• 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 lighting module (10) of a motor vehicle headlamp, comprising: - at least a first light source (12); a device (16) for converting the wavelength of the light emitted by said first light source; and a fan (20) capable of generating an air flow. The lighting module has at least one first (66) and second (68) separate air ducts, the fan being placed at the inlet (72, 74) of each of said first and second air ducts so as to distribute the air flow between said ducts, the first light source and the wavelength conversion device being respectively disposed at the outlet of the first and second air ducts.
    公开号:FR3044393A1
    申请号:FR1561525
    申请日:2015-11-27
    公开日:2017-06-02
    发明作者:Stephan Sommerschuh
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    Motor vehicle headlamp lighting module and associated projector
    The present invention relates to a motor vehicle headlamp lighting module, of the type comprising: at least one first light source; a device for converting the wavelength of the light emitted by said first light source; and a fan adapted to generate an air flow.
    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 light sources of the laser diode type, emitting in blue light, and a device able to convert the laser radiation into light. a beam of white light. Such a conversion device consists for example of phosphor elements.
    The light sources and the conversion device generate a significant heat in operation, it is necessary to cool them. It is in particular known to equip the lighting modules with fans that generate a flow of air capable of convection cooling the heating elements.
    The presence of a fan for each of the aforementioned elements allows optimal cooling. This solution is however expensive.
    The present invention aims to propose an improvement of existing lighting modules, optimizing in particular the cooling efficiency of the various elements emitting heat. For this purpose, the present invention relates to a lighting module of the aforementioned type, comprising at least a first and a second separate air ducts, the fan being placed at the inlet of each of said first and second air ducts. so as to distribute the air flow between said ducts, the first light source and the wavelength conversion device being respectively disposed at the outlet of the first and second air ducts.
    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 lighting module comprises at least one second light source, the conversion device being adapted to receive light emitted by said second light source, said lighting module comprising at least a third air duct distinct from the first and second air ducts, the fan being placed at the entrance of said third duct; of air so as to distribute the air flow between said ducts, the second light source being disposed at the outlet of said third air duct; the lighting module comprises a support to which the fan, the wavelength converting device, the first and possibly the second light source (s) are attached, said support comprising one or more wall (s); internal (s) defining the air ducts; - The air ducts are configured to direct on the wavelength conversion device a fraction of between 10% and 40%, preferably between 15% and 25%, of the air flow generated by the fan; at least the first light source is in contact with a radiator able to exchange heat with a flow of air, said radiator being disposed in the air duct corresponding to said light source; at least the first light source is a semiconductor light source, preferably a laser diode, emitting radiation whose wavelength is preferably between 400 nm and 500 nm; - The wavelength conversion device comprises a laser reflective plate and a phosphor layer covering said plate; - The lighting module further comprises at least one reflective device adapted to deflect the light emitted by at least the first light source and to return said light to the wavelength conversion device; - The lighting module further comprises an optical imaging system capable of projecting the light re-emitted by the wavelength conversion device. 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 sectional view of a module of FIG. lighting according to one embodiment of the invention; Figure 2 is an exploded perspective view of elements of the lighting module of Figure 1; and FIG. 3 is a rear view of an element of the lighting module of FIG. 1.
    Figure 1 shows in section 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 fan 20, able to generate an air flow.
    The module 10 further comprises a support 22 to which are attached the first 12 and second 14 light devices, the conversion device 16, the optical system 18 and the fan 20.
    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 23 of the optical system 18; the Z axis is vertical.
    In the example of Figure 1, the first 12 and second 14 light devices are substantially identical and correspond to the same description below.
    The light device 12, 14 comprises a light source 24 disposed along an emission axis substantially parallel to X. Preferably, the light source 24 is a semiconductor light source, more preferably a laser diode. In the example of FIG. 1, the light source 24 of each of the light devices 12, 14 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 light device 12, 14 further comprises an optical device capable of concentrating the beam emitted by the laser diode 24.
    The light device 12, 14 further comprises a reflector 26 adapted to send to the conversion device 16 a light beam emitted by the laser diode 24 and concentrated by the optical device. Preferably, the reflector 26 is movable in one or two directions, so as to form a scanning system. In the example of Figure 1, the reflector 26 is formed of several movable mirrors independently. The displacement of the mirrors of the reflector is notably controlled by an electronic card 28.
    The light device 12, 14 further comprises: an envelope 30, enclosing the diode 24, the optical device and the reflector 26; and a heat exchanger 32, assembled to the diode 24. The heat exchanger 32 is preferably a finned radiator made of a material with good thermal conductivity such as aluminum. The envelope 30 has a lateral orifice 34 allowing the output of the light beam emitted by the diode 24 and deflected by the reflector 26, to the wavelength conversion device 16.
    The wavelength conversion device 16 is for example formed of a plate 36 of a reflective substrate for the laser radiation, on which is deposited a continuous and homogeneous layer 38 of phosphor. The plate 36 is for example made of aluminum.
