EP2151144A2 - Phare pour un véhicule automobile - Google Patents

Phare pour un véhicule automobile

Info

Publication number
EP2151144A2
EP2151144A2 EP08748980A EP08748980A EP2151144A2 EP 2151144 A2 EP2151144 A2 EP 2151144A2 EP 08748980 A EP08748980 A EP 08748980A EP 08748980 A EP08748980 A EP 08748980A EP 2151144 A2 EP2151144 A2 EP 2151144A2
Authority
EP
European Patent Office
Prior art keywords
layer
headlight according
lens
elements
headlight
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.)
Ceased
Application number
EP08748980A
Other languages
German (de)
English (en)
Inventor
Roman Nyderle
Thomas Preussner
Torsten Kopte
Volker Kirchhoff
Sabine DREIHÖFER
Ralf Rochotzki
Dieter Jestel
Matthias Kalwa
Klaus-Dieter Steinborn
Michael Falz
Bernd Bücken
Barbara Gebhardt
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP2151144A2 publication Critical patent/EP2151144A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/005—Heaters using a particular layout for the resistive material or resistive elements using multiple resistive elements or resistive zones isolated from each other
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings

Definitions

  • the invention relates to a headlight for a motor vehicle.
  • headlights in the sense of the invention includes all lighting devices of a motor vehicle for generating light or for generating optical signals for other road users such as front and reverse lights, fog lights, headlamps of additional lighting, headlamps for parking lights, brake lights or indicators.
  • incandescent lamps or so-called halogen lamps have been used as illuminants for motor vehicle headlights. Their thermal radiation was sufficient to melt ice on a headlight surface or to prevent frost or dew deposition. Recently, however, more and more of these bulbs are displaced in the automotive field by the use of LEDs, which have a lower energy consumption. This lower energy requirement is not least due to a lower heat radiation of these components.
  • DE 197 24 098 A1 discloses a headlight for a motor vehicle, in which a heating device is formed on the inside of the headlight pane.
  • the heater may be, for example, an electrically conductive metal layer, which generates heat when current flows and ensures in this way that, for example, the icy headlight lens can be defrosted.
  • a disadvantage of such a solution is that the light transmission of a metal layer is insufficient and thus the luminous efficacy of such a headlamp is severely limited.
  • the invention is therefore the technical problem of a headlamp for a motor vehicle and to provide a method for its production, by means of which the disadvantages of the prior art are overcome.
  • the headlight cover disc should have a high transmission in the visible light wave range and de-icing of the headlight cover disc even with the use of LEDs as a light source be possible.
  • An inventive headlight for a motor vehicle comprises a cover plate, which as part of a housing closes an enclosed by the housing interior to the environment, wherein on the interior side facing the lens cover a layer system comprising a lower layer, followed by a metal layer and an upper layer is deposited.
  • the lower layer and / or the upper layer consists either of a nitride of the elements Al or Si or of an oxide of the elements Si, Ti Al, Zn, Sn, In, Nb, Zr, Ta or of a mixed oxide at least two of aforementioned elements.
  • the transmission is reduced by about 40% compared to an uncoated lens.
  • a headlamp according to the invention cause the lower and the upper layer, which have a lower refractive index of light compared to the enclosed metal layer, a reduction in the transmission of light in the wavelength range of 500 to 700 nm compared to an uncoated lens of not more than 20%. Often this reduction is even less than 10%. The light output of a headlamp is thereby significantly increased.
  • the metal layer sandwiched between the lower and upper layers may be used as a heating element when flowed through by a current.
  • a lens can de-iron or can be counteracted a rime or Tauablagerung.
  • An embodiment in which the upper and / or lower layer is formed as a nitride also includes those variants in which the layer has an oxygen content and is thus formed as an oxynitride.
  • the oxygen content may in turn have a gradient in the course of the layer thickness.
  • the upper layer and / or the lower layer is deposited as oxide or mixed oxide, then it may also be doped with one or more of the elements Al, F, B, P, Ce, Sn, Zn or S.
  • layer thicknesses of 20 nm to 70 nm are suitable in order to ensure a high transmission of the layer system.
  • the lens of a headlamp according to the invention may consist of glass or of a transparent plastic, such as PC, PMMA or APEC and have a thickness of about 0.5 to 5 mm.
  • the metal layer of the layer system also functions as a heating element, elements which conduct the electric current well, such as Ag, Al, Cu, Au, Pd or Pt are suitable as a layer former.
  • the metal layer which preferably has a layer thickness of 5 nm to 20 nm, can be formed only from one of these elements or an alloy of these elements.
  • the layer system has a sheet resistance R D of 1 to 100 ⁇ / ⁇ .
  • R D sheet resistance
  • a layer system is therefore deposited with a sheet resistance R D of 5 to 20 ⁇ / G on a lens.
  • the metal layer is to be used as a heating element, it is necessary to provide the metal layer with electrical contacts.
  • conductive contact elements such as contact strips with electrical Contact to the metal layer be attached.
  • the contact strips are preferably arranged in edge regions and on opposite sides of the cover disk. Modern designs of headlamps entail that the outer shape of a lens does not have a simple rectangular structure.
  • the metal layer is therefore formed inhomogeneous with respect to the layer thickness in dependence on the geometry of a cover disk such that approximately constant resistance values are achieved between opposing contact strips.
