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EP2532949B1 - Lighting and/or signalling device with built-in radiator and heat sink - Google Patents

Lighting and/or signalling device with built-in radiator and heat sink Download PDF

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Publication number
EP2532949B1
EP2532949B1 EP12170716.0A EP12170716A EP2532949B1 EP 2532949 B1 EP2532949 B1 EP 2532949B1 EP 12170716 A EP12170716 A EP 12170716A EP 2532949 B1 EP2532949 B1 EP 2532949B1
Authority
EP
European Patent Office
Prior art keywords
radiator
series
enclosure
fins
sink
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
EP12170716.0A
Other languages
German (de)
French (fr)
Other versions
EP2532949A2 (en
EP2532949A3 (en
Inventor
Christine Roucoules
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP2532949A2 publication Critical patent/EP2532949A2/en
Publication of EP2532949A3 publication Critical patent/EP2532949A3/en
Application granted granted Critical
Publication of EP2532949B1 publication Critical patent/EP2532949B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/49—Attachment of the cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/60—Heating of lighting devices, e.g. for demisting

Definitions

  • the present invention relates to a lighting and / or signaling device for a vehicle and more particularly relates to elements whose mission is to dissipate heat originating from a light source that the device comprises.
  • Lighting and / or signaling devices for vehicles mainly consist of a light source, a housing and a transparent element through which the light from the light source is projected, the transparent element delimiting with the housing an enclosure.
  • LEDs For questions of luminance and style, one or more light-emitting diodes, called LEDs, should be used. To ensure sufficient luminance on the road, the powers dissipated by the LEDs are of the order of 10 Watt.
  • Heat is thus released from the light source and if it is not dissipated, it can cause deformation of the housing or of the transparent element or even lower the quality of a light flux emitted by the LEDs.
  • cooling systems offering natural convection are heavy and bulky, while cooling systems offering forced convection use fans which pose a problem of cost, noise, dust and reliability.
  • a lighting and / or signaling device comprising the characteristics of the preamble of claim 1 is for example known from the document US2007 / 0008727A1 .
  • the aim of the present invention is therefore to resolve the drawbacks described above mainly by proposing a technical solution for optimizing and improving the efficiency of cooling in natural convection and reducing the mass of the radiators on board the lighting devices and / or signaling devices equipped with such a solution.
  • the invention provides for this purpose a lighting and / or signaling device comprising a housing, a transparent element defining with the housing an enclosure, a light source and at least one radiator in thermal contact with said source.
  • the radiator extends into the enclosure and the device comprises at least one heat sink, called the first dissipator, which performs a heat exchange between an air contained in the enclosure and a flow of air outside the enclosure. 'pregnant.
  • the radiator has a part for capturing a heat given off by said source and an advanced part for dispersing said heat.
  • the term “advanced” is understood to mean the fact that said dispersion part is located in the internal volume at a distance from the transparent element of between 5 mm and 50 mm.
  • the radiator brings a maximum of heat close to the glass in order, in particular, to limit the phenomena of condensation on the glass.
  • This also makes it possible to improve the dissipation of heat at the level of the dispersion part because the latter is located near the transparent element, the external face of the latter being directly in contact with the flow of outside air.
  • the first dissipator thus represents a cold surface cooled by the flow of outside air and which allows the air located inside the enclosure to cool.
  • the air inside the enclosure thus circulates from the radiator to the first heat sink before returning to the radiator, carrying out a circulation loop, thus creating a phenomenon of natural convection inside the enclosure. promoting the cooling of the air inside the enclosure.
  • the heat sink and the first heat sink are separate.
  • the first heatsink comprises a first series of fins, a second series of fins and a base interposed between the first series and the second series, said base being integral with the housing while the first series of fins extends into a surrounding volume where the flow of external air circulates, the second series of fins extends into a volume delimited by the enclosure, called the internal volume.
  • the fins of the first heat sink are thermally connected to the base and optimize the heat exchange between the hot air present inside the case and the cold air present outside the case.
  • the first heat sink is located above the heat sink. In this way, a flow of air inside the enclosure will be created, the hot air near the radiator rising towards the cold source represented by the first dissipator, then descending once cooled towards the radiator, thus making a loop. traffic.
  • the first heat sink is located in the extension of the heat sink.
  • at least one axis perpendicular to a side wall of the case on which the first heat sink is located intersects both the heat sink and the first heat sink.
  • at least one axis parallel to the transparent element intersects both the heat sink and the first heat sink.
  • said device comprises a first duct arranged above the enclosure and capable of guiding the flow of outside air towards the first dissipator, the first duct comprising a first exhaust means allowing the flow of air. outside air to come out of the first duct.
  • the first discharge means is, in particular, a grid and thus allows the flow of outside air to be renewed and to remain at a temperature allowing the cooling of the first heat sink.
  • said device comprises a second heat sink located below the heat sink and which performs an exchange thermal between the air contained in the enclosure and the flow of outside air.
  • the second device is separate from the radiator and from the first dissipator. The presence of the second heat sink, in addition to the first heat sink, can thus increase the cooling capacity of the air contained inside the enclosure.
  • the second heat sink comprises a first series of fins, a second series of fins and a base interposed between the first series and the second series, said base being integral with the housing while the first series of fins extends in a surrounding volume where the flow of outside air circulates, the second series of fins extends in a volume delimited by the enclosure.
  • the fins of the second heat sink are thermally connected to the base and optimize the heat exchange between the hot air present inside the case and the cold air present outside the case.
  • said device comprises a second duct disposed below the enclosure and capable of guiding the flow of outside air towards the second dissipator, and in which the second duct comprises a second discharge means allowing the flow of air to come out of the second duct.
  • the second discharge means is, in particular, a grid and thus allows the flow of outside air to be renewed and to remain at a temperature allowing the cooling of the first dissipator.
  • a thermal conduction means is connected on one side to the heat sink and on the other side to the second heat sink.
  • the thermal conduction means can thus improve the heat exchange between the heat sink and the second heat sink.
  • the thermal conduction means is, in particular, a heat pipe or, for example, a thermally conductive strip.
  • a portion of the heat sink (s) extends at a distance from the transparent element of less than 50 mm.
  • part of the base of the heat sink (s) is molded into the housing.
  • part of the base of the heat sink (s), in particular a peripheral part of the base of the heat sink (s) is covered with a material constituting the housing, or advantageously embedded in this material.
  • the base of the heat sink (s) is attached to the housing.
  • the case comprises an opening for receiving the heat sink (s), the latter comprising a means for fixing to the case, for example, holes suitable for receiving a fixing element, in particular screws.
  • the base of the heat sink (s) has ventilations capable of circulating the flow of outside air inside the enclosure.
  • the base of the heat sink (s) has openings allowing entry into the enclosure of the external air flow.
  • the area of the case where the heat sink (s) is located is used to place the ventilations.
  • These ventilations make it possible to further cool the air contained in the enclosure, by allowing the flow of outside air to penetrate inside the enclosure.
  • the housing may also include such ventilations, in particular near the base of the heat sink (s).
  • the ventilations can be baffles integrated into the radiator or holes on which filters or membranes are fixed by gluing.
  • the ventilations are located below the radiator.
  • the figure 1 is a schematic sectional view of a lighting and / or signaling device according to the invention.
  • the figure 2 is a view identical to the figure 1 representing an alternative embodiment.
  • the figure 3 is a view identical to the figure 1 representing an alternative embodiment.
  • figure 4 is a view similar to figure 1 representing an alternative embodiment.
  • FIG. 1 there is shown a lighting and / or signaling device 1 according to the invention which is intended to equip a motor vehicle, for the projection of a light beam on the road taken by the vehicle.
  • This lighting and / or signaling device 1, called device 1 in the remainder of the description, comprises a housing 2 and a transparent element 3 delimiting with the housing 2 an enclosure 4.
  • the housing 2 is for example made of plastic material and has five walls: four side walls 5 interconnected to form an internal volume 7 and a bottom 6 located at one end of the side walls 5 and closing on one side the internal volume 7. Of the four side walls 5, only one side wall lower 5 'and an upper side wall 5 "are shown.
  • the upper 5" and lower 5' side walls extend in planes parallel to each other and substantially horizontal while the bottom 6 extends in a substantially vertical plane, c 'that is to say in a plane perpendicular to the planes in which extend the lower 5' and upper 5 "side walls.
  • the transparent element 3 is located at an end opposite the bottom 6 with respect to the side walls.
  • the transparent element 3 is, in particular, a mirror 3 '. It thus closes the internal volume 7 and forms, with the four side walls 5 and the bottom 6 of the housing 2, the enclosure 4.
  • the device further comprises a light source 8 and at least one radiator 9 in thermal and physical contact with the source 8.
  • the source light 8 and the radiator is located inside the enclosure 4, that is to say in the internal volume 7.
  • the light source 8 comprises one or more light-emitting diodes, also called LED 8 '. These LEDs 8 ′ are supplied by a control device 33 on which electronic components are located.
  • the control device 33 is, for example, a printed circuit board comprising electronic components.
  • the device 1 comprises at least one heat sink, called the first sink 14, which performs a heat exchange between an air contained in the enclosure 4, called interior air, and a flow of air outside the enclosure. 4, represented by arrow 30.
  • the heat sink 9 and the first heat sink 14 are two separate parts.
  • the radiator 9 and the first dissipator 14 are thus separated by the interior air present in the enclosure.
  • the radiator heats the interior air present in the enclosure 4 while the first dissipator 14 cools it.
  • a natural convection phenomenon is created between the radiator 9 which represents a hot surface and the first heat sink 14 which represents a cold surface.
  • the interior air is thus caused to move in the enclosure of the radiator 9 towards the first heat sink 14 to return to the radiator 9.
  • An interior air flow represented by the arrow 28 is thus created inside the enclosure. 4, that is to say in the internal volume 7. This air flow performs, in particular, a circulation loop between the radiator 9 and the first dissipator 14.
  • this first heat sink 14 comprises a first series of fins 15, a second series of fins 16 and a base 17 interposed between the first series 15 and the second series 16.
