EP3135988A1 - Dispositif d'éclairage de véhicule - Google Patents

Dispositif d'éclairage de véhicule Download PDF

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Publication number
EP3135988A1
EP3135988A1 EP16001457.7A EP16001457A EP3135988A1 EP 3135988 A1 EP3135988 A1 EP 3135988A1 EP 16001457 A EP16001457 A EP 16001457A EP 3135988 A1 EP3135988 A1 EP 3135988A1
Authority
EP
European Patent Office
Prior art keywords
light
wavelength
laser diode
conversion
conversion element
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
Application number
EP16001457.7A
Other languages
German (de)
English (en)
Other versions
EP3135988B1 (fr
Inventor
Nathan Brüchner
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.)
MAN Truck and Bus SE
Original Assignee
MAN Truck and Bus SE
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Filing date
Publication date
Application filed by MAN Truck and Bus SE filed Critical MAN Truck and Bus SE
Publication of EP3135988A1 publication Critical patent/EP3135988A1/fr
Application granted granted Critical
Publication of EP3135988B1 publication Critical patent/EP3135988B1/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
    • F21S41/10—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
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • 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
    • 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
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • 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 present invention relates to a lighting device for a vehicle comprising a laser diode array comprising a plurality of substantially monochromatic laser diodes; an optical device; and a wavelength conversion light wavelength conversion element, wherein the optical device is configured to direct the light generated by the laser diode array onto the light wavelength conversion element, and wherein the light wavelength conversion element is formed, the laser diode array light directed to the light wavelength conversion element via the optical device at least partially into light of other wavelength to convert.
  • the DE 10 2010 034 054 A1 discloses a laser-based white light source which proportionally emits light from a first wavelength range, in particular in the blue and / or ultraviolet spectral range, and converts the light by means of a conversion medium into a second wavelength range, in particular into a yellowish range, and from the mixture of the two spectral colors as produces white perceived light.
  • the converted yellow portion of the generated light has a wider polychromatic spectrum due to the characteristic of the conversion element; while the bluish portion of the light, the unconverted portion, has a quasi-monochromatic spectrum.
  • This device has two disadvantages.
  • the proportionate conversion of light from a bluish to a yellowish region the so-called Stokes shift
  • the second major disadvantage is the inhomogeneous spectral distribution, which is obtained by the mixture of converted, polychromatic light in the yellowish region and unconverted, quasi-monochromatic light. This leads to falsified color perceptions which can be detrimental to the driver on the road.
  • a lighting device for a vehicle comprising a laser diode array comprising a plurality of laser diodes, an optical device, and a wavelength conversion light wavelength conversion element.
  • the optical device is in this case designed to direct the light generated by the laser diode arrangement on the light wavelength conversion element.
  • the light wavelength conversion element is designed to at least partially convert the light of the laser diode arrangement directed to the light wavelength conversion element via the optical device into light of other wavelengths.
  • the illumination device is characterized in that the laser diode arrangement is designed to generate laser radiation of at least two different wavelengths ( ⁇ 1, ⁇ 2).
  • the laser diode array has at least two types of quasi-monochromatic laser diodes, which differ in that they emit quasi-monochromatic laser light of different wavelengths, so that laser light of at least two different wavelengths simultaneously impinges on the light wavelength conversion element during operation of the illumination device.
  • the essential advantage of the invention lies in the fact that due to the use of at least two different wavelengths as the input variable, a significantly more energy-efficient conversion into an overall spectrum can take place.
  • the light wavelength conversion element may be configured to convert the irradiated light of the laser diode array into a predetermined wavelength range and / or into a desired non-coherent polychromatic light spectrum.
  • the lighting device may be configured to produce a light perceived as white.
  • Light wavelength conversion elements are known per se from the prior art.
  • these light wavelength conversion elements for. B. in the form of so-called.
  • Conversion layers or a conversion medium the incident light is converted into radiation of greater wavelength.
  • laser light is absorbed, in particular coherent laser light having a strongly limited wavelength spectrum. Due to the energy input from the laser light, electrons in the converter material are excited by the laser light into higher energy levels. When the electrons fall back to their original energy level, the converter material emits light of the wavelength corresponding to the energy level.
  • the light emitted by the light wavelength conversion element is not monochromatic, but undergoes a spectral broadening into a polychromatic light spectrum during the conversion process.
  • suitable phosphorus converters can be used as the converter material of the light wavelength conversion element, which respond to different wavelengths, in particular to different colored radiation.
  • Phoshortech Phoshor Corporation 3645 Kennesaw North Industrial Parkway, Kennesaw, Ga 30144, USA, with the product name HTR650 is sold.
  • Other converter materials For example, yttrium aluminum garnet (YAG) or alkaline earth ortho silicate (BO-SE).
  • the light wavelength conversion element can be configured to at least partially convert the irradiated light of a first wavelength ⁇ 1 of the laser diode array into a first predetermined conversion wavelength range and at least partially distribute the irradiated light of a second wavelength ⁇ 2 of the laser diode array into a second predetermined conversion wavelength range for ⁇ 1 ⁇ 2, the first conversion wavelength range is shifted toward smaller wavelengths as compared with the second conversion wavelength range.
  • the first conversion wavelength range lies on a wavelength axis in the direction of increasing wavelength to the left of the second conversion wavelength range.
  • the converter material thus responds both to the first wavelength ⁇ 1 and to the wavelength ⁇ 2, for example, two corresponding conversion layers may be provided in the light wavelength conversion element.
  • the laser diode array can be designed to generate laser radiation of three different wavelengths ( ⁇ 1, ⁇ 2, ⁇ 3).
