EP1749170B1 - Headlight for a motor vehicle - Google Patents

Headlight for a motor vehicle Download PDF

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Publication number
EP1749170B1
EP1749170B1 EP05740258A EP05740258A EP1749170B1 EP 1749170 B1 EP1749170 B1 EP 1749170B1 EP 05740258 A EP05740258 A EP 05740258A EP 05740258 A EP05740258 A EP 05740258A EP 1749170 B1 EP1749170 B1 EP 1749170B1
Authority
EP
European Patent Office
Prior art keywords
heat
conducting means
air flow
light
emitting diode
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.)
Expired - Fee Related
Application number
EP05740258A
Other languages
German (de)
French (fr)
Other versions
EP1749170A1 (en
Inventor
Guido Buthe
Matthias Kalwa
Ulrich KÖHLER
Erik Woldt
Karsten Eichhorn
Sascha Dr. Nolte
Winfried Sprenger
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hella KGaA Huek and Co filed Critical Hella KGaA Huek and Co
Publication of EP1749170A1 publication Critical patent/EP1749170A1/en
Application granted granted Critical
Publication of EP1749170B1 publication Critical patent/EP1749170B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • 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]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating 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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps
    • 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
    • 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
    • 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
    • F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
    • F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • 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
    • F21S45/60—Heating of lighting devices, e.g. for demisting
    • 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

  • a headlamp with a light-emitting diode arrangement is for example from the German utility model DE 201 15 772 U1 known.
  • an array of LEDs replaced a conventional halogen lamp.
  • the light-emitting diode array is provided with heat conducting means, for example a heat sink, which can dissipate the heat of the light emitting diodes in a suitable manner.
  • white light emitting diodes produce no infrared radiation, which is generated in conventional headlamps by the halogen light source and can be used to defrost or defrost the headlight cover disc.
  • document DE 102 27720 A1 discloses a headlamp according to the preamble of claim 1.
  • the headlight cover plate can be kept ice and fog free.
  • a headlamp with the features of claim 1.
  • the heat conducting means is equipped with at least one air guide, which is adapted to direct the outgoing air flow in a direction parallel to the preferred direction of emission of the emitted light, the heat generated by the light-emitting diodes instead of the infrared radiation emitted by conventional halogen lamps to De-icing the headlight cover disc exploited, but essentially no structural changes must be made to the heat, analogous to the infrared radiation of a halogen lamp, always to transport in the direction of the preferred direction of radiation.
  • the heat conducting means at least partially has a cylindrical shape, wherein a core is provided, from which cooling fins extend in the radial direction, wherein the interstices of the cooling fins form shipsleitkanäle.
  • a configuration of the heat conduction is compact and is particularly advantageously designed to form a heated outgoing air flow, which is aligned parallel to the preferred emission direction of the light emitting diode array.
  • the cooling fins in the longitudinal direction of the heat conducting, wherein the core has a recess which is suitable for receiving the light emitting diode array.
  • the heat-conducting is also used as a receiving means for the light-emitting diode array, whereby a very compact embodiment of the headlight results.
  • the core has a conical shape. Accordingly, the heat-conducting medium can be flowed in from the pointed side of the core, whereby the streamlined shape of the core results in an advantageous low-pressure flow behavior.
  • the heat conducting means is rotatable about its longitudinal axis and at least partially has a semi-cylindrical shape, wherein the cooling ribs extend in the circumferential direction and the core has a recess which is suitable for receiving the light emitting diode array.
  • Such an arrangement is particularly suitable for example rotatable embodiment of the combination of heat sink and light emitting diode array. If, for example, the heat conducting means is rotated about its longitudinal axis, the inflow profile of the heat conducting means does not change significantly, since the cooling fins are arranged in the circumferential direction or in the direction of rotation. In this way, a Kurven Eisenweinwerfer or the tilt adjustment of a headlamp can be realized with simultaneous advantageous air flow behavior.
  • the heat conducting means has a cuboid shape, the heat conducting means having a cover plate departing from the cooling fins, whose interspaces form air guide channels for conducting the outgoing air flow, wherein the cover plate is suitable for receiving the light emitting diode arrangement , wherein an optical deflection means is provided, which is adapted to the light generated by the light emitting diode assembly in one direction to divert parallel to the outgoing airflow.
  • a cuboid heat sink is used, which is easy to edit and inexpensive available in large quantities as a semi-finished product.
  • the heat conducting means is enclosed by a planteosargekoruse, which has holding webs which are suitable for receiving a lens or a raster in front of the light emitting diode array.
  • a planteosargekoruse which has holding webs which are suitable for receiving a lens or a raster in front of the light emitting diode array.
  • the recess is equipped with a reflector and / or has a reflective surface. As a result, a good light output in the direction of the preferred emission direction is achieved.
  • a heat exchanger is provided which is adapted to selectively supply heat to the air flow or to withdraw.
  • a heat exchanger is provided which is adapted to selectively supply heat to the air flow or to withdraw.
  • the heat conducting means is suitable for directing the outgoing air flow in the direction of the preferred emission direction of the emitted light.
  • the headlight is equipped with a further heat conducting means which is suitable for directing an outgoing air flow against the preferred emission direction of the emitted light. Accordingly, both a supply of air and air removal from the light space can be achieved by a combination of such heat-conducting elements.
  • a combination is conceivable, for example, in a headlight that is equipped with a dipped beam and a fog light and / or separate high beam.
  • the air flow in the manner according to the invention can be dissipated, for example, via the heat conducting means of the fog light.
  • the heat source as such is not adjustable, because the main task of the lighting device is still to act as a light source.
  • the bulbs can not be sufficiently cooled, for example, or too long to provide sufficient heat to de-ice the headlight cover disc available.
  • An inventive headlight 1 essentially comprises a cylindrical heat conducting means housing 8, in which a cooling body 3 is accommodated with a light emitting diode arrangement 2.
  • the skilletleitschgepian 8 is provided on one side with support webs 16, which serve as a receptacle for a lens 17 or a shader, wherein the light of the LED array 2 is projected via the lens 17 onto a headlight cover lens.
  • the heat conducting means 3 itself has a cylindrical shape with a solid core 13, wherein cooling fins 10 extend in the radial direction along a longitudinal axis 11 of the heat conducting means 3 from the solid core 13 and in this embodiment form a number of air guide channels 12 together with the heat conducting means housing 8 , which are aligned substantially in the direction of the lens 17 and the headlight cover disk.
  • the air ducts 12 are also formed when no sauceleitffengephase 8 is provided.
  • the heat conducting means 3 is designed rotationally symmetrical about its longitudinal axis 11.
  • the heat-conducting means 3 has a conical recess 14 within the solid core 13, wherein the conical recess 14 can continue into the region of the cooling ribs 10.
  • the optical axis of the light emitting diode arrangement 2 coincides with the longitudinal axis 11 of the heat conducting means 3.
  • FIG Fig. 2 Another embodiment of a heat conducting means 20 is shown in FIG Fig. 2 shown.
  • the heat conducting means 20 used here has essentially a semi-cylindrical shape, wherein the heat conducting means 20 likewise comprises a solid core 24, around which the cooling ribs 23 are arranged radially.
  • the cooling fins 23 are in contrast to the heat sink 3 from Fig. 1 aligned in the circumferential direction and not in the longitudinal direction.
  • the cooling fins 23 form air channels 25, which can be flown by an incoming air flow 4, and leave the heat conducting means 20 in an outgoing air flow 5, which is substantially aligned with the headlight cover disc.
  • a recess 22 for receiving the light-emitting diode arrangement 2 is provided, whose optical axis is also aligned in the direction of the headlight cover disc.
  • FIG. 3 a further embodiment of a heat conducting 30 is shown.
  • the heat-conducting agent 30 used here is essentially the same as in FIG Fig. 1 shown heat conduction means 3 and comprises a solid core 31 which is radially equipped with cooling fins 32 extending in the longitudinal direction of the heat conducting 30 and form Heilleitkanäle 33.
  • the solid core 31 has a conical shape, wherein the incoming air flow flows to the core 31 from the acute side, is passed through the Heilleitkanäle 25 between the cooling fins 32 and the heat conducting 30 as outgoing air flow 5 in the direction of Headlight terminus leaves.
  • a recess 34 is provided in the middle of the heat-conducting means 30, which serves as a receptacle for the light-emitting diode arrangement 2.
  • FIG Fig. 4 Another alternative embodiment of a heat conducting means 40 is shown in FIG Fig. 4 shown.
  • the heat conducting means 40 has a substantially cuboidal shape and is provided with a cover plate 43. From the cover plate 43, cooling ribs 41 extend, wherein the intermediate spaces of the cooling ribs 41 form air guide channels 42. Furthermore, it is provided to arrange the light-emitting diode arrangement 2 on the head side of the cover plate 43 and to use a mirror 44 or a prism, so that the light of the light-emitting diode arrangement 2 can be deflected in the direction of the outgoing air flow 5, so that both the light of the light-emitting diode arrangement 2, as Also, the heated air flow 5 can be aligned with the headlight cover disc.
  • the heat conducting means 20, 30, 40 according to the Fig. 2 to 4 swivel designed. It is Furthermore provided that the respective heat conducting means 20, 30, 40 is at least partially enclosed by the housing 9, wherein the housing 9 each having an opening 15 through which the incoming air flow 4 can flow into the air ducts 12. Such a configuration of the air supply, the cooling fin surface can be largely independent of the respective pivot angle of the heat conducting 3, 20, 30, 40 are flown. Such advantageous flow is supported, for example, by a heat conducting means 20 Fig. 2 in which the orientation of the cooling fins 23 with respect to the incoming air stream 4 does not change despite a pivoting of the heat conducting means 20 about the longitudinal axis. Alternatively, for example, as in Fig.
  • a streamlined configuration of the heat conducting means 30 may be provided in order to ensure a pressure loss-free as possible air flow.
  • All embodiments of the heat conducting means 3, 20, 30, 40 are ultimately common in that the outgoing air flow 5 can be directed in a direction parallel to the preferred emission direction 18 of the light of the light emitting diode arrangement 2. In the embodiments shown here, this is done in the direction of the preferred emission direction. However, it is also conceivable that the outgoing air flow is directed counter to the emission direction 18, for example, to divert the air from the clearance with the use of a separate fog lamp with a heat transfer medium 3, 20, 30, 40 in the same headlight 1. Also by the particular Provision of the supply of the air flow ensured that despite a swing of the heat conduction always the same fin surface is flowing.
  • the recesses 14, 22, 34 are equipped with a reflector and / or a reflective surface, so that the light output in the direction of the headlight cover disc can be improved.
  • alternative geometric shapes are taking place the cylindrical or semi-cylindrical shape of the heat conducting 3, 20, 30, 40 conceivable, as long as this the purpose of the invention can be met.
  • a non-inventive headlamp 50 essentially comprises a headlamp housing 60 with a translucent headlamp lens 51, in which a lighting assembly 61 is housed.
  • the light assembly 61 essentially comprises a light-emitting diode arrangement 54 with a fan housing 52.
  • a lens 53 is mounted, which is held by a frame 55.
  • a heat sink 56 is provided, which projects into the fan housing 52 and is flown by a fan 58 with cooling air.
  • the heat conducting means on cooling fins 62 which extend in the direction of flow along the heat conducting 56.
  • an airflow guide 57 in the form of a housing wall can be provided, with which at least part of the airflow generated by the fan 58 is supplied to the heat sink 56.
  • a heat exchanger 63 may be provided for preheating or for cooling the circulating air stream 59, for example, when the heat conducting means 56 has not yet reached its target temperature, or the air temperature is too high to ensure a suitable cooling of the heat conducting.
  • a circulating air stream 59 is shown. It is also conceivable air flow, which is led out at any point from the headlamp, as long as the heat exchanger 63 can act in the manner described on the air flow.

