EP1914472B1 - Illumination device for vehicles - Google Patents

Illumination device for vehicles Download PDF

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Publication number
EP1914472B1
EP1914472B1 EP07117934A EP07117934A EP1914472B1 EP 1914472 B1 EP1914472 B1 EP 1914472B1 EP 07117934 A EP07117934 A EP 07117934A EP 07117934 A EP07117934 A EP 07117934A EP 1914472 B1 EP1914472 B1 EP 1914472B1
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EP
European Patent Office
Prior art keywords
air flow
light sources
cooling element
cooling
lighting apparatus
Prior art date
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Active
Application number
EP07117934A
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German (de)
French (fr)
Other versions
EP1914472A1 (en
Inventor
Martin WÜLLER
Guido Buthe
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella KGaA Huek and Co
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Publication date
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Publication of EP1914472A1 publication Critical patent/EP1914472A1/en
Application granted granted Critical
Publication of EP1914472B1 publication Critical patent/EP1914472B1/en
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Classifications

    • 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
    • F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • 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
    • 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
    • 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
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • 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 invention relates to a lighting device for vehicles according to the preamble of patent claim 1.
  • a lighting device for vehicles which provides on the one hand a light source arrangement with a plurality of light sources and on the other a heat dissipation arrangement for the exchange of heat between the light source arrangement and an air flow.
  • the heat dissipation arrangement is associated with the light source arrangement and has a cooling element with cooling surfaces along which air guide channels are formed.
  • the cooling element is designed as a heat sink and connects directly to a light source of the light source arrangement.
  • the cooling surfaces of the cooling element are shaped such that the air flow is guided substantially in the direction of a light emission direction of the light sources, so that the air flow can be used to keep a lens of the lighting device ice and fog free.
  • the heat dissipation arrangement has a heat exchanger which effects a cooling of the air flow. Compliance with the operating temperature of the light sources is thus effected substantially by tempering the air flow.
  • a lighting device for vehicles which provides a light source arrangement with a light source and a heat dissipation arrangement with a heat sink.
  • the heat sink is directly associated with the light source, so that the cooling of the light source is made possible by a targeted air flow.
  • the heat sink is in each case assigned to a light source.
  • an illumination device for vehicles which has, on the one hand, a light source arrangement with a plurality of light sources arranged in an extension plane and, on the other hand, a heat dissipation arrangement with a cooling element for exchanging heat between the light source arrangement and an air flow.
  • the cooling element extends at the back of the light source or a reflector associated with the light source, wherein Rear projecting edges of the cooling element are arranged in a common plane of extent.
  • Object of the present invention is to develop a lighting device for vehicles such that in a simple manner, a predetermined operating temperature regime for a light source arrangement with a plurality of light sources is ensured long-term stability.
  • the invention has the features of claim 1.
  • the particular advantage of the invention is that compliance with a designated operating temperature range can be ensured for a plurality of light sources.
  • a cooling element of the heat dissipation arrangement is widened in the direction of the air flow, so that the cooling capacity or cooling effect of the cooling element increases in the direction of the air flow.
  • This rising cooling effect of the cooling element serves as compensation for the self-adjusting heating of the air flow guided along the heat sink, so that a uniform cooling of the light sources arranged along the air flow is established by superposition of air flow and cooling effect by cooling elements.
  • the degree of widening of the cooling element in the direction of the air flow or the degree of transverse extension of the cooling element which is perpendicular to the direction of the air flow, depending on the speed and / or temperature of the air flow and / or depending on the distance of adjacent light sources the light source arrangement.
  • the increase in the width of the cooling element is greater, for example, when the air flow heats up more, for example, at a lower velocity of the air flow or a smaller distance of the light sources to each other.
  • the cooling element may be formed in one piece or in several pieces. It is essential that the cooling effect of the cooling element or a plurality of row-shaped and optionally spaced cooling elements increases in the direction of the air flow.
  • the cooling element widened along a rear edge and / or a lateral edge thereof, so that the cooling effect of the cooling element can be varied depending on the number of light sources or the intended arrangement thereof.
  • the degree of cooling effect can be adapted to the photometric requirements.
  • the cooling element can widen continuously or stepwise in the direction of the air flow, so that space requirements can be taken into account.
  • the heat dissipation arrangement on a fan for generating the air flow so that the heating of the air flow, which is guided along the cooling element, can be reduced.
  • the cooling element has a plurality of cooling surfaces which extend perpendicular to the direction of the air flow.
  • the length of these cooling surfaces increases continuously or abruptly in the direction of the air flow. As a result, the cooling capacity of the cooling element can be increased accordingly.
