EP2986895A1 - Cooling member and motor vehicle lighting or signalling device comprising such a member - Google Patents

Cooling member and motor vehicle lighting or signalling device comprising such a member

Info

Publication number
EP2986895A1
EP2986895A1 EP14718433.7A EP14718433A EP2986895A1 EP 2986895 A1 EP2986895 A1 EP 2986895A1 EP 14718433 A EP14718433 A EP 14718433A EP 2986895 A1 EP2986895 A1 EP 2986895A1
Authority
EP
European Patent Office
Prior art keywords
fins
base
cooling member
lighting
housing
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.)
Withdrawn
Application number
EP14718433.7A
Other languages
German (de)
French (fr)
Inventor
Jean-Baptiste HEINE
Christine Roucoules
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
Original Assignee
Valeo Vision SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP2986895A1 publication Critical patent/EP2986895A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • 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
    • 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
    • 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
    • F21S45/49—Attachment of the cooling means
    • 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
    • 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
    • F21V29/74—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
    • F21V29/763—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 the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V29/767—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 the planes containing the fins or blades having directions perpendicular to the light emitting axis

Definitions

  • Cooling member and lighting or signaling device for a motor vehicle comprising such a member.
  • the invention relates to a cooling member and a lighting or signaling device for a motor vehicle comprising such a member.
  • the lighting or signaling devices of motor vehicles are composed in their generality of a housing closed by a transparent wall through which emerge one or more light beams.
  • This housing houses at least one optical module, mainly comprising a light source, and an optical system capable of modifying at least one parameter of the light generated by the light source for the emission of the light beam by the optical module.
  • the optical system comprises optical components such as a reflector, a lens, a diffusing element or a collimator, or even any other device able to modify at least one of the parameters of the light generated by the light source.
  • LEDs are not radiate omnidirectionally but in a more directive way than other light sources.
  • the small size of the LEDs and their directional light radiation can reduce the size and simplify the structure of the optical module, with the advantage of facilitating its integration inside the housing.
  • LEDs produce heat that is detrimental to their performance, as the higher the LED temperature, the lower the light output. The heat released can even cause problems with the proper power supply of the LEDs.
  • the object of the present invention is to provide a cooling member for a lighting and / or signaling device for a motor vehicle that complies with the aforementioned constraints.
  • a cooling member for lighting and / or signaling device for a motor vehicle comprising a base configured to support a light source of said device, and at least one heat sink device in connection with thermal conduction at said base, said heat dissipating device comprising a plurality of heat dissipating fins, said base having large faces connected by a wafer, each of the fins extending from one of said large faces, said base extending in shape so that junction areas of at least two of said fins with said base extend in separate planes.
  • the space occupied by the cooling member is distributed in space.
  • Using fins extending from one and only one of said large faces also makes it possible to avoid the use of fins of complex shape while allowing the establishment of a thermal connection with the base which is effective, this according to low cost techniques and mechanically reliable, especially with regard to the vibration resistance. It may indeed be, inter alia:
  • the fin material is a deformable metal, for example aluminum or an aluminum alloy
  • said fins are fixed on said base by welding, gluing and / or brazing;
  • said large faces of the base are regulated surfaces, in particular planes;
  • said base comprises a bottom and at least one lateral wing
  • the bottom is configured to support said light source
  • the bottom and / or the side wing or wings are flat and each comprise two of said large faces;
  • a first plurality of said fins extends from said bottom and / or a second plurality of said fins extends from said lateral wing; at least one of said pluralities of fins is extruded and / or molded with said base, as already mentioned above;
  • the fins of the said plurality of fin fins attached to the said base are fixed individually to the said base;
  • ribs are provided in said base to accommodate said fins
  • the fins of the said plurality of fins on said base are fixed in pairs on said base in the form of a folded sheet, as already mentioned above;
  • the fins of the said plurality of fins on said base are fixed on said base in the form of an accordion-folded sheet, as already mentioned above;
  • said sheet is folded continuously according to a set of adjacent air convection channels
  • the thickness of said fins is between 0.8 and 1 millimeter, in particular for the fins of the series or sets of fins attached to said base;
  • the distance between said fins is between 4 and 6 millimeters, in particular for the fins of the series or sets of fins added to said base;
  • - Said fins are configured to allow the convection of air between them, which has the advantage of not having to use a forced circulation of air.
  • the invention also relates to a lighting and / or signaling device for a motor vehicle comprising a cooling member as described above.
  • Said lighting and / or signaling device comprises, in particular, a housing closed by an ice intended to be traversed by one or more light beams, the housing housing at least one optical module comprising said light source and an optical system capable of modifying at least one parameter of the light generated by the light source for the emission of the beam (s) illuminated by said lighting device, said heat sink device being mounted in the available housing volume around the optical module and / or the optical system.
  • the heat dissipating device is adapted to the optical module and / or the optical system so that it can be mounted in the available volume of the housing around said members without hindering the operation thereof. It follows from this provision an increase in the heat exchange surface associated with the lighting and / or signaling device without having to increase its size. This increase in the heat exchange surface makes it possible to optimize the cooling of the optical module and to adapt this cooling to a more powerful light source when needed.
  • Said lighting and / or signaling device may comprise one or more optical modules whose light sources are of an operating power capable of emitting a light beam of moderate to high intensity.
  • the light source comprises LEDs, or light-emitting diodes, whose heat they generate must be evacuated.
  • the LEDs can, for example, emit a strong lighting beam, for example of the low beam and / or high beam type, or emit a moderate beam of light for the emission of a daytime running light or signaling light.
  • Power LEDs are LEDs that generally have a lumen output of at least 30 lumens and emit higher heat than moderate LEDs for signaling.
  • the fins are in particular configured not to hinder an upward flow of convection air.
  • the heat exchange surface or planar fins of said heat sink device is more specifically oriented along the general axis of gravity.
  • This heat exchange surface is thus oriented so that it is naturally swept by the upward flow of air casing warming in contact with the fins, this orientation being considered when the general axis of emergence of the light out of the optical module is oriented approximately perpendicular to the general axis of gravity.
  • Such a general direction of emergence of the light corresponds approximately to the orientation that the lighting device and / or signaling, once mounted on the vehicle for which it is intended.
  • the fins are oriented in their general plane along the general axis of gravity.
  • said base has a U-shaped profile comprising two lateral branches connected by a central branch and the optical module is situated at the level of said central branch.
  • Fig.1 is a schematic elevational view illustrating a front lighting and / or signaling device according to an embodiment of the present invention
  • FIG.2 is a schematic top view showing the components of the lighting and / or signaling device as shown in Fig.1;
  • FIG. 3 is a schematic perspective view illustrating a cooling member, according to an alternative embodiment, substantially along the general axis of emergence of the light emitted by the optical module equipping said member;
  • FIG. 4 is a diagrammatic view from above of the cooling member and the optical module of FIG.
  • identical references designate identical or similar elements.
  • the invention relates to a lighting and / or signaling device 1 for a motor vehicle. It comprises a housing 3 closed by a transparent closure glass 5, as illustrated very schematically.
  • the housing 3 here houses an optical module 7 for the emission of at least one global light beam by the transparent closure window 5.
