EP3376101B1 - Optical module comprising a radiator provided with a vent - Google Patents
Optical module comprising a radiator provided with a vent Download PDFInfo
- Publication number
- EP3376101B1 EP3376101B1 EP18161581.6A EP18161581A EP3376101B1 EP 3376101 B1 EP3376101 B1 EP 3376101B1 EP 18161581 A EP18161581 A EP 18161581A EP 3376101 B1 EP3376101 B1 EP 3376101B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical module
- radiator
- light source
- light
- vent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011159 matrix material Substances 0.000 claims description 15
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- 230000033001 locomotion Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
- F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/151—Light emitting diodes [LED] arranged in one or more lines
- F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/42—Forced cooling
- F21S45/43—Forced cooling using gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
- F21V29/673—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans the fans being used for intake
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/24—Light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
- F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
- F21S43/14—Light emitting diodes [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/235—Light guides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
- F21Y2105/12—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
Definitions
- the invention relates to an optical module for a motor vehicle according to claim 1.
- Light-emitting diodes are increasingly used as a light source for optical modules of motor vehicles.
- these light emitting diodes radiate heat.
- the heat produced by the light-emitting diodes is likely to damage certain elements of the optical module. This problem is all the more sensitive as the light sources are generally housed in confined areas.
- EP2733412A2 discloses an optical module according to the preamble of claim 1.
- the invention proposes an optical module of the type described above, remarkable in that the radiator comprises at least one vent that passes through the radiator plate near the light source to allow the flow of air to flow longitudinally between the front and the back 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 prevents stagnant air in contact with the light source and heats up to a temperature that may damage elements of the optical module. Air mixing will, on the contrary, prevent the creation of pockets of hot air.
- the vertical orientation "V" is used as a geometrical reference unrelated to the direction of gravity.
- FIG. 1 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 forwards.
- this is an adaptive light beam which is composed of a plurality of overlapping elementary beams.
- Such an optical module 10 is particularly capable of performing an adaptive driving beam function, also known by the name "ADB” for “Adaptive Driving Beam”, or it is also capable of performing a directional lighting function, also known as "DBL” for “Dynamic Bending Light”.
- ADB adaptive driving beam function
- DBL directional lighting function
- the optical module 10 mainly comprises means 12 for transmitting light and a projection optic 14 which is arranged longitudinally in front and at a distance from the transmission means 12.
- the projection optic 14 has a longitudinal optical axis "A"
- the lighting device further comprises a second dipped-beam module which is able to emit a single passing beam.
- the light emission 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 "A" axis 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 one another.
- the light-emitting diodes 18 are controlled in a manner dependent on each other, for example in groups of two.
- the optical module 10 therefore comprises a radiator 22 for discharging part of the heat by conduction.
- the radiator 22 is shown in more detail at figure 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 comprises cooling fins 30 which bristle the rear face 28 of the plate 24.
- the back of the circuit board 20 is pressed against the front face 26 of the radiator 22 so as to transmit a portion of the heat produced by conduction to the radiator 22.
- a layer of thermal paste (not shown) is for example crushed between the circuit board 20 and the front face 26 of the radiator 22 to promote the heat exchange between the printed circuit board 20 and the radiator 22.
- the printed circuit board 20 is more particularly arranged against a zone central of the front face 26 of the radiator 22 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. acts in a non-limiting manner with parallel transverse fins.
- 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.
- the primary optical element 32 here comprises a rear portion which is formed of a plurality of light guides 34.
- Each light guide 34 extends along a principal longitudinal axis from an input 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 input 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.
- each inlet face 36 is thus positioned longitudinally opposite a light-emitting diode 18 associated so that the major part of the light rays emitted by each light-emitting diode 18 enters the guide 34 of associated light.
- 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.
- 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 warm up.
- the radiator 22 does not allow to evacuate enough heat to cool the confined air.
- the air can 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.
- a critical temperature which is high enough to alter the physical integrity of the material constituting the primary optical element 32.
- the primary optical element 32 is made of silicone and the temperature exceeds the critical temperature, for example 100 ° C.
