WO2021004805A1 - Lighting device for a motor vehicle - Google Patents

Lighting device for a motor vehicle Download PDF

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Publication number
WO2021004805A1
WO2021004805A1 PCT/EP2020/067880 EP2020067880W WO2021004805A1 WO 2021004805 A1 WO2021004805 A1 WO 2021004805A1 EP 2020067880 W EP2020067880 W EP 2020067880W WO 2021004805 A1 WO2021004805 A1 WO 2021004805A1
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WO
WIPO (PCT)
Prior art keywords
light
lighting device
coupling
light guide
optical
Prior art date
Application number
PCT/EP2020/067880
Other languages
German (de)
French (fr)
Inventor
Bernd Fischer
Carsten Hohmann
Werner Kösters
Martin Mügge
Thomas Rettweiler
Christian Smarslik
Benjamin Willeke
Original Assignee
HELLA GmbH & Co. KGaA
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 HELLA GmbH & Co. KGaA filed Critical HELLA GmbH & Co. KGaA
Publication of WO2021004805A1 publication Critical patent/WO2021004805A1/en

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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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • 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
    • F21S41/32—Optical layout thereof
    • 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
    • F21S43/14—Light emitting diodes [LED]
    • 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
    • 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
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/237—Light guides characterised by the shape of the light guide rod-shaped
    • 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
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • 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
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • 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
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors

Definitions

  • the present invention relates to a lighting device for a motor vehicle, in particular a headlight for a motor vehicle, according to the preamble of claim 1.
  • a lighting device of the aforementioned type is known from DE 10 2011 085 385 A1.
  • the lighting device described therein can be used as a headlight of a vehicle and comprises a light source configured as a laser diode, the light of which is coupled into a light guide when the lighting device is in operation.
  • the light guide has a coupling-out surface which extends in the longitudinal direction of the light guide and which in particular has a roughened surface or a plurality of prisms, so that light emerges from the coupling-out surface.
  • Optical means are also provided in the form of a mirror or a lens through which the light that has passed from the coupling-out surface passes or from which the light that has passed through the coupling-out surface is reflected.
  • Lighting devices for the low beam and high beam of a motor vehicle can be implemented with different optical systems, for example with Re reflectors or with lens optics.
  • the relatively large reflectors with halogen lamps have been miniaturized ever since the introduction of LED technology, with other optical components also being made ever smaller.
  • the general design trend towards flat headlights also plays a role.
  • the miniaturization of optical components is often associated with the fact that not only a light-emitting diode (LED) is used in a narrow reflector or behind a lens system, but often a light-emitting diode assembly consisting of three or four or five light-emitting diodes positioned next to one another. This is done to create an elongated luminous surface for a reflector or a lens and to generate a wide light distribution for a glare light in a simple manner.
  • the luminous areas of the LEDs positioned next to one another do not form a coherent luminous area, which is desirable for some optical systems.
  • light-emitting diodes are used, which radiate cosine-shaped light into the entire half-space, which is often only partially used by the optical components.
  • the problem underlying the present invention is to create a lighting device of the type mentioned, which can effectively generate a wide Lichtver distribution.
  • the light guide comprises a plurality of decoupling surfaces that are spaced from one another. In this way, the portions of the light emerging from the individual decoupling surfaces can strike the optical means in a targeted manner.
  • the lighting device comprises a plurality of optical means through which the light emerging from the plurality of coupling-out surfaces during operation of the lighting device passes, with optical means in particular being assigned to each of the coupling-out surfaces.
  • the optical means can in particular be designed as a mirror or comprise at least one mirror.
  • the optical means can be designed as a lens or comprise at least one lens.
  • the size of at least one of the coupling-out surfaces is adapted to the size of the optical means.
  • the light guide can comprise deflection means which in each case partially deflect the light propagating in the light guide in the direction of the outcoupling surfaces, with deflection means being assigned in particular to each outcoupling surface.
  • the deflection means can be designed in such a way that the light deflected by the deflection means essentially only hits the coupling-out surfaces and exits the light guide through them.
  • the light can therefore preferably be emitted by the deflection means in a directed and concentrated manner in a desired direction and with a defined light distribution or a defined divergence angle. Due to the concentrated, narrow light distribution and the correspondingly high light intensities and luminance levels with a simultaneously small light exit, the lighting device can be used effectively as low beam and high beam systems.
  • the coupling surfaces of the light guide which serve as partial light emission areas, can correspond to the following optical means and effectively supply them with light.
  • the deflection means are designed as nanoscale optical surfaces that were generated in the light guide in particular by laser irradiation.
  • the optical surfaces can be realized by partial refractive index variations in the mate rial of the light guide or also by scattering centers that are produced by partial melting of the light guide material.
  • several of the optical surfaces can be combined in an arrangement corresponding to a diffraction grating in order in this way to enable deflection in a predetermined direction.
  • the lighting device comprises converter means which convert the light from the light source with regard to its wavelength spectrum, in particular wherein the converter means convert the light from the light source into white light.
  • the converter means can be arranged in the region of the decoupling surfaces, in particular with converter means being assigned to each decoupling surface.
  • Each decoupling surface can preferably have converter means or be coated with converter means through which the light emerging from the coupling surface passes. In this way it can be ensured that the white light is only generated on the decoupling surfaces, which in turn are appropriately assigned to the optical means, in particular the mirrors or lenses.