  • This optical module 7 comprises, for example, a light source consisting of one or more LEDs 9.
  • An optical system 11 is associated with the optical module 7. It is intended to modify at least one of the parameters of the light generated by the light source 9, such as its mean reflection and / or its direction.
  • the optical system 1 1 comprises a reflector 13, which concentrates the light emitted by the light source 9 into a light beam in the direction of the closing glass 5, facing the observer in FIG.
  • the invention also relates to a cooling member 15 for such a lighting and / or signaling device.
  • This cooling member 15 is intended to dissipate the heat generated by the light source 9 in operation. It comprises a base 17 on which said optical module is mounted.
  • the optical module 7 is carried by a median portion 17a of the base.
  • Said base 17 comprises large faces 30, 32 connected by a wafer 34, in particular large flat faces parallel in pairs.
  • This base 17 is relatively massive, being for example molded of aluminum-type metal or aluminum alloy.
  • Said base 17 comprises, for example, said median portion 17a and at least one lateral wing 17b, here two.
  • Said middle portion 17a and 17b or said wings 17b are, for example, planar. In other words, they each comprise two large flat faces 30, 32 parallel connected by said wafer 34.
  • the one or more Lateral wings 17b extend, for example, from said middle portion 17a of the base, in particular from material thereof.
  • the said base can thus be obtained by molding and / or extrusion. It has a U-shaped profile here, said lateral wings 17b defining the lateral branches of the U and the median portion 17a of its central branch. In other words, said side wings are here rotated at right angles to the central plate 17a of the base.
  • Said cooling member further comprises a heat sink 21 in heat conduction connection with said base 17.
  • Said heat sink device 21 comprises a plurality of cooling fins 19, 23 formed with a convection space of the air between them.
  • said heat sink 21 comprises a first set of fins 19 associated with the central plate 17a of the base, in particular from material of said central plate, advantageously extruded.
  • the fins 1 9 of the first set of fins are parallel to each other and parallel to said side wings 17b of the base 17.
  • the heat sink 21 further comprises two other sets 25, here identical, fins 23 mounted on each side of the middle portion 17a, facing the reflector 13, these sides being constituted by plates 17b forming the wings of the base 17
  • the fins 23 are here parallel to the plate 17a.
  • the assembly comprises a median plane of symmetry P.
  • These assemblies 25 are for example soldered, welded and / or glued by means of a thermal conductive adhesive to the side plates 17b. They occupy a rectangular parallelepipedal volume, on either side of the sides 17b of the base. They are thus perfectly capable of being integrated into the space available in the housing 3, as it appears in FIG.
  • the fins 23 or other sets of fins are derived from thin sheet of aluminum, for example of thickness 0.8 millimeters, folded continuously on each of said sets 25 to form channels 27 of convection air, as this can be seen in Figure 2.
  • These channels 27 are substantially U-section and alternately open and closed, two by two on their side opposite to the side wings 17b.
  • the plane of the fins 23 or the axis of the channels 27 is oriented substantially parallel to the gravity vector.
  • the distance between the fin planes 23 in the channels 27 is provided to provide a natural upward convection of the air, being for example between 4 and 6 millimeters.
  • the fins 19 associated with the median portion 17a of the base and the fins 23 associated with each of the lateral wings 17b have junction zones 35 with said base located in separate plans.
  • the fins 19 of the first set of fins and the fins 23 of the other set (s) thus constitute a global surface of heat exchange with the ambient air to obtain the cooling of the optical module 7 and therefore of the light source 9 which is assigned to them.
  • the flow of cooling air is naturally generated by the upward movement of the air heating in contact with the fins 19, 23 constituting the heat exchange surface of cooling, the temperature of this heat exchange surface being greater than that from the surrounding air.
  • the space available in the housing under the cooling member 15 and under each of the heat sink assemblies 25 is configured to be sufficient to allow air to flow into said fins.
  • the mass of the heat sink 21 is kept relatively low by the use of the other set (s) fins that may be provided finer than the fins of the first set of fins.
  • the use of two technologies to define said fins 19, 23, such as a technology by molding or extrusion for the fins 19 of the middle part 17a and a technology of fins folded and / or reported by brazing, bonding and / or welding makes it possible to have a cooling member of limited cost.
  • the choice of a connection zone located at a single large face of the base also facilitates obtaining said cooling member while allowing a good exchange between the fins and the base.
  • FIGS. 3 and 4 An alternative embodiment is shown in FIGS. 3 and 4. This variant differs from the previous embodiment by the implantation of the two sets of fins 23 on the base 17. These assemblies 25, identical to those of the previous embodiment, are in fact arranged in extension of the fins 19 of the first set of fins. The lateral wings 17b of the base are in this case directed downwards.
  • the optical module is located between the side wings 17b, while in the embodiment of Figures 3 and 4, this time the fins 19 of the first set of fins which are located between said lateral wings 17b.
  • first set of fins 19 and the other set of fins 23 may define distinctly oriented channels, as in Figures 1 and 2, or in parallel, as in Figures 3 and 4.
  • shape of the fins can be adapted to the shape of the housing to provide a minimum space for air circulation between the ends of the fins and the wall of the housing.
  • Said fins have, for example, smooth and flat walls to facilitate convection.
  • These fins could still have a curved profile on part of their section, for example sinusoidal in a substantially vertical axis of development, which further increases the heat exchange surface relative to a straight profile.
  • the invention thus provides a possibility of optimizing the cooling of a light source, in particular of the light-emitting diode type, in lighting and signaling devices for motor vehicles.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The invention concerns a cooling member (15) for a lighting and/or signalling device (1) for a motor vehicle, said member (15) comprising a base (17) configured to support a light source (9) of said device, and at least one heat dissipating device (21) in thermal conduction connection with said base (17), said heat dissipating device (21) comprising a plurality of heat dissipation fins (19, 23), said base (17) having large faces (30, 32) linked by a wafer (34), each of the fins (19, 23) extending from one of said large faces (30, 32), said base (17) extending in shape such that junction areas (35) of at least two of said fins (19, 23) with said base (17) extend in different planes.

Description

Organe de refroidissement et dispositif d'éclairage ou de signalisation de véhicule automobile comprenant un tel organe.  Cooling member and lighting or signaling device for a motor vehicle comprising such a member.
L'invention concerne un organe de refroidissement et un dispositif d'éclairage ou de signalisation pour véhicule automobile comprenant un tel organe. The invention relates to a cooling member and a lighting or signaling device for a motor vehicle comprising such a member.
Les dispositifs d'éclairage ou de signalisation de véhicules automobiles sont composés dans leur généralité d'un boîtier fermé par une paroi transparente à travers laquelle émergent un ou plusieurs faisceaux lumineux. Ce boîtier loge au moins un module optique, comprenant principalement une source lumineuse, et un système optique apte à modifier au moins un paramètre de la lumière générée par la source lumineuse pour l'émission du faisceau lumineux par le module optique. Le système optique comprend des composants optiques tels qu'un réflecteur, une lentille, un élément diffusant ou un collimateur, voire tout autre organe apte à modifier au moins l'un des paramètres de la lumière générée par la source lumineuse. The lighting or signaling devices of motor vehicles are composed in their generality of a housing closed by a transparent wall through which emerge one or more light beams. This housing houses at least one optical module, mainly comprising a light source, and an optical system capable of modifying at least one parameter of the light generated by the light source for the emission of the light beam by the optical module. The optical system comprises optical components such as a reflector, a lens, a diffusing element or a collimator, or even any other device able to modify at least one of the parameters of the light generated by the light source.
