EP4055321A1 - Beleuchtungsvorrichtung für fahrzeuge - Google Patents
Beleuchtungsvorrichtung für fahrzeugeInfo
- Publication number
- EP4055321A1 EP4055321A1 EP20807673.7A EP20807673A EP4055321A1 EP 4055321 A1 EP4055321 A1 EP 4055321A1 EP 20807673 A EP20807673 A EP 20807673A EP 4055321 A1 EP4055321 A1 EP 4055321A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- temperature
- lighting device
- cover plate
- housing
- 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.)
- Granted
Links
- 238000005286 illumination Methods 0.000 title abstract 2
- 230000001419 dependent effect Effects 0.000 claims abstract description 9
- 230000031700 light absorption Effects 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 230000002745 absorbent Effects 0.000 claims description 24
- 239000002250 absorbent Substances 0.000 claims description 24
- 230000004907 flux Effects 0.000 claims description 24
- 238000010257 thawing Methods 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 239000006096 absorbing agent Substances 0.000 claims description 7
- 230000003595 spectral effect Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 abstract 1
- 230000004913 activation Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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
- F21S41/14—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]
-
- 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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/28—Cover glass
-
- 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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
Definitions
- the invention relates to a lighting device for vehicles with a hous se in which a light source and an optical unit for generating a predetermined light distribution are arranged, with a cover lens that closes an opening of the housing and through the light from an interior of the housing in egg ne environment passes through, with means for defrosting and / or defrosting the end disk.
- a lighting device for vehicles which has a housing in which a light source and an optical unit for generating a predetermined light distribution are arranged. An opening arranged at the front with light emission from the lighting device is closed by a transparent cover plate. An infrared radiation source, which is arranged on a rear side of a reflector of the optical unit, is provided as a means for defrosting and / or defrosting the cover lens.
- the disadvantage of the known lighting device is that a further consumer and control electronics are required for this.
- the object of the present invention is therefore to develop a lighting device for vehicles in such a way that means for defrosting and / or defrosting are provided in a space-saving and cost-effective manner.
- the invention in conjunction with the preamble of claim 1 is characterized in that the cover plate has a temperature-dependent light absorbent, by means of which light is converted into heat depending on the temperature.
- a temperature-dependent light absorbent is integrated in a cover plate, so that at low temperatures the light energy introduced by the optics unit into the cover plate is converted into Thermal energy.
- This thermal energy causes the lens to be de-iced or defrosted at low temperatures.
- the installation space can be significantly reduced in this way, since the light absorbent is arranged directly on the cover plate and / or within the cover plate. It is advantageous that no control of the light absorbent is required.
- the light absorbent is transparent so that the appearance of the lighting device is not changed.
- the basic idea of the invention is to influence the light radiation striking the cover lens during operation of the lighting device in such a way that a small part of the light energy is converted into thermal energy for defrosting or defrosting the cover lens and a large amount of light energy is allowed through for light emission.
- the invention advantageously enables an automatic conversion of part of the light energy provided by the light source into thermal energy for defrosting or defrosting the cover lens.
- the light absorbent is designed in such a way that when a limit temperature is exceeded, the degree of absorption of the light absorbent is zero or close to zero. This ensures that the full luminous flux is available for generating the light distribution above a certain temperature. Below the limit temperature or a limit temperature range, a reduced luminous flux emerges from the cover lens in the light emission direction, which, however, is selected to be so large that the minimum requirements with regard to the illuminance are guaranteed. At a temperature below the limit temperature, not a maximum luminous flux, but rather a luminous flux that is reduced to the same is emitted.
- the light absorber is designed such that when the temperature of the cover lens is below the limit temperature, the degree of absorption is in the range of 20% to 80%, preferably 30% to 70%, of the maximum luminous flux. This means that 20% to 80% or
- the maximum luminous flux is converted into thermal energy. After defrosting or defrosting the cover lens and with it If the temperature of the cover lens increases, the degree of absorption automatically decreases to zero, namely when the limit temperature is exceeded, so that the maximum luminous flux can be emitted.
- the limit temperature is in the range between 0 ° C to 6 ° C.
- the limit temperature is preferably 4 ° C. This ensures that the cover lens is reliably de-iced.
- a light source with such a light intensity is selected that a minimum luminous flux exits through the cover lens at a temperature of the cover lens below the limit temperature or in an operating temperature range of the vehicle.
- the cover plate has at least partially a thermochromic layer and / or a thermochromic admixture.
- the thermochromic layer can be applied as a film which preferably rests on an inside of the cover plate.
- the thermochromic layer or the thermochromic admixture can contain leuco dyes, with the cover lens becoming darker at low temperatures being accepted.
