• 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 invention relates to an optical module (10) for a motor vehicle comprising: - a light source (16); - a radiator (22) comprising a plate (24) having a front face (26) for supporting the light source (16) and having a rear face (28) bristling with fins (30) for cooling; - A device (42) for producing an air flow; characterized in that the radiator (22) has at least one vent (40) which passes through the radiator plate (24) near the light source (16) to allow the flow of air to flow longitudinally between the front and the back of the radiator.
    公开号:FR3064049A1
    申请号:FR1752171
    申请日:2017-03-16
    公开日:2018-09-21
    发明作者:Vanesa SANCHEZ；Lotfi Redjem Saad；Eric MORNET；Francois Berrezai
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION
    The invention relates to an optical module for a motor vehicle comprising:
    - a light source;
    - A radiator comprising a plate having a front face for supporting the light source and comprising a rear face bristling with cooling fins;
    - a device for producing an air flow.
    TECHNICAL BACKGROUND OF THE INVENTION
    Light-emitting diodes are increasingly used as a light source for optical modules in motor vehicles.
    During operation, these light emitting diodes radiate heat. The heat produced by the light-emitting diodes can damage certain elements of the optical module. This problem is all the more sensitive since the light sources are generally housed in confined spaces.
    It is therefore known to arrange a finned radiator on the back of the light-emitting diodes to dissipate the heat. To improve the cooling of light-emitting diodes, it is known to circulate a flow of cooling air between the fins, for example by means of a fan.
    If this solution is satisfactory in most configurations, it is however not sufficient when the light source is confined in a particularly cramped housing and / or when elements vulnerable to heat are arranged in the immediate vicinity of the light source, for example. example within 1 mm of the light source.
    BRIEF SUMMARY OF THE INVENTION
    The invention provides an optical module of the type described above, characterized in that the radiator has at least one vent which passes through the radiator plate near the light source to allow the air flow to circulate longitudinally between the front and the rear. of the radiator. The direction of the air flow can be either from the light source to the fins or from the fins to the light source.
    The vent thus creates an air movement near the light source. This is to prevent air from stagnating on contact with the light source and from heating up to a temperature which could damage elements of the optical module. The air circulation will, on the contrary avoid the creation of pockets of hot air.
    According to other characteristics of the invention:
    the light source is formed by at least one light-emitting diode arranged on a printed circuit board, the printed circuit board being pressed against the front face of the radiator;
    - the light source comprises a matrix of light-emitting diodes;
    - The printed circuit board has at least one passage window arranged facing the at least one vent; This makes it possible in particular to bring the air flow as close as possible to the light source; the vent is advantageously positioned so that the air flow produces a suction of air close to the light-emitting diodes, for example by Venturi effect;
    - Each vent is capped with at least one deflector which one mouth is open towards the light source generally parallel to the front face of the radiator; this allows the air flow to be directed more precisely towards the light source;
    - the deflector is made integrally with the radiator;
    - the deflector is an attachment to the radiator;
    the optical module comprises a primary optical element which is arranged near the light source, a gap being reserved between the light source and the primary optical element;
    - Each deflector is extended by a guide wall to guide the air flow to the gap; this makes it possible to use almost all of the air flow to specifically cool the light source;
    - The guide wall is made integrally with the primary optical element;
    the device for producing the air flow produces an air flow directed from the vent to the light source; advantageously, the air circulates quickly enough so that the air arriving on the vent has practically not cooled the fins, the air thus remaining cold;
    - The device for producing the air flow produces an air flow which is directed from the light source to the at least one vent;
    - The radiator has two vents which are arranged on either side of the light source.
    BRIEF DESCRIPTION OF THE FIGURES
    Other characteristics and advantages of the invention will appear during the reading of the detailed description which will follow for the understanding of which reference will be made to the appended drawings in which:
    - Figure 1 is a perspective view which represents an optical module implementing a first embodiment of the invention;
    - Figure 2 is a perspective view which shows light emission means of the module of Figure 1;
    - Figure 3 is a perspective view which shows a radiator of the optical module of Figure 1;
    - Figure 4 is a perspective view on a larger scale which represents a primary optical element of the optical module of Figure 1 which is intended to be arranged in the immediate vicinity of the light source;
    - Figure 5 is a sectional view along the section plane 5-5 of Figure 6 which shows the optical module comprising the radiator provided with vents made according to the first embodiment of the invention;
    - Figure 6 is a perspective view which shows the front face of the radiator on which are mounted a printed circuit board and the primary optical element;
    - Figure 7 is a perspective view which shows a rear face of the radiator of Figure 5 equipped with a fan;
    - Figure 8 is a view similar to that of Figure 5 which shows a second embodiment of the invention.
