EP3543596B1 - Module d'éclairage pour un phare de véhicule automobile - Google Patents

Module d'éclairage pour un phare de véhicule automobile Download PDF

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Publication number
EP3543596B1
EP3543596B1 EP18162863.7A EP18162863A EP3543596B1 EP 3543596 B1 EP3543596 B1 EP 3543596B1 EP 18162863 A EP18162863 A EP 18162863A EP 3543596 B1 EP3543596 B1 EP 3543596B1
Authority
EP
European Patent Office
Prior art keywords
light module
light
conversion
depressions
module according
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
EP18162863.7A
Other languages
German (de)
English (en)
Other versions
EP3543596A1 (fr
Inventor
Peter Hartmann
Christian BEMMER
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 EP18162863.7A priority Critical patent/EP3543596B1/fr
Priority to KR1020190030501A priority patent/KR102155540B1/ko
Priority to CN201910212544.7A priority patent/CN110307516B/zh
Publication of EP3543596A1 publication Critical patent/EP3543596A1/fr
Application granted granted Critical
Publication of EP3543596B1 publication Critical patent/EP3543596B1/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
    • 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
    • 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the invention relates to a light module for a motor vehicle headlight, which light module comprises a conversion means and a lighting means, which conversion means has a phosphor arranged on a carrier layer, the phosphor having a plurality of conversion segments which are formed by depressions in the phosphor, the lighting means being set up is to stimulate the conversion segments to emit light with a wavelength conversion, the depressions being designed as a coherent structure and being filled with a filler
  • the invention also relates to a motor vehicle headlight with at least one light module according to the invention.
  • conversion media are used in the emission direction of the laser device to convert essentially monochromatic light arranged in white or polychromatic light, “white light” being understood to mean light of such a spectral composition which gives people the color impression “white”.
  • This conversion medium is designed, for example, in the form of one or more photoluminescence converters or a luminescent material, with incident laser beams from the laser device impinging on the conversion medium, which usually has luminescent material, and stimulating this luminescent material or photoluminescent dye to photoluminescence, and light in one of the light of the incoming light Laser device is emitted different wavelengths or wavelength ranges.
  • the light output of the conversion medium essentially has the characteristics of a Lambertian radiator.
  • transmissive and transmissive relate here to the blue component of the converted white light.
  • transmissive the main direction of propagation of the blue light component after passing through the converter volume or conversion means is essentially in the same direction as the direction of propagation of the output laser beam.
  • reflective structure the laser beam is reflected or deflected at an interface attributable to the conversion medium, so that the blue light component has a different direction of propagation than the laser beam, which is usually designed as a blue laser beam.
  • Conversion materials or phosphors for example from the class of doped compounds with a garnet structure, such as Ce-doped yttrium aluminum garnet (Ce: YAG), are known from the prior art, with a variety of particles of different sizes in a binding matrix are assembled, which is fixed on a carrier with high thermal conductivity, for example made of sapphire.
  • Ce-doped yttrium aluminum garnet Ce: YAG
  • structure characterizes the nature of the totality of those partial volumes, each of which is homogeneous to a first approximation in terms of its composition and the spatial arrangement of its building blocks in relation to a fixed axis cross placed in the material.
  • the structure is characterized by the type, shape, size, distribution and orientation of the structural components.
  • multiphase ceramics for example Ce: YAG together with corundum, can function as scattering centers.
  • a promising measure for reducing the lateral widening of the luminous point, in particular in reflective systems, consists in a targeted subdivision of the luminescent material into individual segments, starting from an originally compact base ceramic.
  • Such segments - referred to below as conversion segments - are produced by indentations made in the phosphor.
  • a disadvantage of this structuring is that the mechanical strength and overall integrity are weakened, for example by microcracks or breakouts in the individual segments.
  • the depressions have at least one electrically conductive layer at least in certain areas
  • the light module furthermore has at least one measuring device which is set up to measure the resistance of the at least one electrically conductive layer.
  • this increases the contrast capability and also the mechanical stability of the conversion medium or of the phosphor.
  • the contrast properties can be adapted locally by varying the fill level of the filler arranged in the depressions.
  • the filler in the depressions prevents possible crosstalk of light beams onto an adjacent conversion segment, which also increases the contrast.
  • microcracks in the ceramic which arise from the structuring process, can be refilled or sealed, which also contributes to the stability of the overall structure.
  • a ceramic material for example, can be provided as the filler material.
  • insulation / ceramic layers can be applied using alkoxide sol / gel processes to achieve alumina / silica / mullite / zirconia / rutile deposits, which can also be mixed with one another and be more or less crystalline or stoichiometrically precise , whereby partially pre-packaged sols / gels (boehmite AlO (OH); Sasol Disperal®; Akzo Nobel Levasil®, ...) can be used.
  • partially pre-packaged sols / gels (boehmite AlO (OH); Sasol Disperal®; Akzo Nobel Levasil®, ...) can be used.
  • the porosity in particular can be controlled in order to adapt material-specific properties with regard to the thermal conductivity, the mechanical strength or the thermal expansion coefficient.
  • the phosphor used can, for example, be sintered polycrystalline or grown or drawn from a melt. Furthermore, a partially amorphous structure or even monocrystalline panes with subsequently introduced structures or imperfections as scattering centers are possible.
  • the cohesive structure of the depressions is achieved by means of a mechanical process, for example by sawing, laser ablation or focused ion beam.
  • the conversion segments obtained in this way - also called pixels - can have a width of approx. 50 ⁇ m and have a distance from one another of approx.
  • the depressions can have a depth of up to approx. 100 ⁇ m.