L'évolution des techniques tend à favoriser l'utilisation de sources lumineuses constituées d'au moins une DEL (Diode Electroluminescente), en raison de leur faible consommation en énergie et de la qualité de l'éclairage obtenu. Les DEL ne rayonnent pas de manière omnidirectionnelle mais de manière plus directive que les autres sources lumineuses. Le faible encombrement des DEL et leur rayonnement lumineux directif permettent de réduire l'encombrement et de simplifier la structure du module optique, avec pour avantage de faciliter son intégration à l'intérieur du boîtier. Cependant en cours de fonctionnement, les DEL produisent de la chaleur qui est nuisible à leur performance, car plus une DEL monte en température, plus son flux lumineux diminue. La chaleur dégagée peut même poser des problèmes relatifs à la bonne alimentation électrique des DEL. Il est donc nécessaire de prévoir des dispositions pour permettre un refroidissement de la ou des DEL qui constituent la source lumineuse du module optique, afin d'éviter une montée en température des DEL au-delà d'un seuil tolérable d'exploitation. A cet effet, il est courant d'équiper le module optique d'un dissipateur de chaleur à ailettes. On évacue de la sorte la chaleur générée par la source lumineuse vers le volume intérieur du boîtier et/ou vers l'extérieur du boîtier, à partir d'un échange thermique exploitant la surface des ailettes que comporte le dissipateur. L'optimisation de l'échange thermique, entre le dissipateur à ailettes chauffé par les DEL et l'air, peut être obtenue par l'accroissement de la surface via une augmentation de la taille et/ou du nombre d'ailettes de l'organe de refroidissement. Cependant, cette solution est mise en œuvre en augmentant la taille d'une base plane de support. Ceci présente l'inconvénient d'induire un accroissement de l'encombrement surfacique du module optique, ce qui est à éviter pour faciliter son implantation à l'intérieur du boîtier. Une telle implantation est de plus susceptible d'être rendue délicate en raison d'une exiguïté de l'espace disponible pour la réception du ou des modules optiques, et/ou en raison des contraintes liées à l'agencement global du projecteur au regard de son environnement proche lorsqu'il est monté sur le véhicule. Il est en conséquence utile d'organiser le refroidissement du ou des modules optiques de manière à ne pas faire obstacle à leur implantation à l'intérieur du boîtier. II doit aussi être pris en compte le fait que le volume des moyens utilisés pour le refroidissement des DEL que comportent les modules optiques est dépendant de la quantité de chaleur qu'elles génèrent selon leur puissance de fonctionnement, elle-même dépendante de l'intensité lumineuse nécessaire pour l'émission de lumière du faisceau lumineux correspondant. Or, si le volume des dispositifs d'éclairage est parfois important, il convient de limiter leur encombrement. The evolution of techniques tends to favor the use of light sources consisting of at least one LED (Electroluminescent Diode), because of their low energy consumption and the quality of the lighting obtained. LEDs do not radiate omnidirectionally but in a more directive way than other light sources. The small size of the LEDs and their directional light radiation can reduce the size and simplify the structure of the optical module, with the advantage of facilitating its integration inside the housing. However, during operation, LEDs produce heat that is detrimental to their performance, as the higher the LED temperature, the lower the light output. The heat released can even cause problems with the proper power supply of the LEDs. It is therefore necessary to provide provisions to allow cooling of the LED or LEDs which constitute the light source of the optical module, in order to avoid a temperature rise of the LEDs beyond a tolerable operating threshold. For this purpose, it is common to equip the optical module with a finned heat sink. In this way, the heat generated by the light source is evacuated towards the internal volume of the casing and / or towards the outside of the casing, from a heat exchange exploiting the surface of the fins that the dissipator comprises. Optimization of the heat exchange, between the finned heatsink by the LEDs and the air, can be obtained by increasing the surface via an increase in the size and / or the number of fins of the cooling element. However, this solution is implemented by increasing the size of a flat support base. This has the disadvantage of inducing an increase in the surface area of the optical module, which is to be avoided to facilitate its implantation inside the housing. Such an implantation is moreover likely to be made difficult because of a small space available for the reception of the optical module or modules, and / or because of the constraints related to the overall arrangement of the projector with regard to its close environment when it is mounted on the vehicle. It is therefore useful to organize the cooling of the optical module or modules so as not to hinder their implementation inside the housing. It must also be taken into account that the volume of the means used for the cooling of the LEDs that comprise the optical modules is dependent on the amount of heat they generate according to their operating power, itself dependent on the intensity light necessary for the light emission of the corresponding light beam. However, if the volume of lighting devices is sometimes important, it should limit their size.
Par ailleurs, il convient de trouver des solutions qui permettent d'augmenter la surface d'échange tout en restant fiables, en particulier mécaniquement, et de coûts limités. Le but de la présente invention est de proposer un organe de refroidissement pour un dispositif d'éclairage et/ou de signalisation pour véhicule automobile respectant les contraintes précitées. II est proposé selon la présente invention un organe de refroidissement pour dispositif d'éclairage et/ou de signalisation pour véhicule automobile, ledit organe comprenant une base configurée pour supporter une source lumineuse dudit dispositif, et au moins un dispositif dissipateur de chaleur en liaison de conduction thermique à ladite base, ledit dispositif dissipateur de chaleur comprenant une pluralité d'ailettes de dissipation thermique, ladite base présentant des grandes faces reliées par une tranche, chacune des ailettes s'étendant à partir de l'une desdites grandes faces, ladite base s'étendant en forme pour que des zones de jonction d'au moins deux desdites ailettes avec ladite base s'étendent dans des plans distincts. Moreover, it is necessary to find solutions that increase the exchange surface while remaining reliable, especially mechanically, and limited costs. The object of the present invention is to provide a cooling member for a lighting and / or signaling device for a motor vehicle that complies with the aforementioned constraints. It is proposed according to the present invention a cooling member for lighting and / or signaling device for a motor vehicle, said member comprising a base configured to support a light source of said device, and at least one heat sink device in connection with thermal conduction at said base, said heat dissipating device comprising a plurality of heat dissipating fins, said base having large faces connected by a wafer, each of the fins extending from one of said large faces, said base extending in shape so that junction areas of at least two of said fins with said base extend in separate planes.
Par ailettes, on entend des éléments présentant une épaisseur très inférieure à leurs autres dimensions. Il s'agit, par exemple, d'éléments plats, présentant deux faces planes parallèles l'une à l'autre. Autrement dit, chacune des ailettes présente une zone de jonction avec ladite base s'étendant linéairement, notamment de façon rectiligne, sur l'une desdites grandes faces. By fins means elements having a thickness much smaller than their other dimensions. This is, for example, flat elements, having two flat faces parallel to one another. In other words, each of the fins has a junction zone with said base extending linearly, particularly rectilinearly, on one of said large faces.