Abstract

Disclosed is a headlight (1) comprising a light emitting diode arrangement (2) with heat-conducting means. Said heat-conducting means is provided with air-conducting means which direct the discharged air flow (5) in a direction that runs parallel to the preferred direction of emission (18) of the generated light. Also disclosed is a headlight comprising a heat exchanger (63) which selectively delivers or withdraws heat to or from the air flow (59) that can enter in contact with the cover pane (50) of the headlight. The invention further relates to a headlight (70) comprising a housing (71) for accommodating two light emitting diode arrangements (72, 77), to each of which one respective cooling element (73, 78) is assigned. A fan (79) is provided for generating an air flow used for cooling the cooling elements (73, 78) while at least one deflection blade (74) is provided that encompasses at least two sections (75, 76), the first section (75) directing a partial air flow onto the first cooling element (73) and the second section (76) deflecting a partial air flow onto the second cooling element (78).

Description

STAND DER TECHNIKSTATE OF THE ART

Die vorliegende Erfindung betrifft einen Scheinwerfer für ein Kraftfahrzeug gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a headlight for a motor vehicle according to the preamble of claim 1.

Ein Scheinwerfer mit einer Leuchtdiodenanordnung ist beispielsweise aus dem deutschen Gebrauchsmuster DE 201 15 772 U1 bekannt. Hier ersetzt eine Anordnung aus Leuchtdioden eine herkömmliche Halogenlampe.A headlamp with a light-emitting diode arrangement is for example from the German utility model DE 201 15 772 U1 known. Here, an array of LEDs replaced a conventional halogen lamp.

In diesem Zusammenhang ist weiterhin bekannt, dass insbesondere leistungsstarke Leuchtdioden eine hohe Verlustwärme produzieren, wobei die Effizienz der Leuchtdioden ab einer bestimmten Schwellentemperatur von ca. 120° C rapide abnimmt.In this context, it is furthermore known that, in particular, powerful light-emitting diodes produce a high heat loss, with the efficiency of the light-emitting diodes rapidly decreasing from a specific threshold temperature of approximately 120 ° C.

Aus diesem Grund ist die Leuchtdiodenanordnung mit Wärmeleitmittel, beispielsweise einem Kühlkörper versehen, der die Wärme der Leuchtdioden in geeigneter Weise abführen kann.For this reason, the light-emitting diode array is provided with heat conducting means, for example a heat sink, which can dissipate the heat of the light emitting diodes in a suitable manner.

Nunmehr stellt sich jedoch das Problem, dass beispielsweise weiße Leuchtdioden keinerlei Infrarotstrahlung erzeugen, die jedoch bei konventionellen Scheinwerfern durch die Halogenlichtquelle erzeugt wird und zum Abtauen bzw. Enteisen der Scheinwerferabschlussscheibe benutzt werden kann.Now, however, there is the problem that, for example, white light emitting diodes produce no infrared radiation, which is generated in conventional headlamps by the halogen light source and can be used to defrost or defrost the headlight cover disc.

