EP2722579A1 - Phare de véhicule automobile avec source de lumière et dispositif de refroidissement pour la source de lumière - Google Patents
Phare de véhicule automobile avec source de lumière et dispositif de refroidissement pour la source de lumière Download PDFInfo
- Publication number
- EP2722579A1 EP2722579A1 EP13184495.3A EP13184495A EP2722579A1 EP 2722579 A1 EP2722579 A1 EP 2722579A1 EP 13184495 A EP13184495 A EP 13184495A EP 2722579 A1 EP2722579 A1 EP 2722579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover
- headlight
- cooling element
- heat
- light source
- 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
Links
Images
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
- 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
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
- F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/265—Transparent cover plates, e.g. for protecting the interior of the signalling devices against environmental influences
Definitions
- the present invention relates to a headlamp of a motor vehicle comprising at least one light source, which is associated with a cooling device, and a housing having a light exit opening, which is closed by a translucent cover.
- the headlight housing is usually made of plastic.
- the cover is preferably made of glass or plastic. It can be designed as a lens at least partially with optically active elements (eg cylindrical lenses, prisms, etc.). It is also conceivable that the cover is formed as a clear disc without optically active elements.
- the headlamps are used in the front area of a motor vehicle provided there suitable mounting holes and there at the Vehicle body attached.
- a motor vehicle headlamp comprises in its housing interior at least one light module for generating at least part of a predetermined light distribution (for example dipped beam, high beam, fog light or any adaptive headlight function).
- the light module comprises at least one light source and may be designed as a reflection module or as a projection module.
- a reflection module the light emitted by the light source is focused by a reflector and reflected to produce the desired light distribution on the road ahead of the vehicle.
- a projection module the light emitted from the light source is collimated by primary optics (e.g., reflector or attachment optics) and then projected onto the road ahead of the vehicle by secondary optics (e.g., projection lens or reflector) to produce the desired light distribution.
- at least one lighting module can be provided inside the housing of a headlamp in order to be able to produce any lighting function (for example flashing light, position / parking / parking light, daytime running light, cornering light, etc.).
- Automotive headlamps are increasingly employing semiconductor light sources (e.g., light emitting diodes, LEDs).
- the semiconductor light sources are also used for headlight functions, such as for producing low beam, high beam and / or fog light, so for illumination of the vehicle environment. This requires relatively powerful semiconductor light sources.
- semiconductor light sources In contrast to halogen lamps or gas discharge lamps, semiconductor light sources emit relatively cold light. The emitted light itself thus contains significantly less heat radiation components than a halogen lamp or gas discharge lamp. Nevertheless, losses also occur during the operation of semiconductor light sources. This means that part of the electrical energy used for operation is released as heat loss. Since the light of the semiconductor light sources hardly contains heat radiation components, this waste heat heats up the semiconductor chip itself. This is problematic because important properties of semiconductor light sources such as their luminous flux, color, forward voltage and lifetime are highly temperature dependent. The temperature of the semiconductor light sources must therefore be within narrow, fixed limits by a predetermined thermal operating point. In this case, the semiconductor light sources must be protected in particular against overheating.
- the maximum permeable chip temperature is currently between 125 ° C and 185 ° C, depending on the manufacturer. Exceeding the respective maximum temperature results in destruction of the semiconductor light source or at least a strong reduction in its service life. Since only a relatively small part of the electrical energy used is converted into light, LED headlamps have a loss of heat output that can reach values between 15 watts and 35 watts.
- cooling concepts In order to reliably dissipate these occurring in the chip of the semiconductor light sources loss heat outputs, cooling concepts are used, which provide in particular large-scale aluminum or copper cooling elements to absorb the heat loss and deliver over serving as a heat sink ribs or other devisvidveriesrnde structures to the environment.
- the cooling elements and the heat sinks in the prior art are Usually arranged within the headlight housing. Often, these cooling requirements are so high that normal convective cooling is no longer sufficient and a fan must be used to force a constant flow of cooling air inside the enclosure.
- a headlamp housing made of thermally conductive plastic.
- the plastic on additives such as metal or ceramic, which are such that they give the material provided with the additives plastic material a higher thermal conductivity.
