(19)
(11)EP 2 645 835 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
06.05.2020 Bulletin 2020/19

(21)Application number: 13001520.9

(22)Date of filing:  25.03.2013
(51)Int. Cl.: 
H05K 5/06  (2006.01)
H01C 10/14  (2006.01)
G05G 1/10  (2006.01)
G05G 25/04  (2006.01)

(54)

Electronic apparatus and fixing structure

Elektronische Vorrichtung und Befestigungsstruktur

Appareil électronique et structure de fixation


(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: 28.03.2012 JP 2012073556
11.05.2012 JP 2012109294

(43)Date of publication of application:
02.10.2013 Bulletin 2013/40

(73)Proprietor: JVC Kenwood Corporation
Yokohama-shi, Kanagawa 221-0022 (JP)

(72)Inventor:
  • Miyoshi, Sachiyo
    Yokohama-shi, Kanagawa, 2210022 (JP)

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


(56)References cited: : 
JP-U- H0 414 862
US-A- 5 496 980
  
      
    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



    [0001] The embodiments relate to an electronic device such as a radio device and a fixing structure, and particularly, relate to an electronic apparatus and a fixing structure having an improved waterproof and dustproof property that prevents water and dust from entering through a gap between an insertion member and an opening formed in a receiving member into which the insertion member is inserted.

    [0002] Radio devices as an example of electronic apparatuses include a turn operation member for volume controlling or encoding. The turn operation member has a main body having a side longer than the diameter of an opening formed in a chassis, and a turn operation shaft integrated with the main body. When the turn operation shaft is inserted through the opening from the underside of the chassis, the main body is positioned on the underside of the chassis and the turn operation shaft projects from the chassis. The turn operation shaft is provided with a male screw thread on the peripheral surface thereof. The turn operation shaft is fastened by a nut provided with a female screw thread, so that the turn operation member is fixed to the chassis . For example, JP 4323237 B describes a radio device having the above-mentioned structure.

    [0003] However, water or dust may enter through a gap between the turn operation shaft and the opening if the turn operation shaft is merely fastened by the nut. Therefore, it is required to provide a waterproof and dustproof structure between the chassis and the turn operation shaft in order to prevent the entrance of water and dust into the radio device. For example, JP H11-135189 A and JP 2004-286376 A describe a waterproof and dustproof structure by use of O-rings, and devices having such a structure are in widespread use.

    [0004] US 5 496 980 A discloses a switch knob which has a mobile first part adapted to switch from one connection to another by rotation and a second part fixed to a support of the device on which the knob is mounted by an assembly device and a clamping device. The assembly device comprises two prism-shape members linked by a ring in two parts each including a hinge and is disposed between the second part and the support in a housing of the support provided for this purpose. The top of the prism-shape members faces towards the interior of the housing and their bases outside the housing so that clamping of the clamping device, by applying a force to the bases of the prism-shape members, moves the members towards each other and locks the second part to the support. Movement of the prism-shape members towards each other is facilitated by the hinges of the ring.

    [0005] JP H04 14862 U discloses a waterproof mechanism using an O-ring.

    SUMMARY



    [0006] In general, it is necessary to increase the number of components used in an electronic apparatus in order to achieve a higher waterproof and dustproof effect. On the contrary, it is preferable to prevent an increase of the number of components since it increases production costs and decreases the efficiency of producing the electronic apparatus. Thus, an electronic apparatus and a fixing structure preferably have a waterproof and dustproof property capable of effectively preventing the entrance of water and dust therein while the number of components used in the electronic apparatus and the fixing structure is minimized.

    [0007] It is an object of the embodiments to provide an electronic apparatus and a fixing structure capable of effectively preventing the entrance of water and dust with a small number of components.

    [0008] In accordance with the present invention, an electronic apparatus as set forth in claim 1 is provided. Further embodiments are inter alia disclosed in the dependent claims. In particular, in order to solve the conventional problem, a first aspect of the embodiments provides an electronic apparatus comprising: a receiving member having an opening; an insertion member that is inserted through the opening and provided with a male thread on a peripheral surface thereof; a fastening member that is provided with a female thread on an inner surface thereof threadably engaged with the male thread, fixes the insertion member to the receiving member by engaging the female thread with the male thread, and covers the opening; and a first O-ring positioned between the insertion member and the fastening member surface inclined to the moving direction.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0009] 

    FIG. 1 is a partial cross-sectional view showing an electronic apparatus and a fixing structure according to a first embodiment.

    FIG. 2 is an enlarged partial cross-sectional view of FIG. 1.

    FIG. 3 is a plan view showing the electronic apparatus and the fixing structure according to the first embodiment, from which some components are removed.

    FIG. 4 is a partial cross-sectional view of a different section from FIG. 1 showing the electronic apparatus and the fixing structure according to the first embodiment.

    FIG. 5A is an enlarged partial cross-sectional view of an O-ring 41 and an inclined surface 32 for explaining functions of the electronic apparatus and the fixing structure according to the first embodiment.

    FIG. 5B is an enlarged partial cross-sectional view of an O-ring 42 and an inclined surface 12 for explaining functions of the electronic apparatus and the fixing structure according to the first embodiment.

    FIG. 6 is a perspective view showing a radio device which is the electronic apparatus according to the first and second embodiments.

    FIG. 7 is a partial cross-sectional view showing an electronic apparatus and a fixing structure according to the second embodiment.

    FIG. 8 is a partial cross-sectional view of a different section from FIG. 7 showing the electronic apparatus and the fixing structure according to the second embodiment.

    FIG. 9 is a partial sectional view showing a first configuration example of a packing member 45 shown in FIG. 7 and FIG. 8.

    FIG. 10 is a partial sectional view showing a second configuration example of the packing member 45 shown in FIG. 7 and FIG. 8.