Dokument DE 102 27720 A1 offenbart einen Scheinwerper gemäß dem Oberbegriff des Anspruchs 1.document DE 102 27720 A1 discloses a headlamp according to the preamble of claim 1.

Demnach ist es eine Aufgabe der vorliegenden Erfindung, einen Scheinwerfer mit einer Leuchtdiodenanordnung als Hauptlichtquelle bereitzustellen, dessen Scheinwerferabschlussscheibe eis- und beschlagfrei gehalten werden kann.Accordingly, it is an object of the present invention to provide a headlamp with a light emitting diode array as a main light source, the headlight cover plate can be kept ice and fog free.

VORTEILE DER ERFINDUNGADVANTAGES OF THE INVENTION

Erfindungsgemäß wird diese Aufgabe durch einen Scheinwerfer mit den Merkmalen des Anspruchs 1 gelöst. Dadurch, dass das Wärmeleitmittel mit mindestens einem Luftleitmittel ausgestattet ist, das dazu geeignet ist, den abgehenden Luftstrom in eine Richtung parallel zu der bevorzugten Abstrahlrichtung des abgegebenen Lichtes zu lenken, wird die eigens von den Leuchtdioden erzeugte Wärme statt der von üblichen Halogenlampen ausgesandten Infrarotstrahlung zur Enteisung der Scheinwerferabschlussscheibe ausgenutzt, wobei jedoch im Wesentlichen keine konstruktiven Veränderungen vorgenommen werden müssen um die Wärme, analog zur Infrarotstrahlung einer Halogenlampe, stets in Richtung der bevorzugten Abstrahlrichtung zu transportieren.According to the invention this object is achieved by a headlamp with the features of claim 1. Characterized in that the heat conducting means is equipped with at least one air guide, which is adapted to direct the outgoing air flow in a direction parallel to the preferred direction of emission of the emitted light, the heat generated by the light-emitting diodes instead of the infrared radiation emitted by conventional halogen lamps to De-icing the headlight cover disc exploited, but essentially no structural changes must be made to the heat, analogous to the infrared radiation of a halogen lamp, always to transport in the direction of the preferred direction of radiation.

Es ist vorgesehen, dass ein Gehäuse zur Aufnahme des Wärmeleitmittels vorgesehen ist, welches eine Schwenkaufnahme für das Wärmeleitmittel ausbildet in der das Wärmeleitmittel schwenkbar aufgenommen ist, wobei das Gehäuse den Kühlkörper zumindest abschnittsweise im Bereich einer Öffnung die zur Anströmung des Wärmeleitmittels mit dem eingehenden Luftstrom geeignet ist, umschließt. Durch eine derartige Ausgestaltung des Gehäuses, insbesondere dadurch, dass das Gehäuse den Kühlkörper im Bereich der Öffnung umschließt, kann sichergestellt werden, dass die angeströmte Rippenfläche unabhängig vom Schwenkwinkel des Wärmeleitmittels ist.It is envisaged that a housing is provided for receiving the heat conduction, which forms a pivot receptacle for the heat conduction in which the heat conduction is pivotally received, the housing the heat sink at least partially in the region of an opening suitable for the flow of the heat conduction with the incoming air flow is, encloses. By such a configuration of the housing, in particular by the fact that the housing encloses the heat sink in the region of the opening, it can be ensured that the flowed-rib surface is independent of the pivot angle of the heat-conducting.

In einer vorteilhaften Ausgestaltung der vorliegenden Erfindung kann vorgesehen sein, dass das Wärmeleitmittel zumindest abschnittsweise eine zylinderförmige Gestalt aufweist, wobei ein Kern vorgesehen ist, von dem sich Kühlrippen in radialer Richtung erstrecken, wobei die Zwischenräume der Kühlrippen Luftleitkanäle bilden. Eine derartige Ausgestaltung des Wärmeleitmittels ist kompakt und eignet sich in besonders vorteilhafter Weise um einen erwärmten abgehenden Luftstrom zu bilden, der parallel zu der bevorzugten Abstrahlrichtung der Leuchtdiodenanordnung ausgerichtet ist.In an advantageous embodiment of the present invention can be provided that the heat conducting means at least partially has a cylindrical shape, wherein a core is provided, from which cooling fins extend in the radial direction, wherein the interstices of the cooling fins form Luftleitkanäle. Such a configuration of the heat conduction is compact and is particularly advantageously designed to form a heated outgoing air flow, which is aligned parallel to the preferred emission direction of the light emitting diode array.

In einer vorteilhaften Ausgestaltung der vorliegenden Erfindung kann vorgesehen sein, dass sich die Kühlrippen in Längsrichtung des Wärmeleitmittels erstrecken, wobei der Kern über eine Aussparung verfügt, die zur Aufnahme der Leuchtdiodenanordnung geeignet ist. Hier wird das Wärmeleitmittel ebenfalls als Aufnahmemittel für die Leuchtdiodenanordnung verwendet, wodurch sich eine sehr kompakte Ausführungsform des Scheinwerfers ergibt.In an advantageous embodiment of the present invention can be provided that extend the cooling fins in the longitudinal direction of the heat conducting, wherein the core has a recess which is suitable for receiving the light emitting diode array. Here, the heat-conducting is also used as a receiving means for the light-emitting diode array, whereby a very compact embodiment of the headlight results.

Zur Optimierung der Luftströmung kann vorteilhafterweise vorgesehen sein, dass der Kern eine kegelförmige Gestalt aufweist. Dementsprechend kann das Wärmeleitmittel von der spitzen Seite des Kerns angeströmt werden, wobei sich durch die stromlinienförmige Gestalt des Kerns ein vorteilhaftes druckverlustarmes Strömungsverhalten ergibt.To optimize the air flow can advantageously be provided that the core has a conical shape. Accordingly, the heat-conducting medium can be flowed in from the pointed side of the core, whereby the streamlined shape of the core results in an advantageous low-pressure flow behavior.

Auch kann vorteilhafterweise vorgesehen sein, dass das Wärmeleitmittel um seine Längsachse drehbar ist und zumindest abschnittsweise eine halbzylindrische Form aufweist, wobei sich die Kühlrippen in Umfangsrichtung erstrecken und der Kern über eine Aussparung verfügt, die zur Aufnahme der Leuchtdiodenanordnung geeignet ist. Eine derartige Anordnung eignet sich vorzüglich für eine beispielsweise drehbare Ausgestaltung der Kombination aus Kühlkörper und Leuchtdiodenanordnung. Wird beispielsweise das Wärmeleitmittel um seine Längsachse verdreht, so ändert sich das Anströmprofil des Wärmeleitmittels nicht wesentlich, da die Kühlrippen in Umfangsrichtung bzw. in Drehrichtung angeordnet sind. Auf diese Weise kann ein Kurvenfolgescheinwerfer oder die Neigungsverstellung eines Scheinwerfers bei gleichzeitig vorteilhaftem Luftströmungsverhalten realisiert werden.It may also be advantageously provided that the heat conducting means is rotatable about its longitudinal axis and at least partially has a semi-cylindrical shape, wherein the cooling ribs extend in the circumferential direction and the core has a recess which is suitable for receiving the light emitting diode array. Such an arrangement is particularly suitable for example rotatable embodiment of the combination of heat sink and light emitting diode array. If, for example, the heat conducting means is rotated about its longitudinal axis, the inflow profile of the heat conducting means does not change significantly, since the cooling fins are arranged in the circumferential direction or in the direction of rotation. In this way, a Kurvenfolgeweinwerfer or the tilt adjustment of a headlamp can be realized with simultaneous advantageous air flow behavior.