- the invention provides a radiator 22 having at least one vent 40 which passes through the plate 24 of the radiator 22 near the light source 16.
- the vent 40 is in the form of an orifice which passes through the plate 24 from one side to the other in the direction of the thickness and which opens between two fins 30.
- the optical module 10 further comprises a device 42 for producing an air flow which makes it possible to cause a flow of air to flow longitudinally through the vent 40 between the rear face 28 and the front face 26 of the radiator 22.
- Air circulation allows to create a forced convection movement that renews at least partially the air in the gap 38.
- a device 42 will be described in more detail later.
- vents 40 are positioned so that the airflow produces 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 made directly during molding or by machining the radiator 22.
- Each vent 40 is here made in a central zone of the radiator 22 so as to be located close to the light-emitting diodes 18.
- the printed circuit board 20 has at least one passage window 43 arranged facing the at least one vent 40.
- the air flow opens as close as possible to the light-emitting diodes 18, passing through the circuit board. printed circuits 20.
- each vent 40 is capped with at least one deflector 44, a mouth 46 is open towards the light source 16 generally parallel to the front face 26 of the radiator 22.
- the displacement of air in the vent 40 will induce a movement of air parallel to the front face 26 of the radiator 22 to the gap 38.
- the matrix of light-emitting diodes 18 has a length that extends transversely on the printed circuit board 20.
- Two vents 40 are arranged vertically on either side of the matrix.
- Each vent 40 has, in section, an elongated shape transversely. The length of the section of each vent 40 is at least equal to the length of the zone to be cooled.
- vents of smaller section are arranged on each side of the area to be cooled.
- each vent 40 therefore has a section of length less than that of the matrix, but greater than that of the central 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 flow of air is produced here by a fan 42 which is arranged against the free end of the fins 30, as shown in FIGS. figures 5 and 7 .
- a first part of the air flow produced by the fan 42 makes it possible to participate in the cooling of the fins 30, while a second part of the air flow enters the vents 40 to open near the light-emitting diodes 18.
- the second part of the air flow directed towards the vents 40 circulates in such a way as to substantially not cool the fins 30.
- the air entering the vents 40 is hardly heated by the fins 30.
- the faces of the fins 30 which line the vents 40 advantageously have a shape that guides a portion of the air flow towards the vents 40 to promote the air flow rate in the vents 40.
- the walls of each vent 40 thus extend the guide face of the associated fins 30, without any recess or shoulder likely to disturb the flow of air.
- Each vent 40 is capped with a deflector 44 which directs the flow of air vertically towards the gap 38.
- Each deflector 44 thus extends longitudinally projecting with respect to the printed circuit board 20.
- the deflector 44 is here made 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.
- the deflector 44 is an insert.
- 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 airflow is indicated by the arrows of the figure 5 .
- the fresh air blown through each vent 40 by the fan 42 thus flushes the hot air contained in the gap 38.
- This incessant convection movement thus makes it possible to maintain the temperature of the central 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 at figure 8 .
- the optical module 10 according to this second embodiment has many similarities with the optical module 10 made according to the first embodiment. Only the differences, here concerning the deflectors 44, will be described later.
- Each deflector 44 is extended by a guide wall 48 until it comes into contact with the primary optical element 32 to conduct the flow of air to the gap 38, as indicated by the arrows in FIG. figure 8 . This allows almost all the flow of air passing through the vents 40 to enter the gap 38. The cooling effect is maximized.
- the deflector 44 is for example made integral with the radiator 22.
- the deflector 44 is made in a piece on the printed circuit board 20.
- the guide wall 48 is formed integrally with the primary optical element 32.
- the deflector 44 and the guide wall 48 are made in a single common room.
- the device 42 for producing an air flow for example the fan 42, aspires to the air through the vent 40.
- the device 42 for producing the flow of air The air thus produces a flow of air which is directed from the light source 16 to the at least one vent 40.
- This variant embodiment is particularly effective when combined with the second embodiment.
- the device 42 for producing an air flow is arranged to blow air directly towards the gap 38, without passing through the vents 40. Air actively set in motion on the side of the front face 26 of the radiator 22 is 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 putting in motion the air contained in the gap 38.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Description
L'invention concerne un module optique pour véhicule automobile selon la revendication 1.The invention relates to an optical module for a motor vehicle according to claim 1.
