EP2187121B1 - Single-piece heat sink for optical modules of a lighting and/or signalling device for an automobile - Google Patents

Single-piece heat sink for optical modules of a lighting and/or signalling device for an automobile Download PDF

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Publication number
EP2187121B1
EP2187121B1 EP09174857.4A EP09174857A EP2187121B1 EP 2187121 B1 EP2187121 B1 EP 2187121B1 EP 09174857 A EP09174857 A EP 09174857A EP 2187121 B1 EP2187121 B1 EP 2187121B1
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EP
European Patent Office
Prior art keywords
fins
base
heat dissipater
heat
joining
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.)
Active
Application number
EP09174857.4A
Other languages
German (de)
French (fr)
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EP2187121A1 (en
Inventor
Eric Mornet
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
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Valeo Vision SAS
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Publication of EP2187121A1 publication Critical patent/EP2187121A1/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
    • 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
    • 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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • 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
    • 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
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-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
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/30—Fog lights
    • 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 is in the field of lighting devices for motor vehicles in particular, and include the projectors fitted to such vehicles. More particularly, the invention relates to a cooling device of a light source equipping at least one optical module that includes the projector.
  • This cooling device is more precisely of the type arranged as a finned heat sink, for dissipating the heat produced by the light source, from a convection obtained by natural upward movement of the hot air with respect to gravity. along the fins.
  • Automotive headlamps are composed in their generality of a housing which is 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 light beams by the optical module.
  • the optical system comprises optical components which consist, for example, of a reflector, a lens, a scattering 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, such as its average reflection and / or direction.
  • 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 their integration inside the housing.
  • the optical system associated with the LEDs makes it possible returning the light directly emitted by the LED along a general direction of emergence of the light out of the optical module, which corresponds in particular to that of emission of the light beam by the projector.
  • the LEDs produce heat that is detrimental to their operation because the higher the LED temperature, the lower the luminous flux.
  • a finned heat sink arranged in radiator fin or the like.
  • Such a heat sink is in particular organized in support of the LED installed on an electronic control board, and comprises a plurality of generally flat fins.
  • This dissipator makes it possible to conduct the heat dissipated by the light source to the fins of the dissipator.
  • These fins make it possible to optimize the heat exchange that takes place between their surface and the air, which thus heats in contact with the fins.
  • a first difficulty to overcome is to find a compromise between the optimization of the heat exchange surface offered by the fins and the overall size of the optical module equipped with the means necessary for its cooling. It is also to be taken into account that the arrangement of the LED cooling means is dependent on the heat they generate according to their operating power, but also on the size.
  • the optical module When the optical module is designed to generate a beam requiring a high light intensity, such as for low beam, high beam or fog lamps.
  • the number of LEDs and / or the power required for their operation are high. As an indication, such a high operating power is likely to be between 5 W and 60 W.
  • the cooling means implemented are arranged to allow to remove the significant heat generated by the LEDs.
  • an operating power of 10 Watts (10 W) it is known from the document WO2005116520 to induce a forced passage of a flow of air along the fins, according to the orientation of the general direction of emergence of the light out of the optical module.
  • the operation of such an air flow in forced passage has the disadvantage of having to implement specific means to cause the airflow and increase the space inside the projector.
  • the optical module When the optical module is designed to generate a beam constituting a traffic light or the like, the number and power required for the operation of the LEDs are low. As an indication, in the case of a daylight type (DRL) light, the optical module is able to operate approximately 1 to 14 LEDs, for an operating power of 0.5 W at 6 W. For these LEDs dissipating less power, the heat dissipating means does not require the use of a forced air flow. The heat generated by the LEDs is transmitted by conduction to the fins, which are surrounded by the ambient air. The latter while warming is animated by an upward movement with respect to gravity and evacuates the heat. Such arrangements have the advantage of exonerating the cooling means of specific generating members of a forced air flow.
  • the document EP 1 935 715 A also shows such a device.
  • the object of the present invention is to provide a finned heat sink for equipping at least one optical module that comprises a lighting device and / or signaling for a motor vehicle, simple design, with limited space, and with efficient cooling performance.
  • the object of the present invention is a finned heat sink intended to equip a plurality of optical modules of a lighting and / or signaling device of a motor vehicle, the optical modules each comprising a light source associated with a system optical, this heat sink having a plurality of fins, the heat sink comprising a plurality of bases which are each carrying at least one light source, at least one of the fins of said plurality of fins being a fin junction constituting a junction member between two adjacent bases.
  • the junction of the bases by fins increases the heat exchange surface and to secure these bases. It is thus possible to increase the cooling performance with respect to a single support plate.
  • At least two fins ensure the junction between two adjacent bases.
  • the width of the heat sink is adjusted by varying the width of the connecting fins and thus determines a fixed positioning of the optical modules relative to each other.
  • the connecting fins with an orientation at least partly lateral, relative to the direction of emission of light by the optical module, there are fins whose length defines the transverse position of the light sources. This facilitates the design of the entire heat sink, particularly with respect to a lighting device and / or signaling of a motor vehicle intended to contain it, as well as the accuracy of the positioning of the light sources.
  • the optical module and finned heat sink are assembled to each other to form an assembly intended to be mounted inside a projector housing.
  • the optical module comprises a light source which is in particular mounted on an electronic control board and electrical power supply, and which is associated with an optical system generating a luminous flux oriented in a general direction of emergence of light out of the optical module.
  • the optical system comprises at least one optical component, for example consisting of a reflector, a lens, a diffusing element or a collimator, or even any other device able to modify at the same time.
  • least one of the parameters of the light generated by the light source such as its average reflection and / or direction.
  • the light source emits light radiation along a radiation axis, which is reflected towards said general direction of emergence of light from the optical module, corresponding in particular to the general direction of emission of a light beam by the projector.
  • At least the connecting fins, and even more preferably all the fins of the dissipator are oriented in their general plane substantially parallel, or even by analogy in a slightly inclined manner, in the direction of natural upward movement of the hot air heated by the heat produced by the light source in operation, which allows a more efficient evacuation of heat at the fins.
  • These fins are more particularly placed at a distance from each other by providing between them channels opening at their two ends and along which circulates the heated air in the natural direction of movement for cooling in contact with the fins.
  • the heated air is indeed driven by a natural upward movement relative to the gravity to circulate along the fins of the heat sink prior to its escape, to the inside of the projector housing in particular.
  • the light sources are light-emitting diodes whose operating power is preferably greater than 2 W (2 Watts).
  • the heatsink according to the present invention thus makes it possible to use light-emitting diodes, and more particularly with such power.
  • This heatsink can therefore be used to produce daylight-type lights and even beam-type lights, such as driving lights, dipped beam headlamps or fog lamps, without the need for systems employing fans or fans. forced circulation ducts of fluid.
  • the connecting fins are lateral fins.
  • the disposition of the lateral wings corresponds to a lateral position with respect to the bases and the direction of emergence of the light outside the optical module or modules of which these bases are carriers.
  • the lateral fins are likely to be oriented in their general plane either parallel to said direction of emergence of the light out of the optical module or modules, and preferably transversely, particularly orthogonally, to this direction of emergence.
  • the preferred arrangement is the orthogonal disposition to the emergence direction of the light.
  • the fins are oriented in their general plane parallel to the direction (S) of natural upward movement of the hot air generated by the heat produced by the light source during operation, while still being simpler.
  • the connecting fins are placed in interposition between two adjacent bases that they connect to one another. According to one variant of the invention, at least two to reinforce the robustness of the junction between two adjacent pedestals, are capable of being jointly exploited to form said connecting member.
  • the joining fins included in the heat sink of the present invention are common bases they connect them for cooling the sink by air and the light source which they are respectively carriers. More particularly, it is possible to consider that one or more optical modules are equipped with an elementary finned heat sink, which is connected to a neighboring elementary finned heat sink via connecting fins that they involve in common.
  • the connecting fins are likely to extend in height to increase the extension of lateral channels which delimit between them two by two and inside which circulates the air for the cooling of the light source and the dissipator.
  • the heat exchange surfaces offered by the connecting fins are optimized, while at the same time limiting their mass as much as possible by reducing their individual thickness.
  • the connecting fins are able to be of reduced thickness, and therefore of reduced mass, while being collectively sufficiently robust to form at least a pair of junction member between at least two adjacent bases.
  • the bases in particular individually carrying at least one optical module, may be of relatively low mass, being sufficiently robust to carry the optical module assigned to them.
  • at least the connecting fins which make up a junction member comprise a clearance in their general plane, which forms a reinforcing seat for the base. Such a reinforcing seat reinforces the robustness of the base in its general plan and its ability to support without deformation the optical module or modules which it carries.
  • the fins of the dissipator may be different sizes from each other or identical depending on the size in the lighting device and / or signaling.
  • the relative positions of two adjacent pedestals can be easily adapted according to the needs, depending on the capacity of the housing of the projector to receive the different optical modules, including in hard-to-reach areas of this housing.
  • the said relative positions of the bases can also be easily adapted according to the aesthetic effect sought for the projector, and / or according to the constraints relating to the environment close to the projector with regard to its location on a vehicle.
  • the relative positions of the bases relative to each other can be easily adjusted by being variable, both in height in the direction of naturally ascending movement of the hot air, and in depth in the general direction of emergence of the light out of the optical modules that they support. It is also possible to adjust the width of the heatsink by varying the width of the connecting fins.
  • the connecting fins therefore have a function of heat dissipation and junction, but also conformation of the dissipator width. By acting on the orientation, the positioning and the width of the connecting fins, can also, during the development of the heatsink, determine a fixed positioning of the modules relative to each other.
  • the lateral fins are preferably oriented in their general plane orthogonal to the general direction of emergence of the light out of the optical modules.
  • the lateral fins extend in their general plane on either side of the base which comprises them in the direction of naturally ascending movement of the hot air induced by the heat generated by the light source.
  • the base is preferably disposed substantially median position relative to the extension in height of the connecting fins. This substantially median position is likely to vary from one base to another which are interconnected by the same set of connecting fins.
  • the bases are advantageously offset in the general directions of emergence of the light out of the optical modules and / or in the direction of natural upward movement of the hot air.
  • Such an offset of the bases is indifferently an individual offset or a collective offset of a set of bases connected to each other.
  • the offset distances of the bases connected to each other are indifferently constant or variable from one base to another base.
  • At least one connector lug between two neighboring optical modules extends between pedestals which support respectively and which are interconnected.
  • This tab is likely to be arranged next or even more precisely along the connecting fins, extending in particular in their direction of extension corresponding to the junction between two bases they connect to one another.
  • an electronic assembly associates at least two neighboring optical modules and an electronic circuit for electrical connection of these optical modules.
  • This electronic assembly forms a one-piece assembly provided with mounting means on the heat sink, such as clipping or similar assembly means.
  • the optical modules are mounted on the pedestals that are assigned to them, the electronic circuit being mounted on the tab. It follows that the mounting of the optical modules on the heat sink are simple and easy to implement.
  • the connecting fins comprise a clearance in their general plane which forms a seat relief of the bases.
  • Such clearance makes it possible, if necessary, to reinforce the connection between the connecting fins and the corresponding base, as well as the robustness of this base for supporting the light source, or even the optical module at least, which is assigned to it.
  • free fins are disposed on a portion of the base which does not comprise a joining fin. These free fins are oriented in their general plane following the orientation of a plane corresponding to the extensions of the direction of natural upward movement of the hot air. Free fins means fins which are connected to only one base, and therefore do not constitute a connecting member between two bases.
  • the junction fins are lateral fins and said free fins are rear fins, with regard to the general direction of emergence of the light out of the optical modules.
  • This allows for a shallow projector.
  • the supports are nevertheless offset laterally and / or vertically relative to each other, so that the beams emitted by each LED do not interfere with each other.
  • Such an arrangement allows for narrower heatsinks.
  • the arrangement with lateral joining fins is preferred, depth limitation being preferred.
  • the free fins comprise a clearance in their general plane which forms a transverse base relief of the corresponding base.
  • This transverse seat relief is more particularly formed in correspondence with the seat provided by the connecting fins which optionally include a said lateral clearance to form such a seat.
  • the transverse base reliefs advantageously provide a supporting base of the corresponding base and columns that extend the base of the basement height.
  • the free fins delimit between them in the zone of the basement trapping channels and drainage of the heated air, and routing by natural upward movement of this heated air to cooling channels delimited between the columns and on which the drainage channels open.
  • the bases are preferably arranged substantially in the middle position with respect to the overall height of the free fins they respectively comprise. These arrangements are such that the height of the drainage channels corresponding substantially to half the height of the cooling channels.
  • the free fins comprise more particularly a clearance conforming dihedron in their general plan.
  • Such a base is likely to be sufficient in itself to strengthen the strength of the base, despite possibly its small thickness and the lack of clearance in the connecting fins.
  • such a finned heat sink comprising a base provided with such free fins is able to offer in itself a satisfactory cooling of the optical module which it carries for a relatively small given mass.
  • the base is likely to be thin to reduce its mass, and to be reinforced in its robustness thanks to the base which extends over the entire depth of the base, from back to front with regard to the general direction emergence of the light out of the optical module.
  • the arrangement of free fins in the base extended by the columns provides cooling of the optimized dissipator, from the formation of the channels of drainage of the heated air and conveying this heated air to the channels.