En réalisant une extension en forme de la base, on répartit dans l'espace l'encombrement de l'organe de refroidissement. On peut de la sorte disposer d'une surface d'échange agrandie, en limitant l'accroissement de la taille dudit organe dans un plan unique. Utiliser des ailettes s'étendant à partir d'une et une seulement desdites grandes faces permet en outre d'éviter l'utilisation d'ailettes de forme complexe tout en autorisant l'établissement d'une liaison thermique avec la base qui soit efficace, ceci selon des techniques à faible coût de revient et fiable mécaniquement, en particulier en regard de la résistance aux vibrations. Il pourra en effet s'agir, entre autres : By carrying out an extension in the form of the base, the space occupied by the cooling member is distributed in space. In this way it is possible to have an enlarged exchange surface, by limiting the increase in the size of said organ in a single plane. Using fins extending from one and only one of said large faces also makes it possible to avoid the use of fins of complex shape while allowing the establishment of a thermal connection with the base which is effective, this according to low cost techniques and mechanically reliable, especially with regard to the vibration resistance. It may indeed be, inter alia:
- d'ailettes extrudées avec la base ;  fins extruded with the base;
- d'ailettes rapportées unitairement sur la base, le long de leur tranche ; - d'ailettes appariées en paires d'ailettes provenant du pliage en « U » d'une tôle de matière ; cette paire d'ailettes peut être jointe à la base au niveau de la partie joignant les deux branches du « U », notamment de manière à permettre une fixation à la base sur une surface de contact plus large que sur une tranche d'ailette et donc une fixation plus solide ; en variante cette paire d'ailettes peut être jointe à la base au niveau des extrémités des deux branches du « U », permettant ainsi d'augmenter la surface d'échange, puisque la partie joignant les deux branches du « U » est alors à distance de la base ; - fin unitarily reported on the base, along their edge; fins paired in pairs of fins from the "U" fold of a sheet of material; this pair of fins may be joined to the base at the portion joining the two branches of the "U", in particular so as to allow attachment to the base on a wider contact surface than on a fin wafer and therefore a stronger fixation; alternatively this pair of fins can be joined to the base at the ends of the two branches of the "U", thus increasing the exchange surface, since the part joining the two branches of the "U" is then to distance from the base;
- d'ailettes provenant du pliage en accordéon d'une tôle de matière ; ceci permet notamment de cumuler les avantages des deux variantes des paires d'ailettes en fins from the folding accordion of a sheet of material; this makes it possible in particular to cumulate the advantages of the two variants of the pairs of fins in
« U », puisque qu'il y a à la fois des jonctions à la base au niveau des parties joignant les ailettes, notamment de manière à permettre des fixations à la base sur des surfaces de contact plus large que sur des tranches d'ailettes et donc une fixation plus solide, et à la fois une augmentation de la surface d'échange grâce aux portions joignant les ailettes à distance de la base. "U", since there are at the same time junctions at the base at the parts joining the fins, in particular so as to allow fastenings at the base on wider contact surfaces than on slices of fins and therefore a more solid attachment, and at the same time an increase of the exchange surface thanks to the portions joining the fins away from the base.
Selon différents modes de réalisation de l'invention, qui pourront être pris ensemble ou séparément : - le matériau des ailettes est un métal déformable, par exemple de l'aluminium ou un alliage d'aluminium ; According to various embodiments of the invention, which may be taken together or separately: the fin material is a deformable metal, for example aluminum or an aluminum alloy;
- lesdites ailettes sont fixées sur ladite base par soudage, collage et/ou brasage ; said fins are fixed on said base by welding, gluing and / or brazing;
- lesdites grandes faces de la base sont des surfaces réglées, notamment des plans ; said large faces of the base are regulated surfaces, in particular planes;
- ladite base comprend un fond et au moins une aile latérale ; said base comprises a bottom and at least one lateral wing;
- la ou lesdites ailes latérales s'étendent à partir du fond ;  - said side wing or wings extend from the bottom;
- le fond est configuré pour supporter ladite source lumineuse ;  the bottom is configured to support said light source;
- le fond et/ou la ou les ailes latérales sont plats et comprennent chacun deux desdites grandes faces ;  - The bottom and / or the side wing or wings are flat and each comprise two of said large faces;
- une première pluralité desdites ailettes s'étend à partir dudit fond et/ou une seconde pluralité des dites ailettes s'étend à partir de ladite aile latérale ; - l'une au moins desdites pluralités d'ailettes est extrudée et/ou moulée avec ladite base, comme déjà évoqué plus haut ; a first plurality of said fins extends from said bottom and / or a second plurality of said fins extends from said lateral wing; at least one of said pluralities of fins is extruded and / or molded with said base, as already mentioned above;
- l'une au moins desdites pluralités d'ailettes est rapportée sur ladite base ;  at least one of said pluralities of fins is attached to said base;
- les ailettes de la ou desdites pluralités d'ailettes rapportées sur ladite base sont fixées unitairement sur ladite base ;  the fins of the said plurality of fin fins attached to the said base are fixed individually to the said base;
- des nervures sont prévues dans ladite base pour accueillir lesdites ailettes ;  ribs are provided in said base to accommodate said fins;
- au moins certaines des ailettes de la ou desdites pluralités d'ailettes rapportées sur ladite base sont fixées par paire sur ladite base sous la forme d'une tôle pliée, comme déjà évoqué plus haut ;  at least some of the fins of the said plurality of fins on said base are fixed in pairs on said base in the form of a folded sheet, as already mentioned above;
- au moins certaines des ailettes de la ou desdites pluralités d'ailettes rapportées sur ladite base sont fixées sur ladite base sous la forme d'une tôle pliée en accordéon, comme déjà évoqué plus haut ; at least some of the fins of the said plurality of fins on said base are fixed on said base in the form of an accordion-folded sheet, as already mentioned above;
- ladite tôle est pliée en continu selon un ensemble de canaux adjacents de convection de l'air ;  said sheet is folded continuously according to a set of adjacent air convection channels;
- l'épaisseur desdites ailettes est comprise entre 0,8 et 1 millimètre, en particulier pour les ailettes de la ou des séries d'ailettes rapportées sur ladite base ; the thickness of said fins is between 0.8 and 1 millimeter, in particular for the fins of the series or sets of fins attached to said base;
- la distance entre lesdites ailettes est comprise entre 4 et 6 millimètres en particulier pour les ailettes de la ou des séries d'ailettes rapportées sur ladite base ;  the distance between said fins is between 4 and 6 millimeters, in particular for the fins of the series or sets of fins added to said base;
- lesdites ailettes sont configurées de façon à permettre la convection de l'air entre elles, ce qui présente l'avantage de ne pas avoir à employer une circulation forcée de l'air. - Said fins are configured to allow the convection of air between them, which has the advantage of not having to use a forced circulation of air.
L'invention concerne aussi un dispositif d'éclairage et/ou de signalisation pour véhicule automobile comprenant un organe de refroidissement tel que décrit précédemment. The invention also relates to a lighting and / or signaling device for a motor vehicle comprising a cooling member as described above.
