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

• the present invention relates to a headlight for a motor vehicle according to the preamble of claim 1 and claim 13, and a headlight for a motor vehicle according to the preamble of claim 18.
• a headlight with a light-emitting diode arrangement is known, for example, from German utility model DE 201 15 772 ul.
• an arrangement of light-emitting diodes replaces a conventional halogen lamp.
• the light-emitting diode arrangement 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.
• heat-conducting means for example a heat sink
• white light-emitting diodes do not generate any infrared radiation, which, however, is generated by the halogen light source in conventional headlights and can be used to defrost or defrost the headlight lens.
• a headlight with the characterizing features of claim 1. Because the heat conducting means is equipped with at least one air conducting means, which is suitable for directing 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 becomes De-icing of the headlight lens is used, but essentially no design changes have to be made to always transport the heat, analogous to the infrared radiation of a halogen lamp, in the direction of the preferred radiation direction.
• the heat conducting means has a cylindrical shape, at least in sections, wherein a core is provided, from which cooling fins extend in the radial direction, the spaces between the cooling fins forming air guiding channels.
• a configuration of the heat conducting means is compact and is particularly suitable for forming a heated outgoing air flow which is aligned parallel to the preferred direction of emission of the light-emitting diode arrangement.
• the cooling ribs extend in the longitudinal direction of the heat-conducting medium, the core having a cutout which is suitable for receiving the light-emitting diode arrangement.
• the heat conducting means is also used as a receiving means for the light-emitting diode arrangement, whereby there is a very compact embodiment of the headlamp.
• the core has a conical shape. Accordingly, the heat-conducting medium can flow from the tip side of the core, the streamlined shape of the core resulting in advantageous flow behavior with little pressure loss.
• the heat-conducting means to be rotatable about its longitudinal axis and to have a semi-cylindrical shape at least in sections, the cooling fins extending in the circumferential direction and the core having a cutout which accommodates the
• LED arrangement is suitable.
• Such an arrangement is particularly suitable for, for example, a rotatable configuration of the combination of heat sink and light-emitting diode arrangement. If, for example, the heat conducting medium is rotated about its longitudinal axis, the inflow profile of the heat conducting medium does not change significantly since the cooling fins are arranged in the circumferential direction or in the direction of rotation. In this way, a cornering headlamp or the inclination adjustment of a headlamp can be realized with a simultaneously advantageous air flow behavior.
• the heat-conducting means has a cuboid shape, the heat-conducting means having a cover plate extending from the cooling fins, the spaces between which form air guiding channels for conducting the outgoing air flow, the cover plate being suitable for receiving the light-emitting diode arrangement , wherein an optical deflection means is provided which is suitable for the light generated by the light-emitting diode arrangement in one direction redirect parallel to the outgoing air flow.
• a cuboidal heat sink is used, which is easy to process and is available in large quantities as a semi-finished product.
• a housing is provided for receiving the heat-conducting agent, which forms a pivoting receptacle for the heat-conducting agent, in which the heat-conducting agent is pivotably received, the housing at least in sections in the region of an opening which is used to flow against the heat-conducting agent with the incoming airflow is suitable.
• Rib surface is independent of the swivel angle of the heat transfer medium.
• the heat-conducting medium is enclosed by a heat-conducting medium housing, which has retaining webs which are suitable for receiving a lens or a shade in front of the light-emitting diode arrangement.
• a heat-conducting medium housing which has retaining webs which are suitable for receiving a lens or a shade in front of the light-emitting diode arrangement.
• the arrangement of retaining webs on the heat-conducting agent housing further contributes to a compact design of the headlight.
• the recess is equipped with a reflector and / or has a reflective surface. This achieves a good light yield in the direction of the preferred direction of radiation.
• a heat exchanger is provided which is suitable for optionally supplying or removing heat from the air flow. In this way, the temperature of the air flow can be influenced in a suitable manner, for example the air flow can be preheated for faster heating or additionally cooled at extremely high outside temperatures.