  • one or more cooling elements may be arranged inclined by an opening angle to the direction of the air flow. Between the inclined arranged cooling elements, the cooling surfaces may be arranged, so that the cooling power increases along the air flow direction.
  • the cooling element may also be formed as a metallization, which is applied to a provided with LEDs and / or LED chips carrier board.
  • the spaced-apart cooling elements each have an enlarged area in the direction of the air flow, so that a compensation for the heating of the air flow is created.
  • a lighting device according to the invention can be used as a headlight or as a tail light for vehicles.
  • a light source arrangement 1 and a heat dissipation arrangement 2 are provided.
  • the light source arrangement 1 consists of a plurality of light sources 3, preferably light-emitting diodes (LED) 3, which are arranged in an extension plane E.
  • the light-emitting diodes 3 extend, for example, two-dimensionally in accordance with one Light field. Alternatively, the light-emitting diodes 3 may also extend in a row which is parallel to a direction R of a guided air flow.
  • the heat dissipation arrangement 2 has a fan 4, which is arranged at a first end 5 of the heat dissipation arrangement 2.
  • the light-emitting diodes 3 of the light source arrangement 1 are mechanically and thermally connected to a cooling element 6 of the heat dissipation arrangement 2 extending on a rear side thereof.
  • the cooling element is integrally formed and has a directly adjoining the back of the light emitting diodes 3 heat sink 7 with a plurality of perpendicular to the direction R of the air flow cooling surfaces 8.
  • the cooling element 6 is widened in the direction R of the air flow, wherein a width B2 at a second end 9 of the light source assembly 1 is greater than a width B1 at the first end 5 of the light source assembly 1.
  • the width B or the surface increases for heat dissipation of the cooling element 6 in the direction R of the air flow continuously to form a sloping rear edge 10 of the cooling element 6 at.
  • the width of the heat sink 7 of the cooling element 6 is constant.
  • the lengths of the cooling surfaces 8, which each extend perpendicular to the direction R of the air flow increase.
  • the lengths of the cooling surfaces 8 are matched to the speed and / or temperature of the air stream and / or a distance A adjacent LEDs 3, so that the operating temperature of all light-emitting diodes 3 remain in a predetermined operating temperature frame. If the distance A of the light sources 3 is chosen to be smaller, for example, the lengths of the cooling surfaces 8 increase more strongly. By leveling the operating temperatures of the light sources 3, an undesirable variation of the luminous flux or the color of the light sources is avoided.
  • To guide the air flow in the direction R along the cooling surfaces 8 may be provided by guide walls, not shown, an air duct.
  • the cooling element 6 in the direction R of the air flow also increase stepwise. Incidentally, this also depends on whether the light sources 3 are arranged in a common plane or in a stepped manner relative to one another.
  • the cooling element 6 may also consist of a plurality of cooling element segments, which are arranged directly under the same or at a distance from one another in a row running parallel to the direction of the air flow.
  • a cooling element 16 with a plurality of cooling bodies 17 arranged inclined by an opening angle ⁇ can be formed.
  • the arrangement of the heat sink 17 and the cooling surfaces 18 extends in the direction R of the air flow and formation of an enlarged width B ', which extends perpendicular to the direction R of the air flow.
  • B1 ' At a first end 15 of the cooling element 16, this has a relatively small width B1 '; at a second end 19 of the cooling element 16, this has a relatively large width B2 '.
  • the lighting device is viewed from a rear side.
  • the light sources extend on a front side of the heat sink 18 and are in the FIG. 2 obscured by this.
  • the light sources are formed as LED chips, which are arranged on terminals 25 on a common carrier board 24.
  • a square metallization 26 is applied as a cooling element (cooling surface), which is contacted directly with the terminals 25.
  • a conductor 27 which leads to components of a drive device for the LED chips.
  • the carrier board 24 is arranged upright. Since the air is moved upward in the vertical direction as a result of the thermal buoyancy, the metallizations 26 are designed to be larger in area or wider in the vertical direction. In a lower region 28 of the carrier board 24, the metallization 26 has a width B1 "which is substantially smaller than a width B2" in an upper region 29 of the carrier board 24. The arranged in a vertical direction in a row metallizations 26 are spaced from each other , This results in a step-like increase of the cooling surfaces in a vertical upward direction, wherein there is a zero level between the effected by means of the metallization 26 cooling effect level.
  • the light source assembly 1 and the heat dissipation assembly 2 is arranged integrated in a housing, not shown, of the lighting device.
  • the light sources 3 may be associated with reflectors or other light guiding means.
  • a transparent cover plate is preferably arranged, which covers an opening of the housing.
  • an extension of the cooling element is designated by the width B, B ', B ".This extension can therefore also relate to the depth and the height of the cooling element.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Mathematical Physics (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)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The device has a light source arrangement with a set of LEDs arranged along an extension plane. A heat dissipating arrangement exchanges heat between the light source arrangement and an air stream, and has a cooling unit and an electro-plating (26) that are permanently attached to the diodes. The cooling unit and the electro-plating have the heat dissipation surface that increases along a direction (R) of the air stream, where the direction runs parallel to the extension plane of the diodes.

Description

Die Erfindung betrifft eine Beleuchtungsvorrichtung für Fahrzeuge nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a lighting device for vehicles according to the preamble of patent claim 1.

