EP1726874B1 - LED Headlamp and/or signal lamp for automobiles - Google Patents

LED Headlamp and/or signal lamp for automobiles Download PDF

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Publication number
EP1726874B1
EP1726874B1 EP06290739A EP06290739A EP1726874B1 EP 1726874 B1 EP1726874 B1 EP 1726874B1 EP 06290739 A EP06290739 A EP 06290739A EP 06290739 A EP06290739 A EP 06290739A EP 1726874 B1 EP1726874 B1 EP 1726874B1
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EP
European Patent Office
Prior art keywords
radiator
vehicle
mobile
diodes
light
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.)
Not-in-force
Application number
EP06290739A
Other languages
German (de)
French (fr)
Other versions
EP1726874A1 (en
Inventor
Pierre Albou
Christophe Chenevier
Alexandre Mensales
Eric Moisy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP1726874A1 publication Critical patent/EP1726874A1/en
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Publication of EP1726874B1 publication Critical patent/EP1726874B1/en
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Classifications

    • 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
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/657—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by moving light sources
    • 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
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
    • 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
    • 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
    • F21V29/73—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements being adjustable with respect to each other, e.g. hinged
    • 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
    • F21V29/90—Heating arrangements
    • 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
    • F21S45/60—Heating of lighting devices, e.g. for demisting
    • 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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a lighting or signaling device for a motor vehicle in which the light source is produced by means of light-emitting diodes.
  • the invention also relates to a motor vehicle comprising such a lighting or signaling device.
  • the invention finds applications in the field of the automobile and, in particular, in the field of lighting and signaling for a motor vehicle.
  • a motor vehicle comprises at least two lighting devices located at the front of the vehicle, also called projectors, and signaling devices located at the front and rear of the vehicle.
  • Each lighting or signaling device comprises a housing closed by a protective glass and equipped, on the one hand, with a light source emitting a light beam and, on the other hand, with optical elements making it possible to direct this beam luminous.
  • the light source is made by means of a lamp, such as a discharge lamp, a halogen lamp, etc.
  • the lighting or signaling devices therefore each comprise a single lamp or possibly two lamps for road lighting.
  • These lamps have the advantage of having a high efficiency and a high luminance. However, they have the disadvantage of emitting a strong heat locally. Accordingly, they each constitute, in lighting or signaling devices, a source of heat with a single hot hot spot.
  • the filament of the lamp has a temperature of the order of 3000 ° C
  • the glass balloon of the bulb has a temperature above 400 ° C
  • the base of the lamp has a temperature around 200 ° C.
  • these lamps are generally placed at near a mirror.
  • This mirror is conventionally metallic or metallized, which further concentrates the heat and infrared rays emitted by the lamp.
  • these infrared rays are directed towards the exit face of the lighting or signaling device, namely the protective glass, which heats under the effect of these rays.
  • the protective glass if the protective glass is dirty, the ice absorbs these infrared rays instead of transmitting them, which further concentrates the heat. Therefore, the protective glass of the device must be made of a material particularly resistant to heat.
  • the housings of lighting or signaling devices must be perfectly impervious to humidity, especially rain, snow, etc. It is therefore difficult to ventilate the interior of the housing to cool it.
  • Such a light source is produced by means of a plurality of light-emitting diodes, or LEDs, associated in modules and mounted on a fixed or mobile plate.
  • the temperature reached by a light-emitting diode is of the order of 100 ° C to 150 ° C.
  • Such a light source has the advantage of offering a high yield, which can reach that of conventional lamps, and whose heat is distributed over all the modules. Indeed, the light emitting diodes being grouped into modules inside the housing, the light source is formed of several light spots distributed throughout the housing. The heat emitted by the light source is therefore distributed throughout the housing, which avoids the existence of a single point of concentrated heat.
  • the distribution of the light spots in the housing makes it possible to direct the corresponding light beams in the desired directions, without necessarily using a wraparound mirror.
  • the heat emitted by such a light source is thus dispersed and not screened.
  • the light-emitting diodes are electronic components which have the advantage of not emitting near-infrared rays (in the range 1 to 5 ⁇ m), which makes it possible to locally minimize the heat emitted by the light source.
  • the temperature of a light emitting diode is relatively low compared to the temperature of a conventional lamp and even if the hot spots are distributed in the housing, it is still necessary to cool such a light source.
  • To cool electronic components, and especially power diodes it is known to mount the component to be cooled on a radiator. A radiator is associated with each component. The component is then cooled with ambient air.
  • the ambient air is the air of the housing of the device. It is therefore relatively hot (at a temperature around 95 to 100 ° C). It is therefore necessary to use a relatively large radiator to sufficiently cool this component.
  • the light source is adjustable to allow a correction of the light range.
  • the light source must be able to be turned to the right or to the left of the vehicle so that the lighting follows the path of the road.
  • the light source can also be steerable, up or down the vehicle, to account for the attitude of the vehicle.
  • the light-emitting diodes are mounted on a mobile stage, set in motion by a motor. Now, if each light-emitting diode must be mounted on the mobile stage with the radiator, of relatively large size, which is associated with it, then the mobile stage becomes heavy and the motor ensuring its setting in motion must be powerful.
  • each module having its own mobile stage.
  • the use of several motors simultaneously causes a problem of servocontrol of the assembly to an initial position.
  • the document US - B2 - 6,639,360 proposes to associate fans with radiators. More specifically, this document proposes to place, under each light emitting diode, a radiator which is associated with a fan ensuring a circulation of air propagated by the radiator. In this case, each radiator may be smaller. However, the mass gained by using a smaller radiator is offset, at least in part, by the addition of a fan. The mass problem of the movable stage to put in motion remains identical to the problem stated above.
  • the document FR 2 797 678 A1 shows a lighting device according to the preamble of claim 1.
  • the invention proposes a lighting and / or signaling device whose light source is produced by means of light-emitting diodes cooled by a cooling air flow between at least two radiators.
  • the device of the invention comprises a first radiator of relatively large size, fixedly mounted in the housing of the device, with an end located near a cold point of the vehicle and at least a second radiator mounted so that mobile, near the light emitting diodes.
  • a forced air flow is established between the two radiators to propagate the cooled air from the first radiator to the second radiator.