  • the first series of fins 15 extends into a surrounding volume where the flow of outside air circulates and the second series of fins 16 extends into the internal volume 7 delimited by the enclosure 4.
  • the base 17 is, for example, produced by a flat metal sheet or by a radiator, in particular a molded radiator. It is in contact, on the side of the first series of fins 15 with the surrounding volume in which the external air flow circulates and on the side of the second series of fins 16 with the internal volume 7.
  • the base 17 can be attached, for example by screwing onto the housing 2.
  • part of the base 17, in particular a peripheral part of the base 17, is molded onto the housing 2. That the base 17 is attached or overmolded, the housing 2 has an opening in which the base 17 is positioned, the base 17 being in all cases secured to the housing 2.
  • the sealing of the housing 2 at the level where the base 17 is located is provided by at least one seal (not shown) or by the cooperation of the surfaces in contact between the base 17 and the housing 2.
  • the first dissipator 14 is produced in a unitary fashion, that is to say that its first series of fins 15, its second series of fins 16 and its base 17 are made from the same material, in particular metallic so that they are in thermal contact.
  • the first series of fins 15 is cooled by the flow of outside air and in turn cools the base 17 and the second series of fins 16 in contact with the inside air.
  • the first heatsink may not have a series of fins if the heat to be dissipated from the LEDs 8 ′ does not justify it. It is also possible to adapt the number of fins in each series according to the heat to be dissipated. The greater the heat to be dissipated, the more fins there are on the outside, i.e. the more individual fins the first set of fins 15 comprises.
  • the radiator 9 has a part 11 for capturing a heat given off by the LEDs 8 'via the control device 33 and a dispersion part 12, the role of which is to disperse, in other words to remove, this heat.
  • the radiator 9 includes also a body 10 connecting the capture part 11 and the dispersion part 12. This body 10 extends, in particular, horizontally, that is to say parallel to the lower side walls 5 ′ and upper 5 ′′.
  • the capture part 11 comprises thermal connections 11 ', thermally connecting the control device 33 of the LED 8' to the body 10 of the radiator 9. These thermal connections 11 'are, in particular, arms which extend transversely to the body 10. of the radiator 9 and which connect it thermally and physically to the control device 33.
  • the control device 33 extends, for example, in a plane parallel to the plane in which the body 10 extends, that is to say in a horizontal plane.
  • the light source 8 is located, in particular, on the control device 33 which then extends from the light source towards the bottom 6 of the housing 2.
  • the thermal connections 11 ', transverse to the body 10 and to the control device 33 s' thus extend in part between the light source 8 and the bottom 6.
  • the dispersion part 12 is located in the internal volume 7 delimited by the enclosure 4 at a distance from the glass 3 'of between 5 mm and 50 mm.
  • This dispersion part 12 comprises, in particular, fins 13 to improve the heat exchange with the interior air contained in the enclosure 4. These fins 13 extend transversely to the body 10 of the radiator 9 and are located close to the mirror. 3 'so as to bring as much heat as possible near the 3' mirror to limit condensation on the 3 'mirror.
  • the fins 13 can, in particular, be oriented vertically in order to direct the internal air flow and thus increase the cooling efficiency of the LEDs 8 'while further limiting the condensation on the glass 3', on the part a larger volume of heated air close to the ice 3 '.
  • the radiator 9 is made in one piece, that is to say that the body 10, the capture part 11 and the dispersion part 12 are made from the same material, for example, by molding 'a conductive material. It is, for example, Aluminum or an aluminum alloy.
  • the first heat sink 14 is positioned above the heat sink 9 at the level of the upper side wall 5 ". It is located, in particular, in the extension of the heat sink 9 along an axis 29 parallel to the plane in which the transparent element extends. In other words, the axis 29 intersects both the radiator 9 and the first heat sink 14.
  • the first heat sink 14 is located in the extension of the heat sink 9 along an axis 36 perpendicular to the upper side wall 5 ", the 'axis 36 being vertical and intersecting both the heat sink 9 and the first heat sink 14.
  • the interior air thus rises while heating in contact with the radiator 9 and then descends again rapidly after having been cooled in contact with the first dissipator 14, thus creating a phenomenon of natural convection inside the enclosure 4.
  • the interior air produces thus circulation loops and the term internal air flow, represented by arrow 28, is the air flow effecting these loops.
  • Another advantage comes from the fact that by increasing the speed of circulation of the internal air flow, the speed of rise of hot air in front of the transparent element 3 is increased, which ensures better demisting of the transparent element 3.
  • the device further comprises a first duct 18 disposed above the enclosure 4 and capable of guiding the flow of outside air towards the first dissipator 14.
  • the first duct 18 is thus disposed on the upper side wall 5 "so that at least part of the base 17 and the first series of fins 15 are located in the first duct 18.
  • the first duct 18 channels the flow of outside air which can rush into it and cool the air.
  • the flow of outside air can then leave the first duct 18 via a first discharge means 19 which the first duct comprises 18.
  • This first evacuation means 19 is, in particular, an evacuation orifice or, for example, a grid 19 '. This ensures renewal of the external air flow to improve the cooling of the first heat sink 14.
  • the figure 2 illustrates a variant of the invention according to which the device 1 comprises a second heat sink 20.
  • This second heat sink 20 is located, in particular, below the heat sink 9 and performs a heat exchange between the air contained in the enclosure 4 and the external air flow 30.
  • Such a second dissipator 20 is used in the case where the power to be dissipated and therefore the heat to be dissipated are greater.
  • This second heat sink 20 is separate from the first heat sink 14 and from the heat sink 9.
  • the second heat sink 20 is located, in particular, below the heat sink 9, at the level of the lower side wall 5 'so that it helps to promote the loop of indoor air circulation.
  • the second heatsink 20 comprises, like the first heatsink 14, a first series of fins 21, a second series of fins 22 and a base 23 interposed between the first series 21 and the second series 22.
  • the base 23 is integral. of the housing 2, for example, at the level of the lower side wall 5 '.
  • the first series of fins 21 thus extends into the surrounding volume where the flow of external air circulates and the second series of fins 22 extends into the internal volume delimited by the enclosure 4.
  • the first series of fins fins 21, the second series of fins 22 and the base 23 of the second heat sink 20 have the same characteristics as the first series of fins 15, the second series of fins 16 and the base 17 of the first heat sink 14.
  • the second dissipator 20 is produced in a unitary fashion, that is to say that its first series of fins 21, its second series of fins 22 and its base 23 are made from the same material, in particular metallic so that they are in thermal contact.
  • the first series of fins 21 is cooled by the flow of outside air and in turn cools the base 23 and the second series of fins 22 in contact with the inside air.
  • the device 1 comprises a second duct 24 disposed below the enclosure 4 and capable of guiding the flow of outside air towards the second dissipator 20 of the same way as explained above for the first duct 18.
  • the second duct 24 is thus arranged on the lower side wall 5 'so that at least part of the base 23 and the first series of fins 21 are located in the second duct 24.
  • the flow of outside air rushes into the second duct 24 and can cool the second heat sink 20 via the first series of fins 21.
  • the flow of outside air can then exit of the second conduit 24 by a second discharge means 32 which the second conduit 24 comprises.
  • This second discharge means 32 is, in particular, an discharge orifice or, for example, a grid 32 '. This ensures renewal of the external air flow to improve the cooling of the second heat sink 14.
  • the presence of the first dissipator 14 and of the second dissipator 20 thus makes it possible to increase the exchange capacity with the exterior and therefore to reduce the size and the mass of the radiator 9.
  • the figure 2 also makes it possible to illustrate a variant of the invention according to which a thermal conduction means 25 is positioned between the radiator 9 and the second dissipator 20.
  • the thermal conduction means 25 is a metal part making it possible to transfer heat from the heat sink. heat sink 9 to the second heat sink 20 to facilitate cooling of the heat sink 9.
  • the thermal conduction means 25 makes it possible to increase the capacity of the heat sink 9 to dissipate the heat given off by the control device 33 of the LEDs 8 'and therefore to reduce the on-board mass of the radiator 9.
  • the thermal conduction means 25 is a drain which conducts the calories coming from the radiator directly to the second dissipator.
  • a portion 26 of the heat sink (s) 14, 20 extends at a distance from the glass of less than 50 mm.
  • the first heat sink 14, the heat sink 9 and the second heat sink 20 are cut by the axis 29 parallel to the plane in which the transparent element 3 extends and by the axis 36 perpendicular to the upper side wall 5 ".
  • the figure 3 illustrates an alternative embodiment of the invention according to which the base 17, 23 of the dissipator (s) 14, 20, has ventilations 27 capable of circulate the flow of outside air inside the enclosure 4.
  • the ventilations 27 By placing the ventilations 27 on the base 17, 23 of the heat sink (s) 14, 20, one thus takes advantage of the opening in the housing generated by these to install the heatsinks. In this way, an additional hole is avoided to ensure ventilation of the internal volume 7.
  • the arrow 31 represents the circulation of the external air flow entered by means of the ventilations 27 inside the interior volume 7.
  • the ventilations 27 are thus located below the radiator 9. These ventilations 27 make it possible to increase the circulation. air inside the enclosure 4 by allowing the introduction of the outside air flow present in the second duct 24 to penetrate inside the volume 7.
  • These ventilations 27 are, in particular, membranes welded to the housing 2 or on the ice 3 'or baffles with filter.
  • the figure 4 illustrates an alternative embodiment which is not covered by claim 1 and according to which the control device 33 is placed directly on the radiator, on a zone close to the window 3 ', that is to say a zone situated within 50 mm of the 3 'ice.
  • the device 1 also comprises the first heat sink 14 and the heat sink 9 but the latter does not have a dispersion part 12 since the heat is directly released by the control device 33 in an area close to the glass 3 '.
  • the control device 33 thus makes it possible to bring heat close to the ice 3 'and to obtain the demisting of the ice 3'.
  • the radiator 9 comprises the collection zone 11 provided with the thermal connections 11 '.
  • the figure 4 also makes it possible to illustrate a mask 34 which the device 1 comprises and which extends between the light source 8 and the control device 33, the mask covering the latter. Its purpose is, in particular, to hide the constituent elements of the device 1 such as for example the radiator 9 and the control device 33, so that they are not visible from the outside through the transparent element 3.
  • the mask 34 could also be connected directly from the light source 8 to the radiator 9.
  • control device 33 is placed on the dispersion part 12, near the ice 3 '.
  • the control device 33 is here located in the internal volume at a distance from the glass 3 'of between 5 mm and 50 mm. In this way, the heat given off by the control device 33 is used to create convective air flows as close as possible to the ice 3 'in order to ensure the demisting of the condensation that may be created on an internal face of the ice. transparent element 3.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Description