  • the at least one light source is formed as a laser diode.
  • a laser diode can be used which generates blue light which can be converted into white light by the converter means.
  • the at least one light source can also be designed as a light-emitting diode, in particular as a blue light-emitting diode to enable a corresponding conversion into white light.
  • the at least one light source is arranged in the headlight away from the optical means, for example at one point in the
  • Headlights with ideal thermal conditions for operating the at least one light source and for integrating protective mechanisms Since the light emanating from the at least one light source is transported by means of the light guide to the optics and the light guide only lights up at the coupling-out surfaces, there are no losses in the light feed and the non-light-emitting light guide areas.
  • Fig. 1 is a perspective detailed view of a first embodiment of a device according to the invention designed as a headlight lighting device;
  • FIG. 2 is a perspective detailed view of a second embodiment of a lighting device according to the invention designed as a headlight;
  • FIG. 3 shows a detail of a top view of a third embodiment of a lighting device according to the invention designed as a headlight. Identical or functionally identical parts are provided with the same reference symbols in the figures.
  • the embodiments of a lighting device according to the invention shown in the figures comprise at least one light source 1, indicated schematically in FIG. 2, which is in particular designed as a laser diode.
  • the laser diode preferably emits blue light 2, for example with a wavelength of 450 nm or 405 nm.
  • the lighting device further comprises a light guide 3 into which the light 2 emanating from the at least one light source is coupled at one of the end faces 4 of the light guide 3.
  • the light guide 3 can in particular be thin and flexible.
  • the light guide 3 can have a diameter between 0.1 mm and 0.3 mm, for example a diameter of approximately 0.2 mm.
  • the light guide 3 has a plurality of deflection means (not shown) which are spaced apart from one another in the longitudinal direction of the light guide 3 and by which parts of the light 2 are deflected in the radial direction.
  • the deflection means can in particular be designed as optical surfaces, several of which are combined in an arrangement corresponding to a diffraction grating.
  • the nanoscale optical surfaces can in particular be arranged at an angle of, for example, 45 ° to the longitudinal direction of the light guide 3, so that a reflection of the parts of the light 2 takes place predominantly in exactly one radial direction.
  • the light guide 3 furthermore has several coupling-out surfaces 5 spaced apart in the longitudinal direction of the light guide 3 in the jacket region of the light guide 3, through which light 2 can exit the light guide 3 in the radial direction.
  • Deflection means are assigned to each of the decoupling surfaces 5, so that the portion 6 of the light 2 deflected in the radial direction by the deflection means strikes one of the decoupling surfaces 5 and at least partially exits it.
  • the training coupling surfaces 5 each arranged exactly where the deflected portion 6 of the light 2 strikes the outer surface of the light guide 3 (see FIG. 2).
  • converter means are arranged, in particular as a light-converting layer on each of the decoupling surfaces 5, through which the portion 6 of the light 2 can at least partially pass.
  • the light-converting layer can, for example, convert part of the blue light 2 into yellow light and scatter the blue light so that, in total, a white color impression is achieved.
  • Other types of converter means can also be used. It is advantageous if the converter means are arranged only in the region of the coupling-out surfaces 5.
  • the embodiments of a lighting device according to the invention depicted in FIGS. 1 and 2 furthermore comprise a plurality of mirrors 7 which reflect the portion 6 of the light 2 that has emerged from the coupling-out surfaces 5.
  • a mirror 7 is assigned to each of the coupling-out surfaces 5, so that the portion 6 of the light 2 that has emerged from the corresponding coupling-out surface 5 is only reflected precisely by the associated mirror 7.
  • the light guide 3 is guided along a row of mirrors 7, for each of which an elongated and at the same time narrow luminous surface is generated by the coupling-out surfaces 5 with converter means.
  • the luminous surface is realized in sections on the light guide 3 by the converter means, which provide a narrow luminous surface in any desired length for each mirror 7.
  • the portion 6 of the light 2 emerging from the decoupling surfaces 5 is then emitted in a directed manner onto the mirror 7. Scattered light, as is the case with light-emitting diodes radiating more widely, is largely avoided.
  • the light guide 3 has no decoupling surfaces 5 with converter means and therefore does not emit any light. In this way, a light guide 3 with alternately light-emitting Realizing radiating light areas and non-light emitting areas arranged in between.
  • Fig. 1 shows that this principle can easily be implemented even with an offset mirror arrangement and a distance between the mirrors 7, because the light guide 3 is bent for the subsections and guided and fixed along the mirror gradation who can.
  • the embodiment of a lighting device according to the invention shown in FIG. 3 comprises, instead of the mirrors 7, a plurality of lenses 8, through which the portions 6 of the light 2 that have emerged from the coupling-out surfaces 5 pass.
  • a lens 8 is assigned to each of the coupling-out surfaces 5, so that the portion 6 of the light 2 that has emerged from the corresponding coupling-out surface 5 only passes precisely through the assigned lens 8.
  • the light guide 3 is also bent with an offset lens arrangement and with a corresponding distance between the lenses 8 and guided and fixed along the Linsenstu fungus.

