 in the viewpoint of notifying the user that it is out of the range.

    (d5. Summary of errors)



    [0141] Table 1 is a table summarizing the above-described errors.
    Table 1
    Error categoryError occurrence conditionState after error
    Error out of setting range (* uncoverable error) No surface to be measured is detected • Switch all setting range into error state
    Setting rages overlap • Switch overlapping setting ranges into error state
    Received light waveform error (* coverable error) Two or more peaks are detected within one setting range • Delete cross mark of peak
    • Display cross mark at peak position again when surface is detected again within setting range
    There is setting range that no measured value is present • Delete cross mark of peak
    • Display cross mark at peak position again when surface is detected again within setting range


    [0142] Referring to table 1, error categories include an error out of the setting range and a received light waveform error.

    [0143] A first occurrence condition of the error out of the setting range is that no measurement target surface is detected as illustrated in FIG. 7 (NO in Step S102 in FIG. 15). Further, a second occurrence condition of the error out of the setting range is that the setting ranges overlap as illustrated in FIG. 8 (NO in Step S103 of FIG. 15).

    [0144] A first occurrence condition of the received light waveform error is that two or more peaks are detected within one setting range as illustrated in FIG. 9 (NO in Step S104 of FIG. 15). Further, a second occurrence condition of the received light waveform error is that there is a setting range in which the measurement value is not present (NO in Step S105 in FIG. 15).

    [0145] Display contents of the screen in the information processing device 3 corresponding to each of the error occurrence conditions are described in a column of a state after error. These descriptions correspond to FIG. 17, FIG. 18, FIG. 19 and FIG. 20 in order from the top to the bottom.

    [0146] The sensor controller 10 processes the error out of the setting as an unrecoverable error. On the other hand, the sensor controller 10 processes the received light waveform error as a recoverable error.

    [0147] In the received light waveform error, when the measurement is performed again at the same position and the measurement value (the distance of the peak of the waveform) is included in the setting range, there is no problem even if the measurement value is processed as the distance to the measurement target surface, and thus the received light waveform error is classified as the recoverable error.

    [0148] In the error out of the setting range, even if the measurement value is included in the setting range, it is not appropriate to process the measurement value as the distance to the measurement target surface, and thus the error out of the setting range is classified as the unrecoverable error. In the case of the error out of the setting range, the sensor controller 10 moves a position of the sensor head 20 to a next measurement position without performing another measurement.

    <E. Modified example>


    (1) Displacement measuring device



    [0149] In the above description, a displacement measuring device using the white confocal method has been described as the displacement sensor 2. That is, in the above description, an example of a configuration of the displacement measuring device including (i) a light projecting part (light source) which generates light having a preset wavelength spread, (ii) an irradiation part (a part of the sensor head) which irradiates light to a measurement target having a plurality of layers which can allow light to pass through so that the light is focused at different positions on an optical axis for each wavelength, (iii) a light receiving part which receives light of each wavelength focused on and reflected by a measurement target surface of each of the plurality of layers and also detects each wavelength from the received light, and (iv) a control part which calculates a distance to the measurement target (each measurement target surface) for each wavelength on the basis of each detected wavelength has been described as the displacement sensor 2.

    [0150] However, the displacement measuring device is not limited to such a configuration. For example, the above-described processing in the control part 11 may also be applied to a displacement sensor (displacement measuring device) using a triangulation method.

    [0151] In such a displacement sensor using the triangulation method, a part of the light which is diffusely reflected from the measurement target is focused on a lens in the displacement sensor. As a result, an image is formed on a position sensor (imaging element) such as a complementary metal oxide semiconductor (CMOS) in the displacement sensor. When the distance to the measurement target changes, a light receiving position on the position sensor also changes. Therefore, the control part 11 can obtain the distance to the measurement target by specifying the light receiving position on the position sensor.

    [0152] As described above, the displacement measuring device may include (a) a light projecting part which generates light, (b) a head sensor which irradiates light to a measurement target having a plurality of layers allowing light to pass through and also receives light of the irradiated light reflected by a measurement target surface of each of the plurality of layers, and (c) a control part which calculates a distance to each measurement target surface on the basis of the light received by the sensor head, wherein (d) the control part processes a first distance of a plurality of calculated distances which is included in a preset numerical range (for example, a first setting range) as a distance to the measurement target surface of a preset layer (for example, a first layer) of the plurality of layers.

    [0153] Further, in such configurations (c) and (d), in the case of the triangulation method, the control part may be configured to calculate the light receiving position (specifically, a pixel value indicating a pixel position of the position sensor) on the position sensor instead of the distance and also to process a first pixel value of a plurality of calculated pixel values included in the preset numerical range as a pixel value to the measurement target surface of the preset layer of the plurality of layers.

    [0154] Further, in such configurations (c) and (d), in the case of the white confocal method, the control part may be configured to calculate the wavelength of the light instead of the distance and also to process a first wavelength of a plurality of calculated wavelengths included in the preset numerical range as a wavelength to the measurement target surface of the preset layer of the plurality of layers.

    [0155] As described above, the control part may be configured to calculate a value (distance, pixel value, wavelength) indicating the distance. That is, the control part may be configured to process a first value of a plurality of calculated values indicating the distance included in the preset numerical range as a value indicating the distance to the measurement target surface of the preset layer of the plurality of layers.

    (2) Measurement target



    [0156] In the above description, although the measurement target 800 having the plurality of layers 810, 820 and 830 each of which can allow light (typically, white light) to pass through is taken as an example of the measurement target, the measurement target is not limited to such a configuration.

    [0157] For example, the measurement object may have a configuration having only one layer (for example, layer 830). That is, the layer which allows light to pass through may be a single layer.

    [0158] In addition, the measurement target may not have such a layer (a layer which allows light to pass through). A configuration in which only one measurement target surface is measured may be adapted.

    (3) Setting range



    [0159] In the above description, an example of the configuration in which, in the teaching mode, the information processing device 3 or the sensor controller 10 automatically determines the initial values R1(1), R2(1), R3(1) and R4(1) in the ranges R1(i) to R4(i) has been described, but the disclosure is not limited thereto. The user may determine (set) the initial values R1(1), R2(1), R3(1) and R4(1).

