• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a light device (12, 14) for a motor vehicle headlamp lighting module (10), comprising a light source (24), said source comprising: - a base (40) comprising two opposite faces, a first face (46) forming a first joining surface (72); an optoelectronic chip (42) fixed to the second face of the base; - connection tabs (44) projecting from the first face of the base and connected to the chip; said light device further comprising a heat exchanger (32) including a second mounting surface (74) connected to the first mounting surface. The two joining surfaces are joined to each other by means of an adhesive material (70); each of the connecting tabs has a portion (80) extending radially in the adhesive material; and said connecting tabs (44) do not pass through the second assembly surface (74).
    公开号:FR3044391A1
    申请号:FR1561526
    申请日:2015-11-27
    公开日:2017-06-02
    发明作者:Stephan Sommerschuh；Saad Lotfi Redjem
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    Luminous device for motor vehicle headlamp lighting module, lighting module and associated projectors
    The present invention relates to a light device for a motor vehicle headlamp lighting module, of the type comprising a light source arranged along a main emission axis, said light source comprising: a base comprising a first and a second opposite face, said first face forming a first assembly surface substantially orthogonal to the main transmission axis; an optoelectronic chip attached to the second face of the base; connecting tabs attached to the first face of the base and projecting from the first mounting surface, said tabs being electrically connected to the optoelectronic chip; said light device further comprising a heat exchanger adapted to cool the light source, said heat exchanger comprising a second assembly surface connected to the first assembly surface of the light source.
    It is known to provide, in the front of a motor vehicle, projectors capable of forming light beams to perform different lighting functions, for example of the "high beam" or "low beam" type.
    Adaptive fire devices make it possible to adjust the intensity, the dimensions and / or the direction of the beams according to the traffic conditions, in order to fulfill these various functions.
    Each projector generally comprises several lighting modules that make it possible to form a light beam of the projector. The modules can be switched on or off independently of each other to vary the beam characteristics in real time.
    By lighting module is meant an assembly containing at least one light source and an optical projection or reflection system.
    Lighting modules, as described in the document EP2690352 in the name of the Applicant, comprise in particular light devices comprising laser diodes, emitting in blue light, and a device able to convert the laser radiation into a beam of light white. Such a conversion device consists for example of phosphor elements.
    The laser diodes generate a significant heat in operation, it is necessary to associate them with a heat exchanger type radiator, to cool them.
    The laser diodes conventionally used in the lighting modules are of the type described in the document US2005265410. These diodes comprise in particular electrical connection tabs, arranged on a face opposite to the light beam.
    Usually, the diode is assembled to the radiator at said face carrying the connection tabs. It is then necessary to provide on the radiator a through hole to accommodate said tabs. This orifice reduces the heat exchange surface with the diode, which degrades the efficiency of the radiator.
    The present invention aims to propose an improvement of existing light devices, in particular by optimizing the efficiency of the heat exchanger of the light source of said devices. To this end, the present invention relates to a light device of the aforementioned type, wherein: the first and second assembly surfaces are joined to one another by means of a layer of adhesive material; each of the connecting tabs has a portion extending radially in the layer of adhesive material; and said connecting tabs do not pass through the second assembly surface.
    According to other advantageous aspects of the invention, the luminous device comprises one or more of the following characteristics, taken separately or in any technically possible combination: the second joining surface is continuous and has no orifice ; the first and second joining surfaces are inclined with respect to each other; the heat exchanger comprises at least one relief with respect to the second assembly surface, said relief being embedded in the layer of adhesive material; the adhesive material incorporates particles capable of increasing a thermal conductivity of said material; - The light device further comprises an optical device capable of concentrating the light emitted by the light source and / or a reflector adapted to deflect the light emitted by the light source. The invention also relates to a motor vehicle headlamp lighting module comprising at least one light device as described above.