  • the depressions have at least one optically reflective layer, at least in some areas, i.e. that at least one electrically conductive and / or optically reflective layer is arranged at least in some areas between the filler and the depressions.
  • the at least one electrically conductive and / or optically reflective layer is arranged, for example, on the surface of the depressions.
  • “Surface” here means the walls or the bottom of the depressions and not the surface which forms the surface of the conversion segments.
  • This layer can preferably be deposited electrolessly from solutions of metal salts.
  • the solutions can be adjusted in terms of surface tension, viscosity, concentration and reaction-drying conditions, so that on the one hand the solutions reach the depressions preferably driven by capillary forces and use the walls there as germination zones, and on the other hand a good mirror is formed and If possible, no deposits occur on the light-emitting top side of the individual conversion segments, which would have to be removed in subsequent processing steps.
  • the light module furthermore has at least one measuring device which is set up to measure the resistance of the at least one electrically conductive layer, the resistance changing when the at least one electrically conductive layer breaks. By means of such a resistance measurement it can accordingly be determined whether a break in the phosphor itself or in the conversion segments has occurred.
  • the at least one electrically conductive layer or the resistance measurement of the at least one electrically conductive layer provides intrinsic monitoring of the functionality of the conversion medium.
  • a light-reflecting layer in the depressions can serve to avoid optical crosstalk between the respective conversion segments in order to improve the contrast.
  • a reflective intermediate layer can advantageously also be arranged between the conversion element and the carrier layer.
  • the material for the phosphor is from the group YAG: Gd, YAG-Ce, Y 2 O 3 -La 2 O 3 , MgAl 2 O 4 , Ca 2 Si 5 N 8 , Sr 2 Si 5 N 8 or Ba 2 Si 5 N 8 is selected.
  • the at least one layer is formed from metal, preferably from Ag, Cu, Pt, Pd, Ni or Al.
  • the lighting means can be designed as a laser device, preferably as a laser diode.
  • the light beams emitted by the lighting means can advantageously be steered onto the conversion segments via a deflection means, for example a movable mirror.
  • the light beams emitted by the lighting means can be deflected via the deflecting means, preferably a micromechanical mirror, in order to illuminate different areas of the conversion means.
  • the carrier layer is formed from a thermally conductive material, for example from sapphire.
  • Figures 1a and 1b show a light module for a motor vehicle headlight, which light module comprises a conversion means 100 and a lighting means 200 , which is designed as a laser device, preferably as a laser diode.
  • the conversion medium 100 has a luminescent material 120 arranged on a carrier layer 110 , which has a plurality of conversion segments 125 which are formed by depressions 130 in the luminescent material 120 , the laser device 200 being set up to stimulate the conversion segments 125 to emit light with a wavelength conversion .
  • incident laser beams from the laser device impinge on the conversion medium 100 having the phosphor 120 and excite the phosphor to photoluminescence.
  • light is emitted in a wavelength or wavelength range that is different from the light of the irradiating laser device 200 .
  • the light output of the conversion medium 100 or the conversion segments 125 essentially has Characteristics of a Lambertian radiator. In Fig. 1 exemplary light beams are drawn in for this purpose.
  • the material for the phosphor 120 can be selected from the group YAG: Gd, YAG-Ce, Y 2 O 3 -La 2 O 3 , MgAl 2 O 4 , Ca 2 Si 5 N 8 , Sr 2 Si 5 N 8 or Ba 2 Si 5 N 8 .
  • the depressions 130 are designed as a coherent structure, for example in a grid, and filled with a filler 300 , which in Fig. 3 can be seen more clearly.
  • a ceramic material for example, can be provided as the filler material.
  • the filler 300 in the depressions 130 prevents possible crosstalk of light beams onto adjacent conversion segments 125 , which likewise increases the contrast and at the same time increases the mechanical stability of the overall structure.
  • FIG. 14 shows an elevation of the exemplary conversion medium from FIG Figures 1a and 1b .
  • Fig. 3 a detailed view of a section through the conversion medium from the previous figures can be seen, with a reflective intermediate layer 500 being arranged between the carrier layer 110 and the luminescent material 120 .
  • an electrically conductive and optically reflective layer 400 is arranged in areas between the filler 300 and the depressions 130 or the walls of the depressions 130 .
  • “regionally” is to be understood as meaning that the electrically conductive layer 400 does not have to completely cover the depressions 130 or the walls of the depressions 130 , for example also in FIG Fig. 3 is shown.
  • Such an electrically conductive layer 400 in the depressions 130 can be used to check the functionality of the conversion medium 100 , with the electrically conductive layer 400 also being interrupted if the fluorescent material 120 or the conversion segments 125 break, which changes the electrical resistance, for example.
  • the electrically conductive layer 400 can be formed from metal, for example, preferably from Ag, Cu, Pt, Pd, Ni, Al or mixtures thereof.
  • Such an electrically conductive layer 400 in the depressions 130 can be used to check the functionality of the conversion medium 100 , with the electrically conductive layer 400 also being interrupted if the fluorescent material 120 or the conversion segments 125 break, which changes the electrical resistance, for example.
  • Fig. 4 For this purpose, an exemplary measuring arrangement comprising two measuring devices 600 is shown, which are set up to measure the resistance of the at least one electrically conductive layer 400 . By means of such a resistance measurement it can be determined whether a breakage of the phosphor 120 itself or of the conversion segments 125 has occurred.
  • a transversely induced voltage is measured instead of the resistance measurement.
  • a voltage is applied to two opposing electrodes, a transverse voltage being measured on two electrodes rotated by 90 ° to the previous electrodes and this transverse voltage being equal to zero with absolute symmetry. If this symmetry is disturbed, for example by a scratch or similar damage to the surface, a transverse stress other than zero is measured.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Led Device Packages (AREA)
  • Luminescent Compositions (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Claims (9)