Les diodes électroluminescentes sont de plus en plus utilisées comme source lumineuse des modules optiques de véhicules automobiles.Light-emitting diodes are increasingly used as a light source for optical modules of motor vehicles.
Lors de leur fonctionnement, ces diodes électroluminescentes irradient de la chaleur. La chaleur produite par les diodes électroluminescentes est susceptible d'endommager certains éléments du module optique. Ce problème est d'autant plus sensible que les sources lumineuses sont généralement logées dans des endroits confinés.During their operation, these light emitting diodes radiate heat. The heat produced by the light-emitting diodes is likely to damage certain elements of the optical module. This problem is all the more sensitive as the light sources are generally housed in confined areas.
Il est donc connu de d'agencer un radiateur à ailettes au dos des diodes électroluminescentes pour en évacuer la chaleur. Pour améliorer le refroidissement des diodes électroluminescentes, il est connu de faire circuler un flux d'air de refroidissement entre les ailettes, par exemple au moyen d'un ventilateur.It is therefore known to arrange a finned radiator on the back of the light emitting diodes to evacuate the heat. To improve the cooling of the light-emitting diodes, it is known to circulate a flow of cooling air between the fins, for example by means of a fan.
Si cette solution est satisfaisante dans la plupart des configurations, elle n'est cependant pas suffisante lorsque la source lumineuse est confinée dans un logement particulièrement exigu et/ou lorsque des éléments vulnérables à la chaleur sont agencés à proximité immédiate de la source lumineuse, par exemple à moins de 1 mm de la source lumineuse.Although this solution is satisfactory in most configurations, it is not sufficient when the light source is confined to a particularly confined space and / or when elements vulnerable to heat are arranged in close proximity to the light source, for example within 1 mm of the light source.
Le document
L'invention propose un module optique du type décrit précédemment, remarquable en ce que le radiateur comporte au moins un évent qui traverse la plaque du radiateur à proximité de la source lumineuse pour permettre au flux d'air de circuler longitudinalement entre l'avant et l'arrière du radiateur. La direction du flux d'air peut être soit depuis la source lumineuse vers les ailettes ou depuis les ailettes vers la source lumineuse.The invention proposes an optical module of the type described above, remarkable in that the radiator comprises at least one vent that passes through the radiator plate near the light source to allow the flow of air to flow longitudinally between the front and the back 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.
L'évent permet ainsi de créer un mouvement d'air à proximité de la source lumineuse. Cela permet d'éviter que de l'air stagne au contact de la source lumineuse et ne s'échauffe jusqu'à une température risquant d'endommager des éléments du module optique. Le brassage de l'air va, au contraire éviter la création de poches d'air chaud.The vent thus creates an air movement near the light source. This prevents stagnant air in contact with the light source and heats up to a temperature that may damage elements of the optical module. Air mixing will, on the contrary, prevent the creation of pockets of hot air.
Selon d'autres caractéristiques de l'invention :
- la source lumineuse est formée par au moins une diode électroluminescente agencée sur une carte à circuits imprimés, la carte à circuits imprimés étant plaquée contre la face avant du radiateur ;
- la source lumineuse comporte une matrice de diodes électroluminescentes ;
- la carte à circuits imprimés présente au moins une fenêtre de passage agencée en regard de l'au moins un évent ; Ceci permet notamment d'amener le flux d'air au plus près de la source lumineuse ; l'évent est avantageusement positionné de manière à ce que le flux d'air produise une aspiration de l'air proche des diodes électroluminescentes, par exemple par effet Venturi ;
- chaque évent est coiffé d'au moins un déflecteur qui dont une bouche est ouverte en direction de la source lumineuse globalement parallèlement à la face avant du radiateur ; cela permet de diriger le flux d'air plus précisément vers la source lumineuse ;
- le déflecteur est réalisé venu de matière avec le radiateur ;
- le déflecteur est une pièce rapportée sur le radiateur ;
- le module optique comporte un élément optique primaire qui est agencé à proximité de la source lumineuse, un interstice étant réservé entre la source lumineuse et l'élément optique primaire ;
- chaque déflecteur est prolongé par une paroi de guidage pour guider le flux d'air jusqu'à l'interstice ; cela permet d'utiliser la quasi-totalité du flux d'air pour refroidir spécifiquement la source lumineuse ;
- la paroi de guidage est réalisée venue de matière avec l'élément optique primaire ;
- le dispositif de production du flux d'air produit un flux d'air dirigé depuis l'évent vers la source lumineuse ; avantageusement, l'air circule suffisamment rapidement pour que l'air arrivant sur l'évent n'ai pratiquement pas refroidi les ailettes, l'air demeurant ainsi froid ;
- le dispositif de production du flux d'air produit un flux d'air qui est dirigé depuis la source lumineuse vers l'au moins un évent ;
- le radiateur comporte deux évents qui sont agencés de part et d'autre de la source lumineuse.