Abstract

A lighting device for a motor vehicle, in particular a headlamp for a motor vehicle, comprises at least one light source (1), from which light (2) emanates during the operation of the lighting device, a light guide (3), into which the light (2) emanating from the at least one light source (1) is coupled during the operation of the lighting device, at least one output coupling area (5), from which the light (2) emerges from the light guide (3) during the operation of the lighting device, and optical means, through which the light (2) that emerged from the output coupling area (5) passes during the operation of the lighting device or from which the light (2) that emerged from the output coupling area (5) is reflected during the operation of the lighting device, wherein the light guide (3) comprises a plurality of output coupling areas (5) that are spaced apart from one another.

Description

Beleuchtungsvorrichtung für ein Kraftfahrzeug Lighting device for a motor vehicle
Beschreibung description
Die vorliegende Erfindung betrifft eine Beleuchtungsvorrichtung für ein Kraftfahrzeug, insbesondere einen Scheinwerfer für ein Kraftfahrzeug, gemäß dem Oberbegriff des Anspruchs 1. The present invention relates to a lighting device for a motor vehicle, in particular a headlight for a motor vehicle, according to the preamble of claim 1.
Eine Beleuchtungsvorrichtung der vorgenannten Art ist aus der DE 10 2011 085 385 A1 bekannt. Die darin beschriebene Beleuchtungsvorrichtung kann als Scheinwerfer eines Fahrzeugs verwendet werden und umfasst eine als Laserdiode ausgebildete Lichtquelle, deren Licht im Betrieb der Beleuchtungsvorrichtung in einen Lichtleiter eingekoppelt wird. Der Lichtleiter weist eine sich in Längsrichtung des Lichtleiters er streckende Auskoppelfläche auf, die insbesondere eine aufgeraute Oberfläche oder eine Vielzahl von Prismen aufweist, so dass Licht aus der Auskoppelfläche austritt. Es sind weiterhin Optikmittel in Form eines Spiegels oder einer Linse vorgesehen, durch die das aus der Auskoppelfläche hindurchgetretene Licht hindurchtritt oder von denen das aus der Auskoppelfläche hindurchgetretene Licht reflektiert wird. A lighting device of the aforementioned type is known from DE 10 2011 085 385 A1. The lighting device described therein can be used as a headlight of a vehicle and comprises a light source configured as a laser diode, the light of which is coupled into a light guide when the lighting device is in operation. The light guide has a coupling-out surface which extends in the longitudinal direction of the light guide and which in particular has a roughened surface or a plurality of prisms, so that light emerges from the coupling-out surface. Optical means are also provided in the form of a mirror or a lens through which the light that has passed from the coupling-out surface passes or from which the light that has passed through the coupling-out surface is reflected.
Beleuchtungsvorrichtungen für das Abblendlicht und Fernlicht eines Kraftfahrzeugs können mit unterschiedlichen Optiksystemen realisiert werden, beispielsweise mit Re flektoren oder mit Linsenoptiken. Die relativ großen Reflektoren mit Halogenlampen werden seit Einführung der LED-Technik immer weiter miniaturisiert, wobei auch an dere optische Komponenten immer kleiner ausgeführt werden. Neben den Möglichkei ten der LED-Technik zur Reduzierung der Größe spielt hierbei auch der allgemeine Designtrend zu flachen Scheinwerfern eine Rolle. Lighting devices for the low beam and high beam of a motor vehicle can be implemented with different optical systems, for example with Re reflectors or with lens optics. The relatively large reflectors with halogen lamps have been miniaturized ever since the introduction of LED technology, with other optical components also being made ever smaller. In addition to the possibilities offered by LED technology to reduce the size, the general design trend towards flat headlights also plays a role.
Die Miniaturisierung der optischen Komponenten ist häufig damit verbunden, dass in einem schmalen Reflektor oder hinter einer Linsenoptik nicht nur eine Leuchtdiode (LED) genutzt wird, sondern oft eine Leuchtdioden-Baugruppe aus drei oder vier oder fünf nebeneinander positionierten Leuchtdioden. Dies geschieht um eine langgestreckte Leuchtfläche für einen Reflektor oder eine Lin se zu schaffen und auf einfache Art und Weise eine breite Lichtverteilung für ein Ab blendlicht zu generieren. Die Leuchtflächen der nebeneinander positionierten Leucht dioden bilden keine zusammenhängende Leuchtfläche, was für einige optische Sys teme wünschenswert ist. In der Regel kommen Leuchtdioden zum Einsatz, die cosi nusförmig in den gesamten Halbraum Licht abstrahlen, das von den optischen Kom ponenten oftmals nur zum Teil genutzt wird. The miniaturization of optical components is often associated with the fact that not only a light-emitting diode (LED) is used in a narrow reflector or behind a lens system, but often a light-emitting diode assembly consisting of three or four or five light-emitting diodes positioned next to one another. This is done to create an elongated luminous surface for a reflector or a lens and to generate a wide light distribution for a glare light in a simple manner. The luminous areas of the LEDs positioned next to one another do not form a coherent luminous area, which is desirable for some optical systems. As a rule, light-emitting diodes are used, which radiate cosine-shaped light into the entire half-space, which is often only partially used by the optical components.
Das der vorliegenden Erfindung zugrundeliegende Problem ist die Schaffung einer Beleuchtungsvorrichtung der eingangs genannten Art, die effektiv eine breite Lichtver teilung generieren kann. The problem underlying the present invention is to create a lighting device of the type mentioned, which can effectively generate a wide Lichtver distribution.