    FIG. 11 is a partial sectional view showing a third configuration example of the packing member 45 shown in FIG. 7 and FIG. 8.


    DETAILED DESCRIPTION


    <First embodiment>



    [0010] An electronic apparatus and a fixing structure according to a first embodiment are explained below with reference to the accompanying drawings. A radio device 100 shown in FIG. 6 is an example of the electronic apparatus according to the first embodiment. The radio device 100 shown in FIG. 6 has two knobs 50v and 50e provided on the upper surface 101t of a case body 101 made of plastic resin.

    [0011] For example, the knob 50v is a receiver volume control, and the knob 50e is an encode dial for selecting transmitted/received frequencies (channels). The knob 50v is attached to a device for volume control described below, and the knob 50e is attached to a device for transmitted/received frequency selection.

    [0012] Note that at least one knob is required in the present embodiment; however, the number of knobs provided is not particularly limited. Hereinafter, the knobs 50v and 50e are collectively referred to as a knob 50.

    [0013] The structure for fixing the device for volume control or for transmitted/received frequency selection to a chassis inside the case body 101 is explained below with reference to FIG. 1 to FIG. 4. This fixing structure has a waterproof and dustproof property.

    [0014] In FIG. 1, a chassis 11 made of metal has a circular opening 11a. A device 21 for volume control or for transmitted/received frequency selection is inserted from the underside (the lower side in FIG. 1) of the chassis 11 through the opening 11a. The device 21 is an example of an insertion member, and the chassis 11 is an example of a receiving member in which the insertion member is inserted.

    [0015] The chassis 11 is provided with an inclined surface 12 at a chamfered edge on the opening 11a side. The inclined surface 12 is inclined in such a manner as to be inversely tapered toward the upper surface (the upper side in FIG. 1) of the chassis 11 from the opening 11a. The chassis 11 is also provided with a flat surface 13 located adjacent to the inclined surface 12 and parallel to the upper surface of the chassis 11.

    [0016] The chassis 11 is provided with a ring-like recess portion 14 recessed in the thickness direction of the chassis 11. The bottom of the recess portion 14 is the flat surface 13. The recess portion 14 serves as a holding section to hold a flange 30b of a nut 30 described below. The circumference of the recess portion 14 is a vertical surface 14a perpendicular to the upper surface of the chassis 11.

    [0017] The corner of the flat surface 13 and the vertical surface 14a in the chassis 11 is provided with a groove 15 recessed downward from the flat surface 13. In the case of manufacturing plural chassis 11 by die-casting, for example, the groove 15 contributes to keeping a predetermined area of the flat surface 13. Thus, it is preferable to provide the groove 15 in the corner of the flat surface 13 and the vertical surface 14a.

    [0018] The device 21 includes a main body 21a that stores a circuit for volume control or for transmitted/received frequency selection, a rotatable turn operation shaft 21b projecting from the main body 21a and inserted through the opening 11a, and a male thread formation member 21c provided on the peripheral surface of the turn operation shaft 21b and fixed to the main body 21a.

    [0019] A male thread is provided on the peripheral surface of the male thread formation member 21c. The male thread is located on the upper side of the male thread formation member 21c within a predetermined area away from the main body 21a. The area where the male thread is formed is defined as a male thread part 23. The turn operation shaft 21b and the male thread formation member 21c are made of metal.

    [0020] An O-ring 41 made of an elastic body such as rubber is placed in the corner of the main body 21a and the male thread formation member 21c. The base portion of the male thread formation member 21c on the main body 21a side has a diameter D1. The portion adjacent to the base portion with the diameter D1 on the opposite side to the main body 21a has a diameter D2 larger than the diameter D1. The portion adjacent to the portion with the diameter D2 toward the tip of the male thread formation member 21c has a diameter D3 smaller than the diameter D2. The boundary between the portion with the diameter D2 and the portion with the diameter D3 has a diameter that gradually decreases from the diameter D2 to the diameter D3.

    [0021] The male thread formation member 21c is provided with the portion with the diameter D2 so that the base portion on the main body 21a side is concave in the diametrical direction of the turn operation shaft 21b. The concave portion serves as a holding section 22 to hold the O-ring 41. Although the concave portion does not completely cover the cross-section of the O-ring 41 in the figures, the concave portion is referred to as the holding section 22 in this embodiment. The holding section 22 prevents the O-ring 41 from moving toward the tip of the male thread formation member 21c. The provision of the holding section 22 is not necessary, but preferable.

    [0022] A circular opening 101ta is provided on the upper surface 101t of the case body 101. The turn operation shaft 21b projects upward from the opening 101ta. The device 21 is fixed to the chassis 11 by the nut 30 made of metal. The knob 50 is attached to the tip of the turn operation shaft 21b. The nut 30 is an example of a fastening member.

    [0023] The nut 30 includes an upper cylindrical part 30a1, a lower cylindrical part 30a2, and a flange 30b located between the upper cylindrical part 30a1 and the lower cylindrical part 30a2 and projecting therefrom. The flange 30b has a flat surface on the chassis 11 side (the underside). A female thread is provided on the inner surface of the upper cylindrical part 30a1. An O-ring 42 made of an elastic body such as rubber is placed in the corner of the underside of the flange 30b and the peripheral surface of the lower cylindrical part 30a2.

    [0024] As shown in the enlarged view of FIG. 2, the corner of the flange 30b and the lower cylindrical part 30a2 is concave in the diametrical direction of the nut 30. This concave portion serves as a holding section 31 to hold the O-ring 42. The holding section 31 prevents the O-ring 42 from being removed from the lower cylindrical part 30a2. The provision of the holding section 31 is not necessary, but preferable.