Ledit dispositif d'éclairage et/ou de signalisation comprend, notamment, un boîtier fermé par une glace destinée à être traversée par un ou plusieurs faisceaux lumineux, le boîtier logeant au moins un module optique comprenant ladite source lumineuse et un système optique apte à modifier au moins un paramètre de la lumière générée par la source lumineuse pour l'émission du ou des faisceaux lumineux par ledit dispositif d'éclairage, ledit dispositif dissipateur de chaleur étant monté dans le volume disponible du boîtier autour du module optique et/ou du système optique. Autrement dit, le dispositif dissipateur de chaleur est adapté au module optique et/ou au système optique de sorte à pouvoir être monté dans le volume disponible du boîtier autour desdits organes sans faire obstacle au fonctionnement de ces derniers. II résulte de cette disposition un accroissement de la surface d'échange thermique associée au dispositif d'éclairage et/ou de signalisation sans avoir à augmenter son encombrement. Cet accroissement de la surface d'échange thermique permet d'optimiser le refroidissement du module optique et d'adapter ce refroidissement à une source lumineuse plus puissante en cas de besoin. Said lighting and / or signaling device comprises, in particular, a housing closed by an ice intended to be traversed by one or more light beams, the housing housing at least one optical module comprising said light source and an optical system capable of modifying at least one parameter of the light generated by the light source for the emission of the beam (s) illuminated by said lighting device, said heat sink device being mounted in the available housing volume around the optical module and / or the optical system. In other words, the heat dissipating device is adapted to the optical module and / or the optical system so that it can be mounted in the available volume of the housing around said members without hindering the operation thereof. It follows from this provision an increase in the heat exchange surface associated with the lighting and / or signaling device without having to increase its size. This increase in the heat exchange surface makes it possible to optimize the cooling of the optical module and to adapt this cooling to a more powerful light source when needed.
Ledit dispositif d'éclairage et/ou de signalisation peut comporter un ou des modules optiques dont les sources lumineuses sont d'une puissance de fonctionnement apte à émettre un faisceau lumineux d'intensité modérée à forte. Avantageusement, la source lumineuse comporte des DEL, ou diodes électroluminescentes, dont la chaleur qu'elles génèrent doit être évacuée. Les DEL peuvent par exemple émettre un faisceau d'éclairage puissant, par exemple de type feu de croisement et/ou feu de route, ou encore émettre un faisceau d'éclairage modéré pour l'émission d'un feu de position diurne ou de signalisation. Les DEL de puissance sont des DEL ayant généralement un flux lumineux de l'ordre d'au moins 30 lumens et dégagent une chaleur plus élevée que des DEL de flux lumineux modéré pour la signalisation. Said lighting and / or signaling device may comprise one or more optical modules whose light sources are of an operating power capable of emitting a light beam of moderate to high intensity. Advantageously, the light source comprises LEDs, or light-emitting diodes, whose heat they generate must be evacuated. The LEDs can, for example, emit a strong lighting beam, for example of the low beam and / or high beam type, or emit a moderate beam of light for the emission of a daytime running light or signaling light. . Power LEDs are LEDs that generally have a lumen output of at least 30 lumens and emit higher heat than moderate LEDs for signaling.
Les ailettes sont notamment configurées pour ne pas faire obstacle à un flux d'air ascensionnel de convection. The fins are in particular configured not to hinder an upward flow of convection air.
La surface d'échange thermique ou plan des ailettes dudit dispositif dissipateur de chaleur est plus spécifiquement orienté suivant l'axe général de gravité. Cette surface d'échange thermique est ainsi orientée de sorte qu'elle soit naturellement balayée par le flux ascendant de l'air du boîtier se réchauffant au contact des ailettes, cette orientation étant considérée lorsque l'axe général d'émergence de la lumière hors du module optique est orienté environ perpendiculairement à l'axe général de gravité. Une telle orientation générale d'émergence de la lumière correspond environ à l'orientation qu'a le dispositif d'éclairage et/ou de signalisation, une fois monté sur le véhicule auquel il est destiné. Ainsi, les ailettes sont orientées dans leur plan général suivant l'axe général de gravité. Avantageusement, ladite base présente un profil en U comprenant deux branches latérales reliées par une branche centrale et le module optique est situé au niveau de ladite branche centrale. The heat exchange surface or planar fins of said heat sink device is more specifically oriented along the general axis of gravity. This heat exchange surface is thus oriented so that it is naturally swept by the upward flow of air casing warming in contact with the fins, this orientation being considered when the general axis of emergence of the light out of the optical module is oriented approximately perpendicular to the general axis of gravity. Such a general direction of emergence of the light corresponds approximately to the orientation that the lighting device and / or signaling, once mounted on the vehicle for which it is intended. Thus, the fins are oriented in their general plane along the general axis of gravity. Advantageously, said base has a U-shaped profile comprising two lateral branches connected by a central branch and the optical module is situated at the level of said central branch.
Les caractéristiques ci-dessus et d'autres de la présente invention apparaîtront plus clairement en regard de la description ci-dessous de modes de réalisation de l'invention en référence aux figures des dessins annexés, sur lesquels : The above and other features of the present invention will appear more clearly with reference to the following description of embodiments of the invention with reference to the figures of the accompanying drawings, in which:
La fig.1 est une vue en élévation schématique illustrant de face un dispositif d'éclairage et/ou de signalisation selon un mode de réalisation de la présente invention ; Fig.1 is a schematic elevational view illustrating a front lighting and / or signaling device according to an embodiment of the present invention;
La fig.2 est une vue schématique de dessus montrant les composants du dispositif d'éclairage et/ou de signalisation tel que représenté sur la fig.1 ; La fig.3 est une vue en perspective schématique illustrant un organe de refroidissement, selon une variante de réalisation, sensiblement selon l'axe général d'émergence de la lumière émise par le module optique équipant ledit organe ; La fig.4 est une vue schématique de dessus de l'organe de refroidissement et du module optique de la figure 3. Dans ce qui suit, des références identiques désignent des éléments identiques ou analogues. Fig.2 is a schematic top view showing the components of the lighting and / or signaling device as shown in Fig.1; FIG. 3 is a schematic perspective view illustrating a cooling member, according to an alternative embodiment, substantially along the general axis of emergence of the light emitted by the optical module equipping said member; FIG. 4 is a diagrammatic view from above of the cooling member and the optical module of FIG. In the following, identical references designate identical or similar elements.
Comme illustré aux figures 1 à 4, l'invention concerne un dispositif d'éclairage et/ou de signalisation 1 pour véhicule automobile. Il comprend un boîtier 3 fermé par une glace de fermeture transparente 5, tels qu'illustrés de façon très schématique. As illustrated in FIGS. 1 to 4, the invention relates to a lighting and / or signaling device 1 for a motor vehicle. It comprises a housing 3 closed by a transparent closure glass 5, as illustrated very schematically.
