(19)
(11)EP 2 655 956 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
29.07.2020 Bulletin 2020/31

(21)Application number: 11804814.9

(22)Date of filing:  09.12.2011
(51)International Patent Classification (IPC): 
F21V 23/00(2015.01)
F21Y 113/00(2016.01)
F21V 3/00(2015.01)
F21Y 101/00(2016.01)
F21W 121/00(2006.01)
F21S 10/00(2006.01)
(86)International application number:
PCT/IB2011/055565
(87)International publication number:
WO 2012/085736 (28.06.2012 Gazette  2012/26)

(54)

LIGHTING DEVICE AND METHOD FOR MANUFACTURING A LIGHTING DEVICE

BELEUCHTUNGSVORRICHTUNG UND VERFAHREN ZUR HERSTELLUNG EINER BELEUCHTUNGSVORRICHTUNG

DISPOSITIF D'ÉCLAIRAGE ET PROCÉDÉ DE FABRICATION DE DISPOSITIF D'ÉCLAIRAGE


(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: 22.12.2010 EP 10196396

(43)Date of publication of application:
30.10.2013 Bulletin 2013/44

(60)Divisional application:
19213280.1 / 3653924

(73)Proprietor: Signify Holding B.V.
5656 AE Eindhoven (NL)

(72)Inventor:
  • KWISTHOUT, Cornelis Wilhelmus
    NL-5656 AE Eindhoven (NL)

(74)Representative: van Eeuwijk, Alexander Henricus Waltherus et al
Signify Netherlands B.V. Intellectual Property High Tech Campus 7
5656 AE Eindhoven
5656 AE Eindhoven (NL)


(56)References cited: : 
WO-A1-03/059012
CN-U- 201 513 800
US-A1- 2006 226 795
WO-A1-2010/110652
US-A1- 2006 152 946
  
      
    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

    FIELD OF THE INVENTION



    [0001] The present invention generally relates to the field of lighting devices.

    BACKGROUND OF THE INVENTION



    [0002] Traditional incandescent light bulbs are available in various designs such as plain functional bulbs with different glass finishes (e.g. transparent, diffuse or colored) and decorative bulbs with complex filaments, wherein the filament itself serves a decorative purpose. However, due to demands on power saving in lighting devices, driven by eco awareness and legislation, traditional incandescent light bulbs are being replaced by more power efficient light sources such as fluorescent lamps and LED (light emitting diode) lamps. Such conventional eco-friendly lamps do not provide the same various designs as traditional incandescent light bulbs.

    [0003] A solution of how to provide a lighting device resembling a carbon filament lamp is disclosed in WO 2006/035349. The document shows a lighting device comprising a solid state light source optically coupled to an optical fiber having an out-coupling surface. A drawback with such a lighting device is that it does not provide a sufficiently energy-efficient functional lighting (such as e.g. general lighting or task lighting).

    SUMMARY OF THE INVENTION



    [0004] Thus, there is a need for providing alternatives and/or new devices that would overcome, or at least alleviate or mitigate, at least some of the above mentioned drawbacks. It is with respect to the above considerations that the present invention has been made. An object of the present invention is to provide an improved alternative to the above mentioned technique and prior art.

    [0005] More specifically, it is an object of the present invention to provide a lighting device enabling both decorative lighting and functional lighting with improved efficiency. It is also an object of the present invention to provide a method of manufacturing such a lighting device.

    [0006] These and other objects of the present invention are achieved by means of a lighting device and a method of manufacturing the lighting device having the features defined in the independent claims. Preferable embodiments of the invention are characterized by the dependent claims.

    [0007] Hence, according to a first aspect of the present invention, a lighting device according to claim 1 is provided.

    [0008] Further, according to a second aspect of the invention, a method of manufacturing a lighting device according to claim 13 is provided.

    [0009] The basic idea of the invention is that the light emitted from the first light emitting element is emitted out of the lighting device via the light guide and the light emitted from the second light emitting element is emitted out of the lighting device directly from the second light emitting element. As a result, decorative lighting is provided by the light guide and the first light emitting element, and a direct functional illumination is provided by the second light emitting element.