    [0025] The lower cylindrical part 30a2 is provided with an inclined surface 32 at a chamfered edge on the inner side adjacent to the bottom of the lower cylindrical part 30a2. The inclined surface 32 is inclined in such a manner as to be tapered from the bottom of the lower cylindrical part 30a2 toward the flange 30b (the upper side of the nut 30) to come closer to the device 21.

    [0026] FIG. 3 is a plan view showing the chassis 11 from the tip side of the turn operation shaft 21b in the state in which the nut 30 and the knob 50 are removed from the electronic apparatus shown in FIG. 1. FIG. 1 is a cross-sectional view along the line A-A in FIG. 3, and shows the state in which the nut 30, the knob 50 and the case body 101 (the upper surface 101t) are added in the A-A cross-sectional view.

    [0027] As shown in FIG. 3, the main body 21a has a rectangular shape in a planar view, and has a side longer than the diameter of the opening 11a. Therefore, the upward movement of the device 21 in FIG. 1 is regulated due to part of the main body 21a being located outside the opening 11a of the chassis 11.

    [0028] The nut 30 is mounted on the male thread formation member 21c in the state in which the knob 50 and the case body 101 are not present as shown in FIG. 3. Then, the nut 30 rotates around the male thread formation member 21c so that the female thread formed on the inner surface of the upper cylindrical part 30a1 is threadably engaged with the male thread part 23 of the male thread formation member 21c. Accordingly, the device 21 is fixed to the chassis 11 and fastened by the nut 30.

    [0029] As described above, the chassis 11 is provided with the recess portion 14 recessed in the thickness direction of the chassis 11 (that is, in the moving direction of the nut 30). Once the male thread formation member 21c is fastened by the nut 30, the flange 30b is held in the recess portion 14 as shown in FIG. 1. A gap is provided between the vertical surface 14a and the peripheral surface of the flange 30b. The thickness of the flange 30b is preferably substantially the same as the depth of the recess portion 14 so that the upper surface of the flange 30b is on the same level as the upper surface of the chassis 11.

    [0030] Functions of the O-rings 41 and 42 and the inclined surfaces 12 and 32 in the process of fixing the device 21 to the chassis 11 by the nut 30 will be explained in detail below.

    [0031] FIG. 4 is a cross-sectional view along the line B-B in FIG. 3, and shows the state in which the nut 30, the knob 50 and the case body 101 (the upper surface 101t) are added in the B-B cross-sectional view. As shown in FIG. 3 and FIG. 4, a cutout is provided in the circular cross-section at the tip of the turn operation shaft 21b. The knob 50 is provided with a hollow in which the turn operation shaft 21b is inserted. The hollow has a shape corresponding to the cutout of the turn operation shaft 21b. Therefore, the knob 50 does not rotate around the turn operation shaft 21b independently, but rotates together with the turn operation shaft 21b.

    [0032] The functions of the O-rings 41 and 42 and the inclined surfaces 12 and 32 in the process of fixing the device 21 to the chassis 11 by the nut 30 are explained with reference to FIG. 5A and FIG. 5B. FIG. 5A and FIG. 5B are enlarged partial cross-sectional views of the O-rings 41 and 42 and the inclined surfaces 12 and 32 shown on the right in FIG. 1.

    [0033] As shown in FIG. 5A, as the nut 30 rotates around the male thread formation member 21c and moves downward, the inclined surface 32 inclined to the moving direction of the nut 30 indicated by the arrow comes closer to the O-ring 41.

    [0034] The inclined surface 32 then comes into contact with and presses the O-ring 41 at a position displaced from the top of the circular cross-section of the O-ring 41 in FIG. 5A. Note that the circular cross-section of the O-ring 41 is a cross-section parallel to the moving direction of the nut 30. The bottom of the circular cross-section of the O-ring 41 is in contact with the surface perpendicular to the moving direction of the nut 30. Thus, the surface 32 continuously presses the O-ring 41 at the position displaced from the top of the circular cross-section of the O-ring 41 in association with the downward rotation of the nut 30.

    [0035] As shown in FIG. 5B, as the nut 30 rotates around the turn operation shaft 21b and moves downward, the circular cross-section of the O-ring 42 comes closer to the inclined surface 12 inclined to the moving direction of the nut 30 indicated by the arrow.

    [0036] The O-ring 42 then comes into contact with and presses the inclined surface 12 at a position displaced from the bottom of the circular cross-section of the O-ring 42 in FIG. 5B. The top of the circular cross-section of the O-ring 42 is in contact with the lower surface of the flange 30b perpendicular to the moving direction of the nut 30. Thus, the O-ring 42 continuously presses the inclined surface 12 at the position displaced from the bottom of the circular cross-section of the O-ring 42 in association with the downward rotation of the nut 30.

    [0037] According to the first embodiment as described above, the bottom/the top (a first point) of the circular cross-section of the O-ring 41/the O-ring 42 is pressed against the surface perpendicular to the moving direction of the nut 30. At the same time, the position displaced from the top/the bottom (a second point) of the circular cross-section of the O-ring 41/the O-ring 42 is pressed against the inclined surface 32/the inclined surface 12, so that the O-ring 41/the O-ring 42 is gradually deformed in association with the downward rotation of the nut 30.

    [0038] Therefore, distortion in a plane perpendicular to the moving direction of the nut 30 between the top and the bottom of the circular cross-section is not easily caused even if the O-ring 41/the O-ring 42 is deformed. Accordingly, quite a high waterproof and dustproof effect can be achieved due to the configuration of the first embodiment.

    [0039] However, if it is assumed that the O-ring 41/the O-ring 42 is held and pressed simultaneously by two surfaces on both upper and lower sides perpendicular to the moving direction of the nut 30 in association with the downward rotation of the nut 30, then in such a case, distortion in a plane perpendicular to the moving direction of the nut 30 between the top and the bottom of the circular cross-section would significantly be caused. As a result, a high waterproof and dustproof effect cannot be expected.