Le boîtier 3 loge ici un module optique 7 pour l'émission d'au moins un faisceau lumineux global par la glace de fermeture transparente 5. Ce module optique 7 comporte, par exemple, une source lumineuse constituée d'une ou plusieurs DEL 9. Un système optique 1 1 est associé au module optique 7. Il est destiné à modifier au moins l'un des paramètres de la lumière générée par la source lumineuse 9, tel que sa réflexion moyenne et/ou sa direction. Dans l'exemple représenté, le système optique 1 1 comprend un réflecteur 13, qui concentre la lumière émise par la source lumineuse 9 en un faisceau lumineux en direction de la glace de fermeture 5, face à l'observateur sur la figure 1 . The housing 3 here houses an optical module 7 for the emission of at least one global light beam by the transparent closure window 5. This optical module 7 comprises, for example, a light source consisting of one or more LEDs 9. An optical system 11 is associated with the optical module 7. It is intended to modify at least one of the parameters of the light generated by the light source 9, such as its mean reflection and / or its direction. In the example shown, the optical system 1 1 comprises a reflector 13, which concentrates the light emitted by the light source 9 into a light beam in the direction of the closing glass 5, facing the observer in FIG.
L'invention concerne aussi un organe de refroidissement 15 pour un tel dispositif d'éclairage et/ou de signalisation. Cet organe de refroidissement 15 est destiné à dissiper la chaleur générée par la source lumineuse 9 en fonctionnement. Il comprend une base 17 sur laquelle ledit module optique est monté. Sur l'exemple de réalisation illustré, le module optique 7 est porté par une partie médiane 17a de la base. Ladite base 17 comprend des grandes faces 30, 32 reliées par une tranche 34, en particulier des grandes faces planes, parallèles deux à deux. Cette base 17 est relativement massive, étant par exemple moulée en métal de type aluminium ou alliage d'aluminium. The invention also relates to a cooling member 15 for such a lighting and / or signaling device. This cooling member 15 is intended to dissipate the heat generated by the light source 9 in operation. It comprises a base 17 on which said optical module is mounted. In the exemplary embodiment illustrated, the optical module 7 is carried by a median portion 17a of the base. Said base 17 comprises large faces 30, 32 connected by a wafer 34, in particular large flat faces parallel in pairs. This base 17 is relatively massive, being for example molded of aluminum-type metal or aluminum alloy.
Ladite base 17 comprend, par exemple, ladite partie médiane 17a et au moins une aile latérale 17b, ici deux. Ladite partie médiane 17a et la ou lesdites ailes 17b sont, par exemple, planes. Autrement dit, elles comprennent chacune deux grandes faces planes 30, 32 parallèles reliées par ladite tranche 34. La ou lesdites ailes latérales 17b s'étendent, par exemple, à partir de ladite partie médiane 17a de la base, notamment en étant issues de matière de celle-ci. La dite base pourra ainsi être obtenue par moulage et/ou par extrusion. Elle présente ici un profil en U, lesdites ailes latérales 17b définissant les branches latérales du U et la partie médiane 17a sa branche centrale. Autrement dit, lesdites ailes latérales sont ici tournées à angle droit de la plaque centrale 17a de la base. Said base 17 comprises, for example, said median portion 17a and at least one lateral wing 17b, here two. Said middle portion 17a and 17b or said wings 17b are, for example, planar. In other words, they each comprise two large flat faces 30, 32 parallel connected by said wafer 34. The one or more Lateral wings 17b extend, for example, from said middle portion 17a of the base, in particular from material thereof. The said base can thus be obtained by molding and / or extrusion. It has a U-shaped profile here, said lateral wings 17b defining the lateral branches of the U and the median portion 17a of its central branch. In other words, said side wings are here rotated at right angles to the central plate 17a of the base.
Ledit organe de refroidissement comprend en outre un dissipateur de chaleur 21 en liaison de conduction thermique à ladite base 17. Ledit dispositif dissipateur de chaleur 21 comprend une pluralité d'ailettes de refroidissement 19, 23, ménagées avec un espace de convection de l'air entre elles. Said cooling member further comprises a heat sink 21 in heat conduction connection with said base 17. Said heat sink device 21 comprises a plurality of cooling fins 19, 23 formed with a convection space of the air between them.
En particulier, ledit dissipateur de chaleur 21 comprend un premier ensemble d'ailettes 19 associé à la plaque centrale 17a de la base, notamment issues de matière de ladite plaque centrale, avantageusement extrudées. Les ailettes 1 9 du premier ensemble d'ailettes sont parallèles entre elles et parallèles auxdites ailes latérales 17b de la base 17. In particular, said heat sink 21 comprises a first set of fins 19 associated with the central plate 17a of the base, in particular from material of said central plate, advantageously extruded. The fins 1 9 of the first set of fins are parallel to each other and parallel to said side wings 17b of the base 17.
Le dissipateur de chaleur 21 comporte en outre deux autres ensembles 25, ici identiques, d'ailettes 23 montés de chaque côté de la partie médiane 17a, en regard du réflecteur 13, ces côtés étant constitués des plaques 17b formant les ailes de la base 17. Les ailettes 23 sont ici parallèles à la plaque 17a. L'ensemble comporte un plan de symétrie médian P. Ces ensembles 25 sont par exemple brasés, soudés et/ou collés au moyen d'une colle conductrice thermique aux plaques de côté 17b. Ils occupent un volume parallélépipédique rectangle, de part et d'autre des côtés 17b de la base. Ils sont ainsi parfaitement susceptibles d'être intégrés à l'espace disponible dans le boîtier 3, comme il apparaît sur la figure 1 . Dans cette configuration le dispositif dissipateur de chaleur participe à l'action de l'organe de refroidissement 15 et ne gêne ni le module optique 7 ni la réflexion du faisceau lumineux issu du réflecteur 13 du système optique 1 1 . Les ailettes 23 du ou des autres ensembles d'ailettes sont issues de tôle fine en aluminium, par exemple d'épaisseur 0,8 millimètre, pliée en continu sur chacun desdits ensembles 25 pour constituer des canaux 27 de convection de l'air, comme on le voit à la figure 2. Ces canaux 27 sont de section sensiblement en U et alternativement ouverts et fermés, deux à deux sur leur côté opposé aux ailes latérales 17b. Le plan des ailettes 23 ou l'axe des canaux 27 est orienté sensiblement parallèle au vecteur de gravité. La distance entre les plans d'ailette 23 dans les canaux 27 est prévue pour ménager une convection naturelle ascendante de l'air, en étant par exemple comprise entre 4 et 6 millimètres. The heat sink 21 further comprises two other sets 25, here identical, fins 23 mounted on each side of the middle portion 17a, facing the reflector 13, these sides being constituted by plates 17b forming the wings of the base 17 The fins 23 are here parallel to the plate 17a. The assembly comprises a median plane of symmetry P. These assemblies 25 are for example soldered, welded and / or glued by means of a thermal conductive adhesive to the side plates 17b. They occupy a rectangular parallelepipedal volume, on either side of the sides 17b of the base. They are thus perfectly capable of being integrated into the space available in the housing 3, as it appears in FIG. In this configuration the heat sink device participates in the action of the cooling member 15 and does not interfere with the optical module 7 or the reflection of the light beam from the reflector 13 of the optical system 1 1. The fins 23 or other sets of fins are derived from thin sheet of aluminum, for example of thickness 0.8 millimeters, folded continuously on each of said sets 25 to form channels 27 of convection air, as this can be seen in Figure 2. These channels 27 are substantially U-section and alternately open and closed, two by two on their side opposite to the side wings 17b. The plane of the fins 23 or the axis of the channels 27 is oriented substantially parallel to the gravity vector. The distance between the fin planes 23 in the channels 27 is provided to provide a natural upward convection of the air, being for example between 4 and 6 millimeters.