    DETAILED DESCRIPTION OF THE FIGURES
    In the following description, the following guidelines will be adopted without limitation:
    - Longitudinal L oriented from back to front along the optical axis of the optical projection of the optical module;
    - transverse T oriented from left to right;
    - vertical V oriented from bottom to top.
    The vertical orientation V is used as a geometric reference without relation to the direction of gravity.
    In the following description, elements having an identical structure and / or analogous functions will be designated by the same references.
    FIG. 1 shows an optical module 10 which is intended to equip a lighting or signaling device for a motor vehicle. The optical module 10 is intended to emit a final light beam longitudinally forward.
    By way of nonlimiting example, it is here an adaptive light beam which is composed of a plurality of overlapping elementary beams. Such an optical module 10 is in particular capable of fulfilling an adaptive high beam function, also known under the name ADB for Adaptive Driving Beam, or it is also capable of fulfilling a function of directional lighting light, also known as 'DBL designation for Dynamic Bending Light.
    The optical module 10 mainly comprises light emission means 12 and a projection optic 14 which is arranged longitudinally in front and at a distance from the emission means 12. The projection optic 14 has a longitudinal optical axis A
    In a variant not shown of the invention, the lighting device also comprises a second dipped beam module which is capable of emitting a single dipped beam.
    As shown in more detail in Figure 2, the light emitting means 12 here comprise a light source 16. The light source 16 is formed by at least one light-emitting diode 18 arranged on a printed circuit board 20. The printed circuit board 20 extends in a transverse vertical plane.
    The light source 16 is here formed by a matrix of light-emitting diodes 18. The matrix is equipped with two transverse rows of seventeen light-emitting diodes 18. The optical axis A passes substantially in the middle of the matrix in the transverse direction. The light-emitting diodes 18 are all arranged on said printed circuit board 20.
    The matrix extends in a plane orthogonal to the longitudinal direction L. More particularly, the light-emitting diodes 18 are carried by the front face of the printed circuit board 20.
    The light-emitting diodes 18 can here be controlled independently of each other.
    As a variant, the light-emitting diodes 18 are controlled in dependence on one another, for example in groups of two.
    These light-emitting diodes 18 are capable of emitting heat during their operation. The optical module 10 therefore includes a radiator 22 for removing some of the heat by conduction. The radiator 22 is shown in more detail in FIG. 3.
    The radiator 22 comprises a vertical transverse plate 24 having a front face 26 for supporting the light source 16 and a rear face 28. The radiator 22 also includes cooling fins 30 which bristle the rear face 28 of the plate 24.
    The back of the printed circuit board 20 is pressed against the front face 26 of the radiator 22 so as to transmit part of the heat produced by conduction to the radiator 22. A layer of thermal paste (not shown) is for example crushed between the printed circuit board 20 and the front face 26 of the radiator 22 to promote heat exchange between the printed circuit board 20 and the radiator 22. The printed circuit board 20 is more particularly arranged against a central zone of the front face 26 of the radiator 22 in order to promote its cooling.
    The cooling fins 30 make it possible to increase the exchange surface between the radiator 22 and the air outside the optical module 10. The cooling fins 30 extend longitudinally from the rear face 28 of the plate 24. It s acts in a nonlimiting manner of parallel transverse fins 30.
    The optical module 10 comprises a first primary optical element 32 which is arranged longitudinally in front of the matrix 16 of light-emitting diodes 18 to modify the distribution of the light rays emitted by the light-emitting diodes 18.
    As shown in Figure 4, the primary optical element 32 here has a rear portion which is formed of a plurality of light guides 34. Each light guide 34 extends along a main longitudinal axis from an entry face 36 of the light rays, to a front portion of the primary optical element 32. Each light guide 34 is designed to guide the incoming rays by the input faces 36 to the front portion of the primary optical element 32.
    The primary optical element 32 comprises a matrix of at least as many light guides 34 as the matrix 16 comprises light-emitting diodes 18. Each light guide 34 is associated with a light-emitting diode 18.
    The entry faces 36 of the light guides 34 are arranged in a common plane which is parallel to the plane of the printed circuit board 20. When the primary optical element 32 is arranged in the optical module 10, as shown in FIGS. Figures 5 and 6, each input face 36 is thus positioned longitudinally opposite a light emitting diode 18 associated so that most of the light rays emitted by each light emitting diode 18 enters the light guide 34 associated.
