EP2834552B1 - Illumination apparatus for a motor vehicle - Google Patents
Illumination apparatus for a motor vehicle Download PDFInfo
- Publication number
- EP2834552B1 EP2834552B1 EP13706251.9A EP13706251A EP2834552B1 EP 2834552 B1 EP2834552 B1 EP 2834552B1 EP 13706251 A EP13706251 A EP 13706251A EP 2834552 B1 EP2834552 B1 EP 2834552B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light source
- housing
- illumination device
- heat sink
- cooling
- 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.)
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Links
- 238000005286 illumination Methods 0.000 title claims description 13
- 238000001816 cooling Methods 0.000 claims description 39
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000003570 air Substances 0.000 description 35
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
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- 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
- F21S45/42—Forced cooling
- F21S45/43—Forced cooling using gas
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- 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
- F21S41/16—Laser light sources
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- 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
- F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
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- 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
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- 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
- F21S45/40—Cooling of lighting devices
- F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
Definitions
- the invention relates to a lighting device for a motor vehicle according to the preamble of claim 1.
- a lighting device for a motor vehicle which comprises LEDs as the light source.
- the heat generated by the LEDs is led to a heat dissipation element.
- the object of the invention is to provide an energy-efficient lighting device for a motor vehicle with a laser light source.
- the lighting device is intended for a motor vehicle, in particular a car and possibly also a truck. It comprises a light source of a number of laser diodes.
- the laser light source contains it a plurality of laser diodes, preferably between three and eight laser diodes. Nevertheless, only a single laser diode can be provided.
- laser diodes with a respective power of at least 1 W and preferably between 1.5 and 5 W are used.
- the lighting device further includes an optical device arranged in a housing for generating a predetermined light distribution from the light of the light source.
- the structure of such an optical device is known per se and may vary depending on the application.
- the optical device for generating the corresponding light distribution may comprise one or more reflectors (eg half-shell reflectors) and / or one or more lenses.
- the lighting device comprises a heat sink, which is designed or arranged such that it absorbs heat generated during operation of the light source substantially without the interposition of the interior air coming from the interior of the housing and the absorbed heat to the outside air coming from outside the housing again substantially without the interposition of the internal air gives off.
- the heat sink thus ensures heat transfer from the light source to the outside air without the involvement of the inside air, which implies that the heat transfer takes place without mixing the outside air with the inside air.
- the term heat sink is to be understood here and in the following as meaning broadly and may include a passive cooling device and possibly also an active cooling device (for example fan, Peltier element) or combinations of such cooling devices. Compared with the prior art, according to the invention, the cooling capacity of a conventional cooling device can be increased by the use of outside air.
- the invention is based on the idea that a much better efficiency in the operation of the lighting device can be achieved via outside air as a cooling medium for the laser light source. It is also ensured that the outside air is not passed directly into the interior of the housing, because this would lead to an undesirable contamination of the sensitive optical surfaces of the optical device.
- the invention has particular advantages for a lighting device in which the light source is arranged inside the housing, since in this case the ambient temperature is very high and thus the cooling of the laser diodes of the light source is particularly important.
- the heat sink a (passive) heat sink, for. made of metal or another good heat-conducting material, on which the heat generated during operation of the light source is dissipated.
- the heat sink preferably comprises surface-enlarging elements, in particular fins and / or ribs and / or pins.
- the heat sink may further be configured at least partially as a solid body and / or at least partially as a hollow body.
- the light source is located on the heat sink, i. there is a direct contact between the light source and the heat sink for the transmission of thermal energy.
- At least one cooling channel separated from the inner air is guided through the heat sink by the heat sink for the purpose of transporting outside air through the heat sink.
- the heat sink thus comprises inside one or more passages for transporting the outside air.
- the heat sink is arranged entirely inside the housing of the lighting device. Nevertheless, it is also possible to design the heat sink such that it is at least partially disposed outside the housing.
- a thermal insulation is provided in a region of the outside of the heat sink and / or the cooling channel, at which no heat transfer between the light source and heat sink and / or cooling channel takes place. In this way it is prevented that in addition hot ambient air of the lighting device whose heat output is not from the light source, this heat sink or cooling channel thermally loaded.
- a fan for supplying outside air to the heat sink is provided, wherein the fan is preferably arranged outside of the housing, so that good outdoor air can be passed to the heat sink.
- the fan is provided in the cooling channel.
- the fan transports cooler air from a cooler point of the motor vehicle, in particular by means of a hose or air duct.