- the invention in connection with the preamble of patent claim 11 is characterized in that the cover lens has a temperature-dependent wavelength shifting means, by means of which the spectral components of the light are partially or completely shifted into an infrared wavelength range depending on the temperature.
- the cover lens can have a temperature-dependent wavelength shift means, by means of which spectral parts of the light passing through the cover lens are converted into an infrared wavelength. area is moved. The resulting heat is used to defrost or defrost the cover lens.
- FIG. 1 shows a schematic representation of a lighting device at a temperature of a cover lens above a limit temperature
- FIG. 2 shows a schematic representation of the lighting device at a temperature of the cover lens below the limit temperature
- a lighting device for vehicles is preferably formed as a headlight which is arranged in a front area of the vehicle.
- the lighting device has a housing 1, within which a light source 2 and an optical unit 3 are arranged.
- the light source 2 consists of a plurality of LED light sources 4 which are arranged on a printed circuit board 5.
- the optics unit 3 has a primary optics 6 and a secondary optics 7 arranged in the main emission direction H in front of the primary optics 6, by means of which the luminous flux 8 captured by the light source 2 is passed on in the direction of a cover plate 9 covering a front opening of the housing 1.
- the secondary optics 7 is designed as a lens which depicts the light entering on the side facing the Lichtquel le 2 according to a predetermined light distribution, for example low beam distribution.
- the cover plate 9 is provided with a temperature-dependent light absorber 10, so that, depending on the temperature, the luminous flux 8 striking the cover plate 9 is partially converted into thermal energy.
- the thermal energy heats the cover lens 9 so that the cover lens 9 defrosts or defrosts whoever can.
- the light absorber 10 thus serves as a means for defrosting and / or defrosting the cover plate 9.
- the light absorbent is designed as a thermochromic layer 10 which is applied to an inner side (flat side) of the closing disk 9.
- the inside of the cover plate 9 is arranged on a flat side of the cover plate 9 facing the optics unit 3.
- thermochromic layer is preferably designed as a film which is applied to a base material 11 of the cover plate 9.
- the base material 11 can consist of a transparent plastic material that is conventionally used for cover plates 9.
- thermochromic layer 10 has leuco dyes which lead to a darkening of the cover plate 9 below a limit temperature T G.
- the darkening of the cover lens 9 causes a partial conversion of the light energy provided by the light source 2 into thermal energy, so that the cover lens 9 is warmed up.
- the base material 11 of the cover plate 9 can also be provided with the light absorption means 10 only partially on the inside facing the optics unit 3.
- the light absorbent 10 can be segmented on the inside of the cover plate 9, wherein the light absorbent segments are preferably evenly distributed over the surface of the base material 11. This ensures that the cover plate 9 is heated evenly over the surface thereof.
- the light absorption segments can be strip-shaped or rectangular or oval-shaped.
- the light absorbent 10 can also be designed as a thermochromic admixture within the base material 11.
- the light absorbent is introduced into the material of the cover plate 9 during the manufacture of the cover plate 9, for example as color pigments.
- the temperature dependency of the light absorbent 10 can be seen from FIG. Above a limit temperature T G , a degree of absorption A of the light absorption by means of 10 is zero or in the vicinity of zero. Thus, above this limit temperature T G, no luminous flux 8 entering the cover plate 9 is absorbed. The transmittance of the light is virtually 100%, so that the entering light flux 8 essentially corresponds to a light flux 8 exiting from the cover plate 9. The luminous flux 8 is therefore not influenced by the cover lens 9, see FIG. 1.
- a temperature T of the cover lens 9 is below the limit tempera ture T G , after the light source 2 is switched on, the light absorbent 10 is activated, with part of the luminous flux 8 entering the cover lens 9 being absorbed and converted into thermal energy according to an absorption characteristic curve K in FIG is changing.
- T G the limit tempera ture
- the degree of absorption is 50%, so that only a luminous flux 8 ′ is allowed to pass through the cover lens 9, which corresponds to 50% of the luminous flux 8 of the incoming luminous flux 8.
- the degree of absorption A increases linearly with a decrease in the temperature T starting from the limit temperature T G.
- the steepness of the absorption characteristic curve K depends on the "doping" of the light absorbent 10 on the cover lens 9. The greater the concentration of the light absorbent means 10 on or in the cover plate 9, the steeper the characteristic absorption line K increases.
- the limit temperature T G is 4 ° C. According to an alternative embodiment, the limit temperature T G can also be varied.
- the limit temperature T G is preferably in a range between 0 ° C. and 6 ° C.
- An activation area 12 in which the light absorbent 10 unfolds its effect is thus in a range below the limit temperature T G , preferably in a temperature range between -2 ° C and 6 ° C. When the temperature T is reduced further, the light absorbent 10 saturates.