- 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 allows in particular to bring the airflow closer to the light source; the vent is advantageously positioned so that the airflow produces suction of the air close to the light-emitting diodes, for example by the Venturi effect;
- each vent is capped with at least one deflector which a mouth is open towards the light source generally parallel to the front face of the radiator; this makes it possible to direct the flow of air more precisely towards the light source;
- the deflector is made integrally with the radiator;
- the baffle is a patch on the radiator;
- the optical module comprises a primary optical element which is arranged close to 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 flow of air to the gap; this makes it possible to use almost all the air flow to specifically cool the light source;
- the guide wall is formed integrally with the primary optical element;
- the device for producing the air flow produces a flow of air directed from the vent to the light source; advantageously, the air circulates rapidly enough so that the air arriving on the vent have not substantially cooled the fins, the air thus remaining cold;
- the air flow generating device produces a flow of air which is directed from the light source to the at least one vent;
- the radiator comprises two vents which are arranged on either side of the light source.
D'autres caractéristiques et avantages de l'invention apparaitront au cours de la lecture de la description détaillée qui va suivre pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :
- la
figure 1 est une vue en perspective qui représente un module optique mettant en œuvre une premier mode de réalisation de l'invention ; - la
figure 2 est une vue en perspective qui représente des moyens d'émission de lumière du module de lafigure 1 ; - la
figure 3 est une vue en perspective qui représente un radiateur du module optique de lafigure 1 ; - la
figure 4 est une vue en perspective à plus grande échelle qui représente un élément optique primaire du module optique de lafigure 1 qui est destiné à être agencé à proximité immédiate de la source lumineuse ; - la
figure 5 est une vue en coupe selon le plan de coupe 5-5 de lafigure 6 qui représente le module optique comportant le radiateur muni d'évents réalisés selon le premier mode de réalisation de l'invention ; - la
figure 6 est une vus en perspective qui montre la face avant du radiateur sur laquelle sont montés une carte à circuits imprimés et l'élément optique primaire ; - la
figure 7 est une vue en perspective qui représente une face arrière du radiateur de lafigure 5 équipé d'un ventilateur ; - la
figure 8 est une vue similaire à celle de lafigure 5 qui représente un deuxième mode de réalisation de l'invention.
- the
figure 1 is a perspective view showing an optical module implementing a first embodiment of the invention; - the
figure 2 is a perspective view that represents light emitting means of the module of thefigure 1 ; - the
figure 3 is a perspective view that represents a radiator of the optical module of thefigure 1 ; - the
figure 4 is a perspective view on a larger scale that represents a primary optical element of the optical module of thefigure 1 which is intended to be arranged in close proximity to the light source; - the
figure 5 is a sectional view along the section plane 5-5 of thefigure 6 which represents the optical module comprising the radiator provided with vents made according to the first embodiment of the invention; - the
figure 6 is a perspective view showing the front face of the radiator on which are mounted a printed circuit board and the primary optical element; - the
figure 7 is a perspective view that represents a rear face of the radiator of thefigure 5 equipped with a fan; - the
figure 8 is a view similar to that of thefigure 5 which represents a second embodiment of the invention.