    [0160] Further, in the above description, determination processing using the ranges R1(i) to R4(i) with respect to the four measurement target surfaces (the first surface 811, the second surface 812, the third surface 813 and the fourth surface 814) is performed, but the disclosure is not limited thereto. The determination processing using the ranges may be performed with respect to three or less measurement target surfaces on the basis of the user operation. That is, the information processing device 3 or the sensor controller 10 may be configured so that the user can set the setting range of at least one of the surfaces 811 to 814.

    [0161] As described above, the information processing device 3 or the sensor controller 10 may be configured to receive a user input for setting the numerical range corresponding to one or more measurement target surfaces among the plurality of measurement target surfaces in association with the measurement target surface and also to process a value included in the numerical range as a value indicating a distance to the measurement target surface corresponding to the numerical range.

    [0162] For example, the information processing device 3 or the sensor controller 10 may be configured to receive the user input for setting the numerical ranges R1(1) and R2(1) among four initial values R1(1), R2(1), R3(1) and R4(1), to process a value included in R1(1) as a value indicating a distance to the first surface 811 corresponding to the numerical range and also to process a value included in R2(1) as a value indicating a distance to the second surface 812 corresponding to the numerical range. Further, in this case, the distances to the third surface 813 and the fourth surface 814 are set to the values calculated by the information processing device 3 or the sensor controller 10, because there is no range designation.

    (Automatic setting of setting width)



    [0163] In the above description, an example of the configuration in which the user input of the width (setting width) of the setting range is received has been described. However, the sensor controller 10 or the information processing device 3 may automatically calculate an optimum setting width. Hereinafter, such a configuration will be described with reference to FIG. 21. Further, the setting width does not change dynamically, and the same value is used during the measurement.

    [0164] FIG. 21 is a diagram illustrating automatic setting of the setting width. Referring to FIG. 21, the sensor controller 10 detects waveforms 591, 592, 593 and 594 of four wavelengths.

    [0165] In the following, a variable N is the number of surfaces. When N is 0, there is no surface detection. Further, in this example, a maximum value of N is 4. A variable X[n] is a relative distance of each surface (the unit is pixel). Further, the unit may be mm. When calculation is performed with the pixel value, it is necessary to convert it to a mm value eventually. A variable TW[n] is the setting width (edge track width). n is a natural number greater than or equal to 2 and less than or equal to N-1.

    [0166] Here, it is assumed that the peaks of the waveforms 591, 592, 593 and 594 of the four wavelengths are respectively P_ADD[0], P_ADD[1], P_ADD[2] and P_ADD[3]. Further, the unit is a pixel.

    [0167] In this case, the sensor controller 10 sets the setting width of the first surface 811, the setting width of the second surface 812, the setting width of the third surface 813, and the setting width of the fourth surface 814 as follows.

    [0168] 
    1. (a) Setting width of first surface 811=X[0]/4
    2. (b) Setting width of second surface 812=X[1]/4 (when X[0]/4>X[1]/4) X[0]/4 (other than the above)
    3. (c) Setting width of third surface 813=X[2]/4 (when X[1]/4>X[2]/4) X[1]/4 (other than the above)
    4. (d) Setting width of fourth surface 814=X[2]/4


    [0169] In this way, the sensor controller 10 sets the optimum width based on the relative position of each surface.

    [0170] Actually, it is necessary to change Equation for calculating the setting width according to the number of detected surfaces. A flow of the actual processing is as shown in the following procedures (i) to (iii).

    (i) Confirmation of the number N of detected surfaces



    [0171] The sensor controller 10 confirms the number N of detected surfaces. When N = 0, the sensor controller 10 processes it as an error. Further, When N = 1, the sensor controller 10 sets the setting width of the first surface 811 to the default value.

    (ii) Calculation of relative distance of each surface (when two or more surfaces are detected)



    [0172] The sensor controller 10 performs a calculation indicated by the following Equation (2).



    [0173] Further, n is a value from 0 to N-2. Equation (1) is an expression for calculating an absolute value of a difference between adjacent values.

    [0174] (iii) Automatic calculation of setting width (when two or more surfaces are detected)

    [0175] Regarding the setting width of an end surface, the sensor controller 10 calculates it on the basis of the following Equations (3) and (4).





    [0176] Regarding the setting width of an intermediate surface, the sensor controller 10 calculates it on the basis of the following Equations (5) and (6). Further, the intermediate surface is present when three or more surfaces are detected. For example, when four surfaces are detected, a second surface and a third surface correspond to the intermediate surfaces. When N = 2, processing according to the following Equations (5) and (6) is unnecessary.






    Claims

    1. A displacement measuring device (2), comprising:

    a light projecting part (12) configured to generate light (700);

    a sensor head (20) configured to irradiate a measurement target (800) with the light (700) and to receive light reflected by a measurement target (800) surface of the measurement target (800) from the irradiated light (700); and

    a control part (11) configured to calculate a value (L1(i), L2(i), L3(i), L4(i)) indicating a distance (L1(i), L2(i), L3(i), L4(i)) to the measurement target surface (811, 812, 813, 814) on the basis of the light received by the sensor head (20),

    wherein the control part (11) is configured to process the calculated value (L1(i), L2(i), L3(i), L4(i)) as the value (L1(i), L2(i), L3(i), L4(i)) indicating the distance (L1(i), L2(i), L3(i), L4(i)) to the measurement target surface (811, 812, 813, 814) on condition that the calculated value (L1(i), L2(i), L3(i), L4(i)) is included in a preset numerical range (R1(i), R2(i), R3(i), R4(i)), wherein the displacement measuring device is characterized in that the control part is further configured to reset the preset numerical range (R1(i), R2(i), R3(i), R4(i)) to a new numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)) such that a width of the preset numerical range (R1(i), R2(i), R3(i), R4(i)) and a width of the new numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)) are equal, and the calculated value (L1(i), L2(i), L3(i), L4(i)) is a middle value of the new numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)).