- the heat sink used in the lighting device may also include a so-called.
- Heatpipe which is also referred to as a heat pipe.
- the functional principle of heatpipes is known per se.
- a heat pipe is a heat exchanger that uses heat of vaporization a substance allows efficient heat transfer.
- the light source is arranged on the heat pipe, ie the light source has a direct contact with the heat pipe.
- the heat generated during operation of the light source is dissipated via the heat pipe to an at least partially disposed outside of the housing heat sink, which may possibly correspond to the above-described heat sink. Due to the arrangement of the heat sink outside the housing, a cooling of the same is achieved by outside air, without the outside air is guided into the interior of the housing.
- monochromatic light is generated with the laser light source, wherein a conversion element for converting the light into white light is provided.
- conversion elements are known per se.
- a phosphorous conversion element of nitride-phosphorus or oxyditride-phosphorus or cerium-doped YAG phosphorus can be used to generate white light.
- the lighting device comprises a headlight.
- a headlight is characterized by the fact that it actively illuminates the surroundings of the vehicle.
- the lighting device according to the invention may also include a signal light, which is characterized in that it is used only for signaling to other road users.
- the illumination device is designed such that a low-beam light characteristic can be generated during operation as a predetermined light distribution.
- the lighting device can also be configured such that it generates a high-beam characteristic in operation as a predetermined light distribution.
- the light source and the optical device are arranged movable and in particular pivotable or rotatable in the housing of the lighting device. As a result, functionalities such as cornering light, adaptive cornering light and the like can be realized.
- the invention further relates to a motor vehicle, which comprises one or more of the lighting devices according to the invention.
- FIG. 1 shows a schematic representation of an embodiment of the lighting device according to the invention in the form of a headlight.
- the headlight 1 of the Fig. 1 is installed in a (not shown) motor vehicle in the front area and comprises a housing 3, in the interior of which a laser light source 2 and an optical device 4 is provided.
- the optical device is only schematically indicated as a lens and serves to generate from the light of the light source 2, a predetermined light distribution according to the functionality of the headlamp.
- a parallel light distribution is generated from the substantially point-shaped laser light source 2, which can represent, for example, a high-beam characteristic.
- the course of the light rays is indicated by corresponding arrows P.
- the laser light source 2 comprises a number of laser diodes, which can be used compared to LEDs only up to a reduced housing temperature, as already mentioned above.
- a heat sink in the form of an internally ventilated heat sink 5 is used, on the outside of which the laser light source 2 is arranged so that it is in direct contact with the heat sink.
- the heat sink is a hollow body, which consists of a good heat-conducting material and in particular of metal, in order to achieve a good heat transfer from the laser light source 2 to the heat sink.
- a cooling channel for efficient cooling, in the embodiment of the Fig. 1 passed through the cooling body 5, a cooling channel, the lower and upper end protrude from the housing 3 and are designated by the reference numeral 6.
- the cooling channel is separated from the interior of the housing 3, so that it is ensured that the outside air used for cooling does not come into contact with the elements in the interior of the housing, whereby contamination of the laser light source or the sensitive optical elements of the optical device. 5 is prevented.
- a schematically indicated fan 7 is provided in the cooling channel 6, which is arranged outside of the housing 3 of the headlamp. This fan generates the air flow according to the arrows P '. If necessary, the fan can also assume the function of a compressor and lead to a further cooling by a relaxation of the air in the interior of the heat sink 5.
- surface-enlarging elements in particular in the form of lamellae or ribs or pins, are preferably provided in order to achieve good heat emission to the outside air guided in the cooling duct 6.
- the outside of the heat sink is thermally insulated in the area where there is no contact with the laser light source 2, thereby avoiding that heat given off to the outside air is again transmitted to the interior of the spotlight.
- appropriate mechanical means may be provided to allow a rotation or pivoting of the laser light source 2 and the optical device 4 within the housing 3, and thereby implement functionalities such as cornering light or adaptive cornering light.
- a mechanism (not shown) is provided which allows the rotation of the heat sink together with the laser light source.
- a flexible hose connection between the headlight housing 3 and internal cooler 5 can be used for this purpose.
- a heat pipe or a heat-conducting or metallic block can be used for cooling the laser light source. At one end of the heat pipe or the block while the laser light source is provided, and the other end of the heat pipe or the block leads out of the housing of the headlamp and is thus cooled by outside air.
- the embodiment described above has a number of advantages.