  • the layer system can be subdivided on the surface of a lens into segments which can have any geometric shape, each segment being contacted separately and being subjected to electrical parameters for heating separately.
  • the layer system segments are formed from each other electrically insulated.
  • the layer system in the individual segments can also be formed with a constant thickness and the electrical parameters with which a segment is subjected to heating, be set according to the resistance value of the associated segment. If a homogeneous layer is to be formed, it is advantageous if the fluctuation range of the layer thickness is less than ⁇ 20%. If the layer system is divided into segments, however, the layer thicknesses can also vary from segment to segment.
  • the transmission in the visible light range and / or in the infrared range can also vary from segment to segment. This is advantageous, for example, when a sensor, such as an infrared sensor, is to be arranged behind a segment and requires certain transmission values. In this case, it may also be necessary that no coating of a cover disk takes place at all in a segment region. Since in a motor vehicle headlamp more and more of the visual impression is important, a contact strip, which is located on the metal layer, by an additional and decorative metal layer, which may for example consist of steel or chrome, be covered.
  • an adhesion layer may be deposited between the end plate and the lower layer.
  • Such an adhesive layer may for example consist of an oxide of the elements Al, Ti or Cr.
  • a cover layer which may be, for example, a plasma polymerization layer or a lacquer layer, on the upper layer.
  • a cover layer may be formed, for example, as a diffusion barrier layer to prevent corrosion, or it may serve to stabilize the layer system.
  • a cover layer can have an additional reflection-reducing effect.
  • the color location of the light passing through the lens is within the white range prescribed in ECE R1 12.
  • An inventive method for producing a headlamp for a motor vehicle, with a lens, which closes as part of a housing enclosed by the housing interior to the environment, is characterized in that on the interior side facing the lens cover a layer system comprising a lower layer, followed by a metal layer and an upper layer, is deposited by vacuum deposition, wherein the lower layer and / or the upper layer either as a nitride of the elements Al or Si or as an oxide or a mixed oxide of the elements Si, Ti Al, Zn, Sn, In, Nb, Zr or Ta is deposited.
  • the oxide or the mixed oxide doped with one or more of the elements Al, F, B, P, Ce, Sn, Zn or S and the metal layer of one or more of the elements Ag, Al, Cu, Au, Pd or Pt are deposited.
  • the lower and upper layers should be deposited with a thickness of 20 nm to 70 nm and the metal layer with a thickness of 5 nm to 20 nm.
  • both CVD methods and PVD methods such as vapor deposition or sputtering
  • vapor deposition or sputtering are suitable.
  • sputtering processes feeds.
  • a sputtering device without a magnetic field generating device can be used, in which the target is adapted to the shape of the lens.
  • a sputtering device having a magnetic field generating device can be used and either the sputtering device can be moved relative to the cover disk surface to be coated or the cover disk can be moved relative to the sputtering device to cover all surface sections of the cover disk with a homogeneous coating or even a deliberately inhomogeneous one To provide coating.
  • Another alternative is to coat the lens in segments. This can be done, for example, by using a coating device and after the coating of a segment, the lens is repositioned and then the next segment is coated. However, it is also possible to arrange a plurality of coating devices in such a way that several and possibly also all segments are coated simultaneously.
  • both an adhesive layer between the cover disk and the lower layer and a cover layer on the upper layer can be deposited.
  • Fig. 2 is a schematic front view of the lens of an inventive
  • Tab. 1 shows the layer materials with their layer thicknesses and a determined sheet resistance for the respective layer system.
  • the abbreviations used in Tab. 1 are "ITO” for indium tin oxide and "AZO" for aluminum zinc oxide. All layers were deposited by magnetron sputtering, using a single DC magnetron for Ag and ITO layers and a double magnetron with a center frequency of 25 kHz for AZO, TiO 2 and Nb 2 O 5 layers ,
  • the transparency of the four coated samples is plotted over a range of wavelengths relative to an uncoated PC substrate. It can be seen from the curves shown that all four coated PC substrates in the relevant wavelength range from 500 nm to 700 nm have a transparency of at least 90%. opposite to an uncoated PC substrate, which in turn means that the four layer systems cause a reduction in transparency of less than 10%, which is why a lens with one of these layer systems allows excellent luminous efficiency.
  • a cover plate 1 of a motor vehicle headlight according to the invention is shown schematically in Fig. 2 in a front view.
  • a layer system according to Example 1 from Table 1 with a homogeneous layer thickness distribution has been deposited on the lens 1.
  • the layer system is divided into elongated segments 2, wherein the individual segments 2 of the layer system are formed electrically insulated from each other.
  • the Ag layer in each segment 2 is provided with a contact strip 3.
  • the contact strips are arranged in an edge region of the cover plate 1, which is covered in the installed state by other components of the associated headlight housing and / or the motor vehicle body.
  • the layer system in the segments 2 can also be deposited with different layer thickness such that the layer system in the segments 2 between the contact strips 3 have an at least approximately the same electrical resistance value. Then the contact strips 3 of the individual segments 2 can be acted upon with the same electrical parameters.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