  • the invention relates to a lighting and / or signaling device for a motor vehicle comprising a housing equipped with a plurality of light-emitting diodes mounted on a mobile stage and forming an orientable light source, and at least a cooling device for said diodes.
  • the cooling device (11) comprises at least a first fixed radiator partially located near a cold point of the vehicle, at least a second mobile radiator mounted near the diodes, and at least one means for forcing forced air convection between the first radiator and the second radiator.
  • the invention also relates to a motor vehicle comprising a device as described above.
  • the figure 1 schematically represents an example of a lighting device comprising a light-emitting diode light source cooled in accordance with the invention.
  • the figure 1 represents an example of a lighting device, also called projector, equipped with a light-emitting diode light source and a cooling device according to the invention.
  • This projector 1 comprises a housing 3 moisture-proof and closed by a protective glass 2 forming the output face of the housing.
  • This housing 3 is generally made of a plastic material.
  • the protective glass 2 is sealingly mounted on the housing 3.
  • a light source 10 is produced by means of a plurality of light-emitting diodes 8.
  • This light source 10 is movable inside. 3.
  • the orientation of the light source 10 is obtained through a motor not shown in the figure.
  • Light-emitting diodes 8, more simply called LEDs or diodes, can be mounted separately or, on the contrary, in a grouped manner in the form of modules.
  • the modules can be dispersed inside the housing 3.
  • the diodes 8 are mounted on a movable plate 9 actuated by the motor.
  • the diodes 8, or the diode modules thus form, with the plate 9, a mobile assembly 4.
  • the fixed radiator 5 is mounted in the projector 1 so that an end 5a of said radiator is placed near a cold point of the vehicle. In other words, one end of this fixed radiator 5 is placed in a refreshed area of the vehicle, for example, in front of the vehicle.
  • the fixed radiator 5 passes through the housing 3 in a thermally sealed manner, so that the end 5a of the radiator opens to the front of the vehicle.
  • the end 5a of the fixed radiator 5 is an integral part of the shield of the vehicle.
  • the end 5a of the fixed radiator may also be located at the junction between the protective glass 2 and the abacus of the vehicle. These locations at the front of the vehicle have the advantage of enjoying an air intake always fresh due to the movement of the vehicle.
  • the fixed radiator 5 can also be placed in the projector so that its end 5a opens on one side of the vehicle, for example under the wing of the vehicle.
  • Such a place has the advantage of being sheltered by the sheet forming the wing of the vehicle while being refreshed continuously by the movement of wheels.
  • the fixed radiator 5 can be inserted into the casing 3 during manufacture of the casing, by overmolding a plastic around the metal forming the radiator.
  • the radiator may, for example, be an insert placed in an injection mold of the housing.
  • the fixed radiator can be made in all over-moldable materials, allowing a good thermal transmission, such as silver, copper, aluminum (especially extruded aluminum) or new materials such as composite materials.
  • This fixed radiator 5 has a shape that can be non-planar.
  • the shape of this radiator is chosen so that the second end 5b of said radiator is located near the movable portion 4 of the projector 1. From this way, the freshness generated at the first end 5a of the radiator causes heat transfer from the second end 5b of the radiator so as to generate cooling in the vicinity of the movable portion 4.
  • the end 5a of the fixed radiator 5 may include fins 5d.
  • the cooling device 11 also comprises one or more second radiators 6 installed in the moving part 4 of the headlamp.
  • This second radiator 6 is movable in the projector, relative to the fixed radiator 5.
  • This mobile radiator 6 is compact in relation to the fixed radiator 5. It can therefore be easily operated by a motor.
  • the mobile radiator 6 is placed facing the second end 5b of the fixed radiator 5.
  • the cold transmitted by the fixed radiator 5 from its end 5a towards its end 5b can cool the ambient air surrounding the end 5b and therefore the mobile radiator 6 located opposite this end 5b.
  • the mobile radiator 6 can be mounted on the plate 9, as shown on the figure 1 . It can also be made in such a way that it itself constitutes the stage of the projector. An axis of rotation is then mounted on said radiator to connect said mobile radiator 6 to the engine.
  • the mobile radiator 6 is placed near the diodes 8 or diode modules. More precisely, each diode or diode module is mounted on a mobile radiator. The same mobile radiator 6 can receive a diode or more diodes. In other words, a mobile radiator 6 is used to cool one or two diodes, in the case where the diodes are mounted individually in the housing. A mobile radiator 6 is used to cool a diode module or several diode modules, in the case where the diodes are grouped into modules. In the example of the figure 1 , the mobile radiator 6 provides cooling of a pair of diode modules 8 placed on either side of the radiator.
  • the cooling device 11 further comprises means 7 for creating a convection of forced air between the fixed radiator 5 and the radiator 6.
  • This convection means 7 ensures a flow of air cooled by the fixed radiator 5 to the mobile radiator 6.
  • the mobile radiator 6 transmits this refreshed air to the diodes 8.
  • the forced air flow between the two radiators is represented by arrows on the figure 1 .
  • the convection means 7 is a fan placed upstream of the fixed and mobile radiators.
  • the fan is used to braze the cooled air surrounding the second end 5b of the fixed radiator 5 and to direct it to the second radiator. This creates a forced circulation of cooled air between the fixed radiator and the mobile radiator.
  • the fan 7 is installed under the fixed radiator 5 so as to force the passage of air over this cold body and to direct this flow of air as directly as possible on the mobile radiator 6.
  • the end 5b of the fixed radiator 5 may include through holes 5c.
  • several fixed radiators can be mounted in the same projector and associated with several fans. All fans do not necessarily work at the same time, especially if all the diodes or diode modules do not work at the same time.
  • the cooling device 11 which has just been described makes it possible to create a cold point inside the casing 3 by thermal conductivity and to force the circulation of a flow of air, cooled by this cold point, towards the inside. of the moving part.
  • the junction between the fixed radiator and the mobile radiator is achieved by a forced air circulation. There is therefore no mechanical connection between the two radiators, which avoids any risk of interaction between the moving part and the fixed part of the projector.
  • the absence of mechanical element also makes it possible to lighten the mass of the moving part.
  • the mass of the moving part that is to say the suspended mass, is also lightened by the fact that the only moving elements are the diodes 8, the mobile radiator 6 and possibly the plate 9.
  • the mobile radiator 6 can be relatively light since it is cooled by chilled air. This radiator 6 can even, alternatively, be a radiator integrated directly to the diode.
  • the heavy elements, namely the fan and the fixed radiator, are not mobile; Their mass therefore has no effect on the projector of the invention.
  • this cooling device 11 can heat the protective glass 2 of the projector. Indeed, the diodes do not emit infrared rays, the protective glass 2 of the projector is warmed. Also, in winter, in the presence of snow or frost, or in the presence of condensation, the protective glass 2 can not defrost. Snow and frost do not melt. Condensation does not evaporate.
  • the cooling device 11 the forced air flow towards the mobile radiator 6 is partially evacuated towards the diodes 8. In the vicinity of the diodes 8, this air flow heats up and then reaches the protective glass that he warms up. Under the effect of this heated air flow, snow and frost melt and condensation evaporates.