Dans la suite de la description, on adoptera à titre non limitatif des orientations :
- longitudinale "L" orientée d'arrière en avant selon l'axe optique de l'optique de projection du module optique ;
- transversale "T" orientée de gauche à droite ;
- verticale "V" orientée de bas en haut.
- 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.
L'orientation verticale "V" est utilisée à titre de repère géométrique sans rapport avec la direction de la gravité.The vertical orientation "V" is used as a geometrical reference unrelated to the direction of gravity.
Dans la suite de la description, des éléments présentant une structure identique et/ou des fonctions analogues seront désignés par de mêmes références.In the remainder of the description, elements having an identical structure and / or similar functions will be designated by the same references.
On a représenté à la
A titre d'exemple non limitatif, il s'agit ici d'un faisceau lumineux adaptatif qui est composé d'une pluralité de faisceaux élémentaires qui se chevauchent. Un tel module optique 10 est notamment apte à remplir une fonction de feu de route adaptatif, aussi connu sous l'appellation "ADB" pour "Adaptative Driving Beam", ou il est aussi apte à remplir une fonction de feu d'éclairage directionnel, aussi connu sous l'appellation "DBL" pour "Dynamic Bending Light".By way of nonlimiting example, this is an adaptive light beam which is composed of a plurality of overlapping elementary beams. Such an
Le module optique 10 comporte principalement des moyens 12 d'émission de lumière et une optique 14 de projection qui est agencée longitudinalement en avant et à distance des moyens 12 d'émission. L'optique 14 de projection présente un axe "A" optique longitudinalThe
En variante non représentée de l'invention, le dispositif d'éclairage comprend en outre un deuxième module de feu de croisement qui est apte à émettre un unique faisceau de croisement à coupure.In a non-represented variant of the invention, the lighting device further comprises a second dipped-beam module which is able to emit a single passing beam.
Comme cela est représenté plus en détails à la
La source lumineuse 16 est ici formée par une matrice de diodes électroluminescentes 18. La matrice est équipée de deux rangées transversales de dix-sept diodes électroluminescentes 18. L'axe "A" optique passe sensiblement au milieu de la matrice selon la direction transversale. Les diodes électroluminescentes 18 sont toutes agencés sur ladite carte à circuits imprimés 20.The
La matrice s'étend dans un plan orthogonal à la direction longitudinale "L". Plus particulièrement, les diodes électroluminescentes 18 sont portées par la face avant de la carte à circuits imprimés 20.The matrix extends in a plane orthogonal to the longitudinal direction "L". More particularly, the light-emitting
Les diodes électroluminescentes 18 peuvent ici être commandées indépendamment les unes des autres.The light-emitting
En variante, les diodes électroluminescente 18 sont commandées de manière dépendante les unes des autres, par exemple par groupe de deux.In a variant, the light-emitting
Ces diodes électroluminescentes 18 sont susceptibles d'émettre de la chaleur durant leur fonctionnement. Le module optique 10 comporte donc un radiateur 22 pour évacuer une partie de la chaleur par conduction. Le radiateur 22 est représenté plus en détails à la
Le radiateur 22 comporte une plaque 24 transversale verticale présentant une face avant 26 de support de la source lumineuse 16 et une face arrière 28. Le radiateur 22 comporte aussi des ailettes 30 de refroidissement qui hérissent la face arrière 28 de la plaque 24.The
Le dos de la carte à circuits imprimés 20 est plaqué contre la face avant 26 du radiateur 22 de manière à transmettre une partie de la chaleur produite par conduction au radiateur 22. Une couche de pâte thermique (non représentée) est par exemple écrasée entre la carte à circuits imprimés 20 et la face avant 26 du radiateur 22 pour favoriser l'échange thermique entre la carte à circuits imprimés 20 et le radiateur 22. La carte à circuits imprimés 20 est plus particulièrement agencée contre une zone centrale de la face avant 26 du radiateur 22 afin de favoriser son refroidissement.The back of the
Les ailettes 30 de refroidissement permettent d'augmenter la surface d'échange entre le radiateur 22 et l'air extérieur au module optique 10. Les ailettes 30 de refroidissement s'étendent longitudinalement depuis la face arrière 28 de la plaque 24. Il s'agit de manière non limitative d'ailettes 30 transversales parallèles.The cooling
