EP3671024A1 - Wärmeübertragungssystem für ein beleuchtungsmodul eines kraftfahrzeugs - Google Patents

Wärmeübertragungssystem für ein beleuchtungsmodul eines kraftfahrzeugs Download PDF

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Publication number
EP3671024A1
EP3671024A1 EP18382989.4A EP18382989A EP3671024A1 EP 3671024 A1 EP3671024 A1 EP 3671024A1 EP 18382989 A EP18382989 A EP 18382989A EP 3671024 A1 EP3671024 A1 EP 3671024A1
Authority
EP
European Patent Office
Prior art keywords
airfoils
anodized
heat transfer
lighting module
heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18382989.4A
Other languages
English (en)
French (fr)
Other versions
EP3671024B1 (de
Inventor
Carlos Gomez
Macarena BUENO
Juan-Carlos PARRAS
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 Iluminacion SA
Original Assignee
Valeo Iluminacion SA
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 Iluminacion SA filed Critical Valeo Iluminacion SA
Priority to EP18382989.4A priority Critical patent/EP3671024B1/de
Publication of EP3671024A1 publication Critical patent/EP3671024A1/de
Application granted granted Critical
Publication of EP3671024B1 publication Critical patent/EP3671024B1/de
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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
    • 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

Definitions

  • the present invention relates to a heat transfer system for a lighting module of a motor vehicle.
  • the invention also relates to a motor vehicle lighting device comprising such a lighting module.
  • lighting modules comprising a light source using LEDs (light-emitting diodes) is known.
  • Such system lighting modules using light source comprising LEDs makes it possible to provide proper lighting in front of the vehicle. They are therefore used to perform various functions such as for example road lighting function to illuminate the path and also avoid dazzling other motorists, or for signaling functions.
  • such a lighting module can become very hot due to the use of LEDs and the heat generated by the motor compartment. Excessive heating leads to malfunction of the LED or even destruction of the system and/ or the control circuit. It is therefore needed to cool the lighting module, in order to keep the LED under their junction temperature, above which their performance is decreasing.
  • the use of heatsinks with airfoils or fins is known.
  • such cooling means are not always sufficiently efficient in maintaining the lighting module below a damaging temperature.
  • active cooling with fans blowing air toward the fins of the heat sink or anodization or cataphoresis.
  • Patent such as KR 20160000832 U and US 2008175008 A1 .
  • This prior art discloses surface treated led lamp by arc plasma anodizing and also improvement of heatsink radiation by vacuum sputtering, vaporization and anodizing respectively. Both the prior art document, talk about anodizing of all the fins of the heat sink. Such methods are complicated in nature and therefore costly.
  • An object of the present invention is to solve at least partially the disadvantages described above of known lighting module.
  • a lighting module for an automotive vehicle comprising a light source for producing a light beam in front of the vehicle.
  • the lighting module further comprises a heat exchange system for transferring heat away from the light source, the heat exchange system.
  • the heat exchange system has a heat sink plate and plurality of heat transfer airfoils thermally connected to the heat sink plate.
  • the heat transfer airfoils of the heat exchange system have a plurality of non-anodized heat transfer airfoils and a pair of anodized heat transfer airfoils.
  • the pair of anodized heat transfer airfoils are at peripheral portion encompassing the plurality of non-anodized airfoils of the heat exchange system. Indeed, such an arrangement wherein only peripheral airfoils are anodized has shown to decrease significantly the junction temperature compared to a heat exchange system without any anodized airfoils and is quite as efficient than a full set of anodized airfoils, for a much better production cost.
  • the heat sink plate of the heat transfer system is provided with an enveloping airfoil over the plurality of non-anodized heat transfer airfoils and the pair of anodized heat transfer airfoils.
  • the enveloping airfoil of the embodiment of the present invention is connected on the anodized heat transfer airfoil at peripheral portion of the heat exchange system.
  • the enveloping airfoil is also anodized to improve the heat transfer. This arrangement increases further the heat transfer efficiency, while still limiting the cost compared to a full set of anodized airfoils.
  • one of the heat transfer airfoil is provided at peripheral portion is orientated towards the visible side of the lighting module.
  • the heat transfer airfoil oriented towards the visible side of the lighting module is anodized to improve the heat transfer.
  • the anodized heat transfer airfoil are provided with a thin plastic coating to improve the heat transfer and the aesthetic of the lighting module, when considering the heat transfer airfoil oriented towards the visible side of the lighting module.
  • the thin plastic coating provided on the heat transfer airfoil is lower than 100 microns.
  • Figure 1 shows a perspective view of a heat exchange system 100 of lighting device having a light source 10 such as LED for producing a light beam, according to an embodiment of the present invention.
  • a light source 10 such as LED for producing a light beam
  • the heat exchange system (100) shown in Figure 1 comprises a heat sink plate (11) provided with a plurality of heat transfer airfoils for transferring heat away from the heat sink plate 11.
  • the lighting module is provided with such heat exchange system for reducing heat generated inside the module.
  • Such heat sink plate are provided with plurality of airfoils to increase heat convection dissipation.
  • surface treatment such as anodization or cataphoresis is done to increasing radiation emissivity of the airfoils. But the only surface where this emissivity improvement is useful is the outer surface because of the emission of inner airfoils is compensated by the emission of its in front airfoils.
  • the pluralities of heat transfer airfoils of heat exchange system 100 of the present invention are made of two types.
  • the heat exchange system 100 is provided with a plurality of non-anodized heat transfer airfoils 14 and a pair of anodized heat transfer airfoils 12.
  • the pair of anodized heat transfer airfoils 12 is placed at peripheral portion of the heat sink plate 11.
  • the pair anodized heat transfer airfoils 12 are arranged such that they encompass the plurality of non-anodized heat transfer airfoils 14 of the heat exchange system 100.
  • the plurality of non-anodized heat transfer airfoils 14 and the pair of anodized heat transfer airfoils 12 are thermally connected to the heat sink plate 11 and radiate outwards.
  • Comparative test showed that the design according to the invention allowed a decrease of 14.5 °C of the junction temperature of the LED compared to a heat sink plate provided with a full set of non anodized airfoils whereas a full set of anodized airfoils allowed to achieve a decrease of 18°C of the junction temperature of the LED.
  • FIG. 2 shows another embodiment of the present invention.
  • the heat transfer system 100 comprises a heat sink plate 11, a plurality or non-anodized heat transfer airfoil 14 and a pair of anodized heat transfer airfoils 12. Additionally, the heat transfer system 100 comprises an enveloping airfoil 16. The enveloping airfoil 16 is connected on the pair of anodized heat transfer airfoil 12 provided at peripheral portion of the heat exchange system (100). The embodiment provides emissivity improvement on the outer side of this surface. The enveloping airfoil 16 of the present invention is also anodized to attain the objectives according to the scope of invention.
  • At least one anodized heat transfer airfoil 12 at peripheral portion is orientated towards the visible side of the lighting module.
  • the Figure shows a light source 10 such as a LED assembled inside the housing 20 of a motor vehicle lighting device.
  • the figure also shows the heat sink plate 11 arranged in relation to the light source 10. The provision of the anodized airfoil in the visible area of the lighting device provides higher heat dissipation due to relatively lower temperature near the outer side of lighting device.
  • Figure 4 shows another embodiment of the present invention where the at least one anodized heat transfer airfoil 12 , for instance here the one provided at peripheral portion, is coated with a thin plastic coating 12a.
  • the size of the thin plastic coating 12a provided on the heat transfer airfoil 12 is lower than 100 microns.
  • the thin plastic coating 12a is provided with additional aesthetic design or feature to improve the design of the lighting module. The addition of the thin plastic coating 12a further improves the emissivity of the heat sink and ensures better heat transfer in the lighting module.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
EP18382989.4A 2018-12-21 2018-12-21 Wärmeübertragungssystem für ein beleuchtungsmodul eines kraftfahrzeugs Active EP3671024B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18382989.4A EP3671024B1 (de) 2018-12-21 2018-12-21 Wärmeübertragungssystem für ein beleuchtungsmodul eines kraftfahrzeugs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18382989.4A EP3671024B1 (de) 2018-12-21 2018-12-21 Wärmeübertragungssystem für ein beleuchtungsmodul eines kraftfahrzeugs