Dies wird erfindungsgemäß durch eine Beleuchtungsvorrichtung der eingangs ge nannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1 erreicht. Die Un- teransprüche betreffen bevorzugte Ausgestaltungen der Erfindung. According to the invention, this is achieved by a lighting device of the type mentioned at the outset with the characterizing features of claim 1. The subclaims relate to preferred embodiments of the invention.
Gemäß Anspruch 1 ist vorgesehen, dass der Lichtleiter mehrere Auskoppelflächen umfasst, die voneinander beabstandet sind. Auf diese Weise können die aus den ein zelnen Auskoppelflächen austretenden Anteile des Lichts gezielt auf die Optikmittel auftreffen. According to claim 1 it is provided that the light guide comprises a plurality of decoupling surfaces that are spaced from one another. In this way, the portions of the light emerging from the individual decoupling surfaces can strike the optical means in a targeted manner.
Dabei kann vorgesehen sein, dass die Beleuchtungsvorrichtung mehrere Optikmittel umfasst, durch die das aus den mehreren Auskoppelflächen im Betrieb der Beleuch tungsvorrichtung austretende Licht hindurchtritt, wobei insbesondere jeder der Aus koppelflächen Optikmittel zugeordnet sind. Die Optikmittel können insbesondere als Spiegel ausgebildet sein oder mindestens einen Spiegel umfassen. Alternativ können die Optikmittel als Linse ausgebildet sein oder mindestens eine Linse umfassen. It can be provided that the lighting device comprises a plurality of optical means through which the light emerging from the plurality of coupling-out surfaces during operation of the lighting device passes, with optical means in particular being assigned to each of the coupling-out surfaces. The optical means can in particular be designed as a mirror or comprise at least one mirror. Alternatively, the optical means can be designed as a lens or comprise at least one lens.
Es besteht die Möglichkeit, dass die Größe mindestens einer der Auskoppelflächen an die Größe der Optikmittel angepasst ist. Auf diese Weise kann eine optimale Lichtnut zung durch die Kombination des Lichtleiters mit den Optikmitteln ermöglicht werden. Es kann vorgesehen sein, dass der Lichtleiter Ablenkmittel umfasst, die das sich in dem Lichtleiter ausbreitende Licht jeweils teilweise in Richtung auf die Auskoppelflä chen ablenken, wobei insbesondere jeder Auskoppelfläche Ablenkmittel zugeordnet sind. Insbesondere können die Ablenkmittel dabei so ausgebildet sein, dass das von den Ablenkmitteln abgelenkte Licht im Wesentlichen ausschließlich auf die Auskoppel flächen trifft und durch diese aus dem Lichtleiter austritt. Vorzugsweise kann das Licht durch die Ablenkmittel also gerichtet und konzentriert in eine gewünschte Richtung sowie mit einer definierten Lichtverteilung beziehungsweise einem definierten Diver genzwinkel abgestrahlt werden. Durch die konzentrierte, enge Lichtverteilung und die entsprechend hohen Lichtstärken und Leuchtdichten bei gleichzeitig kleinem Lichtaus tritt lässt sich die Beleuchtungsvorrichtung effektiv als Abblendlicht- und Fernlichtsys temen nutzen. Dabei können die als partielle Lichtabstrahlbereiche dienenden Aus koppelflächen des Lichtleiters mit den nachfolgenden Optikmitteln korrespondieren und diese effektiv mit Licht versorgen. There is the possibility that the size of at least one of the coupling-out surfaces is adapted to the size of the optical means. In this way, an optimal use of light can be made possible by the combination of the light guide with the optical means. Provision can be made for the light guide to comprise deflection means which in each case partially deflect the light propagating in the light guide in the direction of the outcoupling surfaces, with deflection means being assigned in particular to each outcoupling surface. In particular, the deflection means can be designed in such a way that the light deflected by the deflection means essentially only hits the coupling-out surfaces and exits the light guide through them. The light can therefore preferably be emitted by the deflection means in a directed and concentrated manner in a desired direction and with a defined light distribution or a defined divergence angle. Due to the concentrated, narrow light distribution and the correspondingly high light intensities and luminance levels with a simultaneously small light exit, the lighting device can be used effectively as low beam and high beam systems. The coupling surfaces of the light guide, which serve as partial light emission areas, can correspond to the following optical means and effectively supply them with light.
Es besteht die Möglichkeit, dass die Ablenkmittel als nanoskalige Optikflächen ausge bildet sind, die insbesondere durch Laserbestrahlung in dem Lichtleiter erzeugt wur den. Die Optikflächen können durch partielle Brechungsindexvariationen in dem Mate rial des Lichtleiters oder auch durch Streuzentren realisiert werden, die durch partiel les Aufschmelzen des Lichtleitermaterials erzeugt werden. Insbesondere können meh rere der Optikflächen in einer einem Beugungsgitter entsprechenden Anordnung zu sammengefasst werden, um auf diese Weise die Ablenkung in einer vorgegebenen Richtung zu ermöglichen. There is the possibility that the deflection means are designed as nanoscale optical surfaces that were generated in the light guide in particular by laser irradiation. The optical surfaces can be realized by partial refractive index variations in the mate rial of the light guide or also by scattering centers that are produced by partial melting of the light guide material. In particular, several of the optical surfaces can be combined in an arrangement corresponding to a diffraction grating in order in this way to enable deflection in a predetermined direction.