Description

Domaine de l'inventionField of the invention

L'invention concerne un dispositif d'éclairage ou de signalisation pour véhicule automobile dans lequel la source lumineuse est réalisée au moyen de diodes électroluminescentes. L'invention concerne également un véhicule automobile comportant un tel dispositif d'éclairage ou de signalisation.The invention relates to a lighting or signaling device for a motor vehicle in which the light source is produced by means of light-emitting diodes. The invention also relates to a motor vehicle comprising such a lighting or signaling device.

L'invention trouve des applications dans le domaine de l'automobile et, en particulier, dans le domaine de l'éclairage et de la signalisation pour véhicule automobile.The invention finds applications in the field of the automobile and, in particular, in the field of lighting and signaling for a motor vehicle.

Etat de la techniqueState of the art

Généralement, un véhicule automobile comporte au moins deux dispositifs d'éclairage situés à l'avant du véhicule, appelés aussi projecteurs, et des dispositifs de signalisation situés à l'avant et à l'arrière du véhicule. Chaque dispositif d'éclairage ou de signalisation comporte un boîtier fermé par une glace de protection et équipé, d'une part, d'une source lumineuse émettant un faisceau lumineux et, d'autres part, d'éléments optiques permettant de diriger ce faisceau lumineux. Actuellement, dans la plupart des dispositifs d'éclairage ou de signalisation, la source lumineuse est réalisée au moyen d'une lampe, telle qu'une lampe à décharge, une lampe halogène, etc. Les dispositifs d'éclairage ou de signalisation comportent donc chacun une seule lampe ou, éventuellement, deux lampes pour l'éclairage de route.Generally, a motor vehicle comprises at least two lighting devices located at the front of the vehicle, also called projectors, and signaling devices located at the front and rear of the vehicle. Each lighting or signaling device comprises a housing closed by a protective glass and equipped, on the one hand, with a light source emitting a light beam and, on the other hand, with optical elements making it possible to direct this beam luminous. Currently, in most lighting or signaling devices, the light source is made by means of a lamp, such as a discharge lamp, a halogen lamp, etc. The lighting or signaling devices therefore each comprise a single lamp or possibly two lamps for road lighting.

Ces lampes présentent l'avantage d'avoir un haut rendement et une forte luminance. Cependant, elles présentent l'inconvénient d'émettre une forte chaleur localement. En conséquence, elles constituent chacune, dans les dispositifs d'éclairage ou de signalisation, une source de chaleur avec un point concentré unique très chaud. Par exemple, dans le cas d'une lampe halogène, le filament de la lampe présente une température de l'ordre de 3000°C, le ballon de verre de l'ampoule présente une température supérieure à 400°C et le culot de l'ampoule présente une température autour de 200°C. Ces lampes présentent, en outre, l'inconvénient d'émettre des rayons infrarouges.These lamps have the advantage of having a high efficiency and a high luminance. However, they have the disadvantage of emitting a strong heat locally. Accordingly, they each constitute, in lighting or signaling devices, a source of heat with a single hot hot spot. For example, in the case of a halogen lamp, the filament of the lamp has a temperature of the order of 3000 ° C, the glass balloon of the bulb has a temperature above 400 ° C and the base of the lamp The bulb has a temperature around 200 ° C. These lamps have, moreover, the disadvantage of emitting infrared rays.

Par ailleurs, pour augmenter encore leur rendement lumineux et pour diriger leur faisceau lumineux, ces lampes sont généralement placées à proximité d'un miroir. Ce miroir est classiquement métallique ou métallisé, ce qui concentre encore la chaleur et les rayons infrarouges émis par la lampe. De plus, ces rayons infrarouges sont dirigés vers la face de sortie du dispositif d'éclairage ou de signalisation, à savoir la glace de protection, qui chauffe sous l'effet de ces rayons. En outre, si la glace de protection est sale, la glace absorbe ces rayons infrarouges au lieu de les transmettre, ce qui concentre encore la chaleur. Par conséquent, la glace de protection du dispositif doit être réalisée dans un matériau particulièrement résistant à la chaleur.Moreover, to further increase their light output and to direct their light beam, these lamps are generally placed at near a mirror. This mirror is conventionally metallic or metallized, which further concentrates the heat and infrared rays emitted by the lamp. In addition, these infrared rays are directed towards the exit face of the lighting or signaling device, namely the protective glass, which heats under the effect of these rays. In addition, if the protective glass is dirty, the ice absorbs these infrared rays instead of transmitting them, which further concentrates the heat. Therefore, the protective glass of the device must be made of a material particularly resistant to heat.

Les boîtiers des dispositifs d'éclairage ou de signalisation doivent être parfaitement étanches à l'humidité ambiante, notamment la pluie, la neige, etc. Il est donc difficile de ventiler l'intérieur du boîtier afin de le refroidir.The housings of lighting or signaling devices must be perfectly impervious to humidity, especially rain, snow, etc. It is therefore difficult to ventilate the interior of the housing to cool it.

