EP3135988A1 - Illumination device for a vehicle - Google Patents
Illumination device for a vehicle Download PDFInfo
- 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
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- European Patent Office
- Prior art keywords
- light
- wavelength
- laser diode
- conversion
- conversion element
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- 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.)
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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)
Abstract
Die vorliegende Erfindung betrifft eine Beleuchtungsvorrichtung für ein Fahrzeug, umfassend eine Laserdiodenanordnung, aufweisend eine Anzahl im Wesentlichen monochromatischer Laserdioden, eine optische Einrichtung und ein Lichtwellenlängenkonversionselement zur Wellenlängenkonversion, wobei die optische Einrichtung ausgebildet ist, das von der Laserdiodenanordnung erzeugte Licht auf das Lichtwellenlängenkonversionselement zu lenken, und wobei das Lichtwellenlängenkonversionselement ausgebildet ist, das über die optische Einrichtung auf das Lichtwellenlängenkonversionselement gelenkte Licht der Laserdiodenanordnung zumindest anteilig in Licht anderer Wellenlänge zu konvertieren. Die Beleuchtungsvorrichtung zeichnet sich dadurch aus, dass die Laserdiodenvorrichtung (7) ausgebildet ist, Laserstrahlung mindestens zweier unterschiedlicher Wellenlängen (»1, »2) zu erzeugen.The present invention relates to a lighting apparatus 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, the optical device configured to direct the light generated by the laser diode array to the light wavelength conversion element. and wherein 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 a different wavelength. The illumination device is characterized in that the laser diode device (7) is designed to generate laser radiation of at least two different wavelengths (»1,» 2).
Description
Die vorliegende Erfindung betrifft eine Beleuchtungsvorrichtung für ein Fahrzeug, umfassend eine Laserdiodenanordnung, aufweisend eine Anzahl im Wesentlichen monochromatischer Laserdioden; eine optische Einrichtung; und ein Lichtwellenlängenkonversionselement zur Wellenlängenkonversion, wobei die optische Einrichtung ausgebildet ist, das von der Laserdiodenanordnung erzeugte Licht auf das Lichtwellenlängenkonversionselement zu lenken, und wobei das Lichtwellenlängenkonversionselement ausgebildet ist, das über die optische Einrichtung auf das Lichtwellenlängenkonversionselement gelenkte Licht der Laserdiodenanordnung zumindest anteilig in Licht anderer Wellenlänge zu konvertieren.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.
Insbesondere im Automobilbau ist seit Jahren ein Trend hin zu kleineren, hocheffizienten Scheinwerfermodulen erkennbar, mit Hilfe derer auf kleinstem Bauraum leistungsstarke Lichtquellen realisiert werden sollen. Es ist abzusehen, dass die bereits etablierten LED-Scheinwerfermodule in naher Zukunft von Laserlichtquellen ersetzt werden, da Laserlichtquellen verbesserte Leuchtdichten, eine höhere Effizienz sowie erweiterte Anwendungen ermöglichen können. Ein derartiges Anwendungsbeispiel sind projizierende, hochauflösende Matrixscheinwerfer, die dynamisch an die gegebene Fahrbahnsituation angepasst werden können.Especially in the automotive industry, a trend towards smaller, highly efficient headlight modules has been recognizable for years, with the help of which high-performance light sources are to be realized in the smallest possible space. It is foreseeable that the already established LED headlamp modules will be replaced by laser light sources in the near future as laser light sources can provide improved luminance, efficiency and advanced applications. Such an example of application are projecting, high-resolution matrix headlights, which can be adapted dynamically to the given roadway situation.
