WO2016070968A1 - Projecteur pour un véhicule automobile - Google Patents

Projecteur pour un véhicule automobile Download PDF

Info

Publication number
WO2016070968A1
WO2016070968A1 PCT/EP2015/002128 EP2015002128W WO2016070968A1 WO 2016070968 A1 WO2016070968 A1 WO 2016070968A1 EP 2015002128 W EP2015002128 W EP 2015002128W WO 2016070968 A1 WO2016070968 A1 WO 2016070968A1
Authority
WO
WIPO (PCT)
Prior art keywords
light beam
primary light
optical mirror
optical
wavelength distribution
Prior art date
Application number
PCT/EP2015/002128
Other languages
German (de)
English (en)
Inventor
Carsten Gut
Wolfgang Huhn
Original Assignee
Audi Ag
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 Audi Ag filed Critical Audi Ag
Publication of WO2016070968A1 publication Critical patent/WO2016070968A1/fr

Links

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
    • 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
    • F21S41/16—Laser light sources
    • 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
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/37—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors characterised by their material, surface treatment or coatings
    • 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
    • F21S45/10—Protection of lighting devices
    • 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
    • F21S45/70—Prevention of harmful light leakage

Definitions

  • the invention relates to a headlamp for a motor vehicle, comprising a light source for emitting a primary light beam of a first wavelength distribution, with a converter element for converting the primary light beam into a secondary light radiation having a higher wavelength, with a reflector element for reflecting the secondary light beams in a predetermined direction and with a optical absorption element.
  • Modern headlights make it possible in the field of motor vehicles to provide high luminances.
  • the optical efficiency of an optical system can be improved, for example by the small etendue of laser-based light sources.
  • the principle of operation of such modern headlamps for example, by laser light, based here on a wavelength conversion with a fluorescent converter element, which is illuminated, for example, with a blue laser and excited to emit light.
  • a beam absorber as optical Absorpti- onselement in the system.
  • DE 0 2012 220 481 A1 describes a light module for a motor vehicle headlight with a laser light source which emits a primary light bundle, with a photoluminescent element which is illuminated by the primary light beam and by which the incident primary light beam is converted into a secondary light distribution by utilizing photoluminescence , as well as with an Abstrahloptik adopted, which transforms the secondary light distribution in a Abstrahllichtver Irish the light module. It is an object of the present invention to provide an improved headlamp with increased optical efficiency for a motor vehicle. This object is solved by the subject matter of the independent claim. Advantageous embodiments will become apparent from the dependent claims, the description and the figures.
  • a headlight for a motor vehicle comprises a light source for emitting a primary light beam, a converter element for converting the primary light beam into secondary light radiation having a higher wavelength, a reflector element for reflecting the secondary light radiation in a predetermined spatial direction and an optical absorption element.
  • the primary light beam has a first wavelength distribution and the secondary light radiation has a second wavelength distribution that is different from the first wavelength distribution.
  • the converter element may be a fluorescent converter element, for example a converter element containing cerium-doped yttrium aluminum garnet to convert the primary light beam into the secondary light radiation.
  • the converter element is also designated by the English term "phosphor.”
  • the converter element is arranged in the beam path of the primary light beam between the light source and the reflector element and the optical absorption element in an extension of the primary light beam through the converter element.
  • the absorption element comprises an optical mirror which, due to its optical properties, absorbs and / or transmits most of the light of the first wavelength distribution and reflects most of the light of the second wavelength.
  • the optical mirror can also substantially completely absorb and / or transmit light of the first wavelength distribution and reflect light of the second wavelength.
  • the primary light beam strikes the absorption element and is thus absorbed and / or transmitted by it.
  • the secondary light radiation which corresponds to the first wavelength distribution, that is, for example, blue components, are swallowed by the optical mirror, that is, absorbed or transmitted.
  • the secondary light radiation which strikes the absorption element, in contrast to the prior art nor an optical use, whereby the optical efficiency of the headlamp is increased.
  • the primary light beam prevents the headlamp from leaving in a direction provided for the secondary light radiation, for example in the direction of a road or a viewer, which could be endangered by the primary light beam. This safe operation is possible without the risk of glare even in the case of a damaged or broken converter element.
  • the optical mirror is a dichroic mirror.
  • the dichroic mirror may be an optical interference mirror. This has the advantage that the light can be filtered as a function of the wavelength via a benefit of interference effects and thus a very accurate adjustment of reflected and transmitted or absorbed wavelengths is possible.
  • the optical mirror can be adjusted so precisely to the wavelength of the primary light beam, so that it absorbs the light of the primary light beam with high accuracy or transmits and light of substantially all other wavelengths, in particular in the visible range, reflected and so makes usable by the headlight.
  • the second wavelength distribution comprises for the most part, in particular exclusively, wavelengths which are greater than 450 nm or 455 nm, in particular greater than 470 nm or also, in particular, greater than 500 nm.
  • the first wavelength distribution for the most part in particular exclusively, comprises wavelengths which are smaller than 450 nm or 455 nm, alternatively also smaller than 470 nm, and again alternatively smaller than 500 nm.
  • the latter two alternative values are advantageous here if the limit value for the second wavelength distribution, as described in the above paragraph, is 470 nm or 500 nm.
  • the two wavelength distributions can be separated particularly easily and with a high optical efficiency.
  • the first wavelength distribution characterizes a monochromatic light.