La présente invention concerne un dispositif d'éclairage et/ou de signalisation pour véhicule et relève plus particulièrement des éléments ayant pour mission de dissiper une chaleur issue d'une source de lumière que comprend le dispositif.The present invention relates to a lighting and / or signaling device for a vehicle and more particularly relates to elements whose mission is to dissipate heat originating from a light source that the device comprises.

Les dispositifs d'éclairage et/ou de signalisation pour véhicule sont principalement constitués d'une source lumineuse, d'un boîtier et d'un élément transparent à travers lequel la lumière issue de la source lumineuse est projetée, l'élément transparent délimitant avec le boîtier une enceinte.Lighting and / or signaling devices for vehicles mainly consist of a light source, a housing and a transparent element through which the light from the light source is projected, the transparent element delimiting with the housing an enclosure.

Pour des questions de luminance et de style, il convient d'utiliser une ou plusieurs diodes électroluminescentes d'éclairage, appelées LED. Pour assurer une luminance suffisante sur la route, les puissances dissipées par les LED sont de l'ordre de 10 Watt.For questions of luminance and style, one or more light-emitting diodes, called LEDs, should be used. To ensure sufficient luminance on the road, the powers dissipated by the LEDs are of the order of 10 Watt.

De la chaleur est ainsi dégagée de la source lumineuse et si elle n'est pas dissipée, elle peut engendrer une déformation du boîtier ou de l'élément transparent ou encore engendrer un abaissement de la qualité d'un flux lumineux émis par les LED.Heat is thus released from the light source and if it is not dissipated, it can cause deformation of the housing or of the transparent element or even lower the quality of a light flux emitted by the LEDs.

Il est connu, pour faire face à ces inconvénients, de dissiper une partie de la chaleur dégagée par la source lumineuse en fournissant au dispositif d'éclairage et/ou de signalisation un système de refroidissement proposant soit une convection naturelle, soit une convection forcée. Or les systèmes de refroidissement proposant une convection naturelle sont lourds et encombrants alors que les systèmes de refroidissement proposant une convection forcée utilisent des ventilateurs qui posent un problème de coût, de bruit, de poussière et de fiabilité.It is known, in order to face these drawbacks, to dissipate part of the heat given off by the light source by supplying the lighting and / or signaling device with a cooling system offering either natural convection or forced convection. However, cooling systems offering natural convection are heavy and bulky, while cooling systems offering forced convection use fans which pose a problem of cost, noise, dust and reliability.

Un dispositif d'éclairage et/ou de signalisation comprenant les caractéristiques du préambule de la revendication 1 est par exemple connu du document US2007/0008727A1 .A lighting and / or signaling device comprising the characteristics of the preamble of claim 1 is for example known from the document US2007 / 0008727A1 .

Le but de la présente invention est donc de résoudre les inconvénients décrits ci-dessus principalement en proposant une solution technique pour optimiser et améliorer l'efficacité du refroidissement en convection naturel et réduire la masse des radiateurs embarqués sur les dispositifs d'éclairage et/ou de signalisation équipés d'une telle solution.The aim of the present invention is therefore to resolve the drawbacks described above mainly by proposing a technical solution for optimizing and improving the efficiency of cooling in natural convection and reducing the mass of the radiators on board the lighting devices and / or signaling devices equipped with such a solution.

L'invention propose à cet effet un dispositif d'éclairage et/ou de signalisation comprenant un boîtier, un élément transparent délimitant avec le boîtier une enceinte, une source de lumière et au moins un radiateur en contact thermique avec ladite source. Selon l'invention, le radiateur s'étend dans l'enceinte et le dispositif comprend au moins un dissipateur thermique, appelé premier dissipateur, qui réalise un échange thermique entre un air contenu dans l'enceinte et un flux d'air extérieur à l'enceinte. Selon l'invention, le radiateur possède une partie de captage d'une chaleur dégagée par ladite source et une partie avancée de dispersion de ladite chaleur. On comprend par « avancée » le fait que ladite partie de dispersion est située dans le volume interne à une distance de l'élément transparent comprise entre 5 mm et 50 mm. De cette manière, le radiateur amène un maximum de chaleur à proximité de la glace afin, notamment, de limiter les phénomènes de condensation sur la glace. Cela permet également d'améliorer la dissipation de la chaleur au niveau de la partie de dispersion car celle-ci est située à proximité de l'élément transparent, la face externe de ce dernier étant directement en contact avec le flux d'air extérieur.The invention provides for this purpose a lighting and / or signaling device comprising a housing, a transparent element defining with the housing an enclosure, a light source and at least one radiator in thermal contact with said source. According to the invention, the radiator extends into the enclosure and the device comprises at least one heat sink, called the first dissipator, which performs a heat exchange between an air contained in the enclosure and a flow of air outside the enclosure. 'pregnant. According to the invention, the radiator has a part for capturing a heat given off by said source and an advanced part for dispersing said heat. The term “advanced” is understood to mean the fact that said dispersion part is located in the internal volume at a distance from the transparent element of between 5 mm and 50 mm. In this way, the radiator brings a maximum of heat close to the glass in order, in particular, to limit the phenomena of condensation on the glass. This also makes it possible to improve the dissipation of heat at the level of the dispersion part because the latter is located near the transparent element, the external face of the latter being directly in contact with the flow of outside air.

Le premier dissipateur représente ainsi une surface froide refroidie par le flux d'air extérieur et qui permet à l'air se trouvant à l'intérieur de l'enceinte de se refroidir. L'air se trouvant à l'intérieur de l'enceinte circule ainsi du radiateur vers le premier dissipateur avant de revenir vers le radiateur, en effectuant une boucle de circulation, créant ainsi un phénomène de convection naturelle à l'intérieur de l'enceinte favorisant le refroidissement de l'air se trouvant à l'intérieur de l'enceinte.The first dissipator thus represents a cold surface cooled by the flow of outside air and which allows the air located inside the enclosure to cool. The air inside the enclosure thus circulates from the radiator to the first heat sink before returning to the radiator, carrying out a circulation loop, thus creating a phenomenon of natural convection inside the enclosure. promoting the cooling of the air inside the enclosure.

Selon un aspect de l'invention, le radiateur et le premier dissipateur sont distincts.According to one aspect of the invention, the heat sink and the first heat sink are separate.

Selon un autre aspect de l'invention, le premier dissipateur comprend une première série d'ailettes, une deuxième série d'ailettes et une embase interposée entre la première série et la deuxième série, ladite embase étant solidaire du boîtier alors que la première série d'ailettes s'étend dans un volume environnant où circule le flux d'air extérieur, la deuxième série d'ailettes s'étend dans un volume délimité par l'enceinte, dit volume interne. On comprend ici, que les ailettes du premier dissipateur sont reliées thermiquement à l'embase et optimisent l'échange thermique entre l'air chaud présent à l'intérieur du boîtier et l'air froid présent à l'extérieur du boîtier.According to another aspect of the invention, the first heatsink comprises a first series of fins, a second series of fins and a base interposed between the first series and the second series, said base being integral with the housing while the first series of fins extends into a surrounding volume where the flow of external air circulates, the second series of fins extends into a volume delimited by the enclosure, called the internal volume. It is understood here that the fins of the first heat sink are thermally connected to the base and optimize the heat exchange between the hot air present inside the case and the cold air present outside the case.