    Each input face 36 is more particularly arranged at a short longitudinal distance from the associated light-emitting diode 18, for example less than 1 mm, or even less than 0.5 mm. A gap 38 is thus reserved longitudinally between each light-emitting diode 18 and the primary optical element 32.
    In such a context, the air confined in the gap 38 between the matrix of light-emitting diodes 18 and the primary optical element 32 is heated by the radiation of the light-emitting diodes 18. Because of the small dimensions of the gap 38, the air thus confined does not renew itself and continues to heat up. The radiator 22 does not allow enough heat to be removed to cool the confined air.
    In particular, it has been found that, in certain cases, the air could heat up to reach a critical temperature which is high enough to alter the physical integrity of the material constituting the primary optical element 32. This is for example the case when the primary optical element 32 is made of silicone and the temperature exceeds the critical temperature, for example 1 00 ° C.
    To solve this problem and evacuate the hot air confined in the gap 38, the invention proposes a radiator 22 comprising at least one vent 40 which passes through the plate 24 of the radiator 22 near the light source 16. The vent 40 takes the form of an orifice which crosses the plate 24 right through in the thickness direction and which opens out between two fins 30.
    The optical module 10 also comprises a device 42 for producing an air flow which makes it possible to make a longitudinal flow of an air flow through the vent 40 between the rear face 28 and the front face 26 of the radiator 22. The circulation of air makes it possible to create a forced convection movement which makes it possible to at least partially renew the air included in the gap 38. Such a device 42 will be described in more detail below.
    For example, the vents 40 are positioned so that the air flow produces a suction of the air close to the light-emitting diodes using for example the Venturi effect.
    The radiator 22 is made in one piece, for example by molding. It is made of a heat conductive and rigid material, such as a metallic material, for example steel. The vent 40 can be produced directly during molding or by machining the radiator 22.
    Each vent 40 is here produced in a central region of the radiator 22 so as to be located near the light-emitting diodes 18. So that the vents 40 are arranged as close as possible to the matrix of light-emitting diodes 18, in the example shown in the FIG. 6, the printed circuit board 20 has at least one passage window 43 arranged opposite the at least one vent 40. Thus, the air flow opens as close as possible to the light-emitting diodes 18, passing through the printed circuit board 20.
    Furthermore, to promote the mixing of air in the gap 38, it is provided that each vent 40 is capped with at least one deflector 44, one mouth 46 of which is open in the direction of the light source 16 generally parallel to the front face 26 of the radiator 22. Thus, the movement of air in the vent 40 will induce an air movement parallel to the front face 26 of the radiator 22 up to the gap 38.
    There is shown in Figures 5, a first embodiment of the invention. The matrix of light-emitting diodes 18 has a length which extends transversely on the printed circuit board 20. Two vents are arranged vertically on either side of the matrix.
    ίο
    Each vent 40 has, in section, a transversely elongated shape. The length of the section of each vent 40 is at least equal to the length of the zone to be cooled.
    Alternatively, several shorter section vents are arranged on each side of the zone to be cooled.
    In the present case, only the middle zone of the matrix of light-emitting diodes 18 is capable of reaching the critical temperature. Each vent 40 therefore has a section of length less than that of the matrix, but greater than that of the middle zone to be cooled.
    Each vent 40 advantageously has a passage section whose area is limited to a few square millimeters to allow the acceleration of the air during its passage through the vent 40 by Bernoulli effect. The width of the section is for example between 1 and 4 mm.
    The air flow here is produced by a fan 42 which is arranged against the free end of the fins 30, as shown in Figures 5 and 7. Thus, a first part of the air flow produced by the fan 42 allows to participate in the cooling of the fins 30, while a second part of the air flow enters the vents 40 to open out near the light-emitting diodes 18.
    Advantageously, the second part of the air flow directed towards the vents 40 circulates so as to practically not cool the fins 30. Thus, the air which enters the vents 40 is practically not heated by the fins 30.
    As shown in FIG. 5, the faces of the fins 30 which border the vents 40 advantageously have a shape which guides part of the air flow in the direction of the vents 40 to promote the speed of flow of the air in the vents 40 In the example shown in FIG. 5, the walls of each vent 40 thus extend the guide face of the associated fins 30, without the presence of a step or shoulder liable to disturb the flow of air.