- metallic structures are embedded in the plastic. The metal structures serve to conduct heat preferably in certain areas of the housing, in which a particularly efficient cooling can be achieved.
- a lighting device with a housing in which a bottom part is at least partially made as an injection molded part.
- the injection molding consists predominantly of a plastic which contains in particular mineral, ceramic, glassy or metallic particles.
- the thermal conductivity of the plastic material is so significantly increased, so that the heat generated in the interior of the housing can be dissipated through the bottom part.
- the headlight in one embodiment (see. Fig. 2G ) a heat pipe, which heat away from the LED chip leads to other areas inside the housing.
- the object of the present invention is to design and further develop a headlamp such that the dissipation of the heat from semiconductor light source chips can be made more efficient in a manner that is as simple as possible (without the use of current-consuming active elements) and effectively.
- a heat dissipation should be improved from the inside of the housing to the outside.
- the cooling device comprises a cooling element arranged in or on the cover, which dissipates heat generated by the at least one light source to the outside.
- the cooling element is designed such that it can absorb the heat well from the interior of the housing and then release it to the outside to the environment. In this case, it should be ensured that as little heat as possible remains in the housing interior, so that the semiconductor light sources can be operated in the permitted temperature range, preferably as far as possible below the permitted maximum temperature.
- the cooling element is preferably a passive element; no additional active coolants (eg fans or Peltier elements) are used. This means that the cooling element consumes no electrical energy.
- the arrangement of the cooling element in the region of the cover has the advantage that it is at least indirectly exposed to the wind, which ensures a particularly effective heat dissipation from the cooling element and thus for a particularly efficient cooling of the semiconductor light source or chips.
- cooling elements can be arranged in or on the cover.
- a cover usually includes a flat or slightly curved front and one of the outer edge of the front to the rear (ie, opposite to the direction of travel) protruding edge region.
- a preferred position of the cooling element is a region of a lower end of the cover.
- the cooling element when the headlamp is installed in the motor vehicle, the cooling element is arranged in the direction of travel of the motor vehicle, on the front side of the cover plate.
- the cooling element would thus be arranged on the forward in the direction of travel front of the headlight. It may be visible to the viewer from the outside or invisible, eg. Covered by other components of the vehicle, be arranged in or on the cover.
- the cooling element must be arranged in or on the cover so that it does not interfere with the light emission of the headlamp and the generation of the desired light distribution.
- the cooling element is arranged on an edge region of the cover plate projecting rearward from the outer edge of the front side.
- the edge region of the cover is black or otherwise dark or opaque. An arrangement of the cooling element in this area makes it barely or not at all visible to the viewer.
- the cooling element arranged in or on the cover pane is at least partially concealed by a bumper of the motor vehicle when the headlight is installed in the vehicle.
- a contamination of the cooling element is avoided while driving, whereby the heat radiation rate of the cooling element is maintained.
- the bumper should, however, be designed such that it allows a corresponding air supply to the cooling element both when the vehicle is stationary and when driving.
- the cooling device has a heat exchanger, which is arranged between the at least one light source and the cooling element. This transfers the heat generated during operation of the semiconductor light source particularly efficiently to the cooling element, where it can then be delivered to the environment outside the headlight housing.
- the heat exchanger has a metallic or ceramic core, which is coated with plastic.
- Such a design of the heat exchanger has the advantage that the heat exchanger can absorb or release heat at its free ends, but does not emit the heat on the way from one end to the other end into the housing.
- the heat exchanger may also include a heat pipe.
- Heat pipes are well known in the art.
- the heat pipe thus connects the heat source (semiconductor light source chip) with the heat sink (cooling element in or on the cover).
- the heat exchanger is concealed by arranged in the interior of the housing blinds or other design elements, so that the heat exchanger during View from the outside into the interior of the headlight is not visible to the viewer.
- the cooling element is introduced into the cover.
- the cover has a recess into which the cooling element is used as accurately as possible.
- the cooling element can absorb heat on a side facing the interior of the housing, for example by connecting a heat exchanger, and can release heat to the environment on an outwardly facing side. By driving wind while driving the vehicle cooling of the cooling element can be supported.
- a housing density must be guaranteed at all times. This means that the cooling element must be sealed in the recess of the cover accordingly, so that the interior of the housing is hermetically sealed to the outside.