Selon un exemple de réalisation de l'invention, le premier dissipateur est situé au dessus du radiateur. De cette façon, un flux d'air intérieur à l'enceinte va être créé, l'air chaud à proximité du radiateur montant vers la source froide que représente le premier dissipateur, puis redescend une fois refroidi vers le radiateur en effectuant ainsi une boucle de circulation.According to an exemplary embodiment of the invention, the first heat sink is located above the heat sink. In this way, a flow of air inside the enclosure will be created, the hot air near the radiator rising towards the cold source represented by the first dissipator, then descending once cooled towards the radiator, thus making a loop. traffic.

Avantageusement, le premier dissipateur est situé dans le prolongement du radiateur. Autrement dit, au moins un axe perpendiculaire à une paroi latérale du boîtier sur laquelle se situe le premier dissipateur coupe à la fois le radiateur et le premier dissipateur. De manière complémentaire, au moins un axe parallèle à l'élément transparent coupe à la fois le radiateur et le premier dissipateur. On garantit de cette façon que la chaleur générée par le radiateur monte et se trouve immédiatement au contact du premier dissipateur. On crée de la sorte un gradient de température proche de la glace entre la surface chaude (radiateur) et la surface froide (premier dissipateur) de sorte qu'on accélère la vitesse du flux d'air circulant à l'intérieur de l'enceinte, améliorant ainsi la convection naturelle et le désembuage de la glace.Advantageously, the first heat sink is located in the extension of the heat sink. In other words, at least one axis perpendicular to a side wall of the case on which the first heat sink is located intersects both the heat sink and the first heat sink. In a complementary manner, at least one axis parallel to the transparent element intersects both the heat sink and the first heat sink. This ensures that the heat generated by the heat sink rises and is immediately in contact with the first heat sink. In this way, a temperature gradient close to ice is created between the hot surface (radiator) and the cold surface (first dissipator) so that the speed of the air flow circulating inside the enclosure is accelerated. , thus improving the natural convection and demisting of the ice.

Selon un aspect de l'invention, ledit dispositif comprend un premier conduit disposé au dessus de l'enceinte et apte à guider le flux d'air extérieur vers le premier dissipateur, le premier conduit comprenant un premier moyen d'évacuation permettant au flux d'air extérieur de sortir du premier conduit. Le premier moyen d'évacuation est, notamment, une grille et permet ainsi au flux d'air extérieur de se renouveler et de rester à une température permettant le refroidissement du premier dissipateur.According to one aspect of the invention, said device comprises a first duct arranged above the enclosure and capable of guiding the flow of outside air towards the first dissipator, the first duct comprising a first exhaust means allowing the flow of air. outside air to come out of the first duct. The first discharge means is, in particular, a grid and thus allows the flow of outside air to be renewed and to remain at a temperature allowing the cooling of the first heat sink.

Selon un autre aspect de l'invention, ledit dispositif comprend un deuxième dissipateur thermique situé en dessous du radiateur et qui réalise un échange thermique entre l'air contenu dans l'enceinte et le flux d'air extérieur. De manière avantageuse le deuxième dispositif est distinct du radiateur et du premier dissipateur. La présence du deuxième dissipateur, en plus du premier dissipateur, peut ainsi augmenter la capacité de refroidissement de l'air contenu à l'intérieur de l'enceinte.According to another aspect of the invention, said device comprises a second heat sink located below the heat sink and which performs an exchange thermal between the air contained in the enclosure and the flow of outside air. Advantageously, the second device is separate from the radiator and from the first dissipator. The presence of the second heat sink, in addition to the first heat sink, can thus increase the cooling capacity of the air contained inside the enclosure.

Selon un exemple de réalisation de l'invention, le deuxième dissipateur comprend un première série d'ailettes, une deuxième série d'ailettes et une embase interposée entre la première série et la deuxième série, ladite embase étant solidaire du boîtier alors que la première série d'ailettes s'étend dans un volume environnant où circule le flux d'air extérieur, la deuxième série d'ailettes s'étend dans un volume délimité par l'enceinte. On comprend ici, que les ailettes du deuxième dissipateur sont reliées thermiquement à l'embase et optimisent l'échange thermique entre l'air chaud présent à l'intérieur du boîtier et l'air froid présent à l'extérieur du boîtier.According to an exemplary embodiment of the invention, the second heat sink comprises a first series of fins, a second series of fins and a base interposed between the first series and the second series, said base being integral with the housing while the first series of fins extends in a surrounding volume where the flow of outside air circulates, the second series of fins extends in a volume delimited by the enclosure. It will be understood here that the fins of the second heat sink are thermally connected to the base and optimize the heat exchange between the hot air present inside the case and the cold air present outside the case.

De manière avantageuse, ledit dispositif comprend un deuxième conduit disposé en dessous de l'enceinte et apte à guider le flux d'air extérieur vers le deuxième dissipateur, et dans lequel le deuxième conduit comprend un deuxième moyen d'évacuation permettant au flux d'air de sortir du deuxième conduit. Le deuxième moyen d'évacuation est, notamment, une grille et permet ainsi au flux d'air extérieur de se renouveler et de rester à une température permettant le refroidissement du premier dissipateur.Advantageously, said device comprises a second duct disposed below the enclosure and capable of guiding the flow of outside air towards the second dissipator, and in which the second duct comprises a second discharge means allowing the flow of air to come out of the second duct. The second discharge means is, in particular, a grid and thus allows the flow of outside air to be renewed and to remain at a temperature allowing the cooling of the first dissipator.

Selon un aspect de l'invention, un moyen de conduction thermique est relié d'un coté au radiateur et de l'autre coté au deuxième dissipateur. Le moyen de conduction thermique peut ainsi améliorer l'échange thermique entre le radiateur et le deuxième dissipateur. Le moyen de conduction thermique est, notamment, un caloduc ou, par exemple, un feuillard thermiquement conducteur.According to one aspect of the invention, a thermal conduction means is connected on one side to the heat sink and on the other side to the second heat sink. The thermal conduction means can thus improve the heat exchange between the heat sink and the second heat sink. The thermal conduction means is, in particular, a heat pipe or, for example, a thermally conductive strip.

Selon un exemple de réalisation de l'invention, une portion du ou des dissipateurs s'étend à une distance de l'élément transparent inférieure à 50 mm.According to an exemplary embodiment of the invention, a portion of the heat sink (s) extends at a distance from the transparent element of less than 50 mm.

Avantageusement, une partie de l'embase du ou des dissipateurs est surmoulée dans le boîtier. Autrement dit, une partie de l'embase du ou des dissipateurs, notamment une partie périphérique de l'embase du ou des dissipateurs, est recouverte d'une matière constituant le boîtier, ou avantageusement noyée dans cette matière.Advantageously, part of the base of the heat sink (s) is molded into the housing. In other words, part of the base of the heat sink (s), in particular a peripheral part of the base of the heat sink (s), is covered with a material constituting the housing, or advantageously embedded in this material.

De manière alternative au mode de réalisation décrit dans le paragraphe précédent, l'embase du ou des dissipateurs est rapportée au boîtier. Dans ce cas, le boîtier comprend une ouverture de réception du ou des dissipateurs, ces derniers comprenant un moyen de fixation au boîtier, par exemple, des trous aptes à recevoir un élément de fixation, notamment, des vis.As an alternative to the embodiment described in the previous paragraph, the base of the heat sink (s) is attached to the housing. In this case, the case comprises an opening for receiving the heat sink (s), the latter comprising a means for fixing to the case, for example, holes suitable for receiving a fixing element, in particular screws.

Selon un aspect de l'invention, l'embase du ou des dissipateurs possède des ventilations aptes à faire circuler le flux d'air extérieur à l'intérieur de l'enceinte. Autrement dit, l'embase du ou des dissipateurs possède des ouvertures permettant une entrée dans l'enceinte du flux d'air extérieur. De cette manière, on exploite la zone du boîtier où se situe le ou les dissipateurs pour placer les ventilations. Ces ventilations permettent de refroidir d'avantage l'air contenu dans l'enceinte, en autorisant le flux d'air extérieur à pénétrer à l'intérieur de l'enceinte. Le boîtier peut également comprendre de telles ventilations, notamment à proximité de l'embase du ou des dissipateurs. Les ventilations peuvent être des chicanes intégrés au radiateur ou des trous sur lesquelles des filtres ou membranes sont fixés par collage.According to one aspect of the invention, the base of the heat sink (s) has ventilations capable of circulating the flow of outside air inside the enclosure. In other words, the base of the heat sink (s) has openings allowing entry into the enclosure of the external air flow. In this way, the area of the case where the heat sink (s) is located is used to place the ventilations. These ventilations make it possible to further cool the air contained in the enclosure, by allowing the flow of outside air to penetrate inside the enclosure. The housing may also include such ventilations, in particular near the base of the heat sink (s). The ventilations can be baffles integrated into the radiator or holes on which filters or membranes are fixed by gluing.

Selon un exemple de réalisation de l'invention, les ventilations sont situées en dessous du radiateur.According to an exemplary embodiment of the invention, the ventilations are located below the radiator.

Ainsi grâce à l'invention, et à la présence du ou des dissipateurs, du moyen de conduction thermique et/ou des ventilations, il est possible d'augmenter la capacité d'échange thermique de l'air intérieur avec l'air extérieur. On augmente ainsi la capacité de dissipation de la chaleur émise par la source lumineuse et il est alors possible de réduire la taille et la masse du radiateur présent à l'intérieur de l'enceinte.Thus, thanks to the invention, and to the presence of the heat sink (s), of the thermal conduction means and / or of the ventilations, it is possible to increase the heat exchange capacity of the inside air with the outside air. This increases the capacity for dissipating the heat emitted by the light source and it is then possible to reduce the size and the mass of the radiator present inside the enclosure.