    Each vent 40 is capped with a deflector 44 which directs the air flow vertically towards the gap 38. Each deflector 44 thus extends longitudinally projecting relative to the printed circuit board 20.
    The deflector 44 is here produced in one piece integrally with the radiator 22. In this case, the deflectors 44 pass through the windows 43 of the printed circuit board 20.
    As a variant, the deflector 44 is an added part. The deflector 44 is for example fixed on the printed circuit board 20.
    The device 42 for producing the air flow thus produces an air flow directed from the vent 40 towards the light source. The path of the air flow is indicated by the arrows in FIG. 5. The fresh air blown through each vent 40 by the fan 42 thus expels the hot air contained in the gap 38. This incessant convection movement allows thus maintaining the temperature of the middle zone of the light-emitting diodes 18 below the critical temperature, thus preserving the integrity of the primary optical element 32.
    A second embodiment of the invention has been shown in FIG. 8. The optical module 10 according to this second embodiment has many similarities with the optical module 10 produced according to the first embodiment. Only the differences, here relating to the deflectors 44, will be described below.
    Each deflector 44 is extended by a guide wall 48 until it is in contact with the primary optical element to conduct the air flow to the gap 38, as indicated by the arrows in FIG. 8. This allows almost all of the air flow passing through the vents 40 to enter the gap 38. The cooling effect is thus maximized.
    As for the first embodiment, the deflector 44 is for example made integrally with the radiator 22.
    As a variant, the deflector 44 is produced in an attached piece on the printed circuit board 20.
    The guide wall 48 is made integrally with the primary optical element 32.
    According to a variant not shown of this second embodiment, the deflector 44 and the guide wall 48 are produced in a single common part.
    According to another alternative embodiment of the invention which can be applied to either of the first two embodiments, the device 42 for producing an air flow, for example the fan 42, draws in the air through the vent 40. In this case, there is a suction effect of the hot air contained in the gap 38 through the mouth 46 of the deflector 44. The device 42 for producing the flow d air thus produces an air flow which is directed from the light source 16 to the at least one vent 40. This alternative embodiment is particularly effective when combined with the second embodiment.
    According to another variant not shown of the invention, the device 42 for producing an air flow is arranged so as to blow air directly in the direction of the gap 38, without passing through the vents 40. L the air actively set in motion on the side of the front face 26 of the radiator 22 is thus naturally evacuated by the vents 40.
    The optical module 10 produced according to the teachings of the invention thus makes it possible to effectively cool the primary optics by setting in motion the air contained in the gap 38.
    权利要求:
    Claims (13)
    [1" id="c-fr-0001]
    1. Optical module (10) for a motor vehicle comprising:
    - a light source (16);
    - A radiator (22) comprising a plate (24) having a front face (26) for supporting the light source (16) and comprising a rear face (28) bristling with cooling fins (30);
    - a device (42) for producing an air flow; characterized in that the radiator (22) has at least one vent (40) which passes through the radiator plate (24) near the light source (16) to allow the air flow to flow longitudinally between the front and the back of the radiator.
    [2" id="c-fr-0002]
    2. Optical module (10) according to the preceding claim, characterized in that the light source (16) is formed by at least one light-emitting diode (18) arranged on a printed circuit board (20), the printed circuit board ( 20) being pressed against the front face (26) of the radiator (22).
    [3" id="c-fr-0003]
    3. Optical module (10) according to the preceding claim, characterized in that the light source (16) comprises a matrix of light-emitting diodes (18).
    [4" id="c-fr-0004]
    4. Optical module (10) according to the preceding claim, characterized in that the printed circuit board (20) has at least one window (43) for passage arranged opposite the at least one vent (40).
    [5" id="c-fr-0005]
    5. Optical module (10) according to any one of the preceding claims, characterized in that each vent (40) is capped with at least one deflector (44) of which one mouth (46) is open in the direction of the light source (16) generally parallel to the front face (26) of the radiator (22).
    [6" id="c-fr-0006]
    6. Optical module (10) according to the preceding claim, characterized in that the deflector (44) is made integrally with the radiator (22).
    [7" id="c-fr-0007]
    7. Optical module (10) according to claim 5, characterized in that the deflector (44) is an insert on the radiator (22).
    [8" id="c-fr-0008]
    8. Optical module (10) according to any one of the preceding claims, characterized in that it comprises a primary optical element (32) which is arranged close to the light source (16), a gap (38) being reserved between the light source (16) and the primary optical element (32).