  • Such a finned heat sink is in particular an elementary finned heat sink which can be operated independently or connected to a neighboring elemental heat sink through connecting fins.
  • the thickness and / or the separation pitch between the connecting fins and / or the free fins are indifferently constant or variable.
  • the thickness and / or the separation pitch between the connecting fins and the thickness and / or the separation pitch between the free fins are indifferently identical or different.
  • the clearances that comprise the free fins particularly sparing the columns which extend in height the base of the light source, and preferably and preferably in the rear zone of the optical module supported if necessary as a whole by the base sitting on the base.
  • These columns advantageously extend in height from the base of the base to a zone of overflow in height of the light source, and if necessary preferentially the optical module as a whole.
  • the angle of the dihedron formed from the clearances in the free fins is preferably a right angle. However, it is conceivable that this angle is an open angle or a closed angle, or that the clearances comprise at least one curve stop, including the stop defining the upper zone of the base.
  • the underbody is likely to be shaped in cup according to at least one direction of inflection. A single inflection direction confers on the cup a cylindrical portion conformation, the axis of which is preferably oriented parallel to the general direction of emergence of the light from the optical module. Such a portion of a cylinder is in particular shaped as a cradle for receiving the light source, and even preferably for the optical module as a whole.
  • the structure of the elementary finned heat sink comprising at least the base provided with the free fins, or even the connecting fins, makes it possible to gather in a restricted volume a plurality of similar elementary dissipators, the assembly of which by the joining fins can be easily realized.
  • the efficiency of the heat sink elementary is optimized.
  • the implantation of the light source, and preferably the optical module as a whole, is easy to achieve with a rigorous positioning.
  • the free fins being spaced from each other, and the base being placed under the light source which it is carrying, the base of the free fins which together arrange the area of the base delimit between them trapping channels of the cold air located in lighting device and / or signaling and thereby dissipate the heat produced by the operating light source, and natural drainage of this cold air to cooling channels which are delimited between the columns and on which the channels of drainage open. More particularly, the heated air whose natural tendency is to rise according to the said upward movement is trapped inside the drainage channels, then is evacuated towards the cooling channels by circulating between the columns, and then is released. inside the housing after being warmed in contact with the columns that comprise the free fins.
  • the elementary fin heat sink comprising at least the base provided with the free fins, or even the connecting fins, can be easily adapted as required, in particular from a free extension of the columns according to the power of operation of the source. bright to cool.
  • Such an adaptation does not in any way impede the ease and freedom of implantation of the light source and preferably the optical module as a whole on the base supported by the bedrock, nor induces any specific development of the bedrock and / or if necessary the connecting fins as a result of an extension variation of the columns used for cooling the radiator by air.
  • the heat sink can be adapted without substantial structural modification, and without having to require the use of a forced passage of air naturally trapped inside the drainage channels then naturally routed for its release to the cooling channels which extend the drainage channels, whatever the adaptation of the extension dimensions of the columns and therefore the extension of the cooling channels. From a suitable extension of the columns in height, the heat sink is suitable for use not only for low power LEDs of the type used for traffic lights, but also for higher power LEDs of the type used. for high beams, fog lamps, low beam or even daytime running lights.
  • the assembly consisting of the base, the free fins and the connecting fins constitutes a heat sink elementary fins which can advantageously constitute a monobloc member easily achievable by molding, extrusion, folding strips and sealing of these strips between them or by any other irreversible assembly technique of the different elements of the heat sink to be assembled together.
  • the exemption of specific assembly members reported, such as fasteners arranged in screws, interlocking member or the like, and the ease of obtaining free fins and / or junction with at least one base make it possible to produce the elementary heat sink at a lower cost, to simplify the installation on the base of the light source and the associated electronic and / or optical components, and to facilitate the joining of two elementary heat sinks l to one another via the joining fins that they integrate.
  • the finned heat sink is advantageously constituted by a plurality of elementary fin heat sinks, which comprise at least one base provided with said free fins and which are able to be connected to each other via junction fins, at least two to two.
  • a plurality of elementary fin heat sinks are adapted to be successively connected to one another by means of junction fins which are common to them in pairs.
  • the latter also relates to such a heat sink elementary fins.
  • the elementary fin heat sinks each constitute a one-piece assembly.
  • a finned heat sink composed of a plurality of elementary finned heat sinks interconnected via the connecting fins is also advantageously a one-piece member.
  • the finned heat sink, comprising the various elementary heat dissipators, is formed integrally in one piece, the light sources being added later.
  • a finned heat sink of the present invention is preferably composed of a plurality of neighboring elementary fin heat sinks, which equip at least one optical module assigned thereto and which are interconnected via one another. the base and at least one connecting fin they have and which is common to them.
  • the finned heat sink according to the present invention can also be obtained by assembling different elemental heat sinks together, for example, by welding or by fixing the connecting fins.
  • the elemental heat sinks thus constitute modular elements that can be assembled to form a finned heat sink.
  • This assembly provides a finned heat sink formed of different elementary finned heat sinkers, each of these elementary finned heat sink being associated with only one of said pedestals and connected to a neighboring elementary fin heat sink. a joining vane, by welding or by a fixing means.
  • the present invention also relates to an optical module equipped with a finned heat sink having the features which have just been described, taken separately or in combination.
  • Such an optical module is in particular equipped with a heat sink elementary fins, including at least the base and the free fins.
  • a set of such optical modules is also likely to be recognizable in that it comprises a finned heat sink, which is in particular composed of a plurality of elementary heat dissipators which are interconnected by at least two cooling fins. junction.
  • Such a joining vane constitutes in particular a junction member between the bases that individually comprise the heat sinks elementary fins, which is common to them.
  • the present invention also relates to a motor vehicle headlight comprising a housing housing at least two optical modules and a heat sink according to the present invention, a first optical module being supported by a first base of said heat sink and a second optical module being supported by a second base of said dissipator.
  • an optical module 1 comprises a light source 2, for example as shown in these figures an LED 2 mounted on an electronic control card 3, and which is associated with an optical system 4.
  • This optical system 4 comprises in particular at least one an optical component, such as a reflector schematized in broken lines on the exemplary embodiments illustrated.
  • a reflector is placed behind the light source 2 to return the light beam R directly emitted by the light source 2 in a general direction of emergence D of the light out of the optical module 4.
  • the front and rear locations are to consider in view of this direction of emergence D of the light out of the optical module 4.
  • the optical module is equipped with a heat sink elementary fins 5.
  • the fins 6.7 these elementary heat dissipaters are distant from each other to provide channels 12,13,18 for the passage of air between them.
  • the hot air generated by the heat produced by the operating light source 2 flows inside the channels 12, 13, 18 along the fins 6, 7 for the cooling of the elemental heat sink.
  • the fins 6, 7 are oriented in their general plane vertically with respect to gravity, so that the heated air can circulate along their surface from a natural upward movement of this hot air.
  • the direction S of natural upward displacement of the hot air is oriented substantially orthogonal to the direction D of emergence of the light out of the optical module 1, after reflection of the light beam R directly from the light source 2.
  • Free fins 6 are more particularly oriented in their general plane according to the orientation of a plane which corresponds to an extension defined by the direction S of upward movement of the hot air and to the general direction of emergence D of the light out of the optical module 1.
  • Connecting fins represented on the variant embodiments illustrated on the fig.2 to fig.4 , are oriented in their general plane not only vertically, but also transversely, and more particularly orthogonally, to the general direction of emergence D of the light out of the optical module 1.
  • these connecting fins 7 are therefore lateral, and will be called lateral junction fins
  • the free fins 6 are at the rear of the bases, and will be called free rear fins.
  • the channels comprise rear channels 13 which are formed between the free rear fins 6 as illustrated in FIGS. fig.1 to fig.4 , and side channels 18 which are formed between the lateral connecting fins 7 as illustrated in FIGS. fig.2 to fig.4 .
  • the rear channels 13 and the side channels 18 are opening at each of their ends respectively lower and upper, so that the hot air is naturally driven within these rear channels 13 and side channels 18 from their side. lower end, to flow along the fins 6,7 and be discharged through the upper end of the rear channels 13 and side channels 18.
  • the hot air is discharged after its heating to the inside of the housing of the projector housing the optical modules 1 equipped with elemental heat sinks 5 which are assigned to them.
  • the free rear fins 6 have a clearance 8 conforming dihedral or "L".
  • This clearance 8 provides a base 9 of the free rear fins 6 which is extended at the rear of the optical module 1 by columns 10 of vertical extension.
  • the bases 9 that includes all the free rear fins 6 together form a base 11 for supporting the light source 2, or even and preferably all of the optical module 1.
  • the columns 10 which extend the base 11 formed by the free rear fins 6 can cool the elementary dissipator by heating the air flowing naturally between them.
  • the free rear fins 6 form between them in the zone of the base 11 of the channels 12 of trapping and natural drainage hot air towards cooling rear channels 13 which are formed between the columns 10.
  • the drainage channels 12 of the hot air open on the rear cooling channels 13 to naturally convey the heated air to the columns 10 to the cooling of the elemental heat sink.
  • the free rear fins 6 are connected to each other by a base 14 which is interposed between the base 11 formed by the base 9 of the free rear fins 6 and the light source 2.
  • the base 14 supports at least the light source 2, even also and preferably all of the optical module 1, otherwise at least one of the components of the optical system 4 such as a free rear reflector.
  • the height extension of the base 11, and the height position of the base 14 which enhances it, substantially correspond to a median location relative to the overall extension of the free rear fins 6.
  • the columns 10 of the free rear fins 6 are interconnected by a junction wall 15 disposed at the rear of the optical module 1, as shown in the embodiment variant illustrated in FIG. fig.1 .
  • the base 14 and the free rear fins 6, or even the rear wall 15, form a one-piece assembly that can be easily obtained by molding or by sealing the elements that make it up, from a material whose thermal resistivity is the highest. possible weak, such as metal or any other material with low thermal resistivity.
  • an elementary heat sink 5 of the present invention illustrated on the fig.2 to fig.4 it comprises not only the free rear fins 6 such that according to the embodiment shown on the fig.1 , but also the lateral junction fins 7.
  • These lateral junction fins 7 are oriented in their general plane vertically and perpendicularly to the free rear fins 6.
  • the lateral junction fins 7 extend in particular in their general plane orthogonal to the orientation. of the plane corresponding to an extension defined by the direction S of upward movement of the hot air and to the general direction of emergence D of the light out of the optical module 1.
  • These lateral fins of junction 7 are divided into two sets of fins 7 which are respectively arranged laterally on either side of the base 14, leaving the side channels 18 cooling.
  • the lateral connecting fins 7 extend in a dimension corresponding to the depth A of the underbody, and the hot air circulates between the lateral connecting fins 7 to increase the cooling of the heat sink, which itself dissipates the heat generated by the heat of the light source 2 in operation.
  • the lateral connecting fins 7 comprise clearances 16 similar to the clearances 8 that comprise the free rear fins 6, to participate in the formation of the base 9 of support of the light source 2 via the base 14.
  • the lateral wings junction 7 advantageously constitute with the base 14 and the free rear fins 6 a one-piece assembly.
  • the separation distance and the thickness of the free rear fins 6 and the lateral connecting fins 7 are indifferently identical or variable from one group of fins 6.7 to the other.
  • the lateral joining fins 7 are used to join two adjacent elementary heat sinks 5 which are assigned to the cooling of a respective light source 2.
  • Several elemental heat sinks 5 can thus be successively butted, to compose a global finned heat sink 17 advantageously consists of a one-piece assembly.
  • Such a one-piece assembly is formed in particular by molding, extrusion or sealing of the component members, such as elementary heat sinks 5 between them for example.
  • the elementary heat sinks 5 which are successively joined to each other are three in number. This number of elemental heat sinks 5 is given as an indication and does not constitute a limit on the number of elemental heat sinks 5 that can be assembled together.
  • At least one lateral joining vane 7 of a first heat sink 5 is common with a lateral joining vane 7 of a second neighboring heat sink 5 for their connection to each other.
  • the optical modules 1 are supported by the bases 14 that comprise these dissipators of elemental heat 5 aligned with a common plane P defined by these bases 14.
  • This plane P is generally oriented transversely, and in particular but not in a non-exclusive manner orthogonal to the orientation of the plane corresponding to a extension defined by the direction S of upward movement of the hot air and the general direction of emergence D of the light out of the optical modules 1.
  • the optical modules 1 are installed on the bases 14 of the three elementary heat sinks 5 following the same general support plane P. It is however possible to arrange the bases 14 in respective support planes that i are offset in height relative to each other, in the direction S of upward movement of the hot air. With regard to a said support plane P, the elementary heat dissipaters 5 are also capable of being offset with respect to each other according to the general directions of emergence D of the light outside the optical modules 1, such as on the exemplary embodiment illustrated.
  • this embodiment is only a variation of the present invention and that, in general, by virtue of the structure of the finned heat sink provided by the present invention, the elementary heat sinks 5 assembled together to each other through the lateral junction fins 7 which they comprise, are likely to be arranged in superposition, and / or laterally offset with respect to the general orientation of the lateral junction fins 7 and / or in a manner shifted in depth with respect to the emergence directions D of the light outside the optical modules 1.
  • each base is connected to the neighboring base by two connecting fins 7. As illustrated on the figure 5 these two fins are located above the connector lug 19, that is to say behind the connector lug 19, with respect to the direction D of light emission by the optical module.
  • these fins 7 are generally flat and have dimensions width, height and thickness, the latter being the smallest of their size.
  • the width of the fins 7 defines the distance between two adjacent bases 14, and therefore the positioning of an LED 2 and an optical module relative to another.
  • Such a heat sink can thus easily be designed to adapt to a given lighting and / or signaling device. Once the heat sink has been designed, precise assembly of the optical modules relative to one another can be ensured.
  • a connector lug 19 is according to a variant of the invention interposed between two adjacent optical modules 1, for their electrical connection to each other.
  • Such an electrical connection is capable of being a power supply of the light sources 2, and / or a supply of control signals coming from control means equipping the vehicle.
  • This connector lug 19 extends more particularly between the pedestals 14 neighbors which are connected via the lateral fins junction 7.
  • Such a connector lug 19 is likely to be directly carrier of electrical tracks 20 interconnecting the electronic boards 3 on which are mounted the light sources 2, or a substrate carrying such tracks 20.
  • the electronic boards 3 and such substrates constitute a monobloc element advantageously attached to the finned heat sink 17, such only by clipping or by similar means of assembly.