Les figures annexées feront bien comprendre comment l'invention peut être réalisée. Sur ces figures, des références identiques désignent des éléments semblables.The appended figures will make it easy to understand how the invention can be implemented. In these figures, identical references designate similar elements.

La figure 1 est une vue schématique en coupe d'un dispositif d'éclairage et/ou de signalisation selon l'invention.The figure 1 is a schematic sectional view of a lighting and / or signaling device according to the invention.

La figure 2 est une vue identique à la figure 1 représentant une variante de réalisation.The figure 2 is a view identical to the figure 1 representing an alternative embodiment.

La figure 3 est une vue identique à la figure 1 représentant une variante de réalisation.The figure 3 is a view identical to the figure 1 representing an alternative embodiment.

La figure 4 est une vue similaire à la figure 1 représentant une variante de réalisation.The figure 4 is a view similar to figure 1 representing an alternative embodiment.

Sur la figure 1, est représenté un dispositif d'éclairage et/ou de signalisation 1 selon l'invention qui est destiné à équiper un véhicule automobile, pour la projection d'un faisceau lumineux sur la route emprunté par le véhicule. Ce dispositif d'éclairage et/ou de signalisation 1, appelé dispositif 1 dans la suite de la description, comprend un boîtier 2 et un élément transparent 3 délimitant avec le boîtier 2 une enceinte 4. Le boîtier 2 est par exemple en matériau plastique et possède cinq parois : quatre parois latérales 5 reliées entre elle pour former un volume interne 7 et un fond 6 situé à une extrémité des parois latérales 5 et fermant d'un coté le volume interne 7. Parmi les quatre parois latérales 5 seules une paroi latérale inférieure 5' et une paroi latérale supérieure 5" sont représentées. Les parois latérales supérieure 5" et inférieure 5' s'étendent dans des plans parallèles entre eux et sensiblement horizontaux alors que le fond 6 s'étend dans un plan sensiblement verticale, c'est-à-dire dans un plan perpendiculaire aux plans dans lesquels s'étendent les parois latérales inférieure 5' et supérieure 5".On the figure 1 , there is shown a lighting and / or signaling device 1 according to the invention which is intended to equip a motor vehicle, for the projection of a light beam on the road taken by the vehicle. This lighting and / or signaling device 1, called device 1 in the remainder of the description, comprises a housing 2 and a transparent element 3 delimiting with the housing 2 an enclosure 4. The housing 2 is for example made of plastic material and has five walls: four side walls 5 interconnected to form an internal volume 7 and a bottom 6 located at one end of the side walls 5 and closing on one side the internal volume 7. Of the four side walls 5, only one side wall lower 5 'and an upper side wall 5 "are shown. The upper 5" and lower 5' side walls extend in planes parallel to each other and substantially horizontal while the bottom 6 extends in a substantially vertical plane, c 'that is to say in a plane perpendicular to the planes in which extend the lower 5' and upper 5 "side walls.

L'élément transparent 3 est situé à une extrémité opposée au fond 6 par rapport aux parois latérales. L'élément transparent 3 est, notamment, une glace 3'. Il ferme ainsi le volume interne 7 et forme avec les quatre parois latérales 5 et le fond 6 du boîtier 2, l'enceinte 4.The transparent element 3 is located at an end opposite the bottom 6 with respect to the side walls. The transparent element 3 is, in particular, a mirror 3 '. It thus closes the internal volume 7 and forms, with the four side walls 5 and the bottom 6 of the housing 2, the enclosure 4.

Le dispositif comprend en outre une source de lumière 8 et au moins un radiateur 9 en contact thermiquement et physiquement avec la source 8. La source de lumière 8 et le radiateur se situe à l'intérieur de l'enceinte 4, c'est-à-dire dans le volume interne 7.The device further comprises a light source 8 and at least one radiator 9 in thermal and physical contact with the source 8. The source light 8 and the radiator is located inside the enclosure 4, that is to say in the internal volume 7.

La source lumineuse 8 comprend une ou plusieurs diodes électroluminescentes, également appelées LED 8'. Ces LED 8' sont alimentées par un dispositif de commande 33 sur lequel se situent des composants électroniques. Le dispositif de commande 33 est, par exemple, une carte de circuit imprimé comprenant des composants électroniques. Lorsque les LED 8' fonctionnent, les composants électroniques chauffent et c'est le rôle du radiateur 9, s'étendant dans l'enceinte 4, de dissiper en partie une chaleur créée par ces composants.The light source 8 comprises one or more light-emitting diodes, also called LED 8 '. These LEDs 8 ′ are supplied by a control device 33 on which electronic components are located. The control device 33 is, for example, a printed circuit board comprising electronic components. When the LEDs 8 ′ operate, the electronic components heat up and it is the role of the radiator 9, extending into the enclosure 4, to partially dissipate a heat created by these components.

Selon l'invention, le dispositif 1 comprend au moins un dissipateur thermique, appelé premier dissipateur 14, qui réalise un échange thermique entre un air contenu dans l'enceinte 4, appelé air intérieur, et un flux d'air extérieur à l'enceinte 4, représenté par la flèche 30.According to the invention, the device 1 comprises at least one heat sink, called the first sink 14, which performs a heat exchange between an air contained in the enclosure 4, called interior air, and a flow of air outside the enclosure. 4, represented by arrow 30.

Comme représenté sur la figure 1, le radiateur 9 et le premier dissipateur 14 sont deux pièces distincts. Le radiateur 9 et le premier dissipateur 14 sont ainsi séparés par l'air intérieur présent dans l'enceinte. Le radiateur chauffe l'air intérieur présent dans l'enceinte 4 alors que le premier dissipateur 14 le refroidit. Ainsi, un phénomène de convection naturelle est créé entre le radiateur 9 qui représente une surface chaude et le premier dissipateur 14 qui représente une surface froide. L'air intérieur est ainsi amené à se déplacer dans l'enceinte du radiateur 9 vers le premier dissipateur 14 pour revenir au radiateur 9. Un flux d'air intérieur représenté par la flèche 28 est ainsi créé à l'intérieur de l'enceinte 4, c'est-à-dire dans le volume interne 7. Ce flux d'air effectue, notamment, une boucle de circulation entre le radiateur 9 et le premier dissipateur 14.As shown on figure 1 , the heat sink 9 and the first heat sink 14 are two separate parts. The radiator 9 and the first dissipator 14 are thus separated by the interior air present in the enclosure. The radiator heats the interior air present in the enclosure 4 while the first dissipator 14 cools it. Thus, a natural convection phenomenon is created between the radiator 9 which represents a hot surface and the first heat sink 14 which represents a cold surface. The interior air is thus caused to move in the enclosure of the radiator 9 towards the first heat sink 14 to return to the radiator 9. An interior air flow represented by the arrow 28 is thus created inside the enclosure. 4, that is to say in the internal volume 7. This air flow performs, in particular, a circulation loop between the radiator 9 and the first dissipator 14.

La figure 1 permet également de représenter des caractéristiques du premier dissipateur 14. En effet, ce premier dissipateur 14 comprend une première série d'ailettes 15, une deuxième série d'ailettes 16 et une embase 17 interposée entre la première série 15 et la deuxième série 16.The figure 1 It also makes it possible to represent the characteristics of the first heat sink 14. In fact, this first heat sink 14 comprises a first series of fins 15, a second series of fins 16 and a base 17 interposed between the first series 15 and the second series 16.

La première série d'ailettes 15 s'étend dans un volume environnant où circule le flux d'air extérieur et la deuxième série d'ailettes 16 s'étend dans le volume interne 7 délimité par l'enceinte 4.The first series of fins 15 extends into a surrounding volume where the flow of outside air circulates and the second series of fins 16 extends into the internal volume 7 delimited by the enclosure 4.

L'embase 17 est, par exemple, réalisée par une tôle métallique plane ou par un radiateur, notamment, un radiateur moulé. Elle est en contact, du coté de la première série d'ailettes 15 avec le volume environnant dans lequel circule le flux d'air extérieur et du coté de la deuxième série d'ailettes 16 avec le volume interne 7. L'embase 17 peut être rapportée, par exemple par vissage sur le boîtier 2. Dans un autre mode de réalisation, une partie de l'embase 17, notamment, une partie périphérique de l'embase 17, est surmoulée au boîtier 2. Que l'embase 17 soit rapportée ou surmoulée, le boîtier 2 possède une ouverture, dans laquelle l'embase 17 est positionnée, l'embase 17 étant dans tous les cas solidaire du boîtier 2. L'étanchéité du boîtier 2 au niveau où se situe l'embase 17 est assurée grâce à au moins un joint (non représenté) ou grâce à la coopération des surfaces en contact entre l'embase 17 et le boîtier 2.The base 17 is, for example, produced by a flat metal sheet or by a radiator, in particular a molded radiator. It is in contact, on the side of the first series of fins 15 with the surrounding volume in which the external air flow circulates and on the side of the second series of fins 16 with the internal volume 7. The base 17 can be attached, for example by screwing onto the housing 2. In another embodiment, part of the base 17, in particular a peripheral part of the base 17, is molded onto the housing 2. That the base 17 is attached or overmolded, the housing 2 has an opening in which the base 17 is positioned, the base 17 being in all cases secured to the housing 2. The sealing of the housing 2 at the level where the base 17 is located is provided by at least one seal (not shown) or by the cooperation of the surfaces in contact between the base 17 and the housing 2.