Die
Diese Vorrichtung hat zweierlei Nachteile. Zum einen entstehen bei der anteiligen Umwandlung des Lichts aus einem bläulichen in einen gelblichen Bereich, dem sogenannten Stokes-Shift, hohe Energieverluste, die als Wärmestrahlung emittiert werden und aufwändig abgeführt werden müssen. Der zweite, wesentliche Nachteil ist die inhomogene Spektralverteilung, die durch die Mischung aus konvertiertem, polychromatischem Licht im gelblichen Bereich und aus nicht konvertiertem, quasi-monochromatischem Licht erhalten wird. Dies führt zu verfälschten Farbwahrnehmungen, welche im Straßenverkehr zum Nachteil des Fahrers gereichen können.This device has two disadvantages. On the one hand, the proportionate conversion of light from a bluish to a yellowish region, the so-called Stokes shift, results in high energy losses, which are emitted as heat radiation and have to be dissipated in a complex manner. 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.
In der
Es ist somit Aufgabe der Erfindung, eine verbesserte Beleuchtungsvorrichtung für ein Fahrzeug bereitzustellen, mit der Nachteile herkömmlicher Beleuchtungsvorrichtungen vermieden werden können. Es ist insbesondere eine Aufgabe der Erfindung, eine Beleuchtungsvorrichtung für ein Fahrzeug bereitzustellen, die eine verbesserte Energie- sowie Spektralbilanz aufweist.It is therefore an object of the invention to provide an improved lighting device for a vehicle, with the disadvantages of conventional lighting devices can be avoided. It is a particular object of the invention to provide a lighting device for a vehicle having an improved energy and spectral balance.
Die Erfindung löst die Aufgaben durch eine Beleuchtungsvorrichtung für ein Fahrzeug mit den Merkmalen des Patentanspruchs 1. Vorteilhafte Ausführungsformen der Erfindung ergeben sich aus den abhängigen Ansprüchen und werden in der folgenden Beschreibung unter teilweiser Bezugnahme auf die Figuren näher erläutert.The invention achieves the objects by a lighting device for a vehicle with the features of
Gemäß allgemeinen Gesichtspunkten der Erfindung wird eine Beleuchtungsvorrichtung für ein Fahrzeug bereitgestellt, umfassend eine Laserdiodenanordnung, aufweisend eine Anzahl Laserdioden, eine optische Einrichtung und ein Lichtwellenlängenkonversionselement zur Wellenlängenkonversion. Die optische Einrichtung ist hierbei ausgebildet, das von der Laserdiodenanordnung erzeugte Licht auf das Lichtwellenlängenkonversionselement zu lenken. Das Lichtwellenlängenkonversionselement ist ausgebildet, das über die optische Einrichtung auf das Lichtwellenlängenkonversionselement gelenkte Licht der Laserdiodenanordnung zumindest anteilig in Licht anderer Wellenlängen zu konvertieren.According to general aspects of the invention, there is provided 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.
Die Beleuchtungsvorrichtung zeichnet sich dadurch aus, dass die Laserdiodenanordnung ausgebildet ist, Laserstrahlung mindestens zweier unterschiedlicher Wellenlängen (λ1, λ2) zu erzeugen. Mit anderen Worten weist die Laserdiodenanordnung mindestens zwei Arten quasi-monochromatischer Laserdioden auf, die sich dadurch unterscheiden, dass sie quasi-monochromatisches Laserlicht unterschiedlicher Wellenlänge emittieren, so dass im Betrieb der Beleuchtungsvorrichtung Laserlicht mindestens zweier unterschiedlicher Wellenlängen gleichzeitig auf das Lichtwellenlängenkonversionselement trifft. Der wesentliche Vorteil der Erfindung ist darin begründet, dass aufgrund der Verwendung zumindest zweier unterschiedlicher Wellenlängen als Eingangsgröße eine deutlich energieeffizientere Konversion in ein Gesamtspektrum erfolgen kann.The illumination device is characterized in that the laser diode arrangement is designed to generate laser radiation of at least two different wavelengths (λ1, λ2). In other words, 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.