Aus der DE 10 2004 025 623 A1 ist eine Beleuchtungsvorrichtung für Fahrzeuge bekannt, die zum einen eine Lichtquellenanordnung mit einer Mehrzahl von Lichtquellen und zum anderen eine Wärmeableitanordnung zum Austausch von Wärme zwischen der Lichtquellenanordnung und einem Luftstrom vorsieht. Die Wärmeableitanordnung ist der Lichtquellenanordnung zugeordnet und weist ein Kühlelement mit Kühlflächen auf, entlang derer Luftleitkanäle ausgebildet sind. Das Kühlelement ist als ein Kühlkörper ausgebildet und schließt sich unmittelbar an eine Lichtquelle der Lichtquellenanordnung an. Die Kühlflächen des Kühlelementes sind derart geformt, dass der Luftstrom im Wesentlichen in Richtung einer Lichtabstrahlrichtung der Lichtquellen geführt ist, so dass der Luftstrom dazu genutzt werden kann, eine Abschlussscheibe der Beleuchtungsvorrichtung eis- und beschlagfrei zu halten. Damit die Lichtquellen ausreichend gekühlt werden, weist die Wärmeableitanordnung einen Wärmeüberträger auf, der eine Kühlung des Luftstroms bewirkt. Die Einhaltung der Betriebstemperatur der Lichtquellen wird somit im Wesentlichen durch Temperierung des Luftstromes bewirkt.From the DE 10 2004 025 623 A1 a lighting device for vehicles is known, which provides on the one hand a light source arrangement with a plurality of light sources and on the other a heat dissipation arrangement for the exchange of heat between the light source arrangement and an air flow. The heat dissipation arrangement is associated with the light source arrangement and has a cooling element with cooling surfaces along which air guide channels are formed. The cooling element is designed as a heat sink and connects directly to a light source of the light source arrangement. The cooling surfaces of the cooling element are shaped such that the air flow is guided substantially in the direction of a light emission direction of the light sources, so that the air flow can be used to keep a lens of the lighting device ice and fog free. In order for the light sources to be sufficiently cooled, the heat dissipation arrangement has a heat exchanger which effects a cooling of the air flow. Compliance with the operating temperature of the light sources is thus effected substantially by tempering the air flow.

Aus der DE 102 27 720 A1 ist eine Beleuchtungsvorrichtung für Fahrzeuge bekannt, die eine Lichtquellenanordnung mit einer Lichtquelle und einer Wärmeableitanordnung mit einem Kühlkörper vorsieht. Der Kühlkörper ist unmittelbar der Lichtquelle zugeordnet, so dass die Kühlung der Lichtquelle durch eine gezielte Luftführung ermöglicht wird. Der Kühlkörper ist jeweils einer Lichtquelle zugeordnet.From the DE 102 27 720 A1 For example, a lighting device for vehicles is known, which provides a light source arrangement with a light source and a heat dissipation arrangement with a heat sink. The heat sink is directly associated with the light source, so that the cooling of the light source is made possible by a targeted air flow. The heat sink is in each case assigned to a light source.

Aus der US 2005/201098 A1 ist eine Beleuchtungsvorrichtung für Fahrzeuge bekannt, die zum einen eine Lichtquellenanordnung mit einer Mehrzahl von in einer Erstreckungsebene angeordnete Lichtquellen und zum anderen eine Wärmeableitungsanordnung mit einem Kühlelement zum Austausch von Wärme zwischen der Lichtquellenanordnung und einem Luftstrom aufweist. Das Kühlelement erstreckt sich rückseitig der Lichtquelle bzw. eines der Lichtquelle zugeordneten Reflektors, wobei nach hinten abragende Ränder des Kühlelementes in einer gemeinsamen Erstreckungsebene angeordnet sind.From the US 2005/201098 A1 For example, an illumination device for vehicles is known, which has, on the one hand, a light source arrangement with a plurality of light sources arranged in an extension plane and, on the other hand, a heat dissipation arrangement with a cooling element for exchanging heat between the light source arrangement and an air flow. The cooling element extends at the back of the light source or a reflector associated with the light source, wherein Rear projecting edges of the cooling element are arranged in a common plane of extent.

Aufgabe der vorliegenden Erfindung ist es, eine Beleuchtungsvorrichtung für Fahrzeuge derart weiterzubilden, dass auf einfache Weise ein vorgegebenes Betriebstemperaturregime für eine Lichtquellenanordnung mit einer Mehrzahl von Lichtquellen langzeitstabil gewährleistet ist.Object of the present invention is to develop a lighting device for vehicles such that in a simple manner, a predetermined operating temperature regime for a light source arrangement with a plurality of light sources is ensured long-term stability.

Zur Lösung dieser Aufgabe weist die Erfindung die Merkmale des Patentanspruchs 1 auf.To solve this problem, the invention has the features of claim 1.