  • the use of light having a short wavelength for the primary light beam allows the primary light beam to be converted into white secondary light radiation.
  • the light source comprises a laser light source and the primary light beam comprises a laser light of a predetermined wavelength.
  • the optical mirror can be adjusted very accurately to transmitting the primary light beam and reflecting the remaining light, so that the optical efficiency of the headlamp is improved. Due to the high luminance, the primary light beam can also have a small diameter and the absorption element can be made small.
  • the absorption element comprises a hole-like beam trap and the optical mirror in a Extension of the primary light beam between the converter element and the beam trap is arranged.
  • This has the advantage that light transmitted by the optical mirror can not transmit the optical mirror again in an opposite direction.
  • a return of a transmitted primary light beam or a portion thereof is excluded in a region between the optical mirror and the converter element and achieved a high level of security.
  • the optical mirror is arranged on the reflector element. Behind the mirror can then be realized in the reflector element, the hole-like beam trap.
  • the reflector element can reflect more of the secondary light radiation, which improves the optical efficiency of the system.
  • a reflective surface of the optical mirror is flush with a reflective surface of the reflector element, so that the reflective surface of the reflector element is steadily continued by the reflective surface of the optical mirror.
  • a geometry of the reflector element can be picked up by the optical mirror, for example, a reflecting surface of the reflector element can have a parabolic geometry, which is then picked up by the reflecting surface of the optical mirror, so that the light distribution desired by the parabolic shape through the reflector optical mirror is not disturbed, but remains intact.
  • a geometric extension of the optical mirror perpendicular to an extension of the primary light beam to a diameter of the primary light beam. Beam is adjusted.
  • the optical mirror can therefore be adapted to the diameter of the primary light beam at the location of the optical mirror in the case of a damaged or nonexistent converter element. It can thus be made in the smallest possible size in which the full primary light beam strikes it. It can also be adapted to the beam profile of the primary light beam, and for example, not cover an edge region of the primary beam, in which only a very small, eg blue, radiation is present. This has the advantage that a possibly disturbing color effect, which may possibly be due to the absorption properties of the optical mirror when the converter element is intact in a light emitted by the headlight, is minimized.
  • the invention also includes a motor vehicle with a headlamp according to one of the preceding claims.
  • FIG. 1 is a schematic sectional view of an exemplary embodiment of a headlamp with an intact converter element
  • Fig. 2 is a schematic sectional view of the headlamp of Fig. 1 with a damaged converter element.
  • Fig. 1 shows a schematic sectional view of an exemplary embodiment of a headlamp for a motor vehicle.
  • the headlight 1 here has a light source 2, which is embodied here as a laser light source. It emits a primary light beam 3 with a predetermined wavelength here, for example 450 nm or 400 nm.
  • the primary light beam 3 is directed by a deflecting element 4, for example a mirror, onto a focusing element 5, for example a lens.
  • This focus element 5 focuses the primary light beam 3 at a focal point 6.
  • a converter element 7 is arranged in the present case.
  • a reflector element 9 and an optical absorption element 10 with an optical mirror 11 is arranged.
  • the converter element 7 converts the primary light beam 3 into a secondary light radiation 8, which has a greater wavelength compared to the primary light beam 3 and in the present case is emitted diffusely in a multiplicity of spatial directions by the converter element 7.
  • the secondary light radiation 8 strikes the reflector element 9 as well as the optical absorption element 10 with the optical mirror 11.
  • the reflector element 9 in the example shown has a reflective surface 12 facing the converter element 7, which here has the shape of a parabolic section or in the three-dimensional embodiment a parabolic mirror segment has.
  • the focal point of the focusing element 5 is also the focal point 6 of the parabolic mirror segment, so that the diffused secondary light radiation 8 is efficiently directed in a given direction x, in the present example a direction of travel of a motor vehicle, via the converter element 7 arranged in the focal point 6.
  • the absorption element 10 is here arranged on the reflector element 9, specifically in the direct extension of the primary light beam 3 impinging on the converter element 7.
  • the absorption element 10 comprises an optical mirror 11, which is embodied here as a dichroic mirror, and in this example a Hole-like beam trap 13.
  • the optical mirror 11 transmits via interference effects light of a first wavelength distribution and correspondingly reflects light of a second wavelength distribution.
  • the optical mirror 11 is designed so that it has a light with a Wavelength, as it has the primary light beam 3, transmitted and reflected substantially all other wavelengths.
  • a reflective surface 14 of the optical mirror 11 adjoins here flush with the reflective surface 12 of the reflector element 9, so that in the example shown, the parabolic-mirror-like, generally geometric, shape of the reflector element 9 or its reflecting surface 14 through the optical mirror 11 will continue.
  • optical aberrations caused by the optical mirror 11 in the light emitted from the headlight 1 are avoided.
  • the secondary light radiation 8 striking the surface 14 is therefore reflected by the absorption element 10, more precisely by the reflecting surface 14 of the optical mirror 11, in a manner almost identical to that of the reflecting surface 12 of the reflector element 9 and thus also deflected in the predetermined direction x and fed to a use.
  • the optical efficiency of the headlamp 1 thus lies, apart from the present case, the blue component close to an ideal optical efficiency which would be achieved if the reflector element 9 did not have an absorption element 10 but would be designed to be continuous with the reflective surface 12.
  • FIG. 2 the headlight of Fig. 1 with a damaged, broken here, converter element 7 is shown. Since the converter element 7 is broken, the primary beam 3 is no longer converted by the converter element 7 into the secondary radiation 8 (FIG. 1). The primary beam 3 moreover strikes the optical absorption element 10 in its extension through the broken converter element 7.