  1. Module d'éclairage pour un projecteur de véhicule automobile, lequel module d'éclairage comprend un moyen de conversion (100) et un moyen d'éclairage (200), lequel moyen de conversion (100) présente un matériau fluorescent (120) disposé sur une couche de support (110), le matériau fluorescent (120) présentant une pluralité de segments de conversion (125) qui sont formés par des creux (130) dans le matériau fluorescent (120), dans lequel l'illuminant (200) est agencé pour exciter les segments de conversion (125) en une émission de lumière avec une conversion de longueur d'onde au moyen de faisceaux lumineux émis par l'illuminant (200), dans lequel les évidements (130) sont formés comme une structure cohérente et sont remplis avec un moyen de remplissage (300),
    caractérisé en ce que
    les dépressions (130) ont au moins une couche électriquement conductrice (400) au moins dans certaines zones, et le module de lumière comprend en outre au moins un dispositif de mesure (600) qui est agencé pour mesurer la résistance de la au moins une couche électriquement conductrice (400).
  2. Module de lumière selon la revendication 1, caractérisé en ce que les dépressions (130) ont au moins une couche optiquement réfléchissante (400) au moins dans certaines zones.
  3. Module d'éclairage selon la revendication 1 ou 2, caractérisé en ce qu'une couche intermédiaire (500) réfléchissant la lumière et/ou électriquement conductrice, par exemple en métal, est disposée entre le luminophore (120) et la couche de support (110).
  4. Module d'éclairage selon l'une des revendications 1 à 3, caractérisé en ce que le matériau pour le luminophore (120) est choisi dans le groupe YAG:Gd, YAG-Ce, Y2O3-La2O3, MgAl2O4, Ca2Si5N8, Sr2Si5N8 ou Ba2Si5N8.
  5. Module d'éclairage selon l'une des revendications 2 à 4, caractérisé en ce que la au moins une couche électriquement conductrice et/ou optiquement réfléchissante (400) est formée de métal, de préférence de Ag, Cu, Pt, Pd, Ni ou Al.
  6. Module d'éclairage selon l'une des revendications 1 à 5, caractérisé en ce que la source de lumière (200) est formée comme un dispositif laser, de préférence comme une diode laser.
  7. Module d'éclairage selon l'une des revendications 1 à 6, caractérisé en ce que la couche de support (110) est formée d'un matériau thermiquement conducteur, par exemple du saphir.
  8. Module d'éclairage selon l'une des revendications 1 à 7, caractérisé en ce que la charge (300) est formée d'un matériau céramique.
  9. Projecteur de véhicule automobile comportant au moins un module d'éclairage selon l'une des revendications 1 à 8.
EP18162863.7A 2018-03-20 2018-03-20 Module d'éclairage pour un phare de véhicule automobile Active EP3543596B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18162863.7A EP3543596B1 (fr) 2018-03-20 2018-03-20 Module d'éclairage pour un phare de véhicule automobile
KR1020190030501A KR102155540B1 (ko) 2018-03-20 2019-03-18 자동차 헤드램프용 광 모듈
CN201910212544.7A CN110307516B (zh) 2018-03-20 2019-03-20 用于机动车大灯的光模块

