EP2187121A1 - Monoblock-Wärmeableiter für optische Module einer Beleuchtungs- und/oder Signalisierungsvorrichtung für Kraftfahrzeuge - Google Patents

Monoblock-Wärmeableiter für optische Module einer Beleuchtungs- und/oder Signalisierungsvorrichtung für Kraftfahrzeuge Download PDF

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Publication number
EP2187121A1
EP2187121A1 EP09174857A EP09174857A EP2187121A1 EP 2187121 A1 EP2187121 A1 EP 2187121A1 EP 09174857 A EP09174857 A EP 09174857A EP 09174857 A EP09174857 A EP 09174857A EP 2187121 A1 EP2187121 A1 EP 2187121A1
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EP
European Patent Office
Prior art keywords
fins
heat sink
base
finned heat
sink according
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.)
Granted
Application number
EP09174857A
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English (en)
French (fr)
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EP2187121B1 (de
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/de
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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 W02005116520 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 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.
  • each base comprises a plurality of fins.
  • 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. At least one of the connecting fins, but Preferably at least two to enhance the robustness of the junction between two adjacent pedestals, may be used together to form the 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 leg between two adjacent optical modules extends between bases that 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 that 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 advantageously interposed between two neighboring 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)
EP09174857.4A 2008-11-12 2009-11-03 Monoblock-Wärmeableiter für optische Module einer Beleuchtungs- und/oder Signalisierungsvorrichtung für Kraftfahrzeuge Active EP2187121B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0806325A FR2938316B1 (fr) 2008-11-12 2008-11-12 Dissipateur de chaleur monobloc pour modules optiques d'un dispositif d'eclairage et/ou de signalisation de vehicule automobile

Publications (2)

Publication Number Publication Date
EP2187121A1 true EP2187121A1 (de) 2010-05-19
EP2187121B1 EP2187121B1 (de) 2014-12-03

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EP (1) EP2187121B1 (de)
JP (1) JP5596328B2 (de)
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WO2012126739A1 (de) * 2011-03-21 2012-09-27 Osram Ag Beleuchtungseinrichtung und fahrzeugscheinwerfer mit beleuchtungseinrichtung
ITPI20110062A1 (it) * 2011-06-07 2012-12-08 Concetta Broccio "un dissipatore di calore modulare per dispositivi di conversione di energia quali diodi emettitori di luce a semiconduttore (led o laser led), celle fotovoltaiche a concentrazinoe, dispositivi ad effetto seebeck o micromotori termici"
WO2013037408A1 (en) * 2011-09-14 2013-03-21 Osram Ag Head light apparatus with led
EP2644990A3 (de) * 2012-03-26 2013-11-13 Toshiba Lighting&Technology Corporation Beleuchtungseinheit und Beleuchtungsvorrichtung
WO2014170484A1 (fr) * 2013-04-19 2014-10-23 Valeo Vision Organe de refroidissement et dispositif d'éclairage ou de signalisation de véhicule automobile comprenant un tel organe
DE102016105530A1 (de) 2015-03-31 2016-10-06 Varroc Lighting Systems, s.r.o. Kühler einer Lichtquelle
US20180142861A1 (en) * 2016-11-22 2018-05-24 Osram Sylvania Inc. Automotive LED Module with Heat Sink and Fan
CN109812770A (zh) * 2018-10-10 2019-05-28 重庆天华照明有限公司 散热装置、散热器、光学系统及led前照灯
US10830429B2 (en) 2015-04-15 2020-11-10 Hubbell Incorporated Luminaire housing
CN112241098A (zh) * 2019-07-18 2021-01-19 佳能株式会社 光源设备和投影仪
EP3809040A1 (de) * 2019-10-16 2021-04-21 Lumileds Holding B.V. Kühlkörper, beleuchtungsvorrichtung und verfahren zur herstellung einer beleuchtungsvorrichtung
US11028999B2 (en) 2016-03-09 2021-06-08 Hubbell Incorporated Perimeter luminaire
CN114178812A (zh) * 2021-12-21 2022-03-15 诺贝特空调（盐城）有限公司 一种应用于叠片式汽车散热器的装配机
FR3119665A1 (fr) * 2021-02-05 2022-08-12 Psa Automobiles Sa Feu de signalisation pour véhicule automobile comprenant un support de réflecteur optique apte à dissiper la chaleur émise par une source lumineuse.