Der besondere Vorteil der Erfindung besteht darin, dass für eine Mehrzahl von Lichtquellen die Einhaltung eines vorgesehenen Betriebstemperaturbereiches gewährleistet werden kann. Nach der Erfindung ist ein Kühlelement der Wärmeableitanordnung in Richtung des Luftstromes verbreitert ausgebildet, so dass die Kühlleistung bzw. Kühlwirkung des Kühlelementes in Richtung des Luftstromes ansteigt. Diese ansteigende Kühlwirkung des Kühlelementes dient als Kompensation für die sich einstellende Erwärmung des entlang des Kühlkörpers geführten Luftstromes, so dass durch Überlagerung von Luftstrom und Kühlwirkung durch Kühlelemente sich eine gleichmäßige Kühlung der entlang des Luftstromes angeordneten Lichtquellen einstellt. Nach der Erfindung ist der Grad der Verbreiterung des Kühlelementes in Richtung des Luftstromes bzw. der Grad der Quererstreckung des Kühlelementes, die senkrecht zur Richtung des Luftstromes verläuft, abhängig von der Geschwindigkeit und/oder der Temperatur des Luftstromes und/oder abhängig vom Abstand benachbarter Lichtquellen der Lichtquellenanordnung. Der Anstieg der Breite des Kühlelementes ist beispielsweise größer, wenn sich der Luftstrom stärker erwärmt, beispielsweise bei geringerer Geschwindigkeit des Luftstromes bzw. geringerem Abstand der Lichtquellen zueinander. Das Kühlelement kann einstückig oder mehrstückig ausgebildet sein. Wesentlich ist, dass die Kühlwirkung des Kühlelementes oder einer Mehrzahl von reihenförmig angeordneten und gegebenenfalls beabstandeten Kühlelementen in Richtung des Luftstromes ansteigt.The particular advantage of the invention is that compliance with a designated operating temperature range can be ensured for a plurality of light sources. According to the invention, a cooling element of the heat dissipation arrangement is widened in the direction of the air flow, so that the cooling capacity or cooling effect of the cooling element increases in the direction of the air flow. This rising cooling effect of the cooling element serves as compensation for the self-adjusting heating of the air flow guided along the heat sink, so that a uniform cooling of the light sources arranged along the air flow is established by superposition of air flow and cooling effect by cooling elements. According to the invention, the degree of widening of the cooling element in the direction of the air flow or the degree of transverse extension of the cooling element, which is perpendicular to the direction of the air flow, depending on the speed and / or temperature of the air flow and / or depending on the distance of adjacent light sources the light source arrangement. The increase in the width of the cooling element is greater, for example, when the air flow heats up more, for example, at a lower velocity of the air flow or a smaller distance of the light sources to each other. The cooling element may be formed in one piece or in several pieces. It is essential that the cooling effect of the cooling element or a plurality of row-shaped and optionally spaced cooling elements increases in the direction of the air flow.

Nach einer Weiterbildung der Erfindung verbreitert sich das Kühlelement entlang eines rückseitigen Randes und/oder eines seitlichen Randes desselben, so dass die Kühlwirkung des Kühlelementes in Abhängigkeit von der Anzahl der Lichtquellen bzw. der vorgesehenen Anordnung derselben variiert werden kann. Vorteilhaft kann hierdurch insbesondere der Grad der Kühlwirkung an die lichttechnischen Erfordernisse angepasst werden.According to a development of the invention, the cooling element widened along a rear edge and / or a lateral edge thereof, so that the cooling effect of the cooling element can be varied depending on the number of light sources or the intended arrangement thereof. Advantageously, in this way, in particular, the degree of cooling effect can be adapted to the photometric requirements.

Nach einer Weiterbildung der Erfindung kann sich das Kühlelement kontinuierlich oder stufenförmig in Richtung des Luftstromes verbreitern, so dass Bauraumerfordernisse berücksichtigt werden können.According to a development of the invention, the cooling element can widen continuously or stepwise in the direction of the air flow, so that space requirements can be taken into account.

Nach einer Weiterbildung der Erfindung weist die Wärmeableitanordnung einen Lüfter zur Erzeugung des Luftstromes auf, so dass die Erwärmung des Luftstromes, der entlang des Kühlelementes geführt ist, verringert werden kann.According to a development of the invention, the heat dissipation arrangement on a fan for generating the air flow, so that the heating of the air flow, which is guided along the cooling element, can be reduced.

Nach einer Weiterbildung der Erfindung weist das Kühlelement eine Mehrzahl von Kühlflächen auf, die sich senkrecht zur Richtung des Luftstromes erstrecken. Die Länge dieser Kühlflächen vergrößert sich kontinuierlich oder schlagartig in Richtung des Luftstromes. Hierdurch kann die Kühlleistung des Kühlelementes entsprechend erhöht werden.According to a development of the invention, the cooling element has a plurality of cooling surfaces which extend perpendicular to the direction of the air flow. The length of these cooling surfaces increases continuously or abruptly in the direction of the air flow. As a result, the cooling capacity of the cooling element can be increased accordingly.