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  • 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)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Description

L'invention est du domaine des dispositifs d'éclairage pour véhicule automobile notamment, et relèvent notamment des projecteurs équipant de tels véhicules. Plus particulièrement, l'invention a pour objet un dispositif de refroidissement d'une source lumineuse équipant au moins un module optique que comporte le projecteur. Ce dispositif de refroidissement est plus précisément du type agencé en dissipateur de chaleur à ailettes, permettant de dissiper la chaleur produite par la source lumineuse, à partir d'une convection obtenue par déplacement ascendant naturel de l'air chaud au regard de la gravité le long des ailettes.The invention is in the field of lighting devices for motor vehicles in particular, and include the projectors fitted to such vehicles. More particularly, the invention relates to a cooling device of a light source equipping at least one optical module that includes the projector. This cooling device is more precisely of the type arranged as a finned heat sink, for dissipating the heat produced by the light source, from a convection obtained by natural upward movement of the hot air with respect to gravity. along the fins.

Les projecteurs automobiles sont composés dans leur généralité d'un boîtier qui est 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 faisceaux lumineux par le module optique. Le système optique comprend des composants optiques qui sont par exemple constitués d'un réflecteur, d'une lentille, d'un élément diffusant ou d'un collimateur, voire tout autre organe apte à modifier au moins l'un des paramètres de la lumière générée par la source lumineuse, tel que sa réflexion moyenne et/ou sa direction.Automotive headlamps are composed in their generality of a housing which is 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 light beams by the optical module. The optical system comprises optical components which consist, for example, of a reflector, a lens, a scattering 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, such as its average reflection and / or direction.

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 leur intégration à l'intérieur du boîtier. Le système optique associé aux DEL permet de renvoyer la lumière directement émise par la DEL suivant une direction générale d'émergence de la lumière hors du module optique, qui correspond notamment à celle d'émission du faisceau lumineux par le projecteur. Cependant en cours de fonctionnement, les DEL produisent de la chaleur qui est nuisible à leur fonctionnement, car plus une DEL monte en température, plus son flux lumineux diminue. Il est connu de munir les DEL d'un dissipateur de chaleur à ailettes, agencé en radiateur à ailettes ou organe analogue. Un tel dissipateur de chaleur est notamment organisé en support de la DEL installée sur une carte électronique de commande, et comporte une pluralité d'ailettes globalement planes. Ce dissipateur permet de conduire la chaleur dissipée par la source lumineuse aux ailettes du dissipateur. Ces ailettes permettent d'optimiser l'échange thermique qui a lieu entre leur surface et l'air, qui se réchauffe ainsi au contact des ailettes. Une première difficulté à surmonter est de trouver un compromis entre l'optimisation de la surface d'échange thermique offerte par les ailettes et l'encombrement global du module optique équipé des moyens nécessaires à son refroidissement. Il est aussi à prendre en compte que l'agencement des moyens de refroidissement des DEL est dépendant de la chaleur qu'elles génèrent selon leur puissance de fonctionnement, mais aussi de l'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 their integration inside the housing. The optical system associated with the LEDs makes it possible returning the light directly emitted by the LED along a general direction of emergence of the light out of the optical module, which corresponds in particular to that of emission of the light beam by the projector. However, during operation, the LEDs produce heat that is detrimental to their operation because the higher the LED temperature, the lower the luminous flux. It is known to provide the LEDs with a finned heat sink, arranged in radiator fin or the like. Such a heat sink is in particular organized in support of the LED installed on an electronic control board, and comprises a plurality of generally flat fins. This dissipator makes it possible to conduct the heat dissipated by the light source to the fins of the dissipator. These fins make it possible to optimize the heat exchange that takes place between their surface and the air, which thus heats in contact with the fins. A first difficulty to overcome is to find a compromise between the optimization of the heat exchange surface offered by the fins and the overall size of the optical module equipped with the means necessary for its cooling. It is also to be taken into account that the arrangement of the LED cooling means is dependent on the heat they generate according to their operating power, but also on the size.

Lorsque le module optique est conçu pour générer un faisceau nécessitant une forte intensité lumineuse, tel que pour des feux de croisement, des feux de route ou des feux anti-brouillard. Le nombre de DEL et/ou la puissance nécessaire à leur fonctionnement sont élevés. A titre indicatif, une telle puissance de fonctionnement élevée est susceptible d'être comprise entre 5 W et 60 W. Les moyens de refroidissement mis en oeuvre sont agencés pour permettre d'évacuer la chaleur importante générée par les DEL. Pour assurer un refroidissement efficace à l'intérieur du boîtier au-dessus d'une puissance de fonctionnement de 10 Watts (10 W), il est connu du document WO2005116520 d'induire un passage forcé d'un flux d'air le long des ailettes, suivant l'orientation de la direction générale d'émergence de la lumière hors du module optique. L'exploitation d'un tel flux d'air en passage forcé présente l'inconvénient d'avoir à mettre en oeuvre des moyens spécifiques pour provoquer le flux d'air et d'augmenter l'encombrement à l'intérieur du projecteur.When the optical module is designed to generate a beam requiring a high light intensity, such as for low beam, high beam or fog lamps. The number of LEDs and / or the power required for their operation are high. As an indication, such a high operating power is likely to be between 5 W and 60 W. The cooling means implemented are arranged to allow to remove the significant heat generated by the LEDs. To ensure efficient cooling inside the housing above an operating power of 10 Watts (10 W), it is known from the document WO2005116520 to induce a forced passage of a flow of air along the fins, according to the orientation of the general direction of emergence of the light out of the optical module. The operation of such an air flow in forced passage has the disadvantage of having to implement specific means to cause the airflow and increase the space inside the projector.

Lorsque le module optique est conçu pour générer un faisceau constitutif d'un feu de signalisation ou analogue, dont le nombre et la puissance nécessaire au fonctionnement des DEL sont faibles. A titre indicatif, dans le cas d'un feu de type éclairage diurne (ou DRL pour « Day Running Light »), le module optique est susceptible d'exploiter environ 1 à 14 DEL, pour une puissance de fonctionnement de 0,5 W à 6 W. Pour ces DEL dissipant moins de puissance, le moyen de dissipation de chaleur ne nécessite pas l'utilisation d'un flux d'air forcé. La chaleur générée par les DEL est transmise par conduction aux ailettes, qui sont entourées par l'air ambiant. Ce dernier en se réchauffant est animé d'un mouvement ascendant au regard de la gravité et évacue la chaleur. De telles dispositions présentent l'avantage d'exonérer les moyens de refroidissement d'organes spécifiques de génération d'un flux d'air forcé.When the optical module is designed to generate a beam constituting a traffic light or the like, the number and power required for the operation of the LEDs are low. As an indication, in the case of a daylight type (DRL) light, the optical module is able to operate approximately 1 to 14 LEDs, for an operating power of 0.5 W at 6 W. For these LEDs dissipating less power, the heat dissipating means does not require the use of a forced air flow. The heat generated by the LEDs is transmitted by conduction to the fins, which are surrounded by the ambient air. The latter while warming is animated by an upward movement with respect to gravity and evacuates the heat. Such arrangements have the advantage of exonerating the cooling means of specific generating members of a forced air flow.

Il a été proposé dans le document FR2853717 d'agencer un dissipateur de chaleur en plaque globalement conformée en escalier, pour ménager des paliers de soutien d'une pluralité de modules optiques, à l'intérieur d'un projecteur. Des organes pour évacuer la chaleur, tels que des ailettes, sont disposés à l'arrière de la plaque en s'étendant sous chacun des paliers. La chaleur produite par les DEL que comportent les modules optiques est transmise aux ailettes par l'intermédiaire de la plaque, en vue de son élimination.It was proposed in the document FR2853717 arranging a plate-shaped heat sink generally in a stepped manner to provide support bearings for a plurality of optical modules within a projector. Heat removal members, such as vanes, are disposed at the back of the plate extending under each of the bearings. The heat generated by the LEDs in the optical modules is transmitted to the fins through the plate for disposal.

Il a encore été proposé dans le document US20080158876 d'agencer un dissipateur de chaleur à ailettes affecté à un module optique, constitué d'une LED associée à un réflecteur et une lentille, de sorte que les ailettes soient disposées suivant leur plan général de manière à être balayées et traversées par un flux d'air. Selon ce document, le flux d'air est susceptible d'être généré par convection passive. Pour optimiser la surface d'échange de chaleur entre l'air et les ailettes, ces dernières sont disposées au pourtour d'un espace central de réception du module optique. Une plaque de graphite porteuse du module optique est maintenue dans cet espace en étant enserrée entre deux dissipateurs à ailettes élémentaires, qui sont assemblés l'un à l'autre suivant le plan général d'extension des ailettes.It was further proposed in the document US20080158876 arranging a finned heat sink assigned to an optical module, consisting of an LED associated with a reflector and a lens, so that the fins are arranged in their general plane so as to be scanned and traversed by a flux of 'air. According to this document, the airflow is likely to be generated by passive convection. To optimize the heat exchange surface between the air and the fins, the latter are arranged around a central receiving space of the optical module. A graphite plate carrying the optical module is maintained in this space by being sandwiched between two elementary fin dissipators, which are assembled to one another according to the general plane of extension of the fins.

Le document EP 1 935 715 A montre également un tel dispositif.The document EP 1 935 715 A also shows such a device.

Le but de la présente invention est de proposer un dissipateur de chaleur à ailettes destiné à équiper au moins un module optique que comporte un dispositif d'éclairage et/ou de signalisation pour véhicule automobile, de conception simple, avec un encombrement limité, et avec des performances de refroidissement efficace.The object of the present invention is to provide a finned heat sink for equipping at least one optical module that comprises a lighting device and / or signaling for a motor vehicle, simple design, with limited space, and with efficient cooling performance.

L'objet de la présente invention est un dissipateur de chaleur à ailettes destiner à équiper une pluralité de modules optiques d'un dispositif d'éclairage et/ou de signalisation de véhicule automobile, les modules optiques comprenant chacun une source lumineuse associée à un système optique, ce dissipateur de chaleur comportant une pluralité d'ailettes, ce dissipateur de chaleur comprenant une pluralité de socles qui sont chacun porteurs d'au moins une source lumineuse, au moins l'une des ailettes de ladite pluralité d'ailettes étant une ailette de jonction constituant un organe de jonction entre deux socles voisins. Ainsi, la jonction des socles par des ailettes permet d'accroître la surface d'échange thermique et de solidariser ces socles. On peut ainsi augmenter les performances de refroidissement par rapport à une plaque de support unique.The object of the present invention is a finned heat sink intended to equip a plurality of optical modules of a lighting and / or signaling device of a motor vehicle, the optical modules each comprising a light source associated with a system optical, this heat sink having a plurality of fins, the heat sink comprising a plurality of bases which are each carrying at least one light source, at least one of the fins of said plurality of fins being a fin junction constituting a junction member between two adjacent bases. Thus, the junction of the bases by fins increases the heat exchange surface and to secure these bases. It is thus possible to increase the cooling performance with respect to a single support plate.

Selon une variante de l'invention, au moins deux ailettes assurent la jonction entre deux socles voisins.According to a variant of the invention, at least two fins ensure the junction between two adjacent bases.

Selon une variante de réalisation, la largeur du dissipateur de chaleur est ajustée en jouant sur la largeur des ailettes de jonction et détermine ainsi un positionnement fixe des modules optiques les uns par rapport aux autres. Ainsi en disposant les ailettes de jonction avec une orientation au moins en partie latérale, par rapport au sens d'émission de la lumière par le module optique, on a des ailettes dont la longueur défini la position transversale des sources lumineuses. Cela facilite la conception de l'ensemble du dissipateur de chaleur, notamment par rapport à un dispositif d'éclairage et/ou de signalisation de véhicule automobile destiné à le contenir, ainsi que la précision du positionnement des sources lumineuses.According to an alternative embodiment, the width of the heat sink is adjusted by varying the width of the connecting fins and thus determines a fixed positioning of the optical modules relative to each other. Thus by arranging the connecting fins with an orientation at least partly lateral, relative to the direction of emission of light by the optical module, there are fins whose length defines the transverse position of the light sources. This facilitates the design of the entire heat sink, particularly with respect to a lighting device and / or signaling of a motor vehicle intended to contain it, as well as the accuracy of the positioning of the light sources.

Préférentiellement, le module optique et le dissipateur de chaleur à ailettes sont assemblés l'un à l'autre pour former un ensemble destiné à être monté à l'intérieur d'un boîtier du projecteur. Le module optique comprend une source lumineuse qui est notamment montée sur une carte électronique de commande et d'alimentation en énergie électrique, et qui est associée à un système optique générant un flux lumineux orienté suivant une direction générale d'émergence de la lumière hors du module optique. Selon un exemple préféré de réalisation, le système optique comprend au moins un composant optique, par exemple constitué d'un réflecteur, d'une lentille, d'un élément diffusant ou d'un collimateur, voire de tout autre organe apte à modifier au moins l'un des paramètres de la lumière générée par la source lumineuse, tel que sa réflexion moyenne et/ou sa direction. La source lumineuse émet un rayonnement lumineux suivant un axe de rayonnement, qui est réfléchi vers ladite direction générale d'émergence de la lumière hors du module optique, correspondant notamment à la direction générale d'émission d'un faisceau lumineux par le projecteur.Preferably, the optical module and finned heat sink are assembled to each other to form an assembly intended to be mounted inside a projector housing. The optical module comprises a light source which is in particular mounted on an electronic control board and electrical power supply, and which is associated with an optical system generating a luminous flux oriented in a general direction of emergence of light out of the optical module. According to a preferred embodiment, the optical system comprises at least one optical component, for example consisting of a reflector, a lens, a diffusing element or a collimator, or even any other device able to modify at the same time. least one of the parameters of the light generated by the light source, such as its average reflection and / or direction. The light source emits light radiation along a radiation axis, which is reflected towards said general direction of emergence of light from the optical module, corresponding in particular to the general direction of emission of a light beam by the projector.