Es kann vorgesehen sein, dass die Beleuchtungsvorrichtung Konvertermittel umfasst, die das Licht der Lichtquelle hinsichtlich seines Wellenlängenspektrums umwandeln, insbesondere wobei die Konvertermittel das Licht der Lichtquelle in Weißlicht umwan deln. Dabei können die Konvertermittel im Bereich der Auskoppelflächen angeordnet sein, insbesondere wobei insbesondere jeder Auskoppelfläche Konvertermittel zuge ordnet sind. Vorzugsweise kann jede Auskoppelfläche Konvertermittel aufweisen be ziehungsweise mit Konvertermitteln beschichtet sein, durch die das aus der Auskop pelfläche austretende Licht hindurchtritt. Auf diese Weise kann sicher gestellt werden, dass das Weißlicht nur an den Auskoppelflächen generiert wird, die wiederum pas send den Optikmitteln, insbesondere den Spiegeln oder Linsen zugeordnet sind. It can be provided that the lighting device comprises converter means which convert the light from the light source with regard to its wavelength spectrum, in particular wherein the converter means convert the light from the light source into white light. The converter means can be arranged in the region of the decoupling surfaces, in particular with converter means being assigned to each decoupling surface. Each decoupling surface can preferably have converter means or be coated with converter means through which the light emerging from the coupling surface passes. In this way it can be ensured that the white light is only generated on the decoupling surfaces, which in turn are appropriately assigned to the optical means, in particular the mirrors or lenses.
Es besteht die Möglichkeit, dass die mindestens eine Lichtquelle als Laserdiode aus gebildet ist. Beispielsweise kann eine Laserdiode verwendet werden, die blaues Licht erzeugt, das von den Konvertermitteln in Weißlicht umgewandelt werden kann. Alter nativ kann die mindestens eine Lichtquelle auch als Leuchtdiode ausgebildet sein, insbesondere als blaue Leuchtdiode um eine entsprechende Umwandlung in Weiß licht zu ermöglichen. There is the possibility that the at least one light source is formed as a laser diode. For example, a laser diode can be used which generates blue light which can be converted into white light by the converter means. Alternatively, the at least one light source can also be designed as a light-emitting diode, in particular as a blue light-emitting diode to enable a corresponding conversion into white light.
Es kann vorgesehen werden, dass die mindestens eine Lichtquelle im Scheinwerfer entfernt von den Optikmitteln angeordnet ist, beispielsweise an einer Stelle im It can be provided that the at least one light source is arranged in the headlight away from the optical means, for example at one point in the
Scheinwerfer mit idealen thermischen Bedingungen für den Betrieb der mindestens einen Lichtquelle und für die Integration von Schutzmechanismen. Da das von der mindestens einen Lichtquelle ausgehende Licht mittels des Lichtleiters zu den Optik mitteln transportiert wird und der Lichtleiter nur an den Auskoppelflächen leuchtet, tre ten bei der Lichtzuleitung und den nicht-lichtabstrahlenden Lichtleiterbereichen keine Verluste auf. Headlights with ideal thermal conditions for operating the at least one light source and for integrating protective mechanisms. Since the light emanating from the at least one light source is transported by means of the light guide to the optics and the light guide only lights up at the coupling-out surfaces, there are no losses in the light feed and the non-light-emitting light guide areas.
Anhand der beigefügten Zeichnungen wird die Erfindung nachfolgend näher erläutert. Dabei zeigt: The invention is explained in more detail below with reference to the accompanying drawings. It shows:
Fig. 1 eine perspektivische Detailansicht einer ersten Ausführungsform einer er findungsgemäßen als Scheinwerfer ausgebildeten Beleuchtungsvorrich tung; Fig. 1 is a perspective detailed view of a first embodiment of a device according to the invention designed as a headlight lighting device;
Fig. 2 eine perspektivische Detailansicht einer zweiten Ausführungsform einer erfindungsgemäßen als Scheinwerfer ausgebildeten Beleuchtungsvorrich tung; 2 is a perspective detailed view of a second embodiment of a lighting device according to the invention designed as a headlight;
Fig. 3 ein Detail einer Draufsicht auf eine dritte Ausführungsform einer erfin dungsgemäßen als Scheinwerfer ausgebildeten Beleuchtungsvorrichtung. In den Figuren sind gleiche oder funktional gleiche Teile mit gleichen Bezugszeichen versehen. 3 shows a detail of a top view of a third embodiment of a lighting device according to the invention designed as a headlight. Identical or functionally identical parts are provided with the same reference symbols in the figures.
Die in den Figuren abgebildeten Ausführungsformen einer erfindungsgemäßen Be leuchtungsvorrichtung umfassen mindestens eine in Fig. 2 schematisch angedeutete Lichtquelle 1 , die insbesondere als Laserdiode ausgebildet ist. Vorzugsweise emittiert die Laserdiode blaues Licht 2, beispielsweise mit einer Wellenlänge von 450 nm oder 405 nm. The embodiments of a lighting device according to the invention shown in the figures comprise at least one light source 1, indicated schematically in FIG. 2, which is in particular designed as a laser diode. The laser diode preferably emits blue light 2, for example with a wavelength of 450 nm or 405 nm.