- cooling of the laser light source to the permitted operating temperature is achieved in a simple manner by outside air.
- efficiency of the lighting device is improved.
- a direct exchange of cold, possibly polluted outside air with the hot, pure internal air in the housing of the lighting device is avoided. Such an exchange would pollute the sensitive optical elements inside the lighting device and thus lead to an impairment of the operation of the lighting device.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Description
Die Erfindung betrifft eine Beleuchtungsvorrichtung für ein Kraftfahrzeug gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a lighting device for a motor vehicle according to the preamble of
Im Bereich der Kraftfahrzeugtechnik kommen heutzutage vermehrt Beleuchtungsvorrichtungen basierend auf LEDs bzw. Laserdioden zum Einsatz. Bei der Verwendung von Laserdioden besteht das Problem, dass diese nur bis zu um mindestens 20° C niedrigere Gehäusetemperaturen als LEDs verwendet werden können, jedoch im Betrieb der Beleuchtungsvorrichtung wesentlich höhere Temperaturen auftreten. Insbesondere kann die Innenluft einer Beleuchtungsvorrichtung in typischen Anwendungssituationen eine Temperatur von 100 °C aufweisen. Demzufolge müssen bei der Verwendung von Laserlichtquellen aktive Kühleinrichtungen in der Form von Wärmepumpen, wie z.B. Peltier-Elemente, vorgesehen werden, um die Innenluft der Beleuchtungsvorrichtung auf eine Betriebstemperatur für Laserdioden abzukühlen: Wärmepumpen haben jedoch den Nachteil, dass sie einen geringen Wirkungsgrad aufweisen.In the field of automotive technology nowadays increasingly lighting devices based on LEDs or laser diodes are used. The problem with the use of laser diodes is that they can only be used up to at least 20 ° C. lower housing temperatures than LEDs, but that significantly higher temperatures occur during operation of the lighting device. In particular, the internal air of a lighting device may have a temperature of 100 ° C. in typical application situations. Consequently, when using laser light sources, active cooling means in the form of heat pumps, such as e.g. Peltier elements are provided to cool the internal air of the lighting device to an operating temperature for laser diodes: However, heat pumps have the disadvantage that they have a low efficiency.
Die Druckschrift
In der Druckschrift
Aufgabe der Erfindung ist es, eine energieeffiziente Beleuchtungsvorrichtung für ein Kraftfahrzeug mit einer Laserlichtquelle zu schaffen.The object of the invention is to provide an energy-efficient lighting device for a motor vehicle with a laser light source.
Diese Aufgabe wird durch die Beleuchtungsvorrichtung gemäß Patentanspruch 1 gelöst. Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen definiert.This object is achieved by the lighting device according to
Die erfindungsgemäße Beleuchtungsvorrichtung ist für ein Kraftfahrzeug, insbesondere einen PKW und gegebenenfalls auch einen LKW, vorgesehen. Sie umfasst eine Lichtquelle aus einer Anzahl von Laserdioden. Insbesondere enthält die Laserlichtquelle dabei mehrere Laserdioden, vorzugsweise zwischen drei und acht Laserdioden. Nichtsdestotrotz kann auch lediglich eine einzelne Laserdiode vorgesehen sein. Insbesondere kommen Laserdioden mit einer jeweiligen Leistung von mindestens 1 W und vorzugsweise zwischen 1,5 und 5 W zum Einsatz. Die Beleuchtungsvorrichtung beinhaltet ferner eine in einem Gehäuse angeordnete optische Einrichtung zur Erzeugung einer vorgegebenen Lichtverteilung aus dem Licht der Lichtquelle. Der Aufbau einer solchen optischen Einrichtung ist dabei an sich bekannt und kann je nach Anwendungsfall unterschiedlich sein. Insbesondere kann die optische Einrichtung zur Erzeugung der entsprechenden Lichtverteilung einen oder mehrere Reflektoren (z.B. Halbschalenreflektoren) und/oder eine oder mehrere Linsen umfassen.The lighting device according to the invention is intended for a motor vehicle, in particular a car and possibly also a truck. It comprises a light source of a number of laser diodes. In particular, the laser light source contains it a plurality of laser diodes, preferably between three and eight laser diodes. Nevertheless, only a single laser diode can be provided. In particular, laser diodes with a respective power of at least 1 W and preferably between 1.5 and 5 W are used. The lighting device further includes an optical device arranged in a housing for generating a predetermined light distribution from the light of the light source. The structure of such an optical device is known per se and may vary depending on the application. In particular, the optical device for generating the corresponding light distribution may comprise one or more reflectors (eg half-shell reflectors) and / or one or more lenses.