- the cooling element is applied to the outside of the cover.
- the heat exchanger must penetrate the cover, which only requires a relatively small opening or recess in the cover. Any possible sealing problems can be minimized, especially since the cooling element covers and seals the opening in the cover from the outside, provided that it has a larger diameter than the heat exchanger. Again, the airflow while driving the vehicle can support the cooling of the cooling element.
- the cooling element is arranged on the inside of the cover.
- the cooling element is preferably designed as a heat radiator, wherein the heat radiation emitted by the cooling element is emitted in a targeted manner through the cover to the outside.
- the choice of the material of the cover plate for example, Makrolon
- the cover plate has a smooth outer surface in this embodiment.
- the cooling element is a separately formed from the cover element.
- the cooling element is characterized in particular in that it has a good heat absorption and a good heat emission characteristic and a good thermal conductivity.
- the cooling element additionally has a surface-enlarging structure, in particular cooling fins, cooling pins, etc., has. This further promotes heat dissipation to the environment.
- the cooling element is preferably made of metal, in particular aluminum.
- the cooling element is an integral part of the cover and by a limited area of the cover is formed.
- metal, graphite or ceramic particles can be introduced into the intended area in a plastic material of the cover plate, which improve the thermal conductivity of the plastic material in this area.
- the area of the cover pane produced in this way can be made transparent or at least semitransparent.
- the cooling element is therefore not separately formed from the cover element, but is integrated into it.
- the heat exchanger is connected directly to the said region of the cover. In order to achieve a better heat distribution over the area, the heat of the heat exchanger should be distributed to the available area of the area of the cover. For this purpose, the heat exchanger can be increased accordingly, for example in the connection area on the cover.
- the at least one light source of the headlamp preferably comprises at least one semiconductor light source, e.g. a light emitting diode (LED).
- LED light emitting diode
- FIG. 1 shows a motor vehicle 10, in particular a passenger car, which has a headlight 12 on the right and left in the front area.
- a headlight 12 could also be arranged on a truck or on a two-wheeler.
- the headlight 12 usually comprises a housing, preferably made of plastic, in which one or more light modules (in FIG. 1 not visible) are arranged to generate a desired light distribution on the road ahead of the motor vehicle.
- the headlamp 12 comprises a plurality of light modules, each of which generates different light distributions, for example low beam, high beam and / or fog light.
- the light distributions can also be variable, as for example in the case of dynamic cornering light, in adaptive headlight range control or in the case of a dimmed light distribution with a variable light-dark boundary.
- FIG. 2 shows a schematic representation of a first embodiment of the headlamp 12 in a side view.
- the headlight 12 comprises a housing 14 with a light exit opening, which is closed by a translucent cover 16.
- a light module 18 is arranged inside the housing 14.
- the light module 18 comprises a concave curved reflector 20, in whose focal point a semiconductor light source 22, preferably a light-emitting diode, is arranged.
- the reflector 20 is preferably designed as a half-shell reflector.
- the semiconductor light source 22 is arranged for electrical contacting on a printed circuit board 24 and emits light in the direction of the reflector 20, wherein the reflector 20 deflects the light in a light exit direction 26.
- the printed circuit board 24 is arranged on a heat-absorbing body 28, wherein the heat-absorbing body 28 is part of a cooling device 30.
- the heat-absorbing body 28 is preferably made of metal.
- a heat exchanger 32 is arranged in a recess of the heat-absorbing body 28 in a recess of the heat-absorbing body 28 .
- the heat exchanger 32 is rod-shaped or plate-shaped and preferably has a metallic or ceramic core 34, which is coated with plastic.
- the heat exchanger 32 could also comprise a heat pipe.
- the cooling device 30 essentially comprises the heat-absorbing body 28, the heat exchanger 32 and the cooling element 36.
- the cooling element 36 designed as a heat sink is preferably made of metal, for example of aluminum or Copper, made.
- the heat sink 36 preferably has cooling fins 38. Between the heat sink 36 and the inlet region on the cover 16, a sealant is applied (not visible), which serves to ensure that the interior of the housing 14 is hermetically sealed to the outside despite the recessed heat sink 36.