Nach einer Weiterbildung der Erfindung können ein oder mehrere Kühlelemente um einen Öffnungswinkel geneigt zu der Richtung des Luftstromes angeordnet sein. Zwischen den geneigten angeordneten Kühlelementen können die Kühlflächen angeordnet sein, so dass die Kühlleistung entlang der Luftstromrichtung ansteigt.According to a development of the invention, one or more cooling elements may be arranged inclined by an opening angle to the direction of the air flow. Between the inclined arranged cooling elements, the cooling surfaces may be arranged, so that the cooling power increases along the air flow direction.

Nach einer Weiterbildung der Erfindung kann das Kühlelement auch als eine Metallisierung ausgebildet sein, die auf einer mit LEDs und/oder LED-Chips versehenen Trägerplatine aufgebracht ist. Die beabstandet zueinander angeordneten Kühlelemente weisen in Richtung des Luftstromes jeweils eine vergrößerte Fläche auf, so dass eine Kompensation zu der Erwärmung des Luftstromes geschaffen wird.According to a development of the invention, the cooling element may also be formed as a metallization, which is applied to a provided with LEDs and / or LED chips carrier board. The spaced-apart cooling elements each have an enlarged area in the direction of the air flow, so that a compensation for the heating of the air flow is created.

Weitere Vorteile der Erfindung ergeben sich aus den weiteren Unteransprüchen.Further advantages of the invention will become apparent from the further subclaims.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnungen näher erläutert.Embodiments of the invention are explained below with reference to the drawings.

Dabei zeigt:

Fig. 1
einen Längsschnitt durch eine Beleuchtungsvorrichtung nach einer ersten Ausführungsform mit einem sich entgegen der Richtung des Luftstroms verjüngenden Kühlelement für eine Mehrzahl von Lichtquellen einer Lichtquellenanordnung,
Fig. 2
einen Längsschnitt durch eine Beleuchtungsvorrichtung nach einer zweiten Ausführungsform, wobei mehrere Kühlelemente einer Wärmeableitanordnung um einen Öffnungswinkel geneigt zur Richtung des Luftstromes angeordnet sind, und
Fig. 3
eine Draufsicht auf eine Beleuchtungsvorrichtung nach einer dritten Ausführungsform mit LED-Chips als Lichtquellen, die auf einer Trägerplatine aufbringbar sind und denen jeweils Metallisierungen als Kühlelemente zugeordnet sind, deren Flächen in Richtung des Luftstromes ansteigen.
Showing:
Fig. 1
a longitudinal section through a lighting device according to a first embodiment with a counter to the direction of the air flow tapered cooling element for a plurality of light sources of a light source arrangement,
Fig. 2
a longitudinal section through a lighting device according to a second embodiment, wherein a plurality of cooling elements of a Wärmeableitanordnung are arranged at an opening angle inclined to the direction of the air flow, and
Fig. 3
a plan view of a lighting device according to a third embodiment with LED chips as light sources, which can be applied to a carrier board and each of which metallizations are assigned as cooling elements, the surfaces of which increase in the direction of air flow.

Eine erfindungsgemäße Beleuchtungsvorrichtung kann als Scheinwerfer oder als eine Heckleuchte für Fahrzeuge eingesetzt werden.A lighting device according to the invention can be used as a headlight or as a tail light for vehicles.

Nach einer ersten Ausführungsform einer Beleuchtungsvorrichtung gemäß Figur 1 ist eine Lichtquellenanordnung 1 und eine Wärmeableitanordnung 2 vorgesehen.According to a first embodiment of a lighting device according to FIG. 1 a light source arrangement 1 and a heat dissipation arrangement 2 are provided.

Die Lichtquellenanordnung 1 besteht aus einer Mehrzahl von Lichtquellen 3, vorzugsweise Leuchtdioden (LED) 3, die in einer Erstreckungsebene E angeordnet sind. Die Leuchtdioden 3 erstrecken sich beispielsweise zweidimensional entsprechend einem Leuchtfeld. Alternativ können sich die Leuchtdioden 3 auch in einer Reihe erstrecken, die parallel zu einer Richtung R eines geführten Luftstromes verläuft.The light source arrangement 1 consists of a plurality of light sources 3, preferably light-emitting diodes (LED) 3, which are arranged in an extension plane E. The light-emitting diodes 3 extend, for example, two-dimensionally in accordance with one Light field. Alternatively, the light-emitting diodes 3 may also extend in a row which is parallel to a direction R of a guided air flow.

Zur Bildung des geführten Luftstromes in Richtung R weist die Wärmeableitanordnung 2 einen Lüfter 4 auf, der an einem ersten Ende 5 der Wärmeableitanordnung 2 angeordnet ist.To form the guided air flow in the direction R, the heat dissipation arrangement 2 has a fan 4, which is arranged at a first end 5 of the heat dissipation arrangement 2.