     
    2. The displacement measuring device (2) according to claim 1,
    wherein the measurement target (800) includes a first layer (810) on a base material (840), and the first layer (810) is capable of allowing the light (700) to pass through,
    wherein the sensor head (20) is configured to receive light reflected by each of a measurement target surface (811, 812, 813, 814) of the base material (840) and a measurement target surface (811) of the first layer (810) from the irradiated light (700), and
    wherein the control part (11) is configured to calculate a value (L1(i), L2(i), L3(i), L4(i)) indicating a distance (L1(i), L2(i), L3(i), L4(i)) to each of the measurement target surfaces (811, 812, 813, 814) on the basis of the light received by the sensor head (20) and to process a first value (L1(i)) of the calculated values (L1(i), L2(i), L3(i), L4(i)), which is included in a first numerical range (R1(i)) as the preset numerical range (R1(i)), as a value (L1(i)) indicating a distance (L1(i)) to the measurement target surface (811) of the first layer (810).
     
    3. The displacement measuring device (2) according to claim 2, wherein the control part (11) is configured to process a second value (L4(i)) of the calculated values (L1(i), L2(i), L3(i), L4(i)), which is included in a second numerical range (R4(i)) as the preset numerical range (R4(i)) not overlapping the first numerical range (R1(i)), as a value (L4(i)) indicating a distance (L4(i)) to the measurement target surface (814) of the base material (840).
     
    4. The displacement measuring device (2) according to claim 2,
    wherein the measurement target (800) has a second layer (820) stacked on the first layer (810),
    wherein the sensor head (20) is further configured to receive light which is reflected by a measurement target surface (812) of the second layer (820) from the irradiated light (700), and
    wherein the control part (11) is configured to process a second value (L2(i)) of the calculated values (L1(i), L2(i), L3(i), L4(i)), which is included in a second numerical range (R2(i)) as the preset numerical range (R2(i)) not overlapping the first numerical range (R1(i)), as a value (L2(i)) indicating a distance (L2(i)) to the measurement target surface (812) of the second layer (820).
     
    5. The displacement measuring device (2) according to claim 1, wherein, when a relative position between the sensor head (20) and the measurement target (800) changes due to movement of the sensor head (20) or the measurement target (800),the control part (11) is configured to recalculate the value (L1(i+1), L2(i+1), L3(i+1), L4(i+1)) indicating the distance (L1(i+1), L2(i+1), L3(i+1), L4(i+1)) to the measurement target surface (811, 812, 813, 814) on the basis of the light received by the sensor head (20) after the relative position is changed, and to process a value (L1(i+1), L2(i+1), L3(i+1), L4(i+1)) of the recalculated values (L1(i+1), L2(i+1), L3(i+1), L4(i+1)), which is included in the numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)) after resetting, as a distance (L1(i+1), L2(i+1), L3(i+1), L4(i+1)) to the measurement target surface (811, 812, 813, 814) at a position after the relative position is changed.
     
    6. The displacement measuring device (2) according to claim 3 or 4, wherein, when a relative position between the sensor head (20) and the measurement target (800) changes due to movement of the sensor head (20) or the measurement target (800),the control part (11) is configured to recalculate the value (L1(i+1), L2(i+1), L3(i+1), L4(i+1)) indicating the distance (L1(i+1), L2(i+1), L3(i+1), L4(i+1)) to each of the measurement target surfaces (811, 812, 813, 814) on the basis of the light received by the sensor head (20) after the relative position is changed. and to process a third value (L1(i+1)) of the recalculated values (L1(i+1), L1(i+2), L1(i+3), L1(i+4)), which is included in the first numerical range (R1(i+1)) after resetting, as a distance (L1(i)) to the measurement target surface (811) of the first layer (810) at a position after the relative position is changed.
     
    7. The displacement measuring device (2) according to claim 5 or 6, wherein the displacement measuring device (2) is configured to change the relative position by moving the sensor head (20) in a direction (600) perpendicular to an optical axis.
     
    8. The displacement measuring device (2) according to claim 6, wherein, when the third value (L3(i+1)) and a fourth value (L4(i+1)) are included in the first numerical range (R3(i+1)) after the resetting, the control part (11) is configured to further change the first numerical range (R3(i+1)) after the resetting so that one of the third value (L3(i+1)) and the fourth value (L4(i+1)) closer to the first value (L3(i)) becomes the middle value of the first numerical range (R3(i+2)) after once more resetting.
     
    9. The displacement measuring device (2) according to claim 6, wherein the control part (11) is configured to reset the second numerical range (R3(i)) on the basis of the second value (L3(i)) included in the second numerical range (R3(i)) and then reset again the first numerical range (R4(i+1)) on the basis of the first value (L4(i)), the second value (L3(i)) and a fifth value (L3(i+1)) included in the second numerical range (R3(i+1)) after the resetting when the recalculated values ((L1(i+1), (L2(i+1), L3(i+1), L4(i+1)) are not included in the first numerical range (R4(i+1)) after the resetting.
     
    10. The displacement measuring device (2) according to claim 1,
    wherein the sensor head (20) is configured to receive light reflected by each of measurement target surfaces (811, 812, 813, 814) of the measurement target (800), and
    wherein the control part (11) is configured to receive a user input configured to specify a numerical range (R1(i), R2(i), R3(i), R4(i)) corresponding to one or more of the measurement target surfaces (811, 812, 813, 814) in association with the measurement target surface (811, 812, 813, 814), to calculate a value indicating a distance (L1(i), L2(i), L3(i), L4(i)) to each of the measurement target surfaces (811, 812, 813, 814) on the basis of the light received by the sensor head (20), and to process the value (L1(i), L2(i), L3(i), L4(i)) included in the numerical range (R1(i), R2(i), R3(i), R4(i)) as a value (L1(i), L2(i), L3(i), L4(i)) indicating a distance (L1(i), L2(i), L3(i), L4(i)) to the measurement target surface (811, 812, 813, 814) corresponding to the numerical range (R1(i), R2(i), R3(i), R4(i)).
     
    11. The displacement measuring device (2) according to any one of claims 1 to 10, wherein a default value of the preset numerical range (R1(i), R2(i), R3(i), R4(i)) is stored, and the default value is changed on the basis of a teaching process.
     
    12. The displacement measuring device (2) according to any one of claims 1 to 11, wherein the control part (11) is configured to reset the numerical range (R1(i), R2(i), R3(i), R4(i)) in a first operation mode and to not reset the numerical range (R1(i), R2(i), R3(i), R4(i)) in a second operation mode.
     
    13. The displacement measuring device (2) according to claim 3 or 4, wherein the control part (11) is configured to determine a width of the first numerical range (R1(i)) and a width of the second numerical range (R2(i)) on the basis of the first value (L1(i)) and the second value (L2(i)).
     
