EP4055321B1 - Dispositif d'éclairage pour véhicules - Google Patents

Dispositif d'éclairage pour véhicules Download PDF

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Publication number
EP4055321B1
EP4055321B1 EP20807673.7A EP20807673A EP4055321B1 EP 4055321 B1 EP4055321 B1 EP 4055321B1 EP 20807673 A EP20807673 A EP 20807673A EP 4055321 B1 EP4055321 B1 EP 4055321B1
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EP
European Patent Office
Prior art keywords
temperature
cover lens
light
illumination device
accordance
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.)
Active
Application number
EP20807673.7A
Other languages
German (de)
English (en)
Other versions
EP4055321A1 (fr
EP4055321C0 (fr
Inventor
Stefan Gröne
Philipp Lott
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 GmbH and Co KGaA
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 GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Publication of EP4055321A1 publication Critical patent/EP4055321A1/fr
Application granted granted Critical
Publication of EP4055321C0 publication Critical patent/EP4055321C0/fr
Publication of EP4055321B1 publication Critical patent/EP4055321B1/fr
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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
    • F21S41/14—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 housing in which a light source and an optical unit for generating a predetermined light distribution are arranged, with a lens that closes an opening in the housing and through which light passes from an interior of the housing into an environment, with means for defrosting and/or de-icing the lens.
  • 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 in the light emission of 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 optics unit, is provided as a means for defrosting and/or deicing the cover lens.
  • the disadvantage of the known lighting device is that an additional consumer and control electronics are required for this purpose.
  • Other lighting devices for vehicles with means for defrosting and/or defrosting the cover pane are off DE 39 36 374 A1 and JP 2006 331650A known.
  • the object of the present invention is therefore to further 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 connection with the preamble of patent claim 1 is characterized in that the lens has a temperature-dependent light absorber, by means of which light is converted into heat depending on the temperature.
  • a temperature-dependent light absorber is integrated in a cover lens, so that at low temperatures the light energy introduced into the cover lens by the optical unit is converted into Thermal energy. At low temperatures, this thermal energy causes the cover lens to de-ice or defrost.
  • the installation space can advantageously be significantly reduced, since the light absorber is arranged directly on the cover lens and/or inside the cover lens.
  • no control of the light absorber is required.
  • the light absorber is transparent so that the appearance of the lighting device is not changed.
  • the basic idea of the invention is to act on the light radiation hitting the cover lens during operation of the lighting device in such a way that a small part of the light energy is converted into heat energy for defrosting or defrosting the cover lens and a large proportion of the light energy is let through for light emission.
  • the invention enables automatic conversion of part of the light energy provided by the light source into thermal energy for defrosting or defrosting the lens.
  • the light absorber is designed in such a way that when a limit temperature is exceeded, the degree of absorption of the light absorber is zero or close to zero. This ensures that the full luminous flux is available to generate 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 direction of light emission, which, however, is selected to be large enough to ensure the minimum requirements in terms of illuminance. At a temperature below the limit temperature, a maximum luminous flux is not emitted, but a luminous flux reduced to the same.
  • 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 from 20% to 80%, preferably 30% to 70%, of the maximum luminous flux. This means that 20% to 80% or 30% to 70%, in particular 50%, of the maximum luminous flux is converted into thermal energy.
  • the degree of absorption automatically falls to zero 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. and 6° C.
  • the limit temperature is preferably 4° C. In this way, reliable de-icing of the lens is ensured.
  • a light source is selected with such a luminous intensity that a minimum luminous flux exits through the cover lens when the cover lens temperature is below the limit temperature or in an operating temperature range of the vehicle. This advantageously satisfies the legal requirements.
  • the lens has at least partially a thermochromic layer and/or a thermochromic admixture.
  • the thermochromic layer can be applied as a film that preferably rests on an inside of the lens.