Die Beleuchtungsvorrichtung umfasst weiterhin einen Lichtleiter 3, in den das von der mindestens einen Lichtquelle ausgehende Licht 2 an einer der Stirnseiten 4 des Licht leiters 3 eingekoppelt wird. Der Lichtleiter 3 kann insbesondere dünn und flexibel sein. Insbesondere kann der Lichtleiter 3 einen Durchmesser zwischen 0,1 mm und 0,3 mm, beispielsweise einen Durchmesser von etwa 0,2 mm aufweisen. The lighting device further comprises a light guide 3 into which the light 2 emanating from the at least one light source is coupled at one of the end faces 4 of the light guide 3. The light guide 3 can in particular be thin and flexible. In particular, the light guide 3 can have a diameter between 0.1 mm and 0.3 mm, for example a diameter of approximately 0.2 mm.
Der Lichtleiter 3 weist mehrere in Längsrichtung des Lichtleiters 3 zueinander beab- standete Ablenkmittel (nicht abgebildet) auf, von denen Teile des Lichts 2 in radialer Richtung abgelenkt werden. Die Ablenkmittel können insbesondere als Optikflächen ausgebildet sein, von denen jeweils mehrere in einer einem Beugungsgitter entspre chenden Anordnung zusammengefasst sind. Die nanoskalige Optikflächen können insbesondere unter einem Winkel von beispielsweise 45° zur Längsrichtung des Licht leiters 3 angeordnet sein, so dass eine Reflexion der Teile des Lichts 2 überwiegend in genau eine radiale Richtung stattfindet. The light guide 3 has a plurality of deflection means (not shown) which are spaced apart from one another in the longitudinal direction of the light guide 3 and by which parts of the light 2 are deflected in the radial direction. The deflection means can in particular be designed as optical surfaces, several of which are combined in an arrangement corresponding to a diffraction grating. The nanoscale optical surfaces can in particular be arranged at an angle of, for example, 45 ° to the longitudinal direction of the light guide 3, so that a reflection of the parts of the light 2 takes place predominantly in exactly one radial direction.
Der Lichtleiter 3 weist weiterhin mehrere in Längsrichtung des Lichtleiters 3 zueinan der beabstandete Auskoppelflächen 5 im Mantelbereich des Lichtleiters 3 auf, durch die Licht 2 aus dem Lichtleiter 3 in radialer Richtung austreten kann. Dabei sind jeder der Auskoppelflächen 5 Ablenkmittel zugeordnet, so dass der von den Ablenkmitteln in radialer Richtung abgelenkte Anteil 6 des Lichts 2 auf eine der Auskoppelflächen 5 auftrifft und aus dieser zumindest teilweise austritt. Insbesondere sind dabei die Aus- koppelflächen 5 jeweils genau dort angeordnet, wo der abgelenkte Anteil 6 des Lichts 2 auf die Mantelfläche des Lichtleiters 3 auftrifft (siehe Fig. 2). The light guide 3 furthermore has several coupling-out surfaces 5 spaced apart in the longitudinal direction of the light guide 3 in the jacket region of the light guide 3, through which light 2 can exit the light guide 3 in the radial direction. Deflection means are assigned to each of the decoupling surfaces 5, so that the portion 6 of the light 2 deflected in the radial direction by the deflection means strikes one of the decoupling surfaces 5 and at least partially exits it. In particular, the training coupling surfaces 5 each arranged exactly where the deflected portion 6 of the light 2 strikes the outer surface of the light guide 3 (see FIG. 2).
Im Bereich einer jeder der Auskoppelflächen 5 sind Konvertermittel angeordnet, ins besondere als lichtkonvertierende Schicht auf jeder der Auskoppelflächen 5, durch die der Anteil 6 des Lichts 2 zumindest teilweise hindurchtreten kann. Die lichtkonvertie rende Schicht kann beispielsweise einen Teil der blauen Lichts 2 in gelbes Licht kon vertieren sowie das blaue Licht streuen, so dass in Summe ein weißer Farbeindruck erreicht wird. Auch andere Arten von Konvertermitteln können verwendet werden. Vor teilhaft dabei ist es, wenn die Konvertermittel nur im Bereich der Auskoppelflächen 5 angeordnet sind. In the area of each of the decoupling surfaces 5, converter means are arranged, in particular as a light-converting layer on each of the decoupling surfaces 5, through which the portion 6 of the light 2 can at least partially pass. The light-converting layer can, for example, convert part of the blue light 2 into yellow light and scatter the blue light so that, in total, a white color impression is achieved. Other types of converter means can also be used. It is advantageous if the converter means are arranged only in the region of the coupling-out surfaces 5.
Die in Fig. 1 und Fig. 2 abgebildeten Ausführungsformen einer erfindungsgemäßen Beleuchtungsvorrichtung umfassen weiterhin eine Mehrzahl von Spiegeln 7, die den aus den Auskoppelflächen 5 ausgetretenen Anteil 6 des Lichts 2 reflektieren. Dabei ist einer jeden der Auskoppelflächen 5 ein Spiegel 7 zugeordnet, so dass der aus der entsprechenden Auskoppelfläche 5 ausgetretene Anteil 6 des Lichts 2 nur genau von dem zugeordneten Spiegel 7 reflektiert wird. The embodiments of a lighting device according to the invention depicted in FIGS. 1 and 2 furthermore comprise a plurality of mirrors 7 which reflect the portion 6 of the light 2 that has emerged from the coupling-out surfaces 5. A mirror 7 is assigned to each of the coupling-out surfaces 5, so that the portion 6 of the light 2 that has emerged from the corresponding coupling-out surface 5 is only reflected precisely by the associated mirror 7.