    [0010] In this respect, with the term "direct illumination" it is meant that most of, or at least a considerable part of the light emitted from the second light emitting element is emitted from the lighting device without passing a light guide. The inventor has realized that the lighting device according to prior art suffers from energy-losses when the light emitted from the solid state light source is coupled into the optical fiber and then out again. Hence, the lighting device according to prior art may be improved with respect to functional lighting (such as e.g. general lighting or task lighting). Functional lighting may be defined as a type of lighting wherein it is desirable to output from the lighting device as much of the light emitted from the solid state light source as possible.

    [0011] The present invention is advantageous in that the lighting device provides both a decorative appearance (look) and functional illumination, and is still energy-efficient since the light emitted from the second light emitting element is directly emitted from the second light emitting element without unnecessary energy-loss.

    [0012] Further, the present invention is advantageous in that a double functionality (decorative lighting and functional lighting) is provided within a single lighting device, enabling an extended field of use since the lighting device may be used both in a decorative purpose and e.g. for general lighting or task lighting.

    [0013] According to the present invention, the illumination from the lighting device via the light guide and the first light emitting element is dedicated to a first type of lighting. Further, illumination from the lighting device from the second light emitting element without any light guide is dedicated to a second type of lighting.

    [0014] Accordingly, the first type of lighting and the second type of lighting are functionally and structurally separated such that each type of lighting can be optimized in terms of energy-efficiency.

    [0015] According to the present invention, the first light emitting element is dedicated to decorative lighting via the light guide, and the second light emitting element is dedicated to functional lighting (without any light guide).

    [0016] According to an embodiment of the present invention, the light intensity of the second light emitting element may be adjustable relative to the light intensity of the first light emitting element. Preferably the light intensity of the second light emitting element may be adjustable relative to the light intensity of the first light emitting element in response to an input signal to the lighting device. The input signal may be received at the lighting device from a dimmer connected to the lighting device (wherein the actual receiver of the dim signal is on the mains voltage). Alternatively, the input signal may be received at e.g. a low voltage circuitry of the lighting device (further described below) via a remote control (operated by a user of the lighting device). Preferably, a transfer function may be used such that the input voltage is correlated to a specific relationship or ratio between the intensity of the first light emitting element and the intensity of the second light emitting element. The present embodiment is advantageous in that it provides at least two different operation modes of the lighting device, a decorative mode for which the light intensity of the second light emitting element is lower than the light intensity of the first light emitting element and a functional mode for which the light intensity of the second light emitting element is higher than the light intensity of the first light emitting element. In other words, the light guide will become more visible and stand for a greater part of the total light-output from the lighting device when the light intensity of the second light emitting element is lowered in the decorative mode compared to when the lighting device is in the functional mode. In the functional mode, the light intensity of the second light emitting element will dominate the total light-output from the lighting device.

    [0017] In an embodiment of the present invention, at least one of the second light emitting element and the first light emitting element may be dimmable, which is advantageous in that it provides a step-less transition between the two above-mentioned operation modes of the lighting device. Moreover, the first light emitting element and the second light emitting element may be simultaneously and/or separately (individually) dimmed. For example, when the light intensity of the first light emitting element is increased, simultaneously, also the light intensity of the second light emitting element may be increased. Such a kind of regulation may be implemented using a single dimming device common to all light emitting elements (making the lighting device relatively technically simple). Hence, when both the first light emitting element and the second light emitting element are operated at a low dimmed level (i.e. at a low light intensity) the total light-output from the lighting device is low, thereby rendering visible the light guide which may provide a decorative appearance. In contrast, when the light emitting elements are driven at a high power level (i.e. at a high light intensity) the total light-output from the lighting device is high, thereby providing a functional lighting. It will be appreciated that such a kind of regulation with a common dimmer resembles the function of a traditional incandescent lighting device.

    [0018] According to another example, wherein the light emitting elements are individually dimmed, the light intensity of the first light emitting element is increased while the light intensity of the second light emitting element is decreased. The above-mentioned effects (for resemblance to the function of a traditional incandescent lighting device) may be achieved and even enhanced, when the first light emitting element and the second light emitting element have different light intensities.

    [0019] According to an embodiment of the invention, a wavelength (color) of the light emitted from the first light emitting element is adjustable, preferably in response to an input signal to the lighting device. For example, the color of the first light emitting element may be adjusted to be red/amber in the decorative mode and yellow/white in the functional mode.