    [9" id="c-fr-0009]
    9. Optical module (10) according to the preceding claim, taken in combination with claim 5, characterized in that each deflector (44) is extended by a guide wall (48) to guide the air flow to the 'gap (38).
    [10" id="c-fr-0010]
    10. Optical module (10) according to the preceding claim, characterized in that the guide wall (48) is made integrally with the primary optical element (32).
    [11" id="c-fr-0011]
    11. Optical module (10) according to any one of the preceding claims, characterized in that the device (42) for producing the air flow produces an air flow directed from the vent (40) towards the light source (16).
    [12" id="c-fr-0012]
    12. Optical module (10) according to any one of claims 1 to 10, characterized in that the device (42) for producing the air flow produces an air flow which is directed from
    5 the light source (16) towards the at least one vent (40).
    [13" id="c-fr-0013]
    13. Optical module (10) according to any one of the preceding claims, characterized in that the radiator (22) has two vents (40) which are arranged on either side of the light source (16).
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    同族专利:
    公开号 | 公开日
    US10465877B2|2019-11-05|
    EP3376101B1|2019-12-11|
    EP3376101A1|2018-09-19|
    US20180266646A1|2018-09-20|
    FR3064049B1|2021-07-09|
    CN108626695A|2018-10-09|
    CN108626695B|2021-09-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1726874A1|2005-05-23|2006-11-29|Valeo Vision|LED Headlamp and/or signal lamp for automobiles|
    JP2008103195A|2006-10-19|2008-05-01|Matsushita Electric Works Ltd|Led lighting device|
    JP2010262903A|2009-05-11|2010-11-18|Koito Mfg Co Ltd|Vehicular lighting fixture|
    EP2733412A2|2012-11-20|2014-05-21|Koito Manufacturing Co., Ltd.|Vehicular lamp|
    WO2016110573A1|2015-01-09|2016-07-14|Valeo Vision|Optical module for vehicle headlight|
    EP3104063A1|2015-06-08|2016-12-14|Valeo Vision|Heat sink for lighting module, associated lighting module and lighting device|
    US7736026B2|2001-06-30|2010-06-15|Texas Instruments Incorporated|Lamp reflector cooling air deflector|
    US7427152B2|2005-12-05|2008-09-23|Visteon Global Technologies, Inc.|Headlamp assembly with integrated housing and heat sink|
    US20080212333A1|2007-03-01|2008-09-04|Bor-Jang Chen|Heat radiating device for lamp|
    JP5457061B2|2009-04-01|2014-04-02|株式会社小糸製作所|Vehicle headlamp|
    JP2011048923A|2009-08-25|2011-03-10|Stanley Electric Co Ltd|Lighting fixture for vehicle|
    CN103124876B|2010-08-06|2016-02-03|普司科Ict股份有限公司|Optical semiconductor lighting apparatus|
    US8899803B2|2011-11-04|2014-12-02|Truck-Lite, Co., Llc|Headlamp assembly having a heat sink structure and wire heating element for removing water based contamination|
    US8931925B2|2012-01-09|2015-01-13|Tai-Her Yang|LED heat dissipation device having axial and radial convection holes|
    JP2018142595A|2017-02-27|2018-09-13|パナソニックＩｐマネジメント株式会社|Light source module, lighting system, and movable body|DE102018102156A1|2018-01-31|2019-08-01|Automotive Lighting Reutlingen Gmbh|Light generation arrangement and motor vehicle light|
    JP2020095878A|2018-12-13|2020-06-18|市光工業株式会社|Vehicular lighting fixture|
    US11034292B2|2019-07-31|2021-06-15|Ford Global Technologies, Llc|Vehicle grille assembly|
    法律状态:
    2018-03-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-09-21| PLSC| Publication of the preliminary search report|Effective date: 20180921 |
    2020-03-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-03-30| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1752171A|FR3064049B1|2017-03-16|2017-03-16|OPTICAL MODULE INCLUDING A RADIATOR EQUIPPED WITH A VENT|
    FR1752171|2017-03-16|FR1752171A| FR3064049B1|2017-03-16|2017-03-16|OPTICAL MODULE INCLUDING A RADIATOR EQUIPPED WITH A VENT|
    EP18161581.6A| EP3376101B1|2017-03-16|2018-03-13|Optical module comprising a radiator provided with a vent|
    CN201810219983.6A| CN108626695B|2017-03-16|2018-03-16|Optical module comprising a heat sink provided with a vent|
    US15/923,196| US10465877B2|2017-03-16|2018-03-16|Optical module including a heat sink equipped with a vent|
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