In einer bevorzugten Ausführungsform der vorliegenden Erfindung kann vorgesehen sein, dass das Wärmeleitmittel eine quaderförmige Gestalt aufweist, wobei das Wärmeleitmittel über eine Deckelplatte verfügt von der Kühlrippen abgehen, deren Zwischenräume Luftleitkanäle zum Leiten des abgehenden Luftstroms bilden, wobei die Deckelplatte zur Aufnahme der Leuchtdiodenanordnung geeignet ist, wobei ein optisches Umlenkmittel vorgesehen ist, welches dazu geeignet ist, das von der Leuchtdiodenanordnung erzeugte Licht in eine Richtung parallel zu dem abgehenden Luftstrom umzulenken. Bei dieser Variante der Wärmeleitmittelausführung kommt ein quaderförmiger Kühlkörper zum Einsatz, der einfach zu bearbeiten und in großen Mengen als Halbzeug preiswert verfügbar ist.In a preferred embodiment of the present invention, it can be provided that the heat conducting means has a cuboid shape, the heat conducting means having a cover plate departing from the cooling fins, whose interspaces form air guide channels for conducting the outgoing air flow, wherein the cover plate is suitable for receiving the light emitting diode arrangement , wherein an optical deflection means is provided, which is adapted to the light generated by the light emitting diode assembly in one direction to divert parallel to the outgoing airflow. In this variant of Wärmeleitmitteltausführung a cuboid heat sink is used, which is easy to edit and inexpensive available in large quantities as a semi-finished product.

In einer weiteren vorteilhaften Ausgestaltung der vorliegenden Erfindung kann vorgesehen sein, dass das Wärmeleitmittel von einem Wärmeleitmittelgehäuse umschlossen ist, welches über Haltestege verfügt, die zur Aufnahme einer Linse oder eines Schatters vor der Leuchtdiodenanordnung geeignet sind.
Abgesehen davon, dass der Luftstrom durch das Wärmeleitmittelgehäuse weiter kanalisiert werden kann, so trägt die Anordnung von Haltestegen an dem Wärmeleitmittelgehäuse weiterhin zu einer kompakten Bauform des Scheinwerfers bei.In a further advantageous embodiment of the present invention can be provided that the heat conducting means is enclosed by a Wärmeleitmittelgehäuse, which has holding webs which are suitable for receiving a lens or a raster in front of the light emitting diode array.
Apart from the fact that the air flow through the Wärmeleitmittelgehäuse can be further channeled, the arrangement of retaining webs on the Wärmeleitmittelgehäuse continues to contribute to a compact design of the headlamp.

Auch kann vorteilhafterweise vorgesehen sein, dass die Aussparung mit einem Reflektor ausgestattet ist und/oder eine reflektierende Oberfläche aufweist. Hierdurch wird eine gute Lichtausbeute in Richtung der bevorzugten Abstrahlrichtung erreicht.It can also be advantageously provided that the recess is equipped with a reflector and / or has a reflective surface. As a result, a good light output in the direction of the preferred emission direction is achieved.

In einer vorteilhaften Ausgestaltung der vorliegenden Erfindung kann weiterhin vorgesehen sein, dass ein Wärmetauscher vorgesehen ist, der dazu geeignet ist, dem Luftstrom wahlweise Wärme zuzuführen oder zu entziehen. Hierdurch kann in geeigneter Weise regulierend auf die Temperatur des Luftstroms Einfluss genommen werden, beispielsweise kann der Luftstrom zur schnelleren Erwärmung vorgeheizt oder aber zusätzlich bei extrem hohen Außentemperaturen abgekühlt werden.In an advantageous embodiment of the present invention may further be provided that a heat exchanger is provided which is adapted to selectively supply heat to the air flow or to withdraw. As a result, it is possible to influence the temperature of the air flow in a suitable manner in a suitable manner, for example by preheating the air flow for faster heating or, in addition, cooling it at extremely high outside temperatures.

Vorteilhafterweise kann vorgesehen sein, dass das Wärmeleitmittel dazu geeignet ist, den abgehenden Luftstrom in Richtung der bevorzugten Abstrahlrichtung des abgegebenen Lichtes zu lenken.Advantageously, it can be provided that the heat conducting means is suitable for directing the outgoing air flow in the direction of the preferred emission direction of the emitted light.

Entsprechend kann alternativ kann weiterhin vorteilhafterweise vorgesehen sein, dass der Scheinwerfer mit einem weiteren Wärmeleitmittel ausgestattet ist, welches dazu geeignet ist, einen abgehenden Luftstrom entgegen der bevorzugten Abstrahlrichtung des abgegebenen Lichtes zu lenken. Dementsprechend kann durch eine Kombination derartiger Wärmeleitelemente sowohl eine Luftzufuhr als auch Luftabfuhr aus dem Lichtraum erreicht werden. Denkbar ist eine derartige Kombination beispielsweise bei einem Scheinwerfer, der mit einem Abblendlicht und einem Nebelscheinwerfer und/oder separatem Fernlicht ausgestattet ist. Hier kann dann der Luftstrom in der erfindungsgemäßen Weise beispielsweise über das Wärmeleitmittel des Nebelscheinwerfers abgeführt werden. Aus der EP 0 859 188 A2 ist ein Scheinwerferbetauungsschutz bekannt, bei dem ein Luftstrom mit der Scheinwerferscheibe in Kontakt treten und eine Kondensation auf optischen Oberflächen vermieden werden kann. In einer vorteilhaften Ausgestaltung dieses Scheinwerferbetauungsschutzes soll ein separates Heizelement, beispielsweise ein Heizdraht vorgesehen sein, welches den Luftstrom vorheizen kann.Accordingly, alternatively, it can furthermore advantageously be provided that the headlight is equipped with a further heat conducting means which is suitable for directing an outgoing air flow against the preferred emission direction of the emitted light. Accordingly, both a supply of air and air removal from the light space can be achieved by a combination of such heat-conducting elements. Such a combination is conceivable, for example, in a headlight that is equipped with a dipped beam and a fog light and / or separate high beam. Here then the air flow in the manner according to the invention can be dissipated, for example, via the heat conducting means of the fog light. From the EP 0 859 188 A2 a headlamp protection is known, in which an air flow with the headlight disc come into contact and condensation on optical surfaces can be avoided. In an advantageous embodiment of this Scheinwerferbetauungsschutzes a separate heating element, for example, a heating wire to be provided, which can preheat the air flow.

Es ist weiterhin bekannt, die Leuchtdiodenanordnung mit einem Wärmeleitmittel auszustatten und den Luftstrom durch die abgegebene Wärme der Leuchtdiodenanordnung zu erwärmen. Hierdurch kann auf die Verwendung eines separaten Heizelements verzichtet werden.It is also known to provide the light-emitting diode arrangement with a heat conducting means and to heat the air flow through the heat emitted by the light emitting diode arrangement. This makes it possible to dispense with the use of a separate heating element.