    [0020] In an embodiment of the invention, the input signal to the lighting device may be a current or a voltage supplied to the lighting device. Further, lighting device may comprise a circuitry with a transfer function correlating the input signal with a light-output and/or the light color of the first and second light emitting element. As an illustrating example, for a low input signal (such as in a dimmed traditional incandescent lamp), the first light emitting element may provide a red/amber color and have a relatively low light intensity, while the light intensity of the second light emitting element may preferably be turned off. The stronger the input signal is, the more the first light emitting element may become yellow/white (and the more the light output from the first light emitting element is increased) and, at some threshold value of the input signal, the second light emitting element switches on and light-output is slowly increased.

    [0021] According to further embodiments of the present invention, the light guide may comprise an optical fiber, which is advantageous in that the optical fiber may resemble a carbon-filament. Alternately, the light guide may comprise a light guide plate, which may be designed in any desired way. For example, the light guide may be designed in any three-dimensional shape.

    [0022] According to an embodiment of the present invention, the light guide may be provided with diffusing means for out-coupling light. The diffusing means enhances the out-coupling of the light guided into the light guide and thus, renders the light guide more clearly visible. In an embodiment of the invention, the structure of the out-coupling surface (e.g. the roughness of the surface) may be selected to adjust the scattering of the light. Further, the light guide may comprise (scattering or diffusing) particles and/or vacuum/gas bubbles for out-coupling light. In other words, distortions of the optical characteristics of the light guide are provided for scattering out some of the light. These distortions may be located on the surface/edge of the light guide and/or inside of the light guide. Generally, any optical distortion resulting in a change of the internal light angles may result in that part of the light is coupled out of the light guide. Distortions in a 3D-shaped light guide may for example be obtained by local laser heating.

    [0023] According to an embodiment of the present invention, at least one of the first light emitting element and the second light emitting element may comprise at least one light emitting diode (LED), which is advantageous in that LEDs are high-efficient point-like light sources available in several different colors, thereby allowing various designs of the lighting device. Further, the LED may be a laser-LED, which is advantageous in that it improves the coupling of light to the light guide.

    [0024] According to an embodiment of the invention, a string of a plurality of light emitting diodes may be provided in the light guide.

    [0025] According to of the present invention, the lighting device comprises an envelope encapsulating the first light emitting element, the second light emitting element and the light guide, which is advantageous in that the light emitting elements and the light guide will be protected against damage and dust. Additionally, the lighting device will resemble a traditional incandescent light bulb.

    [0026] According to an embodiment of the present invention, the lighting device may further comprise a base at which the first light emitting element and the second light emitting element are arranged.

    [0027] Optionally, the lighting device may further comprise a diffusing/scattering element arranged on top of the second light emitting element e.g. in the form of a plate covering the second light emitting element(s). Such a diffusing/scattering element is advantageous in that an individual light emitting element will be less visible and provide a more even light distribution than without a diffusing/scattering element.

    [0028] Further objectives of, features of, and advantages with, the present invention will become apparent when studying the following detailed disclosure, the drawings and the appended claims. Those skilled in the art realize that different features of the present invention can be combined to create embodiments other than those described in the following. In particular, it will be appreciated that the various embodiments described for the lighting device are all combinable with the method as defined in accordance with the second aspect of the present invention.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0029] The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and nonlimiting detailed description of preferred embodiments of the present invention, with reference to the appended drawings, in which:

    Figure 1 shows a lighting device according to an embodiment of the present invention;

    Figure 2 shows a light guide according to an embodiment of the present invention;

    Figure 3 shows a light guide according to another embodiment of the present invention; and

    Figure 4 is a general outline of a method of manufacturing a lighting device according to an embodiment of the present invention.


    DETAILED DESCRIPTION OF EMBODIMENTS



    [0030] With reference to Figure 1, there is shown a lighting device in accordance with an embodiment of the present invention.

    [0031] Figure 1 shows a lighting device 1 comprising a first light emitting element 101 and a second light emitting element 102. The first light emitting element 101 is optically coupled to a light guide 110 having an out-coupling surface 111. The optical coupling can be provided e.g. via an optical element (not shown) arranged between the first light emitting element 101 and the light guide 110 or by linking the first light emitting element 101 directly to the light guide 110, as shown in Figure 1.