  • the thermochromic layer or the thermochromic admixture can have 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 lens has a temperature-dependent wavelength shifting means, by means of which spectral components of the light are partially or completely shifted into an infrared wavelength range depending on the temperature.
  • the lens can have a temperature-dependent wavelength shifting means, by means of which spectral components of the light passing through the lens into an infrared wavelength range is postponed. The resulting heat is used to defrost or de-ice the cover lens.
  • a lighting device for vehicles is preferably designed as a headlight, which is arranged in a front area of the vehicle.
  • the lighting device has a housing 1, inside 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 that are arranged on a circuit board 5 .
  • the optics unit 3 has primary optics 6 and secondary optics 7 arranged in front of the primary optics 6 in the main emission direction H, by means of which the luminous flux 8 detected by the light source 2 is forwarded in the direction of a lens 9 covering a front opening of the housing 1.
  • the secondary optics 7 are in the form of a lens which images the light entering on the side facing the light source 2 in accordance with a predetermined light distribution, for example low-beam light distribution.
  • the cover plate 9 is provided with a temperature-dependent light absorber 10, so that the luminous flux 8 impinging on the cover plate 9 is partially converted into thermal energy depending on the temperature.
  • the thermal energy heats up the cover disk 9 so that the cover disk 9 can be defrosted or defrosted.
  • the light absorber 10 thus serves as a means for defrosting and/or deicing the cover pane 9.
  • the light absorber is in the form of a thermochromic layer 10 which is applied to an inner side (flat side) of the cover lens 9 .
  • the inside of the cover lens 9 is arranged on a flat side of the cover lens 9 facing the optical unit 3 .
  • thermochromic layer is preferably in the form of a film which is applied to a base material 11 of the cover lens 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 lens 9 below a limit temperature T G .
  • the darkening of the cover plate 9 causes a partial conversion of the light energy provided by the light source 2 into heat energy, so that the cover plate 9 is heated up.
  • the base material 11 of the cover plate 9 can also only be partially provided with the light absorber 10 on the inside facing the optics unit 3 .
  • the light absorber 10 can be applied in segments to the inside of the cover lens 9 , with the light absorber segments preferably being arranged in an evenly distributed manner over the surface of the base material 11 . This ensures that the surface of the cover plate 9 is heated up evenly.
  • the light absorption segments can be strip-shaped or rectangular or oval-shaped.
  • the light absorber 10 can also be formed as a thermochromic admixture within the base material 11 .
  • the light absorber is introduced into the material of the cover plate 9 during the production of the cover plate 9, for example as color pigments.
  • the light absorber 10 is activated after the light source 2 is switched on, with an absorption characteristic curve K in figure 3 part of the luminous flux 8 entering the lens 9 is absorbed and converted into thermal energy.
  • T G the limit temperature
  • the degree of absorption is 50%, so that only a luminous flux 8′ is let through by the cover lens 9, which corresponds to 50% of the luminous flux 8 of the luminous flux 8 entering.
  • the degree of absorption A increases linearly with a reduction in the temperature T starting from the limit temperature T G .
  • the slope of the absorption characteristic K depends on the "doping" of the light absorber 10 on the cover plate 9. The greater the concentration of the light absorber 10 is on or in the lens 9, the steeper the absorption curve K rises.
  • 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 absorber 10 develops its effect is therefore in a range below the limit temperature T G , preferably in a temperature range between -2° C and 6° C. If the temperature T is further reduced, the light absorbent 10 runs into saturation.
  • the light intensity of the light source 2 is selected in such a way that even at a low temperature T below the limit temperature T G , i.e. in the activation temperature range 12 of the light absorber 10, the luminous flux 8' transmitted through the cover lens 9 is so large that the statutory Minimum requirements in terms of a minimum luminous flux are met.
  • the cover lens 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 temperature. Instead of light absorption, 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 for heating the cover lens 9 .
  • 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 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 for heating 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 lens 9 .