Le module optique 10 comporte un premier élément optique primaire 32 qui est agencé longitudinalement en avant de la matrice 16 de diodes électroluminescentes 18 pour modifier la distribution des rayons lumineux émis par les diodes électroluminescentes 18.The
Comme représenté à la
L'élément optique primaire 32 comporte une matrice d'au moins autant de guides 34 de lumière que la matrice 16 comporte de diodes électroluminescentes 18. Chaque guide 34 de lumière est associé à une diode électroluminescente 18.The primary
Les faces 36 d'entrée des guides 34 de lumière sont agencées dans un plan commun qui est parallèle au plan de la carte à circuits imprimés 20. Lorsque l'élément optique primaire 32 est agencé dans le module optique 10, comme cela est représenté aux
Chaque face 36 d'entrée est plus particulièrement agencée à faible distance longitudinale de la diode électroluminescente 18 associée, par exemple à moins de 1 mm, voire à moins de 0,5 mm. Un interstice 38 est ainsi réservé longitudinalement entre chaque diode électroluminescente 18 et l'élément optique primaire 32.Each input face 36 is more particularly arranged at a short longitudinal distance from the associated light-emitting
Dans un tel contexte, l'air confiné dans l'interstice 38 compris entre la matrice de diodes électroluminescentes 18 et l'élément optique primaire 32 est chauffé par le rayonnement des diodes électroluminescentes 18. Du fait des faibles dimensions de l'interstice 38, l'air ainsi confiné ne se renouvelle pas et continu à s'échauffer. Le radiateur 22 ne permet pas d'évacuer suffisamment de chaleur pour refroidir l'air confiné.In such a context, the air confined in the
On a notamment constaté que, dans certains cas, l'air pouvait s'échauffer jusqu'à atteindre une température critique qui est suffisamment élevée pour altérer l'intégrité physique du matériau constituant l'élément optique primaire 32. C'est par exemple le cas lorsque l'élément optique primaire 32 est réalisé en silicone et que la température dépasse la température critique, par exemple 100°C.In particular, it has been found that, in certain cases, the air can heat up to reach a critical temperature which is high enough to alter the physical integrity of the material constituting the primary
Pour résoudre ce problème et évacuer l'air chaud confiné dans l'interstice 38, l'invention propose un radiateur 22 comportant au moins un évent 40 qui traverse la plaque 24 du radiateur 22 à proximité de la source lumineuse 16. L'évent 40 se présente sous la forme d'un orifice qui traverse la plaque 24 de part en part dans le sens de l'épaisseur et qui débouche entre deux ailettes 30.To solve this problem and evacuate the hot air confined in the
Le module optique 10 comporte en outre un dispositif 42 de production d'un flux d'air qui permet de faire circuler longitudinalement un flux d'air à travers l'évent 40 entre la face arrière 28 et la face avant 26 du radiateur 22. La circulation d'air permet de créer un mouvement de convection forcé qui permet de renouveler au moins partiellement l'air compris dans l'interstice 38. Un tel dispositif 42 sera décrit plus en détails par la suite.The
Par exemple, les évents 40 sont positionnés de manière à ce que le flux d'air produise une aspiration de l'air proche des diodes électroluminescentes en utilisant par exemple l'effet Venturi.For example, the
Le radiateur 22 est réalisé en une seule pièce, par exemple par moulage. Il est réalisé en un matériau conducteur de chaleur et rigide, tel qu'un matériau métallique, par exemple de l'acier. L'évent 40 peut être réalisé directement lors du moulage ou par usinage du radiateur 22.The
Chaque évent 40 est ici réalisé dans une zone centrale du radiateur 22 de manière à être situé à proximité des diodes électroluminescentes 18. Pour que les évents 40 soient agencés au plus proche de la matrice de diodes électroluminescentes 18, dans l'exemple représenté à la
Par ailleurs, pour favoriser le brassage de l'air dans l'interstice 38, il est prévu que chaque évent 40 soit coiffé d'au moins un déflecteur 44 dont une bouche 46 est ouverte en direction de la source lumineuse 16 globalement parallèlement à la face avant 26 du radiateur 22. Ainsi, le déplacement d'air dans l'évent 40 induira un mouvement d'air parallèle à la face avant 26 du radiateur 22 jusqu'à l'interstice 38.Furthermore, to promote the mixing of the air in the
On a représenté aux
En variante, plusieurs évents de section moins longue sont agencés de chaque côté de la zone à refroidir.Alternatively, several vents of smaller section are arranged on each side of the area to be cooled.