    [0032] Optionally, the lighting device may be provided with additional first light emitting elements being optically coupled to the light guide 110. For example, one first light emitting element may be coupled to a first end of the light guide 110 and another first light emitting element may be coupled to another end of the light guide 110 (opposite to the first end).

    [0033] Further, the lighting device may be provided with additional second light emitting elements 102 for providing functional lighting.

    [0034] The first light emitting element 101 and/or the second light emitting element 102 may for instance be light emitting diodes, LEDs, such as e.g. laser LEDs. For example, an amber colored LED, providing a warm light, may be used as the first light emitting element 101, thereby resulting in a light guide resembling a warm glowing filament (when the first light emitting element is activated/on). An alternative is to provide e.g. phosphor (or any other wavelength converting material) on top of the light guide (i.e. at the out-coupling surface of the lightguide) and select a phosphor providing a warm colored light. According to another example, the first light emitting element 101 may comprise a red LED, a green LED and a blue LED, thereby together providing a white light, which may be modulated into different colors by controlling the red, green and blue LED.

    [0035] Further, an LED of a colder color (which may be more efficient), such as white, may be used as the second light emitting element 102, thereby providing light being suitable for functional lighting. According to another example, the second light emitting element 102 may comprise a red LED, a green LED and a blue LED, thereby together providing a white light, which may be modulated into different colors by controlling the red, green and blue LED. However, it will be appreciated that the invention is not limited to such color configuration, the light emitting elements 101, 102 in the lighting device may be of any desired color.

    [0036] The light guide 110 may comprise an optical fiber (like an optical wave guide) made of a suitable material such as plastics or glass-fiber. The use glass-fiber material is advantageous because of its optical quality and material characteristics (e.g. sensitivity to heat). The optical fiber may be of a shorter or longer length allowing a simple or more complex design. For example, the optical fiber may be spirally wound in order to resemble a traditional retro-filament.

    [0037] The out-coupling of light from the out-coupling surface 111 of the light guide 110 may be achieved (and/or enhanced) in different ways. Some of the light may be out-coupled due to curvatures of the light guide 110. Moreover, the light guide 110 may be provided with diffusing means for out-coupling the light. In general, any optical distortion added to the light guide will provide out-coupling of light. The diffusing means may be provided e.g. by making the out-coupling surface 111 rough (e.g. by sand-blasting, scratching, or molding in a texture in the surface), or by providing indents or small protrusions in the out-coupling surface 111. Further, particles (e.g. white paint) and/or vacuum/gas bubbles (e.g. created by local laser heating) may be provided on or inside the light guide such that light is scattered out of the light guide.

    [0038] According to an embodiment of the present invention, the light guide 110 may comprise at least one connecting port 112 to which the first light emitting element 101 may be optically coupled. The present embodiment is advantageous in that it allows a great part of the light emitted from the first light emitting element 101 to be received and out-coupled by the light guide 110, thereby serving a decorative purpose, and still a great part of the light emitted from the second light emitting element 102 provides an illumination without unnecessary considerable energy-losses in any light guide.

    [0039] However, some (i.e. a relatively small part) of the light emitted from the second light emitting element(s) 102 may be coupled into the light guide 110 via the out-coupling surface 111, and thus, coupled out again via the out-coupling surface 111, thereby contributing to the illumination out of the light guide 110.

    [0040] With reference to Figure 2, there is shown an alternative design of a light guide according to an embodiment of the invention. Figure 2 shows a light guide in the form of a light guide plate 210 being optically coupled to a first light emitting element 201. Some of the light emitted from the first light emitting element 201 is coupled out via an edge 211 which may be curved (and optionally rough), thereby resulting in the appearance of a filament such as in a traditional light bulbs. Further, light may be coupled out via diffusing means provided inside the light guide plate 210 or on the surface of the light guide plate 210.

    [0041] It will be appreciated that the light guide may be designed in any desired three-dimensional shape, such as a spherical or prismatic shape. Further, the diffusing means may be provided at any desired position in or on the light guide. For example, the diffusing means may form a pattern (such as a filament-resembling pattern).

    [0042] With reference to Figure 3, there is shown another design of a light guide according to yet another embodiment of the invention. Figure 3 shows a light guide 320 in the form of a continuous optical element 323 in which a string of a plurality of LEDs 321 is arranged. The LEDs 321 may be mounted on a small flexible PCB (printed circuit board) 322 with the continuous optical element 323 on top of it (or encapsulating it).