Le premier dissipateur 14 est réalisé de manière unitaire, c'est-à-dire que sa première série d'ailettes 15, sa deuxième série d'ailettes 16 et son embase 17 sont issues du même matériau, notamment, métallique de sorte qu'ils sont en contact thermique. Ainsi, la première série d'ailettes 15 est refroidie par le flux d'air extérieur et refroidit à son tour l'embase 17 et la deuxième série d'ailettes 16 en contact avec l'air intérieur.The first dissipator 14 is produced in a unitary fashion, that is to say that its first series of fins 15, its second series of fins 16 and its base 17 are made from the same material, in particular metallic so that they are in thermal contact. Thus, the first series of fins 15 is cooled by the flow of outside air and in turn cools the base 17 and the second series of fins 16 in contact with the inside air.

Il faut noter que le premier dissipateur peut être dépourvu de série d'ailettes si la chaleur à dissiper issue des LED 8' ne le justifie pas. Il est également possible d'adapter le nombre d'ailettes de chaque série en fonction de la chaleur à dissiper. Plus la chaleur à dissiper est importante, plus les ailettes à l'extérieur sont nombreuses, c'est-à-dire plus la première série d'ailettes 15 comprend d'ailettes individuelles.It should be noted that the first heatsink may not have a series of fins if the heat to be dissipated from the LEDs 8 ′ does not justify it. It is also possible to adapt the number of fins in each series according to the heat to be dissipated. The greater the heat to be dissipated, the more fins there are on the outside, i.e. the more individual fins the first set of fins 15 comprises.

Le radiateur 9 possède une partie de captage 11 d'une chaleur dégagée par les LED 8' via le dispositif de commande 33 et une partie de dispersion 12 dont le rôle est de disperser, autrement dit évacuer, cette chaleur. Le radiateur 9 comprend également un corps 10 reliant la partie de captage 11 et la partie de dispersion 12. Ce corps 10 s'étend, notamment, horizontalement, c'est-à-dire parallèlement aux parois latérale inférieure 5' et supérieure 5".The radiator 9 has a part 11 for capturing a heat given off by the LEDs 8 'via the control device 33 and a dispersion part 12, the role of which is to disperse, in other words to remove, this heat. The radiator 9 includes also a body 10 connecting the capture part 11 and the dispersion part 12. This body 10 extends, in particular, horizontally, that is to say parallel to the lower side walls 5 ′ and upper 5 ″.

La partie de captage 11 comprend des connexions thermique 11', reliant thermiquement le dispositif de commande 33 de la LED 8' au corps 10 du radiateur 9. Ces connexions thermiques 11' sont, notamment, des bras qui s'étendent transversalement au corps 10 du radiateur 9 et qui le relient thermiquement et physiquement au dispositif de commande 33. Le dispositif de commande 33 s'étend, par exemple, dans un plan parallèle au plan dans lequel s'étend le corps 10, c'est-à-dire dans un plan horizontal.The capture part 11 comprises thermal connections 11 ', thermally connecting the control device 33 of the LED 8' to the body 10 of the radiator 9. These thermal connections 11 'are, in particular, arms which extend transversely to the body 10. of the radiator 9 and which connect it thermally and physically to the control device 33. The control device 33 extends, for example, in a plane parallel to the plane in which the body 10 extends, that is to say in a horizontal plane.

La source lumineuse 8 est située, notamment, sur le dispositif de commande 33 qui s'étend alors depuis la source lumineuse vers le fond 6 du boîtier 2. Les connexions thermiques 11', transversale au corps 10 et au dispositif de commande 33 s'étendent ainsi en partie entre la source lumineuse 8 et le fond 6.The light source 8 is located, in particular, on the control device 33 which then extends from the light source towards the bottom 6 of the housing 2. The thermal connections 11 ', transverse to the body 10 and to the control device 33 s' thus extend in part between the light source 8 and the bottom 6.

La partie de dispersion 12 est située dans le volume interne 7 délimité par l'enceinte 4 à une distance de la glace 3' comprise entre 5 mm et 50 mm. Cette partie de dispersion 12 comprend, notamment, des ailettes 13 pour améliorer l'échange thermique avec l'air intérieur contenu dans l'enceinte 4. Ces ailettes 13 s'étendent transversalement au corps 10 du radiateur 9 et sont situées proche de la glace 3' de manière à ramener un maximum de chaleur à proximité de la glace 3' pour limiter la condensation sur la glace 3'. Les ailettes 13 peuvent, notamment, être orientées verticalement afin d'orienter le flux d'air intérieur et d'augmenter ainsi l'efficacité du refroidissement des LED 8' tout en limitant d'avantage la condensation sur la glace 3', de part un volume d'air chauffé proche de la glace 3' plus important.The dispersion part 12 is located in the internal volume 7 delimited by the enclosure 4 at a distance from the glass 3 'of between 5 mm and 50 mm. This dispersion part 12 comprises, in particular, fins 13 to improve the heat exchange with the interior air contained in the enclosure 4. These fins 13 extend transversely to the body 10 of the radiator 9 and are located close to the mirror. 3 'so as to bring as much heat as possible near the 3' mirror to limit condensation on the 3 'mirror. The fins 13 can, in particular, be oriented vertically in order to direct the internal air flow and thus increase the cooling efficiency of the LEDs 8 'while further limiting the condensation on the glass 3', on the part a larger volume of heated air close to the ice 3 '.

Le radiateur 9 est réalisé d'un seul bloc, c'est-à-dire que le corps 10, la partie de captage 11 et la partie de dispersion 12 sont réalisés à partir d'un même matériau, par exemple, par moulage d'un matériau conducteur. Il s'agit, par exemple, d'Aluminium ou d'un alliage d'Aluminium.The radiator 9 is made in one piece, that is to say that the body 10, the capture part 11 and the dispersion part 12 are made from the same material, for example, by molding 'a conductive material. It is, for example, Aluminum or an aluminum alloy.

Le premier dissipateur 14 est positionné au dessus du radiateur 9 au niveau de la paroi latérale supérieure 5". Il se situe, notamment, dans le prolongement du radiateur 9 selon un axe 29 parallèle au plan dans lequel s'étend l'élément transparent. Autrement dit, l'axe 29 coupe à la fois le radiateur 9 et le premier dissipateur 14. De manière complémentaire, le premier dissipateur 14 se situe dans le prolongement du radiateur 9 selon un axe 36 perpendiculaire à la paroi latérale supérieure 5", l'axe 36 étant verticale et coupant à la fois le radiateur 9 et le premier dissipateur 14.The first heat sink 14 is positioned above the heat sink 9 at the level of the upper side wall 5 ". It is located, in particular, in the extension of the heat sink 9 along an axis 29 parallel to the plane in which the transparent element extends. In other words, the axis 29 intersects both the radiator 9 and the first heat sink 14. Complementarily, the first heat sink 14 is located in the extension of the heat sink 9 along an axis 36 perpendicular to the upper side wall 5 ", the 'axis 36 being vertical and intersecting both the heat sink 9 and the first heat sink 14.

La présence de la surface froide que représente le premier dissipateur 14 située au dessus du radiateur 9 et dans son prolongement, crée un gradient de température entre la surface froide et la surface chaude. L'air intérieur monte ainsi en se réchauffant au contact du radiateur 9 et redescend rapidement après avoir été refroidit au contact du premier dissipateur 14 en créant alors un phénomène de convection naturelle à l'intérieur de l'enceinte 4. L'air intérieur réalise ainsi des boucles de circulation et on appelle flux d'air intérieur, représenté par la flèche 28, le flux d'air effectuant ces boucles. En plaçant le premier dissipateur 14 au dessus du radiateur 9 et en orientant les ailettes 13 du radiateur 9 verticalement, on augmente la vitesse de circulation du flux d'air intérieur de sorte que la convection naturelle est optimisée et que la dissipation de la chaleur dégagée par le dispositif de commande 33 est améliorée.The presence of the cold surface represented by the first dissipator 14 situated above the radiator 9 and in its extension, creates a temperature gradient between the cold surface and the hot surface. The interior air thus rises while heating in contact with the radiator 9 and then descends again rapidly after having been cooled in contact with the first dissipator 14, thus creating a phenomenon of natural convection inside the enclosure 4. The interior air produces thus circulation loops and the term internal air flow, represented by arrow 28, is the air flow effecting these loops. By placing the first heat sink 14 above the heat sink 9 and orienting the fins 13 of the heat sink 9 vertically, the speed of circulation of the internal air flow is increased so that the natural convection is optimized and the dissipation of the heat released. by the control device 33 is improved.

Un autre avantage vient du fait qu'en augmentant la vitesse de circulation du flux d'air intérieur, on augmente la vitesse de montée d'air chaud devant l'élément transparent 3 ce qui assure un meilleur désembuage de l'élément transparent 3.Another advantage comes from the fact that by increasing the speed of circulation of the internal air flow, the speed of rise of hot air in front of the transparent element 3 is increased, which ensures better demisting of the transparent element 3.