Dans le cas présent, seule la zone médiane de la matrice de diodes électroluminescentes 18 est susceptible d'atteindre la température critique. Chaque évent 40 présente donc une section de longueur inférieure à celle de la matrice, mais supérieure à celle de la zone médiane à refroidir.In the present case, only the median zone of the matrix of light-emitting
Chaque évent 40 présente avantageusement une section de passage dont l'aire est limitée à quelques millimètres carrés pour permettre l'accélération de l'air lors de son passage à travers l'évent 40 par effet de Bernoulli. La largeur de la section est par exemple comprise entre 1 et 4 mm.Each
Le flux d'air est ici produit par un ventilateur 42 qui est agencé contre l'extrémité libre des ailettes 30, comme cela est représenté aux
Avantageusement, la deuxième partie du flux d'air dirigée vers les évents 40 circule de manière à ne pratiquement pas refroidir les ailettes 30. Ainsi, l'air qui pénètre dans les évents 40 n'est quasiment pas chauffé par les ailettes 30.Advantageously, the second part of the air flow directed towards the
Comme représenté à la
Chaque évent 40 est coiffé d'un déflecteur 44 qui oriente le flux d'air verticalement en direction de l'interstice 38. Chaque déflecteur 44 s'étend ainsi longitudinalement en saillie par rapport à la carte à circuits imprimés 20.Each
Le déflecteur 44 est ici réalisé en une seule pièce venu de matière avec le radiateur 22. Dans ce cas, les déflecteurs 44 passent à travers les fenêtres 43 de la carte à circuits imprimés 20.The
En variante, le déflecteur 44 est une pièce rapportée. Le déflecteur 44 est par exemple fixé sur la carte à circuits imprimés 20.Alternatively, the
Le dispositif 42 de production du flux d'air produit ainsi un flux d'air dirigé depuis l'évent 40 vers la source lumineuse. Le parcours du flux d'air est indiqué par les flèches de la
Un deuxième mode de réalisation de l'invention a été représenté à la
Chaque déflecteur 44 est prolongé par une paroi 48 de guidage jusqu'à être en contact avec l'élément optique primaire 32 pour conduire le flux d'air jusqu'à l'interstice 38, comme cela est indiqué par les flèches de la
Comme pour le premier mode de réalisation, le déflecteur 44 est par exemple réalisé venue de matière avec le radiateur 22.As for the first embodiment, the
En variante, le déflecteur 44 est réalisé en une pièce rapportée sur la carte à circuits imprimés 20.In a variant, the
La paroi de guidage 48 est réalisée venue de matière avec l'élément optique primaire 32.The
Selon une variante non représentée de ce deuxième mode de réalisation, le déflecteur 44 et la paroi de guidage 48 sont réalisées en une seule pièce commune.According to a not shown variant of this second embodiment, the
Selon une autre variante de réalisation de l'invention qui peut être appliquée à l'un ou l'autre des deux premiers modes de réalisation, le dispositif 42 de production d'un flux d'air, par exemple le ventilateur 42, aspire de l'air à travers l'évent 40. En ce cas, il se produit un effet d'aspiration de l'air chaud contenu dans l'interstice 38 à travers la bouche 46 du déflecteur 44. Le dispositif 42 de production du flux d'air produit ainsi un flux d'air qui est dirigé depuis la source lumineuse 16 vers l'au moins un évent 40. Cette variante de réalisation est particulièrement efficace lorsqu'elle est combinée avec le deuxième mode de réalisation.According to another variant embodiment of the invention that can be applied to one or the other of the first two embodiments, the
Selon une autre variante non représentée de l'invention, le dispositif 42 de production d'un flux d'air est agencé de manière à souffler de l'air directement en direction de l'interstice 38, sans passer par les évents 40. L'air activement mis en mouvement du côté de la face avant 26 du radiateur 22 est ainsi naturellement évacué par les évents 40.According to another variant not shown of the invention, the
Le module optique 10 réalisé selon les enseignements de l'invention permet ainsi de refroidir efficacement l'optique primaire en mettant en mouvement l'air contenu dans l'interstice 38.The
Claims (12)
- 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) spiked with cooling fins (30);- a device (42) for producing an air flow;- the radiator (22) having at least one vent (40) that passes through the radiator plate (24) in the vicinity of the light source (16) to allow the air flow to flow longitudinally between the front and rear of the radiator,characterized in that each vent (40) is covered by at least one deflector (44) which, a mouth (46) of which is open towards the light source (16) generally parallel to the front face (26) of the radiator (22).