Préférentiellement, au moins les ailettes de jonction, et encore préférentiellement l'ensemble des ailettes du dissipateur sont orientées dans leur plan général sensiblement parallèlement, voire par analogie de manière légèrement inclinée, selon le sens de déplacement ascendant naturel de l'air chaud réchauffé par la chaleur produite par la source lumineuse en fonctionnement, ce qui permet une évacuation de la chaleur dégagée au niveau des ailettes plus efficace. Ces ailettes sont plus particulièrement placées à distance les unes des autres en ménageant entre elles des canaux débouchant à leurs deux extrémités et le long desquels circule l'air réchauffé suivant le sens naturel de déplacement pour son refroidissement au contact des ailettes. L'air réchauffé est en effet animé d'un déplacement ascendant naturel au regard de la gravité pour circuler le long des ailettes du dissipateur de chaleur préalablement à son échappée, vers l'intérieur du boîtier du projecteur notamment.Preferably, at least the connecting fins, and even more preferably all the fins of the dissipator are oriented in their general plane substantially parallel, or even by analogy in a slightly inclined manner, in the direction of natural upward movement of the hot air heated by the heat produced by the light source in operation, which allows a more efficient evacuation of heat at the fins. These fins are more particularly placed at a distance from each other by providing between them channels opening at their two ends and along which circulates the heated air in the natural direction of movement for cooling in contact with the fins. The heated air is indeed driven by a natural upward movement relative to the gravity to circulate along the fins of the heat sink prior to its escape, to the inside of the projector housing in particular.

Préférentiellement, les sources lumineuses sont des diodes électroluminescentes, dont la puissance de fonctionnement est préférentiellement supérieure à 2 W (2 Watts). Le dissipateur selon la présente invention permet ainsi d'utiliser des diodes électroluminescentes, et plus particulièrement avec une telle puissance. On peut donc utiliser ce dissipateur pour réaliser des feux du type éclairage diurne et même des feux de type faisceau d'éclairage, tels que des feux route, des feux de croisement ou des feux antibrouillard, sans recourir à des systèmes employant des ventilateurs ou des conduits de circulation forcée de fluide.Preferably, the light sources are light-emitting diodes whose operating power is preferably greater than 2 W (2 Watts). The heatsink according to the present invention thus makes it possible to use light-emitting diodes, and more particularly with such power. This heatsink can therefore be used to produce daylight-type lights and even beam-type lights, such as driving lights, dipped beam headlamps or fog lamps, without the need for systems employing fans or fans. forced circulation ducts of fluid.

Préférentiellement, les ailettes de jonction sont des ailettes latérales. La disposition des ailettes latérales correspond à une position latérale par rapport aux socles et à la direction d'émergence de la lumière hors du ou des modules optiques dont ces socles sont porteurs. Les ailettes latérales sont susceptibles d'être orientées dans leur plan général soit parallèlement à la dite direction d'émergence de la lumière hors du ou des modules optiques, soit et de préférence transversalement, notamment orthogonalement, à cette direction d'émergence. La disposition préférée est la disposition orthogonale à la direction d'émergence de la lumière. Ainsi lors du positionnement du module optique dans le projecteur les ailettes sont orientées dans leur plan général parallèlement au sens (S) de déplacement ascendant naturel de l'air chaud généré par la chaleur produite par la source lumineuse en fonctionnement, tout en étant de réalisation plus simple.Preferably, the connecting fins are lateral fins. The disposition of the lateral wings corresponds to a lateral position with respect to the bases and the direction of emergence of the light outside the optical module or modules of which these bases are carriers. The lateral fins are likely to be oriented in their general plane either parallel to said direction of emergence of the light out of the optical module or modules, and preferably transversely, particularly orthogonally, to this direction of emergence. The preferred arrangement is the orthogonal disposition to the emergence direction of the light. Thus, during positioning of the optical module in the headlamp, the fins are oriented in their general plane parallel to the direction (S) of natural upward movement of the hot air generated by the heat produced by the light source during operation, while still being simpler.

Les ailettes de jonction sont placées en interposition entre deux socles voisins qu'elles relient l'un à l'autre. Selon l'une variante de l'invention, au moins deux pour conforter la robustesse de la jonction entre deux socles voisins, sont susceptibles d'être conjointement exploitées pour former le dit organe de jonction.The connecting fins are placed in interposition between two adjacent bases that they connect to one another. According to one variant of the invention, at least two to reinforce the robustness of the junction between two adjacent pedestals, are capable of being jointly exploited to form said connecting member.

Les ailettes de jonction que comprend le dissipateur de chaleur de la présente invention sont communes aux socles qu'elles relient entre eux pour le refroidissement de du dissipateur par l'air et de la source lumineuse dont ils sont respectivement porteurs. Plus particulièrement, il est susceptible de considérer qu'un ou plusieurs modules optiques sont équipés d'un dissipateur de chaleur à ailettes élémentaire, qui est relié à un dissipateur de chaleur à ailettes élémentaire voisin par l'intermédiaire d'ailettes de jonction qu'ils comportent en commun. Les ailettes de jonction sont susceptibles de s'étendre en hauteur pour accroître l'extension de canaux latéraux qu'elles délimitent entre elles deux à deux et à l'intérieur desquels circule l'air pour le refroidissement de la source lumineuse et du dissipateur. Les surfaces d'échange thermique offertes par les ailettes de jonction sont optimisées, tout en limitant au mieux leur masse à partir d'une réduction de leur épaisseur individuelle. Les ailettes de jonction sont aptes à être d'épaisseur réduite, et donc de masse réduite, tout en étant collectivement suffisamment robustes pour constituer au moins en couple un organe de jonction entre au moins deux socles voisins. Les socles, notamment individuellement porteurs d'au moins un module optique, peuvent être d'une masse relativement faible en étant suffisamment robustes pour porter le module optique qui leur est affecté. De préférence, au moins les ailettes de jonction qui composent un organe de jonction comportent un dégagement dans leur plan général, qui forme une assise de renfort pour le socle. Une telle assise de renfort conforte la robustesse du socle dans son plan général et son aptitude à soutenir sans déformation le ou les modules optiques dont il est porteur.The joining fins included in the heat sink of the present invention are common bases they connect them for cooling the sink by air and the light source which they are respectively carriers. More particularly, it is possible to consider that one or more optical modules are equipped with an elementary finned heat sink, which is connected to a neighboring elementary finned heat sink via connecting fins that they involve in common. The connecting fins are likely to extend in height to increase the extension of lateral channels which delimit between them two by two and inside which circulates the air for the cooling of the light source and the dissipator. The heat exchange surfaces offered by the connecting fins are optimized, while at the same time limiting their mass as much as possible by reducing their individual thickness. The connecting fins are able to be of reduced thickness, and therefore of reduced mass, while being collectively sufficiently robust to form at least a pair of junction member between at least two adjacent bases. The bases, in particular individually carrying at least one optical module, may be of relatively low mass, being sufficiently robust to carry the optical module assigned to them. Preferably, at least the connecting fins which make up a junction member comprise a clearance in their general plane, which forms a reinforcing seat for the base. Such a reinforcing seat reinforces the robustness of the base in its general plan and its ability to support without deformation the optical module or modules which it carries.

D'une manière générale, les ailettes du dissipateur peuvent être de tailles différentes les unes des autres ou identiques en fonction de l'encombrement dans le dispositif d'éclairage et/ou de signalisation.In general, the fins of the dissipator may be different sizes from each other or identical depending on the size in the lighting device and / or signaling.

Il en ressort que pour une masse globale donnée du dissipateur de chaleur, qui associe au moins les socles voisins et les ailettes de jonction, ses performances de refroidissement sont optimisées.It shows that for a given overall mass of the heat sink, which associates at least the neighboring pedestals and the connecting fins, its cooling performance is optimized.

En outre, les positions relatives de deux socles voisins peuvent être aisément adaptées selon les besoins, selon la capacité du boîtier du projecteur à recevoir les différents modules optiques, y compris dans des zones difficilement accessibles de ce boîtier. Les dites positions relatives des socles peuvent aussi être aisément adaptées selon l'effet esthétique recherché pour le projecteur, et/ou selon les contraintes relatives à l'environnement proche du projecteur au regard de son implantation sur un véhicule. Plus particulièrement, les positions relatives des socles les uns par rapport aux autres peuvent être aisément ajustées en étant variables, tant en hauteur suivant le sens de déplacement naturellement ascendant de l'air chaud, qu'en profondeur suivant la direction générale d'émergence de la lumière hors des modules optiques qu'ils supportent. Il est également possible d'ajuster la largeur du dissipateur en jouant sur la largeur des ailettes de jonction. Les ailettes de jonction ont donc une fonction de dissipation thermique et de jonction, mais encore de conformation du dissipateur en largeur. En jouant sur l'orientation, le positionnement et la largeur des ailettes de jonction, ont peut également, lors de l'élaboration du dissipateur, déterminer un positionnement fixe des modules les uns par rapport aux autres.In addition, the relative positions of two adjacent pedestals can be easily adapted according to the needs, depending on the capacity of the housing of the projector to receive the different optical modules, including in hard-to-reach areas of this housing. The said relative positions of the bases can also be easily adapted according to the aesthetic effect sought for the projector, and / or according to the constraints relating to the environment close to the projector with regard to its location on a vehicle. More particularly, the relative positions of the bases relative to each other can be easily adjusted by being variable, both in height in the direction of naturally ascending movement of the hot air, and in depth in the general direction of emergence of the light out of the optical modules that they support. It is also possible to adjust the width of the heatsink by varying the width of the connecting fins. The connecting fins therefore have a function of heat dissipation and junction, but also conformation of the dissipator width. By acting on the orientation, the positioning and the width of the connecting fins, can also, during the development of the heatsink, determine a fixed positioning of the modules relative to each other.

Plus particulièrement, les ailettes latérales sont de préférence orientées dans leur plan général orthogonalement à la direction générale d'émergence de la lumière hors des modules optiques. Notamment, les ailettes latérales s'étendent dans leur plan général de part et d'autre du socle qui les comporte suivant le sens de déplacement naturellement ascendant de l'air chaud induit par la chaleur générée par la source lumineuse.More particularly, the lateral fins are preferably oriented in their general plane orthogonal to the general direction of emergence of the light out of the optical modules. In particular, the lateral fins extend in their general plane on either side of the base which comprises them in the direction of naturally ascending movement of the hot air induced by the heat generated by the light source.

Plus particulièrement et pour conférer une meilleure répartition de la chaleur de la sources lumineuses vers les ailettes du dissipateur de chaleur, le socle est de préférence disposé en position sensiblement médiane par rapport à l'extension en hauteur des ailettes de jonction. Cette position sensiblement médiane est susceptible de varier d'un socle à un autre qui sont reliés entre eux par un même jeu d'ailettes de jonction.More particularly and to provide a better distribution of heat from the light sources to the fins of the heat sink, the base is preferably disposed substantially median position relative to the extension in height of the connecting fins. This substantially median position is likely to vary from one base to another which are interconnected by the same set of connecting fins.

Les socles sont avantageusement décalés suivant les directions générales d'émergence de la lumière hors des modules optiques et/ou suivant le sens de déplacement ascendant naturel de l'air chaud. Un tel décalage des socles est indifféremment un décalage individuel ou un décalage collectif d'un ensemble de socles reliés entre eux. Les distances de décalage des socles reliés entre eux sont indifféremment constantes ou variables d'un socle à un autre socle.The bases are advantageously offset in the general directions of emergence of the light out of the optical modules and / or in the direction of natural upward movement of the hot air. Such an offset of the bases is indifferently an individual offset or a collective offset of a set of bases connected to each other. The offset distances of the bases connected to each other are indifferently constant or variable from one base to another base.

Selon l'autre variante de l'invention, au moins une patte de connectique entre deux modules optiques voisins s'étend entre des socles qui les supportent respectivement et qui sont reliés entre eux. Cette patte est susceptible d'être disposée à côté voire plus précisément le long des ailettes de jonction, en s'étendant notamment selon leur direction d'extension correspondante à la jonction entre deux socles qu'elles relient l'un à l'autre.According to the other variant of the invention, at least one connector lug between two neighboring optical modules extends between pedestals which support respectively and which are interconnected. This tab is likely to be arranged next or even more precisely along the connecting fins, extending in particular in their direction of extension corresponding to the junction between two bases they connect to one another.

La patte de connectique est susceptible d'être constituée en elle-même d'une carte à pistes intégrées, ou d'être un organe de réception d'une telle carte. Selon une forme avantageuse de réalisation, un ensemble électronique associe au moins deux modules optiques voisins et un circuit électronique de liaison électrique de ces modules optiques. Cet ensemble électronique forme un ensemble monobloc muni de moyens de montage sur le dissipateur de chaleur, tel que par clipage ou moyens d'assemblage analogues. Les modules optiques sont montés sur les socles qui leurs sont affectés, le circuit électronique étant monté sur la patte. Il en ressort que les modalités de montage des modules optiques sur le dissipateur de chaleur sont simples et aisées à mettre en oeuvre.The connector leg is likely to be constituted in itself of an integrated track card, or to be a receiving member of such a card. According to an advantageous embodiment, an electronic assembly associates at least two neighboring optical modules and an electronic circuit for electrical connection of these optical modules. This electronic assembly forms a one-piece assembly provided with mounting means on the heat sink, such as clipping or similar assembly means. The optical modules are mounted on the pedestals that are assigned to them, the electronic circuit being mounted on the tab. It follows that the mounting of the optical modules on the heat sink are simple and easy to implement.