Pour résoudre ces problèmes de chaleur concentrée, il est possible de réaliser des sources lumineuses à partir de diodes électroluminescentes. Une telle source lumineuse est réalisée au moyen d'une pluralité de diodes électroluminescentes, ou LED, associées en modules et montées sur une platine fixe ou mobile. La température atteinte par une diode électroluminescente est de l'ordre de 100°C à 150°C. Une telle source lumineuse présente l'avantage d'offrir un rendement important, pouvant atteindre celui des lampes classiques, et dont la chaleur est répartie sur l'ensemble des modules. En effet, les diodes électroluminescentes étant regroupées en modules à l'intérieur du boîtier, la source lumineuse est formée de plusieurs points lumineux répartis dans l'ensemble du boîtier. La chaleur émise par la source lumineuse est donc répartie dans l'ensemble du boîtier, ce qui évite l'existence d'un point unique de chaleur concentrée.To solve these problems of concentrated heat, it is possible to produce light sources from light-emitting diodes. Such a light source is produced by means of a plurality of light-emitting diodes, or LEDs, associated in modules and mounted on a fixed or mobile plate. The temperature reached by a light-emitting diode is of the order of 100 ° C to 150 ° C. Such a light source has the advantage of offering a high yield, which can reach that of conventional lamps, and whose heat is distributed over all the modules. Indeed, the light emitting diodes being grouped into modules inside the housing, the light source is formed of several light spots distributed throughout the housing. The heat emitted by the light source is therefore distributed throughout the housing, which avoids the existence of a single point of concentrated heat.

En outre, la répartition des points lumineux dans le boîtier permet de diriger les faisceaux lumineux correspondants dans les directions souhaitées, sans nécessairement utiliser de miroir enveloppant. La chaleur émise par une telle source lumineuse est ainsi dispersée et non écrantée.In addition, the distribution of the light spots in the housing makes it possible to direct the corresponding light beams in the desired directions, without necessarily using a wraparound mirror. The heat emitted by such a light source is thus dispersed and not screened.

De plus, les diodes électroluminescentes sont des composants électroniques qui présentent l'avantage de ne pas émettre de rayons infrarouges proches (dans l'intervalle 1 à 5 µm), ce qui permet de minimiser localement la chaleur émise par la source lumineuse.In addition, the light-emitting diodes are electronic components which have the advantage of not emitting near-infrared rays (in the range 1 to 5 μm), which makes it possible to locally minimize the heat emitted by the light source.

Toutefois, même si la température d'une diode électroluminescente est relativement faible par rapport à la température d'une lampe classique et même si les points chauds sont répartis dans le boîtier, il est tout de même nécessaire de refroidir une telle source lumineuse. Pour refroidir des composants électroniques, et notamment des diodes de puissance, il est connu de monter le composant à refroidir sur un radiateur. Un radiateur est associé à chaque composant. Le composant est alors refroidi avec de l'air ambiant. Dans le cas où le composant est une diode électroluminescente montée dans un dispositif d'éclairage ou de signalisation d'un véhicule, l'air ambiant est l'air du boîtier du dispositif. Il est donc relativement chaud (à une température autour de 95 à 100°C). Il est, par conséquent, nécessaire d'utiliser un radiateur de dimensions relativement grandes pour refroidir suffisamment ce composant.However, even if the temperature of a light emitting diode is relatively low compared to the temperature of a conventional lamp and even if the hot spots are distributed in the housing, it is still necessary to cool such a light source. To cool electronic components, and especially power diodes, it is known to mount the component to be cooled on a radiator. A radiator is associated with each component. The component is then cooled with ambient air. In the case where the component is a light-emitting diode mounted in a lighting or signaling device of a vehicle, the ambient air is the air of the housing of the device. It is therefore relatively hot (at a temperature around 95 to 100 ° C). It is therefore necessary to use a relatively large radiator to sufficiently cool this component.

L'utilisation d'un tel radiateur est envisageable lorsque la platine sur laquelle sont montées les diodes électroluminescentes est fixe. Or, dans la plupart des véhicules actuels, la source lumineuse est orientable pour permettre une correction de la portée lumineuse. En particulier, avec un système DBL (Bending Light), la source lumineuse doit pouvoir être orientée vers la droite ou vers la gauche du véhicule pour que l'éclairage suive la trajectoire de la route. La source lumineuse peut aussi être orientable, vers le haut ou vers le bas du véhicule, pour tenir compte de l'assiette du véhicule. Dans ces cas, les diodes électroluminescentes sont montées sur une platine mobile, mise en mouvement par un moteur. Or, si chaque diode électroluminescente doit être montée sur la platine mobile avec le radiateur, de taille relativement importante, qui lui est associé, alors la platine mobile devient lourde et le moteur assurant sa mise en mouvement doit être puissant.The use of such a radiator is possible when the plate on which the light emitting diodes are mounted is fixed. However, in most current vehicles, the light source is adjustable to allow a correction of the light range. In particular, with a DBL system (Bending Light), the light source must be able to be turned to the right or to the left of the vehicle so that the lighting follows the path of the road. The light source can also be steerable, up or down the vehicle, to account for the attitude of the vehicle. In these cases, the light-emitting diodes are mounted on a mobile stage, set in motion by a motor. Now, if each light-emitting diode must be mounted on the mobile stage with the radiator, of relatively large size, which is associated with it, then the mobile stage becomes heavy and the motor ensuring its setting in motion must be powerful.

Pour limiter la masse de la platine mobile, il est envisagé de diviser la source lumineuse en plusieurs modules, chaque module comportant sa propre platine mobile. Dans ce cas, il est possible d'utiliser des moteurs moins puissants pour chaque module. Par contre, il est nécessaire d'utiliser un moteur pour chaque platine mobile, ce qui augmente considérablement le coût de chaque dispositif. De plus, l'utilisation de plusieurs moteurs simultanément entraîne un problème d'asservissement de l'ensemble à une position initiale.To limit the mass of the mobile stage, it is envisaged to divide the light source into several modules, each module having its own mobile stage. In this case, it is possible to use less powerful motors for each module. On the other hand, it is necessary to use one motor for each mobile stage, which considerably increases the cost of each device. In addition, the use of several motors simultaneously causes a problem of servocontrol of the assembly to an initial position.