    The phosphor layer 38 is disposed in a plane (Y, Z). The first 12 and second 14 light devices are respectively arranged above and below, along Z, of said layer 38.
    The plane (Y, Z) of the layer 38 is close to a focal plane of the optical system 18. Said optical system 18 comprises, for example, one or more lenses 40.
    In the example of FIG. 1, the support 22 of the lighting module 10 comprises two distinct elements, more specifically a plate 42 and a box 44. The plate 42, the box 44 and the device 16 of length conversion wave are shown in exploded perspective in Figure 2. The housing 44 is shown from the back in Figure 3.
    The plate 42 and the housing 44 are assembled to each other, for example by screwing. The plate 36 of the device 16 is held between the plate 42 and the housing 44 along the axis 23, the phosphor layer 38 being oriented towards the plate 42.
    The plate 42 has a substantially parallelepipedal shape with walls respectively arranged in planes (X, Y), (X, Z) and (Y, Z).
    The plate 42 comprises in particular a front opening 48 and a rear opening 50, respectively formed in each of the two walls arranged along (Y, Z). The plate 42 is assembled to the optical system 18 at the front opening 48.
    The plate 42 is further assembled to the plate 36 of the wavelength conversion device 16 at the rear opening 50.
    The plate 42 also has an upper opening 52 and a lower opening 54, respectively formed in each of the two walls arranged along (X, Y). The plate 42 is connected to each of the first 12 and second 14 luminous devices, respectively at the upper opening 52 and the lower opening 54. Each of the upper 52 and lower 54 openings is disposed opposite the the lateral orifice 34 of the envelope 30 of the light device 12, 14.
    The housing 44 also has a substantially parallelepiped shape. The housing 44 comprises in particular a bottom 60 disposed along (Y, Z), and lateral outer walls respectively arranged along (X, Y) and (X, Z).
    Furthermore, the housing 44 has two internal walls 62, 64, disposed on either side of a plane of symmetry (X, Y) of said housing, said plane of symmetry passing through the optical axis 23. The inner walls 62, 64 rest on the lateral outer walls arranged along (X, Z) of the housing 44.
    The internal walls 62, 64 divide the inside of the housing 44 into three separate ducts 66, 68 and 70, isolated from each other and contiguous along Z. In particular, the housing 44 comprises a central duct 68 and two lateral ducts 66 and 70.
    The bottom 60 of the housing 44 has three openings 72, 74 and 76, contiguous to Z. Each of said openings forms an inlet of a duct, respectively 66, 68 and 70. The fan 20 is assembled at the bottom 60 so as to cover the openings 72, 74 and 76. Thus, an air flow generated by the fan 20 is distributed between the three separate ducts 66, 68 and 70.
    The radiator 32 of each of the light devices 12, 14 is disposed inside the housing 44, in one of the two lateral ducts 66 and 70. Thus, an air flow passing through each lateral duct is able to cool a diode 24 via the corresponding radiator 32.
    The plate 36 of the conversion device 16 of wavelength conversion is disposed at the outlet of the central duct 68, in contact with the edges of the inner walls 62, 64, opposite to the opening 74. Preferably, the casing 44 comprises holes 80 near the plate 36, to form an air outlet of the central duct 68.
    Thus, an air flow passing through said central duct 68 is able to cool the plate 36.
    Preferably, the position of the inner walls 62, 64 is configured so as to direct on the plate 36 of the conversion device 16 a fraction of between 10% and 40%, preferably between 15% and 25%, of the air flow rate generated. by the fan 20. Each radiator 32 thus receives between 30% and 45% of said air flow.
    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 26 which forms a scanning system. Several points of the phosphor layer 38 thus successively receive the laser radiation of the diode 24.
    In known manner, each point of the layer 38, 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 light spots of the phosphor layer 38, in the form of a light beam able to illuminate the road ahead of a vehicle.
    The wavelength conversion process causes heating of the plate 36 of the conversion device 16. Moreover, the heat diffused by each diode 24 is dissipated in the corresponding radiator 32.
    The fan 20 generates a flow of air distributed in three separate streams in each of the ducts 66, 68 and 70. Each of said air flows cools the plate 36 or one of the radiators 32, avoiding overheating of the module 10.
    The shape of the housing 44 allows the formation in parallel of three separate air flows from a single fan 20. It is thus possible to modulate the amount of air directed on each of the elements of the module 10 may heat up. during operation.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1, - Lighting module (10) for a motor vehicle headlamp, comprising: - at least a first light source (12, 24); a device (16) for converting the wavelength of the light emitted by said first light source; and - a fan (20) capable of generating an air flow; the lighting module being characterized in that it comprises at least a first (66) and a second (68) separate air ducts, the fan being placed at the inlet (72, 74) of each of said first and second ducts of air so as to distribute the air flow between said ducts, the first light source and the wavelength conversion device being respectively disposed at the outlet of the first and second air ducts.