    14. A measuring system (1) which comprises the displacement measuring device (2) according to any one of claims 1 to 13 and an information processing device (3) capable of communicating with the displacement measuring device (2),
    wherein the information processing device (3) is configured to display with a graph an amount of light received by a light receiving part of the displacement measuring device (2) in association with a distance (L1(i), L2(i), L3(i), L4(i)) from the sensor head (20), and to change a display mode of the preset numerical range (R1(i), R2(i), R3(i), R4(i)) in the displayed graph from a default mode to a preset mode.
     
    15. The measuring system (1) according to claim 14, wherein the information processing device (3) is configured to make a graph display mode different between a case in which the value (L1(i), L2(i), L3(i), L4(i)) is not included in the preset numerical range (R1(i), R2(i), R3(i), R4(i)) and a case in which the value (L1(i), L2(i), L3(i), L4(i)) is included in the preset numerical range (R1(i), R2(i), R3(i), R4(i)).
     
    16. The measuring system (1) according to claim 14 or 15, wherein the information processing device (3) is configured to add a mark (1721, 1722, 1723, 1724) indicating that the preset numerical range (R1(i), R2(i), R3(i), R4(i)) in the displayed graph is the preset numerical range (R1(i), R2(i), R3(i), R4(i)).
     
    17. A displacement measuring method comprising steps as follow:

    generating light (700);

    irradiating a measurement target (800) with the light (700);

    receiving light reflected by a measurement target surface (811, 812, 813, 814) of the measurement target (800) from the irradiated light (700);

    calculating a value indicating a distance (L1(i), L2(i), L3(i), L4(i)) to the measurement target surface (811, 812, 813, 814) on the basis of the received light; and

    processing the calculated value(L1(i), L2(i), L3(i), L4(i)) as a value (L1(i), L2(i), L3(i), L4(i)) indicating the distance (L1(i), L2(i), L3(i), L4(i)) to the measurement target surface (811, 812, 813, 814) on condition that the calculated value (L1(i), L2(i), L3(i), L4(i)) is included in a preset numerical range (R1(i), R2(i), R3(i), R4(i)), characterized by resetting the numerical range (R1(i), R2(i), R3(i), R4(i)) to a new numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)), such that a width of the preset numerical range (R1(i), R2(i), R3(i), R4(i)) and a width of the new numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)) are equal, and the calculated value (L1(i), L2(i), L3(i), L4(i)) is a middle value of the new numerical range (R1(i+1), R2(i+1), R3(i+1), R4(i+1)).


     


    Ansprüche

    1. Verschiebungsmessvorrichtung (2), umfassend:

    einen Lichtprojektionsteil (12), der konfiguriert ist, um Licht (700) zu erzeugen;

    einen Sensorkopf (20), der konfiguriert ist, um ein Messziel (800) mit dem Licht (700) zu bestrahlen und um von einer Oberfläche des Messziels (800) reflektiertes Licht von dem eingestrahlten Licht (700) zu empfangen; und

    einen Steuerteil (11), der einen Wert (L1 (i), L2 (i), L3 (i), L4 (i)) berechnet, der einen Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zur Oberfläche des Messziels (811, 812, 813, 814) angibt, auf der Basis des vom Sensorkopf (20) empfangenen Lichts, wobei der Steuerteil (11) konfiguriert ist, um den berechneten Wert (L1 (i), L2 (i), L3 (i), L4 (i)) als den Wert (L1 (i), L2 (i), L3 (i), L4 (i)) zu verarbeiten, der den Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zur Oberfläche des Messziels (811, 812, 813, 814) angibt, unter der Bedingung, dass der berechnete Wert (L1 (i), L2 (i), L3 (i), L4 (i)) in einem voreingestellten numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) enthalten ist, wobei die Verschiebungsmessvorrichtung dadurch gekennzeichnet ist, dass der Steuerteil ferner konfiguriert ist, um den voreingestellten numerischen Bereich (R1 (i), R2 (i); R3 (i), R4 (i)) auf einen neuen numerischen Bereich (R1 (i+1), R2 (i+1); R3 (i+1), R4 (i+1)) zurückzusetzen, so dass eine Breite des voreingestellten numerischen Bereichs (R1 (i), R2 (i); R3 (i), R4 (i)) und eine Breite des neuen numerischen Bereichs (R1 (i+1), R2 (i+1); R3 (i+1), R4 (i+1)) gleich sind und dass der berechnete Wert (L1 (i), L2 (i), L3 (i), L4 (i)) ein mittlerer Wert des neuen numerischen Bereichs (R1 (i+1), R2 (i+1); R3 (i+1), R4 (i+1)) ist.


     
    2. Verschiebungsmessvorrichtung (2) gemäß Anspruch 1, wobei
    das Messziel (800) eine erste Schicht (810) auf einem Grundmaterial (840) enthält und die erste Schicht (810) dazu in der Lage ist das Licht (700) durchzulassen, wobei der Sensorkopf (20) konfiguriert ist, um Licht, das jeweils von einer Oberfläche des Messziels (811, 812, 813, 814) des Grundmaterials (840) und einer Oberfläche des Messziels (811) der ersten Schicht (810) reflektiert wird, von dem eingestrahlten Licht (700), zu empfangen, und
    wobei der Steuerteil (11) konfiguriert ist, um einen Wert (L1 (i), L2 (i), L3 (i), L4 (i)) zu berechnen, der einen Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zu jeder der Oberflächen des Messziels (811, 812, 813, 814) angibt, auf der Basis des vom Sensorkopf (20) empfangenen Lichts und, um einen ersten Wert (L1 (i)) der berechneten Werte (L1 (i), L2 (i), L3 (i), L4 (i)) zu verarbeiten, der in einem ersten numerischen Bereich (R1 (i)) als der voreingestellte numerische Bereich (R1 (i)) enthalten ist, als einen Wert (L1 (i)), der einen Abstand (L1 (i)) zu der Oberfläche des Messziels (811) der ersten Schicht (810) angibt.
     