    [0040] The first embodiment thus focuses on the shape of the nut 30 so as to achieve a waterproof and dustproof structure capable of effectively preventing the entrance of water and dust only by providing the O-rings 41 and 42. As is clear from the comparison with the structure described in JP 4323237 B that does not have a waterproof and dustproof property, the present embodiment adds only the O-rings 41 and 42 as the components to achieve the waterproof and dustproof structure and therefore can minimize components used in the electronic apparatus. The inventor has verified that the waterproof and dustproof structure according to the first embodiment can exert quite a high waterproof and dustproof effect.

    [0041] It is possible to fix the device 21 to the chassis 11 only by preliminarily attaching the O-ring 41 and the O-ring 42 to the device 21 and the nut 30, respectively, and fastening the male thread part 23 of the device 21 by the nut 30. At the same time, it is possible to achieve a waterproof and dustproof structure by filling the opening 11a with the nut 30 and due to the effects of the O-rings 41 and 42.

    [0042] Therefore, according to the first embodiment, it is possible to significantly improve the efficiency of producing the radio device 100 (the electronic apparatus).

    [0043] In the first embodiment, the flat surface on the underside of the flange 30b in the nut 30 is in direct contact with the flat surface 13 formed in the chassis 11 on the outer side of the flange 30b away from the O-rings 41 and 42. As described above, the chassis 11 and the nut 30 are made of metal, and these metals are in close contact with each other without interposing any non-metallic material such as plastic therebetween. Thus, the device 21 can be tightly fixed to the chassis 11.

    [0044] If a non-metallic material such as plastic is provided between the chassis 11 and the nut 30, the nut 30 tends to be loosened because of time degradation of the non-metallic material. As a result, the waterproof and dustproof effect is decreased. In addition, such a non-metallic material is easily damaged. In view of this, the structure in the first embodiment in which the metal flat surfaces are in direct contact with each other contributes to not only improving the strength of the fixing structure but also maintaining the long-term waterproof and dustproof effect.

    [0045] Even if a relatively high impact is applied to the knob 50 in the radio device 100, damage caused by the applied impact can be minimized due to the strength of the fixing structure, which is an additional effect according to the first embodiment.

    [0046] In the first embodiment, the O-ring 41 is attached to the device 21, and the O-ring 42 is attached to the nut 30. Alternatively, both O-rings 41 and 42 may be attached to the nut 30. Further, the O-ring 42 may be attached to the chassis 11 while the O-ring 41 is attached to the device 21.

    [0047] The fundamental configuration of the electronic apparatus and the fixing structure according to the first embodiment includes at least the O-ring 41 (first O-ring) positioned between the device 21 and the nut 30 and the O-ring 42 (second O-ring) positioned between the nut 30 and chassis 11 in the state in which the device 21 (the insertion member) is fastened by the nut 30 (the fastening member).

    [0048] In addition, in the electronic apparatus and the fixing structure according to the first embodiment, it is preferable to have a configuration in which, when viewing the circular cross-section of the respective O-rings 41 and 42 parallel to the moving direction of the nut 30 at the point of fastening the device 21 by rotating the nut 30, the first point is pressed against the surface perpendicular to the moving direction of the nut 30, and the position displaced from the second point opposite to the first point is pressed against the inclined surface inclined to the moving direction of the nut 30.

    [0049] This configuration in the first embodiment causes little distortion of the O-rings 41 and 42 and thereby exerts quite a high waterproof and dustproof effect.

    [0050] As shown in FIG. 1 and FIG. 4, the configuration in which the O-ring 41 is attached to the device 21 and the O-ring 42 is attached to the nut 30, is preferable since this fundamental configuration can be easily achieved. In this case, it is only required that the nut 30 is provided with the inclined surface 32 (the first inclined surface) that comes into contact with the position displaced from the second point in the O-ring 41, and the chassis 11 is provided with the inclined surface 12 (the second inclined surface) that comes into contact with the position displaced from the second point in the O-ring 42.

    [0051] In order to position the O-rings 41 and 42 properly, the O-ring 41 is placed in the corner of the main body 21a and the turn operation shaft 21b of the device 21, and the O-ring 42 is placed in the corner of the surface of the flange 30b on the chassis 11 side and the peripheral surface of the lower cylindrical part 30a2. In addition, the holding section 22 (the first holding portion) to hold the O-ring 41 and the holding portion 31 (the second holding portion) to hold the O-ring 42 are provided so that the O-rings 41 and 42 are not easily removed.

    [0052] The chassis 11 and the nut 30 are preferably made of metal. It is possible to increase the strength of the fixing structure by bringing the flat surface 13 (the first flat surface) formed in the chassis 11 into direct contact with the second flat surface on the underside of the flange 30b. Accordingly, it is possible to keep the waterproof and dustproof effect for a long period of time.

    [0053] The chassis 11 is provided with the recess portion 14 to hold the flange 30b so that the upper surface of the flange 30b is on the same level as the upper surface of the chassis 11.

    [0054] The above-described configuration of the first embodiment is particularly effective for electronic apparatuses such as the radio device 100 in which the knob 50 projects outward from the case body 101. Since the radio device 100 is intended for not only indoor use but also outdoor use, the radio device 100 may be externally damaged. If the radio device 100 does not have a waterproof and dustproof structure, water and dust can enter easily through the knob 50.

    [0055] It is preferable to use the configuration according to the first embodiment in the radio device 100 since it exerts quite a high waterproof and dustproof effect. The knob 50 projects outward from the case body 101, and tends to be easily damaged by external factors. However, the strong fixing structure according to the first embodiment can prevent external damage on the knob 50. The fixing structure according to the first embodiment is thus applicable to the radio device 100.