De plus, les modalités de raccordement des différents modules optiques à des moyens de commande de leur mise en oeuvre et/ou à une source d'alimentation électrique en sont simplifiées.In addition, the terms of connection of the various optical modules to control means of their implementation and / or a power source are simplified.

De préférence, les ailettes de jonction comportent un dégagement ménagé dans leur plan général qui forme un relief d'assise des socles. Un tel dégagement permet le cas échéant de conforter la liaison entre les ailettes de jonction et le socle correspondant, ainsi que la robustesse de ce socle pour le soutien de la source lumineuse, voire du module optique au moins, qui lui est affecté.Preferably, the connecting fins comprise a clearance in their general plane which forms a seat relief of the bases. Such clearance makes it possible, if necessary, to reinforce the connection between the connecting fins and the corresponding base, as well as the robustness of this base for supporting the light source, or even the optical module at least, which is assigned to it.

Selon une forme préférée de réalisation, des ailettes libres sont disposées sur une portion du socle qui ne comprend pas d'ailette de jonction. Ces ailettes libres sont orientées dans leur plan général suivant l'orientation d'un plan correspondant aux extensions du sens de déplacement ascendant naturel de l'air chaud. Par ailettes libres, on entend des ailettes qui ne sont reliées qu'à un seul socle, et qui ne constituent donc pas un organe de jonction entre deux socles.According to a preferred embodiment, free fins are disposed on a portion of the base which does not comprise a joining fin. These free fins are oriented in their general plane following the orientation of a plane corresponding to the extensions of the direction of natural upward movement of the hot air. Free fins means fins which are connected to only one base, and therefore do not constitute a connecting member between two bases.

Préférentiellement, les ailettes de jonctions sont des ailettes latérales et lesdites ailettes libres sont des ailettes arrière, au regard de la direction générale d'émergence de la lumière hors des modules optiques. Ceci permet de réaliser un projecteur peu profond. Il est néanmoins possible d'envisager d'autres dispositions, avec notamment des ailettes de jonction joignant l'arrière d'un support, au regard du sens d'émission de la lumière hors des modules optiques, à l'avant d'un autre module. Dans ce dernier cas, les supports sont néanmoins décalés latéralement et/ou verticalement les uns par rapport aux autres, pour que les faisceaux émis par chaque LED n'interfèrent pas entre eux. Une telle disposition permet de réaliser des dissipateurs plus étroits. Néanmoins, la disposition avec des ailettes de jonctions latérales est préférée, la limitation en profondeur étant préférée.Preferably, the junction fins are lateral fins and said free fins are rear fins, with regard to the general direction of emergence of the light out of the optical modules. This allows for a shallow projector. It is nevertheless possible to envisage other arrangements, in particular with connecting fins joining the back of a support, with regard to the direction of emission of the light out of the optical modules, in front of another module. In the latter case, the supports are nevertheless offset laterally and / or vertically relative to each other, so that the beams emitted by each LED do not interfere with each other. Such an arrangement allows for narrower heatsinks. Nevertheless, the arrangement with lateral joining fins is preferred, depth limitation being preferred.

Plus particulièrement, les ailettes libres comportent un dégagement ménagé dans leur plan général qui forme un relief d'assise transversale du socle correspondant. Ce relief d'assise transversal est plus particulièrement ménagé en correspondance avec l'assise offerte par les ailettes de jonction qui comportent éventuellement un dit dégagement latéral pour former une telle assise.More particularly, the free fins comprise a clearance in their general plane which forms a transverse base relief of the corresponding base. This transverse seat relief is more particularly formed in correspondence with the seat provided by the connecting fins which optionally include a said lateral clearance to form such a seat.

Les reliefs d'assise transversale ménagent avantageusement un soubassement de soutien du socle correspondant et des colonnes qui prolongent en hauteur le soubassement de ce socle.The transverse base reliefs advantageously provide a supporting base of the corresponding base and columns that extend the base of the basement height.

Plus particulièrement, les ailettes libres délimitent entre elles dans la zone du soubassement des canaux de piégeage et de drainage de l'air réchauffé, et d'acheminement par mouvement naturel ascendant de cet air réchauffé vers des canaux de refroidissement délimités entre les colonnes et sur lesquels les canaux de drainage débouchent.More particularly, the free fins delimit between them in the zone of the basement trapping channels and drainage of the heated air, and routing by natural upward movement of this heated air to cooling channels delimited between the columns and on which the drainage channels open.

Les socles sont préférentiellement disposés sensiblement en position médiane par rapport à la hauteur globale des ailettes libres qu'ils comportent respectivement. Ces dispositions sont telles que la hauteur des canaux de drainage correspondant sensiblement à la moitié de la hauteur des canaux de refroidissement.The bases are preferably arranged substantially in the middle position with respect to the overall height of the free fins they respectively comprise. These arrangements are such that the height of the drainage channels corresponding substantially to half the height of the cooling channels.

Les ailettes libres comportent plus particulièrement un dégagement les conformant en dièdre dans leur plan général. Les dégagements que comportent les ailettes ménagent ensemble le soubassement de soutien du socle porteur d'au moins la source lumineuse, voire et de préférence de l'ensemble du module optique ou d'au moins l'un de ses composants, tels qu'un réflecteur arrière et/ou une lentille placée à l'avant du module optique. Un tel soubassement est susceptible d'être suffisant en lui-même pour conforter la robustesse du socle, malgré éventuellement sa faible épaisseur et l'absence de dégagement ménagé dans les ailettes de jonction.The free fins comprise more particularly a clearance conforming dihedron in their general plan. The clearances provided by the fins together with the support base of the base carrying at least the light source, and preferably and preferably all of the optical module or at least one of its components, such as a rear reflector and / or a lens placed at the front of the optical module. Such a base is likely to be sufficient in itself to strengthen the strength of the base, despite possibly its small thickness and the lack of clearance in the connecting fins.

On notera qu'un tel dissipateur de chaleur à ailettes comportant un socle muni de telles ailettes libres est propre à offrir en lui-même un refroidissement satisfaisant du module optique dont il est porteur pour une masse donnée relativement faible. Le socle est susceptible d'être de faible épaisseur pour réduire sa masse, et d'être conforté dans sa robustesse grâce au soubassement qui s'étend sur la totalité de la profondeur du socle, d'arrière en avant au regard de la direction générale d'émergence de la lumière hors du module optique. Par ailleurs, l'agencement des ailettes libres en soubassement prolongé par les colonnes procure un refroidissement du dissipateur optimisé, à partir de la formation des canaux de drainage de l'air réchauffé et d'acheminement de cet air réchauffé vers les canaux. Un tel dissipateur de chaleur à ailettes constitue notamment un dissipateur de chaleur à ailettes élémentaire qui est susceptible d'être exploité indépendamment ou d'être relié à un dissipateur de chaleur élémentaire voisin par l'intermédiaire d'ailettes de jonction. La combinaison d'exploitation des ailettes libres, et plus particulièrement des canaux de drainage et des canaux de refroidissement, et des ailettes de jonction qui ménagent entre elles des canaux latéraux de refroidissement, permet d'optimiser le refroidissement de la source lumineuse pour une masse donnée du dissipateur de chaleur.It will be noted that such a finned heat sink comprising a base provided with such free fins is able to offer in itself a satisfactory cooling of the optical module which it carries for a relatively small given mass. The base is likely to be thin to reduce its mass, and to be reinforced in its robustness thanks to the base which extends over the entire depth of the base, from back to front with regard to the general direction emergence of the light out of the optical module. Furthermore, the arrangement of free fins in the base extended by the columns provides cooling of the optimized dissipator, from the formation of the channels of drainage of the heated air and conveying this heated air to the channels. Such a finned heat sink is in particular an elementary finned heat sink which can be operated independently or connected to a neighboring elemental heat sink through connecting fins. The combination of operating the free fins, and more particularly the drainage channels and cooling channels, and the connecting fins which form between them lateral cooling channels, optimizes the cooling of the light source for a mass heat sink data.

L'épaisseur et/ou le pas de séparation entre les ailettes de jonction et/ou les ailettes libres sont indifféremment constants ou variables. L'épaisseur et/ou le pas de séparation entre les ailettes de jonction et l'épaisseur et/ou le pas de séparation entre les ailettes libres sont indifféremment identiques ou différents.The thickness and / or the separation pitch between the connecting fins and / or the free fins are indifferently constant or variable. The thickness and / or the separation pitch between the connecting fins and the thickness and / or the separation pitch between the free fins are indifferently identical or different.

Les dégagements que comportent les ailettes libres ménagent plus particulièrement les colonnes qui prolongent en hauteur le soubassement de la source lumineuse, voire et de préférence dans la zone arrière du module optique soutenu le cas échéant dans son ensemble par le socle assis sur le soubassement. Ces colonnes s'étendent avantageusement en hauteur depuis la base du soubassement jusqu'à une zone de dépassement en hauteur de la source lumineuse, et le cas échéant préférentiellement du module optique dans son ensemble.The clearances that comprise the free fins particularly sparing the columns which extend in height the base of the light source, and preferably and preferably in the rear zone of the optical module supported if necessary as a whole by the base sitting on the base. These columns advantageously extend in height from the base of the base to a zone of overflow in height of the light source, and if necessary preferentially the optical module as a whole.

L'angle du dièdre formé à partir des dégagements ménagés dans les ailettes libres est préférentiellement un angle droit. Il est cependant envisageable que cet angle soit un angle ouvert ou un angle fermé, voire que les dégagements comportent au moins une arrête courbe, notamment l'arrête définissant la zone supérieure du soubassement. Le soubassement est susceptible d'être conformé en cupule suivant au moins une direction d'inflexion. Une direction d'inflexion unique confère à la cupule une conformation en portion de cylindre, dont l'axe est de préférence orienté parallèlement à la direction générale d'émergence de la lumière hors du module optique. Une telle portion de cylindre est notamment conformée en berceau de réception de la source lumineuse, voire et de préférence du module optique dans son ensemble.The angle of the dihedron formed from the clearances in the free fins is preferably a right angle. However, it is conceivable that this angle is an open angle or a closed angle, or that the clearances comprise at least one curve stop, including the stop defining the upper zone of the base. The underbody is likely to be shaped in cup according to at least one direction of inflection. A single inflection direction confers on the cup a cylindrical portion conformation, the axis of which is preferably oriented parallel to the general direction of emergence of the light from the optical module. Such a portion of a cylinder is in particular shaped as a cradle for receiving the light source, and even preferably for the optical module as a whole.

Dans la présente demande :

  • *) le sens de déplacement ascendant naturel de l'air se réchauffant est à prendre en compte au regard de la gravité, et du phénomène naturel connu selon lequel une masse d'air plus chaude que l'air ambiant est animée d'un mouvement naturel ascendant.
  • *) l'orientation des ailettes est à prendre en compte au regard de leur plan général d'extension. Les ailettes sont orientées de sorte qu'elles soient balayées par l'air se réchauffant, air réchauffé alors animé du dit mouvement naturel ascendant. Les ailettes arrière sont plus particulièrement orientées dans leur plan général parallèlement à un plan correspondant à la direction générale d'émergence de la lumière hors du module optique et à la direction générale du mouvement naturel ascendant de l'air chaud. La position arrière des colonnes est à prendre en compte par rapport à la position de la source lumineuse installée en soutien sur le socle et à la zone inverse avant d'émergence de la lumière hors du module optique. Les ailettes latérales sont disposées de part et d'autre du socle au regard de la position de la direction générale d'émergence de la lumière hors du module optique porté par ce socle. Les ailettes arrière et/ou les ailettes latérales sont préférentiellement réparties de façon homogène sur la partie du socle où elles sont reliées. Les ailettes arrière et/ou les ailettes latérales sont préférentiellement pleines en étant agencées en lame ou analogue, mais sont aussi susceptibles d'être évidées en étant formées à partir d'au moins deux lames juxtaposées et distantes l'une de l'autre. Les ailettes peuvent être formées par moulage, extrusion ou par pliage d'un feuillard par exemple.
  • *) L'orientation de la direction générale d'émergence de la lumière hors du module optique est à prendre en compte au regard de l'émergence de la lumière générée directement par la source lumineuse après modification de l'un au moins de ses paramètres par au moins un composant optique, tel que sa réflexion moyenne et/ou sa direction.
  • *) Le soubassement est un organe de soutien conjointement formé par la base des ailettes libres délimitées par leur arrête inférieure suivant le sens d'écoulement naturel de l'air réchauffé le long des ailettes libres, et l'arrête supérieure du dégagement que comporte ces dernières. Le soubassement s'étend dans une zone située au dessous de la source lumineuse, voire et de préférence du module optique, de sorte qu'il constitue un organe de soutien pour la source lumineuse, et préférentiellement pour l'un au moins d'un composant du système optique, voire et de préférence de l'ensemble du module optique. Le soubassement s'étend depuis la zone où sont fixées les ailettes libres au support vers la zone opposée du socle. Ainsi lorsque les ailettes libres sont des ailettes arrière, le soubassement s'étend depuis la zone arrière du socle vers la zone avant du socle, les zones arrière et avant étant à considérer par rapport à la direction vers l'avant d'émergence de la lumière hors du module optique.
In this application:
  • *) the direction of natural upward movement of the warming air is to be taken into account with regard to gravity, and the known natural phenomenon according to which a mass of air hotter than the ambient air is animated by a movement natural ascending.
  • *) the orientation of the fins is to be taken into account with regard to their general plan of extension. The fins are oriented so that they are swept by the warming air, heated air then animated by said natural ascending movement. The rear fins are more particularly oriented in their general plane parallel to a plane corresponding to the general direction of emergence of light out of the optical module and the general direction of the natural upward movement of hot air. The rear position of the columns is to be taken into account relative to the position of the light source installed in support on the base and the reverse zone before emergence of the light outside the optical module. The lateral wings are arranged on either side of the base in view of the position of the general direction of emergence of the light out of the optical module carried by this base. The rear wings and / or the lateral fins are preferably distributed homogeneously on the part of the base where they are connected. The rear wings and / or the lateral wings are preferably solid while being arranged in a blade or the like, but are also capable of being hollowed out by being formed from at least two blades juxtaposed and distant from each other. The fins may be formed by molding, extrusion or by folding a strip for example.
  • *) The orientation of the general direction of emergence of the light outside the optical module must be taken into account with regard to the emergence of the light generated directly by the light source after modification of at least one of its parameters by at least one optical component, such as its average reflection and / or direction.
  • *) The underbody is a support member jointly formed by the base of the free fins delimited by their lower edge in the direction of natural flow of the air heated along the free fins, and the upper stop of the release that these latest. The base extends in an area below the light source, and preferably and preferably the optical module, so that it constitutes a support member for the light source, and preferably for at least one component of the optical system, and preferably and all of the optical module. The underbody extends from the zone where the free fins are fixed to the support towards the opposite zone of the base. Thus, when the free fins are rear fins, the base extends from the rear area of the base to the front area of the base, the rear and front areas to be considered with respect to the forward direction of emergence of the light off the optical module.