Publications (2)

Publication Number Publication Date
EP3671024A1 true EP3671024A1 (de) 2020-06-24
EP3671024B1 EP3671024B1 (de) 2022-01-05

Family

ID=65010518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18382989.4A Active EP3671024B1 (de) 2018-12-21 2018-12-21 Wärmeübertragungssystem für ein beleuchtungsmodul eines kraftfahrzeugs

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EP (1) EP3671024B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080175008A1 (en) 2007-01-23 2008-07-24 Foxconn Technology Co., Ltd. Light-emitting diode assembly and method of fabrication
US20110068687A1 (en) * 2009-02-04 2011-03-24 Kenzi Takahasi Bulb-shaped lamp and lighting device
EP2762771A2 (de) * 2013-02-04 2014-08-06 LG Innotek Co., Ltd. Beleuchtungsvorrichtung für ein Fahrzeug, Strahlungsvorrichtung und Beleuchtungsvorrichtung
KR20160000832U (ko) 2014-08-29 2016-03-10 주식회사 삼광산전 Ａｐａ적용 엘이디 등기구
US20160084460A1 (en) * 2014-09-24 2016-03-24 Truck-Lite Co., Llc Headlamp with Lens Reflector Subassembly
EP3168526A1 (de) * 2015-11-12 2017-05-17 Toyota Jidosha Kabushiki Kaisha Fahrzeugscheinwerfer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080175008A1 (en) 2007-01-23 2008-07-24 Foxconn Technology Co., Ltd. Light-emitting diode assembly and method of fabrication
US20110068687A1 (en) * 2009-02-04 2011-03-24 Kenzi Takahasi Bulb-shaped lamp and lighting device
EP2762771A2 (de) * 2013-02-04 2014-08-06 LG Innotek Co., Ltd. Beleuchtungsvorrichtung für ein Fahrzeug, Strahlungsvorrichtung und Beleuchtungsvorrichtung
KR20160000832U (ko) 2014-08-29 2016-03-10 주식회사 삼광산전 Ａｐａ적용 엘이디 등기구
US20160084460A1 (en) * 2014-09-24 2016-03-24 Truck-Lite Co., Llc Headlamp with Lens Reflector Subassembly
EP3168526A1 (de) * 2015-11-12 2017-05-17 Toyota Jidosha Kabushiki Kaisha Fahrzeugscheinwerfer

Also Published As

Publication number Publication date
EP3671024B1 (de) 2022-01-05

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