Die Beleuchtungsvorrichtung umfasst eine Wärmesenke, welche derart ausgestaltet bzw. angeordnet ist, dass sie im Betrieb der Lichtquelle generierte Wärme im Wesentlichen ohne Zwischenschaltung der aus dem Inneren des Gehäuses stammenden Innenluft aufnimmt und die aufgenommene Wärme an die von außerhalb des Gehäuses stammende Außenluft wiederum im Wesentlichen ohne Zwischenschaltung der Innenluft abgibt. Die Wärmesenke gewährleistet somit einen Wärmeübertrag von der Lichtquelle zu der Außenluft ohne Beteiligung der Innenluft, was impliziert, dass der Wärmeübertrag ohne Vermengung der Außenluft mit der Innenluft stattfindet. Der Begriff der Wärmesenke ist hier und im Folgenden weit zu verstehen und kann eine passive Kühleinrichtung und ggf. auch eine aktive Kühleinrichtung (z.B. Lüfter, Peltier-Element) bzw. Kombinationen solcher Kühleinrichtungen umfassen. Im Vergleich zum Stand der Technik kann erfindungsgemäß die Kühlleistung einer herkömmlichen Kühleinrichtung durch die Verwendung von Außenluft erhöht werden.The lighting device comprises a heat sink, which is designed or arranged such that it absorbs heat generated during operation of the light source substantially without the interposition of the interior air coming from the interior of the housing and the absorbed heat to the outside air coming from outside the housing again substantially without the interposition of the internal air gives off. The heat sink thus ensures heat transfer from the light source to the outside air without the involvement of the inside air, which implies that the heat transfer takes place without mixing the outside air with the inside air. The term heat sink is to be understood here and in the following as meaning broadly and may include a passive cooling device and possibly also an active cooling device (for example fan, Peltier element) or combinations of such cooling devices. Compared with the prior art, according to the invention, the cooling capacity of a conventional cooling device can be increased by the use of outside air.
Die Erfindung beruht auf der Idee, dass über Außenluft als Kühlmedium für die Laserlichtquelle ein wesentlich besserer Wirkungsgrad im Betrieb der Beleuchtungsvorrichtung erreicht werden kann. Dabei wird auch gewährleistet, dass die Außenluft nicht direkt in das Innere des Gehäuses geleitet wird, denn dies würde zu einer unerwünschten Verschmutzung der empfindlichen optischen Flächen der optischen Einrichtung führen. Die Erfindung hat dabei besondere Vorteile für eine Beleuchtungsvorrichtung, bei der die Lichtquelle im Inneren des Gehäuses angeordnet ist, da in diesem Fall die Umgebungstemperatur sehr hoch ist und damit die Kühlung der Laserdioden der Lichtquelle besonders wichtig ist.The invention is based on the idea that a much better efficiency in the operation of the lighting device can be achieved via outside air as a cooling medium for the laser light source. It is also ensured that the outside air is not passed directly into the interior of the housing, because this would lead to an undesirable contamination of the sensitive optical surfaces of the optical device. The invention has particular advantages for a lighting device in which the light source is arranged inside the housing, since in this case the ambient temperature is very high and thus the cooling of the laser diodes of the light source is particularly important.
Ein besonders hoher Wirkungsgrad wird erfindungsgemäß dadurch erreicht, dass die Wärmesenke einen (passiven) Kühlkörper z.B. aus Metall oder einem anderen gut wärmeleitenden Material, umfasst, an dem die im Betrieb der Lichtquelle generierte Wärme abgeführt wird. Vorzugsweise umfasst der Kühlkörper dabei oberflächenvergrößernde Elemente, insbesondere Lamellen und/oder Rippen und/oder Stifte. Der Kühlkörper kann ferner zumindest teilweise als Vollkörper und/oder zumindest teilweise als Hohlkörper ausgestaltet sein. Zum effizienten Wärmeübertrag ist die Lichtquelle am Kühlkörper angeordnet, d.h. es besteht ein direkter Kontakt zwischen Lichtquelle und Kühlkörper zur Übertragung von thermischer Energie.A particularly high efficiency is inventively achieved in that the heat sink a (passive) heat sink, for. made of metal or another good heat-conducting material, on which the heat generated during operation of the light source is dissipated. The heat sink preferably comprises surface-enlarging elements, in particular fins and / or ribs and / or pins. The heat sink may further be configured at least partially as a solid body and / or at least partially as a hollow body. For efficient heat transfer, the light source is located on the heat sink, i. there is a direct contact between the light source and the heat sink for the transmission of thermal energy.