Landscapes

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

Abstract

L'invention concerne un projecteur (1) pour un véhicule automobile, avec une source de lumière (2) pour rayonner un faisceau lumineux primaire (3) ayant une première distribution de longueurs d'onde, avec un élément de conversion (7) pour la conversion du faisceau lumineux primaire (3) en un faisceau lumineux secondaire (8) ayant une seconde distribution de longueurs d'onde, avec un élément réfléchisseur (9) pour la réflexion du faisceau lumineux secondaire (8) dans une direction prédéfinie et avec un élément d'absorption optique (10). L'élément de conversion (7) est disposé dans la trajectoire du faisceau lumineux primaire (3) entre la source de lumière (2) et l'élément réfléchisseur (9), l'élément d'absorption optique (10) est disposé dans une prolongation du faisceau lumineux primaire (3) à travers l'élément de conversion (7) et l'élément d'absorption (10) comporte un miroir optique (11) qui absorbe et/ou transmet la majeure partie de la lumière de la première distribution de longueurs d'onde et réfléchit la majeure partie de la lumière de la seconde distribution de longueurs d'onde afin de fournir à un véhicule automobile un projecteur amélioré ayant un rendement optique accru.
PCT/EP2015/002128 2014-11-07 2015-10-27 Projecteur pour un véhicule automobile WO2016070968A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014016488.8A DE102014016488B4 (de) 2014-11-07 2014-11-07 Scheinwerfer für ein Kraftfahrzeug
DE102014016488.8 2014-11-07