    3. Verschiebungsmessvorrichtung (2) gemäß Anspruch 2, wobei der Steuerteil (11) konfiguriert ist, um einen zweiten Wert (L4 (i)) der berechneten Werte (L1 (i), L2 (i), L3 (i), L4 (i)) zu verarbeiten, der in einem zweiten numerischen Bereich (R4 (i)) als der voreingestellte numerische Bereich (R4 (i)) enthalten ist, der den ersten numerischen Bereich (R1 (i)) nicht überlappt, als ein Wert (L4 (i)), der einen Abstand (L4 (i)) zur Oberfläche des Messziels (814) des Grundmaterials (840) angibt.
     
    4. Verschiebungsmessvorrichtung (2) gemäß Anspruch 2,
    wobei das Messziel (800) eine zweite Schicht (820) aufweist, die auf die erste Schicht (810) gestapelt ist,
    wobei der Sensorkopf (20) ferner konfiguriert ist, um Licht, das von einer Oberfläche des Messziels (812) der zweiten Schicht (820) von dem eingestrahlten Licht (700) reflektiert wird, zu empfangen und
    wobei der Steuerteil (11) konfiguriert ist, um einen zweiten Wert (L2 (i)) der berechneten Werte (L1 (i), L2 (i)), L3 (i), L4 (i)) zu verarbeiten, der in einem zweiten numerischen Bereich (R2 (i)) als der voreingestellte numerische Bereich (R2 (i)) enthalten ist, der den ersten numerischen Bereich (R1 (i)) nicht überlappt, als ein Wert (L2 (i)), der einen Abstand (L2 (i)) zu der Oberfläche des Messziels (812) der zweiten Schicht (820) angibt.
     
    5. Verschiebungsmessvorrichtung (2) gemäß Anspruch 1, wobei, wenn sich eine relative Position zwischen dem Sensorkopf (20) und dem Messziel (800) aufgrund der Bewegung des Sensorkopfs (20) oder des Messziels (800) ändert, der Steuerteil (11) konfiguriert ist, um den Wert (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)), der den Abstand (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)) zur Oberfläche des Messziels (811, 812, 813, 814) angibt, auf der Grundlage des vom Sensorkopf (20) empfangenen Lichts neu zu berechnen, nachdem sich die relative Position geändert hat, und um einen Wert (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)) der neu berechneten Werte (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)) zu verarbeiten, der im numerischen Bereich (R1 (i + 1), R2 (i + 1), R3 (i + 1), R4 (i + 1)) enthalten ist, nach dem Zurücksetzen, als ein Abstand (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)) zur Oberfläche des Messziels (811, 812, 813, 814) an einer Position, nachdem die relative Position geändert wurde.
     
    6. Verschiebungsmessvorrichtung (2) gemäß Anspruch 3 oder 4, wobei, wenn sich eine relative Position zwischen dem Sensorkopf (20) und dem Messziel (800) aufgrund einer Bewegung des Sensorkopfs (20) oder des Messziels (800) ändert, der Steuerteil (11) konfiguriert ist, um den Wert (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)) neu zu berechnen, der den Abstand (L1 (i + 1), L2 (i + 1), L3 (i + 1), L4 (i + 1)) zu jeder der Oberflächen des Messziels (811, 812, 813, 814) angibt, auf der Grundlage des vom Sensorkopf (20) empfangenen Lichts nachdem die relative Position geändert wurde, und um einen dritten Wert (L1 (i + 1)) der neu berechneten Werte (L1 (i + 1), L1 (i + 2), L1 (i + 3), L1 (i) +4)) zu verarbeiten, der nach dem Zurücksetzen im ersten numerischen Bereich (R1 (i + 1)) enthalten ist, als ein Abstand (L1 (i)) zu der Oberfläche des Messziels (811) der ersten Schicht (810) bei einer Position, nachdem die relative Position geändert wurde.
     
    7. Verschiebungsmessvorrichtung (2) gemäß Anspruch 5 oder 6, wobei die Verschiebungsmessvorrichtung (2) konfiguriert ist, um die relative Position zu ändern, durch Bewegen des Sensorkopfs (20) in eine Richtung (600) senkrecht zu einer optischen Achse.
     
    8. Verschiebungsmessvorrichtung (2) gemäß Anspruch 6, wobei, wenn der dritte Wert (L3 (i + 1)) und der vierte Wert (L4 (i + 1)) nach dem Zurücksetzen im ersten numerischen Bereich (R3 (i + 1)) enthalten sind, der Steuerteil (11) konfiguriert ist, um den ersten numerischen Bereich (R3 (i + 1)) nach dem Zurücksetzen weiter zu ändern, so dass einer von dem dritten Wert (L3 (i + 1)) und dem vierten Wert (L4 (i + 1)), der näher am ersten Wert (L3 (i)) ist, der mittlere Wert des ersten numerischen Bereichs (R3 (i + 2)) wird, nach dem erneuten Zurücksetzen.
     
    9. Verschiebungsmessvorrichtung (2) gemäß Anspruch 6, wobei der Steuerteil (11) konfiguriert ist, um den zweiten numerischen Bereich (R3 (i)) auf der Grundlage des zweiten Werts (L3 (i)) zurückzusetzen, der in dem zweiten numerischen Bereich (R3 (i)) enthalten ist, und dann den ersten numerischen Bereich (R4 (i + 1)) auf der Grundlage des ersten Wertes (L4 (i)), des zweiten Wertes (L3 (i)) und eines fünften Wertes (L3 (i + 1)), der im zweiten numerischen Bereich (R3 (i + 1)) nach dem Zurücksetzen enthalten ist, wieder zurückzusetzen, wenn die neu berechneten Werte ((L1 (i + 1), (L2 (i + 1), L3 (i + 1)), L4 (i + 1)) nach dem Zurücksetzen nicht im ersten numerischen Bereich (R4 (i + 1)) enthalten sind.
     
