EP3081848A1 - Vorrichtung zur wärmeableitung für optisches modul mit hoher thermischer leistungsfähigkeit - Google Patents

Vorrichtung zur wärmeableitung für optisches modul mit hoher thermischer leistungsfähigkeit Download PDF

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Publication number
EP3081848A1
EP3081848A1 EP16164762.3A EP16164762A EP3081848A1 EP 3081848 A1 EP3081848 A1 EP 3081848A1 EP 16164762 A EP16164762 A EP 16164762A EP 3081848 A1 EP3081848 A1 EP 3081848A1
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EP
European Patent Office
Prior art keywords
optical module
thermoplastic material
thermally conductive
group
copper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16164762.3A
Other languages
English (en)
French (fr)
Inventor
Marc Brassier
Jean-Claude Puente
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 EP3081848A1 publication Critical patent/EP3081848A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—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
    • 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/87—Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
    • 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
    • F21V29/85—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems characterised by the material
    • F21V29/89—Metals
    • 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 present invention relates to the field of lighting devices for a motor vehicle in particular, and particularly include projectors equipping such vehicles.
  • the subject of the invention is a heat dissipation device intended to equip at least one optical module of a motor vehicle.
  • This device is more precisely of the finned heat sink type.
  • Such a device can dissipate the heat produced by a light source of the optical module, from a convection obtained by natural upward movement of the hot air with respect to gravity along the fins.
  • Automotive headlamps are generally composed of a housing that 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 the light beam 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 to send back the light directly emitted by the LED in a general direction of emergence of the light outside 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 heat sink advantageously provided with fins, arranged as a finned radiator or the like.
  • 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 heat dissipating device made of metallic material.
  • the use of such a material involves particular manufacturing processes such as injection molding or strip folding ... and may require the assembly of many parts.
  • Another difficulty is to integrate such a device in various and complex forms within the optical module.
  • it is a question of obtaining, in a simple and industrial way, the desired shapes to adapt to the shapes of the optical module and to carry out functions such as the fixing functions of the module.
  • the object of the invention is to remedy these drawbacks by providing a heat sink intended to equip at least one optical module that comprises a lighting and / or signaling device for a motor vehicle, of simple design, with a limited space requirement. and with efficient cooling performance.
  • the invention achieves this in that the heat dissipating device is made of two parts reported by molding: one carrying the fins for cooling, made by extrusion of metal material, the other carrying fastening means, made of thermoplastic material to be overmolded on the first part.
  • the heat dissipation device thus comprises two elements made of a material each and according to a method related to its function within the device.
  • the heat exchanges between the device and the surrounding air are thus optimized and greatly improved compared to their injection molding, while at the same time allowing easy integration into any type. optical module, by overmolding the first element by the second element.
  • the overmoulding process allows a simple and fast manufacturing, the realization of the second element being done at the same time as it is reported on the first element.
  • the metallic material is chosen from the group comprising: aluminum, magnesium, copper, and an alloy of at least one of these materials.
  • the metallic material is aluminum.
  • an extruded aluminum radiator has a thermal conductivity of the order of twice.
  • thermoplastic material is thermally conductive.
  • the device according to the invention then has a double advantage over known devices: it has an even greater thermal performance combined with ease of machining of the complete device.
  • thermoplastic material may then comprise a thermoplastic resin selected from the group comprising: polyamide, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyphthalamide, polyacrylic acid. It may also comprise fillers chosen alone or in combination in the group comprising: nano particles, zinc sulphide, boron nitride, particles based on carbon, copper and copper alloy (brass).
  • a thermoplastic resin selected from the group comprising: polyamide, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyphthalamide, polyacrylic acid. It may also comprise fillers chosen alone or in combination in the group comprising: nano particles, zinc sulphide, boron nitride, particles based on carbon, copper and copper alloy (brass).
  • the invention also relates to an optical module of a motor vehicle, comprising at least one heat dissipation device according to the invention.
  • the module preferably comprises at least one light source comprising at least one light emitting diode.
  • a metal material chosen from the group comprising: aluminum, magnesium, copper, and an alloy of at least one of these materials is used.
  • thermoplastic material is used.
