EP3184883B1 - Light module for a lighting device of a motor vehicle - Google Patents

Light module for a lighting device of a motor vehicle Download PDF

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Publication number
EP3184883B1
EP3184883B1 EP16204284.0A EP16204284A EP3184883B1 EP 3184883 B1 EP3184883 B1 EP 3184883B1 EP 16204284 A EP16204284 A EP 16204284A EP 3184883 B1 EP3184883 B1 EP 3184883B1
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EP
European Patent Office
Prior art keywords
light
module
photoluminescent element
guide body
laser light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16204284.0A
Other languages
German (de)
French (fr)
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EP3184883A1 (en
Inventor
Joachim Knittel
Martin Licht
Christian Buchberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Automotive Lighting Reutlingen Germany GmbH
Original Assignee
Automotive Lighting Reutlingen GmbH
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Filing date
Publication date
Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP3184883A1 publication Critical patent/EP3184883A1/en
Application granted granted Critical
Publication of EP3184883B1 publication Critical patent/EP3184883B1/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
    • F21S41/16—Laser light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/70—Prevention of harmful light leakage
    • 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
    • F21S41/13—Ultraviolet light; Infrared light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the invention relates to a light module for a lighting device of a motor vehicle.
  • Motor vehicle headlights that have a laser light source are generally known. In this way, motor vehicle headlights can be created which, with high illuminance levels, small geometric dimensions and high efficiency, achieve beam lengths of over 500 m.
  • projection optics have a large number of transmitting and / or reflecting individual components.
  • An example is the DE 10 2013 200 521 A1 referred.
  • a motor vehicle lighting device which comprises a radiation-inhibiting means which is designed and arranged in such a way that the transformation into the radiation-light distribution can be suppressed for those light beams which run in a primary solid angle range around a primary emission direction.
  • the DE 10 2012 220 481 A1 discloses a light module for motor vehicle headlights which comprises at least one detection device which is designed and arranged in such a way that it can be detected when a radiation intensity of light beams which run in the beam path after a photoluminescent element in a primary spatial angle range around a primary beam axis exceeds a safety limit value.
  • the DE 10 2012 013 841 A1 also discloses a vehicle headlight according to the prior art.
  • the object of the invention is therefore to reduce the dimensions of a light module with a laser light source, the emission of potentially dangerous laser light being prevented simply and compactly.
  • a light module for a lighting device of a motor vehicle for emitting a radiation light distribution is proposed.
  • a laser light source and a primary optics device are designed to generate a primary light bundle comprising laser light.
  • a photoluminescent element is arranged in such a way that the primary light bundle strikes the photoluminescent element and that a secondary light bundle comprising white light is generated from the incident primary light bundle, which can contain laser light.
  • a one-piece secondary optics device consists of a light guide body arranged in the beam path after the photoluminescent element.
  • the light guide body comprises a light coupling section, which at least in sections comprises a reflective layer in order to allow at least a first part of the secondary light bundle to enter the light guide body by means of the light coupling section and to reflect a second part of the secondary light bundle as well as unconverted primary radiation back onto the photoluminescent element.
  • the light guide body comprises a light coupling section in order to emit the radiation light distribution.
  • the light guide body further comprises a reflector section in order to deflect light entering the light guide body through the light coupling section by means of the reflector section to the light coupling section.
  • the reflector section and the light coupling section are matched to one another such that a focal point of at least a part of the reflector section is located outside the secondary optics device in the region of the photoluminescent element.
  • the photoluminescent element is therefore also arranged outside and at a distance from the light guide body, as a result of which both the laser light source and the primary optics device for generating the primary light bundle can be arranged outside the light guide body. There are also advantages for cooling the photoluminescent element.
  • the light coupling section is spherical, and the associated center of curvature is on or within the photoluminescent element. In this way, it is advantageously achieved that light is coupled into the light guide body without substantial refraction.
  • a first focusing area of the primary optics arrangement in particular the focal point of the primary optics arrangement
  • a second focusing area of the reflector section in particular the focal point of the reflector section
  • the center of curvature of the light coupling section advantageously coincide or overlap. So the imaging of the white light generated by the photoluminescent element improved in the light distribution
  • the light coupling section is arranged and configured such that incident white light is essentially transmitted and light with a wavelength of the laser light is essentially reflected back onto the photoluminescent element. This is achieved by an appropriate coating on the light coupling surface. This advantageously prevents dangerous laser radiation from escaping.
  • the efficiency of the light module is improved since laser light that is emitted by the photoluminescent element is deflected back onto the latter and is used to generate further white light.
  • This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light.