Pour améliorer le refroidissement des composants électroniques, et notamment des diodes de puissance, le document US - B2 - 6 639 360 propose d'associer des ventilateurs aux radiateurs. Plus précisément, ce document propose de placer, sous chaque diode électroluminescente, un radiateur auquel est associé un ventilateur assurant une circulation de l'air propagé par le radiateur. Dans ce cas, chaque radiateur peut être de dimensions moindres. Cependant, la masse gagnée par l'utilisation d'un plus petit radiateur est compensée, au moins en partie, par l'ajout d'un ventilateur. Le problème de masse de la platine mobile à mettre en mouvement reste identique au problème énoncé précédemment.To improve the cooling of electronic components, and in particular power diodes, the document US - B2 - 6,639,360 proposes to associate fans with radiators. More specifically, this document proposes to place, under each light emitting diode, a radiator which is associated with a fan ensuring a circulation of air propagated by the radiator. In this case, each radiator may be smaller. However, the mass gained by using a smaller radiator is offset, at least in part, by the addition of a fan. The mass problem of the movable stage to put in motion remains identical to the problem stated above.

Le document FR 2 797 678 A1 montre un dispositif d'éclairage d'après le préambule de la revendication 1.The document FR 2 797 678 A1 shows a lighting device according to the preamble of claim 1.

Exposé de l'inventionPresentation of the invention

L'invention a justement pour but de remédier aux inconvénients des dispositifs décrits précédemment. A cette fin, l'invention propose un dispositif d'éclairage et/ou de signalisation dont la source lumineuse est réalisée au moyen de diodes électroluminescentes refroidies par une circulation d'air rafraîchi entre au moins deux radiateurs. Plus précisément, le dispositif de l'invention comporte un premier radiateur de taille relativement importante, monté de façon fixe dans le boîtier du dispositif, avec une extrémité située à proximité d'un point froid du véhicule et au moins un second radiateur monté de façon mobile, à proximité des diodes électroluminescentes. Une circulation d'air forcée est établie entre les deux radiateurs pour propager l'air rafraîchi du premier radiateur vers le second radiateur.The purpose of the invention is precisely to overcome the disadvantages of the devices described above. To this end, the invention proposes a lighting and / or signaling device whose light source is produced by means of light-emitting diodes cooled by a cooling air flow between at least two radiators. More specifically, the device of the invention comprises a first radiator of relatively large size, fixedly mounted in the housing of the device, with an end located near a cold point of the vehicle and at least a second radiator mounted so that mobile, near the light emitting diodes. A forced air flow is established between the two radiators to propagate the cooled air from the first radiator to the second radiator.

De façon plus précise, l'invention concerne un dispositif d'éclairage et/ou de signalisation pour véhicule automobile comportant un boîtier équipé d'une pluralité de diodes électroluminescentes montées sur une platine mobile et formant une source lumineuse orientable, et d'au moins un dispositif de refroidissement desdites diodes. Conformément à l'invention, le dispositif de refroidissement (11) comporte au moins un premier radiateur fixe situé partiellement à proximité d'un point froid du véhicule, au moins un second radiateur mobile monté à proximité des diodes, et au moins un moyen pour réaliser une convection d'air forcée entre le premier radiateur et le second radiateur.More specifically, the invention relates to a lighting and / or signaling device for a motor vehicle comprising a housing equipped with a plurality of light-emitting diodes mounted on a mobile stage and forming an orientable light source, and at least a cooling device for said diodes. According to the invention, the cooling device (11) comprises at least a first fixed radiator partially located near a cold point of the vehicle, at least a second mobile radiator mounted near the diodes, and at least one means for forcing forced air convection between the first radiator and the second radiator.

L'invention peut comporter également une ou plusieurs des caractéristiques suivantes :

  • le moyen de convection est placé en amont du premier et du second radiateurs.
  • le moyen de convection comporte un ventilateur.
  • le premier radiateur comporte une partie extérieure au boîtier et une partie insérée dans le boîtier.
  • une extrémité du premier radiateur est située à l'avant du véhicule.
  • l'extrémité du premier radiateur est située sur un coté du véhicule, à proximité d'une aile du véhicule.
  • chaque diode est montée, individuellement ou en module, sur un second radiateur.
  • un second radiateur est intégré directement à chaque diode.
  • le second radiateur est fixé sur la platine.
  • le second radiateur forme la platine.
  • le second radiateur est de faible encombrement par rapport au premier radiateur.
The invention may also include one or more of the following features:
  • the convection means is placed upstream of the first and second radiators.
  • the convection means comprises a fan.
  • the first radiator comprises an outer portion of the housing and a portion inserted into the housing.
  • one end of the first radiator is located at the front of the vehicle.
  • the end of the first radiator is located on one side of the vehicle, near a wing of the vehicle.
  • each diode is mounted, individually or in module, on a second radiator.
  • a second radiator is integrated directly into each diode.
  • the second radiator is fixed on the plate.
  • the second radiator forms the plate.
  • the second radiator is of small size compared to the first radiator.

L'invention concerne également un véhicule automobile comportant un dispositif tel que décrit précédemment.The invention also relates to a motor vehicle comprising a device as described above.

Brève description des dessinsBrief description of the drawings

La figure 1 représente schématiquement un exemple de dispositif d'éclairage comportant une source lumineuse à diodes électroluminescentes refroidie conformément à l'invention.The figure 1 schematically represents an example of a lighting device comprising a light-emitting diode light source cooled in accordance with the invention.

Description détaillée de modes de réalisation de l'inventionDETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

La figure 1 représente un exemple de dispositif d'éclairage, appelé aussi projecteur, équipé d'une source lumineuse à diodes électroluminescentes et d'un dispositif de refroidissement selon l'invention. Ce projecteur 1 comporte un boîtier 3 étanche à l'humidité et fermé par une glace de protection 2 formant la face de sortie du boîtier. Ce boîtier 3 est généralement réalisé dans un matériau plastique. La glace de protection 2 est montée de façon étanche sur le boîtier 3. A l'intérieur du boîtier 3, une source lumineuse 10 est réalisée au moyen d'une pluralité de diodes électroluminescentes 8. Cette source lumineuse 10 est mobile à l'intérieur du boîtier 3. L'orientation de la source lumineuse 10 est obtenue grâce à un moteur non représenté sur la figure.The figure 1 represents an example of a lighting device, also called projector, equipped with a light-emitting diode light source and a cooling device according to the invention. This projector 1 comprises a housing 3 moisture-proof and closed by a protective glass 2 forming the output face of the housing. This housing 3 is generally made of a plastic material. The protective glass 2 is sealingly mounted on the housing 3. Inside the housing 3, a light source 10 is produced by means of a plurality of light-emitting diodes 8. This light source 10 is movable inside. 3. The orientation of the light source 10 is obtained through a motor not shown in the figure.