Gemäß einem weiteren Aspekt der Erfindung kann das Lichtwellenlängenkonversionselement ausgebildet sein, das eingestrahlte Licht der Laserdiodenanordnung in einen vorbestimmten Wellenlängenbereich und/oder in ein gewünschtes nicht-kohärentes, polychromatisches Lichtspektrum zu konvertieren. Beispielsweise kann die Beleuchtungsvorrichtung so ausgebildet sein, dass sie ein als weiß wahrgenommenes Licht erzeugt.According to another aspect of the invention, 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. For example, the lighting device may be configured to produce a light perceived as white.
Lichtwellenlängenkonversionselemente sind an sich aus dem Stand der Technik bekannt. Bei diesen Lichtwellenlängenkonversionselementen, z. B. in Form von sog. Konversionsschichten bzw. einem Konversionsmedium wird das eingestrahlte Licht in Strahlung größerer Wellenlänge umgewandelt. Hierbei wird beispielsweise mittels eines Konvertermaterials, auch als Konversionsstoff bezeichnet, Laserlicht absorbiert, insbesondere kohärentes Laserlicht mit einem stark eingeschränkten Wellenlängenspektrum. Durch den Energieeintrag aus dem Laserlicht werden im Konvertermaterial befindliche Elektronen durch das Laserlicht in höhere Energieniveaus angeregt. Beim Zurückfallen der Elektronen auf ihr ursprüngliches Energieniveau emittiert das Konvertermaterial Licht der dem Energieniveau entsprechenden Wellenlänge. Üblicherweise ist das von dem Lichtwellenlängenkonversionselement emittierte Licht nicht monochromatisch, sondern erfährt während des Konversionsvorgangs eine spektrale Aufweitung in ein in Grenzen polychromatisches Lichtspektrum. Je nach Lichtwellenlänge der Eingangsgröße kommen unterschiedliche Konvertermaterialien zum Einsatz. Beispielsweise können geeignete Phoshor-Konverter als Konvertermaterial des Lichtwellenlängenkonversionselementes verwendet werden, die auf unterschiedliche Wellenlängen, insbesondere auf verschiedenfarbige Strahlung, ansprechen, Ein Beispiel ist der Phoshor der Firma Phoshortech Corporation, 3645 Kennesaw North Industrial Parkway, Kennesaw, Ga 30144, USA, der mit dem Produktnamen HTR650 vertrieben wird. Weitere Konvertermaterialien sind beispielsweise Yttrium-Aluminium-Granat (YAG) oder Erdalkali-Ortho-Silikat (BO-SE).Light wavelength conversion elements are known per se from the prior art. In 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. In this case, for example by means of a converter material, also referred to as conversion substance, 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. Usually, 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. Depending on the light wavelength of the input variable different converter materials are used. For example, 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, An example is the 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).
Gemäß einer bevorzugten Ausführungsform kann das Lichtwellenlängenkonversionselement ausgebildet sein, das eingestrahlte Licht einer ersten Wellenlänge λ1 der Laserdiodenanordnung zumindest anteilig in einen ersten vorbestimmten Konversions-Wellenlängenbereich zu konvertieren und das eingestrahlte Licht einer zweiten Wellenlänge λ2 der Laserdiodenanordnung zumindest anteilig in einen zweiten vorbestimmten Konversions-Wellenlängenbereich zu konvertieren, wobei für λ1<λ2 gilt, dass der erste Konversions-Wellenlängenbereich im Vergleich zum zweiten Konversions-Wellenlängenbereich hin zu kleineren Wellenlängen verschoben ist. Dies bedeutet, dass der erste Konversions-Wellenlängenbereich auf einer Wellenlängenachse in Richtung zunehmender Wellenlänge links vom zweiten Konversions-Wellenlängenbereich liegt. Dies bietet den besonderen Vorzug, dass das erzeugte polychromatische Lichtspektrum der Beleuchtungsvorrichtung nicht ausschließlich durch Konvertierung aus einer einzigen Ausgangswellenlänge λ1, z. B. der Grundfarbe Blau, erzeugt werden muss, sondern größere Wellenlängen aus der größeren Ausgangswellenlänge λ2 erzeugt werden können, wodurch der durch den Stokes-Shift resultierende Energieverlust bei der Konvertierung wesentlich reduziert werden kann. Gemäß dieser Ausführungsform spricht das Konvertermaterial somit sowohl auf die erste Wellenlänge λ1 als auch auf die Wellenlänge λ2 an, beispielsweise können zwei entsprechende Konversionsschichten im Lichtwellenlängenkonversionselement vorgesehen sein.According to a preferred embodiment, the light wavelength conversion element can be configured to at least partially convert the irradiated light of a first wavelength λ1 of the laser diode array into a first predetermined conversion wavelength range and at least partially distribute the irradiated light