Erfindungsgemäß ist durch den Kühlkörper zumindest ein von der Innenluft separierter Kühlkanal zum Transport von Außenluft durch den Kühlkörper geführt. Der Kühlkörper umfasst somit im Inneren eine oder mehrere Durchführungen zum Transport der Außenluft. Hierdurch wird auf einfache Weise die Trennung der Außenluftzufuhr von der Luft im Inneren des Gehäuses erreicht.According to the invention, at least one cooling channel separated from the inner air is guided through the heat sink by the heat sink for the purpose of transporting outside air through the heat sink. The heat sink thus comprises inside one or more passages for transporting the outside air. As a result, the separation of the external air supply is achieved by the air in the interior of the housing in a simple manner.
Erfindungsgemäß ist der Kühlkörper ganz im Inneren des Gehäuses der Beleuchtungsvorrichtung angeordnet. Nichtsdestotrotz besteht auch die Möglichkeit, den Kühlkörper derart auszuführen, dass er zumindest teilweise außerhalb des Gehäuses angeordnet ist.According to the invention, the heat sink is arranged entirely inside the housing of the lighting device. Nevertheless, it is also possible to design the heat sink such that it is at least partially disposed outside the housing.
Erfindungsgemäß ist in einem Bereich der Außenseite des Kühlkörpers und/oder des Kühlkanals, an dem kein Wärmeübertrag zwischen Lichtquelle und Kühlkörper und/oder Kühlkanal erfolgt, eine thermische Isolation vorgesehen. Auf diese Weise wird verhindert, dass zusätzlich heiße Umgebungsluft der Beleuchtungsvorrichtung, deren Wärmeleistung nicht von der Lichtquelle stammt, auch diesen Kühlkörper bzw. Kühlkanal thermisch belastet.According to the invention, a thermal insulation is provided in a region of the outside of the heat sink and / or the cooling channel, at which no heat transfer between the light source and heat sink and / or cooling channel takes place. In this way it is prevented that in addition hot ambient air of the lighting device whose heat output is not from the light source, this heat sink or cooling channel thermally loaded.
In einer Ausgestaltung der erfindungsgemäßen Beleuchtungsvorrichtung ist ein Lüfter zur Zufuhr von Außenluft zur Wärmesenke vorgesehen, wobei der Lüfter vorzugsweise au-ßerhalb des Gehäuses angeordnet ist, so dass hierüber gut Außenluft zur Wärmesenke geführt werden kann. Vorzugsweise ist der Lüfter im Kühlkanal vorgesehen. Vorzugsweise transportiert der Lüfter dabei kühlere Luft von einer kühleren Stelle des Kraftfahrzeugs heran, insbesondere mittels eines Schlauchs bzw. Luftkanals.In one embodiment of the lighting device according to the invention, a fan for supplying outside air to the heat sink is provided, wherein the fan is preferably arranged outside of the housing, so that good outdoor air can be passed to the heat sink. Preferably, the fan is provided in the cooling channel. Preferably, the fan transports cooler air from a cooler point of the motor vehicle, in particular by means of a hose or air duct.
Zusätzlich zu einem Kühlkörper kann die in der Beleuchtungsvorrichtung verwendete Wärmesenke auch eine sog. Heatpipe umfassen, welche auch als Wärmerohr bezeichnet wird. Das Funktionsprinzip von Heatpipes ist dabei an sich bekannt. Eine Heatpipe stellt einen Wärmeübertrager dar, der unter Nutzung von Verdampfungswärme eines Stoffes einen effizienten Wärmetransport ermöglicht. In einer bevorzugten Variante ist die Lichtquelle an der Heatpipe angeordnet, d.h. die Lichtquelle hat einen direkten Kontakt zur Heatpipe. In einer weiteren Ausgestaltung wird die im Betrieb der Lichtquelle generierte Wärme über die Heatpipe an einen zumindest teilweise außerhalb des Gehäuses angeordneten Kühlkörper abgeführt, der ggf. dem oben beschriebenen Kühlkörper entsprechen kann. Aufgrund der Anordnung des Kühlkörpers außerhalb des Gehäuses wird eine Kühlung desselben durch Außenluft erreicht, ohne dass die Außenluft in das Innere des Gehäuses geführt wird.In addition to a heat sink, the heat sink used in the lighting device may also include a so-called. Heatpipe, which is also referred to as a heat pipe. The functional principle of heatpipes is known per se. A heat pipe is a heat exchanger that uses heat of vaporization a substance allows efficient heat transfer. In a preferred variant, the light source is arranged on the heat pipe, ie the light source has a direct contact with the heat pipe. In a further embodiment, the heat generated during operation of the light source is dissipated via the heat pipe to an at least partially disposed outside of the housing heat sink, which may possibly correspond to the above-described heat sink. Due to the arrangement of the heat sink outside the housing, a cooling of the same is achieved by outside air, without the outside air is guided into the interior of the housing.