    10. Verschiebungsmessvorrichtung (2) gemäß Anspruch 1,
    wobei der Sensorkopf (20) konfiguriert ist, um Licht zu empfangen, das von jeder der Oberflächen des Messziels (811, 812, 813, 814) des Messziels (800) reflektiert wird, und
    wobei der Steuerteil (11) konfiguriert ist, um eine Benutzereingabe zu empfangen, die konfiguriert ist, um einen numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) zu spezifizieren, der einer oder mehreren der Oberflächen des Messziels (811, 812, 813, 814) entspricht, in Verbindung mit der Oberfläche des Messziels (811, 812, 813, 814), um einen Wert zu berechnen, der einen Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zu jeder der Oberflächen des Messziels (811, 812, 813, 814) angibt, auf der Grundlage des vom Sensorkopf (20) empfangenen Lichts, und um den Wert (L1 (i), L2 (i), L3 (i), L4 (i)) zu verarbeiten, der in dem numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) enthalten ist als Wert (L1 (i), L2 (i), L3 (i), L4 (i)), der einen Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zur Oberfläche des Messziels (811, 812, 813, 814) angibt, entsprechend dem numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)).
     
    11. Verschiebungsmessvorrichtung (2) gemäß einem der Ansprüche 1 bis 10,
    wobei ein Standardwert des voreingestellten numerischen Bereichs (R1 (i), R2 (i), R3 (i), R4 (i)) gespeichert wird, und der Standardwert auf der Grundlage eines Lehrprozesses geändert wird.
     
    12. Verschiebungsmessvorrichtung (2) gemäß einem der Ansprüche 1 bis 11,
    wobei der Steuerteil (11) konfiguriert ist, um den numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) in einem ersten Betriebsmodus zurückzusetzen und um den numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) in einem zweiten Betriebsmodus nicht zurückzusetzen.
     
    13. Verschiebungsmessvorrichtung (2) gemäß Anspruch 3 oder 4, wobei der Steuerteil (11) konfiguriert ist, um eine Breite des ersten numerischen Bereichs (R1 (i)) und eine Breite des zweiten numerischen Bereichs (R2 (i)) auf der Grundlage des ersten Wertes (L1 (i)) und des zweiten Wertes (L2 (i)) zu bestimmen.
     
    14. Messsystem (1), das die Verschiebungsmessvorrichtung (2) gemäß einem der Ansprüche 1 bis 13 und eine Informationsverarbeitungsvorrichtung (3) umfasst, die mit der Verschiebungsmessvorrichtung (2) kommunizieren kann,
    wobei die Informationsverarbeitungsvorrichtung (3) konfiguriert ist, um mit einem Diagramm eine Lichtmenge anzuzeigen, die von einem Lichtempfangsteil der Verschiebungsmessvorrichtung (2) empfangen wird, in Verbindung mit einer Entfernung (L1 (i), L2 (i), L3 (i), L4 (i)) vom Sensorkopf (20), und um einen Anzeigemodus des voreingestellten numerischen Bereichs (R1 (i), R2 (i), R3 (i), R4 (i)) im angezeigten Diagramm von einem Standardmodus in einen voreingestellten Modus zu ändern.
     
    15. Messsystem (1) gemäß Anspruch 14, wobei die Informationsverarbeitungsvorrichtung (3) konfiguriert ist, um einen Diagrammanzeigemodus zu verändern zwischen einem Fall, in dem der Wert (L1 (i), L2 (i), L3 (i), L4 (i)) nicht in dem voreingestellten numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) enthalten ist und einem Fall, in dem der Wert (L1 (i), L2 (i), L3 (i), L4 (i)) in dem voreingestellten numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) enthalten ist.
     
    16. Messsystem (1) gemäß Anspruch 14 oder 15, wobei die Informationsverarbeitungsvorrichtung (3) konfiguriert ist, um eine Markierung (1721, 1722, 1723, 1724) hinzuzufügen, die angibt, dass der voreingestellte numerische Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) in dem angezeigten Diagramm der voreingestellte numerische Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) ist.
     
    17. Verschiebungsmessverfahren, umfassend die folgenden Schritte:

    Erzeugen von Licht (700);

    Bestrahlen eines Messziels (800) mit dem Licht (700);

    Empfangen von Licht, das von einer Oberfläche des Messziels (811, 812, 813, 814) des Messziels (800) von dem bestrahlten Licht (700) reflektiert wird;

    Berechnen eines Wertes, der einen Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zur Oberfläche des Messziels (811, 812, 813, 814) angibt, auf der Grundlage des empfangenen Lichts; und

    Verarbeiten des berechneten Wertes (L1 (i), L2 (i), L3 (i), L4 (i)) als einen Wert (L1 (i), L2 (i), L3 (i), L4 (i)), der den Abstand (L1 (i), L2 (i), L3 (i), L4 (i)) zur Oberfläche des Messziels (811, 812, 813, 814) angibt, unter der Bedingung, dass der berechnete Wert (L1 (i), L2 (i), L3 (i), L4 (i)) in einem voreingestellten numerischen Bereich (R1 (i), R2 (i), R3 (i), R4 (i)) enthalten ist, gekennzeichnet durch

    Zurücksetzen des numerischen Bereichs (R1) (i), R2 (i), R3 (i), R4 (i)) auf einen neuen numerischen Bereich (R1 (i+1), R2 (i+1); R3 (i+1), R4 (i+1)), so dass eine Breite des voreingestellten numerischen Bereichs (R1 (i), R2 (i); R3 (i), R4 (i)) und eine Breite des neuen numerischen Bereichs (R1 (i+1), R2 (i+1); R3 (i+1), R4 (i+1)) gleich sind und dass der berechnete Wert (L1 (i), L2 (i), L3 (i), L4 (i)) ein mittlerer Wert des neuen numerischen Bereichs (R1 (i+1), R2 (i+1); R3 (i+1), R4 (i+1)) ist.


     


    Revendications

    1. Dispositif de mesure de déplacement (2), comprenant:

    une partie de projection de lumière (12) configurée pour générer de la lumière (700);

    une tête de capteur (20) configurée pour irradier une cible de mesure (800) avec la lumière (700) et pour recevoir la lumière réfléchie par une surface de cible de mesure (800) de la cible de mesure (800) de la lumière irradiée (700); et

    une partie de commande (11) configurée pour calculer une valeur (L1(i), L2(i), L3(i), L4(i)) indiquant une distance (L1(i), L2(i), L3(i), L4 (i)) à la surface cible de mesure (811, 812, 813, 814) sur la base de la lumière reçue par la tête de capteur (20), dans laquelle la partie de commande (11) est configurée pour traiter la valeur calculée (L1(i), L2(i), L3(i), L4(i)) comme valeur (L1(i), L2(i), L3(i), L4(i)) indiquant la distance (L1(i), L2(i), L3(i), L4(i)) à la surface cible de mesure (811, 812, 813, 814) à condition que la valeur calculée (L1(i), L2(i), L3(i), L4(i)) soit incluse dans une plage numérique prédéfinie (R1(i), R2(i), R3(i), R4 (i)), dans lequel le dispositif de mesure de déplacement est caractérisé en ce que la partie de commande est en outre configuré pour réinitialiser la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)) à une nouvelle plage numérique (R1(i+1), R2(i+1), R3(i+1), R4(i+1)) telle qu'une largeur de la plage numérique prédéfinie (R1(i)), R2(i), R3(i), R4(i)) et une largeur de la nouvelle plage numérique (R1(i+1), R2(i+1), R3 (i+1), R4(i + 1)) soient égale et la valeur calculée (L1(i), L2(i), L3(i), L4(i)) est une valeur médiane de la nouvelle plage numérique (R1(i+1), R2(i+1), R3(i+1), R4(i+1)).