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CN101825240B (zh) * 2010-05-18 2016-10-05 秦彪 Led灯及其灯具
JP6064488B2 (ja) * 2012-09-24 2017-01-25 スタンレー電気株式会社 自動二輪車用ヘッドランプ
JP2015215944A (ja) * 2014-05-07 2015-12-03 市光工業株式会社 車両用灯具
KR102340502B1 (ko) * 2015-04-22 2021-12-17 에스엘 주식회사 차량용 램프
CN105135320B (zh) * 2015-09-28 2017-10-20 台州探陆泽汽配有限公司 一种汽车大灯
JP6741413B2 (ja) * 2015-11-06 2020-08-19 シャープ株式会社 発光装置
JP6504219B2 (ja) 2017-09-20 2019-04-24 マツダ株式会社 車両の前部構造

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JP4595781B2 (ja) * 2005-10-17 2010-12-08 市光工業株式会社 車両用灯具
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WO2005116520A1 (de) 2004-05-25 2005-12-08 Hella Kgaa Hueck & Co. Scheinwerfer für ein kraftfahrzeuge
US7237936B1 (en) * 2005-05-27 2007-07-03 Gibson David J Vehicle light assembly and its associated method of manufacture
DE102005060736A1 (de) * 2005-12-16 2007-07-05 Schefenacker Vision Systems Germany Gmbh Scheinwerfer mit Kondensatabscheider
DE102006001711A1 (de) * 2006-01-13 2007-07-26 Audi Ag Beleuchtungseinrichtung für ein Kraftfahrzeug
EP1935715A1 (de) * 2006-12-19 2008-06-25 Ichikoh Industries, Ltd. Fahrzeugbeleuchtungsvorrichtung
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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012126739A1 (de) * 2011-03-21 2012-09-27 Osram Ag Beleuchtungseinrichtung und fahrzeugscheinwerfer mit beleuchtungseinrichtung
EP2533282A3 (de) * 2011-06-07 2015-06-24 Giuseppe Broccio Modularer Kühlkörper
ITPI20110062A1 (it) * 2011-06-07 2012-12-08 Concetta Broccio "un dissipatore di calore modulare per dispositivi di conversione di energia quali diodi emettitori di luce a semiconduttore (led o laser led), celle fotovoltaiche a concentrazinoe, dispositivi ad effetto seebeck o micromotori termici"
WO2013037408A1 (en) * 2011-09-14 2013-03-21 Osram Ag Head light apparatus with led
EP2644990A3 (de) * 2012-03-26 2013-11-13 Toshiba Lighting&Technology Corporation Beleuchtungseinheit und Beleuchtungsvorrichtung
US9194568B2 (en) 2012-03-26 2015-11-24 Toshiba Lighting & Technology Corporation Lighting unit and lighting device
US9857047B2 (en) 2013-04-19 2018-01-02 Valeo Vision Cooling member and motor vehicle lighting or signaling device comprising such a member
CN105121945A (zh) * 2013-04-19 2015-12-02 法雷奥照明公司 冷却部件以及包括该部件的机动车辆照明或信号指示装置
WO2014170484A1 (fr) * 2013-04-19 2014-10-23 Valeo Vision Organe de refroidissement et dispositif d'éclairage ou de signalisation de véhicule automobile comprenant un tel organe
FR3004787A1 (fr) * 2013-04-19 2014-10-24 Valeo Vision Organe de refroidissement et dispositif d'eclairage ou de signalisation de vehicule automobile comprenant un tel organe
DE102016105530A1 (de) 2015-03-31 2016-10-06 Varroc Lighting Systems, s.r.o. Kühler einer Lichtquelle
US10317038B2 (en) 2015-03-31 2019-06-11 Varroc Lighting Systems Cooler of a light source
US10830429B2 (en) 2015-04-15 2020-11-10 Hubbell Incorporated Luminaire housing
US11781739B2 (en) 2016-03-09 2023-10-10 HLI Solutions, Inc. Perimeter luminaire
US11028999B2 (en) 2016-03-09 2021-06-08 Hubbell Incorporated Perimeter luminaire
US20180142861A1 (en) * 2016-11-22 2018-05-24 Osram Sylvania Inc. Automotive LED Module with Heat Sink and Fan
US10337690B2 (en) * 2016-11-22 2019-07-02 Osram Sylvania Inc. Automotive LED module with heat sink and fan
CN109812770A (zh) * 2018-10-10 2019-05-28 重庆天华照明有限公司 散热装置、散热器、光学系统及led前照灯
CN112241098A (zh) * 2019-07-18 2021-01-19 佳能株式会社 光源设备和投影仪
EP3809040A1 (de) * 2019-10-16 2021-04-21 Lumileds Holding B.V. Kühlkörper, beleuchtungsvorrichtung und verfahren zur herstellung einer beleuchtungsvorrichtung
FR3119665A1 (fr) * 2021-02-05 2022-08-12 Psa Automobiles Sa Feu de signalisation pour véhicule automobile comprenant un support de réflecteur optique apte à dissiper la chaleur émise par une source lumineuse.
CN114178812A (zh) * 2021-12-21 2022-03-15 诺贝特空调（盐城）有限公司 一种应用于叠片式汽车散热器的装配机
CN114178812B (zh) * 2021-12-21 2023-05-12 威海凯美立电子有限公司 一种应用于叠片式汽车散热器的装配机

Also Published As

Publication number Publication date
FR2938316B1 (fr) 2013-09-13
EP2187121B1 (de) 2014-12-03
JP2010118344A (ja) 2010-05-27
FR2938316A1 (fr) 2010-05-14
JP5596328B2 (ja) 2014-09-24

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