EP2801752A1 - Fahrzeugsbeleuchtungsystem mit verschiedene Lichtfunktionen - Google Patents

Fahrzeugsbeleuchtungsystem mit verschiedene Lichtfunktionen Download PDF

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Publication number
EP2801752A1
EP2801752A1 EP14166962.2A EP14166962A EP2801752A1 EP 2801752 A1 EP2801752 A1 EP 2801752A1 EP 14166962 A EP14166962 A EP 14166962A EP 2801752 A1 EP2801752 A1 EP 2801752A1
Authority
EP
European Patent Office
Prior art keywords
light
radiation
phosphorescent
optical system
optical
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.)
Withdrawn
Application number
EP14166962.2A
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English (en)
French (fr)
Inventor
Pierre Albou
Jean-Claude Puente
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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 Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP2801752A1 publication Critical patent/EP2801752A1/de
Withdrawn legal-status Critical Current

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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
    • F21S41/14—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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/16—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
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the present invention relates to the technical field of lighting systems for a motor vehicle.
  • a lighting system for a motor vehicle is intended to perform a lighting function, for example a low beam function and a flashing function.
  • the low beam lights emit white light in the front of a vehicle to allow the lighting of the road mainly during the night.
  • the turn signals emit orange light in particular to indicate a change of direction of the vehicle.
  • phosphorescent material a material having a phosphorescent effect, generally comprising different chemical elements, but not necessarily containing phosphorus.
  • the light radiation passes through the wavelength conversion device which re-emits white light radiation.
  • This lighting system further comprises an optical imaging system receiving the white light re-emitted by the wavelength conversion device and projecting this re-emitted radiation to form a light beam.
  • the wavelength conversion device is located in the vicinity of a focal plane of the imaging optical system.
  • the effectiveness of this lighting system is limited by the radiation absorption phenomena by the transparent material substrate and parasitic reflections of the radiation passing through the diopters of the conversion device. In fact, a portion of the radiation is reflected back to the radiation source and approximately half of the white light is re-radiated to the back of the wavelength conversion device, i.e. the opposite of the optical imaging system.
  • the substrate of transparent material is generally polycarbonate or glass. These materials are known to be bad thermal conductors.
  • the power of the laser radiation tends to heat the phosphorescent material significantly without the possibility of dissipation of this heat in the glass or polycarbonate. As a result of this heating, the efficiency of conversion of the laser radiation into white light is reduced.
  • the low beam and flashing functions are generally performed by different lighting systems.
  • the object of the invention is to limit the number of different lighting systems on a motor vehicle and to minimize the dispersions of the laser radiation.
  • the lighting system according to the invention can perform the functions of dipped beam and flashing. Indeed, thanks to the control means of the scanning system, it is possible to select the scanning of a free surface of the first material, to perform the low beam function, or to select the scanning of a free surface of the second material, to perform the flashing function.
  • the lighting system according to the invention makes it possible to minimize the dispersions of the laser radiation. Indeed, because a mirror-equipped wavelength conversion device is used, the scanning system and the imaging optical system are placed on the same reflecting side of the mirror. that the radiation emitted by the light source no longer crosses the transparent substrate and above all, the light emitted by the device is sent back to the optical imaging system. The radiation losses are thus considerably reduced.
  • the lighting system according to the invention makes it possible to provide two beams respectively dedicated to the two flashing and dipped beam functions from two different apparent exit surfaces as required by certain regulations.
  • two phosphorescent materials are different when they re-emit lights of different wavelengths.
  • two different phosphorescent materials may be of different compositions or of the same composition but covered by films or film areas selecting or filtering lights of different wavelengths.
  • the invention also relates to a driving method of a lighting system for a motor vehicle, characterized in that the lighting system is controlled so that the scanning surface includes the free surface of a single phosphorescent material.
  • the subject of the invention is also a method for controlling a control system of a lighting system for a motor vehicle, characterized in that the lighting system is piloted so that the scanning surface includes the free surface of at least two materials.
  • the system 10 comprises a source 12 of light radiation comprising a primary type of primary light source 14, conventional optical focusing means 16 and means 17 for controlling a scanning system 18.
  • the light source 14 is a laser source comprising for example a laser diode, emitting for example a laser radiation L whose wavelength is between 400 nanometers and 500 nanometers, and preferably close to 450 or 460 nanometers. These wavelengths correspond to colors ranging from blue to near ultraviolet.
  • the primary light source 14 may alternatively comprise an optical device combining in a single beam several laser rays, for example using optical fibers or devices taking advantage of the different polarizations of different laser sources.
  • the scanning system 18, of conventional type comprises in the example described a single micro-mirror, mobile about two orthogonal axes, such as those used in optical scanning systems called "scanners".
  • the micro-mirror reflects the light radiation to a wavelength converting device 20 which has first and second layers 24 respectively of first 22 and second 24 different phosphorescent materials.
  • the two layers each cover a substrate 26 forming a mirror and are separated by a neutral zone 27 free of phosphorescent material.
  • the illumination system 10 further comprises a first imaging optical system 28 exclusively receiving a first light radiation reemitted by the first layer 22 of phosphorescent first material, and a second imaging optical system 30 receiving exclusively a second radiation of light reemitted by the second layer 24 of second phosphorescent material.
  • the first optical system 28 has a dipped beam function and the second optical system 30 has a flashing function.
  • the laser radiation L generated by the source 14 is deflected in two directions by the scanning system 18, and emerges in a solid angle intercepting a scanning surface 32 of the wavelength converting device 20.
  • the scanning system 18 and the optical imaging systems 28, 30 are arranged on the same reflecting side of the mirror 26 formed by the substrate 26.
  • the control means 17 of the scanning system 18 are adapted to form the scanning surface 32 by including a free surface of the first material 22 and / or a free surface of the second material 24 as a function of a selection parameter, for example , activation of a low beam function and / or a flashing function.