  • the laser diode arrangement is designed to generate laser beams with emission wavelengths in the primary colors red ( ⁇ 1), green ( ⁇ 2) and blue ( ⁇ 3).
  • the converter material thus responds both to the first wavelength ⁇ 1, the second wavelength ⁇ 2 and to the third wavelength ⁇ 3, for example, three corresponding conversion layers may be provided in the light wavelength conversion element.
  • the light wavelength conversion element is designed to expand laser beams of a primary color, that is to say a quasi-monochrome spectral range, in each case into a wider spectral range.
  • the expansion according to the invention always refers to an increase in wavelength. For example, laser beams with emission wavelengths ⁇ 1 in the Basic color red at least partially converted into light from a first conversion wavelength range.
  • Laser beams with emission wavelengths ⁇ 2 in the primary color green can at least partially be converted into light from a second conversion wavelength range
  • laser beams with emission wavelengths ⁇ 3 in the primary color blue can be at least partially converted into light from a third conversion wavelength range
  • the first conversion wavelength Wavelength range is shifted towards larger wavelengths compared to the second conversion wavelength range
  • the second conversion wavelength range is also shifted toward larger wavelengths compared to the third conversion wavelength range.
  • the first conversion wavelength region is positioned on a wavelength axis in the direction of increasing wavelength to the right of the second conversion wavelength region and positioned to the right of the third conversion wavelength region.
  • the laser diode arrangement can be designed to generate the laser radiation in each of the three wavelengths, in particular red, green and blue, in three different polarization directions.
  • the light wavelength conversion element is designed to at least partially convert the light of the laser diode arrangement directed onto the light wavelength conversion element into light of a different wavelength as a function of the wavelength of the light and depending on the polarization direction.
  • the laser diode array may be configured to generate the laser radiation in each of the three wavelengths in only one or two different polarization directions.
  • the optical device should be understood to mean all optical devices or arrangements which are designed to direct the light generated by the laser diode arrangement onto the light wavelength conversion element.
  • the optical device is a combining element, which is designed to merge the light generated by the laser diode array into a beam path.
  • the combining element may be a dichroic element, in particular a dichroic cube or a dichroic mirror.
  • a mirror is understood to be a beam combiner, by means of which a plurality of laser light beams having different wavelengths are combined into a common beam path.
  • FIG. 1 is a schematic schematic diagram of a lighting device 1 shown, as it can be used in particular in a (not shown) vehicle headlight.
  • the diode arrangement 7 has three laser diodes 2, 3 and 4.
  • the first laser diode 2 generates laser light having a first wavelength ⁇ 1, the second laser diode 3 laser light having a second wavelength ⁇ 2 and the third laser diode 4 laser light having a third wavelength ⁇ 3.
  • the emission wavelength ⁇ 1 corresponds to red laser light, the emission wavelength ⁇ 2 to green laser light and the emission wavelength ⁇ 3 to blue laser light.
  • the light beam of the laser diode 1 with the wavelength ⁇ 1 is also identified by the reference symbol ⁇ 1. Accordingly, the light beam of the laser diode 2 is denoted by the reference character ⁇ 2 and the light beam of the laser diode 3 by the reference symbol ⁇ 3.
  • the light beams ⁇ 1, ⁇ 2 and ⁇ 3 emitted by the laser diode array 7 strike a combining element 5, which is designed as a dichroic cube and brings together the three beam paths of the light beams ⁇ 1, ⁇ 2 and ⁇ 3 into a beam path 8, which is directed to a light wavelength conversion element 6.
  • the light wavelength conversion element 6 is a phosphorus-based converter which responds to several colors.
  • the element 6 contains a converter material which responds to both the first wavelength ⁇ 1, the second wavelength ⁇ 2 and the third wavelength ⁇ 3, ie converts light of these wavelengths at least partially into light of a larger wavelength, so that the three quasi-monochromatic Light rays of the laser diodes 2, 3 and 4, the merged light beam 8 on the Meet light wavelength conversion element 6, be converted into a polychromatic light cone 9.
  • the converter material, ie the phosphor of the light wavelength conversion element 6, can for example be based on yttrium-aluminum-garnet (YAG) or alkaline-earth-ortho-silicate (BOSE).
  • FIG. 2 schematically illustrates how from the emitted laser beams of the laser diode array 7 by the light wavelength conversion element 6, a polychromatic light wave spectrum 9 is formed.
  • FIG. 2 shows a schematic representation of the wavelength distribution of the laser light after exiting the wavelength conversion element. 6
  • the incident radiation is usually only proportionately converted, so that a proportion unconverted, d. H. without wavelength conversion, is transmitted.
  • the peak 30 denotes the proportion of the transmitted radiation of the wavelength ⁇ 1, the peak 20 corresponding to the proportion of the transmitted radiation of the wavelength ⁇ 2 and the peak 30 corresponding to the proportion of the transmitted radiation ⁇ 3.
  • the light wavelength conversion element 6 is responsive to all three wavelengths ⁇ 1, ⁇ 2 and ⁇ 3, a portion of the incident light rays are converted respectively.
  • the converter material of the wavelength conversion element 6 converts incident light of wavelength ⁇ 1 in the primary color red at least proportionally into light from a first conversion wavelength range 10 ', light of wavelength ⁇ 2 in the primary color green at least proportionally into light from a second conversion wavelength range 20' and Light of wavelength ⁇ 3 in the primary color blue at least partially in light from a third conversion wavelength range 30 '.
  • the first conversion wavelength range 10 ' is shifted toward larger wavelengths as compared to the second conversion wavelength range 20'
  • the second conversion wavelength range 20 ' is again shifted towards longer wavelengths as compared to the third conversion wavelength range 30'.
  • the polychromatic light spectrum 9 thus generated by the illumination device 1 results from the superimposition, in FIG. 2 represented by the "plus” characters, the unconverted portions 14 and the converted spectrally expanded portions 13, so that a spectrum of light 9 perceived as white is produced in the mixture.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Semiconductor Lasers (AREA)
EP16001457.7A 2015-08-26 2016-06-29 Dispositif d'éclairage de véhicule Active EP3135988B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015011126.4A DE102015011126A1 (de) 2015-08-26 2015-08-26 Beleuchtungsvorrichtung für ein Fahrzeug