     
    2. Dispositif de mesure de déplacement (2) selon la revendication 1, dans lequel la cible de mesure (800) comprend une première couche (810) sur un matériau de base (840), et la première couche (810) est capable de laisser passer la lumière (700) pour traverser,
    dans lequel la tête de capteur (20) est configurée pour recevoir la lumière réfléchie par chacune d'une surface cible de mesure (811, 812, 813, 814) du matériau de base (840) et d'une surface cible de mesure (811) de la première couche (810) de la lumière irradiée (700), et dans lequel la partie de commande (11) est configurée pour calculer une valeur (L1(i), L2(i), L3(i), L4(i)) indiquant une distance (L1(i), L2(i), L3(i), L4(i)) à chacune des surfaces cibles de mesure (811, 812, 813, 814) sur la base de la lumière reçue par la tête de capteur (20) et pour traiter une première valeur (L1 (i)) des valeurs calculées (L1(i), L2(i), L3(i), L4(i)), qui est incluse dans une première plage numérique (R1(i)) comme plage numérique prédéfinie (R1(i)), comme une valeur (L1(i)) indiquant une distance (L1(i)) à la surface cible de mesure (811) de la première couche (810).
     
    3. Dispositif de mesure de déplacement (2) selon la revendication 2, dans lequel la partie de commande (11) est configurée pour traiter une deuxième valeur (L4(i)) des valeurs calculées (L1(i), L2(i), L3(i), L4(i)), qui est incluse dans une deuxième plage numérique (R4(i)) en tant que plage numérique prédéfinie (R4 (i)) ne chevauchant pas la première plage numérique (R1 (i)), en tant que valeur (L4 (i)) indiquant une distance (L4(i)) à la surface cible de mesure (814) du matériau de base (840).
     
    4. Dispositif de mesure de déplacement (2) selon la revendication 2, dans lequel la cible de mesure (800) a une seconde couche (820) empilée sur la première couche (810), dans laquelle la tête de capteur (20) est en outre configurée pour recevoir la lumière qui est réfléchie par une surface cible de mesure (812) de la deuxième couche (820) de la lumière irradiée (700), et dans laquelle la partie de commande (11) est configurée pour traiter une deuxième valeur (L2(i)) de la valeur calculée valeurs (L1(i), L2(i), L3(i), L4(i)), qui est incluse dans une deuxième plage numérique (R2(i)) en tant que plage numérique prédéfinie (R2(i)) ne se superposant pas à la première plage numérique (R1(i)), sous la forme d'une valeur (L2(i)) indiquant une distance (L2(i)) à la surface cible de mesure (812) de la deuxième couche (820).
     
    5. Dispositif de mesure de déplacement (2) selon la revendication 1, dans lequel, lorsqu'une position relative entre la tête de capteur (20) et la cible de mesure (800) change en raison du mouvement de la tête de capteur (20) ou de la cible de mesure (800), la partie de commande (11) est configurée pour recalculer la valeur (L1(i+1), L2(i+1), L3 (i+1), L4(i+1)) indiquant la distance (L1(i+1), L2 (i+1), L3(i+1), L4(i+1)) à la surface cible de mesure (811, 812, 813, 814) sur la base de la lumière reçue par la tête de capteur (20) après modification de la position relative, et pour traiter une valeur (L1(i+1), L2(i+1), L3(i+1), L4 (i+1)) des valeurs recalculées (L1(i+l), L2(i+1), L3(i+1), L4(i+1)), qui est inclus dans la plage numérique (RI(i+1), R2(i+1), R3(i+1), R4(i+1)) après réinitialisation, en tant que distance (L1(i +l), L2(i+1), L3(i+1), L4(i+1)) à la surface cible de mesure (811, 812, 813, 814) à une position après la modification de la position relative.
     
    6. Dispositif de mesure de déplacement (2) selon la revendication 3 ou 4, dans lequel, lorsqu'une position relative entre la tête de capteur (20) et la cible de mesure (800) change en raison du mouvement de la tête de capteur (20) ou de la mesure cible (800), la partie de commande (11) est configurée pour recalculer la valeur (L1(i+1), L2 (i+1), L3(i+1), L4(i+1)) indiquant la distance (L1 (i+1), L2 (i+1), L3(i+1), L4(i+1)) à chacune des surfaces cibles de mesure (811, 812, 813, 814) sur la base de la lumière reçue par la tête de capteur (20) après que la position relative a été modifiée, et pour traiter une troisième valeur (L1(i+1)) des valeurs recalculées (L1(i+1), L1(i+2), L1(i+3), L1 (i+4)), qui est inclus dans la première plage numérique (R1(i+1)) après réinitialisation, en tant que distance (L1(i)) à la surface cible de mesure (811) de la première couche (810) à une position après que la position relative a été modifiée.
     
    7. Dispositif de mesure de déplacement (2) selon la revendication 5 ou 6, dans lequel le dispositif de mesure de déplacement (2) est configuré pour changer la position relative en déplaçant la tête de capteur (20) dans une direction (600) perpendiculaire à un axe optique.
     