  • each point of the layer of the first material 22 of the wavelength conversion device 20 receiving the laser radiation L which is monochromatic and coherent, re-transmits, to the first imaging system 28, a light B of wavelength different from that of the laser L, and in particular a light that can be considered "white", that is to say that has a plurality of wavelengths between about 400 nanometers and 800 nanometers, c ' that is to say, included in the spectrum of visible light.
  • This emission of light occurs, according to a lambertian emission diagram, that is to say with a uniform luminance in all directions.
  • each point of the layer of the second material 24 of the wavelength conversion device 20 receiving the laser radiation L remits, to the second imaging system 30, an orange light O of different wavelength that of laser L, that is to say between about 590 nanometers and 620 nanometers.
  • the layers 22, 24 of phosphorescent materials being deposited on the substrate 26 reflecting for the laser radiation L it is ensured that the laser radiation L which would not have encountered a grain of phosphorescent material before having completely passed through the layers 22, 24 phosphorescent materials, may encounter a grain of phosphorescent material after being reflected by the substrate 26.
  • Substrate 26 is chosen from materials that are good thermal conductors, such as aluminum for example.
  • the substrate 26 thus makes it possible to limit the increase in temperature of the layers 22, 24 of phosphorescent material by promoting the dissipation of heat by the substrate 26.
  • the layers 22, 24 of phosphorescent materials are respectively located in the immediate vicinity of the focal planes of the optical imaging systems 28, 30, which then form at infinity, respectively, images of the layers 22, 24 of phosphorescent materials, or more exactly points of these layers that emit light in response to the laser excitation they receive.
  • the optical imaging systems 28, 30 form light beams FB, FO with the light emitted by the different points of the layers 22, 24 of phosphorescent materials illuminated by laser radiation L.
  • the light beams FB, FO emerging respectively from the optical imaging systems 28, 30 are substantially parallel to each other and to a reference axis, said beam axis F. They are generally projected towards the front of the vehicle, but the system of lighting described here could as well be arranged at the rear of the vehicle to project light beams backwards.
  • One of the beams could also be projected perpendicular to the other beam, so as to simultaneously perform an orange color function of lateral return (more commonly called "side marker" according to the English terminology) in a direction perpendicular to the longitudinal axis of the vehicle and another function in a direction parallel to the longitudinal axis of the vehicle.
  • the light beams FB, FO are directly a function of the light rays emitted by the first and second layers 22, 24 of phosphorescent materials, themselves directly function of the laser radiation L which scans these layers 22, 24.
  • the free surfaces of the layers of different phosphorescent materials are separated by the neutral zone 27 and are thus offset from each other by at least 1 mm, parallel to the axis of the beams F. The latter are also shifted together by at least 1 mm, orthogonal to the axis of the beams F.
  • Each imaging optical system 28, 30 includes a lens 34, 36 involved in the formation of the light beam.
  • Lenses 34, 36 of systems The first optical system 28 comprises a lens 34 participating in the formation of the beam FB emitted by this first optical system 28.
  • This lens 34 comes from a single element 38 common to the optical imaging systems 28, 30. is extended by a diopter 40 for shaping the FO beam emitted by the second optical system 30.
  • a control unit 42 controls the different components of the source 12 of light radiation according to the desired photometry of the light beams FB, FO.
  • the unit 42 drives the scanning system 18 so that the laser radiation L successively scans all the points of one or both layers 22, 24 of phosphorescent materials.
  • the unit 42 also controls the activation of the light source 14 and, where appropriate, the modulation of the intensity of the laser radiation L.
  • the lighting system 10 is adaptive and it comprises for this purpose conventional means for modulating the intensity of the illumination continuously, the intensity increasing or decreasing continuously between a minimum value and a maximum value. It is also possible to modulate the intensity of the lighting in a discrete manner, the intensity varying in jumps from one value to another, between a minimum value and a maximum value. In both cases, it can be expected that the minimum value zero corresponds to an absence of light.
  • Each point of the layers 22, 24 of phosphorescent material thus illuminated by the laser radiation L emits light B, O with an intensity which is directly a function of the intensity of the laser radiation L which illuminates this point, the emission taking place according to a Lambertian emission diagram.
  • the layers 22, 24 of phosphorescent materials can then be considered as secondary radiation sources, consisting of a light image, whose optical imaging systems 28, 30 form an image at infinity, for example on a screen placed remote in the axis of optical systems 28, 30 and perpendicular to this axis.
  • the image on such a screen is the materialization of the light beams FB, FO emitted respectively or together by the optical systems 28, 30.
  • the lighting system 10 comprises a partition wall 44 of the first and second light radiation B, O reemitted by the first and second layers 22, 24 of the first and second phosphorescent materials.
  • This partition wall 44 prevents the first radiation B from reaching the second imaging optical system 30 and prevents the second radiation O from reaching the first imaging optical system 28.
  • the wavelength conversion device comprises a third material covering the substrate, the first, second and third materials being distributed in at least three different zones of the wavelength conversion device.
  • the third material is different from the first two and re-emits red light.
  • the control means make it possible to form the scanning surface by including a free surface of the first material and / or a surface of the second material and / or a free surface of the third material according to a selection parameter.
  • Such a lighting system comprises a third imaging optical system exclusively receiving a third light radiation re-emitted by the third layer of the third phosphorescent material.
  • a lighting system as described in the above examples makes it possible to implement a control method of the lighting system so that the scanning surface includes the free surface of a single phosphorescent material or the free surface of the light source. at least two phosphorescent materials.
  • the lighting system may comprise means for varying the scanning speed of the layers of phosphorescent materials according to parameters such as the size or position of the scanning surface.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP14166962.2A 2013-05-07 2014-05-05 Fahrzeugsbeleuchtungsystem mit verschiedene Lichtfunktionen Withdrawn EP2801752A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1354207A FR3005493A1 (fr) 2013-05-07 2013-05-07 Systeme d'eclairage emettant des rayonnements de lumiere differents