    According to other advantageous aspects of the invention, the lighting module comprises one or more of the following characteristics, taken separately or in any technically possible combination: the light source is a laser diode and the module also comprises a device for converting the wavelength of the light emitted by said laser diode, as well as an optical imaging system capable of forming at infinity an image of beams emitted by said conversion device; the module comprises a support, said support comprising a central wall and two lateral walls substantially aligned in a plane substantially perpendicular to an optical axis of the optical imaging system, the wavelength conversion device being fixed to said central wall; , a light device as described above being attached to each of the side walls, the light source of each of said light devices being a laser diode. The invention further relates to a motor vehicle headlamp, comprising at least one lighting module as described above. The invention will be better understood on reading the description which follows, given solely by way of nonlimiting example and with reference to the drawings in which: FIG. 1 is a perspective view of a lighting module according to one embodiment of the invention, comprising two light devices; Figure 2 is a schematic sectional view of a light device of the module of Figure 1; Figure 3 is a partial schematic view, in section, of the light device of Figure 2; Figure 4 is a detailed view, in perspective, of a light device according to another embodiment of the invention; and FIG. 5 is a partial view, in perspective, of the light device of FIG. 4.
    Figure 1 shows in perspective a lighting module 10 according to a first embodiment of the invention.
    The lighting module 10 is intended to be incorporated in a motor vehicle headlamp, said headlamp optionally comprising one or more other lighting modules.
    The lighting module 10 comprises a first 12 and a second 14 light devices, a device 16 for converting wavelength and an optical imaging system 18.
    The module 10 further comprises a support 20 to which are attached the first 12 and second 14 light devices and the conversion device 16.
    An orthonormal base (X, Y, Z) represented in FIGS. 1, 2 and 3 is considered. The horizontal axes X and Y are respectively parallel and perpendicular to an optical axis 22 of the optical system 18; the Z axis is vertical.
    FIGS. 2 and 3 respectively represent a sectional and sectional view of the first light device 12. The following description of the first light device 12 is applicable to the second light device 14.
    The light device 12 comprises a light source 24 disposed along a main transmission axis 26, parallel to X. In the embodiment of FIGS. 1 to 3, the light source 24 is a laser diode.
    The laser diode 24 emits for example a visible beam whose wavelength is between 400 nm and 500 nm, preferably between 440 nm and 470 nm. The laser diode 24 is described in detail below.
    The light device 12 further comprises an optical device 27 capable of concentrating the beam emitted by the laser diode 24. The optical device 27 is substantially disposed on the main transmission axis 26.
    The light device 12 further comprises a reflector 28 adapted to send to the conversion device 16 a light beam emitted by the laser diode 24 and concentrated by the optical device 27. Preferably, the reflector 28 is movable in one or two directions, so as to form a scanning system. According to one embodiment, the reflector 28 is formed of several movable mirrors independently. In a variant, the reflector 28 is static.
    The light device 12 further comprises: a housing 30, enclosing the diode 24, the optical device 27 and the reflector 28; and a heat exchanger 32, assembled to the diode 24.
    As represented in FIGS. 2 and 3, the laser diode 24 comprises in particular a base 40, an optoelectronic chip 42 and lugs 44 of electrical connection.
    The base 40 has substantially the shape of a washer and comprises a first 46 and a second 48 opposite faces, substantially arranged in (Y, Z) planes.
    The tabs 44 protrude from the first face 46 of the base. In the embodiment shown in FIGS. 2 and 3, the diode 24 comprises two tabs 44.
    The optoelectronic chip 42 is attached to the second face 48 of the base. By "optoelectronic chip" is meant an electronic component that emits light when it is supplied with electrical energy. The optoelectronic chip 42 is electrically connected to the tabs 44 through the base 40.
    The laser diode 24 further comprises a cover 50 fixed to the second face 48 of the base around the chip 42. The cover 50 comprises a window 52 aligned with the chip 42 along the transmission axis 26, so as to allow the output of the laser beam emitted by said chip 42.
    In the embodiment of FIGS. 1 to 3, the heat exchanger 32 is a radiator including in particular a base 60 and fins 62. The base 60 and the fins 62 are preferably made integrally, in particular by molding or machining, in a material with good thermal conductivity. Said material is preferably a metal such as aluminum.
    The base 60 has a substantially flat shape, disposed in a plane parallel to Y and inclined at an angle α with respect to X. The angle a is less than 90 ° and preferably between 45 ° and 80 °, more preferably included between 60 ° and 70 °.