Wird jedoch die Abwärme der Leuchtdiodenanordnung zur Erwärmung des Luftstroms verwendet, so ergeben sich unterschiedliche Probleme. Insbesondere ist die Wärmequelle als solche nicht regulierbar, denn die Hauptaufgabe der Leuchteinrichtung liegt immer noch darin, als Lichtquelle zu fungieren. Insbesondere bei extrem hohen, aber auch bei extrem niedrigen Umgebungstemperaturen ergeben sich in diesem Fall Probleme, da die Leuchtmittel beispielsweise nicht ausreichend gekühlt werden können oder aber viel zu lange brauchen um eine ausreichende Wärme zur Enteisung der Scheinwerferabschlussscheibe zur Verfügung zu stellen.However, if the waste heat of the LED array used to heat the air flow, so there are different problems. In particular, the heat source as such is not adjustable, because the main task of the lighting device is still to act as a light source. In particular, at extremely high, but also at extremely low ambient temperatures arise in this case problems, since the bulbs can not be sufficiently cooled, for example, or too long to provide sufficient heat to de-ice the headlight cover disc available.

ZEICHNUNGENDRAWINGS

Weitere Merkmale und Vorteile der vorliegenden Erfindung werden deutlich anhand der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die beiliegenden Abbildungen. Darin zeigen

Fig. 1
ein erfindungsgemäßer Scheinwerfer in einer seitlichen Schnittansicht;
Fig. 2
ein Wärmeleitmittel eines erfindungsgemäßen Scheinwerfers in einer perspektivischen Schnittansicht;
Fig. 3
eine alternative Ausführungsform eines Wärmeleitmittels in einer teilweise geschnittenen perspektivischen Ansicht;
Fig. 4
eine alternative Ausführungsform eines Wärmeleitmittels in einer teilweise geschnittenen perspektivischen Ansicht;
Fig. 5
ein nicht erfindungsgemäßer Scheinwerfer;
Fig. 6
ein nicht erfindungsgemäßer Scheinwerfer;
Fig. 7
eine perspektivische Darstellung eines Scheinwerfers gemäß Fig. 6.
Further features and advantages of the present invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. Show in it
Fig. 1
an inventive headlamp in a side sectional view;
Fig. 2
a heat conducting means of a headlamp according to the invention in a perspective sectional view;
Fig. 3
an alternative embodiment of a heat conduction in a partially sectioned perspective view;
Fig. 4
an alternative embodiment of a heat conduction in a partially sectioned perspective view;
Fig. 5
a non-inventive headlight;
Fig. 6
a non-inventive headlight;
Fig. 7
a perspective view of a headlamp according to Fig. 6 ,

BESCHREIBUNG DER AUSFÜHRUNGSBEISPIELEDESCRIPTION OF THE EMBODIMENTS

Zunächst wird auf Fig. 1 Bezug genommen.First, it will open Fig. 1 Referenced.

Ein erfindungsgemäßer Scheinwerfer 1 umfasst im Wesentlichen ein zylinderförmiges Wärmeleitmittelgehäuse 8, in dem ein Kühlkörper 3 mit einer Leuchtdiodenanordnung 2 untergebracht ist. Das Wärmeleitmittelgehäuse 8 ist einseitig mit Haltestegen 16 ausgestattet, die als Aufnahme für eine Linse 17 oder einen Schatter dienen, wobei das Licht der Leuchtdiodenanordnung 2 über die Linse 17 auf eine Scheinwerferabschlussscheibe projiziert wird.An inventive headlight 1 essentially comprises a cylindrical heat conducting means housing 8, in which a cooling body 3 is accommodated with a light emitting diode arrangement 2. The Wärmeleitmittelgehäuse 8 is provided on one side with support webs 16, which serve as a receptacle for a lens 17 or a shader, wherein the light of the LED array 2 is projected via the lens 17 onto a headlight cover lens.

Das Wärmeleitmittel 3 selbst weist eine zylindrische Form mit einem massiven Kern 13 auf, wobei sich Kühlrippen 10 in radialer Richtung entlang einer Längsachse 11 des Wärmeleitmittels 3 von dem massiven Kern 13 erstrecken und in dieser Ausführungsform zusammen mit dem Wärmeleitmittelgehäuse 8 eine Anzahl von Luftleitkanälen 12 bilden, die im Wesentlichen in Richtung der Linse 17 bzw. der Scheinwerferabschlussscheibe ausgerichtet sind. Die Luftleitkanäle 12 werden jedoch auch gebildet, wenn kein Wärmeleitmittelgehäuse 8 vorgesehen ist.The heat conducting means 3 itself has a cylindrical shape with a solid core 13, wherein cooling fins 10 extend in the radial direction along a longitudinal axis 11 of the heat conducting means 3 from the solid core 13 and in this embodiment form a number of air guide channels 12 together with the heat conducting means housing 8 , which are aligned substantially in the direction of the lens 17 and the headlight cover disk. However, the air ducts 12 are also formed when no Wärmeleitmittelgehäuse 8 is provided.

Das Wärmeleitmittel 3 ist rotationssymmetrisch um sein Längsachse 11 ausgestaltet. Zur Aufnahme der Leuchtdiodenanordnung 2 weist das Wärmeleitmittel 3 eine konische Aussparung 14 innerhalb des massiven Kerns 13 auf, wobei sich die konische Aussparung 14 in den Bereich der Kühlrippen 10 fortsetzen kann. Vorteilhafterweise fällt die optische Achse der Leuchtdiodenanordnung 2 mit der Längsachse 11 des Wärmeleitmittels 3 zusammen.The heat conducting means 3 is designed rotationally symmetrical about its longitudinal axis 11. For receiving the light-emitting diode arrangement 2, the heat-conducting means 3 has a conical recess 14 within the solid core 13, wherein the conical recess 14 can continue into the region of the cooling ribs 10. Advantageously, the optical axis of the light emitting diode arrangement 2 coincides with the longitudinal axis 11 of the heat conducting means 3.

Während des Betriebes gibt die Leuchtdiodenanordnung 2 nunmehr Wärme an das Wärmeleitmittel 3 ab. Aus einer nicht weiter dargestellten Kühlluftquelle, beispielsweise einem Gebläse, erreicht den Kühlkörper 3 ein eingehender Kühlluftstrom 4, der durch die Luftkanäle 12 strömt und als erwärmter abgehender Luftstrom 5 die Luftkanäle 12 verlässt, wobei der abgehende Luftstrom 5 im wesentlichen auf die Linse 17 bzw. auf die Scheinwerferabschlussscheibe ausgerichtet ist. Durch diesen erwärmten abgehenden Luftstrom 5 wird die Linse 17 und die Scheinwerferabschlussscheibe 6 in geeigneter Weise aufgewärmt und somit eis- und beschlagfrei gehalten.During operation, the light-emitting diode arrangement 2 now outputs heat to the heat conducting means 3. Out of one illustrated cooling air source, such as a blower, the cooling body 3 reaches a detailed cooling air flow 4, which flows through the air channels 12 and leaves the heated air outflow 5 as the heated outgoing air stream 5, wherein the outgoing air flow 5 substantially aligned with the lens 17 and the headlight cover disc is. By this heated outgoing airflow 5, the lens 17 and the headlight cover disc 6 is warmed up in a suitable manner and thus kept ice and fog free.