- 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).
- Optical module (10) according to the preceding claim, characterized in that the light source (16) comprises a matrix of light-emitting diodes (18).
- Optical module (10) according to the preceding claim, characterized in that the printed circuit board (20) has at least one passage window (43) arranged facing the at least one vent (40).
- Optical module (10) according to any one of the preceding claims, characterized in that the deflector (44) is made of material with the radiator (22).
- Optical module (10) according to any one of claims 1 to 4, characterized in that the deflector (44) is a part attached to the radiator (22).
- Optical module (10) according to any one of the preceding claims, characterized in that it comprises a primary optical element (32) which is arranged in the vicinity of the light source (16), a gap (38) being kept between the light source (16) and the primary optical element (32).
- Optical module (10) according to the preceding claim, characterized in that each deflector (44) is extended by a guide wall (48) to guide the air flow to the gap (38).
- Optical module (10) according to the preceding claim, characterized in that the guide wall (48) is produced integrally with the primary optical element (32).
- An optical module (10) according to any one of the preceding claims, characterized in that the device (42) for producing an airflow produces an air flow directed from the vent (40) toward the light source (16).
- Optical module (10) according to any one of claims 1 to 9, characterized in that the device (42) for producing the air flow produces an air flow which is directed from the light source (16) to the at least one vent (40).
- 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).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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FR1752171A FR3064049B1 (en) | 2017-03-16 | 2017-03-16 | OPTICAL MODULE INCLUDING A RADIATOR EQUIPPED WITH A VENT |
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EP3376101A1 EP3376101A1 (en) | 2018-09-19 |
EP3376101B1 true EP3376101B1 (en) | 2019-12-11 |
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EP18161581.6A Active EP3376101B1 (en) | 2017-03-16 | 2018-03-13 | Optical module comprising a radiator provided with a vent |
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US (1) | US10465877B2 (en) |
EP (1) | EP3376101B1 (en) |
CN (1) | CN108626695B (en) |
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JP7217934B2 (en) * | 2018-12-13 | 2023-02-06 | 市光工業株式会社 | vehicle lamp |
JP2020095876A (en) * | 2018-12-13 | 2020-06-18 | 市光工業株式会社 | Vehicular lighting fixture |
KR102573804B1 (en) * | 2018-12-18 | 2023-09-01 | 현대자동차주식회사 | Integrated control unit vehicle and method for controlling the same |
US11034292B2 (en) * | 2019-07-31 | 2021-06-15 | Ford Global Technologies, Llc | Vehicle grille assembly |
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CN112728496A (en) * | 2019-10-28 | 2021-04-30 | 深圳市绎立锐光科技开发有限公司 | Light source device and lamp |
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- 2018-03-16 US US15/923,196 patent/US10465877B2/en active Active
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EP3376101A1 (en) | 2018-09-19 |
FR3064049A1 (en) | 2018-09-21 |
US20180266646A1 (en) | 2018-09-20 |
CN108626695B (en) | 2021-09-28 |
CN108626695A (en) | 2018-10-09 |
US10465877B2 (en) | 2019-11-05 |
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