Publications (1)

Publication Number Publication Date
EP2801752A1 true EP2801752A1 (de) 2014-11-12

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Family Applications (1)

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EP14166962.2A Withdrawn EP2801752A1 (de) 2013-05-07 2014-05-05 Fahrzeugsbeleuchtungsystem mit verschiedene Lichtfunktionen

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EP (1) EP2801752A1 (de)
FR (1) FR3005493A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3034058A1 (fr) * 2015-03-24 2016-09-30 Valeo Vision Module optique constitutif d'un dispositif d'eclairage et/ou de signalisation pour un vehicule automobile.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060120075A1 (en) * 2004-12-03 2006-06-08 Seiko Epson Corporation Light source unit and image display unit
EP2063170A2 (de) 2007-11-21 2009-05-27 Audi AG Beleuchtungsvorrichtung für ein Fahrzeug
JP2011142000A (ja) * 2010-01-07 2011-07-21 Stanley Electric Co Ltd 光源装置および照明装置
US20130058114A1 (en) * 2010-05-12 2013-03-07 Osram Gesellschaft Mit Beschrankter Haftung Headlight Module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060120075A1 (en) * 2004-12-03 2006-06-08 Seiko Epson Corporation Light source unit and image display unit
EP2063170A2 (de) 2007-11-21 2009-05-27 Audi AG Beleuchtungsvorrichtung für ein Fahrzeug
JP2011142000A (ja) * 2010-01-07 2011-07-21 Stanley Electric Co Ltd 光源装置および照明装置
US20130058114A1 (en) * 2010-05-12 2013-03-07 Osram Gesellschaft Mit Beschrankter Haftung Headlight Module

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3034058A1 (fr) * 2015-03-24 2016-09-30 Valeo Vision Module optique constitutif d'un dispositif d'eclairage et/ou de signalisation pour un vehicule automobile.

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Publication number Publication date
FR3005493A1 (fr) 2014-11-14

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