Es ist weiterhin vorgesehen, dass die Anordnung aus Wärmeleitmittel 3, Wärmeleitmittelgehäuse 8, samt Linse 17 und Leuchtdiodenanordnung 2 schwenkbar gegenüber einem Tragrahmen 9 ausgestaltet ist. Der Tragrahmen 9 kann Bestandteil des Scheinwerfers 1 sein und weist eine Öffnung 15 auf, durch die der eingehende Luftstrom 4 dem Kühlkörper 3 zugeleitet werden kann. Zum Verschwenken des Wärmeleitmittels 3 ist ein Gestänge 7 vorgesehen, wodurch beispielsweise eine Leuchtweitenregelung und/oder ein Kurvenscheinwerfer realisiert werden kann.It is further contemplated that the arrangement of heat conducting 3, Wärmeleitmittelgehäuse 8, together with the lens 17 and light emitting diode array 2 is pivotally configured relative to a support frame 9. The support frame 9 may be part of the headlight 1 and has an opening 15 through which the incoming air flow 4 can be supplied to the heat sink 3. For pivoting the heat-conducting 3, a linkage 7 is provided, whereby, for example, a headlamp leveling and / or a curve headlight can be realized.

Eine weitere Ausführungsform eines Wärmeleitmittels 20 ist in Fig. 2 dargestellt. Das hier verwendete Wärmeleitmittel 20 weist im Wesentlichen eine halbzylindrische Gestalt auf, wobei das Wärmeleitmittel 20 ebenfalls einen massiven Kern 24 umfasst, um den Kühlrippen 23 radial angeordnet sind. Die Kühlrippen 23 sind jedoch im Gegensatz zu dem Kühlkörper 3 aus Fig. 1 in Umfangsrichtung und nicht in Längsrichtung ausgerichtet. Die Kühlrippen 23 bilden Luftkanäle 25, die von einem eingehenden Luftstrom 4 angeströmt werden können, und das Wärmeleitmittel 20 in einem abgehenden Luftstrom 5 verlassen, der im wesentlichen auf die Scheinwerferabschlussscheibe ausgerichtet ist. In Richtung einer Längsachse 21 des Wärmeleitmittels 20 ist eine Aussparung 22 für die Aufnahme der Leuchtdiodenanordnung 2 vorgesehen, deren optische Achse ebenfalls in Richtung der Scheinwerferabschlussscheibe ausgerichtet ist.Another embodiment of a heat conducting means 20 is shown in FIG Fig. 2 shown. The heat conducting means 20 used here has essentially a semi-cylindrical shape, wherein the heat conducting means 20 likewise comprises a solid core 24, around which the cooling ribs 23 are arranged radially. However, the cooling fins 23 are in contrast to the heat sink 3 from Fig. 1 aligned in the circumferential direction and not in the longitudinal direction. The cooling fins 23 form air channels 25, which can be flown by an incoming air flow 4, and leave the heat conducting means 20 in an outgoing air flow 5, which is substantially aligned with the headlight cover disc. In the direction of a longitudinal axis 21 of the heat conducting means 20, a recess 22 for receiving the light-emitting diode arrangement 2 is provided, whose optical axis is also aligned in the direction of the headlight cover disc.

In Fig. 3 ist eine weitere Ausführungsform eines Wärmeleitmittels 30 dargestellt. Das hier verwendete Wärmeleitmittel 30 ist im Wesentlichen mit dem in Fig. 1 dargestellten Wärmeleitmittel 3 vergleichbar und umfasst einen massiven Kern 31, der radial mit Kühlrippen 32 ausgestattet ist, die in Längsrichtung des Wärmeleitmittels 30 verlaufen und Luftleitkanäle 33 ausbilden. Zur Erzeugung eines möglichst druckverlustarmen Luftstroms weist der massive Kern 31 eine kegelförmige Gestalt auf, wobei der eingehende Luftstrom den Kern 31 von der spitzen Seite anströmt, durch die Luftleitkanäle 25 zwischen den Kühlrippen 32 hindurchgeleitet wird und das Wärmeleitmittel 30 als abgehenden Luftstrom 5 in Richtung der Scheinwerferabschlussscheibe verlässt. Auch hier ist mittig des Wärmeleitmittels 30 eine Aussparung 34 vorgesehen, die als Aufnahme für die Leuchtdiodenanordnung 2 dient.In Fig. 3 a further embodiment of a heat conducting 30 is shown. The heat-conducting agent 30 used here is essentially the same as in FIG Fig. 1 shown heat conduction means 3 and comprises a solid core 31 which is radially equipped with cooling fins 32 extending in the longitudinal direction of the heat conducting 30 and form Luftleitkanäle 33. To produce a low pressure loss possible air flow, the solid core 31 has a conical shape, wherein the incoming air flow flows to the core 31 from the acute side, is passed through the Luftleitkanäle 25 between the cooling fins 32 and the heat conducting 30 as outgoing air flow 5 in the direction of Headlight terminus leaves. Here, too, a recess 34 is provided in the middle of the heat-conducting means 30, which serves as a receptacle for the light-emitting diode arrangement 2.

Eine weitere alternative Ausführungsform eines Wärmeleitmittels 40 ist in Fig. 4 dargestellt. Das Wärmeleitmittel 40 weist eine im Wesentlichen quaderförmige Gestalt auf und ist mit einer Deckelplatte 43 versehen. Von der Deckelplatte 43 erstrecken sich Kühlrippen 41, wobei die Zwischenräume der Kühlrippen 41 Luftleitkanäle 42 bilden. Des Weiteren ist vorgesehen, die Leuchtdiodenanordnung 2 kopfseitig der Deckelplatte 43 anzuordnen und einen Spiegel 44 bzw. ein Prisma zu verwenden, damit das Licht der Leuchtdiodenanordnung 2 in Richtung des abgehenden Luftstroms 5 umgelenkt werden kann, so dass sowohl das Licht der Leuchtdiodenanordnung 2, als auch der erwärmte Luftstrom 5 auf die Scheinwerferabschlussscheibe ausgerichtet werden können.Another alternative embodiment of a heat conducting means 40 is shown in FIG Fig. 4 shown. The heat conducting means 40 has a substantially cuboidal shape and is provided with a cover plate 43. From the cover plate 43, cooling ribs 41 extend, wherein the intermediate spaces of the cooling ribs 41 form air guide channels 42. Furthermore, it is provided to arrange the light-emitting diode arrangement 2 on the head side of the cover plate 43 and to use a mirror 44 or a prism, so that the light of the light-emitting diode arrangement 2 can be deflected in the direction of the outgoing air flow 5, so that both the light of the light-emitting diode arrangement 2, as Also, the heated air flow 5 can be aligned with the headlight cover disc.