of a second wavelength λ2 of the laser diode array into a second predetermined conversion wavelength range for λ1 <λ2, the first conversion wavelength range is shifted toward smaller wavelengths as compared with the second conversion wavelength range. This means that 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. This offers the particular advantage that the generated polychromatic light spectrum of the illumination device is not limited solely by conversion from a single output wavelength λ1, e.g. As the primary color blue, must be generated, but larger wavelengths can be generated from the larger output wavelength λ2, whereby the resulting by the Stokes shift energy loss during the conversion can be significantly reduced. According to this embodiment, the converter material thus responds both to the first wavelength λ1 and to the wavelength λ2, for example, two corresponding conversion layers may be provided in the light wavelength conversion element.
Um eine besonders energieeffiziente Konversion zu ermöglichen, kann die Laserdiodenanordnung ausgebildet sein, Laserstrahlung dreier unterschiedlicher Wellenlängen (λ1, λ2, λ3) zu erzeugen. Gemäß einer besonders bevorzugten Ausführungsvariante ist die Laserdiodenanordnung ausgebildet, Laserstrahlen mit Emissionswellenlängen in den Grundfarben Rot (λ1), Grün (λ2) und Blau (λ3) zu erzeugen. Gemäß diesen Varianten spricht das Konvertermaterial somit sowohl auf die erste Wellenlänge λ1, die zweite Wellenlänge λ2 als auch auf die dritte Wellenlänge λ3 an, beispielsweise können drei entsprechende Konversionsschichten im Lichtwellenlängenkonversionselement vorgesehen sein.In order to enable a particularly energy-efficient conversion, the laser diode array can be designed to generate laser radiation of three different wavelengths (λ1, λ2, λ3). According to a particularly preferred embodiment variant, the laser diode arrangement is designed to generate laser beams with emission wavelengths in the primary colors red (λ1), green (λ2) and blue (λ3). According to these variants, the converter material thus responds both to the first wavelength λ1, the second wavelength λ2 and to the third wavelength λ3, for example, three corresponding conversion layers may be provided in the light wavelength conversion element.
Eine Möglichkeit der erfindungsgemäßen Realisierung dieser Variante sieht hierbei vor, dass das Lichtwellenlängenkonversionselement ausgebildet ist, Laserstrahlen einer Grundfarbe, also einen quasi-monochromen Spektralbereich, jeweils in einen breiteren Spektralbereich aufzuweiten. Die Aufweitung bezieht sich erfindungsgemäß stets auf eine Wellenlängenvergrößerung. So können beispielsweise Laserstrahlen mit Emissionswellenlängen λ1 in der Grundfarbe Rot zumindest anteilig in Licht aus einem ersten Konversions-Wellenlängenbereich konvertiert werden. Laserstrahlen mit Emissionswellenlängen λ2 in der Grundfarbe Grün können zumindest anteilig in Licht aus einem zweiten Konversions-Wellenlängenbereich konvertiert werden, und Laserstrahlen mit Emissionswellenlängen λ3 in der Grundfarbe Blau können zumindest anteilig in Licht aus einem dritten Konversions-Wellenlängenbereich konvertiert werden, wobei der erste Konversions-Wellenlängenbereich im Vergleich zum zweiten Konversions-Wellenlängenbereich hin zu größeren Wellenlängen verschoben ist und der zweite Konversions-Wellenlängenbereich im Vergleich zum dritten Konversions-Wellenlängenbereich ebenfalls hin zu größeren Wellenlängen verschoben ist. Demnach ist der erste Konversions-Wellenlängenbereich auf einer Wellenlängenachse in Richtung zunehmender Wellenlänge rechts vom zweiten Konversions-Wellenlängenbereich positioniert und dieser rechts vom dritten Konversions-Wellenlängenbereich positioniert.One possibility of implementing this variant according to the invention in this case provides that 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 λ1 in the Basic color red at least partially converted into light from a first conversion wavelength range. Laser beams with emission wavelengths λ2 in the primary color green can at least partially be converted into light from a second conversion wavelength range, and laser beams with emission wavelengths λ3 in the primary color blue can be at least partially converted into light from a third conversion wavelength range, wherein the first conversion wavelength Wavelength range is shifted towards larger wavelengths compared to the second conversion wavelength range and the second conversion wavelength range is also shifted toward larger wavelengths compared to the third conversion wavelength range. Thus, 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.