  • thermoplastic material comprising a thermoplastic resin chosen from the group comprising: polyamide, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyphthalamide, polyacrylic acid.
  • thermoplastic material comprising fillers chosen alone or in combination in the group comprising: nano particles, zinc sulphide, boron nitride, carbon-based particles, copper and copper alloy (brass).
  • FIG. 1 illustrates an exemplary embodiment of the heat dissipation device 1 according to the invention.
  • the primary function of the first element 2 is to dissipate the heat produced by a light source, such as a LED light emitting diode.
  • the fins allow to dissipate the heat produced by the light source of the optical module, from a convection obtained by natural upward movement of hot air with respect to gravity along the fins.
  • the finer fins 3 are, the more the first element 2 may comprise fins 3, and therefore, the greater its exchange surface with air is important, to optimize the heat exchange that takes place between them. surface and air, which heats up in contact with the fins.
  • the first element 2 is produced by an extrusion process, because such a method makes it possible to produce very thin fins, thus maximizing the exchange surface between the first element 2 and the air.
  • Such an extrusion process is a process in which a compressed material is forced through a die having the section of the workpiece to be obtained. The first element 2 is thus continuously formed.
  • the section of the die corresponds to the shape of the first element 2 represented on the figure 2 .
  • the heat from a light source, and recovered by the first element 2, is transmitted to the fins 3 so that the heat exchange takes place.
  • the first element 2 is made of a metal material selected for its heat exchange capacity, that is to say its ability to transfer the heat acquired to another medium here air.
  • one of the following metallic materials is preferably used to manufacture the first element 2: aluminum, magnesium, copper, and an alloy of at least one of these materials.
  • the first element 2, heat exchanger, is intended to be fixed on an optical module.
  • the device 1 comprises a second element 4 comprising at least one attachment means 5 of the device 1 on the optical module.
  • the device comprises five fastening means 5 each consisting of an orifice, adapted to receive a system such as a rivet, a screw, etc.
  • the fastening means 5 are latching means for example.
  • thermoplastic material is used. Indeed, this material makes it possible to manufacture parts by molding, and makes it possible to finely create pieces of complex shapes.
  • the second element 4 is overmolded on the first element 2. This also makes it possible to manufacture the second element 4 at the same time as this element 4 is related to the first element 2 .
  • the first element 2 may be placed in the impression of a compression mold, and then thermoplastic material may be placed in the impression. The mold is closed, and a pressure is applied to make the material flow so that it takes the shape of the impression while overmolding the first element 2.
  • first element 2 it is also possible to place the first element 2 in the cavity of an injection mold. Then, the mold is closed, and the thermoplastic material is injected so that it takes the form of the impression while overmolding the first element 2.
  • the first element 2 has lateral extensions, extending perpendicularly to the fins from the base supporting the latter. These extensions make it possible to favor the maintenance of elements 2, 4 and overmoulded.
  • the thermoplastic material used is thermally conductive, so as to improve the thermal performance of the heat dissipating device 1, making this device a device with high thermal efficiency.
  • This device 1 then has a double advantage over known devices: it has an increased thermal performance combined with ease of machining of the complete device.
  • thermoplastic thermally conductive materials Those skilled in the art know thermoplastic thermally conductive materials.
  • thermoplastic material whose thermal conductivity is greater than 10 Wm -1 .K -1 is preferably chosen.
  • Thermal conductivity is the amount of heat transferred per unit area and time under a temperature gradient of 1 kelvin per meter.
  • thermoplastic material comprising a thermoplastic resin and fillers whose nature, shape and size are chosen to increase the thermal conductivity of the resin alone can be used.
  • thermoplastic resin selected from the group consisting of polyamide, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyphthalamide, polyacrylic acid can be used.
  • fillers chosen from the group comprising: nano particles, zinc sulphide, boron nitride, carbon-based particles, copper and copper alloy (brass).
  • the heat dissipation device 1 according to the invention is intended to equip at least one motor vehicle headlight optical module.
  • the invention also relates to an optical module of a motor vehicle, comprising at least one heat dissipation device 1 according to the invention.
  • This optical module may also include at least one light source comprising at least one LED.
  • thermoplastic material is used.
  • thermoplastic material comprising a thermoplastic resin selected from the group: polyamide, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyphthalamide, polyacrylic acid.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Led Device Packages (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP16164762.3A 2015-04-16 2016-04-11 Vorrichtung zur wärmeableitung für optisches modul mit hoher thermischer leistungsfähigkeit Withdrawn EP3081848A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1553414A FR3035203B1 (fr) 2015-04-16 2015-04-16 Dispositif de dissipation de chaleur pour module optique a haut rendement thermique