Le dispositif comprend en outre un premier conduit 18 disposé au dessus de l'enceinte 4 et apte à guider le flux d'air extérieur vers le premier dissipateur 14. Le premier conduit 18 est ainsi disposé sur la paroi latérale supérieure 5" de sorte que au moins une partie de l'embase 17 et la première série d'ailettes 15 se situent dans le premier conduit 18. Ainsi, le premier conduit 18 canalise le flux d'air extérieur qui peut s'engouffrer dans celui-ci et refroidir le premier dissipateur 14 par l'intermédiaire de la première série d'ailettes 15. Le flux d'air extérieur peut ensuite sortir du premier conduit 18 par un premier moyen d'évacuation 19 que comprend le premier conduit 18. Ce premier moyen d'évacuation 19 est, notamment, un orifice d'évacuation ou, par exemple, une grille 19'. On assure ainsi un renouvellement du flux d'air extérieur pour améliorer le refroidissement du premier dissipateur 14.The device further comprises a first duct 18 disposed above the enclosure 4 and capable of guiding the flow of outside air towards the first dissipator 14. The first duct 18 is thus disposed on the upper side wall 5 "so that at least part of the base 17 and the first series of fins 15 are located in the first duct 18. Thus, the first duct 18 channels the flow of outside air which can rush into it and cool the air. first dissipator 14 via the first series of fins 15. The flow of outside air can then leave the first duct 18 via a first discharge means 19 which the first duct comprises 18. This first evacuation means 19 is, in particular, an evacuation orifice or, for example, a grid 19 '. This ensures renewal of the external air flow to improve the cooling of the first heat sink 14.

La figure 2 illustre une variante de l'invention selon laquelle le dispositif 1 comprend un deuxième dissipateur thermique 20. Ce deuxième dissipateur 20 est situé, notamment, en dessous du radiateur 9 et réalise un échange thermique entre l'air contenu dans l'enceinte 4 et le flux d'air extérieur 30. On utilise un tel deuxième dissipateur 20 dans le cas où la puissance à dissiper et donc la chaleur à dissiper sont plus importantes.The figure 2 illustrates a variant of the invention according to which the device 1 comprises a second heat sink 20. This second heat sink 20 is located, in particular, below the heat sink 9 and performs a heat exchange between the air contained in the enclosure 4 and the external air flow 30. Such a second dissipator 20 is used in the case where the power to be dissipated and therefore the heat to be dissipated are greater.

Ce deuxième dissipateur 20 est distinct du premier dissipateur 14 et du radiateur 9. Le deuxième dissipateur 20 se situe, notamment, en dessous du radiateur 9, au niveau de la paroi latérale inférieure 5' de sorte qu'il contribue à favoriser la boucle de circulation de l'air intérieur. Le deuxième dissipateur 20 comprend, tout comme le premier dissipateur 14, une première série d'ailettes 21, une deuxième série d'ailettes 22 et une embase 23 interposée entre la première série 21 et la deuxième série 22. L'embase 23 est solidaire du boîtier 2, par exemple, au niveau de la paroi latérale inférieure 5'. La première série d'ailettes 21 s'étend ainsi dans le volume environnant où circule le flux d'air extérieur et la deuxième série d'ailettes 22 s'étend dans le volume interne délimité par l'enceinte 4. La première série d'ailettes 21, la deuxième série d'ailettes 22 et l'embase 23 du deuxième dissipateur 20 possèdent les mêmes caractéristiques que la première série d'ailettes 15, la deuxième série d'ailettes 16 et l'embase 17 du premier dissipateur 14.This second heat sink 20 is separate from the first heat sink 14 and from the heat sink 9. The second heat sink 20 is located, in particular, below the heat sink 9, at the level of the lower side wall 5 'so that it helps to promote the loop of indoor air circulation. The second heatsink 20 comprises, like the first heatsink 14, a first series of fins 21, a second series of fins 22 and a base 23 interposed between the first series 21 and the second series 22. The base 23 is integral. of the housing 2, for example, at the level of the lower side wall 5 '. The first series of fins 21 thus extends into the surrounding volume where the flow of external air circulates and the second series of fins 22 extends into the internal volume delimited by the enclosure 4. The first series of fins fins 21, the second series of fins 22 and the base 23 of the second heat sink 20 have the same characteristics as the first series of fins 15, the second series of fins 16 and the base 17 of the first heat sink 14.

Le deuxième dissipateur 20 est réalisé de manière unitaire, c'est-à-dire que sa première série d'ailettes 21, sa deuxième série d'ailettes 22 et son embase 23 sont issus du même matériau, notamment, métallique de sorte qu'ils sont en contact thermique. Ainsi, la première série d'ailettes 21 est refroidie par le flux d'air extérieur et refroidit à son tour l'embase 23 et la deuxième série d'ailettes 22 en contact avec l'air intérieur.The second dissipator 20 is produced in a unitary fashion, that is to say that its first series of fins 21, its second series of fins 22 and its base 23 are made from the same material, in particular metallic so that they are in thermal contact. Thus, the first series of fins 21 is cooled by the flow of outside air and in turn cools the base 23 and the second series of fins 22 in contact with the inside air.

Le dispositif 1 comprend un deuxième conduit 24 disposé en dessous de l'enceinte 4 et apte à guider le flux d'air extérieur vers le deuxième dissipateur 20 de la même manière qu'exposé précédemment pour le premier conduit 18. Le deuxième conduit 24 est ainsi disposé sur la paroi latérale inférieure 5' de sorte que au moins une partie de l'embase 23 et la première série d'ailettes 21 se situent dans le deuxième conduit 24. Ainsi, le flux d'air extérieur s'engouffre dans le deuxième conduit 24 et peut refroidir le deuxième dissipateur 20 par l'intermédiaire de la première série d'ailettes 21. Le flux d'air extérieur peut ensuite sortir du deuxième conduit 24 par un deuxième moyen d'évacuation 32 que comprend le deuxième conduit 24. Ce deuxième moyen d'évacuation 32 est, notamment, un orifice d'évacuation ou, par exemple, une grille 32'. On assure ainsi un renouvellement du flux d'air extérieur pour améliorer le refroidissement du deuxième dissipateur 14.The device 1 comprises a second duct 24 disposed below the enclosure 4 and capable of guiding the flow of outside air towards the second dissipator 20 of the same way as explained above for the first duct 18. The second duct 24 is thus arranged on the lower side wall 5 'so that at least part of the base 23 and the first series of fins 21 are located in the second duct 24. Thus, the flow of outside air rushes into the second duct 24 and can cool the second heat sink 20 via the first series of fins 21. The flow of outside air can then exit of the second conduit 24 by a second discharge means 32 which the second conduit 24 comprises. This second discharge means 32 is, in particular, an discharge orifice or, for example, a grid 32 '. This ensures renewal of the external air flow to improve the cooling of the second heat sink 14.

La présence du premier dissipateur 14 et du deuxième dissipateur 20 permet ainsi d'augmenter la capacité d'échange avec l'extérieur et donc de réduire la taille et la masse du radiateur 9.The presence of the first dissipator 14 and of the second dissipator 20 thus makes it possible to increase the exchange capacity with the exterior and therefore to reduce the size and the mass of the radiator 9.

La figure 2 permet également d'illustrer une variante de l'invention selon lequel un moyen de conduction thermique 25 est positionné entre le radiateur 9 et le deuxième dissipateur 20. Le moyen de conduction thermique 25 est une pièce métallique permettant d'effectuer un transfert de chaleur du radiateur 9 vers le deuxième dissipateur 20 pour faciliter le refroidissement du radiateur 9. Le moyen de conduction thermique 25 permet d'augmenter la capacité du radiateur 9 à dissiper la chaleur dégagée par le dispositif de commande 33 des LED 8' et donc de réduire la masse embarquée du radiateur 9. Le moyen de conduction thermique 25 est un drain qui conduit les calories en provenance du radiateur directement au deuxième dissipateur.The figure 2 also makes it possible to illustrate a variant of the invention according to which a thermal conduction means 25 is positioned between the radiator 9 and the second dissipator 20. The thermal conduction means 25 is a metal part making it possible to transfer heat from the heat sink. heat sink 9 to the second heat sink 20 to facilitate cooling of the heat sink 9. The thermal conduction means 25 makes it possible to increase the capacity of the heat sink 9 to dissipate the heat given off by the control device 33 of the LEDs 8 'and therefore to reduce the on-board mass of the radiator 9. The thermal conduction means 25 is a drain which conducts the calories coming from the radiator directly to the second dissipator.

Comme c'est le cas pour le radiateur 9, une portion 26 du ou des dissipateurs 14, 20, s'étend à une distance de la glace inférieure à 50 mm. Ainsi le premier dissipateur 14 le radiateur 9 et le deuxième dissipateur 20 sont coupés par l'axe 29 parallèle au plan dans lequel s'étend l'élément transparent 3 et par l'axe 36 perpendiculaire à la paroi latérale supérieure 5".As is the case for the radiator 9, a portion 26 of the heat sink (s) 14, 20, extends at a distance from the glass of less than 50 mm. Thus, the first heat sink 14, the heat sink 9 and the second heat sink 20 are cut by the axis 29 parallel to the plane in which the transparent element 3 extends and by the axis 36 perpendicular to the upper side wall 5 ".