    The fins 62 have an elongated shape and extend along X from a first face 64 of the base 60. The ends 65 of the fins 62, opposite to said first face 64, are arranged in a plane (Y, Z) .
    A second face 66 of the base 60 is assembled to the first face 46 of the base 40 of the diode 24. Said faces 46, 66 are inclined with respect to each other, they are assembled by means of a layer 68 of adhesive material 70.
    More specifically, the first face 46 of the base 40 forms a first assembly surface 72, having substantially a circular contour. Said circular contour forms the base of a cylindrical outer surface 73 of the adhesive layer 68, extending along X to a second assembly surface 74, belonging to the second face 66 of the base 60. The second surface 60 assembly 74 has an oval contour corresponding to the projection of the first joining surface 72 in the inclined plane of the base 60.
    The adhesive material 70 is for example an epoxy adhesive incorporating particles capable of increasing a thermal conductivity of said adhesive. Said particles are, for example, silver particles.
    As can be seen in FIG. 3, the connection tabs 44 of the diode 24 do not pass through the second assembly surface 74. More particularly, the connection tabs 44 are entirely located on the same side of the base 60 as the base 40 of the the diode 24. In addition, the second assembly surface 74 is continuous and has no orifice. Thus, the heat exchange surface between the diode 24 and the radiator 32 is optimized.
    Each of the connection tabs 44 comprises a portion 80 extending in the adhesive layer 68 radially, that is to say perpendicularly to X. In the example of FIGS. 2 and 3, each portion 80 extends according to Y. The portion 80 emerges at the cylindrical outer surface 73 and is connected to an electrical wire 82.
    The housing 30 defines an internal space 84 containing the diode 24 and the reflector 28. An edge 86 of the housing is attached to the second face 66 of the base 60, closing said internal space 84. Said edge 86 has a notch 88 (FIG. ) allowing the electrical wires 82 to extend outside said housing and to be connected to a power supply of the diode 24.
    The housing 30 further comprises a lateral opening 90 allowing the output of the light beam emitted by the diode 24 and deflected by the reflector 28, to the wavelength conversion device 16.
    The support 20 comprises a central wall 92 and two side walls 94, 96. Said walls are substantially flat, arranged substantially in the same plane (Y, Z) and oriented along X in the direction of the optical imaging system 18. The central wall 92 is disposed between the side walls 94, 96 according to Z.
    Each of the first 12 and second 14 light devices is attached to a side wall 94, 96. Specifically, the free ends 65 of each radiator 32 are fixed to a side wall, as shown in Figure 2 for a first side wall 94. The inclination of the second face 66 of the base 60 is arranged so as to orient said second face towards the optical axis 22 of the optical imaging system 18.
    The wavelength conversion device 16 is fixed to the central wall 92. Said device 16 is for example formed of a plate of a reflective substrate for the laser radiation, on which is deposited a continuous and homogeneous layer of phosphor 98.
    Said phosphor layer 98 is disposed near the focal plane of the optical system 18. Said optical system 18 comprises for example one or more lenses (not shown).
    A method of operation of the lighting module 10 will now be described. When each of the diodes 24 is supplied with electricity, it emits laser radiation which is sent to the conversion device 16 by the reflector 28. If the reflector 28 forms a scanning system, several points of the phosphor layer 98 successively receive the laser radiation of the diode 24.
    In known manner, each point of the layer 98, receiving monochromatic and coherent "blue" laser radiation, reemits a light considered as "white", that is to say having a plurality of wavelengths between 400 nm. and about 800 nm.
    The optical imaging system 18 then forms at infinity an image of the luminous points of the phosphor layer 98, in the form of a light beam capable of illuminating the road ahead of a vehicle.
    The heat diffused by each diode 24 is dissipated by the radiator 32, through the layer 68 of adhesive material. Overheating of the diode 24 is thus avoided. For example, the thermal conductivity of the epoxy glue charged with silver particles is between 2 and 10 W.m'1.K'1.
