EP3822536A1 - Phares pourvu de dispositif de protection contre la condensation - Google Patents

Phares pourvu de dispositif de protection contre la condensation Download PDF

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Publication number
EP3822536A1
EP3822536A1 EP19209156.9A EP19209156A EP3822536A1 EP 3822536 A1 EP3822536 A1 EP 3822536A1 EP 19209156 A EP19209156 A EP 19209156A EP 3822536 A1 EP3822536 A1 EP 3822536A1
Authority
EP
European Patent Office
Prior art keywords
headlight
air
air duct
curvature
longitudinal axis
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.)
Withdrawn
Application number
EP19209156.9A
Other languages
German (de)
English (en)
Inventor
Sebastian GODDERIDGE
Stephan Zauner
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.)
ZKW Group GmbH
Original Assignee
ZKW Group GmbH
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 ZKW Group GmbH filed Critical ZKW Group GmbH
Priority to EP19209156.9A priority Critical patent/EP3822536A1/fr
Priority to PCT/EP2020/081760 priority patent/WO2021094370A1/fr
Priority to US17/770,443 priority patent/US11965636B2/en
Priority to CN202080078952.9A priority patent/CN114641653B/zh
Priority to EP20801311.0A priority patent/EP4058723A1/fr
Publication of EP3822536A1 publication Critical patent/EP3822536A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/60—Heating of lighting devices, e.g. for demisting
    • 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
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/13—Ultraviolet light; Infrared light
    • 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
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/20—Promoting gas flow in lighting devices, e.g. directing flow toward the cover glass for demisting