L'invention concerne un phare destiné à un véhicule automobile et comprenant une vitre de fermeture qui, en tant que composant d'un boîtier, isole du milieu ambiant un espace intérieur renfermé par le boîtier. Un système de couches comprenant une couche inférieure suivie d'une couche métallique et d'une couche supérieure est déposé par des procédés sous vide sur la face, orientée vers l'espace intérieur, de la vitre de fermeture, la couche inférieure et/ou la couche supérieure étant déposées soit en tant que nitrure des éléments AI ou Si soit en tant qu'oxyde ou qu'oxyde mixte des éléments Si, Ti, AI, Zn, Sn, In, Nb, Zr ou Ta.
EP08748980A 2007-04-27 2008-04-18 Phare pour un véhicule automobile Ceased EP2151144A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007019995 2007-04-27
PCT/EP2008/003120 WO2008135148A2 (fr) 2007-04-27 2008-04-18 Phare pour un véhicule automobile
DE102008019664A DE102008019664A1 (de) 2007-04-27 2008-04-18 Scheinwerfer für ein Kraftfahrzeug und Verfahren zum Herstellen desselben

Publications (1)

Publication Number Publication Date
EP2151144A2 true EP2151144A2 (fr) 2010-02-10

Family

ID=39777775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08748980A Ceased EP2151144A2 (fr) 2007-04-27 2008-04-18 Phare pour un véhicule automobile

Country Status (4)