    [0043] Turning again back to Figure 1, further embodiments of the invention will be described. The lighting device 1 comprises an envelope 130 encapsulating the first light emitting element 101, the second light emitting element 102 and the light guide110. Preferably, the envelope 130 is transparent (or at least semi-transparent) such that the light guide 110 is visible for providing a decorative effect. Further, the envelope 130 may be formed as a bulb resembling a traditional incandescent light bulb. The lighting device 1 may further comprise a base 140 at which the first light emitting element 101 and the second light emitting element 102 are arranged. The base 140 may comprise a bayonet base or a screw base 141 (e.g. of the type E14, E26 or E27), which is advantageous in that the lighting device can be fitted in conventional lamp fittings and used as a replacement for a traditional incandescent light bulb (retro-fitting). The base 140 may further comprise a heat-sink 142 for cooling the light emitting diodes 101, 102. Optionally, the light emitting elements 101, 102 may be arranged such that an upper portion of the heat-sink 142 (or an upper portion of the base 140) hides the light emitting elements 101, 102 (as shown in Figure 1) for reducing the risk of direct view of them. Further, the inside of the upper portion of the heat-sink 142 may be reflective such that all (or at least almost all) light emitted from the light emitting elements 101, 102 can be output from the lighting device.

    [0044] The lighting device may further comprise a diffusing/scattering element (not shown) in form of a plate on top of the second light emitting elements 102. For example, such plate may be arranged on top of the base 140. The plate may be provided with a hole where light emitted from the first light emitting element 101 may go through to be coupled into the light guide 110.

    [0045] The lighting device 1 may further comprise electronic driving means 150 provided with a power supply for converting the mains voltage supply into an output signal suitable for driving the light emitting elements 101, 102. The electric driving means 150 may further comprise an electronic circuitry configured to control the light intensity of the first light emitting element 101 and/or the second light emitting element 102 such that the light intensity of the second light emitting element 102 is adjustable relative to the light intensity of the first light emitting element 101. Further, the electronic circuitry may be configured to slightly modulate the brightness (or color) of the first light emitting element 101, or to sequentially switch on and off the first light emitting element 101, for providing a flame and flickering effect of the light guide 110. The electronic circuitry may further contain a transfer function for correlating an input signal (such as input current or input voltage) with a light output and/or an emission color of the first and second light emitting elements. The electric driving means 150 may be controlled by a remote control unit, by buttons on the base 140 or by any other type of user interface.

    [0046] In an embodiment of the invention, the first light emitting element 101 and/or the second light emitting element 102 may be dimmable. In an embodiment of the invention, the lighting device supports traditional incandescent light dimmers such that the light emitting elements can operate in a dimmed mode.

    [0047] With reference to Figure 4, a method of manufacturing a lighting device according to an embodiment of the present invention will be described. Figure 4 shows the general outline of a method 400 of manufacturing a lighting device. The method comprises a step 410 of providing a first light emitting element, a step 420 of providing a light guide having an out-coupling surface, and a step 430 of optically coupling the first light emitting element to the light guide. Further, the method 400 comprises a step 440 of providing a second light emitting element dedicated for direct illumination from the lighting device.

    [0048] While specific embodiments have been described, the skilled person will understand that various modifications and alterations are conceivable within the scope as defined in the appended claims.

    [0049] For example, additional light guides with associated first light emitting elements may be provided in the lighting device. Further, the lighting device can be applied in standalone retro-fit incandescent bulb replacements as well as in dedicated new luminaries. Moreover, the lighting device is not limited to be designed as a conventional light bulb. It can also be designed e.g. as a tubular-shaped lamp with connectors at both ends of the tube.


    Claims

    1. A lighting device for providing decorative lighting comprising:

    a first light emitting element (101) being optically coupled to a light guide (110) having an out-coupling surface (111) for decorative illumination via the light guide;

    characterized by a second light emitting element (102) dedicated for providing a further direct functional illumination from the lighting device, and

    an envelope (130) encapsulating said first light emitting element (101), said light guide (110), and said second light emitting element (102).


     
    2. A lighting device as defined in claim 1, wherein the light intensity of the second light emitting element is adjustable relative to the light intensity of the first light emitting element, preferably in response to an input signal to the lighting device.
     