Les diodes électroluminescentes 8, appelées plus simplement LED ou diodes, peuvent être montées séparément ou, au contraire, de façon regroupée sous la forme de modules. Les modules peuvent être dispersés à l'intérieur du boîtier 3. Dans le projecteur de la figure 1, les diodes 8 sont montées sur une platine mobile 9 actionnée par le moteur. Les diodes 8, ou les modules de diodes, forment donc, avec la platine 9, un ensemble mobile 4.Light-emitting diodes 8, more simply called LEDs or diodes, can be mounted separately or, on the contrary, in a grouped manner in the form of modules. The modules can be dispersed inside the housing 3. In the projector of the figure 1 , the diodes 8 are mounted on a movable plate 9 actuated by the motor. The diodes 8, or the diode modules thus form, with the plate 9, a mobile assembly 4.

Dans l'exemple de la figure 1, les diodes 8 sont refroidies par un dispositif de refroidissement 11. Ce dispositif de refroidissement 11 comporte :

  • un premier radiateur 5, fixe dans le projecteur,
  • au moins un second radiateur 6, mobile dans le projecteur, et
  • un moyen pour réaliser une circulation d'air entre ces deux radiateurs.
In the example of the figure 1 , the diodes 8 are cooled by a cooling device 11. This cooling device 11 comprises:
  • a first radiator 5, fixed in the projector,
  • at least one second radiator 6, movable in the projector, and
  • means for effecting air circulation between these two radiators.

Le radiateur fixe 5 est monté dans projecteur 1 de façon à ce qu'une extrémité 5a dudit radiateur soit placée à proximité d'un point froid du véhicule. En d'autres termes, une extrémité de ce radiateur fixe 5 est placée dans une zone rafraîchie du véhicule, par exemple, à l'avant du véhicule. Dans l'exemple de la figure 1, le radiateur fixe 5 traverse le boîtier 3, de façon thermiquement étanche, afin que l'extrémité 5a du radiateur débouche à l'avant du véhicule. Dans ce cas, l'extrémité 5a du radiateur fixe 5 fait partie intégrante du bouclier du véhicule. L'extrémité 5a du radiateur fixe peut aussi être située à la jonction entre la glace de protection 2 et le boulier du véhicule. Ces emplacements à l'avant du véhicule ont l'avantage de profiter d'une arrivée d'air toujours fraîche due aux déplacements du véhicule.The fixed radiator 5 is mounted in the projector 1 so that an end 5a of said radiator is placed near a cold point of the vehicle. In other words, one end of this fixed radiator 5 is placed in a refreshed area of the vehicle, for example, in front of the vehicle. In the example of the figure 1 , the fixed radiator 5 passes through the housing 3 in a thermally sealed manner, so that the end 5a of the radiator opens to the front of the vehicle. In this case, the end 5a of the fixed radiator 5 is an integral part of the shield of the vehicle. The end 5a of the fixed radiator may also be located at the junction between the protective glass 2 and the abacus of the vehicle. These locations at the front of the vehicle have the advantage of enjoying an air intake always fresh due to the movement of the vehicle.

Le radiateur fixe 5 peut aussi être placé dans le projecteur de façon à ce que son extrémité 5a débouche sur un côté du véhicule, par exemple sous l'aile du véhicule. Un tel endroit présente l'avantage d'être abrité par la tôle formant l'aile du véhicule tout en étant rafraîchi continuellement par le mouvement de roues.The fixed radiator 5 can also be placed in the projector so that its end 5a opens on one side of the vehicle, for example under the wing of the vehicle. Such a place has the advantage of being sheltered by the sheet forming the wing of the vehicle while being refreshed continuously by the movement of wheels.

Le radiateur fixe 5 peut être inséré dans le boîtier 3 lors de la fabrication du boîtier, par surmoulage d'un plastique autour du métal formant le radiateur. Autrement dit, le radiateur peut, par exemple, être un insert placé dans un moule d'injection du boîtier. Le radiateur fixe peut être réalisé dans tous les matériaux surmoulables, permettant une bonne transmission thermique, comme l'argent, le cuivre, l'aluminium (notamment l'aluminium extrudé) ou les nouveaux matériaux tels que les matériaux composites.The fixed radiator 5 can be inserted into the casing 3 during manufacture of the casing, by overmolding a plastic around the metal forming the radiator. In other words, the radiator may, for example, be an insert placed in an injection mold of the housing. The fixed radiator can be made in all over-moldable materials, allowing a good thermal transmission, such as silver, copper, aluminum (especially extruded aluminum) or new materials such as composite materials.

Ce radiateur fixe 5 a une forme qui peut être non plane. La forme de ce radiateur est choisie de façon à ce que la seconde extrémité 5b dudit radiateur soit située à proximité de la partie mobile 4 du projecteur 1. De cette façon, la fraîcheur générée au niveau de la première extrémité 5a du radiateur provoque des transferts de chaleur en provenance de la deuxième extrémité 5b du radiateur de façon à générer un refroidissement au voisinage de la partie mobile 4.This fixed radiator 5 has a shape that can be non-planar. The shape of this radiator is chosen so that the second end 5b of said radiator is located near the movable portion 4 of the projector 1. From this way, the freshness generated at the first end 5a of the radiator causes heat transfer from the second end 5b of the radiator so as to generate cooling in the vicinity of the movable portion 4.

Pour une meilleure réception de la fraîcheur extérieure au projecteur, l'extrémité 5a du radiateur fixe 5 peut comporter des ailettes 5d.For better reception of the cool outside the projector, the end 5a of the fixed radiator 5 may include fins 5d.

Le dispositif de refroidissement 11 comporte également un ou plusieurs seconds radiateurs 6 installés dans la partie mobile 4 du projecteur. Ce second radiateur 6 est mobile dans le projecteur, par rapport au radiateur fixe 5. Ce radiateur mobile 6 est de faible encombrement par rapport au radiateur fixe 5. Il peut donc être facilement actionné par un moteur.The cooling device 11 also comprises one or more second radiators 6 installed in the moving part 4 of the headlamp. This second radiator 6 is movable in the projector, relative to the fixed radiator 5. This mobile radiator 6 is compact in relation to the fixed radiator 5. It can therefore be easily operated by a motor.