Definitions

  • the invention relates to a headlight, in particular a motor vehicle headlight, comprising a headlight housing with a light exit opening closed by a cover plate, at least one LED light source which is arranged in at least one light module positioned in the headlight housing for generating a predetermined light distribution in front of the headlight, and a Dew protection device arranged in the headlamp housing with at least one air duct for guiding air and with at least one radiation emitter, the at least one air duct having an air inlet opening and at least one air outlet opening and the air outlet opening preferably facing the cover panel, as well as the air guided in the air duct with that from the radiation emitter generated thermal radiation can be heated.
  • condensation water water that is condensed on a cool surface of objects as soon as air or gas containing water vapor is cooled below the dew point
  • condensation water condensation water
  • condensation or fogging Condensation on technical objects such as cover panes or in the interior of vehicle headlights.
  • the document concerns EP 0 859 188 A2 a headlight condensation protection in which the waste heat of a conventional quartz bulb base of a low beam and / or a high beam lamp, which typically heats up to 900 ° C when the lamp is in operation, is conducted by means of a reflector in the direction of the cover plate of the headlight housing in the interior of the headlight housing and this heats up and thus ensures a condensate-free cover plate or condensate-free surfaces in the headlight housing.
  • this conventional variant of the trace heating is the Headlight housing due to the insufficient waste heat of the energy-saving light sources, such as light-emitting diodes, is no longer sufficient.
  • the document DE 10 2011 084114 A1 relates to a conventional motor vehicle headlight with a headlight housing and a light exit opening closed by a cover plate.
  • a light module for generating a predetermined light distribution in front of the vehicle.
  • a fan device including a heating element with a subsequent tubular air duct is arranged in the housing, the heating element being integrated within the fan device.
  • the heating element can be designed, for example, as a heating sleeve that encases the air duct from the outside, as a heating conductor, heating coil, heating band, heating mat or heating register.
  • the fan device is used to circulate heated air inside the headlight housing and thus to ensure condensation-free surfaces in the headlight housing.
  • the disadvantage of this embodiment is at least that the fan device, for example in the form of an axial fan with integrated heating elements, is structurally complex and also entails increased operating and maintenance costs during operation.
  • a headlight for a motor vehicle has become known in which a light-emitting diode arrangement is used as the main light source. Since modern white light-emitting diodes - in contrast to conventional headlights with previously common halogen light sources - generate practically no infrared heat in the light cone, which could be used to defrost or defrost the headlight cover, this headlight has its own heat conducting agent as a headlight protection against condensation. The heat transfer agent is used to exchange heat that is generated on the back of the luminous surfaces of the light-emitting diode arrangement and an air flow inside the headlamp.
  • the heat conduction means is equipped with air conduction means and is preferably designed as a cooling body with cooling fins, the spaces between the cooling fins forming air conduction channels.
  • the cooling fins are designed parallel to the air flow, which conducts the waste heat from the light-emitting diodes to the cover plate of the headlamp. Since the heat source of the light-emitting diodes cannot be regulated, it is proposed to additionally provide a heat exchanger so that heat can optionally be supplied to the air flow with the heat exchanger or, conversely, heat can be withdrawn from the air flow.
  • the disadvantage of this embodiment is at least that the waste heat from the light-emitting diodes is usually too low to ensure adequate heating of the cover plate of the headlight in extreme weather conditions with snowfall or fog or at particularly low temperatures. Furthermore, the intended heat transfer agent and a additionally required heat exchanger for temperature control of the air flow complex and expensive in terms of apparatus.
  • Modern LED headlights are designed in such a way that the light-emitting diodes generate as little waste heat as possible.
  • an air flow in direct contact with a heat sink which is usually located on the back of the luminous surfaces of the light emitting diodes, can usually reach temperatures of a maximum of 80 ° to 100 ° C, although the air flow makes its way to the cover pane has already cooled down significantly.
  • the previously known concepts for rapid de-icing and defrosting of cover panes or for avoiding undesirable condensation in vehicles are therefore unsuitable if they are LED vehicle headlights.
  • the device that has become known for defrosting a lighting unit is expensive, since a plurality of light-emitting diodes are arranged there with their rear sides on an air duct which is arranged in the interior of a vehicle headlight.
  • the air duct extends from a rear side of a reflector through this in the direction of the cover plate of the headlight. Waste heat from the engine compartment of the motor vehicle, which reaches the interior of the vehicle headlight inside the air duct from a fan located in the engine compartment, is further heated by the waste heat produced on the back of the light-emitting diodes attached to the outside of the air duct.
  • the air duct has a nozzle at its front free end, which is oriented towards the cover plate.
  • the disadvantage of this design is the high structural effort, namely to arrange the air duct in such a way that this air duct protrudes through the reflector and forms a connection between the interior of the vehicle headlight and the engine compartment without disturbing the desired light distribution of the reflector.
  • Another disadvantage is that this defrosting device only starts to work for the headlight when the operating temperature of the internal combustion engine in the engine compartment reaches correspondingly high values, for example of over 100 ° C. Rapid defrosting and defrosting of the cover panes of the vehicle headlight is not possible even with this complex device.
  • the object of the present invention is therefore to provide a headlight with a condensation protection device for accompanying heating of the headlight, which avoids the disadvantages of the prior art described.