    <Second embodiment>



    [0056] An electronic apparatus and a fixing structure according to a second embodiment are explained below with reference to FIG. 7 to FIG. 10. The radio device 100 shown in FIG. 6 is also used as an example of the electronic apparatus according to the second embodiment. In FIG. 7 and FIG. 8, the same components as in FIG. 1 and FIG. 4 are indicated by the same reference numerals, and the explanations thereof are not repeated in this embodiment. FIG. 7 is a cross-sectional view along the line A-A in FIG. 3 as in the case of FIG. 1. FIG. 8 is a cross-sectional view along the line B-B in FIG. 3 as in the case of FIG. 4.

    [0057] As shown in FIG. 7 and FIG. 8, a packing member 45 is provided between the upper surface 101t of the case body 101, and the chassis 11 and the flange 30b. The packing member 45 is placed over the chassis 11 as a receiving member and the flange 30b of the nut 30 as a fastening member.

    [0058] The packing member 45 covers the entire upper surface of the chassis 11 facing the underside of the upper surface 101t of the case body 101 in the radio device 100 shown in FIG. 6. The packing member 45 is provided with an opening 45a through which the device 21 and the upper cylindrical part 30a1 of the nut 30 are inserted. Note that the radio device 100 has two knobs 50, and the packing member 45 is thus provided with two openings 45a.

    [0059] The bottom of the packing member 45 is a flat surface that is in close contact with the upper surfaces of the chassis 11 and the flange 30b. The upper surface of the packing member 45 adjacent to the opening 45a is provided with a ring-like protrusion 45b projecting toward the upper surface 101t of the case body 101. It is preferable to provide the protrusion 45b on the upper surface of the packing member 45 in a position opposed to the flange 30b.

    [0060] The packing member 45 shown in FIG. 7 and FIG. 8 is a first configuration example, and is provided with the protrusion 45b only on the upper surface thereof.

    [0061] FIG. 9 only shows the packing member 45 of the first configuration example. The protrusion 45b in the first configuration example is substantially triangular in cross-section. The packing member 45 is held and pressed by the upper surface 101t of the case body 101, and the chassis 11 and the flange 30b. Therefore, the protrusion 45b substantially triangular in cross-section is crushed as shown in FIG. 7 and FIG. 8.

    [0062] In the example shown in FIG. 7 and FIG. 8, the packing member 45 is held and pressed by the upper surface 101t of the case body 101, and the chassis 11 and flange 30b, as described above. The member by which the packing member 45 is held together with the chassis 11 and the flange 30b is not limited to the case body 101. The packing member 45 may be interposed between the chassis 11 and the flange 30b, and the other member (an arbitrary member) opposed to the chassis 11 and the flange 30b.

    [0063] According to the second embodiment, the waterproof and dustproof effect can be further improved by the packing member 45. In the second embodiment, the flat surface on the underside of the flange 30b of the nut 30 is in direct contact with the flat surface 13 formed in the chassis 11, and the upper flat surface of the flange 30b is in direct contact with the packing member 45. These direct contacts cause friction and therefore the nut 30 is not easily loosened in the second embodiment.

    [0064] FIG. 10 shows a second configuration example of the packing member 45. The packing member 45 in the second configuration example is provided with a ring-like protrusion 45b on the upper surface adjacent to the opening 45a, and provided with a ring-like protrusion 45c on the lower surface adjacent to the opening 45a. The protrusion 45b and the protrusion 45c are provided in opposed positions.

    [0065] FIG. 11 shows a third configuration example of the packing member 45. FIG. 11 is an enlarged partial view of the right part of FIG. 7 and FIG. 8. The packing member 45 in the third configuration example is provided with a protrusion 45d on the upper surface and a protrusion 45e on the lower surface in positions away from the opening 45a, in addition to the protrusions 45b and 45c provided in the same manner as the second configuration example. The protrusion 45d and the protrusion 45e are provided in opposed positions. The protrusions 45b and 45c are located in positions opposed to the flange 30b, and the protrusions 45d and 45e are located in positions opposed to the chassis 11.

    [0066] Although the protrusions 45b to 45e in the first to third configuration examples of the packing member 45 are substantially triangular in cross-section, the shape of these protrusions is not particularly limited. For example, the tipsof the protrusions 45b to 45e may be curved in cross-section to have an arc-like shape.

    [0067] Alternatively, the packing member 45 may be deformed to serve as a torque control member that controls torque when rotating the knob 50, as described in JP 2009-135356 A.

    [0068] In particular, the packing member 45 is provided across the chassis 11 and the flange 30b of the nut 30 as a fastening member, and held by the chassis 11 and the upper surface 101t of the case body 101. The packing member 45 is then pressed against the inner wall of the knob 50 or the turn operation shaft 21b so as to be deformed. In this case, the packing member 45 does not necessarily have a waterproof and dustproof effect.

    [0069] As described above, the electronic apparatus and the fixing structure according to the first and second embodiments can prevent the entrance of water and dust effectively while minimizing the number of components.

    [0070] The present invention is not limited to the first and second embodiments described above, and various modifications and improvements may be made within the scope of the present invention. The fixing structure for fixing the insertion member to the receiving member has been explained as the waterproof and dustproof structure in the first and second embodiments. However, it is apparent that the fixing structure according to the first and second embodiments can prevent the entrance of other liquids such as oil instead of water.

    [0071] The fixing structure according to the first and second embodiment is applicable to other electronic apparatuses such as acoustic consoles other than the radio device 100, and also applicable to purposes other than electronic apparatuses. For example, the fixing structure according to the first and second embodiments may be used for piping of in-vehicle radio devices or shaft fixtures such as oil pipes.