La figure 3 illustre une variante de réalisation de l'invention selon laquelle l'embase 17, 23 du ou des dissipateurs 14, 20, possède des ventilations 27 aptes à faire circuler le flux d'air extérieur à l'intérieur de l'enceinte 4. En plaçant les ventilations 27 sur l'embase 17, 23 du ou des dissipateurs 14, 20, on profite ainsi de l'ouverture dans le boîtier engendré par celles-ci pour installer les dissipateurs. On évite de cette manière de ménager un trou supplémentaire pour assurer la ventilation du volume interne 7.The figure 3 illustrates an alternative embodiment of the invention according to which the base 17, 23 of the dissipator (s) 14, 20, has ventilations 27 capable of circulate the flow of outside air inside the enclosure 4. By placing the ventilations 27 on the base 17, 23 of the heat sink (s) 14, 20, one thus takes advantage of the opening in the housing generated by these to install the heatsinks. In this way, an additional hole is avoided to ensure ventilation of the internal volume 7.

La flèche 31 représente la circulation du flux d'air extérieur entré par l'intermédiaire des ventilations 27 à l'intérieur du volume intérieur 7. Les ventilations 27 sont ainsi situées en dessous du radiateur 9. Ces ventilations 27 permettent d'augmenter la circulation d'air à l'intérieur de l'enceinte 4 en autorisant l'introduction du flux d'air extérieur présent dans le deuxième conduit 24 à pénétrer à l'intérieur du volume 7. Ces ventilations 27 sont, notamment, des membranes soudées sur le boîtier 2 ou sur la glace 3' ou des chicanes avec filtre.The arrow 31 represents the circulation of the external air flow entered by means of the ventilations 27 inside the interior volume 7. The ventilations 27 are thus located below the radiator 9. These ventilations 27 make it possible to increase the circulation. air inside the enclosure 4 by allowing the introduction of the outside air flow present in the second duct 24 to penetrate inside the volume 7. These ventilations 27 are, in particular, membranes welded to the housing 2 or on the ice 3 'or baffles with filter.

La figure 4 illustre une variante de réalisation qui n'est pas couverte par la revendication 1 et selon laquelle on place directement le dispositif de commande 33 sur le radiateur, sur une zone proche de la glace 3', c'est-à-dire une zone située à moins de 50 mm de la glace 3'. Dans cette variante de réalisation, le dispositif 1 comprend également le premier dissipateur 14 et le radiateur 9 mais ce dernier ne possède pas de partie de dispersion 12 puisque la chaleur est directement dégagée par le dispositif de commande 33 dans une zone proche de la glace 3'. Le dispositif de commande 33 permet ainsi d'emmener de la chaleur proche de la glace 3' et d'obtenir le désembuage de la glace 3'.The figure 4 illustrates an alternative embodiment which is not covered by claim 1 and according to which the control device 33 is placed directly on the radiator, on a zone close to the window 3 ', that is to say a zone situated within 50 mm of the 3 'ice. In this variant embodiment, the device 1 also comprises the first heat sink 14 and the heat sink 9 but the latter does not have a dispersion part 12 since the heat is directly released by the control device 33 in an area close to the glass 3 '. The control device 33 thus makes it possible to bring heat close to the ice 3 'and to obtain the demisting of the ice 3'.

De la même manière qu'expliqué précédemment, le radiateur 9 comprend la zone de captage 11 munie des connexions thermiques 11'.In the same way as explained above, the radiator 9 comprises the collection zone 11 provided with the thermal connections 11 '.

La figure 4 permet également d'illustrer un masque 34 que comprend le dispositif 1 et qui s'étend entre la source lumineuse 8 et le dispositif de commande 33, le masque couvrant ce dernier. Son but est, notamment, de cacher des éléments constitutifs du dispositif 1 comme par exemple le radiateur 9 et le dispositif de commande 33, afin qu'ils ne soient pas visibles de l'extérieur à travers l'élément transparent 3. Le masque 34 pourrait également être relié directement de la source lumineuse 8 au radiateur 9.The figure 4 also makes it possible to illustrate a mask 34 which the device 1 comprises and which extends between the light source 8 and the control device 33, the mask covering the latter. Its purpose is, in particular, to hide the constituent elements of the device 1 such as for example the radiator 9 and the control device 33, so that they are not visible from the outside through the transparent element 3. The mask 34 could also be connected directly from the light source 8 to the radiator 9.

Dans cet exemple de réalisation, le dispositif de commande 33 est disposé sur la partie de dispersion 12, à proximité de la glace 3'. Autrement dit, le dispositif de commande 33 est ici situé dans le volume interne à une distance de la glace 3' comprise entre 5 mm et 50 mm. De cette manière, on utilise la chaleur dégagée par le dispositif de commande 33 pour créer des flux d'air convectifs au plus prés de la glace 3' afin d'assurer le désembuage de la condensation pouvant se créer sur une face interne de l'élément transparent 3.In this exemplary embodiment, the control device 33 is placed on the dispersion part 12, near the ice 3 '. In other words, the control device 33 is here located in the internal volume at a distance from the glass 3 'of between 5 mm and 50 mm. In this way, the heat given off by the control device 33 is used to create convective air flows as close as possible to the ice 3 'in order to ensure the demisting of the condensation that may be created on an internal face of the ice. transparent element 3.

Claims (14)

  1. Lighting and/or signalling device (1) comprising a housing (2), a transparent element (3) delimiting, with the housing (2), an enclosure (4), a light source (8) and at least one radiator (9) in thermal contact with said source (8), the radiator (9) extending in the enclosure (4), and the device (1) comprising at least one heat sink (14), called first sink (14), which produces a heat exchange between air contained in the enclosure (4) and a flow of air outside the enclosure (4), characterized in that the radiator (9) has a part (12) for dispersing heat given off by said source (8) and a part (11) for picking up said heat, said dispersion part (12) being situated in an internal volume (7) delimited by the enclosure (4) at a distance from the transparent element (3) of between 5 mm and 50 mm.
  2. Device (1) according to Claim 1, wherein the radiator (9) and the first sink (14) are distinct.
  3. Device (1) according to either one of the preceding claims, wherein the first sink (14) comprises a first series of fins (15), a second series of fins (16) and a base (17) interposed between the first series (15) and the second series (16), said base (17) being secured to the housing (2) while the first series of fins (15) extends into a surrounding volume in which the flow of outside air circulates, the second series of fins (16) extends in the internal volume (7).
  4. Device (1) according to any one of the preceding claims, wherein the first sink (14) is situated above the radiator (9).
  5. Device (1) according to Claim 4, wherein the first sink (14) is situated in the extension of the radiator (9).
  6. Device (1) according to any one of the preceding claims, said device (1) comprising a first duct (18) disposed above the enclosure (4) and capable of guiding the outside air flow to the first sink (14), and wherein the first duct (18) comprises a first evacuation means (19) allowing the outside air flow to exit from the first duct (18).
  7. Device (1) according to any one of the preceding claims, said device (1) comprising a second heat sink (20) situated below the radiator (9) and which produces a heat exchanger between the air contained in the enclosure (4) and the outside air flow.
  8. Device (1) according to Claim 7, wherein the second device (20) is distinct from the radiator (9) and from the first sink (14).
  9. Device (1) according to either one of Claims 7 and 8, wherein the second sink (20) comprises a first series of fins (21), a second series of fins (22) and a base (23) interposed between the first series (21) and the second series (22), said base (23) being secured to the housing (2) while the first series of fins (21) extends in a surrounding volume in which the outside air flow circulates, the second series of fins (22) extends in a volume delimited by the enclosure (4).
  10. Device (1) according to any one of Claims 7 to 9, comprising a second duct (24) disposed below the enclosure (4) and capable of guiding the outside air flow to the second sink (20), and wherein the second duct (24) comprises a second evacuation means (32) allowing the air flow to exit from the second duct (24) .
  11. Device (1) according to any one of Claims 7 to 10, wherein a heat conduction means (25) is linked on one side to the radiator 9 and on the other side to the second sink (20).
  12. Device (1) according to any one of the preceding claims, wherein a part of the base (17, 23) of the sink or sinks (14, 20) is overmoulded in the housing (2) .
  13. Device (1) according to any one of the preceding claims, wherein the base (17, 23) of the sink or sinks (14, 20) has ventilations (27) capable of making the outside air flow circulate inside the enclosure (4).
  14. Device (1) according to Claim 13, wherein the ventilations (27) are situated below the radiator (9) .
EP12170716.0A 2011-06-07 2012-06-04 Lighting and/or signalling device with built-in radiator and heat sink Active EP2532949B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1154949A FR2976345B1 (en) 2011-06-07 2011-06-07 INTEGRATING RADIATOR AND DISSIPATOR LIGHTING AND / OR SIGNALING DEVICE

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EP2532949A3 EP2532949A3 (en) 2013-03-20
EP2532949B1 true EP2532949B1 (en) 2020-10-14

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JP6235283B2 (en) * 2013-09-24 2017-11-22 株式会社東芝 Lighting device

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US7275848B2 (en) * 2005-02-16 2007-10-02 Visteon Global Technologies, Inc. Headlamp assembly having cooling channel
US7249868B2 (en) * 2005-07-07 2007-07-31 Visteon Global Technologies, Inc. Lamp housing with interior cooling by a thermoelectric device
JP2007220618A (en) * 2006-02-20 2007-08-30 Stanley Electric Co Ltd LED lights for vehicles
US20090059594A1 (en) * 2007-08-31 2009-03-05 Ming-Feng Lin Heat dissipating apparatus for automotive LED lamp

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EP2532949A2 (en) 2012-12-12
FR2976345A1 (en) 2012-12-14
FR2976345B1 (en) 2015-05-01
EP2532949A3 (en) 2013-03-20

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