On remarque que, compte-tenu de la forme donnée à la base, les ailettes 19 associées à la partie médiane 17a de la base et les ailettes 23 associées à chacune des ailes latérales 17b présentent des zones de jonction 35 avec ladite base situées dans des plans distincts. Note that, given the shape given to the base, the fins 19 associated with the median portion 17a of the base and the fins 23 associated with each of the lateral wings 17b have junction zones 35 with said base located in separate plans.
Les ailettes 19 du premier ensemble d'ailettes et les ailettes 23 du ou des autres ensembles constituent de la sorte une surface globale d'échange thermique avec l'air ambiant pour obtenir le refroidissement du module optique 7 et donc de la source lumineuse 9 qui leur est affectée. The fins 19 of the first set of fins and the fins 23 of the other set (s) thus constitute a global surface of heat exchange with the ambient air to obtain the cooling of the optical module 7 and therefore of the light source 9 which is assigned to them.
Le flux d'air de refroidissement est naturellement généré par le mouvement ascensionnel de l'air se réchauffant au contact des ailettes 19, 23 constituant la surface d'échange thermique de refroidissement, la température de cette surface d'échange thermique étant supérieure à celle de l'air environnant. L'espace disponible dans le boîtier sous l'organe de refroidissement 15 et sous chacun des ensembles 25 du dissipateur de chaleur est configuré de façon à être suffisant pour permettre à l'air de circuler dans les dites ailettes. Lorsque l'on regarde la figure 2, on voit que le nombre d'ailettes 23 du ou desdits ensembles d'ailettes sur une longueur donnée, transversale aux plans, est relativement dense, plus dense que le nombre d'ailettes 19 correspondant du premier ensemble d'ailettes, ce qui procure à l'organe de refroidissement un rendement d'échange thermique amélioré pour le refroidissement du module optique 7. La masse du dissipateur de chaleur 21 est maintenue relativement faible par l'usage du ou des autres ensembles d'ailettes qui pourront être prévues plus fines que les ailettes du premier ensemble d'ailettes. Il est encore à noter que l'usage de deux technologies pour définir lesdites ailettes 19, 23, telle qu'une technologie par moulage ou extrusion pour les ailettes 19 de la partie médiane 17a et une technologie d'ailettes pliées et/ou rapportées par brasage, collage et/ou soudage permet de disposer d'un organe de refroidissement de coût limité. Le choix d'une zone de liaison se trouvant au niveau d'une seule grande face de la base facilité également l'obtention dudit organe de refroidissement tout en autorisant un bon échange entre les ailettes et la base. The flow of cooling air is naturally generated by the upward movement of the air heating in contact with the fins 19, 23 constituting the heat exchange surface of cooling, the temperature of this heat exchange surface being greater than that from the surrounding air. The space available in the housing under the cooling member 15 and under each of the heat sink assemblies 25 is configured to be sufficient to allow air to flow into said fins. When we look at FIG. 2, it can be seen that the number of fins 23 of said set of fins on a given length, transverse to the planes, is relatively dense, denser than the number of fins 19 corresponding to the first set of fins, which provides the cooling member with an improved heat exchange efficiency for cooling the optical module 7. The mass of the heat sink 21 is kept relatively low by the use of the other set (s) fins that may be provided finer than the fins of the first set of fins. It should also be noted that the use of two technologies to define said fins 19, 23, such as a technology by molding or extrusion for the fins 19 of the middle part 17a and a technology of fins folded and / or reported by brazing, bonding and / or welding makes it possible to have a cooling member of limited cost. The choice of a connection zone located at a single large face of the base also facilitates obtaining said cooling member while allowing a good exchange between the fins and the base.
Une variante de réalisation est représentée aux figures 3 et 4. Cette variante diffère du mode de réalisation précédent par l'implantation des deux ensembles 25 d'ailettes 23 sur la base 17. Ces ensembles 25, identiques à ceux du mode de réalisation précédent, sont en effet disposés en prolongement des ailettes 19 du premier ensemble d'ailettes. Les ailes latérales 17b de la base sont dans ce cas dirigées vers le bas. An alternative embodiment is shown in FIGS. 3 and 4. This variant differs from the previous embodiment by the implantation of the two sets of fins 23 on the base 17. These assemblies 25, identical to those of the previous embodiment, are in fact arranged in extension of the fins 19 of the first set of fins. The lateral wings 17b of the base are in this case directed downwards.
Ainsi, dans le mode de réalisation des figures 1 et 2, le module optique est situé entre les ailes latérales 17b, tandis que dans le mode de réalisation des figures 3 et 4, ce sont cette fois les ailettes 19 du premier ensemble d'ailettes qui sont situées entre lesdites ailes latérales 17b. Thus, in the embodiment of Figures 1 and 2, the optical module is located between the side wings 17b, while in the embodiment of Figures 3 and 4, this time the fins 19 of the first set of fins which are located between said lateral wings 17b.
Cela étant, le premier ensemble d'ailettes 19 et le ou les autres ensembles d'ailettes 23 pourront définir des canaux orientés de façon distincte, comme aux figures 1 et 2, ou parallèlement, comme aux figures 3 et 4. II est à noter que la forme des ailettes peut être adaptée à la forme du boîtier pour ménager un espace minimal de circulation de l'air entre les extrémités des ailettes et la paroi du boîtier. Lesdites ailettes présentent, par exemple des parois lisses et planes pour faciliter la convection. That being so, the first set of fins 19 and the other set of fins 23 may define distinctly oriented channels, as in Figures 1 and 2, or in parallel, as in Figures 3 and 4. It should be noted that the shape of the fins can be adapted to the shape of the housing to provide a minimum space for air circulation between the ends of the fins and the wall of the housing. Said fins have, for example, smooth and flat walls to facilitate convection.
Ces ailettes pourraient encore avoir un profil courbe sur une partie de leur section, par exemple sinusoïdal dans un axe de développement sensiblement vertical, ce qui augmente encore la surface d'échange thermique relativement à un profil droit. These fins could still have a curved profile on part of their section, for example sinusoidal in a substantially vertical axis of development, which further increases the heat exchange surface relative to a straight profile.
L'invention apporte ainsi une possibilité d'optimiser le refroidissement d'une source lumineuse, notamment de type diode électroluminescente, dans les dispositifs d'éclairage et de signalisation pour véhicules automobiles. The invention thus provides a possibility of optimizing the cooling of a light source, in particular of the light-emitting diode type, in lighting and signaling devices for motor vehicles.