In einer bevorzugten Ausführungsform der Erfindung wird mit der Laserlichtquelle monochromatisches Licht erzeugt, wobei ein Konvertierungselement zur Wandlung des Lichts in Weißlicht vorgesehen ist. Solche Konvertierungselemente sind an sich bekannt. Beispielsweise kann bei blauen/violetten Laserdioden mit einer Emissionswellenlänge von 450 nm/405 nm ein Phosphorkonvertierungselement aus Nitrid-Phosphor oder Oxidnitrid-Phosphor oder Cerium-dotiertem YAG-Phosphor zur Generierung von Weißlicht verwendet werden.In a preferred embodiment of the invention, monochromatic light is generated with the laser light source, wherein a conversion element for converting the light into white light is provided. Such conversion elements are known per se. For example, in blue / violet laser diodes having an emission wavelength of 450 nm / 405 nm, a phosphorous conversion element of nitride-phosphorus or oxyditride-phosphorus or cerium-doped YAG phosphorus can be used to generate white light.
Je nach Anwendungsfall kann die erfindungsgemäße Beleuchtungsvorrichtung verschiedene Funktionalitäten übernehmen. In einer Ausführungsform umfasst die Beleuchtungsvorrichtung einen Scheinwerfer. Ein Scheinwerfer zeichnet sich dadurch aus, dass er aktiv die Umgebung des Fahrzeugs ausleuchtet. Gegebenenfalls kann die erfindungsgemäße Beleuchtungsvorrichtung auch eine Signalleuchte umfassen, welche sich dadurch auszeichnet, dass sie lediglich zur Signalgebung für andere Verkehrsteilnehmer dient. In einer bevorzugten Variante ist die Beleuchtungsvorrichtung derart ausgestaltet, dass im Betrieb als vorbestimmte Lichtverteilung eine Abblendlichtcharakteristik generiert werden kann. Gegebenenfalls kann die Beleuchtungsvorrichtung auch derart ausgestaltet sein, dass sie im Betrieb als vorgegebene Lichtverteilung eine Fernlichtcharakteristik generiert. Ferner besteht auch die Möglichkeit, dass die Lichtquelle und die optische Einrichtung bewegbar und insbesondere verschwenkbar bzw. verdrehbar im Gehäuse der Beleuchtungsvorrichtung angeordnet sind. Hierdurch können Funktionalitäten wie Abbiegelicht, adaptives Kurvenlicht und dergleichen realisiert werden.Depending on the application, the lighting device according to the invention can take on different functionalities. In one embodiment, the lighting device comprises a headlight. A headlight is characterized by the fact that it actively illuminates the surroundings of the vehicle. Optionally, the lighting device according to the invention may also include a signal light, which is characterized in that it is used only for signaling to other road users. In a preferred variant, the illumination device is designed such that a low-beam light characteristic can be generated during operation as a predetermined light distribution. Optionally, the lighting device can also be configured such that it generates a high-beam characteristic in operation as a predetermined light distribution. Furthermore, there is also the possibility that the light source and the optical device are arranged movable and in particular pivotable or rotatable in the housing of the lighting device. As a result, functionalities such as cornering light, adaptive cornering light and the like can be realized.