  • the anti-condensation device is intended to ensure the shortest possible defrosting time for the cover panes of the headlamp equipped with it.
  • the condensation protection device should be constructed in a simple manner inside the Be integrated into the vehicle headlights, and be inexpensive and as maintenance-free as possible when the heating system is running.
  • the invention also provides a motor vehicle with at least one headlight with a condensation device.
  • a headlight in particular a motor vehicle headlight, which has a headlight housing with a light exit opening closed by a cover plate, at least one LED light source, which is arranged in at least one light module positioned in the headlight housing for generating a predetermined light distribution in front of the headlight
  • an im Headlight housing arranged dew protection device with at least one air duct for guiding air and at least one radiation emitter, wherein the at least one air duct has an air inlet opening and at least one air outlet opening and the at least one air outlet opening preferably faces the cover panel, as well as the air guided in the air duct with the from Radiation emitter generated heat radiation can be heated, the at least one radiation emitter is arranged within the air duct in the area of the air inlet opening, the air duct consisting of an I. Infrared radiation reflecting and opaque wall material is made and the air duct between the air inlet opening and the at least one air outlet opening has at least one curved longitudinal axis section with a radius of
  • the air duct of the anti-condensation device is expediently designed in such a way that when thermal radiation is fed in in the form of infrared radiation through the radiation emitter arranged within the air duct, the escape of visible light at the at least one air outlet opening is avoided.
  • This is ensured by at least one curved longitudinal axis section between the air inlet opening on which the radiation emitter is arranged and the air outlet opening.
  • the at least one air duct can have one or more curved sections.
  • the air duct is shaped in such a way that visible heat radiation components of the radiation emitter are correspondingly reflected or totally reflected on the inner surfaces of the curved longitudinal axis sections of the air duct.
  • the air duct is made of a wall material that reflects infrared radiation and is impermeable to light.
  • curvature or a curved longitudinal axis section in the context of the present application:
  • the curvature of a flat curve is the change in direction when going through the curve.
  • the curvature of a straight line is zero everywhere because its direction does not change.
  • a circle (arc) with the radius r has the same curvature everywhere, because its direction changes equally strongly everywhere. The smaller the radius of the circle, the greater its curvature.
  • the central angle or the angle of curvature is equal to the outer angle between the circular tangents in the end points of the arc-shaped curve piece.
  • a kink is a point at which a curve changes its curvature and, as a result, its direction.
  • the corner points of a rectangle are, for example, such kink points.
  • An air duct of a condensation protection device according to the invention can thus be understood to mean one or more kink points.
  • an air duct that consists of two or more straight air duct sections, the longitudinal axes of which in the form of an open polygonal line has one or more inflection points is also encompassed by the invention.
  • the cross-section of the air duct is not subject to any design limits.
  • the air duct can have a square, rectangular, triangular, circular or elliptical cross-section, for example, in sections or also continuously.
  • the air duct can therefore - depending on the requirements and space requirements of the headlight - at least in sections be angular in the shape of a shaft or else round in the shape of a tube.
  • the air duct can fork in a Y-shape, for example, and have two or more air outlet openings, from each of which heated air radiates in order to heat the cover pane.
  • several air inlet openings can open into a common air outlet opening of the air duct.
  • the at least one air outlet opening is preferably facing the cover plate of the headlight or at least oriented in such a way that the air outlet opening from the at least one air outlet opening outflowing heated air is guided as directly as possible in the direction of the cover plate.
  • a light module has at least one light source for emitting the light to generate the light distribution, which is designed here as a light-emitting diode (LED).
  • the light module has, for example, primary optics, for example in the form of a reflector and / or TIR (Total Internal Reflection) attachment optics, for bundling the light emitted by the semiconductor light source.
  • the light module can also have secondary optics, for example in the form of a converging lens, in the beam path of the emitted light, the secondary optics projecting the bundled light to generate the light distribution onto the roadway in front of the vehicle.
  • a diaphragm arrangement can be provided in the light module between the primary optics and the secondary optics, the top edge of which (in the case of a vertical diaphragm arrangement) or its front edge (in the case of a horizontal diaphragm arrangement) as The cut-off line is projected onto the road in front of the vehicle.
  • the air duct in a headlight, can have a first curved longitudinal axis section between the air inlet opening and the air outlet opening and at least one further, second curved longitudinal axis section spaced therefrom in the longitudinal axis direction of the air duct.
  • the heated air can be brought as close as possible to the sections of the headlight housing to be heated by means of an elongated design of the air duct. It is also possible within the scope of the invention to make the air duct comparable to a heat exchanger in such a way that heated air can collect within the air duct and the heated air within the air duct has a higher temperature than when the air emerges from the at least air outlet opening of the air duct. In this way, the air duct itself can act as a heat store, comparable to a radiator, and heat the ambient air inside the headlight housing.
  • the radii of curvature and the angles of curvature of the first curved longitudinal axis section and of the headlight can be used at least the second curved longitudinal axis section be the same in each case.