  • ultraviolet light which is emitted, for example, by a laser light source and / or deflected by the photoluminescent element, is prevented from entering the light guide body, which improves laser safety.
  • the light-guiding body is arranged and designed such that light with a wavelength of the laser light is essentially absorbed between the light coupling-in section and the light-coupling-out section and white light is essentially transmitted.
  • This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light. In this way, ultraviolet light is prevented from passing through the light guide body.
  • the light outcoupling section is arranged and configured such that incident white light is essentially transmitted and light with the wavelength of the laser light is essentially reflected back into the light-guiding body.
  • incident white light is essentially transmitted and light with the wavelength of the laser light is essentially reflected back into the light-guiding body.
  • no laser light emerges from the light module.
  • This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light.
  • the passive safety can be additionally increased by the back-reflected light.
  • a mirror surface facing the light coupling section directly adjoins a surface of the photoluminescent element.
  • a light-dark boundary can be represented in the radiation distribution, which has a high light intensity up to its edge.
  • the transition between the mirror surface and the surface is formed abruptly and at least in sections in a straight line.
  • This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light.
  • the efficiency is increased, since the light coupling section which is designed to be reflective with respect to the laser light directs the laser light reflected from the mirror surface back onto the photoluminescent element in order to generate white light
  • the light coupling section and / or the light coupling section comprises an anti-reflective coating.
  • This embodiment is particularly suitable for laser light sources that generate blue laser light.
  • One embodiment relates to a light module arrangement comprising a first light module and a second light module, the two light modules having a common light guide body.
  • One embodiment relates to a method for producing the light module, wherein the primary light beam is directed onto the photoluminescent element, an actual position of a light spot of the laser light on the surface of the photoluminescent element is determined, and a difference between the determined actual position of the light spot and one The target position of the light spot is determined.
  • a further development of the method relates to an adjustment of the photoluminescent element and the secondary optics device as a function of the determined difference from one another in such a way that the actual position of the light spot essentially corresponds to the desired position of the light spot.
  • a lighting device for motor vehicles is designated in its entirety by reference number 101.
  • the lighting device 101 is designed as a motor vehicle headlight.
  • the lighting device 101 can also be designed as a lamp or the like, which is arranged on the rear or on the side of the motor vehicle.
  • the headlight 101 comprises a housing 102, which is preferably made of plastic is made.
  • the headlight housing 102 has a light exit opening which is closed by a transparent cover plate 104.
  • the cover plate 104 is made of colorless plastic or glass.
  • the disk 104 can be designed as a so-called clear disk without optically active profiles (for example prisms).
  • the pane 104 can be provided, at least in regions, with optically active profiles, which in particular cause the light passing through to be scattered in the horizontal direction.
  • two light modules 105, 106 are arranged inside the headlight housing 102.
  • the light modules 105, 106 are arranged to be fixed or movable relative to the housing 102. By moving the light modules 105, 106 relative to the housing 102 in the horizontal direction, for example, a dynamic cornering light function can be implemented.
  • the light modules 105, 106 are for generating a desired light distribution, for example a low beam, a high beam, a city light, a highway light, a motorway light, a fog light, a static or dynamic cornering light or any other static or adaptive Light distribution trained.
  • the light modules 105, 106 generate the desired light function either alone or in combination with one another by using the light module 105; 107 delivered partial light distributions can be superimposed to the desired total light distribution.
  • the light modules 105, 106 can be designed as reflection modules and / or as projection modules. Of course, more or less than the two light modules 105, 106 shown can also be provided in the headlight housing 102.
  • Figure 2a shows the light module 105 in a schematic sectional view.
  • the statements relating to the light module 105 can also be transferred to the light module 106.
  • the light module 105 comprises a laser light source 2, a primary optics device 4, a photoluminescent element 6 and a one-piece secondary optics device 8.
  • the one-piece secondary optics device 8 comprises a light guide body 10 which is at least partially delimited by a light coupling section 12 and a light coupling section 14.
  • a reflector section 16 is arranged in the beam path between the light coupling section 12 and the light coupling section 14.
  • the light guide body 10 is made of a white light-transmitting material such as plastic or glass.
  • the laser light source 2 generates ultraviolet laser light which, after passing through the primary optics device 4, strikes the photoluminescent element 6 in a substantially focused manner as the first light bundle 20.
  • the primary optics device 4 can be designed as transmission optics and / or reflection optics.
  • the first light bundle 20 is also referred to as the primary light bundle.
  • the photoluminescent element 6 is mirrored on the back and generates a second light beam 22, which can also be referred to as a secondary light beam.