    [0072] The fixing structure may be provided with any other waterproof and dustproof members in order to improve the waterproof and dustproof effect. It is obvious that the present invention is not limited to the configuration in which the waterproof and dustproof structure is achieved only by two O-rings, or only by two O-rings and a packing member.


    Claims

    1. An electronic apparatus comprising:

    a receiving member (11) having an opening (11a);

    an insertion member (21) that is inserted through the opening (11a) and provided with a male thread on a peripheral surface thereof; and

    a fastening member (30) that is provided with a female thread on an inner surface thereof threadably engaged with the male thread, adapted to fix the insertion member (21) to the receiving member (11) by engaging the female thread with the male thread, and adapted to cover the opening (11a);

    characterized in that the electronic apparatus further comprises

    a first O-ring (41) positioned between the insertion member (21) and the fastening member (30) and a second O-ring (42) positioned between the fastening member (30) and the receiving member (11), in a state in which the insertion member (21) is fastened by the fastening member (30),

    wherein, when viewing each circular cross-section of the first and second O-rings (41, 42) along a surface parallel to a moving direction of the fastening member (30) when fastening the insertion member (21) by rotating the fastening member (30), a first point of each circular cross-section is pressed against a surface perpendicular to the moving direction, and

    a position displaced from a second point opposite to the first point of each circular cross-section is pressed against an inclined surface (12, 32) inclined to the moving direction,

    wherein the insertion member (21) is provided with a first holding section (22) that is recessed in a diametrical direction of the insertion member (21) to hold the first O-ring (41), and

    wherein the fastening member (30) is provided with a second holding section (31) that is recessed in a diametrical direction of the fastening member (30) to hold the second O-ring (42).


     
    2. The electronic apparatus according to claim 1, wherein:

    the first O-ring (41) is attached to the insertion member (21) and the second O-ring (42) is attached to the fastening member (30),

    the fastening member (30) is provided with a first inclined surface (32) adapted to come into contact with the position displaced from the second point of the first O-ring(41), and

    the receiving member (11) is provided with a second inclined surface (12) adapted to come into contact with the position displaced from the second point of the second O-ring(42).


     
    3. The electronic apparatus according to claim 2, wherein:

    the insertion member (21) includes a main body (21a) having a side longer than a diameter of the opening (11a), a rotatable turn operation shaft (21b) projecting from the main body (21a) and inserted through the opening(11a), and a male thread formation member (21c) provided with the male thread on a peripheral surface thereof, provided on a peripheral surface of the turn operation shaft (21b) and fixed to the main body (21a),

    the fastening member (30) includes a cylindrical part (30a1, 30a2) and a flange (30b) projecting from the cylindrical part (30a1, 30a2),

    the first O-ring (41) is placed in a corner of the main body (21a) and the male thread formation member (21c),

    the first inclined surface (32) is provided on an inner surface adjacent to a bottom of the cylindrical part (30a2) facing the main body (21a),

    the second O-ring (42) is placed in a corner of a surface of the flange (30b) facing the receiving member (11) and a peripheral surface of the cylindrical part (30a2), and

    the second inclined surface (12) is provided at an edge of the opening (11a) of the receiving member (11).


     
    4. The electronic apparatus according to any one of claim 3, wherein:

    the receiving member (11) and the fastening member (30) are made of metal,

    the receiving member (11) is provided with a first flat surface (13) parallel to a direction perpendicular to the moving direction,

    the surface of the flange (30b) facing the receiving member (11) is a second flat surface opposed to the first flat surface (13), and

    the first flat surface (13) comes into contact with the second flat surface on an outer side of the flange (30b) away from the second O-ring (42).


     
    5. The electronic apparatus according to claims 1 to 4, wherein the receiving member (11) is provided with a recess portion (14) recessed in the moving direction to hold the flange (30b).
     
    6. The electronic apparatus according to claim 3 or 4, wherein:

    the main body (21a) stores a circuit that adjusts the electronic apparatus to a predetermined setting condition, and

    the turn operation shaft (21b) is provided with a knob (50) that rotates the turn operation shaft (21b) to control the predetermined setting condition.


     
    7. The electronic apparatus according to any one of claims 1 to 6 further comprising a packing member (45) bridging over the receiving member (11) and the fastening member (30), and held and pressed by the receiving member (11) and the fastening member (30), and an arbitrary member opposed to the receiving member (11) and the fastening member (30).
     
    8. The electronic apparatus according to claim 7, wherein the packing member (45) is provided with a protrusion (45b) facing and projecting toward the arbitrary member.
     
    9. The electronic apparatus according to claim 8, wherein the protrusion (45b) is formed in a position opposed to the second flat surface.
     


    Ansprüche

    1. Elektronische Vorrichtung, die aufweist:

    ein Aufnahmeelement (11) mit einer Öffnung (11a);

    ein Einführelement (21), das durch die Öffnung (11a) eingeführt wird und mit einem Außengewinde an einer Umfangsfläche davon vorgesehen ist; und

    ein Befestigungselement (30), das mit einem Innengewinde an einer Innenfläche davon vorgesehen ist, das mit dem Außengewinde schraubbar in Eingriff ist, das ausgebildet ist zum Befestigen des Einführelements (21) an dem Aufnahmeelement (11), indem das Innengewinde mit dem Außengewinde in Eingriff gebracht wird, und ausgebildet ist zum Abdecken der Öffnung (11a);

    dadurch gekennzeichnet, dass die elektronische Vorrichtung weiter aufweist einen ersten O-Ring (41), der zwischen dem Einführelement (21) und dem Befestigungselement (30) positioniert ist, und einen zweiten O-Ring (42), der zwischen dem Befestigungselement (30) und dem Aufnahmeelement (11) positioniert ist, in einem Zustand, in dem das Einführelement (21) durch das Befestigungselement (30) befestigt ist,