  • standardized air duct sections can advantageously be joined to one another in order to be able to bring the air duct as space-saving as possible and as close as possible to the sections of the headlight housing to be heated.
  • the radii of curvature and / or the angles of curvature of the first curved longitudinal axis section and of the at least second curved longitudinal axis section can be different.
  • This embodiment offers the advantage of being able to install an air duct that is as space-saving as possible within the headlight housing with individually designed air duct sections that are joined to one another.
  • the angle of curvature of the at least one curved longitudinal axis section of the air duct is between 50 ° and 130 °, preferably between 60 ° and 120 °, particularly preferably between 70 ° and 110 °.
  • the cited angles of curvature are to be understood to mean that these angles of curvature are measured relative to a longitudinal axis direction of a straight section of the air duct.
  • a straight length section of the air duct can point upwards in the vertical axis direction, the air inlet opening together with the radiation emitter being located at the lower end of this vertically oriented air duct.
  • a first curved longitudinal axis section can be curved, for example, between 50 ° and 130 ° in relation to the perpendicular axis direction. If the angle of curvature is selected to be greater than 90 ° in this case and is, for example, 120 ° in relation to the vertical axis direction, the free end of the air duct with its air outlet opening points downwards at an angle.
  • a highest section is formed in which the heated air will collect before it moves downwards due to the convection flow - or in the case of the use of an additional fan blower due to the set forced flow Air outlet opening flows.
  • This fact can advantageously be used, for example, in such a section of the air duct which is highest in relation to the respective installation position, to form an air collecting space which is connected to the air duct and in which the heated air can collect.
  • This conceivable embodiment variant can, as already mentioned at the beginning - in a manner comparable to a heat exchanger - serve to ensure that heated air can collect within the air duct and the heated air within the air duct can Has a higher temperature than when the air emerges from the at least air outlet opening of the air duct.
  • the radius of curvature of the at least one curved longitudinal axis section of the air duct can be from 0 mm to 100 mm, preferably from 1 mm to 80 mm.
  • longitudinal axis sections of the air duct can thus also be used which have a kink, that is to say a curvature with a radius of curvature of 0 mm.
  • the air duct can expediently be made from a wall material which is selected from the group consisting of: sheet steel, aluminum, aluminum alloys, metal matrix composite material, plastic, temperature-resistant plastic and / or a plastic composite material.
  • thermoresistant plastics which are suitable as wall materials, may be mentioned as examples: PI polyimide, PEEK polyetheretherketone, PPS polyphenylene sulfide, PA polyamide, PBT polybutylene terephthalate, PET polyethylene terephthalate.
  • the embodiment variant of a headlight according to the invention in which the radiation emitter is an infrared radiator, preferably a quartz radiator, a halogen radiator or an infrared lamp, can be particularly advantageous.
  • Infrared lamps also called red light lamps or heat lamps
  • a mostly red filter can be built into the infrared lamp in order to filter out the remaining (non-red) visible light.
  • the illuminants used can also contain these filters directly in their glass envelope.
  • the emitted radiation mainly only includes so-called near infrared radiation (NIR).
  • a particularly economical and inexpensive variant of the invention is provided with a headlight in which the radiation emitter is a halogen lamp.
  • standardized halogen lamps H11 or comparable lamps can be used as radiation emitters. This has the advantage that these are common spare parts that can be procured quickly and inexpensively. Depending on the design of the headlight, it is thus possible that a radiation emitter in the form of a halogen lamp can be exchanged easily and quickly by anyone.
  • the air duct can expediently be equipped on its inner surfaces with a visible light-absorbing, light-shading coating, the light-shading coating preferably being dark, particularly preferably deep black.
  • Appropriate light-shading coating materials can be obtained, for example, from ACM Coatings GmbH, a subsidiary of Acktar Ltd. Acktar (see https://www.acm-coatings.de/).
  • Such light-absorbing coatings can be used, for example, in the form of direct coatings.
  • Coatings in the form of foils or films can also be used. These are deep black coated foils and films with or without an adhesive layer, which can also be used to coat larger surface sections.
  • excellent absorption values can be achieved with such light-absorbing films.
  • such films can have a hemispherical reflection of less than 1% at wavelengths of 10 nm - 10,000 nm.
  • the condensation protection device in the case of a headlight, can furthermore comprise a fan fan, which fan fan is connected to the air duct.
  • a fan blower offers the advantage that the heated air flowing out of the air duct can, as a result of the forced flow caused by the fan blower, be directed particularly effectively to corresponding sections of the cover plate for defrosting. This is particularly advantageous in the case of larger headlight housings, for example of trucks, in order to quickly and effectively heat the correspondingly larger volumes within the headlight housing.
  • the fan blower can be integrated in the air duct in a headlight.
  • the fan blower can be arranged entirely or at least partially within the air duct.
  • the fan blower is preferably arranged in the vicinity of the radiation emitter in order to transport the heated air away from the radiation emitter as quickly as possible within the air duct.
  • the air outlet opening of the air duct is designed as a diffuser for uniform air distribution.
  • the exit speed of the air from the air outlet opening is evened out or slowed down by using a diffuser.
  • the air space within the headlight housing is heated as evenly as possible.
  • a motor vehicle with at least one headlight according to the invention is also specified.
  • Fig. 1 shows a first headlight 1 according to the invention with a condensation protection device 30.
  • This is a headlight 1 for a motor vehicle.
  • the headlamp 1 has a headlamp housing 10 including a cover plate 11 which, in a known manner, closes a light exit opening 12 which, when the headlamp 1 is installed in the motor vehicle, points forward in the direction of travel in the direction of a roadway.