    However, for comparison, the thermal conductivity of the aluminum forming the radiator 32 is 237 W.m'1.K'1. In general, the thermal conductivity of the adhesive material is lower than the thermal conductivities of the materials respectively forming the first and second joining surfaces.
    FIGS. 4 and 5 illustrate a light device 112 according to a second embodiment of the invention, making it possible to further improve the heat transfer between the diode 24 and the radiator 32. The light device 112 is identical to the light device 12 described herein. above, except for the items specified below. The common elements between the light devices 12 and 112 are designated by the same reference numerals.
    In Figure 5, only the diode 24, the radiator 32, the adhesive layer 68 and the power supply wires 82 of the light device 112 are shown.
    The adhesive layer 68 and the second face 66 of the base 60 of the radiator 32 are shown in detail in FIG. 4. The base 60 comprises at least one relief 113, preferably several reliefs 113 which extend along X from of the second face 66. In particular, the reliefs 113 extend from the second joining surface 74. In the example of FIGS. 4 and 5, the reliefs 113 have the shape of pins, substantially cylindrical and terminally pointed. . Other forms of relief are possible.
    The reliefs 113 are for example made integrally with the base 60 and the fins 62, in particular by molding or machining.
    Preferably, a length of the reliefs 113 along X is slightly smaller than the corresponding thickness of the adhesive layer 68. Thus, the reliefs 113 are not in contact with the first assembly surface 72 formed by the base 40 of the diode 24, so as not to interfere with the spatial orientation of said diode during assembly. As a variant, at least a portion of the reliefs 113 is in contact with the first joining surface 72, in order to improve the heat transfer between the diode 24 and the radiator 32.
    The reliefs 113 are preferably of different lengths, so as to approach closer to the first assembly surface 72 taking into account the inclination of the base 60 relative to the direction X. As shown in Figure 4 , the reliefs 113 are distributed substantially regularly on the second assembly surface 74, with the exception of a central zone 115. Said central zone 115 is left free for the passage of the connection tabs 44 of the diode 24, and in particular radial portions 80, through the adhesive layer 68.
    According to an alternative embodiment of the lighting module 10 described above, a light device 112 is used in place of the first 12 and / or the second 14 light devices. The presence of the reliefs 113 inside the adhesive layer 68 improves the heat transfer between the diode 24 in operation and the radiator 32.
    A method of manufacturing the light device 12, 112 will now be described. The housing 30 is first assembled to the reflector 28, the optical device 27 and the diode 24, so as to position the transmission axis 26 of the diode 24 relative to said housing 30 and said reflector 28. A stud glue 70 in the fluid or semi-fluid state, is disposed on the second assembly surface 74 of the radiator 32. In the case of the device 112, the glue 70 is disposed so as to drown the pins 113. The edge 86 of the housing 30 is then applied to the second face 66 of the base 60, so as to bring the first joining surface 72 of the diode 24 into contact with the adhesive 70. The connection tabs 44 of the diode 24 penetrate the fluid or semi-fluid glue. Said glue is then solidified, so as to form the layer 68 which solidarises and puts the diode 24 and the radiator 32 in thermal contact.
    In the embodiments described above, the heat exchanger 32 is a finned radiator. As a variant, the heat exchanger 32 comprises a heat-transfer fluid conduit, in particular a liquid conduit. Other types of heat exchangers can be used in the context of the invention.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1, - Lighting device (12, 14, 112) of a motor vehicle headlamp lighting module (10), comprising a light source (24) arranged along a main emission axis (26), said light source comprising: a base (40) comprising a first (46) and a second (48) opposite face, said first face forming a first joining surface (72) substantially orthogonal to the main emission axis; an optoelectronic chip (42) fixed to the second face of the base; connecting tabs (44) fixed to the first face of the base and protruding with respect to the first joining surface, said tabs being electrically connected to the optoelectronic chip; said light device further comprising a heat exchanger (32) adapted to cool the light source, said heat exchanger comprising a second mounting surface (74) connected to the first assembly surface of the light source, said light device characterized in that: - the first and second joining surfaces are joined to each other by means of a layer (68) of adhesive material (70); each of the connection tabs comprises a portion (80) extending radially in the layer of adhesive material; and - said connecting lugs (44) do not pass through the second joining surface (74).