• Heat conducting means is suitable for directing the outgoing air flow in the direction of the preferred direction of emission 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 direction of emission of the emitted light. Accordingly, a combination of such
• Thermally conductive elements both an air supply and air removal from the light room can be achieved.
• Such a combination is conceivable, for example, in the case of a headlight which is equipped with a low beam and a fog lamp and / or separate high beam.
• Airflow in the manner according to the invention can be discharged, for example, via the heat-conducting agent of the fog lamp.
• a headlight condensation protection is known from EP 0 859 188 A2, in which an air flow comes into contact with the headlight pane and condensation on optical surfaces can be avoided.
• a separate heating element for example a heating wire, is to be provided which can preheat the air flow. It is also known to equip the light-emitting diode arrangement with a heat-conducting agent 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.
• the heat source as such cannot be regulated, because the main task of the lighting device is still to act as a light source. Problems arise in this case, in particular in the case of extremely high, but also extremely low, ambient temperatures, for example because the lamps cannot be cooled sufficiently or take far too long to provide sufficient heat to defrost the headlamp lens.
• this object is achieved by a headlight with the characterizing features of claim 13.
• a heat exchanger is provided which is suitable for selectively supplying or withdrawing heat from the air flow, the air flow being able to come into contact with the headlamp lens, has a suitable regulating influence on the temperature of the air flow.
• the air flow can be preheated for faster heating or additionally cooled at extremely high outside temperatures.
• the Means for generating an air flow is a motor-driven fan. This measure enables a constant and controllable air flow to be provided.
• the air flow circulates between the headlamp lens, the heat exchanger and the heat-conducting agent. Accordingly, the influence of ambient air can be largely excluded and the air flow can be heated up much faster, for example.
• the heat-conducting agent has cooling fins which are oriented approximately parallel to the air flow.
• the headlight to have a housing, an air-flow guide being provided within the housing, which is designed as a housing wall and is suitable for deflecting the air flow onto the heat-conducting agent.
• headlights which are equipped with a plurality of light-emitting diode arrangements have a high need for cooling.
• the headlamp must be a compact unit that has to be fitted into a limited installation space.
• the headlamp is equipped with at least one deflecting blade with at least a first section and a second section, the first section being suitable for directing part of the air flow onto the first heat sink and the second section being suitable for directing part of the air flow
• the individual heat sinks of the assigned light diode arrangements can be flowed on in a very targeted and thus effective manner, a comparatively small installation space being required since, for example, only one fan is required.
• the deflection vane is designed as part of the housing.
• the deflection vane provides an integral
• Part of the housing which can be used, for example, to optimize the manufacturing and assembly process.
• the deflection vane has an approximately V-shaped cross section.
• 1 shows a headlight according to the invention in a side sectional view
• 2 shows a heat-conducting means of a headlight according to the invention in a perspective sectional view
• FIG. 3 shows an alternative embodiment of a heat-conducting agent in a partially sectioned perspective view
• FIG. 4 shows an alternative embodiment of a heat-conducting agent in a partially sectioned perspective view
• FIG. 5 shows a headlight according to the invention
• FIG. 6 shows a headlight according to the invention
• FIG. 7 is a perspective view of a headlamp according to FIG. 6.
• a headlight 1 essentially comprises a cylindrical heat-conducting housing 8, in which a heat sink 3 with a light-emitting diode arrangement 2 is accommodated.
• the heat-conducting agent housing 8 is provided on one side with retaining webs 16, which serve as receptacles for a lens 17 or a shader, the light from the light-emitting diode arrangement 2 being projected onto a headlight lens 6 via the lens 17.
• the heat-conducting medium 3 itself has a cylindrical shape with a solid core 13, cooling fins 10 extending from the solid core 13 in the radial direction along a longitudinal axis 11 of the heat-conducting medium 3 and, in this embodiment, forming a number of air-guiding channels 12 together with the heat-conducting medium housing 8 , which essentially in the direction of the lens 17 and the
• Headlight lens 6 are aligned. However, the air guide channels 12 are also formed when no heat-conducting medium housing 8 is provided.