- the light intensity of the light source 2 is selected such that even at a low temperature T below the limit temperature T G , i.e. in the activation temperature range 12 of the light absorbent 10, the luminous flux 8 'transmitted through the cover plate 9 is so great that the statutory minimum requirements with regard to a minimum luminous flux are met.
- the cover plate 9 can be provided with a temperature-dependent wavelength shifting means, with spectral components of the light being partially and / or completely shifted into an infrared wavelength range as a function of the temperature.
- the spectral color components of the light are shifted in the direction of the infrared wavelength range so that part of the luminous flux can be used to heat the cover lens 9.
- the light absorber 10 can also be arranged on an outer side 13 (flat side) of the base material 11 or the cover plate 9. List of reference symbols
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019129592.0A DE102019129592A1 (de) | 2019-11-04 | 2019-11-04 | Beleuchtungsvorrichtung für Fahrzeuge |
PCT/EP2020/080420 WO2021089411A1 (de) | 2019-11-04 | 2020-10-29 | Beleuchtungsvorrichtung für fahrzeuge |
Publications (3)
Publication Number | Publication Date |
---|---|
EP4055321A1 true EP4055321A1 (de) | 2022-09-14 |
EP4055321B1 EP4055321B1 (de) | 2023-08-23 |
EP4055321C0 EP4055321C0 (de) | 2023-08-23 |
Family
ID=73452159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20807673.7A Active EP4055321B1 (de) | 2019-11-04 | 2020-10-29 | Beleuchtungsvorrichtung für fahrzeuge |
Country Status (4)
Country | Link |
---|---|
US (1) | US11725797B2 (de) |
EP (1) | EP4055321B1 (de) |
DE (1) | DE102019129592A1 (de) |
WO (1) | WO2021089411A1 (de) |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3936374C2 (de) * | 1989-11-02 | 1999-06-10 | Bayerische Motoren Werke Ag | Kraftfahrzeugscheinwerfer mit abtaubarer Abdeckscheibe |
JPH04162302A (ja) * | 1990-10-24 | 1992-06-05 | Ricoh Co Ltd | 照明装置 |
JP4474649B2 (ja) * | 2005-05-23 | 2010-06-09 | スタンレー電気株式会社 | 車両用灯具 |
US7465693B2 (en) * | 2006-09-13 | 2008-12-16 | Flint Trading, Inc. | Thermochromatic temperature marking for outdoor surfaces |
DE102010013559B4 (de) * | 2010-03-31 | 2019-10-31 | HELLA GmbH & Co. KGaA | Beleuchtungsvorrichtung für Fahrzeuge |
DE102011080489B4 (de) * | 2011-02-15 | 2016-03-17 | Automotive Lighting Reutlingen Gmbh | Kraftfahrzeugscheinwerfer |
GB201121657D0 (en) * | 2011-12-16 | 2012-01-25 | Land Instr Int Ltd | Radiation thermometer |
DE202012005627U1 (de) * | 2012-06-06 | 2012-06-28 | Automotive Lighting Reutlingen Gmbh | Beleuchtungseinrichtung eines Kraftfahrzeugs |
DE102014110841A1 (de) | 2014-07-31 | 2016-02-04 | Hella Kgaa Hueck & Co. | Beleuchtungseinrichtung mit einer Einrichtung zur Enttauung und/oder Enteisung der Abschlussscheibe |
CN107923596B (zh) * | 2015-09-03 | 2020-12-04 | 株式会社小糸制作所 | 水加热装置以及使用了该水加热装置的灯具 |
DE102017003398A1 (de) * | 2017-04-07 | 2018-10-11 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Kraftfahrzeugscheinwerfer, Kraftfahrzeugscheinwerfersystem sowie Kraftfahrzeug |
DE102019121358A1 (de) * | 2019-08-07 | 2021-02-11 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Licht emittierendes fensterelement und kraftfahrzeug mit licht emittierendem fensterelement |
-
2019
- 2019-11-04 DE DE102019129592.0A patent/DE102019129592A1/de active Pending
-
2020
- 2020-10-29 EP EP20807673.7A patent/EP4055321B1/de active Active
- 2020-10-29 WO PCT/EP2020/080420 patent/WO2021089411A1/de unknown
-
2022
- 2022-05-03 US US17/735,192 patent/US11725797B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP4055321B1 (de) | 2023-08-23 |
EP4055321C0 (de) | 2023-08-23 |
US20220260230A1 (en) | 2022-08-18 |
DE102019129592A1 (de) | 2021-05-06 |
WO2021089411A1 (de) | 2021-05-14 |
US11725797B2 (en) | 2023-08-15 |
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