Neben der oben beschriebenen Beleuchtungsvorrichtung betrifft die Erfindung ferner ein Kraftfahrzeug, welches eine oder mehrere der erfindungsgemäßen Beleuchtungsvorrichtungen umfasst.In addition to the lighting device described above, the invention further relates to a motor vehicle, which comprises one or more of the lighting devices according to the invention.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der beigefügten
Der Scheinwerfer 1 der
Die Laserlichtquelle 2 umfasst eine Anzahl von Laserdioden, welche im Vergleich zu LEDs nur bis zu einer verminderten Gehäusetemperatur eingesetzt werden können, wie bereits oben erwähnt wurde. Zur effizienten Kühlung der Laserdioden wird deshalb eine Wärmesenke in der Form eines innenbelüfteten Kühlkörpers 5 verwendet, an dessen Au-ßenseite die Laserlichtquelle 2 angeordnet ist, so dass diese unmittelbar in Kontakt mit dem Kühlkörper ist. Der Kühlkörper ist ein Hohlkörper, der aus einem gut wärmeleitenden Material und insbesondere aus Metall besteht, um hierdurch einen guten Wärmeübertrag von der Laserlichtquelle 2 zum Kühlkörper zu erreichen. Zur effizienten Kühlung wird in der Ausführungsform der
Um einen effizienten Abtransport der Wärme der Laserlichtquelle über die Außenluft zu erreichen, ist in der Ausführungsform der
Gegebenenfalls können in der Ausführungsform der
Die im Vorangegangenen beschriebene Ausführungsform weist eine Reihe von Vorteilen auf. Insbesondere wird in einer Beleuchtungsvorrichtung eines Kraftfahrzeugs eine Kühlung der Laserlichtquelle auf die erlaubte Betriebstemperatur auf einfache Weise durch Außenluft erreicht. Hierdurch wird der Wirkungsgrad der Beleuchtungsvorrichtung verbessert. Darüber hinaus wird ein direkter Austausch der kalten, eventuell verschmutzten Außenluft mit der heißen, reinen Innenluft im Gehäuse der Beleuchtungsvorrichtung vermieden. Ein solcher Austausch würde zur Verschmutzung der empfindlichen optischen Elemente im Inneren der Beleuchtungsvorrichtung und damit zu einer Beeinträchtigung des Betriebs der Beleuchtungsvorrichtung führen.The embodiment described above has a number of advantages. In particular, in a lighting device of a motor vehicle, cooling of the laser light source to the permitted operating temperature is achieved in a simple manner by outside air. As a result, the efficiency of the lighting device is improved. In addition, a direct exchange of cold, possibly polluted outside air with the hot, pure internal air in the housing of the lighting device is avoided. Such an exchange would pollute the sensitive optical elements inside the lighting device and thus lead to an impairment of the operation of the lighting device.
- 11
- Beleuchtungsvorrichtunglighting device
- 22
- LaserlichtquelleLaser light source
- 33
- Gehäusecasing
- 44
- optische Einrichtungoptical device
- 55
- Kühlkörperheatsink
- 66
- Kühlkanalcooling channel
- 77
- LüfterFan
- P, P'P, P '
- Pfeilearrows
Claims (10)
- An illumination device for a motor vehicle, comprising a light source (2) arranged in the interior of a housing (3) and comprising a number of diodes, and also an optical means (4), arranged in the housing (3), for producing a specified light distribution (P) from the light of the light source (2), wherein a heat sink (5) is provided which is configured such that it absorbs heat generated in operation of the light source (2) substantially without the interposition of the internal air coming from the interior of the housing and emits the absorbed heat to the external air coming from outside the housing (3) substantially without the interposition of the internal air, wherein the heat sink (5) comprises a cooling body arranged in the interior of the housing (3), on which body the light source (2) is arranged and on which heat generated in operation of the light source (2) is dissipated, wherein at least one cooling duct (6), which is separated from the internal air, for transporting external air through the cooling body is passed through the cooling body,
characterised in that the diodes are laser diodes, and thermal insulation is provided in a region of the outside of the cooling body (5) and/or of the cooling duct (6) at which no heat transfer between the light source (2) and cooling body and/or cooling duct (6) occurs. - An illumination device according to Claim 1, characterised in that the cooling body comprises lamellae and/or ribs and/or pins, and/or is at least partially a solid body and/or at least partially a hollow body.
- An illumination device according to one of the preceding claims, characterised in that a fan (7) for supplying external air to the heat sink (5) is provided, the fan (7) preferably being arranged outside the housing (3).
- An illumination device according to Claim 3, characterised in that the fan (7) is provided in the cooling duct (6), the fan (7) preferably transporting up cooler air from a cooler point of the motor vehicle.
- An illumination device according to one of the preceding claims, characterised in that the heat sink (5) comprises a heatpipe.
- An illumination device according to Claim 5, characterised in that the light source (2) is arranged on the heatpipe.