  • a light module 20 with several LED light sources 21 is located inside the headlight housing 10.
  • the headlight 1 is equipped with a condensation protection device 30 which has an air duct 40 for guiding air 41. The air flow direction within the air duct 40 is here through a Arrow 41 symbolizes.
  • the air duct 40 shown here is essentially vertically or slightly inclined upwards, fastened inside the headlight housing 10 and has an air inlet opening 42 at its lower end in the installed position and an air outlet opening 43 at its upper, curved end.
  • the direction of the longitudinal axis of the straight length section of the air duct 40 is denoted by the reference symbol 44 to identify the longitudinal axis of the air duct 10.
  • the air duct 10 is made here from a wall material 45, for example from a temperature-resistant plastic made of polybutylene terephthalate (PBT for short).
  • An inner surface 46 of the air duct 40 is provided here with a light-shading coating 70 which largely absorbs visible light and prevents undesired light reflection.
  • a curved longitudinal axis section 50 adjoins the straight longitudinal axis section 44 of the air duct 10.
  • the air outlet opening 43 is thus oriented essentially horizontally in the direction of the upper edge of the cover plate 11.
  • An angle of curvature 52 between the straight longitudinal axis section 44 of the air duct 10 and the curved longitudinal axis section 50 is slightly greater than 90 ° here.
  • a radiation emitter 60 which is designed here as an inexpensive halogen lamp 65, is arranged at the lower end of the air duct 40 in the area of the air inlet opening 42.
  • the heated air rises in the direction of arrow 41 within the air duct 40 from the bottom to the top and leaves the air duct 40 after the curved longitudinal axis section 50 through the air outlet opening 43.
  • FIG Fig. 1 A convection flow is sketched in dashed lines, after which the heated air in the interior of the headlight housing 10 flows along the inside of the cover plate 11, is cooled there and then passes through the air inlet opening 42 into the air duct 40 at the lower edge of the headlight housing 10. In the air duct 40, the air is again heated by the radiation emitter 60 and rises again upwards in the direction of the arrow 43.
  • FIG. 2 shows in schematic sketches possible variants of air ducts 40 with a curved ( Fig. 2a ) or a kinked ( Figure 2b ) Longitudinal section.
  • the air ducts 40 shown here purely schematically are possible alternatives for installation, for example, in the in Fig. 1 to understand headlights 1 shown.
  • the curved longitudinal axis section 50 which adjoins the upper end of the straight longitudinal axis section 44 of the air duct 40, has a radius of curvature 51 and an angle of curvature 52.
  • the radius of curvature 51 is here - given an assumed overall length of the air duct 40 of approximately 100 mm - for example 10 mm.
  • the angle of curvature 52 of the curved longitudinal axis section 50 in relation to the axis direction 44 of the straight longitudinal axis section of the air duct 40 is here for example 120 °.
  • the air outlet opening 43 thus points obliquely downwards in the installation position of the air duct 40.
  • a halogen lamp 65 is used here as the radiation emitter 60.
  • the air duct 40 has a kink, that is to say a curved longitudinal axis section 55 with a radius of curvature 56 equal to zero or 0 mm.
  • This kink is located between the lower straight longitudinal axis section 44 and the longitudinal axis section 44 of the air duct 40 adjoining this at an angle of curvature 57 or here at a kink angle 57.
  • the selected angle of curvature 57 or here the kink angle 57 is, for example, 110 °.
  • the lower straight longitudinal axis section 44 is oriented slightly obliquely upwards here.
  • the upper or second straight longitudinal axis section 44 is oriented essentially horizontally here. In the installation position of the air duct 40, the air outlet opening 43 thus points approximately horizontally into a headlight housing (not shown).
  • An infrared radiator 61 serves as the radiation emitter 60 here.
  • Fig. 3 shows a further embodiment according to the invention of a headlamp 1 according to the invention with a condensation protection device 30 and a double-bent air duct 40 in the installation position within a headlamp housing 10.
  • the first curved longitudinal axis section 50 forms an inflection point with a radius of curvature 51 with a radius of 0 mm and with an angle of curvature 52 of approximately 110 °.
  • the second curved longitudinal axis section 55 of the air duct 40 forms a kink point with a radius of curvature 56 with a radius of 0 mm and with an angle of curvature 57 of approximately 90 °.
  • the heated air flows out of the air outlet opening 43 in the direction of arrow 41 here obliquely upwards.
  • Fig. 4 shows a further inventive embodiment of a headlamp 1 according to the invention with a condensation protection device 30 and a double-curved air duct 40 in the installation position within a headlamp housing 10.
  • the first curved longitudinal axis section 50 has a radius of curvature 51 of 10 mm and an angle of curvature 52 of approximately 110 °.
  • the second curved longitudinal axis section 55 of the air duct 40 has a radius of curvature 56 of 15 mm and an angle of curvature 57 of approximately 90 °.
  • the heated air flows out of the air outlet opening 43 in the direction of arrow 41 obliquely upwards.
  • a fan blower 80 is additionally provided to improve the convection.
  • FIG. 5 shows a further embodiment of a headlight 1 according to the invention with a bifurcated, double-curved air duct 40 of a condensation protection device 30 in the installation position within the headlight housing 10.
  • the air duct 40 has at its opposite ends two spaced air outlet openings 43, which are located at the upper and lower edge of the Headlamp housing 10 preheated air 41 in blow in the interior of the headlight housing 10.
  • a radiation emitter 60 is located here approximately in the middle within the air duct 40.
  • FIG. 6 shows in schematic sketches possible variants of air ducts 40 with a curved ( Figure 6a ) or a kinked ( Figure 6b ) Longitudinal section.
  • the air channels 40 shown here each have an air outlet opening 43 which is shaped in the form of a diffuser 75. The exit speed of the preheated air is reduced and evened out by the diffuser 75 in a manner known per se.
  • air ducts 40 are used, particularly gentle and uniform heating of the interior of the headlight housing 10 is achieved.