Publications (1)

Publication Number Publication Date
EP3081848A1 true EP3081848A1 (de) 2016-10-19

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EP16164762.3A Withdrawn EP3081848A1 (de) 2015-04-16 2016-04-11 Vorrichtung zur wärmeableitung für optisches modul mit hoher thermischer leistungsfähigkeit

Country Status (3)

Country Link
EP (1) EP3081848A1 (de)
CN (1) CN206036973U (de)
FR (1) FR3035203B1 (de)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US821662A (en) 1904-11-10 1906-05-29 Gideon D Miller Superheater for boiler fire-boxes.
US6162849A (en) 1999-01-11 2000-12-19 Ferro Corporation Thermally conductive thermoplastic
WO2001096458A1 (de) 2000-06-16 2001-12-20 Siemens Aktiengesellschaft Füllstoff für wärmeleitende kunststoffe, wärmeleitender kunststoff und herstellungsverfahren dazu
US7902283B2 (en) 2006-06-20 2011-03-08 Polyone Corporation Polyamide compounds containing zinc sulfide
FR2965699A1 (fr) * 2010-10-05 2012-04-06 Commissariat Energie Atomique Dispositif pour la dissipation thermique destine a au moins un composant electronique et procede correspondant
KR101139412B1 (ko) 2008-12-24 2012-04-27 제일모직주식회사 열전도성 절연 수지 조성물 및 플라스틱 성형품
DE202013001467U1 (de) * 2013-02-14 2013-02-25 Oechsler Aktiengesellschaft Kühlkörper für LED-Scheinwerfer
US8685534B2 (en) 2004-06-15 2014-04-01 Siemens Energy, Inc. High thermal conductivity materials aligned within resins
EP2821689A1 (de) * 2013-07-02 2015-01-07 Toshiba Lighting & Technology Corporation Lichtemittierende Vorrichtung und Beleuchtungsvorrichtung
DE102013108248A1 (de) * 2013-08-01 2015-02-05 Hella Kgaa Hueck & Co. Beleuchtungssystem, insbesondere für einen Kraftfahrzeugscheinwerfer mit einem Kühlkörper

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US821662A (en) 1904-11-10 1906-05-29 Gideon D Miller Superheater for boiler fire-boxes.
US6162849A (en) 1999-01-11 2000-12-19 Ferro Corporation Thermally conductive thermoplastic
WO2001096458A1 (de) 2000-06-16 2001-12-20 Siemens Aktiengesellschaft Füllstoff für wärmeleitende kunststoffe, wärmeleitender kunststoff und herstellungsverfahren dazu
US8685534B2 (en) 2004-06-15 2014-04-01 Siemens Energy, Inc. High thermal conductivity materials aligned within resins
US7902283B2 (en) 2006-06-20 2011-03-08 Polyone Corporation Polyamide compounds containing zinc sulfide
KR101139412B1 (ko) 2008-12-24 2012-04-27 제일모직주식회사 열전도성 절연 수지 조성물 및 플라스틱 성형품
FR2965699A1 (fr) * 2010-10-05 2012-04-06 Commissariat Energie Atomique Dispositif pour la dissipation thermique destine a au moins un composant electronique et procede correspondant
DE202013001467U1 (de) * 2013-02-14 2013-02-25 Oechsler Aktiengesellschaft Kühlkörper für LED-Scheinwerfer
EP2821689A1 (de) * 2013-07-02 2015-01-07 Toshiba Lighting & Technology Corporation Lichtemittierende Vorrichtung und Beleuchtungsvorrichtung
DE102013108248A1 (de) * 2013-08-01 2015-02-05 Hella Kgaa Hueck & Co. Beleuchtungssystem, insbesondere für einen Kraftfahrzeugscheinwerfer mit einem Kühlkörper

Also Published As

Publication number Publication date
FR3035203A1 (fr) 2016-10-21
FR3035203B1 (fr) 2018-06-15
CN206036973U (zh) 2017-03-22

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