- the heat exchanger 32 provides a thermal connection between the heat-generating point of the headlamp 12, that is, from the semiconductor light source 22 disposed on the circuit board 24 to the heat-dissipating heat sink 36 to transfer the heat generated from the semiconductor light source 22 to the heat sink 36.
- the heat sink 36 may include an entire width of the cover 16 and is preferably in the lower region of the cover 16, ie to a bumper 40 of the motor vehicle 10 out, and / or in an edge region of the cover 16, respectively.
- the plastic layer surrounding the heat exchanger 32 prevents heat from being released into the interior of the housing 14 on the way from the heat-absorbing body 28 to the cooling body 36. When the motor vehicle 10 is traveling, a wind may assist the cooling of the heat sink 36 and thus the heat dissipation from the interior of the housing 14.
- the heat sink 36 may be obscured by the bumper 40 of the motor vehicle 10 to prevent fouling of the heat sink 36.
- the area of the heat sink 36 on the cover 16 is in FIG. 2 designated by the reference numeral 42.
- FIGS. 3 to 5 show three more ways of arranging the heat sink 36 on the cover 16. Dazu ist in die FIGS. 3 to 5 only the area 42 shown.
- the heat sink 36 is arranged completely on the outside of the cover 16.
- the cover 16 is broken only for the implementation of the heat exchanger 32.
- the region of the implementation of the heat exchanger 32 must be sealed by the cover 16 accordingly.
- the heat sink 36 may have cooling fins 38.
- the heat sink 36 on the inside of the cover 16, so in the interior of the housing 14, respectively.
- the heat sink 36 acts primarily as a heat radiator, which emits heat through the cover 16 to the outside.
- the cover 16 is formed flat and smooth in this embodiment to the outside.
- the cooling element is an integral part of the cover 16.
- the cooling element is formed by a region of the cover 16, in which in a plastic material of the cover metal, graphite or ceramic particles are introduced, which improve the thermal conductivity of the plastic material in this area.
- the region of the cover 16 thus formed may be transparent or at least semitransparent.
- the heat exchanger 32 is connected directly to the cooling element 36 of the cover 16.
- the heat exchanger 32 may have a heat conducting plate 44, whereby the heat of the heat exchanger 32 on the area. 6 is distributed substantially evenly.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012219162.3A DE102012219162A1 (de) | 2012-10-19 | 2012-10-19 | Kraftfahrzeugscheinwerfer mit Lichtquelle und einer Kühleinrichtung für die Lichtquelle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2722579A1 true EP2722579A1 (fr) | 2014-04-23 |
| EP2722579B1 EP2722579B1 (fr) | 2020-03-04 |
Family
ID=49230509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13184495.3A Active EP2722579B1 (fr) | 2012-10-19 | 2013-09-16 | Phare de véhicule automobile avec source de lumière et dispositif de refroidissement pour la source de lumière |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2722579B1 (fr) |
| DE (1) | DE102012219162A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4575306A1 (fr) * | 2023-12-19 | 2025-06-25 | Wuhan Lotus Cars Co., Ltd. | Dispositif d' éclairage pour véhicule |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015202358A1 (de) | 2015-02-10 | 2016-08-11 | Automotive Lighting Reutlingen Gmbh | Beleuchtungseinrichtung für ein Kraftfahrzeug |
| DE102017209003A1 (de) * | 2017-05-30 | 2018-12-06 | Bayerische Motoren Werke Aktiengesellschaft | Beleuchtungsvorrichtung für ein Kraftfahrzeug |
| DE102017117555A1 (de) | 2017-08-02 | 2019-02-07 | Automotive Lighting Reutlingen Gmbh | Scheinwerfer für ein Kraftfahrzeug |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1371901A2 (fr) | 2002-06-10 | 2003-12-17 | Lumileds Lighting US, LLC | Lampe avec source lumineuse DEL fixée axialement |