Die Leuchtdioden 3 der Lichtquellenanordnung 1 sind mechanisch und thermisch mit einem sich an einer Rückseite derselben erstreckenden Kühlelement 6 der Wärmeableitanordnung 2 verbunden. Im vorliegenden Ausführungsbeispiel ist das Kühlelement einstückig ausgebildet und weist einen sich unmittelbar an der Rückseite der Leuchtdioden 3 anschließenden Kühlkörper 7 mit einer Mehrzahl von senkrecht zur Richtung R des Luftstromes angeordneten Kühlflächen 8 auf.The light-emitting diodes 3 of the light source arrangement 1 are mechanically and thermally connected to a cooling element 6 of the heat dissipation arrangement 2 extending on a rear side thereof. In the present embodiment, the cooling element is integrally formed and has a directly adjoining the back of the light emitting diodes 3 heat sink 7 with a plurality of perpendicular to the direction R of the air flow cooling surfaces 8.

Das Kühlelement 6 ist in Richtung R des Luftstromes verbreitert ausgebildet, wobei eine Breite B2 an einem zweiten Ende 9 der Lichtquellenanordnung 1 größer ist als eine Breite B1 an dem ersten Ende 5 der Lichtquellenanordnung 1. Im vorliegenden Ausführungsbeispiel steigt die Breite B bzw. die Oberfläche zur Wärmeabgabe des Kühlelementes 6 in Richtung R des Luftstromes kontinuierlich unter Bildung einem schräg verlaufenden rückseitigen Rand 10 des Kühlelementes 6 an. Die Breite des Kühlkörpers 7 des Kühlelementes 6 ist konstant. Zur Erhöhung der Kühlwirkung des Kühlelementes 6 in Richtung R des Luftstromes steigen die Längen der Kühlflächen 8, die sich jeweils senkrecht zur Richtung R des Luftstromes erstrecken, an. Die Längen der Kühlflächen 8 sind auf die Geschwindigkeit und/oder Temperatur des Luftstromes und/oder eines Abstandes A benachbarter Leuchtdioden 3 abgestimmt, so dass die Betriebstemperatur aller Leuchtdioden 3 in einem vorgegebenen Betriebstemperaturrahmen verbleiben. Ist der Abstand A der Lichtquellen 3 beispielsweise geringer gewählt, steigen die Längen der Kühlflächen 8 stärker an. Durch das Nivellieren der Betriebstemperaturen der Lichtquellen 3 wird eine unerwünschte Variierung des Lichtstromes bzw. der Farbe der Lichtquellen vermieden.The cooling element 6 is widened in the direction R of the air flow, wherein a width B2 at a second end 9 of the light source assembly 1 is greater than a width B1 at the first end 5 of the light source assembly 1. In the present embodiment, the width B or the surface increases for heat dissipation of the cooling element 6 in the direction R of the air flow continuously to form a sloping rear edge 10 of the cooling element 6 at. The width of the heat sink 7 of the cooling element 6 is constant. To increase the cooling effect of the cooling element 6 in the direction R of the air flow, the lengths of the cooling surfaces 8, which each extend perpendicular to the direction R of the air flow, increase. The lengths of the cooling surfaces 8 are matched to the speed and / or temperature of the air stream and / or a distance A adjacent LEDs 3, so that the operating temperature of all light-emitting diodes 3 remain in a predetermined operating temperature frame. If the distance A of the light sources 3 is chosen to be smaller, for example, the lengths of the cooling surfaces 8 increase more strongly. By leveling the operating temperatures of the light sources 3, an undesirable variation of the luminous flux or the color of the light sources is avoided.

Zur Führung des Luftstromes in Richtung R entlang der Kühlflächen 8 kann durch nicht dargestellte Leitwandungen ein Luftkanal vorgesehen sein.To guide the air flow in the direction R along the cooling surfaces 8 may be provided by guide walls, not shown, an air duct.

Alternativ kann das Kühlelement 6 in Richtung R des Luftstromes auch stufenförmig ansteigen. Dies hängt im Übrigen auch davon ab, ob die Lichtquellen 3 in einer gemeinsamen Ebene oder stufenförmig zueinander angeordnet sind. Alternativ kann das Kühlelement 6 auch aus mehreren Kühlelementsegmenten bestehen, die unter direkter Anlage derselben oder beabstandet zueinander in einer parallel zur Richtung des Luftstromes verlaufenden Reihe angeordnet sind.Alternatively, the cooling element 6 in the direction R of the air flow also increase stepwise. Incidentally, this also depends on whether the light sources 3 are arranged in a common plane or in a stepped manner relative to one another. Alternatively, the cooling element 6 may also consist of a plurality of cooling element segments, which are arranged directly under the same or at a distance from one another in a row running parallel to the direction of the air flow.