La structure du dissipateur de chaleur à ailettes élémentaire comprenant au moins le socle muni des ailettes libres, voire aussi les ailettes de jonction, permet de rassembler dans un volume hors tout restreint une pluralité de dissipateurs élémentaires similaires dont l'assemblage par les ailettes de jonction peut être facilement réalisé. Pour une masse donnée, l'efficacité du dissipateur de chaleur élémentaire est optimisée. L'implantation de la source lumineuse, et de préférence du module optique dans son ensemble, est facile à réaliser avec un positionnement rigoureux.The structure of the elementary finned heat sink comprising at least the base provided with the free fins, or even the connecting fins, makes it possible to gather in a restricted volume a plurality of similar elementary dissipators, the assembly of which by the joining fins can be easily realized. For a given mass, the efficiency of the heat sink elementary is optimized. The implantation of the light source, and preferably the optical module as a whole, is easy to achieve with a rigorous positioning.

Les ailettes libres étant distantes les unes des autres, et le soubassement étant placé sous la source lumineuse dont il est porteur, la base des ailettes libres qui ménagent ensemble la zone du soubassement délimitent entre elles des canaux de piégeage de l'air froid situé en bas du dispositif d'éclairage et/ou de signalisation et de dissiper ainsi la chaleur produite par la source lumineuse en fonctionnement, et de drainage naturel de cet air froid vers des canaux de refroidissement qui sont délimités entre les colonnes et sur lesquels les canaux de drainage débouchent. Plus particulièrement, l'air réchauffé dont la tendance naturelle est de s'élever suivant le dit mouvement ascendant est piégé à l'intérieur des canaux de drainage, puis est évacué vers les canaux de refroidissement en circulant entre les colonnes, puis ensuite est libéré à l'intérieur du boîtier après avoir été réchauffé au contact des colonnes que comportent les ailettes libres.The free fins being spaced from each other, and the base being placed under the light source which it is carrying, the base of the free fins which together arrange the area of the base delimit between them trapping channels of the cold air located in lighting device and / or signaling and thereby dissipate the heat produced by the operating light source, and natural drainage of this cold air to cooling channels which are delimited between the columns and on which the channels of drainage open. More particularly, the heated air whose natural tendency is to rise according to the said upward movement is trapped inside the drainage channels, then is evacuated towards the cooling channels by circulating between the columns, and then is released. inside the housing after being warmed in contact with the columns that comprise the free fins.

Le dissipateur de chaleur à ailettes élémentaire comprenant au moins le socle muni des ailettes libres, voire aussi les ailettes de jonction, peut être aisément adapté selon les besoins, notamment à partir d'une extension libre des colonnes selon la puissance de fonctionnement de la source lumineuse à refroidir. Une telle adaptation ne fait en aucun cas obstacle à l'aisance et à la liberté d'implantation de la source lumineuse et de préférence du module optique dans son ensemble sur le socle soutenu par le soubassement, ni n'induit aucun aménagement spécifique du soubassement et/ou le cas échéant des ailettes de jonction en conséquence d'une variation d'extension des colonnes exploitées pour le refroidissement du radiateur par l'air. Le dissipateur de chaleur peut être adapté sans modification structurelle conséquente, et sans avoir à nécessiter l'usage d'un passage forcé de l'air naturellement piégé à l'intérieur des canaux de drainage puis naturellement acheminé pour sa libération vers les canaux de refroidissement qui prolongent les canaux de drainage, quelle que soit l'adaptation des dimensions d'extension des colonnes et donc de l'extension des canaux de refroidissement. A partir d'une extension adaptée des colonnes en hauteur, le dissipateur de chaleur est apte à être utilisé non seulement pour des DEL de faible puissance du type utilisées pour des feux de signalisation, mais aussi pour des DEL de plus forte puissance du type utilisées pour des feux de route, des feux anti-brouillard, des feux de croisement voire encore des feux diurnes de signalisation.The elementary fin heat sink comprising at least the base provided with the free fins, or even the connecting fins, can be easily adapted as required, in particular from a free extension of the columns according to the power of operation of the source. bright to cool. Such an adaptation does not in any way impede the ease and freedom of implantation of the light source and preferably the optical module as a whole on the base supported by the bedrock, nor induces any specific development of the bedrock and / or if necessary the connecting fins as a result of an extension variation of the columns used for cooling the radiator by air. The heat sink can be adapted without substantial structural modification, and without having to require the use of a forced passage of air naturally trapped inside the drainage channels then naturally routed for its release to the cooling channels which extend the drainage channels, whatever the adaptation of the extension dimensions of the columns and therefore the extension of the cooling channels. From a suitable extension of the columns in height, the heat sink is suitable for use not only for low power LEDs of the type used for traffic lights, but also for higher power LEDs of the type used. for high beams, fog lamps, low beam or even daytime running lights.

L'ensemble composé du socle, des ailettes libres et des ailettes de jonction constitue un dissipateur de chaleur à ailettes élémentaires qui peut avantageusement constituer un organe monobloc aisément réalisable par moulage, par extrusion, par pliage de feuillards et scellement de ces feuillards entre eux ou par toute autre technique d'assemblage irréversible des différents éléments du dissipateur de chaleur à assembler entre eux. L'exonération d'organes spécifiques d'assemblage rapportés, tels que des organes de fixation agencés en vis, en organe d'emboîtement ou organes analogues, et la facilité d'obtention des ailettes libres et/ou de jonction avec au moins un socle, permettent de réaliser le dissipateur de chaleur élémentaire à moindres coûts, de simplifier l'installation sur le socle de la source lumineuse et des composants électroniques et/ou optiques qui lui sont associés, et de faciliter la jonction de deux dissipateurs de chaleur élémentaires l'un à l'autre par l'intermédiaire des ailettes de jonction qu'ils intègrent.The assembly consisting of the base, the free fins and the connecting fins constitutes a heat sink elementary fins which can advantageously constitute a monobloc member easily achievable by molding, extrusion, folding strips and sealing of these strips between them or by any other irreversible assembly technique of the different elements of the heat sink to be assembled together. The exemption of specific assembly members reported, such as fasteners arranged in screws, interlocking member or the like, and the ease of obtaining free fins and / or junction with at least one base , make it possible to produce the elementary heat sink at a lower cost, to simplify the installation on the base of the light source and the associated electronic and / or optical components, and to facilitate the joining of two elementary heat sinks l to one another via the joining fins that they integrate.

Plus particulièrement, le dissipateur de chaleur à ailettes est avantageusement constitué d'une pluralité de dissipateurs de chaleur à ailettes élémentaires, qui comprennent au moins un socle muni des dites ailettes libres et qui sont aptes à être reliés entre eux par l'intermédiaire d'ailettes de jonction, au moins deux à deux. Une pluralité de dissipateurs de chaleur à ailettes élémentaires sont aptes à être successivement reliés les uns aux autres par l'intermédiaires d'ailettes de jonction qui leurs sont communes deux à deux. Selon un autre aspect de la présente invention, cette dernière porte aussi sur un tel dissipateur de chaleur à ailettes élémentaire.More particularly, the finned heat sink is advantageously constituted by a plurality of elementary fin heat sinks, which comprise at least one base provided with said free fins and which are able to be connected to each other via junction fins, at least two to two. A plurality of elementary fin heat sinks are adapted to be successively connected to one another by means of junction fins which are common to them in pairs. According to another aspect of the the present invention, the latter also relates to such a heat sink elementary fins.

Avantageusement, les dissipateurs de chaleur à ailettes élémentaires constituent chacun un ensemble monobloc. Un dissipateur de chaleur à ailettes composé d'une pluralité de dissipateurs de chaleur à ailettes élémentaires reliés entre eux par l'intermédiaire des ailettes de jonction constitue aussi avantageusement un organe monobloc. Préférentiellement, le dissipateur de chaleur à ailette, comportant les différents dissipateurs de chaleur élémentaire, est formé venu de matière en une seule pièce, les sources lumineuses étant ajoutées ultérieurement.Advantageously, the elementary fin heat sinks each constitute a one-piece assembly. A finned heat sink composed of a plurality of elementary finned heat sinks interconnected via the connecting fins is also advantageously a one-piece member. Preferably, the finned heat sink, comprising the various elementary heat dissipators, is formed integrally in one piece, the light sources being added later.

Plus particulièrement, un dissipateur de chaleur à ailettes de la présente invention est préférentiellement composé d'une pluralité de dissipateurs de chaleur à ailettes élémentaires voisins, qui équipent au moins un module optique qui leur est affecté et qui sont reliés entre eux par l'intermédiaire du socle et d'au moins une ailette de jonction qu'ils comportent et qui leur est commune.More particularly, a finned heat sink of the present invention is preferably composed of a plurality of neighboring elementary fin heat sinks, which equip at least one optical module assigned thereto and which are interconnected via one another. the base and at least one connecting fin they have and which is common to them.

Le dissipateur à ailette selon la présente invention peut également obtenu par assemblage de différents dissipateurs de chaleur élémentaires entre eux, par exemple, par soudage ou par fixation des ailettes de jonction. Les dissipateurs de chaleur élémentaires constituent ainsi des éléments modulaires susceptibles d'être assemblés pour former un dissipateur de chaleur à ailettes. On obtient par cet assemblage un dissipateur de chaleur à ailettes formé de différents dissipateur de chaleur à ailettes élémentaires, chacun de ces dissipateur de chaleur à ailettes élémentaires étant associé à un seul desdits socles et étant relié à un dissipateur de chaleur à ailette élémentaire voisin par une ailette de jonction, par soudage ou par un moyen de fixation.The finned heat sink according to the present invention can also be obtained by assembling different elemental heat sinks together, for example, by welding or by fixing the connecting fins. The elemental heat sinks thus constitute modular elements that can be assembled to form a finned heat sink. This assembly provides a finned heat sink formed of different elementary finned heat sinkers, each of these elementary finned heat sink being associated with only one of said pedestals and connected to a neighboring elementary fin heat sink. a joining vane, by welding or by a fixing means.

La présente invention porte aussi sur un module optique équipé d'un dissipateur de chaleur à ailettes comportant les particularités qui viennent d'être décrites, prises isolément ou en combinaison. Un tel module optique est notamment équipé d'un dissipateur de chaleur à ailettes élémentaire, associant notamment au moins le socle et les ailettes libres. Un ensemble de tels modules optiques est aussi susceptible d'être reconnaissable en ce qu'il comporte un dissipateur de chaleur à ailettes, qui est notamment composé d'une pluralité de dissipateurs de chaleur élémentaires qui sont reliés entre eux par au moins deux ailettes de jonction. Une telle ailette de jonction constitue notamment un organe de jonction entre les socles que comportent individuellement les dissipateurs de chaleur à ailettes élémentaires, qui leur est commune.The present invention also relates to an optical module equipped with a finned heat sink having the features which have just been described, taken separately or in combination. Such an optical module is in particular equipped with a heat sink elementary fins, including at least the base and the free fins. A set of such optical modules is also likely to be recognizable in that it comprises a finned heat sink, which is in particular composed of a plurality of elementary heat dissipators which are interconnected by at least two cooling fins. junction. Such a joining vane constitutes in particular a junction member between the bases that individually comprise the heat sinks elementary fins, which is common to them.

La présente invention porte aussi sur un projecteur pour véhicule automobile comprenant un boîtier logeant au moins deux modules optiques et un dissipateur selon la présente invention, un premier module optique étant supporté par un premier socle dudit dissipateur et un deuxième module optique étant supporté par un deuxième socle dudit dissipateur.The present invention also relates to a motor vehicle headlight comprising a housing housing at least two optical modules and a heat sink according to the present invention, a first optical module being supported by a first base of said heat sink and a second optical module being supported by a second base of said dissipator.