Selbstverständlich sind auch die Wärmeleitmittel 20, 30, 40 gemäß der Fig. 2 bis 4 schwenkbar ausgestaltet. Es ist weiterhin vorgesehen, dass das jeweilige Wärmeleitmittel 20, 30, 40 zumindest abschnittsweise von dem Gehäuse 9 umschlossen ist, wobei das Gehäuse 9 jeweils eine Öffnung 15 aufweist, durch welche der eingehende Luftstrom 4 in die Luftleitkanäle 12 einströmen kann. Durch eine derartige Ausgestaltung der Luftzufuhr, kann die Kühlrippenfläche weitgehend unabhängig von dem jeweiligen Schwenkwinkel des Wärmeleitmittels 3, 20, 30, 40 angeströmt werden. Unterstützt wird eine derartige vorteilhafte Anströmung beispielsweise durch ein Wärmeleitmittel 20 nach Fig. 2, bei dem sich die Ausrichtung der Kühlrippen 23 in Bezug auf den eingehenden Luftstrom 4 trotz eines Schwenkens des Wärmeleitmittels 20 um die Längsachse nicht ändert. Alternativ kann beispielsweise auch wie in Fig. 3 eine stromlinienförmige Ausgestaltung des Wärmeleitmittels 30 vorgesehen sein, um eine möglichst druckverlustfreie Luftströmung sicherzustellen. Allen Ausführungsformen des Wärmeleitmittels 3, 20, 30, 40 ist letztendlich gemeinsam, dass der abgehende Luftstrom 5 in eine Richtung parallel zur bevorzugten Abstrahlrichtung 18 des Lichtes der Leuchtdiodenanordnung 2 gelenkt werden kann. In den hier dargestellten Ausführungsformen geschieht dies in Richtung der bevorzugten Abstrahlrichtung. Denkbar ist jedoch weiterhin, dass der abgehende Luftstrom entgegen der Abstrahlrichtung 18 gelenkt wird, beispielsweise zum Ableiten der Luft aus dem Lichtraum bei Verwendung eines separaten Nebelscheinwerfers mit einem erfindungsgemäßen Wärmeleitmittel 3, 20, 30, 40 in demselben Scheinwerfer 1. Auch wird durch die besonderen Vorkehrungen der Zuführung des Luftstromes sichergestellt, das trotz eines Schwenkens des Wärmeleitmittels stets die gleiche Kühlrippenfläche angeströmt wird. Es kann weiterhin vorgesehen sein, dass die Aussparungen 14, 22, 34 mit einem Reflektor und/oder einer reflektierenden Oberfläche ausgestattet sind, so dass die Lichtausbeute in Richtung der Scheinwerferabschlussscheibe verbessert werden kann. Auch sind selbstverständlich alternative geometrische Formen statt der zylinderförmigen bzw. halbzylinderförmigen Gestalt des Wärmeleitmittels 3, 20, 30, 40 denkbar, solange hierdurch der erfindungsgemäße Zweck erfüllt werden kann.Of course, the heat conducting means 20, 30, 40 according to the Fig. 2 to 4 swivel designed. It is Furthermore provided that the respective heat conducting means 20, 30, 40 is at least partially enclosed by the housing 9, wherein the housing 9 each having an opening 15 through which the incoming air flow 4 can flow into the air ducts 12. Such a configuration of the air supply, the cooling fin surface can be largely independent of the respective pivot angle of the heat conducting 3, 20, 30, 40 are flown. Such advantageous flow is supported, for example, by a heat conducting means 20 Fig. 2 in which the orientation of the cooling fins 23 with respect to the incoming air stream 4 does not change despite a pivoting of the heat conducting means 20 about the longitudinal axis. Alternatively, for example, as in Fig. 3 a streamlined configuration of the heat conducting means 30 may be provided in order to ensure a pressure loss-free as possible air flow. All embodiments of the heat conducting means 3, 20, 30, 40 are ultimately common in that the outgoing air flow 5 can be directed in a direction parallel to the preferred emission direction 18 of the light of the light emitting diode arrangement 2. In the embodiments shown here, this is done in the direction of the preferred emission direction. However, it is also conceivable that the outgoing air flow is directed counter to the emission direction 18, for example, to divert the air from the clearance with the use of a separate fog lamp with a heat transfer medium 3, 20, 30, 40 in the same headlight 1. Also by the particular Provision of the supply of the air flow ensured that despite a swing of the heat conduction always the same fin surface is flowing. It may further be provided that the recesses 14, 22, 34 are equipped with a reflector and / or a reflective surface, so that the light output in the direction of the headlight cover disc can be improved. Of course, alternative geometric shapes are taking place the cylindrical or semi-cylindrical shape of the heat conducting 3, 20, 30, 40 conceivable, as long as this the purpose of the invention can be met.

In Fig. 5 ist eine Ausführungsform eines nicht erfindungsgemäßen Scheinwerfers 50 dargestellt. Ein nicht erfindungsgemäßer Scheinwerfer 50 umfasst im Wesentlichen ein Scheinwerfergehäuse 60 mit einer lichtdurchlässigen Scheinwerferabschlussscheibe 51, in dem eine Leuchtanordnung 61 untergebracht ist.In Fig. 5 an embodiment of a non-inventive headlamp 50 is shown. A non-inventive headlamp 50 essentially comprises a headlamp housing 60 with a translucent headlamp lens 51, in which a lighting assembly 61 is housed.

Die Leuchtanordnung 61 umfasst im Wesentlichen eine Leuchtdiodenanordnung 54 mit einem Lüftergehäuse 52. Vor der Leuchtdiodenanordnung 54 ist eine Linse 53 angebracht, die von einem Rahmen 55 gehalten wird. Zur Kühlung der Leuchtdiodenanordnung 54 ist ein Kühlkörper 56 vorgesehen, der in das Lüftergehäuse 52 hineinragt und von einem Lüfter 58 mit Kühlluft angeströmt wird. Dabei weist das Wärmeleitmittel Kühlrippen 62 auf, die sich in Anströmrichtung längs des Wärmeleitmittels 56 erstrecken. Es kann weiterhin eine Luftstromführung 57 in Form einer Gehäusewandung vorgesehen sein, mit welcher zumindest ein Teil des von dem Lüfter 58 erzeugten Luftstroms dem Kühlkörper 56 zugeführt wird.The light assembly 61 essentially comprises a light-emitting diode arrangement 54 with a fan housing 52. In front of the light-emitting diode arrangement 54, a lens 53 is mounted, which is held by a frame 55. For cooling the light-emitting diode arrangement 54, a heat sink 56 is provided, which projects into the fan housing 52 and is flown by a fan 58 with cooling air. In this case, the heat conducting means on cooling fins 62, which extend in the direction of flow along the heat conducting 56. Furthermore, an airflow guide 57 in the form of a housing wall can be provided, with which at least part of the airflow generated by the fan 58 is supplied to the heat sink 56.

Der Lüfter 58 ist in der hier dargestellten bevorzugten Ausführungsform derart angeordnet, dass ein zirkulierender Luftstrom 59 innerhalb des Gehäuses 60 erzeugt wird, der zunächst die von dem Kühlkörper 56 abgegebene Wärme aufnehmen kann, um anschließend an der Scheinwerferabschlussscheibe 51 abgekühlt zu werden. Hierdurch kann die Scheinwerferabschlussscheibe 51 trotz fehlendem infraroten Lichtanteil der Leuchtdiodenanordnung 54 eis- und beschlagfrei gehalten werden.The fan 58 is arranged in the preferred embodiment shown here such that a circulating air flow 59 is generated within the housing 60, which can first absorb the heat emitted by the heat sink 56 to be subsequently cooled on the headlight cover disk 51. As a result, the headlight cover disk 51 can be kept ice-free and fog-free despite the lack of an infrared light component of the light-emitting diode arrangement 54.

Ein Wärmetauscher 63 kann zur Vorheizung bzw. zur Abkühlung des zirkulierenden Luftstroms 59 vorgesehen sein, beispielsweise wenn das Wärmeleitmittel 56 seine Solltemperatur noch nicht erreicht hat, oder aber die Lufttemperatur zu hoch ist um ein geeignetes Abkühlen des Wärmeleitmittels sicherzustellen. In der hier dargestellten Ausführungsform ist ein zirkulierender Luftstrom 59 dargestellt. Denkbar ist auch ein Luftstrom, der an beliebiger Stelle aus dem Scheinwerfer herausgeführt wird, solange der Wärmetauscher 63 in der beschriebenen Weise auf den Luftstrom einwirken kann.A heat exchanger 63 may be provided for preheating or for cooling the circulating air stream 59, for example, when the heat conducting means 56 has not yet reached its target temperature, or the air temperature is too high to ensure a suitable cooling of the heat conducting. In the embodiment shown here, a circulating air stream 59 is shown. It is also conceivable air flow, which is led out at any point from the headlamp, as long as the heat exchanger 63 can act in the manner described on the air flow.