Nach einer zweiten Ausführungsform der Beleuchtungsvorrichtung gemäß Figur 2 kann ein Kühlelement 16 mit einer Mehrzahl von um einen Öffnungswinkel Ö geneigt angeordneten Kühlkörpern 17 ausgebildet sein. Zwischen den Kühlkörpern 17 verlaufen Kühlflächen 18. Die Anordnung der Kühlkörper 17 und der Kühlflächen 18 verläuft in Richtung R des Luftstromes und Bildung einer vergrößerten Breite B', die sich senkrecht zur Richtung R des Luftstromes erstreckt. An einem ersten Ende 15 des Kühlelementes 16 weist dieses eine relativ kleine Breite B1'; an einem zweiten Ende 19 des Kühlelementes 16 weist dieses eine relativ große Breite B2' auf. Ein seitlicher Rand 20 des Kühlelementes 16, der sich im Wesentlichen senkrecht zu der Erstreckungsebene E und senkrecht zu einem rückseitigen Rand des Kühlelementes 17 erstreckt, ist verbreitert ausgebildet. In Figur 2 ist die Beleuchtungsvorrichtung von einer Rückseite her betrachtet. Die Lichtquellen erstrecken sich auf einer Vorderseite der Kühlkörper 18 und sind in der Figur 2 durch diese verdeckt.According to a second embodiment of the lighting device according to FIG. 2 For example, a cooling element 16 with a plurality of cooling bodies 17 arranged inclined by an opening angle Ö can be formed. The arrangement of the heat sink 17 and the cooling surfaces 18 extends in the direction R of the air flow and formation of an enlarged width B ', which extends perpendicular to the direction R of the air flow. At a first end 15 of the cooling element 16, this has a relatively small width B1 '; at a second end 19 of the cooling element 16, this has a relatively large width B2 '. A lateral edge 20 of the cooling element 16, which extends substantially perpendicular to the extension plane E and perpendicular to a rear edge of the cooling element 17, is widened. In FIG. 2 the lighting device is viewed from a rear side. The light sources extend on a front side of the heat sink 18 and are in the FIG. 2 obscured by this.

Nach einer dritten Ausführungsform einer Beleuchtungsvorrichtung gemäß Figur 3 sind die Lichtquellen als LED-Chips ausgebildet, die über Anschlüsse 25 auf einer gemeinsamen Trägerplatine 24 angeordnet sind. Unmittelbar benachbart zu den Anschlüssen 25 der LED-Chips ist eine quadratische Metallisierung 26 als Kühlelement (Kühlfläche) aufgebracht, die unmittelbar mit den Anschlüssen 25 kontaktiert ist. An die Metallisierung 26 schließt sich auf einer den Anschlüssen 25 gegenüberliegenden Seite eine Leiterbahn 27 an, die zu Bauteilen einer Ansteuereinrichtung für die LED-Chips führt.According to a third embodiment of a lighting device according to FIG. 3 the light sources are formed as LED chips, which are arranged on terminals 25 on a common carrier board 24. Immediately adjacent to the terminals 25 of the LED chips, a square metallization 26 is applied as a cooling element (cooling surface), which is contacted directly with the terminals 25. On the metallization 26 is followed on a side opposite the terminals 25, a conductor 27, which leads to components of a drive device for the LED chips.

Die Trägerplatine 24 ist aufrecht angeordnet. Da die Luft infolge des thermischen Auftriebes in vertikaler Richtung nach oben bewegt wird, sind die Metallisierungen 26 in vertikaler Richtung hin verlaufend flächengrößer bzw. breiter ausgebildet. In einem unteren Bereich 28 der Trägerplatine 24 weist die Metallisierung 26 eine Breite B1" auf, die wesentlich kleiner ist als eine Breite B2" in einem oberen Bereich 29 der Trägerplatine 24. Die in vertikaler Richtung in einer Reihe angeordneten Metallisierungen 26 sind beabstandet zueinander angeordnet. Hierdurch ergibt sich eine stufenförmige Steigerung der Kühlflächen in vertikaler Richtung nach oben, wobei zwischen dem vermittels der Metallisierungen 26 bewirkten Kühlwirkungsniveau ein Null-Niveau vorliegt.The carrier board 24 is arranged upright. Since the air is moved upward in the vertical direction as a result of the thermal buoyancy, the metallizations 26 are designed to be larger in area or wider in the vertical direction. In a lower region 28 of the carrier board 24, the metallization 26 has a width B1 "which is substantially smaller than a width B2" in an upper region 29 of the carrier board 24. The arranged in a vertical direction in a row metallizations 26 are spaced from each other , This results in a step-like increase of the cooling surfaces in a vertical upward direction, wherein there is a zero level between the effected by means of the metallization 26 cooling effect level.

Bei der Beleuchtungsvorrichtung gemäß Figur 3 liegt eine natürliche Konvektion vor, ohne dass zusätzlich ein Lüfter in die Beleuchtungsvorrichtung integriert ist.In the lighting device according to FIG. 3 There is a natural convection, without the addition of a fan is integrated into the lighting device.

Bei den Ausführungsformen gemäß den Figuren 1 und 2 liegt eine erzwungene Konvektion vor, wobei in der Wärmeableitanordnung 2 der Lüfter 4 integriert ist.In the embodiments according to the Figures 1 and 2 there is a forced convection, wherein in the heat dissipation arrangement 2, the fan 4 is integrated.