- An illumination device according to Claim 5 or Claim 6, characterised in that the heat generated in operation of the light source (2) is dissipated via the heatpipe to a cooling body arranged at least partially outside the housing (3).
- An illumination device according to one of the preceding claims, characterised in that the light source (2) produces monochromatic light and a converting element for converting the light from the light source (2) into white light is provided.
- An illumination device according to one of the preceding claims, characterised in that the illumination device (1) comprises an indicator light and/or a headlight.
- A motor vehicle, comprising one or more illumination devices (1) according to one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012205434A DE102012205434A1 (en) | 2012-04-03 | 2012-04-03 | Lighting device for a motor vehicle |
PCT/EP2013/053681 WO2013149764A1 (en) | 2012-04-03 | 2013-02-25 | Illumination apparatus for a motor vehicle |
Publications (2)
Publication Number | Publication Date |
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EP2834552A1 EP2834552A1 (en) | 2015-02-11 |
EP2834552B1 true EP2834552B1 (en) | 2019-06-19 |
Family
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Application Number | Title | Priority Date | Filing Date |
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EP13706251.9A Active EP2834552B1 (en) | 2012-04-03 | 2013-02-25 | Illumination apparatus for a motor vehicle |
Country Status (3)
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EP (1) | EP2834552B1 (en) |
DE (1) | DE102012205434A1 (en) |
WO (1) | WO2013149764A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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FR3046660B1 (en) * | 2015-11-27 | 2022-01-21 | Valeo Vision | MOTOR VEHICLE HEADLAMP LIGHTING MODULE AND ASSOCIATED HEADLAMP |
DE102016000978A1 (en) * | 2016-01-29 | 2017-08-03 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | headlamp device |
FR3048487B1 (en) * | 2016-03-02 | 2019-05-24 | Valeo Vision | LIGHTING DEVICE FOR A MOTOR VEHICLE COMPRISING COOLING LIGHT MODULES USING A GENERATOR OF AN AIR FLOW |
DE102016005936B4 (en) * | 2016-05-14 | 2018-04-26 | Audi Ag | Lighting device for a motor vehicle, motor vehicle and method for cooling a lighting device for a motor vehicle |
US10066801B1 (en) * | 2017-10-04 | 2018-09-04 | Osram Sylvania Inc. | Vehicle lamp reflector having ventilation channel adjacent lamp capsule |
DE102020128555A1 (en) | 2020-10-30 | 2022-05-05 | Bayerische Motoren Werke Aktiengesellschaft | Lighting device for a motor vehicle |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004127782A (en) * | 2002-10-04 | 2004-04-22 | Ichikoh Ind Ltd | Vehicle lamp and lighting device |
JP4265560B2 (en) * | 2005-03-31 | 2009-05-20 | 市光工業株式会社 | Vehicle lighting |
JP4527024B2 (en) * | 2005-07-28 | 2010-08-18 | 株式会社小糸製作所 | Vehicle lighting |
US7427152B2 (en) * | 2005-12-05 | 2008-09-23 | Visteon Global Technologies, Inc. | Headlamp assembly with integrated housing and heat sink |
WO2008043206A1 (en) * | 2006-10-10 | 2008-04-17 | Jen-Shyan Chen | A semiconductor light-emitting module |
DE102006052220A1 (en) * | 2006-11-06 | 2008-05-08 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Motor vehicle headlight |
DE102007028301A1 (en) * | 2007-06-20 | 2007-12-13 | Daimlerchrysler Ag | Vehicle headlight has housing and semiconductor light source, which is arranged in housing and is thermally connected with heat sink by heat pipe |
SI22617B (en) * | 2007-10-12 | 2014-12-31 | Hella Saturnus Slovenija, Proizvodnja Svetlobne Opreme Za Motorna In Druga Vozila, D.O.O. | Illumnant, particular for motor vehicles |
KR20110137993A (en) * | 2010-06-18 | 2011-12-26 | 현대자동차주식회사 | Heat radiating structure of led head lamp |
-
2012
- 2012-04-03 DE DE102012205434A patent/DE102012205434A1/en not_active Withdrawn
-
2013
- 2013-02-25 WO PCT/EP2013/053681 patent/WO2013149764A1/en active Application Filing
- 2013-02-25 EP EP13706251.9A patent/EP2834552B1/en active Active
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EP2834552A1 (en) | 2015-02-11 |
DE102012205434A1 (en) | 2013-10-10 |
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