Le radiateur mobile 6 est placé en regard de la seconde extrémité 5b du radiateur fixe 5. Ainsi, le froid transmis par le radiateur fixe 5 de son extrémité 5a vers son extrémité 5b permet de rafraîchir l'air ambiant environnant l'extrémité 5b et donc le radiateur mobile 6 situé en face de cette extrémité 5b. Pour une meilleure transmission du froid, il est souhaitable de mettre le corps froid, à savoir le radiateur fixe 5, le plus proche possible des diodes, la limite étant dictée par le débattement du radiateur mobile lors des rotations de la partie mobile.The mobile radiator 6 is placed facing the second end 5b of the fixed radiator 5. Thus, the cold transmitted by the fixed radiator 5 from its end 5a towards its end 5b can cool the ambient air surrounding the end 5b and therefore the mobile radiator 6 located opposite this end 5b. For a better transmission of cold, it is desirable to put the cold body, namely the fixed radiator 5, as close as possible to the diodes, the limit being dictated by the movement of the mobile radiator during rotations of the movable part.

Le radiateur mobile 6 peut être monté sur la platine 9, comme montré sur la figure 1. Il peut aussi être réalisé de telle sorte qu'il constitue lui-même la platine du projecteur. Un axe de rotation est alors monté sur ledit radiateur pour relier ledit radiateur mobile 6 au moteur.The mobile radiator 6 can be mounted on the plate 9, as shown on the figure 1 . It can also be made in such a way that it itself constitutes the stage of the projector. An axis of rotation is then mounted on said radiator to connect said mobile radiator 6 to the engine.

Le radiateur mobile 6 est placé à proximité des diodes 8 ou des modules de diodes. Plus précisément, chaque diode ou module de diodes est montée sur un radiateur mobile. Un même radiateur mobile 6 peut recevoir une diode ou plusieurs diodes. En d'autres termes, un radiateur mobile 6 est utilisé pour refroidir une ou deux diodes, dans le cas où les diodes sont montées individuellement dans le boîtier. Un radiateur mobile 6 est utilisé pour refroidir un module de diodes ou plusieurs modules de diodes, dans le cas où les diodes sont regroupées en modules. Dans l'exemple de la figure 1, le radiateur mobile 6 assure le refroidissement d'un couple de modules de diodes 8 placés de part et d'autre du radiateur.The mobile radiator 6 is placed near the diodes 8 or diode modules. More precisely, each diode or diode module is mounted on a mobile radiator. The same mobile radiator 6 can receive a diode or more diodes. In other words, a mobile radiator 6 is used to cool one or two diodes, in the case where the diodes are mounted individually in the housing. A mobile radiator 6 is used to cool a diode module or several diode modules, in the case where the diodes are grouped into modules. In the example of the figure 1 , the mobile radiator 6 provides cooling of a pair of diode modules 8 placed on either side of the radiator.

Le dispositif de refroidissement 11 comporte, en outre, un moyen 7 pour créer une convection d'air forcée entre le radiateur fixe 5 et le radiateur mobile 6. Ce moyen de convection 7 assure une circulation de l'air rafraîchi par le radiateur fixe 5 vers le radiateur mobile 6. Le radiateur mobile 6 transmet cet air rafraîchi aux diodes 8. La circulation d'air forcée entre les deux radiateurs est représentée par des flèches sur la figure 1.The cooling device 11 further comprises means 7 for creating a convection of forced air between the fixed radiator 5 and the radiator 6. This convection means 7 ensures a flow of air cooled by the fixed radiator 5 to the mobile radiator 6. The mobile radiator 6 transmits this refreshed air to the diodes 8. The forced air flow between the two radiators is represented by arrows on the figure 1 .

Dans un mode de réalisation préféré de l'invention, le moyen de convection 7 est un ventilateur placé en amont des radiateurs fixe et mobile. De cette façon, le ventilateur permet de braser l'air rafraîchi environnant la deuxième extrémité 5b du radiateur fixe 5 et de le diriger vers le deuxième radiateur. On crée ainsi une circulation forcée d'air refroidi entre le radiateur fixe et le radiateur mobile. Autrement dit, le ventilateur 7 est installé sous le radiateur fixe 5 de manière à forcer le passage de l'air sur ce corps froid et à diriger ce flux d'air le plus directement possible sur le radiateur mobile 6.In a preferred embodiment of the invention, the convection means 7 is a fan placed upstream of the fixed and mobile radiators. In this way, the fan is used to braze the cooled air surrounding the second end 5b of the fixed radiator 5 and to direct it to the second radiator. This creates a forced circulation of cooled air between the fixed radiator and the mobile radiator. In other words, the fan 7 is installed under the fixed radiator 5 so as to force the passage of air over this cold body and to direct this flow of air as directly as possible on the mobile radiator 6.

Pour une meilleure circulation de l'air entre les deux radiateurs, l'extrémité 5b du radiateur fixe 5 peut comporter des trous traversants 5c.For better air circulation between the two radiators, the end 5b of the fixed radiator 5 may include through holes 5c.

Dans un mode de réalisation de l'invention, plusieurs radiateurs fixes peuvent être montés dans un même projecteur et associées à plusieurs ventilateurs. Tous les ventilateurs ne fonctionnent alors pas nécessairement en même temps, notamment si toutes les diodes ou tous les modules de diodes ne fonctionnent pas en même temps.In one embodiment of the invention, several fixed radiators can be mounted in the same projector and associated with several fans. All fans do not necessarily work at the same time, especially if all the diodes or diode modules do not work at the same time.

Le dispositif de refroidissement 11 qui vient d'être décrit permet de créer un point froid à l'intérieur du boîtier 3 par conductivité thermique et de forcer la circulation d'un flux d'air, rafraîchi par ce point froid, vers l'intérieur de la partie mobile.The cooling device 11 which has just been described makes it possible to create a cold point inside the casing 3 by thermal conductivity and to force the circulation of a flow of air, cooled by this cold point, towards the inside. of the moving part.