Auf diese Weise kann eine besonders energieeffiziente Wellenlängenkonversion zur Erzeugung eines gewünschten polychromatischen Lichtspektrums realisiert werden, insbesondere, falls ein als weiß wahrgenommenes polychromatisches Lichtspektrum erzeugt werden soll.In this way, a particularly energy-efficient wavelength conversion for generating a desired polychromatic light spectrum can be realized, in particular if a perceived as white polychromatic light spectrum is to be generated.
Gemäß einer Variante der Erfindung kann die Laserdiodenanordnung ausgebildet sein, die Laserstrahlung in jeder der drei Wellenlängen, insbesondere Rot, Grün und Blau, in jeweils drei unterschiedlichen Polarisationsrichtungen zu erzeugen. Bei dieser Variante ist das Lichtwellenlängenkonversionselement ausgebildet, das über die optische Einrichtung auf das Lichtwellenlängenkonversionselement gelenkte Licht der Laserdiodenanordnung in Abhängigkeit von der Lichtwellenlänge und in Abhängigkeit von der Polarisationsrichtung zumindest anteilig in Licht anderer Wellenlänge zu konvertieren. Diese Variante kann insbesondere in Verbindung mit Technologien zu Vermeidung von Blendung durch Fahrzeugscheinwerfer vorteilhaft sein. Alternativ kann die Laserdiodenanordnung ausgebildet sein, die Laserstrahlung in jeder der drei Wellenlängen in nur einer oder zwei unterschiedlichen Polarisationsrichtungen zu erzeugen.According to a variant of the invention, 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. In this variant, 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. This variant can be particularly advantageous in connection with technologies for avoiding glare from vehicle headlights. Alternatively, 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.
Unter der vorgenannten optischen Einrichtung sollen alle optischen Einrichtungen bzw. Anordnungen verstanden werden, die ausgebildet sind, das von der Laserdiodenanordnung erzeugte Licht auf das Lichtwellenlängenkonversionselement zu lenken. Gemäß einem vorteilhaften Ausführungsbeispiel ist die optische Einrichtung ein Kombinierungselement, das ausgebildet ist, das von der Laserdiodenanordnung erzeugte Licht in einen Strahlengang zusammenzuführen. Das Kombinierungselement kann ein dichroitisches Element, insbesondere ein dichroitischer Würfel oder ein dichroitischer Spiegel sein. Unter einem dichroitischen Spiegel wird insbesondere ein Strahlvereiniger verstanden, mit Hilfe dessen mehrere Laserlichtstrahlen mit verschiedenen Wellenlängen in einen gemeinsamen Strahlengang zusammengeführt werden.The aforementioned 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. According to an advantageous embodiment, 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. Under a dichroic In particular, 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.
Die zuvor beschriebenen bevorzugten Ausführungsformen und Merkmale der Erfindung sind beliebig miteinander kombinierbar. Weitere Einzelheiten und Vorteile der Erfindung werden im Folgenden unter Bezug auf die beigefügten Zeichnungen beschrieben. Es zeigen:
Figur 1- eine stark vereinfachte, schematische Darstellung einer erfindungsgemäßen Beleuchtungsvorrichtung; und
Figur 2- schematisch, wie aus den emittierten Laserstrahlen durch teilweise Konversion ein polychromatisches Lichtwellenspektrum entsteht.