La présente invention sera mieux comprise à la lecture de la description qui va en être faite d'exemples de réalisation, en relation avec les figures des planches annexées, dans lesquelles :

  • La fig.1 est une illustration schématique en perspective d'un dissipateur de chaleur à ailettes élémentaire selon une première variante de réalisation de la présente invention, accompagnée d'un détail illustrant de profil une ailette que comprend ce dissipateur de chaleur élémentaire.
  • La fig.2 est une illustration schématique en perspective d'un dissipateur de chaleur à ailettes élémentaire selon une deuxième variante de réalisation de la présente invention.
  • Les fig.3 et fig.4 sont des illustrations d'un dissipateur de chaleur à ailettes élémentaire, selon une troisième variante de réalisation de la présente invention, respectivement vu en perspective de dessus et vue en perspective de dessous.
  • Les fig.5 à fig.7 sont des illustrations d'un dissipateur de chaleur à ailettes selon l'invention associant une pluralité de dissipateurs de chaleur à ailettes élémentaires, respectivement en vue de dessus, en vue de face et vu en perspective de dessus.
The present invention will be better understood on reading the description which will be given of exemplary embodiments, in relation to the figures of the appended plates, in which:
  • The fig.1 is a schematic perspective illustration of an elementary finned heat sink according to a first embodiment of the present invention, accompanied by a detail illustrating in profile a fin that comprises this elemental heat sink.
  • The fig.2 is a schematic perspective illustration of an elementary fin heat sink according to a second alternative embodiment of the present invention.
  • The fig.3 and fig.4 are illustrations of an elementary fin heat sink, according to a third embodiment of the present invention, respectively seen in perspective from above and perspective view from below.
  • The fig.5 to fig.7 are illustrations of a finned heat sink according to the invention associating a plurality of heat sink elementary fins, respectively in top view, in front view and viewed in perspective from above.

Sur les fig.1 à fig.4, un module optique 1 comprend une source lumineuse 2, par exemple comme cela est représenté dans ces figures une DEL 2 montée sur une carte électronique de commande 3, et qui est associée à un système optique 4. Ce système optique 4 comprend notamment au moins un composant optique, tel qu'un réflecteur schématisé en traits interrompus sur les exemples de réalisation illustrés. Un tel réflecteur est placé à l'arrière de la source lumineuse 2 pour renvoyer le rayon lumineux R directement émis par la source lumineuse 2 suivant une direction générale d'émergence D de la lumière hors du module optique 4. Les emplacements avant et arrière sont à considérer au regard de cette direction d'émergence D de la lumière hors du module optique 4. Pour refroidir la source lumineuse 2 en fonctionnement, le module optique est équipé d'un dissipateur de chaleur à ailettes élémentaire 5. Les ailettes 6,7 de ces dissipateurs de chaleur élémentaires sont distantes les unes des autres pour ménager des canaux 12,13,18 de passage d'air entre elles. L'air chaud généré par la chaleur produite par la source lumineuse 2 en fonctionnement s'écoule à l'intérieur des canaux 12,13,18 le long des ailettes 6,7 pour le refroidissement du dissipateur de chaleur élémentaire. Les ailettes 6,7 sont orientées dans leur plan général verticalement au regard de la gravité, de sorte que l'air réchauffé puisse circuler le long de leur surface à partir d'un mouvement naturel ascendant de cet air chaud. Le sens S de déplacement ascendant naturel de l'air chaud est orienté sensiblement orthogonalement à la direction D d'émergence de la lumière hors du module optique 1, après réflexion du rayon lumineux R directement issu de la source lumineuse 2. Des ailettes libres 6 sont plus particulièrement orientées dans leur plan général suivant l'orientation d'un plan qui correspond à une extension définie par le sens S de déplacement ascendant de l'air chaud et à la direction générale d'émergence D de la lumière hors du module optique 1. Des ailettes de jonction, représentées sur les variantes de réalisation illustrées sur les fig.2 à fig.4, sont orientées dans leur plan général non seulement verticalement, mais aussi transversalement, et plus particulièrement orthogonalement, à la direction générale d'émergence D de la lumière hors du module optique 1. Dans ces exemples illustrés, non limitatifs, ces ailettes de jonction 7 sont donc latérales, et seront dénommées ailettes latérales de jonction, et les ailettes libres 6 sont à l'arrière des socles, et seront dénommées ailettes arrière libres. Les canaux comprennent des canaux arrière 13 qui sont ménagés entre les ailettes arrière libres 6 tels qu'illustrés sur les fig.1 à fig.4, et des canaux latéraux 18 qui sont ménagés entre les ailettes latérales de jonction 7 tels qu'illustrés sur les fig.2 à fig.4. Les canaux arrière 13 et les canaux latéraux 18 sont débouchant à chacune de leurs extrémités respectivement inférieure et supérieure, de sorte que l'air chaud est naturellement entraîné à l'intérieur de ces canaux arrière 13 et de ces canaux latéraux 18 à partir de leur extrémité inférieure, pour s'écouler le long des ailettes 6,7 et être évacué par l'extrémité supérieure des canaux arrière 13 et des canaux latéraux 18. L'air chaud est évacué après son réchauffement vers l'intérieur du boîtier du projecteur logeant les modules optiques 1 équipés des dissipateurs de chaleur élémentaires 5 qui leurs sont affectés.On the fig.1 to fig.4 an optical module 1 comprises a light source 2, for example as shown in these figures an LED 2 mounted on an electronic control card 3, and which is associated with an optical system 4. This optical system 4 comprises in particular at least one an optical component, such as a reflector schematized in broken lines on the exemplary embodiments illustrated. Such a reflector is placed behind the light source 2 to return the light beam R directly emitted by the light source 2 in a general direction of emergence D of the light out of the optical module 4. The front and rear locations are to consider in view of this direction of emergence D of the light out of the optical module 4. To cool the light source 2 in operation, the optical module is equipped with a heat sink elementary fins 5. The fins 6.7 these elementary heat dissipaters are distant from each other to provide channels 12,13,18 for the passage of air between them. The hot air generated by the heat produced by the operating light source 2 flows inside the channels 12, 13, 18 along the fins 6, 7 for the cooling of the elemental heat sink. The fins 6, 7 are oriented in their general plane vertically with respect to gravity, so that the heated air can circulate along their surface from a natural upward movement of this hot air. The direction S of natural upward displacement of the hot air is oriented substantially orthogonal to the direction D of emergence of the light out of the optical module 1, after reflection of the light beam R directly from the light source 2. Free fins 6 are more particularly oriented in their general plane according to the orientation of a plane which corresponds to an extension defined by the direction S of upward movement of the hot air and to the general direction of emergence D of the light out of the optical module 1. Connecting fins, represented on the variant embodiments illustrated on the fig.2 to fig.4 , are oriented in their general plane not only vertically, but also transversely, and more particularly orthogonally, to the general direction of emergence D of the light out of the optical module 1. In these examples illustrated, non-limiting, these connecting fins 7 are therefore lateral, and will be called lateral junction fins, and the free fins 6 are at the rear of the bases, and will be called free rear fins. The channels comprise rear channels 13 which are formed between the free rear fins 6 as illustrated in FIGS. fig.1 to fig.4 , and side channels 18 which are formed between the lateral connecting fins 7 as illustrated in FIGS. fig.2 to fig.4 . The rear channels 13 and the side channels 18 are opening at each of their ends respectively lower and upper, so that the hot air is naturally driven within these rear channels 13 and side channels 18 from their side. lower end, to flow along the fins 6,7 and be discharged through the upper end of the rear channels 13 and side channels 18. The hot air is discharged after its heating to the inside of the housing of the projector housing the optical modules 1 equipped with elemental heat sinks 5 which are assigned to them.

Plus particulièrement selon la variante de réalisation d'un dissipateur de chaleur élémentaire 5 de la présente invention illustré sur la fig.1, les ailettes arrière libres 6 comportent un dégagement 8 les conformant en dièdre ou en « L ». Ce dégagement 8 ménage une base 9 des ailettes arrière libres 6 qui est prolongée à l'arrière du module optique 1 par des colonnes 10 d'extension verticale. Les bases 9 que comporte l'ensemble des ailettes arrière libres 6 forment conjointement un soubassement 11 de soutien de la source lumineuse 2, voire aussi et de préférence de l'ensemble du module optique 1. Les colonnes 10 qui prolongent le soubassement 11 formé par les ailettes arrière libres 6 permettent de refroidir le dissipateur élémentaire en réchauffant l'air qui s'écoule naturellement entre elles. Les ailettes arrière libres 6 ménagent entre elles dans la zone du soubassement 11 des canaux 12 de piégeage et de drainage naturel de l'air chaud vers des canaux arrière 13 de refroidissement qui sont ménagés entre les colonnes 10. Les canaux de drainage 12 de l'air chaud débouchent sur les canaux arrière 13 de refroidissement pour acheminer naturellement l'air réchauffé vers les colonnes 10 pour le refroidissement du dissipateur de chaleur élémentaire. Les ailettes arrière libres 6 sont reliées les unes aux autres par un socle 14 qui est interposé entre le soubassement 11 formé par la base 9 des ailettes arrière libres 6 et la source lumineuse 2. Le socle 14 supporte au moins la source lumineuse 2, voire aussi et de préférence l'ensemble du module optique 1, sinon au moins l'un des composants du système optique 4 tel qu'un réflecteur arrière libres. L'extension en hauteur du soubassement 11, et la position en hauteur du socle 14 qui le rehausse, correspondent sensiblement à un emplacement médian par rapport à l'extension globale des ailettes arrière libres 6. Accessoirement, les colonnes 10 des ailettes arrière libres 6 sont reliées entre elles par une paroi de jonction 15 disposée à l'arrière du module optique 1, tel que représenté sur la variante de réalisation illustrée sur la fig.1. Le socle 14 et les ailettes arrière libres 6, voire aussi la paroi arrière 15, forment un ensemble monobloc qui peut être aisément obtenu par moulage ou par scellement des éléments qui le composent, à partir d'un matériau dont la résistivité thermique est la plus faible possible, tel qu'un métal ou tout autre matériau à faible résistivité thermique.More particularly according to the alternative embodiment of an elementary heat sink 5 of the present invention illustrated on the fig.1 , the free rear fins 6 have a clearance 8 conforming dihedral or "L". This clearance 8 provides a base 9 of the free rear fins 6 which is extended at the rear of the optical module 1 by columns 10 of vertical extension. The bases 9 that includes all the free rear fins 6 together form a base 11 for supporting the light source 2, or even and preferably all of the optical module 1. The columns 10 which extend the base 11 formed by the free rear fins 6 can cool the elementary dissipator by heating the air flowing naturally between them. The free rear fins 6 form between them in the zone of the base 11 of the channels 12 of trapping and natural drainage hot air towards cooling rear channels 13 which are formed between the columns 10. The drainage channels 12 of the hot air open on the rear cooling channels 13 to naturally convey the heated air to the columns 10 to the cooling of the elemental heat sink. The free rear fins 6 are connected to each other by a base 14 which is interposed between the base 11 formed by the base 9 of the free rear fins 6 and the light source 2. The base 14 supports at least the light source 2, even also and preferably all of the optical module 1, otherwise at least one of the components of the optical system 4 such as a free rear reflector. The height extension of the base 11, and the height position of the base 14 which enhances it, substantially correspond to a median location relative to the overall extension of the free rear fins 6. Accessarily, the columns 10 of the free rear fins 6 are interconnected by a junction wall 15 disposed at the rear of the optical module 1, as shown in the embodiment variant illustrated in FIG. fig.1 . The base 14 and the free rear fins 6, or even the rear wall 15, form a one-piece assembly that can be easily obtained by molding or by sealing the elements that make it up, from a material whose thermal resistivity is the highest. possible weak, such as metal or any other material with low thermal resistivity.

Plus particulièrement selon la variante de réalisation d'un dissipateur de chaleur élémentaire 5 de la présente invention illustré sur les fig.2 à fig.4, celui-ci comporte non seulement les ailettes arrière libres 6 tel que selon la variante de réalisation représentée sur la fig.1, mais aussi les ailettes latérales de jonction 7. Ces ailettes latérales de jonction 7 sont orientées dans leur plan général verticalement et perpendiculairement aux ailettes arrière libres 6. Les ailettes latérales de jonction 7 s'étendent notamment dans leur plan général orthogonalement à l'orientation du plan correspondant à une extension définie par le sens S de déplacement ascendant de l'air chaud et à la direction générale d'émergence D de la lumière hors du module optique 1. Ces ailettes latérales de jonction 7 sont réparties en deux jeux d'ailettes 7 qui sont respectivement disposés latéralement de part et d'autre du socle 14, en ménageant les canaux latéraux 18 de refroidissement. Sur l'exemple de réalisation illustré, les ailettes latérales de jonction 7 s'étendent suivant une dimension correspondante à la profondeur A du soubassement, et l'air chaud circule entre les ailettes latérales de jonction 7 pour accroître le refroidissement du dissipateur de chaleur, qui lui-même dissipe la chaleur générée par la chaleur de la source lumineuse 2 en fonctionnement. Accessoirement, les ailettes latérales de jonction 7 comportent des dégagements 16 analogues aux dégagements 8 que comportent les ailettes arrière libres 6, pour participer à la formation du soubassement 9 de soutien de la source lumineuse 2 par l'intermédiaire du socle 14. Les ailettes latérales de jonction 7 constituent avantageusement avec le socle 14 et les ailettes arrière libres 6 un ensemble monobloc. La distance de séparation et l'épaisseur des ailettes arrière libres 6 et des ailettes latérales de jonction 7 sont indifféremment identiques ou variables d'un groupe d'ailettes 6,7 à l'autre.More particularly according to the alternative embodiment of an elementary heat sink 5 of the present invention illustrated on the fig.2 to fig.4 , it comprises not only the free rear fins 6 such that according to the embodiment shown on the fig.1 , but also the lateral junction fins 7. These lateral junction fins 7 are oriented in their general plane vertically and perpendicularly to the free rear fins 6. The lateral junction fins 7 extend in particular in their general plane orthogonal to the orientation. of the plane corresponding to an extension defined by the direction S of upward movement of the hot air and to the general direction of emergence D of the light out of the optical module 1. These lateral fins of junction 7 are divided into two sets of fins 7 which are respectively arranged laterally on either side of the base 14, leaving the side channels 18 cooling. In the exemplary embodiment illustrated, the lateral connecting fins 7 extend in a dimension corresponding to the depth A of the underbody, and the hot air circulates between the lateral connecting fins 7 to increase the cooling of the heat sink, which itself dissipates the heat generated by the heat of the light source 2 in operation. Incidentally, the lateral connecting fins 7 comprise clearances 16 similar to the clearances 8 that comprise the free rear fins 6, to participate in the formation of the base 9 of support of the light source 2 via the base 14. The lateral wings junction 7 advantageously constitute with the base 14 and the free rear fins 6 a one-piece assembly. The separation distance and the thickness of the free rear fins 6 and the lateral connecting fins 7 are indifferently identical or variable from one group of fins 6.7 to the other.