Dans ce dispositif de refroidissement 11, la jonction entre le radiateur fixe et le radiateur mobile est réalisée par une circulation d'air forcée. Il n'y a donc aucune jonction mécanique entre les deux radiateurs, ce qui évite tout risque d'interaction entre la partie mobile et la partie fixe du projecteur.In this cooling device 11, the junction between the fixed radiator and the mobile radiator is achieved by a forced air circulation. There is therefore no mechanical connection between the two radiators, which avoids any risk of interaction between the moving part and the fixed part of the projector.

L'absence d'élément mécanique permet en outre d'alléger la masse de la partie mobile. La masse de la partie mobile, c'est-à-dire la masse suspendue, est également allégée par le fait que les seuls éléments mobiles sont les diodes 8, le radiateur mobile 6 et éventuellement la platine 9. Le radiateur mobile 6 peut être relativement léger puisqu'il est refroidi par de l'air rafraîchi. Ce radiateur 6 peut même, selon une variante, être un radiateur intégré directement à la diode. Les éléments lourds, à savoir le ventilateur et le radiateur fixe, ne sont pas mobiles ; Leur masse n'a donc pas d'effet sur le projecteur de l'invention.The absence of mechanical element also makes it possible to lighten the mass of the moving part. The mass of the moving part, that is to say the suspended mass, is also lightened by the fact that the only moving elements are the diodes 8, the mobile radiator 6 and possibly the plate 9. The mobile radiator 6 can be relatively light since it is cooled by chilled air. This radiator 6 can even, alternatively, be a radiator integrated directly to the diode. The heavy elements, namely the fan and the fixed radiator, are not mobile; Their mass therefore has no effect on the projector of the invention.

Par ailleurs, ce dispositif de refroidissement 11 permet de réchauffer la glace de protection 2 du projecteur. En effet, les diodes n'émettant pas de rayons infrarouges, la glace de protection 2 du projecteur n'est réchauffée. Aussi, en hiver, en présence de neige ou de givre, ou en présence de condensation, la glace de protection 2 ne peut se dégivrer. La neige et le givre ne fondent pas. La condensation ne s'évapore pas. Dans le dispositif de refroidissement 11, le flux d'air forcé vers le radiateur mobile 6 s'évacue en partie vers les diodes 8. A proximité des diodes 8, ce flux d'air se réchauffe et atteint ensuite la glace de protection qu'il réchauffe. Sous l'effet de ce flux d'air réchauffé, la neige et le givre fondent et la condensation s'évapore.Moreover, this cooling device 11 can heat the protective glass 2 of the projector. Indeed, the diodes do not emit infrared rays, the protective glass 2 of the projector is warmed. Also, in winter, in the presence of snow or frost, or in the presence of condensation, the protective glass 2 can not defrost. Snow and frost do not melt. Condensation does not evaporate. In the cooling device 11, the forced air flow towards the mobile radiator 6 is partially evacuated towards the diodes 8. In the vicinity of the diodes 8, this air flow heats up and then reaches the protective glass that he warms up. Under the effect of this heated air flow, snow and frost melt and condensation evaporates.

Claims (12)

  1. Lighting and/or signalling device for a motor vehicle comprising a housing (3) equipped with:
    - a plurality of light-emitting diodes (8) which are fitted on a mobile plate (9) and form a source of light (10) which can be oriented; and
    - at least one device (11) for cooling the said diodes (8),
    characterised in that the cooling device (11) comprises:
    - at least one first, fixed radiator (5), which can preferably be situated partially in the vicinity of a cold point of the vehicle:
    - at least one second, mobile radiator (6), which is fitted in the vicinity of the diodes (8): and
    - at least one means (7) for creation of convection of forced air between the first radiator (5) and the second radiator (6).
  2. Device according to claim 1, characterised in that the means (7) for convection is placed upstream from the first and second radiators.
  3. Device according to either of claims 1 to 2, characterised in that the means (7) for convection comprises a fan.
  4. Device according to any one of claims 1 to 3, characterised in that the first radiator (5) comprises a part outside the housing (3) and a part inserted in the housing (3).
  5. Device according to claim 4, characterised in that the first, fixed radiator (5) is fitted in the said lighting and/or signalling device such that one end (5a) of the said radiator is placed in the vicinity of a cold point of the vehicle, situated at the front of the vehicle.
  6. Device according to claim 4, characterised in that the first, fixed radiator (5) is fitted in the said lighting and/or signalling device such that one end (5a) of the said radiator is placed in the vicinity of a cold point of the vehicle, situated at one side of the vehicle, in the vicinity of a wing of the vehicle.
  7. Device according to any one of claims 1 to 6, characterised in that each diode (8) is fitted individually or in a module, on a second radiator (6).
  8. Device according to any one of claims 1 to 6, characterised in that a second radiator is integrated/ associated directly with each diode (8).
  9. Device according to any one of claims 1 to 8, characterised in that the second radiator (6) is secured to the plate (9).
  10. Device according to any one of claims 1 to 8, characterised in that the second radiator (6) forms the plate (9).
  11. Device according to any one of claims 1 to 10, characterised in that the second radiator has a smaller size than the first radiator.
  12. Motor vehicle, characterised in that it comprises at least one lighting and/or signalling device according to any one of claims 1 to 11.
EP06290739A 2005-05-23 2006-05-09 LED Headlamp and/or signal lamp for automobiles Not-in-force EP1726874B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0505162A FR2885990B1 (en) 2005-05-23 2005-05-23 LIGHT - EMITTING DIODE LIGHTING AND / OR SIGNALING DEVICE FOR MOTOR VEHICLE.

Publications (2)

Publication Number Publication Date
EP1726874A1 EP1726874A1 (en) 2006-11-29
EP1726874B1 true EP1726874B1 (en) 2012-11-21

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EP06290739A Not-in-force EP1726874B1 (en) 2005-05-23 2006-05-09 LED Headlamp and/or signal lamp for automobiles

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US (1) US7371964B2 (en)
EP (1) EP1726874B1 (en)
JP (1) JP4718373B2 (en)
FR (1) FR2885990B1 (en)

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Also Published As

Publication number Publication date
FR2885990B1 (en) 2007-07-13
FR2885990A1 (en) 2006-11-24
US7371964B2 (en) 2008-05-13
EP1726874A1 (en) 2006-11-29
US20070035957A1 (en) 2007-02-15
JP4718373B2 (en) 2011-07-06
JP2006332052A (en) 2006-12-07

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