- FIG. 1
- a highly simplified, schematic representation of a lighting device according to the invention; and
- FIG. 2
- schematically, how from the emitted laser beams by partial conversion a polychromatic light wave spectrum is formed.
In
Die von der Laserdiodenanordnung 7 emittierten Lichtstrahlen λ1, λ2 und λ3 treffen auf ein Kombinierungselement 5, das als dichroitischer Würfel ausgeführt ist und die drei Strahlengänge der Lichtstrahlen λ1, λ2 und λ3 in einen Strahlengang 8 zusammenführt, der auf ein Lichtwellenlängenkonversionselement 6 gelenkt wird.The light beams λ1, λ2 and λ3 emitted by the
Das Lichtwellenlängenkonversionselement 6 ist ein nach dem Phosphor-Prinzip arbeitender Konverter, der auf mehrere Farben reagiert. Mit anderen Worten enthält das Element 6 ein Konvertermaterial, das sowohl auf die erste Wellenlänge A1, die zweite Wellenlänge λ2 als auch auf die dritte Wellenlänge λ3 anspricht, d. h. Licht dieser Wellenlängen zumindest anteilig in Licht größerer Wellenlänge konvertiert, so dass die drei quasi-monochromatischen Lichtstrahlen der Laserdioden 2, 3 und 4, die als zusammengeführter Lichtstrahl 8 auf das Lichtwellenlängenkonversionselement 6 treffen, in einen polychromatischen Lichtkegel 9 konvertiert werden. Das Konvertermaterial, d. h. der Leuchtstoff des Lichtwellenlängenkonversionselements 6, kann beispielsweise auf Yttrium-Aluminium-Granat (YAG) oder Erdalkali-Ortho-Silikat (BOSE) basieren.The light
Die auftreffende Strahlung wird in der Regel nur anteilig konvertiert, so dass ein Anteil unkonvertiert, d. h. ohne Wellenlängenkonversion, durchgelassen wird. Der Peak 30 bezeichnet den Anteil der durchgelassenen Strahlung der Wellenlänge λ1, der Peak 20 entsprechend den Anteil der durchgelassenen Strahlung der Wellenlänge λ2 und der Peak 30 entsprechend den Anteil der durchgelassenen Strahlung λ3.The incident radiation is usually only proportionately converted, so that a proportion unconverted, d. H. without wavelength conversion, is transmitted. The
Da das Lichtwellenlängenkonversionselement 6 jedoch auf alle drei Wellenlängen λ1, λ2 und λ3 anspricht, wird jeweils ein Anteil der auftreffenden Lichtstrahlen konvertiert.However, since the light
So konvertiert das Konvertermaterial des Wellenlängenkonversionselements 6 auftreffendes Licht der Wellenlänge λ1 in der Grundfarbe Rot zumindest anteilig in Licht aus einem ersten Konversions-Wellenlängenbereich 10', Licht der Wellenlänge λ2 in der Grundfarbe Grün zumindest anteilig in Licht aus einem zweiten Konversions-Wellenlängenbereich 20' und Licht der Wellenlänge λ3 in der Grundfarbe Blau zumindest anteilig in Licht aus einem dritten Konversions-Wellenlängenbereich 30'. Hierbei ist der erste Konversions-Wellenlängenbereich 10' im Vergleich zum zweiten Konversions-Wellenlängenbereich 20' hin zu größeren Wellenlängen verschoben, und der zweite Konversions-Wellenlängenbereich 20' ist wiederum im Vergleich zum dritten Konversions-Wellenlängenbereich 30' ebenfalls hin zu größeren Wellenlängen verschoben.Thus, the converter material of the
Das von der Beleuchtungsvorrichtung 1 somit erzeugte polychromatische Lichtspektrum 9 ergibt sich aus der Überlagerung, in
Die Erzeugung des zu erzeugenden Lichtspektrums 9 aus drei, statt wie üblich aus nur einer Ausgangswellenlänge im blauen Bereich, bietet den Vorteil, dass der durch den Stokes-Shift bedingte Energieverlust aufgrund der Konvertierung wesentlich kleiner ist, da der Energieverlust umso kleiner ist, je geringer die Differenz zwischen Ausgangswellen und der Wellenlänge des konvertierten Lichts ist.The generation of the