• the heat conducting means 3 is designed to be rotationally symmetrical about its longitudinal axis 11. To accommodate the LED arrangement 2, the heat-conducting means 3 has a conical recess 14 within the solid core 13, the conical recess 14 being able to continue in the area of the cooling fins 10.
• the optical axis of the light-emitting diode arrangement 2 advantageously coincides with the longitudinal axis 6 of the heat conducting means 3.
• the LED arrangement 2 now emits heat to the heat-conducting medium 3.
• the cooling air source shown for example a blower, reaches the cooling body 3 an incoming cooling air flow 4, which flows through the air channels 12 and leaves the air channels 12 as a heated outgoing air flow 5, the outgoing air flow 5 essentially onto the lens 17 or onto the headlight lens 6 is aligned.
• This heated outgoing air flow 5 heats up the lens 17 and the headlight lens 6 in a suitable manner and thus keeps them free of ice and fog.
• heat-conducting agent 3, heat-conducting agent housing 8, including lens 17 and light-emitting diode arrangement 2 is designed to be pivotable relative to a support frame 9.
• the support frame 9 can be part of the headlight 1 and has an opening 15 through which the incoming air flow 4 can be fed to the heat sink 3.
• a linkage 7 is provided for pivoting the heat-conducting means 3, whereby, for example, a headlight range control and / or a curve headlight can be implemented.
• FIG. 2 Another embodiment of a heat conducting means 20 is shown in FIG. 2.
• the heat-conducting means 20 used here essentially has a semi-cylindrical shape, the heat-conducting means 20 likewise comprising a solid core 24, around which the cooling fins 23 are arranged radially.
• cooling fins 23 are aligned in the circumferential direction and not in the longitudinal direction.
• the cooling fins 23 form air channels 25, which can be flowed against by an incoming air flow 4, and leave the heat-conducting agent 20 in an outgoing air flow 5, which is essentially aligned with the headlight lens 6.
• a recess 22 is provided for receiving the light-emitting diode arrangement 2, its optical axis is also aligned in the direction of the headlamp lens 6.
• the heat-conducting agent 30 used here is essentially comparable to the heat-conducting agent 3 shown in FIG. 1 and comprises a solid core 31, which is radially equipped with cooling fins 32 which run in the longitudinal direction of the heat-conducting agent 30 and form air guiding channels 33.
• the solid core 31 has a conical shape, the incoming air stream flowing towards the core 31 from the tip side, being passed through the air guide channels 25 between the cooling fins 32 and the heat conducting means 30 as the outgoing air stream 5 in Leaves direction of the headlight lens 6.
• a recess 34 is provided in the center of the heat-conducting means 30 and serves as a receptacle for the light-emitting diode arrangement 2.
• FIG. 4 Another alternative embodiment of a heat conducting means 40 is shown in FIG. 4.
• the heat conducting means 40 has an essentially cuboid shape and is provided with a cover plate 43. Cooling fins 41 extend from the cover plate 43, the spaces between the cooling fins 41 forming air guiding channels 42. Furthermore, it is provided to arrange the light-emitting diode arrangement 2 on the top side of the cover plate 43 and to use a mirror 44 or a prism so that the light from the light-emitting diode arrangement 2 can be deflected in the direction of the outgoing air stream 5, so that both the light from the light-emitting diode arrangement 2 and the heated one too
• Airflow 5 can be aligned with the headlamp lens 6.
• the heat conducting means 20, 30, 40 according to FIGS. 2 to 4 are also designed to be pivotable. It is it is further provided that the respective heat conducting means 20, 30, 40 is at least partially enclosed by the housing 9, the housing 9 each having an opening 15 through which the incoming air flow 4 can flow into the air guiding channels 12.
• the cooling fin surface can flow largely independently of the respective swivel angle of the heat conducting means 3, 20, 30, 40.