Publications (2)

Publication Number Publication Date
EP3135988A1 true EP3135988A1 (fr) 2017-03-01
EP3135988B1 EP3135988B1 (fr) 2019-03-13

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Family Applications (1)

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EP16001457.7A Active EP3135988B1 (fr) 2015-08-26 2016-06-29 Dispositif d'éclairage de véhicule

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EP (1) EP3135988B1 (fr)
DE (1) DE102015011126A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11402080B2 (en) * 2019-05-23 2022-08-02 Korrus, Inc. Dynamic illumination using a coherent light source

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010034054A1 (de) 2010-08-11 2012-02-16 Schott Ag Laserbasierte Weißlichtquelle
DE102012002232A1 (de) 2012-02-04 2012-09-20 Daimler Ag Beleuchtungsvorrichtung für ein Fahrzeug
WO2013051623A1 (fr) * 2011-10-03 2013-04-11 シャープ株式会社 Corps émetteur de lumière, dispositif d'éclairage et phare
US20140321151A1 (en) * 2011-11-18 2014-10-30 Sharp Kabushiki Kaisha Illumination apparatus, vehicle headlamp, and downlight
WO2014203479A1 (fr) * 2013-06-21 2014-12-24 パナソニックＩｐマネジメント株式会社 Source de lumière, et phare de véhicule équipé de la source de lumière
EP2829790A2 (fr) * 2013-07-23 2015-01-28 Valeo Vision Système d'éclairage associant une lumière blanche et une lumière d'une autre couleur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010034054A1 (de) 2010-08-11 2012-02-16 Schott Ag Laserbasierte Weißlichtquelle
WO2013051623A1 (fr) * 2011-10-03 2013-04-11 シャープ株式会社 Corps émetteur de lumière, dispositif d'éclairage et phare
US20140321151A1 (en) * 2011-11-18 2014-10-30 Sharp Kabushiki Kaisha Illumination apparatus, vehicle headlamp, and downlight
DE102012002232A1 (de) 2012-02-04 2012-09-20 Daimler Ag Beleuchtungsvorrichtung für ein Fahrzeug
WO2014203479A1 (fr) * 2013-06-21 2014-12-24 パナソニックＩｐマネジメント株式会社 Source de lumière, et phare de véhicule équipé de la source de lumière
EP2829790A2 (fr) * 2013-07-23 2015-01-28 Valeo Vision Système d'éclairage associant une lumière blanche et une lumière d'une autre couleur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11402080B2 (en) * 2019-05-23 2022-08-02 Korrus, Inc. Dynamic illumination using a coherent light source

Also Published As

Publication number Publication date
DE102015011126A1 (de) 2017-03-02
EP3135988B1 (fr) 2019-03-13

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