Obwohl die Erfindung unter Bezugnahme auf bestimmte Ausführungsbeispiele beschrieben worden ist, ist es für einen Fachmann ersichtlich, dass verschiedene Änderungen ausgeführt werden können und Äquivalente als Ersatz verwendet werden können, ohne den Bereich der Erfindung zu verlassen. Zusätzlich können viele Modifikationen ausgeführt werden, ohne den zugehörigen Bereich zu verlassen. Folglich soll die Erfindung nicht auf die offenbarten Ausführungsbeispiele begrenzt sein, sondern soll alle Ausführungsbeispiele umfassen, die in den Bereich der beigefügten Patentansprüche fallen. Insbesondere beansprucht die Erfindung auch Schutz für den Gegenstand und die Merkmale der Unteransprüche unabhängig von den in Bezug genommenen Ansprüchen.Although the invention has been described with reference to particular embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for without departing from the scope of the invention. In addition, many modifications can be made without leaving the associated area. Accordingly, the invention should not be limited to the disclosed embodiments, but should include all embodiments which fall within the scope of the appended claims. In particular, the invention also claims protection of the subject matter and the features of the subclaims independently of the claims referred to.
- 11
- Beleuchtungsvorrichtunglighting device
- 2, 3, 42, 3, 4
- Laserdiodenlaser diodes
- 55
- Optische EinrichtungOptical device
- 66
- LichtwellenlängenkonversionselementLight wavelength conversion element
- 77
- LaserdiodenanordnungThe laser diode
- 88th
- Kombinierter LichtstrahlCombined light beam
- 99
- Polychromatischer LichtkegelPolychromatic light cone
- 1010
- Nicht-konvertierte Energiefunktion der Farbe RotUnconverted energy function of the color red
- 10'10 '
- Konvertierte Energiefunktion der Farbe RotConverted energy function of the color red
- 2020
- Nicht-konvertierte Energiefunktion der Farbe GrünUnconverted energy function of the color green
- 20'20 '
- Konvertierte Energiefunktion der Farbe GrünConverted energy function of the color green
- 3030
- Nicht-konvertierte Energiefunktion der Farbe BlauUnconverted energy function of the color blue
- 30'30 '
- Konvertierte Energiefunktion der Farbe BlauConverted energy function of the color blue
- 1212
- Leistungpower
- 1313
- Summe des nicht-konvertierten LichtsSum of unconverted light
- 1414
- Summe des konvertierten LichtsSum of the converted light
- λ1, λ2, λ3λ1, λ2, λ3
- Emissionswellenlänge der LaserdiodeEmission wavelength of the laser diode
Claims (11)
wobei das Lichtwellenlängenkonversionselement (6) ausgebildet ist, das über die optische Einrichtung (5) auf das Lichtwellenlängenkonversionselement (6) gelenkte Licht der Laserdiodenanordnung (7) zumindest anteilig in Licht anderer Wellenlänge zu konvertieren,
dadurch gekennzeichnet, dass die Laserdiodenanordnung (7) ausgebildet ist, Laserstrahlung mindestens zweier unterschiedlicher Wellenlängen (λ1, λ2) zu erzeugen.Lighting device (1) for a vehicle, comprising
wherein the light wavelength conversion element (6) is designed to at least partially convert the light of the laser diode arrangement (7) guided via the optical device (5) onto the light wavelength conversion element (6) into light of a different wavelength,
characterized in that the laser diode array (7) is adapted to generate laser radiation of at least two different wavelengths (λ1, λ2).