Eine weitere Ausführungsform eines nicht erfindungsgemäßen Scheinwerfers 70 ist in Fig. 6 und 7 dargestellt. Der Scheinwerfer 70 umfasst ein Gehäuse 71, in dem mindestens eine Umlenkschaufel 75 und ein Lüfter 79 vorgesehen ist. Des Weiteren ist der Scheinwerfer 70 mit einer ersten Leuchtdiodenanordnung 72 mit einem zugeordneten ersten Kühlkörper 73 und einer zweiten Leuchtdiodenanordnung 77 mit einem zugeordneten zweiten Kühlkörper 78 ausgestattet, wobei sowohl die Kühlkörperanordnungen 73, 78, wie auch der Luftstrom des Lüfters 79 in das Gehäuse 71 gerichtet sind.Another embodiment of a non-inventive headlamp 70 is shown in FIG Fig. 6 and 7 shown. The headlight 70 comprises a housing 71, in which at least one turning vane 75 and a fan 79 is provided. Furthermore, the headlight 70 is equipped with a first light-emitting diode arrangement 72 having an associated first heat sink 73 and a second light-emitting diode arrangement 77 with an associated second heat sink 78, wherein both the heat sink arrangements 73, 78 and the air flow of the fan 79 are directed into the housing 71 are.

Um die Leuchtdiodenanordnungen 72, 77 optimal kühlen zu können, ist eine Umlenkschaufel 74 vorgesehen, die dazu geeignet ist den Luftstrom des Lüfters 79 in zwei separate Luftströme aufzuteilen, die jeweils dem ersten Kühlkörper 73 bzw. dem zweiten Kühlkörper 78 zielgenau zugeführt werden können. Hierzu ist die Umlenkschaufel 74 in einen ersten Abschnitt 75 bzw. einen zweiten Abschnitt 76 aufgeteilt, wobei die Abschnitte 75, 76 über geeignete Luftleitmittel verfügen um die Aufteilung des Luftstroms in der oben beschriebenen Weise vorzunehmen.In order to be able to optimally cool the light-emitting diode arrangements 72, 77, a deflection vane 74 is provided, which is suitable for dividing the air flow of the fan 79 into two separate air streams, which can be supplied precisely to the first heat sink 73 and the second heat sink 78, respectively. For this purpose, the deflecting blade 74 is divided into a first section 75 and a second section 76, wherein the sections 75, 76 have suitable air guiding means to make the division of the air flow in the manner described above.

Claims (11)

  1. Headlamp (1) for a motor vehicle, comprising
    - a light-emitting diode arrangement (2) with a preferred direction of emission (18) of the emitted light,
    - a heat-conducting means (3, 20, 30, 40) for transferring heat between the light-emitting diode arrangement (2) and an air flow (4, 5), wherein an incoming air flow (4) can flow against the heat-conducting means and an outgoing air flow (5) can flow out of the heat-conducting means,
    - a transparent headlamp cover lens that is arranged in the preferred direction of emission (18) of the light, wherein
    - the heat-conducting means (3, 20, 30, 40) is equipped with at least one air-conducting means that is suitable for guiding the outgoing air flow (5) in a direction parallel to the preferred direction of emission (18) of the emitted light,
    characterized in that
    a housing (9) is provided for holding the heat-conducting means (3, 20, 30, 40), wherein this housing forms a pivot mount for the heat-conducting means, with the heat-conducting means being held in the pivot mount so that the heat-conducting means can pivot, wherein the housing (9) surrounds the heat-conducting means at least in some regions, and wherein the housing (9) is equipped with an opening (15) that allows the incoming air flow (4) to flow against the heat-conducting means.
  2. Headlamp according to Claim 1, characterized in that the heat-conducting means (3, 20, 30, 40) has a cylindrical shape at least in some regions, wherein a core (13, 24, 31) is provided, with cooling ribs (10, 23, 32) extending from this core in the radial direction, wherein the spaces between the cooling ribs form air-conducting channels (12, 25, 33) as the air-conducting means.
  3. Headlamp according to Claim 2, characterized in that the cooling ribs (10, 23, 32) extend in the longitudinal direction of the heat-conducting means (3, 20, 30, 40), wherein the core (13, 24, 31) has a recess (14, 22, 34) that is suitable for holding the light-emitting diode arrangement (2).
  4. Headlamp according to Claim 2 or 3, characterized in that the core (31) has a conical shape.
  5. Headlamp according to Claim 2, characterized in that the heat-conducting means (20) can rotate about its longitudinal axis and has a semi-cylindrical form at least in some regions, wherein the cooling ribs (23) extend in the circumferential direction and the core (24) has a recess that is suitable for holding the light-emitting diode arrangement (2).
  6. Headlamp according to Claim 1, characterized in that the heat-conducting means (40) has a block-shaped form, wherein the heat-conducting means (40) has a cover plate (43) from which cooling ribs (41) extend, with the spaces between these ribs forming air-conducting channels (42) for guiding the outgoing air flow (5), wherein the cover plate (43) is suitable for holding the light-emitting diode arrangement (2), wherein an optical deflection means is provided that is suitable for deflecting the light generated by the light-emitting diode arrangement (2) in the direction of the outgoing air flow (5).
  7. Headlamp according to one of Claims 1 to 6, characterized in that the heat-conducting means (3, 20, 30, 40) is surrounded by a heat-conducting-means housing (8) that has retaining ribs (16) suitable for holding a lens (17) or a shade in front of the light-emitting diode arrangement (2).
  8. Headlamp according to one of Claims 3 to 7, characterized in that the recess (14, 22, 34) is equipped with a reflector and/or has a reflective surface.
  9. Headlamp according to one of Claims 1 to 8, characterized in that a heat exchanger (63) is provided that is suitable for selectively supplying heat to or drawing heat away from the air flow (4, 5).
  10. Headlamp according to one of Claims 1 to 9, characterized in that the heat-conducting means (3, 20, 30, 40) is suitable for guiding the outgoing air flow (5) in the direction of the preferred direction of emission (18) of the emitted light.
  11. Headlamp according to one of Claims 1 to 10, characterized in that the headlamp is equipped with another heat-conducting means (3, 20, 30, 40) that is suitable for guiding an outgoing air flow (5) against the preferred direction of emission (18) of the emitted light.
EP05740258A 2004-05-25 2005-05-12 Headlight for a motor vehicle Expired - Fee Related EP1749170B1 (en)

Applications Claiming Priority (2)

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DE102004025623A DE102004025623A1 (en) 2004-05-25 2004-05-25 Headlight for a motor vehicle
PCT/EP2005/052157 WO2005116520A1 (en) 2004-05-25 2005-05-12 Headlight for motor vehicles

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EP1749170A1 EP1749170A1 (en) 2007-02-07
EP1749170B1 true EP1749170B1 (en) 2012-04-11

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AT (1) ATE553334T1 (en)
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WO (1) WO2005116520A1 (en)

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EP1749170A1 (en) 2007-02-07
DE102004025623A1 (en) 2005-12-15
ATE553334T1 (en) 2012-04-15

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