    wobei, bei Betrachtung jedes kreisförmigen Querschnitts des ersten und zweiten O-Rings (41, 42) entlang einer Oberfläche parallel zu einer Bewegungsrichtung des Befestigungselements (30) bei einem Befestigen des Einführelements (21) durch Rotieren des Befestigungselements (30), ein erster Punkt jedes kreisförmigen Querschnitts gegen eine Oberfläche senkrecht zu der Bewegungsrichtung gedrückt wird, und

    eine Position versetzt von einem zweiten Punkt gegenüber dem ersten Punkt jedes kreisförmigen Querschnitts gegen eine geneigte Oberfläche (12, 32) gedrückt wird, die zu der Bewegungsrichtung geneigt ist,

    wobei das Einführelement (21) mit einem ersten Halteabschnitt (22) vorgesehen ist, der in einer diametralen Richtung des Einführelements (21) ausgespart ist, um den ersten O-Ring (41) zu halten, und

    wobei das Befestigungselement (30) mit einem zweiten Halteabschnitt (31) vorgesehen ist, der in einer diametralen Richtung des Befestigungselements (30) ausgespart ist, um den zweiten O-Ring (42) zu halten.


     
    2. Die elektronische Vorrichtung gemäß Anspruch 1, wobei:

    der erste O-Ring (41) an dem Einführelement (21) angebracht ist und der zweite O-Ring (42) an dem Befestigungselement (30) angebracht ist,

    das Befestigungselement (30) mit einer ersten geneigten Oberfläche (32) vorgesehen ist, die ausgebildet ist, mit der von dem zweiten Punkt des ersten O-Rings (41) versetzten Position in Kontakt zu kommen, und

    das Aufnahmeelement (11) mit einer zweiten geneigten Oberfläche (12) vorgesehen ist, die ausgebildet ist, mit der von dem zweiten Punkt des zweiten O-Rings (42) versetzten Position in Kontakt zu kommen.


     
    3. Die elektronische Vorrichtung gemäß Anspruch 2, wobei:

    das Einführelement (21) einen Hauptkörper (21a) mit einer Seite, die länger als ein Durchmesser der Öffnung (11a) ist, eine rotierbare Drehbetriebswelle (21b), die aus dem Hauptkörper (21a) herausragt und durch die Öffnung (11a) eingeführt ist, und ein Außengewindeformationselement (21c) aufweist, das mit dem Außengewinde an einer Umfangsfläche davon vorgesehen ist, an einer Umfangsfläche der Drehbetriebswelle (21b) vorgesehen und an dem Hauptkörper (21a) befestigt,

    das Befestigungselement (30) einen zylindrischen Teil (30a1, 30a2) und einen Flansch (30b) umfasst, der aus dem zylindrischen Teil (30a1, 30a2) herausragt,

    der erste O-Ring (41) in einer Ecke des Hauptkörpers (21a) und des Außengewindeformationselements (21c) angeordnet ist,

    die erste geneigte Oberfläche (32) auf einer Innenfläche vorgesehen ist, die an einen dem Hauptkörper (21a) zugewandten Boden des zylindrischen Teils (30a2) angrenzt,

    der zweite O-Ring (42) in einer Ecke einer Oberfläche des Flansches (30b) angeordnet ist, die dem Aufnahmeelement (11) und einer Umfangsfläche des zylindrischen Teils (30a2) zugewandt ist, und

    die zweite geneigte Oberfläche (12) an einer Kante der Öffnung (11a) des Aufnahmeelements (11) vorgesehen ist.


     
    4. Die elektronische Vorrichtung gemäß einem von Anspruch 3, wobei:

    das Aufnahmeelement (11) und das Befestigungselement (30) aus Metall bestehen,

    das Aufnahmeelement (11) mit einer ersten ebenen Oberfläche (13) parallel zu einer Richtung senkrecht zu der Bewegungsrichtung vorgesehen ist,

    die dem Aufnahmeelement (11) zugewandte Oberfläche des Flansches (30b) eine zweite ebene Oberfläche gegenüber der ersten ebenen Oberfläche (13) ist, und

    die erste ebene Oberfläche (13) mit der zweiten ebenen Oberfläche auf einer Außenseite des Flansches (30b) entfernt von dem zweiten O-Ring (42) in Kontakt kommt.


     
    5. Die elektronische Vorrichtung gemäß den Ansprüchen 1 bis 4, wobei das Aufnahmeelement (11) mit einem Aussparungsteil (14) vorgesehen ist, der in der Bewegungsrichtung ausgespart ist, um den Flansch (30b) zu halten.
     
    6. Die elektronische Vorrichtung gemäß Anspruch 3 oder 4, wobei:

    der Hauptkörper (21a) eine Schaltung umfasst, die die elektronische Vorrichtung auf einen vorgegebenen Einstellzustand anpasst, und

    die Drehbetriebswelle (21b) mit einem Knopf (50) vorgesehen ist, der die Drehbetriebswelle (21b) rotiert, um den vorgegebenen Einstellzustand zu steuern.


     
    7. Die elektronische Vorrichtung gemäß einem der Ansprüche 1 bis 6, die weiter ein Packungselement (45), das das Aufnahmeelement (11) und das Befestigungselement (30) überbrückt und von dem Aufnahmeelement (11) und dem Befestigungselement (30) gehalten und gedrückt wird, und ein arbiträres Element gegenüber dem Aufnahmeelement (11) und dem Befestigungselement (30) aufweist.
     
    8. Die elektronische Vorrichtung gemäß Anspruch 7, wobei das Packungselement (45) mit einem Vorsprung (45b) vorgesehen ist, der dem arbiträren Element zugewandt ist und zu diesem hin ragt.
     
    9. Die elektronische Vorrichtung gemäß Anspruch 8, wobei der Vorsprung (45b) in einer Position gegenüber der zweiten ebenen Oberfläche ausgebildet ist.
     