    [2" id="c-fr-0002]
    2, - lighting module according to claim 1, comprising at least a second light source (14), the conversion device being adapted to receive the light emitted by said second light source, said lighting module comprising at least a third an air duct (70) separate from the first and second air ducts, the fan being placed at the inlet (76) of said third air duct so as to distribute the flow of air between said ducts, the second light source being disposed at the outlet of said third air duct.
    [3" id="c-fr-0003]
    3, - lighting module according to claim 1 or claim 2, comprising a support (22, 42, 44) to which are attached the fan, the wavelength converting device, the first and optionally the second source ( s), said support comprising one or internal wall (s) (62, 64) defining the air ducts (66, 68, 70).
    [4" id="c-fr-0004]
    4, - lighting module according to one of the preceding claims, wherein the air ducts (66, 68, 70) are configured so as to direct on the wavelength conversion device (16) a fraction between 10% and 40%, preferably between 15% and 25%, of the air flow generated by the fan.
    [5" id="c-fr-0005]
    5, - lighting module according to one of the preceding claims, wherein at least the first light source (12, 14) is in contact with a radiator (32) capable of exchanging heat with a flow of air said radiator being disposed in the air duct (66, 70) corresponding to said light source.
    [6" id="c-fr-0006]
    6, - lighting module according to one of the preceding claims, wherein at least the first light source (12, 14) is a semiconductor light source, preferably a laser diode (24), emitting radiation of which the wavelength is preferably between 400 nm and 500 nm.
    [7" id="c-fr-0007]
    7, - lighting module according to one of the preceding claims, wherein the device (16) for converting wavelength comprises a plate (36) reflecting the laser radiation and a layer (38) of phosphor covering said plate .
    [8" id="c-fr-0008]
    8, - lighting module according to one of the preceding claims, further comprising at least one reflector device (26) adapted to deflect the light emitted by at least the first light source and return said light to the conversion device of wave length.
    [9" id="c-fr-0009]
    9, - lighting module according to one of the preceding claims, further comprising an optical imaging system (18) adapted to project the light re-emitted by the wavelength conversion device.
    [10" id="c-fr-0010]
    10, - Motor vehicle headlight, comprising at least one lighting module (10) according to one of the preceding claims.
    类似技术:
    公开号 | 公开日 | 专利标题
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    JP5553708B2|2014-07-16|Lighting device and heat sink thereof
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    FR3062455A1|2018-08-03|MOTOR VEHICLE PROJECTOR MULTI-SOURCE LIGHTING MODULE AND PROJECTOR
    同族专利:
    公开号 | 公开日
    CN106813184B|2021-08-10|
    US10309636B2|2019-06-04|
    CN106813184A|2017-06-09|
    EP3173684A1|2017-05-31|
    US20170153002A1|2017-06-01|
    FR3044393B1|2019-04-26|
    引用文献:
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    FR2946730A1|2009-06-16|2010-12-17|Valeo Vision|Lighting or signaling device i.e. headlight, for motor vehicle, has pipe provided in aeraulic communication with generating apparatus to transfer flow of air toward heat exchanging surface|
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    FR2993831B1|2012-07-27|2015-07-03|Valeo Vision|ADAPTIVE LIGHTING SYSTEM FOR MOTOR VEHICLE|
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    FR3068111B1|2017-06-23|2020-09-04|Valeo Vision|LIGHT MODULE FOR MOTOR VEHICLES|
    KR102134329B1|2017-09-20|2020-07-16|가부시키가이샤 고이토 세이사꾸쇼|Vehicle lamp|
    CN108662551B|2018-05-14|2020-03-13|安徽卡澜特车灯科技有限公司|Projection type double-light lens|
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    CN111692573B|2019-09-30|2022-02-25|长城汽车股份有限公司|Lighting device and vehicle|
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    FR3104681A1|2019-12-11|2021-06-18|Valeo Vision|Vehicle lighting device|
    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
    FR1561525|2015-11-27|
    FR1561525A|FR3044393B1|2015-11-27|2015-11-27|MOTOR VEHICLE PROJECTOR LIGHTING MODULE AND PROJECTOR|FR1561525A| FR3044393B1|2015-11-27|2015-11-27|MOTOR VEHICLE PROJECTOR LIGHTING MODULE AND PROJECTOR|
    EP16200007.9A| EP3173684A1|2015-11-27|2016-11-22|Lighting module of a motor vehicle headlight and associated headlight|
    US15/359,846| US10309636B2|2015-11-27|2016-11-23|Motor vehicle headlight lighting module with wavelength converter and separate air ducts for cooling|
    CN201611063471.2A| CN106813184B|2015-11-27|2016-11-25|Motor vehicle headlamp lighting module and associated headlamp|
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