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18162863.7A EP3543596B1 (fr) 2018-03-20 2018-03-20 Module d'éclairage pour un phare de véhicule automobile

Publications (2)

Publication Number Publication Date
EP3543596A1 EP3543596A1 (fr) 2019-09-25
EP3543596B1 true EP3543596B1 (fr) 2020-08-26

Family

ID=61731600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18162863.7A Active EP3543596B1 (fr) 2018-03-20 2018-03-20 Module d'éclairage pour un phare de véhicule automobile

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EP (1) EP3543596B1 (fr)
KR (1) KR102155540B1 (fr)
CN (1) CN110307516B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4284892A1 (fr) 2021-01-26 2023-12-06 Signify Holding B.V. Luminophore laser pixelisé comprenant des carreaux luminophores céramiques entourés de particules luminophores dans un milieu

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
JP2010129615A (ja) * 2008-11-25 2010-06-10 Toshiba Lighting & Technology Corp 発光装置及び照明装置
JP5577138B2 (ja) * 2010-04-08 2014-08-20 スタンレー電気株式会社 車両用前照灯
JP2012109400A (ja) * 2010-11-17 2012-06-07 Sharp Corp 発光素子、発光装置および発光素子の製造方法
JP2013102078A (ja) * 2011-11-09 2013-05-23 Stanley Electric Co Ltd 光源装置および照明装置
JP6248743B2 (ja) * 2014-03-27 2017-12-20 ウシオ電機株式会社 蛍光光源装置
KR102361693B1 (ko) * 2014-09-17 2022-02-10 루미리즈 홀딩 비.브이. 조명 시스템
JP6697225B2 (ja) * 2015-05-25 2020-05-20 スタンレー電気株式会社 照明装置
US10174931B2 (en) * 2015-06-03 2019-01-08 Apple Inc. Integrated optical modules with enhanced reliability and integrity
US10174925B2 (en) * 2015-12-25 2019-01-08 Nichia Corporation Wavelength conversion member and light source device having wavelength conversion member

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
KR102155540B1 (ko) 2020-09-15
CN110307516A (zh) 2019-10-08
EP3543596A1 (fr) 2019-09-25
KR20190110451A (ko) 2019-09-30
CN110307516B (zh) 2022-01-18

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