    3. A lighting device as defined in any one of the preceding claims, wherein at least one of the second light emitting element and the first light emitting element is dimmable.
     
    4. A lighting device as defined in any one of the preceding claims, wherein a wavelength (color) of the light emitted from the first light emitting element is adjustable, preferably in response to an input signal to the lighting device.
     
    5. A lighting device as defined in any one of the preceding claims, wherein the light guide comprises an optical fiber, a light guide plate (210), or a three-dimensionally shaped light guide.
     
    6. A lighting device as defined in any one of the preceding claims, wherein the light guide is provided with diffusing means for out-coupling light.
     
    7. A lighting device as defined in any one of the preceding claims, wherein the structure of the out-coupling surface is selected to adjust scattering of the light.
     
    8. A lighting device as defined in any one of the preceding claims, wherein the light guide comprises particles and/or vacuum/gas bubbles for out-coupling light.
     
    9. A lighting device as defined in any one of the preceding claims, wherein at least one of the first light emitting element and the second light emitting element comprises at least one light emitting diode.
     
    10. A lighting device as defined in any one of the preceding claims, wherein a string of a plurality of light emitting diodes (321) is provided in the light guide (320).
     
    11. A lighting device as defined in any one of the preceding claims, further comprising a base (140) at which the first light emitting element and the second light emitting element are arranged.
     
    12. A lighting device as defined claim 11, characterized in that said base (140) comprises a bayonet or screw base (141) for retro-fitting a traditional incandescent light bulb.
     
    13. A method of manufacturing a lighting device for providing decorative lighting, the method comprising the steps of:

    providing a first light emitting element (101);

    providing a light guide (110) having an out-coupling surface for decorative illumination via the light guide;

    optically coupling the first light emitting element to the light guide;

    providing a second light emitting element (102) dedicated for direct functional illumination from the lighting device; and

    encapsulating said first light emitting element (101), said light guide (110), and said second light emitting element (102) in an envelope (130).


     


    Ansprüche

    1. Beleuchtungsvorrichtung zur Bereitstellung einer dekorativen Beleuchtung, umfassend:

    ein erstes lichtemittierendes Element (101), das optisch mit einem Lichtleiter (110) mit einer Auskopplungsoberfläche (111) zur dekorativen Beleuchtung über den Lichtleiter gekoppelt ist;

    gekennzeichnet durch

    ein zweites lichtemittierendes Element (102), das dazu bestimmt ist, eine weitere direkte Funktionsbeleuchtung von der Beleuchtungsvorrichtung zu liefern, und

    eine Hülle (130), die das erste lichtemittierende Element (101), den Lichtleiter (110) und das zweite lichtemittierende Element (102) einkapselt.


     
    2. Beleuchtungsvorrichtung nach Anspruch 1, wobei die Lichtintensität des zweiten lichtemittierenden Elements relativ zur Lichtintensität des ersten lichtemittierenden Elements einstellbar ist, vorzugsweise als Reaktion auf ein Eingangssignal zu der Beleuchtungsvorrichtung.
     
    3. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei mindestens eines von dem zweiten lichtemittierenden Element und dem ersten lichtemittierenden Element dimmbar ist.
     
    4. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei eine Wellenlänge (Farbe) des von dem ersten lichtemittierenden Element emittierten Lichts einstellbar ist, vorzugsweise als Reaktion auf ein Eingangssignal zu der Beleuchtungsvorrichtung.
     
    5. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei der Lichtleiter eine optische Faser, eine Lichtleiterplatte (210) oder einen dreidimensional geformten Lichtleiter umfasst.
     
    6. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei der Lichtleiter mit Streumitteln zum Auskoppeln von Licht versehen ist.
     
    7. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei die Struktur der auskoppelnden Oberfläche ausgewählt ist, um die Streuung des Lichts einzustellen.
     
    8. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei der Lichtleiter Partikel und/oder Vakuum/Gasblasen zum Auskoppeln von Licht umfasst.
     
    9. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei mindestens eines von dem ersten lichtemittierenden Element und dem zweiten lichtemittierenden Element mindestens eine lichtemittierende Diode umfasst.
     
    10. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, wobei eine Kette aus einer Vielzahl von lichtemittierenden Dioden (321) in dem Lichtleiter (320) vorgesehen ist.
     