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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)
EP19209156.9A 2019-11-14 2019-11-14 Phares pourvu de dispositif de protection contre la condensation Withdrawn EP3822536A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP19209156.9A EP3822536A1 (fr) 2019-11-14 2019-11-14 Phares pourvu de dispositif de protection contre la condensation
PCT/EP2020/081760 WO2021094370A1 (fr) 2019-11-14 2020-11-11 Phare doté d'un dispositif de protection anti-condensation
US17/770,443 US11965636B2 (en) 2019-11-14 2020-11-11 Headlight with anti-condensation protection device
CN202080078952.9A CN114641653B (zh) 2019-11-14 2020-11-11 具有防结露装置的前照灯
EP20801311.0A EP4058723A1 (fr) 2019-11-14 2020-11-11 Phare doté d'un dispositif de protection anti-condensation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19209156.9A EP3822536A1 (fr) 2019-11-14 2019-11-14 Phares pourvu de dispositif de protection contre la condensation

Publications (1)

Publication Number Publication Date
EP3822536A1 true EP3822536A1 (fr) 2021-05-19

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EP19209156.9A Withdrawn EP3822536A1 (fr) 2019-11-14 2019-11-14 Phares pourvu de dispositif de protection contre la condensation
EP20801311.0A Pending EP4058723A1 (fr) 2019-11-14 2020-11-11 Phare doté d'un dispositif de protection anti-condensation

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP20801311.0A Pending EP4058723A1 (fr) 2019-11-14 2020-11-11 Phare doté d'un dispositif de protection anti-condensation

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US (1) US11965636B2 (fr)
EP (2) EP3822536A1 (fr)
WO (1) WO2021094370A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022123952A1 (de) 2022-09-19 2024-03-21 HELLA GmbH & Co. KGaA Beleuchtungsvorrichtung für Fahrzeuge sowie Ansteuerverfahren

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859188A2 (fr) 1997-02-12 1998-08-19 Volkswagen Aktiengesellschaft Dispositif pour éviter la formation de la rosée pour projecteur
DE102004025623A1 (de) 2004-05-25 2005-12-15 Hella Kgaa Hueck & Co. Scheinwerfer für ein Kraftfahrzeug
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WO2024061669A1 (fr) 2022-09-19 2024-03-28 HELLA GmbH & Co. KGaA Dispositif d'éclairage pour véhicules et procédé de commande

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US11965636B2 (en) 2024-04-23
EP4058723A1 (fr) 2022-09-21
WO2021094370A1 (fr) 2021-05-20
CN114641653A (zh) 2022-06-17

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