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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)

Claims (11)

  1. Dispositif d'éclairage pour véhicules
    - avec un boîtier (1) dans lequel sont disposées une source de lumière (2) et une unité optique (3) pour générer une répartition de lumière prédéfinie,
    - avec une glace (9) qui ferme une ouverture du boîtier (1) et à travers laquelle la lumière (8, 8') passe d'un espace intérieur du boîtier (1) dans un environnement,
    - avec des moyens (10) pour désembuer et/ou dégivrer la glace (9),
    caractérisé en ce que la glace (9) comprend un moyen d'absorption de lumière (10) en fonction de la température, au moyen duquel la lumière (8, 8') est convertie en chaleur en fonction de la température et qui sert de moyen pour désembuer et/ou dégivrer la glace (9).
  2. Dispositif d'éclairage selon la revendication 1, caractérisé en ce que le moyen d'absorption de lumière (10) est configuré de telle sorte qu'en cas de dépassement d'une température limite (TG), un taux d'absorption de lumière (A) est nul ou proche de zéro.
  3. Dispositif d'éclairage selon la revendication 1 ou 2, caractérisé en ce que le moyen d'absorption de lumière (10) est configuré de telle sorte que, en présence d'une température (T) de la glace (9) inférieure à la température limite (TG), le taux d'absorption de lumière (A) augmente avec la diminution de la température (T).
  4. Dispositif d'éclairage selon l'une des revendications 1 à 3, caractérisé en ce que le moyen d'absorption de lumière (10) est configuré de telle sorte qu'une courbe (K) du taux d'absorption (A) depuis une température (T) inférieure à 0° C en direction de la température limite (TG) présente une pente négative.
  5. Dispositif d'éclairage selon l'une des revendications 1 à 4, caractérisé en ce que la courbe (K) du taux d'absorption (A) décroît linéairement avec l'augmentation de la température (T) en direction de la température limite (TG).
  6. Dispositif d'éclairage selon l'une des revendications 1 à 5, caractérisé en ce que la température limite (TG) est comprise dans une plage allant de -2° C à 6° C.
  7. Dispositif d'éclairage selon l'une des revendications 1 à 6, caractérisé en ce que la température limite (TG) est de 4° C.
  8. Dispositif d'éclairage selon l'une des revendications 1 à 7, caractérisé en ce qu'une intensité lumineuse de la source de lumière (2) est choisie de manière à ce que, lorsque la température (T) de la glace (9) est inférieure à la température limite (TG), un flux lumineux minimal s'échappe dans l'environnement à travers la glace (9).
  9. Dispositif d'éclairage selon l'une des revendications 1 à 8, caractérisé en ce que le moyen d'absorption de lumière (10) se présente sous la forme d'une couche thermochrome (10) appliquée sur une face plane de la glace (9) et/ou en ce que le moyen d'absorption de lumière (10) se présente sous la forme d'un mélange thermochrome ajouté au matériau de la glace (9).
  10. Dispositif d'éclairage selon l'une des revendications 1 à 9, caractérisé en ce que la couche thermochrome (10) est posée sur la face intérieure de la glace (9).
  11. Dispositif d'éclairage pour véhicules
    - avec un boîtier (1) dans lequel sont disposées une source de lumière (2) et une unité optique (3) pour générer une répartition de lumière prédéfinie,
    - avec une glace (9) qui ferme une ouverture du boîtier (1) et à travers laquelle la lumière passe d'un espace intérieur du boîtier (1) dans un environnement,
    - avec des moyens (10) pour désembuer et/ou dégivrer la glace (9),
    caractérisé en ce que la glace (9) comprend un moyen de décalage de longueur d'onde en fonction de la température, au moyen duquel des parties spectrales de la lumière sont partiellement ou totalement décalées dans une plage de longueurs d'onde infrarouge en fonction de la température et qui sert de moyen pour désembuer et/ou dégivrer la glace (9).
EP20807673.7A 2019-11-04 2020-10-29 Dispositif d'éclairage pour véhicules Active EP4055321B1 (fr)

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 (fr) 2019-11-04 2020-10-29 Dispositif d'éclairage pour véhicules

Publications (3)

Publication Number Publication Date
EP4055321A1 EP4055321A1 (fr) 2022-09-14
EP4055321C0 EP4055321C0 (fr) 2023-08-23
EP4055321B1 true EP4055321B1 (fr) 2023-08-23

Family

ID=73452159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20807673.7A Active EP4055321B1 (fr) 2019-11-04 2020-10-29 Dispositif d'éclairage pour véhicules

Country Status (4)

Country Link
US (1) US11725797B2 (fr)
EP (1) EP4055321B1 (fr)
DE (1) DE102019129592A1 (fr)
WO (1) WO2021089411A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021250272A1 (fr) * 2020-06-12 2021-12-16 Motherson Innovations Company Ltd. Moyen fonctionnel pour dispositif d'imagerie, module d'éclairage, dispositifs de vue arrière, système d'aide à la conduite et véhicule

Family Cites Families (12)

* Cited by examiner, † Cited by third party
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
DE102011080488A1 (de) * 2011-02-15 2012-08-16 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
DE102014110841B4 (de) 2014-07-31 2024-08-29 HELLA GmbH & Co. KGaA Beleuchtungseinrichtung mit einer Einrichtung zur Enttauung und/oder Enteisung der Abschlussscheibe
WO2017038385A1 (fr) * 2015-09-03 2017-03-09 株式会社小糸製作所 Dispositif de chauffage d'eau et lampe l'utilisant
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

Also Published As

Publication number Publication date
WO2021089411A1 (fr) 2021-05-14
US11725797B2 (en) 2023-08-15
EP4055321A1 (fr) 2022-09-14
US20220260230A1 (en) 2022-08-18
EP4055321C0 (fr) 2023-08-23
DE102019129592A1 (de) 2021-05-06

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