    11. Beleuchtungsvorrichtung nach einem der vorstehenden Ansprüche, die weiter eine Basis (140) umfasst, an der das erste lichtemittierende Element und das zweite lichtemittierende Element angeordnet sind.
     
    12. Beleuchtungsvorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass die Basis (140) eine Bajonett- oder Schraubbasis (141) zum Nachrüsten einer herkömmlichen Glühlampe umfasst.
     
    13. Verfahren zur Herstellung einer Beleuchtungsvorrichtung zur Bereitstellung einer dekorativen Beleuchtung, wobei das Verfahren die Schritte umfasst:

    Bereitstellen eines ersten lichtemittierenden Elements (101);

    Bereitstellen eines Lichtleiters (110) mit einer Auskopplungsoberfläche zur dekorativen Beleuchtung über den Lichtleiter;

    optisches Koppeln des ersten lichtemittierenden Elements mit dem Lichtleiter;

    Bereitstellen eines zweiten lichtemittierenden Elements (102), das für eine direkte funktionelle Beleuchtung von der Beleuchtungsvorrichtung bestimmt ist; und

    Einkapselung des ersten lichtemittierenden Elements (101), des Lichtleiters (110) und des zweiten lichtemittierenden Elements (102) in einer Hülle (130).


     


    Revendications

    1. Dispositif d'éclairage pour fournir un éclairage décoratif comprenant :

    - un premier élément électroluminescent (101) qui est couplé optiquement à un guide lumineux (110) ayant une surface de couplage de sortie (111) pour une élimination décorative par l'intermédiaire du guide lumineux ;

    caractérisé par un second élément électroluminescent (102) dédié à fournir une autre illumination fonctionnelle directe depuis le dispositif d'éclairage, et
    une enveloppe (130) encapsulant ledit premier élément électroluminescent (101), ledit guide lumineux (110), et ledit second élément électroluminescent (102).
     
    2. Dispositif d'éclairage selon la revendication 1, dans lequel l'intensité lumineuse du second élément électroluminescent est ajustable par rapport à l'intensité lumineuse du premier élément électroluminescent, de préférence en réponse à un signal d'entrée au dispositif d'éclairage.
     
    3. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel au moins l'un du second élément électroluminescent et du premier élément électroluminescent est à intensité variable.
     
    4. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel une longueur d'onde (couleur) de la lumière émise depuis le premier élément électroluminescent est ajustable, de préférence en réponse à un signal d'entrée au dispositif d'éclairage.
     
    5. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel le guide lumineux comprend une fibre optique, une plaque de guide lumineux (210), ou un guide lumineux de forme tridimensionnelle.
     
    6. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel le guide lumineux est pourvu de moyens de diffusion pour le couplage de sortie de lumière.
     
    7. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel la structure de la surface de couplage de sortie est sélectionnée pour ajuster une dispersion de la lumière.
     
    8. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel le guide lumineux comprend des particules et/ou des bulles de vide/gaz pour le couplage de sortie de lumière.
     
    9. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel au moins l'un du premier élément électroluminescent et du second élément électroluminescent comprend au moins une diode électroluminescente.
     
    10. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, dans lequel une chaîne d'une pluralité de diodes électroluminescentes (321) est prévue dans le guide lumineux (320).
     
    11. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, comprenant en outre une base (140) à laquelle le premier élément électroluminescent et le second élément électroluminescent sont agencés.
     
    12. Dispositif d'éclairage selon la revendication 11, caractérisé en ce que ladite base (140) comprend une base à baïonnette ou à vis (141) pour l'adaptation d'une ampoule lumineuse incandescente traditionnelle.
     
    13. Procédé de fabrication d'un dispositif d'éclairage pour fournir un éclairage décoratif, le procédé comprenant les étapes de :

    la fourniture d'un premier élément électroluminescent (101) ;

    la fourniture d'un guide lumineux (110) ayant une surface de couplage de sortie pour une illumination décorative par l'intermédiaire du guide lumineux ;

    le couplage optique du premier élément électroluminescent au guide lumineux ;

    la fourniture d'un second élément électroluminescent (102) dédié à une illumination fonctionnelle directe depuis le dispositif d'éclairage ; et

    l'encapsulation dudit premier élément électroluminescent (101), dudit guide lumineux (110), et dudit second élément électroluminescent (102) dans une enveloppe (130).


     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description