| WO2004055433A1 (fr) * | 2002-12-16 | 2004-07-01 | Daimlerchrysler Ag | Unite phare pour un vehicule automobile |
| EP1459934A2 (fr) * | 2003-03-17 | 2004-09-22 | DaimlerChrysler AG | Projecteur pour véhicules |
| EP1643188A1 (fr) * | 2004-09-29 | 2006-04-05 | Osram Opto Semiconductors GmbH | Arrangement de diodes électroluminiscentes avec des moyens de refroidissement et projecteur pour véhicule automobile |
| DE102006001947A1 (de) | 2005-09-12 | 2007-03-29 | Kompled Gmbh & Co. Kg | Heckleuchtenanordnung |
| US20070091632A1 (en) * | 2005-10-25 | 2007-04-26 | Visteon Global Technologies, Inc. | Convectively cooled headlamp assembly |
| WO2007087791A1 (fr) * | 2006-02-01 | 2007-08-09 | Osram Gesellschaft mit beschränkter Haftung | Phare de véhicule à moteur |
| US20080025038A1 (en) * | 2006-07-25 | 2008-01-31 | Industrial Technology Research Institute | Thermal module system for LED headlamp module |
| DE102007016442A1 (de) * | 2007-04-05 | 2008-10-09 | Volkswagen Ag | LED-Leuchte für ein Kraftfahrzeug |
| DE102010005534A1 (de) | 2010-01-23 | 2011-07-28 | Automotive Lighting Reutlingen GmbH, 72762 | Kraftfahrzeugbeleuchtungseinrichtung mit einem Kunststoffmaterial aufweisenden Gehäuse |
| DE102011011700A1 (de) * | 2011-02-18 | 2012-08-23 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | LED-Scheinwerfer, Kraftfahrzeug mit einem LED-Scheinwerfer und Verfahren zur Kühlung eines LED-Scheinwerfers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008003915A1 (de) * | 2008-01-10 | 2009-07-23 | Heinrich-Beck-Institut Gmbh | LED-Fernscheinwerfer |
-
2012
- 2012-10-19 DE DE102012219162.3A patent/DE102012219162A1/de not_active Withdrawn
-
2013
- 2013-09-16 EP EP13184495.3A patent/EP2722579B1/fr active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1371901A2 (fr) | 2002-06-10 | 2003-12-17 | Lumileds Lighting US, LLC | Lampe avec source lumineuse DEL fixée axialement |
| WO2004055433A1 (fr) * | 2002-12-16 | 2004-07-01 | Daimlerchrysler Ag | Unite phare pour un vehicule automobile |
| EP1459934A2 (fr) * | 2003-03-17 | 2004-09-22 | DaimlerChrysler AG | Projecteur pour véhicules |
| EP1643188A1 (fr) * | 2004-09-29 | 2006-04-05 | Osram Opto Semiconductors GmbH | Arrangement de diodes électroluminiscentes avec des moyens de refroidissement et projecteur pour véhicule automobile |
| DE102006001947A1 (de) | 2005-09-12 | 2007-03-29 | Kompled Gmbh & Co. Kg | Heckleuchtenanordnung |
| US20070091632A1 (en) * | 2005-10-25 | 2007-04-26 | Visteon Global Technologies, Inc. | Convectively cooled headlamp assembly |
| WO2007087791A1 (fr) * | 2006-02-01 | 2007-08-09 | Osram Gesellschaft mit beschränkter Haftung | Phare de véhicule à moteur |
| US20080025038A1 (en) * | 2006-07-25 | 2008-01-31 | Industrial Technology Research Institute | Thermal module system for LED headlamp module |
| DE102007016442A1 (de) * | 2007-04-05 | 2008-10-09 | Volkswagen Ag | LED-Leuchte für ein Kraftfahrzeug |
| DE102010005534A1 (de) | 2010-01-23 | 2011-07-28 | Automotive Lighting Reutlingen GmbH, 72762 | Kraftfahrzeugbeleuchtungseinrichtung mit einem Kunststoffmaterial aufweisenden Gehäuse |
| DE102011011700A1 (de) * | 2011-02-18 | 2012-08-23 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | LED-Scheinwerfer, Kraftfahrzeug mit einem LED-Scheinwerfer und Verfahren zur Kühlung eines LED-Scheinwerfers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4575306A1 (fr) * | 2023-12-19 | 2025-06-25 | Wuhan Lotus Cars Co., Ltd. | Dispositif d' éclairage pour véhicule |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012219162A1 (de) | 2014-05-08 |
| EP2722579B1 (fr) | 2020-03-04 |
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