Publications (1)

Publication Number Publication Date
WO2016070968A1 true WO2016070968A1 (fr) 2016-05-12

Family

ID=54364251

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/002128 WO2016070968A1 (fr) 2014-11-07 2015-10-27 Projecteur pour un véhicule automobile

Country Status (2)

Country Link
DE (1) DE102014016488B4 (fr)
WO (1) WO2016070968A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109140375A (zh) * 2017-06-16 2019-01-04 株式会社小糸制作所 车辆用灯具
US10317031B2 (en) 2015-04-15 2019-06-11 Koito Manufacturing Co., Ltd. Vehicle lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018205199B4 (de) 2018-04-06 2021-03-18 Volkswagen Aktiengesellschaft Ermittlung und Verwendung von Haltepunkten für Kraftfahrzeuge

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045314A1 (fr) * 1998-03-03 1999-09-10 New Option Lighting, Llc Systeme d'eclairage etanche a faisceau oriente
US20120106188A1 (en) * 2010-10-29 2012-05-03 Sharp Kabushiki Kaisha Light emitting device, illumination device, vehicle headlamp, and vehicle
US20120104934A1 (en) * 2010-10-29 2012-05-03 Sharp Kabushiki Kaisha Light emitting apparatus, vehicle headlamp, illuminating apparatus, and vehicle, and method for assembling the light emitting apparatus
EP2461092A2 (fr) * 2010-12-01 2012-06-06 Stanley Electric Co., Ltd. Phare de véhicule
EP2541130A2 (fr) * 2011-06-29 2013-01-02 Sharp Kabushiki Kaisha Dispositif de projection de lumière et phare de véhicule comprenant un tel dispositif de projection de lumière
JP2013101887A (ja) * 2011-11-09 2013-05-23 Sharp Corp 照明装置および車両用前照灯
JP2013187145A (ja) * 2012-03-09 2013-09-19 Stanley Electric Co Ltd 車両用灯具及び車両

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010062460A1 (de) 2010-12-06 2012-06-06 Osram Ag Leuchtvorrichtung
JP2013012358A (ja) 2011-06-28 2013-01-17 Sharp Corp 照明装置および車両用前照灯
DE102012220472A1 (de) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Kfz.-Beleuchtungsvorrichtung
DE102012220481A1 (de) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Lichtmodul
KR20160044157A (ko) 2014-10-14 2016-04-25 현대자동차주식회사 차량용 램프

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999045314A1 (fr) * 1998-03-03 1999-09-10 New Option Lighting, Llc Systeme d'eclairage etanche a faisceau oriente
US20120106188A1 (en) * 2010-10-29 2012-05-03 Sharp Kabushiki Kaisha Light emitting device, illumination device, vehicle headlamp, and vehicle
US20120104934A1 (en) * 2010-10-29 2012-05-03 Sharp Kabushiki Kaisha Light emitting apparatus, vehicle headlamp, illuminating apparatus, and vehicle, and method for assembling the light emitting apparatus
EP2461092A2 (fr) * 2010-12-01 2012-06-06 Stanley Electric Co., Ltd. Phare de véhicule
EP2541130A2 (fr) * 2011-06-29 2013-01-02 Sharp Kabushiki Kaisha Dispositif de projection de lumière et phare de véhicule comprenant un tel dispositif de projection de lumière
JP2013101887A (ja) * 2011-11-09 2013-05-23 Sharp Corp 照明装置および車両用前照灯
JP2013187145A (ja) * 2012-03-09 2013-09-19 Stanley Electric Co Ltd 車両用灯具及び車両

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10317031B2 (en) 2015-04-15 2019-06-11 Koito Manufacturing Co., Ltd. Vehicle lamp
CN109140375A (zh) * 2017-06-16 2019-01-04 株式会社小糸制作所 车辆用灯具
CN109140375B (zh) * 2017-06-16 2021-01-29 株式会社小糸制作所 车辆用灯具

Also Published As

Publication number Publication date
DE102014016488B4 (de) 2022-01-27
DE102014016488A1 (de) 2016-05-12

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