    [2" id="c-fr-0002]
    2, - luminous device according to claim 1, wherein the second connecting surface (74) is continuous and has no orifice.
    [3" id="c-fr-0003]
    3, - light device according to claim 1 or claim 2, wherein the first (72) and second (74) assembly surfaces are inclined relative to each other.
    [4" id="c-fr-0004]
    4, - luminous device (112) according to one of the preceding claims, wherein the heat exchanger (32) comprises at least one relief (113) relative to the second mounting surface (74), said relief being embedded in the layer (68) of adhesive material.
    [5" id="c-fr-0005]
    5, - light device according to one of the preceding claims, wherein the adhesive material (70) incorporates particles capable of increasing a thermal conductivity of said material.
    [6" id="c-fr-0006]
    6, - luminous device according to one of the preceding claims, further comprising an optical device (27) adapted to concentrate the light emitted by the light source and / or a reflector (28) adapted to deflect the light emitted by the light source .
    [7" id="c-fr-0007]
    7, - Lighting module (10) motor vehicle headlamp, comprising at least one light device (12, 14, 112) according to one of the preceding claims.
    [8" id="c-fr-0008]
    8, - lighting module according to claim 7, wherein the light source (24) is a laser diode, said module further comprising a device (16) for converting the wavelength of the light emitted by said laser diode , as well as an optical imaging system (18) capable of infinitely forming an image of beams emitted by said conversion device.
    [9" id="c-fr-0009]
    9, - lighting module (10) according to claim 8, comprising a support (20), said support comprising a central wall (92) and two side walls (94, 96) substantially aligned in a plane (Y, Z) substantially perpendicular to an optical axis (22) of the imaging optical system (18), the wavelength conversion device (16) being attached to said central wall, a light device (12, 14) according to one claims 1 to 6 being attached to each of the side walls, the light source (24) of each of said light devices being a laser diode.
    [10" id="c-fr-0010]
    10, - Motor vehicle headlight, comprising at least one lighting module (10) according to one of claims 7 to 9.
    类似技术:
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    FR3046660A1|2017-07-14|MOTOR VEHICLE PROJECTOR LIGHTING MODULE AND PROJECTOR
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    同族专利:
    公开号 | 公开日
    KR20170062405A|2017-06-07|
    EP3173681B1|2019-06-12|
    CN106813185A|2017-06-09|
    CN106813185B|2021-04-13|
    US20170153003A1|2017-06-01|
    US10281130B2|2019-05-07|
    FR3044391B1|2018-01-05|
    EP3173681A1|2017-05-31|
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    法律状态:
    2016-11-30| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-02| PLSC| Publication of the preliminary search report|Effective date: 20170602 |
    2017-11-30| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-29| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-30| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-30| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1561526|2015-11-27|
    FR1561526A|FR3044391B1|2015-11-27|2015-11-27|LUMINOUS DEVICE FOR MOTOR VEHICLE PROJECTOR LIGHTING MODULE, LIGHTING MODULE AND ASSOCIATED PROJECTORS|FR1561526A| FR3044391B1|2015-11-27|2015-11-27|LUMINOUS DEVICE FOR MOTOR VEHICLE PROJECTOR LIGHTING MODULE, LIGHTING MODULE AND ASSOCIATED PROJECTORS|
    EP16199265.6A| EP3173681B1|2015-11-27|2016-11-17|Lighting device for lighting module of a motor vehicle headlight, associated lighting module and projectors|
    US15/357,187| US10281130B2|2015-11-27|2016-11-21|Light-emitting device for an automotive vehicle headlamp lighting module and associated lighting module and headlamps|
    KR1020160157974A| KR20170062405A|2015-11-27|2016-11-25|Light-emitting device for an automotive vehicle headlamp lighting module and associated lighting module and headlamps|
    CN201611063813.0A| CN106813185B|2015-11-27|2016-11-25|Light-emitting device for a motor vehicle headlight lighting module, and associated lighting module and headlight|
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