Der Lichtleiter 3 ist in diesen Ausführungsbeispielen an einer Reihe von Spiegeln 7 entlang geführt, für die durch die Auskoppelflächen 5 mit Konvertermitteln jeweils eine langgestreckte und zugleich schmale Leuchtfläche generiert wird. Die Leuchtfläche wird abschnittsweise am Lichtleiter 3 durch die Konvertermittel realisiert, die in einer beliebigen gewünschten Länge für jeden Spiegel 7 eine schmale Leuchtfläche bereit stellen. Der aus den Auskoppelflächen 5 austretende Anteil 6 des Lichts 2 wird dann gerichtet auf den Spiegel 7 abgestrahlt. Streulicht wie bei breiter abstrahlenden Leuchtdioden wird dabei weitgehend vermieden. In these exemplary embodiments, the light guide 3 is guided along a row of mirrors 7, for each of which an elongated and at the same time narrow luminous surface is generated by the coupling-out surfaces 5 with converter means. The luminous surface is realized in sections on the light guide 3 by the converter means, which provide a narrow luminous surface in any desired length for each mirror 7. The portion 6 of the light 2 emerging from the decoupling surfaces 5 is then emitted in a directed manner onto the mirror 7. Scattered light, as is the case with light-emitting diodes radiating more widely, is largely avoided.
An den Übergängen zwischen zwei Spiegeln 7 weist der Lichtleiter 3 keine Auskoppel flächen 5 mit Konvertermitteln auf und strahlt somit auch kein Licht ab. Es wird auf diese Weise entlang der Spiegelanordnung ein Lichtleiter 3 mit abwechselnd lichtab- strahlenden Leuchtbereichen und jeweils dazwischen angeordneten nicht- lichtabstrahlenden Bereichen realisiert. At the transitions between two mirrors 7, the light guide 3 has no decoupling surfaces 5 with converter means and therefore does not emit any light. In this way, a light guide 3 with alternately light-emitting Realizing radiating light areas and non-light emitting areas arranged in between.
Fig. 1 zeigt, dass sich dieses Prinzip auch bei einer versetzten Spiegelanordnung und einem Abstand zwischen den Spiegeln 7 einfach umsetzen lässt, weil der Lichtleiter 3 für die Teilabschnitte gebogen und entlang der Spiegelstufung geführt und fixiert wer den kann. Fig. 1 shows that this principle can easily be implemented even with an offset mirror arrangement and a distance between the mirrors 7, because the light guide 3 is bent for the subsections and guided and fixed along the mirror gradation who can.
Die in Fig. 3 abgebildete Ausführungsform einer erfindungsgemäßen Beleuchtungs vorrichtung umfasst anstelle der Spiegel 7 eine Mehrzahl von Linsen 8, durch die die aus den Auskoppelflächen 5 ausgetretenen Anteile 6 des Lichts 2 hindurchtreten. Da bei ist einer jeden der Auskoppelflächen 5 eine Linse 8 zugeordnet, so dass der aus der entsprechenden Auskoppelfläche 5 ausgetretene Anteil 6 des Lichts 2 nur genau durch die zugeordnete Linse 8 hindurchtritt. The embodiment of a lighting device according to the invention shown in FIG. 3 comprises, instead of the mirrors 7, a plurality of lenses 8, through which the portions 6 of the light 2 that have emerged from the coupling-out surfaces 5 pass. A lens 8 is assigned to each of the coupling-out surfaces 5, so that the portion 6 of the light 2 that has emerged from the corresponding coupling-out surface 5 only passes precisely through the assigned lens 8.
Hier ist der Lichtleiter 3 ebenfalls bei einer versetzten Linsenanordnung und bei ent sprechendem Abstand zwischen den Linsen 8 gebogen und entlang der Linsenstu fung geführt und fixiert. Here, the light guide 3 is also bent with an offset lens arrangement and with a corresponding distance between the lenses 8 and guided and fixed along the Linsenstu fungus.
Bezugszeichenliste List of reference symbols
1 Lichtquelle 1 light source
2 Licht 2 light
3 Lichtleiter 3 light guides
4 Stirnseite des Lichtleiters 4 end face of the light guide
5 Auskoppelfläche 5 coupling area
6 aus der Auskoppelfläche ausgetretener Anteil des Lichts 6 Part of the light exited from the coupling-out surface
7 Spiegel 7 mirrors
8 Linse 8 lens

Claims

Patentansprüche Claims
1. Beleuchtungsvorrichtung für ein Kraftfahrzeug, insbesondere Scheinwerfer für ein Kraftfahrzeug, umfassend 1. A lighting device for a motor vehicle, in particular a headlight for a motor vehicle, comprising
- mindestens eine Lichtquelle (1 ), von der im Betrieb der Beleuchtungs vorrichtung Licht (2) ausgeht, - At least one light source (1) from which light (2) emanates when the lighting device is in operation,
- einen Lichtleiter (3), in den im Betrieb der Beleuchtungsvorrichtung das von der mindestens eine Lichtquelle (1 ) ausgehende Licht (2) eingekop pelt wird, - A light guide (3) into which the light (2) emanating from the at least one light source (1) is coupled during operation of the lighting device,
- mindestens eine Auskoppelfläche (5), aus der im Betrieb der Beleuch tungsvorrichtung das Licht (2) aus dem Lichtleiter (3) austritt, - At least one decoupling surface (5) from which the light (2) emerges from the light guide (3) when the lighting device is in operation,
- Optikmittel, durch die im Betrieb der Beleuchtungsvorrichtung das aus der Auskoppelfläche (5) ausgetretene Licht (2) hindurchtritt oder von de nen im Betrieb der Beleuchtungsvorrichtung das aus der Auskoppelflä che (5) ausgetretene Licht (2) reflektiert wird, - Optical means through which the light (2) emerging from the coupling-out surface (5) passes when the lighting device is in operation or through which the light (2) emerging from the coupling-out surface (5) is reflected when the lighting device is in operation,
dadurch gekennzeichnet, dass der Lichtleiter (3) mehrere Auskoppelflä chen (5) umfasst, die voneinander beabstandet sind. characterized in that the light guide (3) comprises a plurality of coupling-out surfaces (5) which are spaced from one another.
2. Beleuchtungsvorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die Beleuchtungsvorrichtung mehrere Optikmittel umfasst, durch die das aus den mehreren Auskoppelflächen (5) im Betrieb der Beleuchtungs vorrichtung austretende Licht (2) hindurchtritt, wobei insbesondere jeder der Auskoppelflächen (5) Optikmittel zugeordnet sind. 2. Lighting device according to claim 1, characterized in that the lighting device comprises a plurality of optical means through which the light (2) emerging from the plurality of coupling-out surfaces (5) during operation of the lighting device passes, wherein in particular each of the coupling-out surfaces (5) is assigned optical means .
3. Beleuchtungsvorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Optikmittel als Spiegel (7) ausgebildet sind oder mindestens einen Spiegel (7) umfassen. 3. Lighting device according to one of claims 1 or 2, characterized in that the optical means are designed as a mirror (7) or comprise at least one mirror (7).
4. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Optikmittel als Linse (8) ausgebildet sind oder mindestens eine Linse (8) umfassen. 4. Lighting device according to one of claims 1 to 3, characterized in that the optical means are designed as a lens (8) or comprise at least one lens (8).
5. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Größe mindestens einer der Auskoppelflächen (5) an die Größe der Optikmittel angepasst ist. 5. Lighting device according to one of claims 1 to 4, characterized in that the size of at least one of the coupling-out surfaces (5) is adapted to the size of the optical means.
6. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Lichtleiter (3) Ablenkmittel umfasst, die das sich in dem Lichtleiter (3) ausbreitende Licht (2) jeweils teilweise in Richtung auf die Auskoppelflächen (5) ablenken, wobei insbesondere jeder Auskoppel fläche (5) Ablenkmittel zugeordnet sind. 6. Lighting device according to one of claims 1 to 5, characterized in that the light guide (3) comprises deflection means which deflect the light (2) propagating in the light guide (3) in each case partially in the direction of the coupling-out surfaces (5), wherein In particular, each decoupling surface (5) are assigned deflection means.
7. Beleuchtungsvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass das von den Ablenkmitteln abgelenkte Licht (2) im Wesentlichen aus schließlich auf die Auskoppelflächen (5) trifft und durch diese aus dem Lichtleiter (3) austritt. 7. Lighting device according to claim 6, characterized in that the light (2) deflected by the deflection means essentially only hits the coupling-out surfaces (5) and exits the light guide (3) through them.
8. Beleuchtungsvorrichtung nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass die Ablenkmittel als nanoskalige Optikflächen aus gebildet sind, die insbesondere durch Laserbestrahlung in dem Lichtleiter (3) erzeugt wurden. 8. Lighting device according to one of claims 6 or 7, characterized in that the deflection means are formed as nanoscale optical surfaces, which were generated in particular by laser irradiation in the light guide (3).
9. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Beleuchtungsvorrichtung Konvertermittel umfasst, die das Licht (2) der Lichtquelle (1 ) hinsichtlich seines Wellenlängenspekt rums umwandeln, insbesondere wobei die Konvertermittel das Licht (2) der Lichtquelle (1 ) in Weißlicht umwandeln. 9. Lighting device according to one of claims 1 to 8, characterized in that the lighting device comprises converter means which convert the light (2) of the light source (1) in terms of its wavelength spectrum, in particular wherein the converter means the light (2) of the light source (1 ) convert to white light.
10. Beleuchtungsvorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Konvertermittel im Bereich der Auskoppelflächen (5) angeordnet sind, insbesondere wobei insbesondere jeder Auskoppelfläche (5) Konver termittel zugeordnet sind. 10. Lighting device according to claim 9, characterized in that the converter means are arranged in the region of the decoupling surfaces (5), in particular where each decoupling surface (5) are associated with converter means.
1 1 . Beleuchtungsvorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass jede Auskoppelfläche (5) Konvertermittel aufweist beziehungsweise mit Konvertermitteln beschichtet ist, durch die das aus der Auskoppelfläche (5) austretende Licht (2) hindurchtritt. 1 1. Lighting device according to Claim 10, characterized in that each decoupling surface (5) has converter means or is coated with converter means through which the light (2) emerging from the decoupling surface (5) passes.
12. Beleuchtungsvorrichtung nach einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, dass die mindestens eine Lichtquelle (1 ) als Laserdiode ausgebildet ist. 12. Lighting device according to one of claims 1 to 11, characterized in that the at least one light source (1) is designed as a laser diode.
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