Sur les fig.5 à fig.7, les ailettes latérales de jonction 7 sont exploitées pour joindre deux dissipateurs de chaleur élémentaires 5 voisins qui sont affectés au refroidissement d'une source lumineuse 2 respective. Plusieurs dissipateurs de chaleur élémentaires 5 peuvent être ainsi successivement aboutés, pour composer un dissipateur de chaleur à ailettes global 17 avantageusement constitué d'un ensemble monobloc. Un tel ensemble monobloc est notamment formé par moulage, extrusion ou par scellement d'organes le composant, tels que les dissipateurs de chaleur élémentaires 5 entre eux par exemple. Sur l'exemple de réalisation illustré, les dissipateurs de chaleur élémentaires 5 qui sont joints successivement les uns aux autres sont au nombre de trois. Ce nombre de dissipateurs de chaleur élémentaires 5 joints est donné à titre indicatif et ne constituent pas une limite quant au nombre de dissipateurs de chaleurs élémentaires 5 qui peuvent être assemblés les uns aux autres. Plus particulièrement, au moins une ailette latérale de jonction 7 d'un premier dissipateur de chaleur 5 est commune avec une ailette latérale de jonction 7 d'un deuxième dissipateur de chaleur 5 voisin pour leur liaison l'un à l'autre. Dans le cas possible où l'ensemble des ailettes latérales de jonction 7 de deux dissipateurs de chaleur élémentaire 5 voisins est exploité pour leur jonction l'un à l'autre, les modules optiques 1 sont soutenus par les socles 14 que comportent ces dissipateurs de chaleur élémentaire 5 de manière alignée au regard d'un plan commun P défini par ces socles 14. Ce plan P est d'une manière générale orienté transversalement, et notamment mais pas de manière non exclusive orthogonalement à l'orientation du plan correspondant à une extension définie par le sens S de déplacement ascendant de l'air chaud et à la direction générale d'émergence D de la lumière hors des modules optiques 1. Sur l'exemple de réalisation illustré, les modules optiques 1 sont installés sur les socles 14 des trois dissipateurs de chaleur élémentaires 5 suivant un même plan général de soutien P. Il est cependant possible de disposer les socles 14 suivant des plans de soutien respectifs qui sont décalés en hauteur les uns par rapport aux autres, suivant le sens S de déplacement ascendant de l'air chaud. Au regard d'un dit plan de soutien P, les dissipateurs de chaleur élémentaires 5 sont aussi susceptibles d'être décalés les uns par rapport aux autres suivant les directions générales d'émergence D de la lumière hors des modules optiques 1, tel que sur l'exemple de réalisation illustré. On notera que cet exemple de réalisation n'est qu'une variante de la présente invention et que d'une manière générale, grâce à la structure du dissipateur de chaleur à ailettes proposé par la présente invention, les dissipateurs de chaleur élémentaires 5 assemblés les uns aux autres par l'intermédiaire des ailettes latérales de jonction 7 qu'ils comportent, sont susceptibles d'être disposés en superposition, et/ou de manière décalée latéralement au regard de l'orientation générale des ailettes latérales de jonction 7 et/ou de manière décalée en profondeur au regard des directions d'émergence D de la lumière hors des modules optiques 1. Comme on peut le voir sur les figures 5 et 7, chaque socle est relié au socle voisin par deux ailettes de jonction 7. Tel qu'illustré sur la figure 5, ces deux ailettes sont situées au dessus de la patte de connectique 19, c'est-à-dire en arrière de la patte de connectique 19, par rapport au sens D d'émission de la lumière par le module optique. Comme on peut également le voir, ces ailettes 7 sont globalement planes et ont pour dimensions une largeur, une hauteur et une épaisseur, cette dernière étant la plus petite de leur dimension. Dans l'exemple illustré, la largeur des ailettes 7 définit la distance entre deux socles voisins 14, et par conséquent le positionnement d'une DEL 2 et d'un module optique par rapport à un autre. Un tel dissipateur de chaleur peut ainsi facilement être conçu pour s'adapter à un dispositif d'éclairage et/ou de signalisation donné. Une fois le dissipateur de chaleur conçu, un assemblage précis des modules optiques les uns par rapport aux autres peut être assuré.On the fig.5 to fig.7 the lateral joining fins 7 are used to join two adjacent elementary heat sinks 5 which are assigned to the cooling of a respective light source 2. Several elemental heat sinks 5 can thus be successively butted, to compose a global finned heat sink 17 advantageously consists of a one-piece assembly. Such a one-piece assembly is formed in particular by molding, extrusion or sealing of the component members, such as elementary heat sinks 5 between them for example. In the exemplary embodiment illustrated, the elementary heat sinks 5 which are successively joined to each other are three in number. This number of elemental heat sinks 5 is given as an indication and does not constitute a limit on the number of elemental heat sinks 5 that can be assembled together. More particularly, at least one lateral joining vane 7 of a first heat sink 5 is common with a lateral joining vane 7 of a second neighboring heat sink 5 for their connection to each other. In the possible case where the set of lateral junction fins 7 of two adjacent elementary heat sinks 5 is used to join them to one another, the optical modules 1 are supported by the bases 14 that comprise these dissipators of elemental heat 5 aligned with a common plane P defined by these bases 14. This plane P is generally oriented transversely, and in particular but not in a non-exclusive manner orthogonal to the orientation of the plane corresponding to a extension defined by the direction S of upward movement of the hot air and the general direction of emergence D of the light out of the optical modules 1. In the exemplary embodiment illustrated, the optical modules 1 are installed on the bases 14 of the three elementary heat sinks 5 following the same general support plane P. It is however possible to arrange the bases 14 in respective support planes that i are offset in height relative to each other, in the direction S of upward movement of the hot air. With regard to a said support plane P, the elementary heat dissipaters 5 are also capable of being offset with respect to each other according to the general directions of emergence D of the light outside the optical modules 1, such as on the exemplary embodiment illustrated. It will be appreciated that this embodiment is only a variation of the present invention and that, in general, by virtue of the structure of the finned heat sink provided by the present invention, the elementary heat sinks 5 assembled together to each other through the lateral junction fins 7 which they comprise, are likely to be arranged in superposition, and / or laterally offset with respect to the general orientation of the lateral junction fins 7 and / or in a manner shifted in depth with respect to the emergence directions D of the light outside the optical modules 1. As can be seen in the figures 5 and 7 each base is connected to the neighboring base by two connecting fins 7. As illustrated on the figure 5 these two fins are located above the connector lug 19, that is to say behind the connector lug 19, with respect to the direction D of light emission by the optical module. As we can also see, these fins 7 are generally flat and have dimensions width, height and thickness, the latter being the smallest of their size. In the example illustrated, the width of the fins 7 defines the distance between two adjacent bases 14, and therefore the positioning of an LED 2 and an optical module relative to another. Such a heat sink can thus easily be designed to adapt to a given lighting and / or signaling device. Once the heat sink has been designed, precise assembly of the optical modules relative to one another can be ensured.

Une patte de connectique 19 est selon une variante de l'invention interposée entre deux modules optiques 1 voisins, en vue de leur liaison électrique les uns aux autres. Une telle liaison électrique est susceptible d'être une alimentation de puissance des sources lumineuses 2, et/ou une alimentation de signaux de commande en provenance de moyens de commande équipant le véhicule. Cette patte de connectique 19 s'étend plus particulièrement entre les socles 14 voisins qui sont reliés par l'intermédiaire des ailettes latérales de jonction 7. Une telle patte de connectique 19 est susceptible d'être directement porteuse de pistes électriques 20 reliant entre elles les cartes électroniques 3 sur lesquelles sont montées les sources lumineuses 2, ou d'un substrat porteur de telles pistes 20. De préférence, les cartes électroniques 3 et de tels substrats constituent un élément monobloc avantageusement rapporté sur le dissipateur de chaleur à ailettes 17, tel que par clipage ou par un moyen d'assemblage analogues.A connector lug 19 is according to a variant of the invention interposed between two adjacent optical modules 1, for their electrical connection to each other. Such an electrical connection is capable of being a power supply of the light sources 2, and / or a supply of control signals coming from control means equipping the vehicle. This connector lug 19 extends more particularly between the pedestals 14 neighbors which are connected via the lateral fins junction 7. Such a connector lug 19 is likely to be directly carrier of electrical tracks 20 interconnecting the electronic boards 3 on which are mounted the light sources 2, or a substrate carrying such tracks 20. Preferably, the electronic boards 3 and such substrates constitute a monobloc element advantageously attached to the finned heat sink 17, such only by clipping or by similar means of assembly.

Claims (13)

  1. Heat dissipater with fins (17) which is designed to equip a plurality of optical modules (1) of a motor vehicle lighting and/or signalling device, the optical modules (1) each comprising a source of light (2) which is associated with an optical system (4), this heat dissipater (17) comprising a plurality of fins (6, 7), a plurality of bases (14) which each bear at least one source of light (2), at least one of the fins out of the said plurality of fins being a joining fin (7) which constitutes a joining unit between two adjacent bases (14), characterised in that:
    - at least two fins (7) ensure the joining between two adjacent bases (14), and/or
    - a lug (19) for connection between two adjacent optical modules (1) extends between the bases (14) which support them respectively, and are connected to one another.
  2. Heat dissipater with fins according to claim 1, characterised in that the said joining fin(s) (7) is/are oriented on its/their general plane parallel to the direction (S) of natural ascending displacement of the hot air generated by the heat produced by the source of light (2) in operation.
  3. Heat dissipater with fins according to either of the preceding claims, characterised in that the width of the heat dissipater (17) is adjusted by altering the width of the joining fins (7), and thus determines fixed positioning of the optical modules (1) relative to one another.
  4. Heat dissipater with fins according to any one of the preceding claims, characterised in that the joining fin(s) is/are lateral fins (7) and is/are oriented on its/their general plane at right-angles to the general direction of emergence (D) of the light from the optical modules (1).
  5. Heat dissipater with fins according to any one of the preceding claims, characterised in that the joining fin(s) (7) extend(s) on its/their general plane on both sides of the base (14).
  6. Heat dissipater with fins according to any one of the preceding claims, characterised in that the bases (14) are offset according to the general directions of emergence (D) of the light from the optical modules, and/or according to the direction (S) of natural ascending displacement of the hot air.
  7. Heat dissipater with fins according to any one of the preceding claims, characterised in that the joining fin(s) (7) comprise(s) an undercut (16) provided in its/their general plane, which forms a relief for seating of the bases (14).
  8. Heat dissipater with fins according to any one of the preceding claims, characterised in that free fins (6) are arranged on a portion of the base (14) which does not comprise a joining fin, whilst being oriented on their general plane according to the orientation of a plane corresponding to the extensions of the direction (S) of natural ascending displacement of the hot air.
  9. Heat dissipater with fins according to claim 8, characterised in that the free fins (6) comprise transverse seating reliefs which provide a substructure (11) for support of the corresponding base (14), and columns (10) which extend the height of the substructure (11) in the rear area of this base (14), with the said free fins (6) delimiting between one another in the area of the substructure (11) channels (12) for trapping and draining of the hot air, and for conveying of this hot air by natural ascending movement to cooling channels (13) which are delimited between the columns (10), and into which the drainage channels (12) open.
  10. Heat dissipater with fins according to claim 8 or 9, characterised in that the said joining fins are lateral fins, and the said free fins are rear fins.
  11. Heat dissipater with fins according to any one of the preceding claims, characterised in that it is formed by a unit in a single piece.
  12. Heat dissipater with fins according to claim 11, characterised in that it is formed by different heat dissipaters (5) with elementary fins, each of these heat dissipaters with elementary fins being associated with a single one of the said bases (14), and being connected to an adjacent heat dissipater with an elementary fin by means of a joining fin, by welding or by a securing means.
  13. Motor vehicle headlight comprising at least two optical modules (1) and a dissipater according to any one of claims 1 to 12, a first optical module being supported by a first base of the said dissipater, and a second optical module being supported by a second base of the said dissipater.
EP09174857.4A 2008-11-12 2009-11-03 Single-piece heat sink for optical modules of a lighting and/or signalling device for an automobile Active EP2187121B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0806325A FR2938316B1 (en) 2008-11-12 2008-11-12 MONOBLOC HEAT DISSIPATOR FOR OPTICAL MODULES OF A LIGHTING AND / OR SIGNALING DEVICE FOR A MOTOR VEHICLE

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EP2187121A1 EP2187121A1 (en) 2010-05-19
EP2187121B1 true EP2187121B1 (en) 2014-12-03

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FR2938316B1 (en) 2013-09-13
JP2010118344A (en) 2010-05-27
EP2187121A1 (en) 2010-05-19
FR2938316A1 (en) 2010-05-14
JP5596328B2 (en) 2014-09-24

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