Es versteht sich, dass die Lichtquellenanordnung 1 und die Wärmeableitanordnung 2 in einem nicht dargestellten Gehäuse der Beleuchtungsvorrichtung integriert angeordnet ist. Den Lichtquellen 3 können Reflektoren oder andere Lichtführungsmittel zugeordnet sein. In Lichtabstrahlrichtung 11 vor den Lichtquellen 3 ist vorzugsweise eine transparente Abdeckscheibe angeordnet, die eine Öffnung des Gehäuses abdeckt.It is understood that the light source assembly 1 and the heat dissipation assembly 2 is arranged integrated in a housing, not shown, of the lighting device. The light sources 3 may be associated with reflectors or other light guiding means. In the light emission direction 11 in front of the light sources 3, a transparent cover plate is preferably arranged, which covers an opening of the housing.

Es versteht sich ferner, dass mit der Breite B, B', B" eine Erstreckung des Kühlelementes bezeichnet ist. Diese Erstreckung kann somit auch die Tiefe und die Höhe des Kühlelementes betreffen.It is further understood that an extension of the cooling element is designated by the width B, B ', B ".This extension can therefore also relate to the depth and the height of the cooling element.

Claims (9)

  1. Lighting apparatus for vehicles comprising
    - a configuration of light sources (1) with a plurality of light sources (3) arranged on an extending face, wherein the extending face (E) is perpendicular to a direction of light emitted (11) by the light sources (3);
    - a heat dissipation setup (2) for the exchange of heat between the configuration of light sources (1) and an air flow by means of a cooling element (6, 16, 26), wherein said cooling element (6, 16, 26) is allocated to the light sources (3);
    wherein the air of said air flow flows in a direction (R) parallel to the extending face (E) of the light sources (3), characterized in that the cooling element (6, 16, 26) has an enlarged surface (B) in the direction (R) of the air flow such that said enlarged surface (B) is dependent on the temperature and/or the speed of the air flow and/or the spacing of adjacent light sources (3).
  2. Lighting apparatus of claim 1, characterized in that the cooling element (6, 16) becomes wider along a rear element side (10) facing away from the light sources (3) and/or along a lateral element edge (20) extending in the direction of the extending face (E) of the light sources (3).
  3. Lighting apparatus of claim 1 or 2, characterized in that the cooling element (6, 16, 26) becomes wider in the direction (R) of the air flow either continuously or in steps.
  4. Lighting apparatus of claims 1 to 3, characterized in that the heat dissipation setup (2) comprises a fan (4) for generating the air flow across and along the cooling element (6, 16).
  5. Lighting apparatus of claims 1 to 4, characterized in that the cooling element (6, 16) is designed as a heat sink (7, 17) with a plurality of cooling faces (8, 18) perpendicular to the direction (R) of the air flow, wherein the length of the cooling faces (8, 18) increases in the direction (R) of the air flow.
  6. Lighting apparatus of claims 1 to 5, characterized in that it comprises a plurality of heat sinks (17) tilting against the direction (R) of the air flow by an aperture angle (Ö).
  7. Lighting apparatus of claims 1 to 6, characterized in that each of the light sources (3) is a light emitting diode.
  8. Lighting apparatus of claims 1 to 7, characterized in that the light sources (3) are LED chips placed on a circuit board (24) and in that the cooling element is a plating (26) on the circuit board (24) adjacent to the connectors (25) of the LED chips, wherein the surface area of the plating (26) increases in the direction (R) of the air flow.
  9. Lighting apparatus of claims 1 to 8, characterized in that the light sources (3) are arranged in rows in the direction (R) of the air flow and in that the cooling element (6, 16, 26) is coupled to the light sources (3) both mechanically and thermally.
EP07117934A 2006-10-19 2007-10-05 Illumination device for vehicles Active EP1914472B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006049299A DE102006049299A1 (en) 2006-10-19 2006-10-19 Lighting device for vehicles

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EP1914472A1 EP1914472A1 (en) 2008-04-23
EP1914472B1 true EP1914472B1 (en) 2009-09-02

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DE (2) DE102006049299A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2241803B1 (en) * 2001-05-26 2018-11-07 GE Lighting Solutions, LLC High power LED-lamp for spot illumination
DE10227720B4 (en) 2002-06-21 2006-01-19 Audi Ag LED headlights for motor vehicles
WO2005088190A1 (en) 2004-03-10 2005-09-22 Truck-Lite Co., Inc. Interior lamp
DE102004025623A1 (en) * 2004-05-25 2005-12-15 Hella Kgaa Hueck & Co. Headlight for a motor vehicle
DE102004047324A1 (en) * 2004-09-29 2006-04-13 Osram Opto Semiconductors Gmbh LED array
DE202005007501U1 (en) * 2005-05-12 2005-08-18 Automotive Lighting Reutlingen Gmbh Vehicle light, consists of at least one light diode chip mechanically and electrically fixed to a circuit board
FR2885990B1 (en) * 2005-05-23 2007-07-13 Valeo Vision Sa LIGHT - EMITTING DIODE LIGHTING AND / OR SIGNALING DEVICE FOR MOTOR VEHICLE.

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EP1914472A1 (en) 2008-04-23
DE502007001438D1 (en) 2009-10-15
DE102006049299A1 (en) 2008-04-30
ATE441811T1 (en) 2009-09-15

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