dass die Laserdiodenanordnung (7) ausgebildet ist, Laserstrahlen mit Emissionswellenlängen in den Grundfarben Rot (λ1), Grün (λ2) und Blau (λ3) zu erzeugen.Lighting device (1) according to one of the preceding claims, characterized
in that the laser diode arrangement (7) is designed to generate laser beams with emission wavelengths in the primary colors red (λ1), green (λ2) and blue (λ3).
dass das Lichtwellenlängenkonversionselement (6) ausgebildet ist,
in that the light wavelength conversion element (6) is formed,
dass das Kombinierungselement ein dichroitisches Element, insbesondere ein dichroitischer Würfel oder dichroitischer Spiegel, ist.Lighting device (1) according to claim 8, characterized in that
that the combining element is a dichroic element, in particular a dichroic cube or dichroic mirror.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015011126.4A DE102015011126A1 (en) | 2015-08-26 | 2015-08-26 | Lighting device for a vehicle |
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| Publication Number | Publication Date |
|---|---|
| EP3135988A1 true EP3135988A1 (en) | 2017-03-01 |
| EP3135988B1 EP3135988B1 (en) | 2019-03-13 |
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| EP16001457.7A Active EP3135988B1 (en) | 2015-08-26 | 2016-06-29 | Illumination device for a vehicle |
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| DE (1) | DE102015011126A1 (en) |
Cited By (1)
| 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 |
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| DE102010034054A1 (en) | 2010-08-11 | 2012-02-16 | Schott Ag | Laser-based white light source |
| DE102012002232A1 (en) | 2012-02-04 | 2012-09-20 | Daimler Ag | Illumination device i.e. headlight, for use in of vehicle for e.g. danger light function, has mirror system diverting laser light beams on other mirror system such that reflected laser light beams appear white |
| WO2013051623A1 (en) * | 2011-10-03 | 2013-04-11 | シャープ株式会社 | Light-emitting body, illumination device, and headlight |
| US20140321151A1 (en) * | 2011-11-18 | 2014-10-30 | Sharp Kabushiki Kaisha | Illumination apparatus, vehicle headlamp, and downlight |
| WO2014203479A1 (en) * | 2013-06-21 | 2014-12-24 | パナソニックＩｐマネジメント株式会社 | Light source, and vehicle headlamp equipped with light source |
| EP2829790A2 (en) * | 2013-07-23 | 2015-01-28 | Valeo Vision | Lighting system associating white light and light of a different colour |
-
2015
- 2015-08-26 DE DE102015011126.4A patent/DE102015011126A1/en not_active Withdrawn
-
2016
- 2016-06-29 EP EP16001457.7A patent/EP3135988B1/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010034054A1 (en) | 2010-08-11 | 2012-02-16 | Schott Ag | Laser-based white light source |
| WO2013051623A1 (en) * | 2011-10-03 | 2013-04-11 | シャープ株式会社 | Light-emitting body, illumination device, and headlight |
| US20140321151A1 (en) * | 2011-11-18 | 2014-10-30 | Sharp Kabushiki Kaisha | Illumination apparatus, vehicle headlamp, and downlight |
| DE102012002232A1 (en) | 2012-02-04 | 2012-09-20 | Daimler Ag | Illumination device i.e. headlight, for use in of vehicle for e.g. danger light function, has mirror system diverting laser light beams on other mirror system such that reflected laser light beams appear white |
| WO2014203479A1 (en) * | 2013-06-21 | 2014-12-24 | パナソニックＩｐマネジメント株式会社 | Light source, and vehicle headlamp equipped with light source |
| EP2829790A2 (en) * | 2013-07-23 | 2015-01-28 | Valeo Vision | Lighting system associating white light and light of a different colour |
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| US11402080B2 (en) * | 2019-05-23 | 2022-08-02 | Korrus, Inc. | Dynamic illumination using a coherent light source |
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| EP3135988B1 (en) | 2019-03-13 |
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