    8. Dispositif de mesure de déplacement (2) selon la revendication 6, dans lequel, lorsque la troisième valeur (L3(i+1)) et une quatrième valeur (L4(i+1)) sont incluses dans la première plage numérique (R3 (i+1)) après la réinitialisation, la partie de commande (11) est configurée pour modifier davantage la première plage numérique (R3(i+1)) après la réinitialisation de sorte que l'une de la troisième valeur (L3(i+1)) et la quatrième valeur (L4(i+1)) plus proche de la première valeur (L3(i)) devienne la valeur médiane de la première plage numérique (R3 (i+2)) après une nouvelle réinitialisation.
     
    9. Dispositif de mesure de déplacement (2) selon la revendication 6, dans lequel la partie de commande (11) est configurée pour réinitialiser la deuxième plage numérique (R3(i)) sur la base de la deuxième valeur (L3(i)) incluse dans la deuxième plage numérique (R3(i)), puis réinitialiser à nouveau la première plage numérique (R4(i+1)) sur la base de la première valeur (L4(i)), de la deuxième valeur (L3(i)) et une cinquième valeur (L3(i+1)) incluse dans la deuxième plage numérique (R3(i+1)) après la réinitialisation lorsque les valeurs recalculées ((L1(i+1), (L2(i+1), L3(i+1),L4(i+1)) ne sont pas incluses dans la première plage numérique (R4(i+)1 après la réinitialisation.
     
    10. Dispositif de mesure de déplacement (2) selon la revendication 1, dans lequel la tête de capteur (20) est configurée pour recevoir la lumière réfléchie par chacune des surfaces cibles de mesure (811, 812, 813, 814) de la cible de mesure (800), et dans laquelle la partie de commande (11) est configurée pour recevoir une entrée d'utilisateur configurée pour spécifier une plage numérique (R1(i), R2(i), R3(i), R4(i)) correspondant à une ou plusieurs des surfaces cibles de mesure (811, 812, 813, 814) en association avec la surface cible de mesure (811, 812, 813, 814), pour calculer une valeur indiquant une distance (L1(i), L2(i), L3(i), L4 (i)) à chacune des surfaces cibles de mesure (811, 812, 813, 814) sur la base de la lumière reçue par la tête de capteur (20), et pour traiter la valeur (L1(i), L2(i), L3(i), L4(i)) incluse dans la plage numérique (R1(i), R2(i), R3(i), R4(i)) en tant que valeur (L1(i), L2(i), L3(i), L4(i)) indiquant une distance (L1(i), L2(i), L3(i), L4(i)) à la surface cible de mesure (811, 812, 813, 814) correspondant à la plage numérique (R1(i), R2(i), R3(i), R4(i)).
     
    11. Dispositif de mesure de déplacement (2) selon l'une quelconque des revendications 1 à 10, dans lequel une valeur par défaut de la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)) est mémorisée et la valeur par défaut est modifiée sur la base d'un processus d'apprentissage.
     
    12. Dispositif de mesure de déplacement (2) selon l'une quelconque des revendications 1 à 11, dans lequel la partie de commande (11) est configurée pour réinitialiser la plage numérique (R1(i), R2(i), R3(i), R4(i)) dans un premier mode de fonctionnement et pour ne pas réinitialiser la plage numérique (R1(i), R2(i), R3(i), R4(i)) dans un deuxième mode de fonctionnement.
     
    13. Dispositif de mesure de déplacement (2) selon la revendication 3 ou 4, dans lequel la partie de commande (11) est configurée pour déterminer une largeur de la première plage numérique (R1(i)) et une largeur de la deuxième plage numérique (R2(i)) sur la base de la première valeur (L1(i)) et de la deuxième valeur (L2(i)).
     
    14. Système de mesure (1) qui comprend le dispositif de mesure de déplacement (2) selon l'une quelconque des revendications 1 à 13 et un dispositif de traitement d'informations (3) capable de communiquer avec le dispositif de mesure de déplacement (2), dans lequel le dispositif de traitement d'informations (3) est configuré pour afficher avec un graphique une quantité de la lumière reçue par une partie réceptrice de lumière du dispositif de mesure de déplacement (2) en association avec une distance (L1(i), L2(i), L3(i), L4(i)) de la tête de capteur (20), et pour changer un mode d'affichage de la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)) dans le graphique affiché d'un mode par défaut à un mode prédéfini.
     
    15. Système de mesure (1) selon la revendication 14, dans lequel le dispositif de traitement d'informations (3) est configuré pour rendre un mode d'affichage graphique différent entre un cas dans lequel la valeur (L1(i), L2(i), L3(i), L4(i)) n'est pas inclus dans la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)) et un cas dans lequel la valeur (L1(i), L2(i), 103(i), L4(i)) est inclus dans la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)).
     
    16. Système de mesure (1) selon la revendication 14 ou 15, dans lequel le dispositif de traitement d'informations (3) est configuré pour ajouter une marque (1721, 1722, 1723, 1724) indiquant que la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)) dans le graphique affiché est la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)).
     
    17. Procédé de mesure de déplacement comprenant les étapes suivantes consistant à:

    générer de lumière (700);

    irradier une cible de mesure (800) avec la lumière (700); recevoir la lumière réfléchie par une surface cible de mesure (811, 812, 813, 814) de la cible de mesure (800) de la lumière irradiée (700);

    calculer une valeur indiquant une distance (L1(i), L2(i), L3(i), L4(i)) à la surface cible de mesure (811, 812, 813, 814) sur la base de la lumière reçue; et traiter la valeur calculée (L1(i), L2(i), L3(i), L4(i)) en tant que valeur (L1(i), L2(i), L3(i), L4(i)) indiquant la distance (L1(i), L2(i), L3(i), L4(i)) à la surface cible de mesure (811, 812, 813, 814) à condition que la valeur calculée (L1(i), L2(i), L3(i), L4(i)) soit incluse dans une plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)), caractérisé pa la réinitialisation de la plage numérique (R1(i), R2(i), R3(i), R4(i)) sur une nouvelle plage numérique (R1(i+1), R2(i+1), R3(i+1), R4(i+1)), de sorte qu'une largeur de la plage numérique prédéfinie (R1(i), R2(i), R3(i), R4(i)) et une largeur de la nouvelle plage numérique (R1(i+1), R2(i+1), R3(i+1), R4(i+1)) soient égales et la valeur calculée (L1(i), L2(i), L3(i), L4 (i)) est une valeur moyenne de la nouvelle plage numérique (R1(i+1), R2(i+1), R3(i+1), R4(i+1)).


     




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    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description