Claims

Revendications claims
1 . Organe de refroidissement (15) pour dispositif d'éclairage et/ou de signalisation (1 ) pour véhicule automobile, ledit organe (15) comprenant une base (17) configurée pour supporter une source lumineuse (9) dudit dispositif, et au moins un dispositif dissipateur de chaleur (21 ) en liaison de conduction thermique à ladite base (17), ledit dispositif dissipateur de chaleur (21 ) comprenant une pluralité d'ailettes de dissipation thermique (19, 23), ladite base (17) présentant des grandes faces (30, 32) reliées par une tranche (34), chacune des ailettes (19, 23) s'étendant à partir de l'une desdites grandes faces (30, 32), ladite base (17) s'étendant en forme pour que des zones de jonction (35) d'au moins deux desdites ailettes (19, 23) avec ladite base (17) s'étendent dans des plans distincts. 1. Cooling member (15) for a lighting and / or signaling device (1) for a motor vehicle, said member (15) comprising a base (17) configured to support a light source (9) of said device, and at least one heat dissipating device (21) in thermal conduction connection with said base (17), said heat dissipating device (21) comprising a plurality of heat dissipating fins (19, 23), said base (17) having large faces (30, 32) connected by a wafer (34), each of the wings (19, 23) extending from one of said large faces (30, 32), said base (17) extending in shape so that junction areas (35) of at least two of said fins (19, 23) with said base (17) extend in separate planes.
2. Organe de refroidissement (15) selon la revendication 1 , dans lequel ladite base (17) comprend un fond (17a) et au moins une aile latérale (17b). The cooling member (15) of claim 1, wherein said base (17) comprises a bottom (17a) and at least one side wing (17b).
3. Organe de refroidissement (15) selon la revendication 2, dans lequel une première pluralité desdites ailettes (19) s'étend à partir dudit fond (17a) et/ou une seconde pluralité des dites ailettes (23) s'étend à partir de ladite aile latérale (17b). The cooling member (15) according to claim 2, wherein a first plurality of said fins (19) extends from said bottom (17a) and / or a second plurality of said fins (23) extends from of said lateral wing (17b).
4. Organe de refroidissement (15) selon la revendication 3, dans lequel l'une au moins desdites pluralités d'ailettes (19) est extrudée et/ou moulée avec ladite base (17). The cooling member (15) according to claim 3, wherein at least one of said plurality of fins (19) is extruded and / or molded with said base (17).
5. Organe de refroidissement (15) selon la revendication 3 ou 4, dans lequel l'une au moins desdites pluralités d'ailettes (23) est rapportée sur ladite base (17). 5. Cooling member (15) according to claim 3 or 4, wherein at least one of said plurality of fins (23) is attached to said base (17).
6. Organe de refroidissement (15) selon la revendication 5, dans lequel les ailettes (23) de la ou desdites pluralités d'ailettes rapportées sur ladite base (17) sont fixées unitairement sur ladite base (17). 6. A cooling member (15) according to claim 5, wherein the fins (23) of the said plurality of fin fins reported on said base (17) are fixed unitarily on said base (17).
7. Organe de refroidissement (15) selon la revendication 5, dans lequel au moins certaines des ailettes (23) de la ou desdites pluralités d'ailettes rapportées sur ladite base (17) sont fixées par paire sur ladite base (17) sous la forme d'une tôle pliée. The cooling member (15) according to claim 5, wherein at least some of the fins (23) of said plurality of fins on said base (17) are pairwise attached to said base (17) under the shape of a folded sheet.
8. Organe de refroidissement (15) selon la revendication 5, dans lequel au moins certaines des ailettes (23) de la ou desdites pluralités d'ailettes rapportées sur ladite base (17) sont fixées sur ladite base (17) sous la forme d'une tôle pliée en accordéon. The cooling member (15) according to claim 5, wherein at least some of the fins (23) of said plurality of fin fins attached to said base (17) are attached to said base (17) in the form of a sheet folded accordion.
9. Organe de refroidissement (15) selon la revendication 8, dans lequel ladite tôle est pliée en continu selon un ensemble de canaux adjacents (27) de convection de l'air. The cooling member (15) of claim 8, wherein said sheet is continuously folded into a plurality of adjacent air convection channels (27).
10. Organe de refroidissement (15) selon l'une des revendications 5 à 9, dans lequel des nervures sont prévues dans ladite base (17) pour accueillir lesdites ailettes (23). 10. A cooling member (15) according to one of claims 5 to 9, wherein ribs are provided in said base (17) for receiving said fins (23).
1 1 . Organe de refroidissement (15) selon l'une des revendications 1 à 10, dans lequel l'épaisseur desdites ailettes (23) est comprise entre 0,8 et 1 millimètre. 1 1. Cooling member (15) according to one of claims 1 to 10, wherein the thickness of said fins (23) is between 0.8 and 1 millimeter.
12. Organe de refroidissement (15) selon l'une des revendications 1 à 1 1 , dans lequel la distance entre lesdites ailettes (23) est comprise entre 4 et 6 millimètres. 12. The cooling member (15) according to one of claims 1 to 1 1, wherein the distance between said fins (23) is between 4 and 6 millimeters.
13. Dispositif d'éclairage et/ou de signalisation (1 ) pour véhicule automobile comprenant un organe de refroidissement selon l'une quelconque des revendications 1 à 12. 13. A lighting and / or signaling device (1) for a motor vehicle comprising a cooling element according to any one of claims 1 to 12.
14. Dispositif d'éclairage et/ou de signalisation (1 ) selon la revendication 13, comprenant un boîtier (3) fermé par une glace destinée à être traversée par un ou plusieurs faisceaux lumineux, le boîtier (3) logeant au moins un module optique (7) comprenant ladite source lumineuse (9) et un système optique (1 1 ) apte à modifier au moins un paramètre de la lumière générée par la source lumineuse (9) pour l'émission du ou des faisceaux lumineux par ledit dispositif d'éclairage, ledit dispositif dissipateur de chaleur (21 ) étant monté dans le volume disponible du boîtier (3) autour du module optique (7) et/ou du système optique (1 1 ). 14. A lighting and / or signaling device (1) according to claim 13, comprising a housing (3) closed by an ice to be traversed by a or more light beams, the housing (3) housing at least one optical module (7) comprising said light source (9) and an optical system (1 1) capable of modifying at least one parameter of the light generated by the light source ( 9) for the emission of the light beam (s) by said lighting device, said heat sink device (21) being mounted in the available volume of the housing (3) around the optical module (7) and / or the optical system (1 1).
15. Dispositif d'éclairage et/ou de signalisation (1 ) selon la revendication 14, dans lequel ladite base (17) présente un profil en U comprenant deux branches latérales (17b) reliées par une branche centrale (17a) et le module optique (7) est situé au niveau de ladite branche centrale (17a). 15. A lighting and / or signaling device (1) according to claim 14, wherein said base (17) has a U-shaped profile comprising two lateral branches (17b) connected by a central branch (17a) and the optical module. (7) is located at said central branch (17a).
EP14718433.7A 2013-04-19 2014-04-18 Cooling member and motor vehicle lighting or signalling device comprising such a member Withdrawn EP2986895A1 (en)

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FR1353628A FR3004787B1 (en) 2013-04-19 2013-04-19 COOLING DEVICE AND LIGHTING OR SIGNALING DEVICE FOR A MOTOR VEHICLE COMPRISING SUCH AN ORGAN
PCT/EP2014/058011 WO2014170484A1 (en) 2013-04-19 2014-04-18 Cooling member and motor vehicle lighting or signalling device comprising such a member

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US9857047B2 (en) 2018-01-02
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CN105121945A (en) 2015-12-02
WO2014170484A1 (en) 2014-10-23
FR3004787B1 (en) 2017-09-08

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