    Revendications

    1. Appareil électronique comprenant :

    un élément de réception (11) ayant une ouverture (11a) ;

    un élément d'insertion (21) qui est inséré à travers l'ouverture (11a) et muni d'un filetage mâle sur sa surface périphérique ; et

    un élément de fixation (30) qui est muni d'un filetage femelle sur une surface intérieure de celui-ci engagée par filetage avec le filetage mâle, adapté pour fixer l'élément d'insertion (21) à l'élément de réception (11) en engageant le filetage femelle avec le filetage mâle, et adapté à couvrir l'ouverture (11a) ;

    caractérisé en ce que l'appareil électronique comprend en outre :

    un premier anneau (41) positionné entre l'élément d'insertion (21) et l'élément de fixation (30) et un deuxième anneau (42) positionné entre l'élément de fixation (30) et l'élément de réception (11), dans un état dans lequel l'élément d'insertion (21) est fixé par l'élément de fixation (30),

    dans lequel, en considérant chaque section transversale circulaire des premier et deuxième anneaux (41, 42) le long d'une surface parallèle à une direction de déplacement de l'élément de fixation (30) pendant la fixation de l'élément d'insertion (21) par rotation de l'élément de fixation (30), un premier point de chaque section transversale circulaire est pressé contre une surface perpendiculaire à la direction de déplacement, et

    une position déplacée par rapport à un deuxième point opposé au premier point de chaque section transversale circulaire est pressée contre une surface inclinée (12, 32) inclinée dans la direction de déplacement,

    dans lequel l'élément d'insertion (21) est muni d'une première section de maintien (22) qui est en retrait dans une direction diamétrale de l'élément d'insertion (21) pour maintenir le premier anneau (41), et

    dans lequel l'élément de fixation (30) est muni d'une deuxième section de maintien (31) qui est en retrait dans une direction diamétrale de l'élément de fixation (30) pour maintenir le deuxième anneau (42).


     
    2. Appareil électronique selon la revendication 1, dans lequel :

    le premier anneau (41) est fixé à l'élément d'insertion (21) et le deuxième anneau (42) est fixé à l'élément de fixation (30),

    l'élément de fixation (30) est muni d'une première surface inclinée (32) adaptée à venir en contact avec la position déplacée par rapport au deuxième point du premier anneau (41), et

    l'élément de réception (11) est muni d'une deuxième surface inclinée (12) adaptée à venir en contact avec la position déplacée par rapport au deuxième point du deuxième anneau (42).


     
    3. Appareil électronique selon la revendication 2, dans lequel :

    l'élément d'insertion (21) comporte un corps principal (21a) ayant un côté plus long qu'un diamètre de l'ouverture (11a), un arbre d'opération de rotation rotatif (21b) faisant saillie depuis le corps principal (21a) et inséré à travers l'ouverture (11a), et un élément de formation de filetage mâle (21c) muni du filetage mâle sur une surface périphérique de celui-ci, prévu sur une surface périphérique de l'arbre d'opération de rotation (21b) et fixé au corps principal (21a),

    l'élément de fixation (30) comporte une partie cylindrique (30a1, 30a2) et une bride (30b) faisant saillie depuis la partie cylindrique (30a1, 30a2),

    le premier anneau (41) est placé dans un coin du corps principal (21a) et de l'élément de formation de filetage mâle (21c),

    la première surface inclinée (32) est prévue sur une surface intérieure adjacente à un fond de la partie cylindrique (30a2) faisant face au corps principal (21a),

    le deuxième anneau (42) est placé dans un coin d'une surface de la bride (30b) faisant face à l'élément de réception (11) et une surface périphérique de la partie cylindrique (30a2), et

    la deuxième surface inclinée (12) est prévue au niveau d'un bord de l'ouverture (11a) de l'élément de réception (11).


     
    4. Appareil électronique selon la revendication 3, dans lequel :

    l'élément de réception (11) et l'élément de fixation (30) sont constitués de métal,

    l'élément de réception (11) est muni d'une première surface plate (13) parallèle à une direction perpendiculaire à la direction de déplacement,

    la surface de la bride (30b) faisant face à l'élément de réception (11) est une deuxième surface plate opposée à la première surface plate (13), et

    la première surface plate (13) vient en contact avec la deuxième surface plate sur un côté extérieur de la bride (30b) à distance du deuxième anneau (42).


     
    5. Appareil électronique selon l'une quelconque des revendications 1 à 4, dans lequel l'élément de réception (11) est muni d'une partie évidée (14) évidée dans le sens de déplacement pour maintenir la bride (30b).
     
    6. Appareil électronique selon la revendication 3 ou 4, dans lequel :

    le corps principal (21a) stocke un circuit qui ajuste l'appareil électronique à une condition de réglage prédéterminée, et

    l'arbre d'opération de rotation (21b) est muni d'un bouton (50) qui fait tourner l'arbre d'opération de rotation (21b) pour contrôler la condition de réglage prédéterminée.


     
    7. Appareil électronique selon l'une quelconque des revendications 1 à 6, comprenant en outre un élément d'emballage (45) passant en pont au-dessus de l'élément de réception (11) et de l'élément de fixation (30), et maintenu et pressé par l'élément de réception (11) et l'élément de fixation (30), et un élément arbitraire opposé à l'élément de réception (11) et à l'élément de fixation (30).
     
    8. Appareil électronique selon la revendication 7, dans lequel l'élément d'emballage (45) est muni d'une saillie (45b) faisant face à, et saillie vers, l'élément arbitraire.
     
    9. Appareil électronique selon la revendication 8, dans lequel la saillie (45b) est formée dans une position opposée à la deuxième surface plate.
     




    Drawing



























    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description