Country Link
US (1) US20100091510A1 (fr)
EP (1) EP2151144A2 (fr)
DE (1) DE102008019664A1 (fr)
WO (1) WO2008135148A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010013559B4 (de) * 2010-03-31 2019-10-31 HELLA GmbH & Co. KGaA Beleuchtungsvorrichtung für Fahrzeuge
EP2405708A1 (fr) * 2010-07-07 2012-01-11 Saint-Gobain Glass France Plaque transparente dotée d'un revêtement pouvant être chauffé
ES2611662T3 (es) 2010-07-07 2017-05-09 Saint-Gobain Glass France Cristal compuesto con un revestimiento eléctricamente calentable
DE102011080489B4 (de) * 2011-02-15 2016-03-17 Automotive Lighting Reutlingen Gmbh Kraftfahrzeugscheinwerfer
ES2643181T3 (es) * 2011-12-20 2017-11-21 Saint-Gobain Glass France Cubierta de luminaria calefactable
CN110027510B (zh) 2014-04-28 2022-05-10 Ａｇｃ株式会社 电加热窗用板状体
DE102019111546A1 (de) 2019-05-03 2020-11-05 Irlbacher Blickpunkt Glas Gmbh Leuchte mit einer Beschichtung zur Enteisung
CN116034232A (zh) 2020-09-28 2023-04-28 海拉有限双合股份公司 用于车辆照明装置的盖透镜
DE102022109687A1 (de) 2022-04-21 2023-10-26 Irlbacher Blickpunkt Glas Gmbh Abdeckung aus Glas mit einer Beschichtung zur Enteisung
DE102022122285A1 (de) 2022-09-02 2024-03-07 HELLA GmbH & Co. KGaA Kunststoffabschlussscheibe für eine Beleuchtungseinrichtung eines Kraftfahrzeugs und Verfahren zur Herstellung einer Kunststoffabschlussscheibe

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US2878357A (en) * 1956-07-13 1959-03-17 Gen Dynamics Corp Electric heated laminated glass panel
US4828346A (en) * 1985-10-08 1989-05-09 The Boc Group, Inc. Transparent article having high visible transmittance
US4844985A (en) * 1986-10-06 1989-07-04 Ford Motor Company Electrically heated transparent glass article and method of making
DE3707214A1 (de) * 1987-03-06 1988-09-15 Hoechst Ag Beschichtete kunststoffolie und daraus hergestelltes kunststofflaminat
JPH0791089B2 (ja) * 1988-12-13 1995-10-04 セントラル硝子株式会社 熱線反射ガラス
US5506037A (en) * 1989-12-09 1996-04-09 Saint Gobain Vitrage International Heat-reflecting and/or electrically heatable laminated glass pane
DE4006804A1 (de) * 1990-03-03 1991-09-05 Renker Gmbh & Co Kg Zweigniede Mehrschichtsystem mit hohem reflexionsvermoegen im infrarot-spektralbereich und mit hohem transmissionsvermoegen im sichtbaren bereich
US5559614A (en) * 1995-05-01 1996-09-24 Motorola, Inc. Liquid crystal display with integral heater and method of fabricating same
DE19724098A1 (de) * 1997-06-07 1998-12-10 Bayerische Motoren Werke Ag Scheinwerfer für ein Kraftfahrzeug
US6379509B2 (en) * 1998-01-20 2002-04-30 3M Innovative Properties Company Process for forming electrodes
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DE20021657U1 (de) * 2000-12-20 2002-05-02 Alanod Al Veredlung Gmbh Abdeckteil für eine Lichtquelle
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Also Published As

Publication number Publication date
DE102008019664A1 (de) 2008-10-30
US20100091510A1 (en) 2010-04-15
WO2008135148A2 (fr) 2008-11-13
WO2008135148A3 (fr) 2009-01-22

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Inventor name: GEBHARDT, BARBARA

Inventor name: BUECKEN, BERND

Inventor name: FALZ, MICHAEL

Inventor name: STEINBORN, KLAUS-DIETER

Inventor name: KALWA, MATTHIAS

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Inventor name: ROCHOTZKI, RALF

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