• Such an advantageous inflow is supported, for example, by a heat-conducting means 20 according to FIG. 2, in which the orientation of the cooling fins 23 with respect to the incoming air flow 4 does not change despite pivoting of the heat-conducting means 20 about the longitudinal axis.
• a streamlined configuration of the heat conducting means 30 can also be provided in order to ensure an air flow that is as free of pressure loss as possible.
• All embodiments of the heat conducting means 3, 20, 30, 40 ultimately have in common that the outgoing air flow 5 can be directed in a direction parallel to the preferred direction of radiation 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 radiation direction. However, it is also conceivable that the outgoing air flow is directed against the direction of radiation 18, for example for discharging the air from the light space when using a separate fog lamp with a heat-conducting agent 3, 20, 30, 40 according to the invention in the same headlight 1 Provisions for the supply of the air flow are ensured that the same cooling fin surface is always flowed to despite the pivoting of the heat-conducting agent.
• cutouts 14, 22, 34 are equipped with a reflector and / or a reflecting surface, so that the light yield in the direction of the headlamp lens 6 can be improved.
• Alternative geometric shapes are of course also held the cylindrical or semi-cylindrical shape of the heat conducting means 3, 20, 30, 40 is conceivable as long as the purpose according to the invention can thereby be fulfilled.
• a headlight 50 according to the invention essentially comprises a headlight housing 60 with a translucent headlight lens 51, in which a lighting arrangement 61 is accommodated.
• the light-emitting arrangement 61 essentially comprises a light-emitting diode arrangement 54 with a fan housing 52.
• a lens 53 is attached in front of the light-emitting diode arrangement 54 and is held by a frame 55. To cool the
• a heat sink 56 is provided, which projects into the fan housing 52 and is blown with cooling air by a fan 58.
• the heat-conducting medium has cooling fins 62 which extend along the heat-conducting medium 56 in the flow direction. There can still be one
• Air flow guide 57 may be provided in the form of a housing wall, with which at least part of the air flow generated by fan 58 is fed to cooling body 56.
• Fan 58 is the preferred one shown here
• Embodiment arranged such that a circulating air flow 59 is generated within the housing 60, which can initially absorb the heat given off by the heat sink 56 in order to then be cooled on the headlight lens 51. This allows the
• Headlamp lens 51 can be kept free of ice and fog despite the lack of infrared light in the LED arrangement 54.
• a heat exchanger 63 can be provided for preheating or for cooling the circulating air flow 59, for example if the heat-conducting agent 56 has not yet reached its target temperature or the air temperature is too high to ensure suitable cooling of the heat-conducting agent.
• a circulating air flow 59 is shown. An air flow is also conceivable, which is led out of the headlight at any point as long as the heat exchanger 63 can act on the air flow in the manner described.
• FIGS. 6 and 7 Another embodiment of a headlight 70 according to the invention is shown in FIGS. 6 and 7.
• the headlight 70 comprises a housing 71, in which at least one deflection blade 75 and a fan 79 are provided. Furthermore, the headlight 70 is equipped with a first light-emitting diode arrangement 72 with an associated first heat sink 73 and a second light-emitting diode arrangement 77 with an associated second heat sink 78, both the heat sink arrangements 73, 78 and the air flow of the fan 79 being directed into the housing 71 are.
• a deflection blade 74 is provided, which is suitable for dividing the air flow of the fan 79 into two separate air flows, each of which can be supplied to the first heat sink 73 or the second heat sink 78 in a precise manner.
• the deflection vane 74 is divided into a first section 75 or a second section 76, the sections 75, 76 having suitable air guiding means in order to divide the air flow in the manner described above.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=34967263

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• 2004
  • 2004-05-25 DE DE102004025623A patent/DE102004025623A1/de not_active Withdrawn
• 2005
  • 2005-05-12 EP EP05740258A patent/EP1749170B1/fr not_active Expired - Fee Related
  • 2005-05-12 AT AT05740258T patent/ATE553334T1/de active
  • 2005-05-12 WO PCT/EP2005/052157 patent/WO2005116520A1/fr active Application Filing

Non-Patent Citations (1)

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