  • the primary light bundle 20 preferably strikes a surface 26 of the photoluminescent element 6 at a focal point 24 of the primary optics device 4. In particular, when the primary light bundle 20 strikes the photoluminescent element 6 obliquely, part of the laser light can strike the surface 26 of the photoluminescent element 6 in Direction of the light coupling section 12 are reflected.
  • a number of two to four laser light sources 2 with corresponding primary optics devices 4 can be arranged in such a way that they direct their primary light bundles 20 onto a common photoluminescent element 6.
  • the secondary light beam 22 emitted by the photoluminescent element 6 into a half space strikes the light coupling section 12, through which at least part of the secondary light beam 22 enters the light guide body 10 as a third light beam 28.
  • the light coupling section 12 is spherical, the center of curvature of which lies in the focal point 24 on the surface 26.
  • the light coupling section 12 comprises a reflective coating 25, which essentially reflects incident ultraviolet light. Accordingly, the ultraviolet light striking the light coupling section 12 from the photoluminescent element 6 is radiated back onto the photoluminescent element 6.
  • White light passes through the reflective coating 25 and enters the light guide body 10.
  • the light guide body 10 comprises the spherically designed light coupling section 12 and a parabolically designed reflector section 16.
  • the reflector section 16 can be formed, for example, by a reflective coating or by an interface of the light guide body 10, at which total reflection occurs.
  • the primary optics device 4 Due to the spherical configuration of the light coupling section 12, light rays of the secondary light beam 22 experience essentially no or only one low refraction.
  • the primary optics device 4, the light coupling section 12 and the reflector section 16 are matched to one another and arranged in such a way that the focal point 24 of the primary optics device 4 coincides with the focal point of the reflector section 16 and the center of curvature of the light coupling section 12, or at least the corresponding focusing areas overlap.
  • the reflector section 16 converts the third light beam 28 into a fourth light beam 30.
  • the fourth light bundle 30 comprises collimated light, which is directed onto the light output section 14.
  • the light decoupling section 14 comprises, for example, collecting and scattering sections adjoining one another in a yz plane in order to convert the fourth light bundle 30 into an emission light distribution 32 or a high beam distribution.
  • the light decoupling section 14 is in particular designed to generate a low beam distribution.
  • the light decoupling section 14 can also be configured differently with regard to its shape.
  • the light decoupling section 14 measures, for example, between 20 and 40 mm in the z direction and between 15 and 25 mm in the y direction, with which compact light decoupling section 14 can be arranged next to one another and thus lead to a compact headlight.
  • the laser light source 2 emits ultraviolet laser light.
  • the photoluminescent element 6 is designed such that ultraviolet laser light striking the photoluminescent element 6 is converted at least in part into white light and as part of the secondary light bundle 22 is emitted.
  • the laser light source 2, which emits ultraviolet laser light and is directed onto the photoluminescent element 6, has the advantage that the white light generated by the photoluminescent element 6 does not have to contain any portions of scattered laser light in order to add white light in the superposition of all contributions receive. It is thus possible to filter out the scattered ultraviolet laser light in the beam path.
  • ultraviolet laser light as part of the secondary light bundle 22 is radiated into a space 34 between the photoluminescent element 6 and the light coupling section 12.
  • the light coupling section 12 comprises a dichroic layer, which transmits white light from the secondary light bundle 22 into the light guide body 10 and essentially reflects ultraviolet laser light back into the space 34 onto the photoluminescent element 6.
  • the light guide body 10 can be made of a material that essentially absorbs ultraviolet light in the beam path and essentially does not absorb white light in the beam path, but rather transmits it as far as the light output section 14.
  • the light decoupling section 14 can also be made dichroic, so that the white light guided through the light guide body 10 is essentially transmitted and ultraviolet light is essentially reflected back into the light guide body 10.
  • the first embodiment can also be provided without dichroic coatings in the area of light coupling section 12 and / or light coupling section 14.
  • the light coupling section 12 is designed in a dichroic manner such that more than 97% of the white light is transmitted and over 90% of the ultraviolet light is reflected.
  • the light outcoupling section 14 is designed in a dichroic manner such that more than 97% of the white light is transmitted and over 90% of the ultraviolet light is reflected.
  • Figure 2b shows a second embodiment of the light module 105, in which the laser light source 2 emits essentially blue laser light.
  • the photoluminescent element 6 converts blue laser light into scattered laser light and luminescent light, which is emitted by the photoluminescent element 6 in the form of white mixed light.
  • the light coupling section 12 comprises sections of a reflective layer 27 for reflecting incident blue laser light back onto the photoluminescent element 6. Accordingly, an unused but potentially dangerous part of the blue laser light can be radiated back onto the photoluminescent element 6 and used to generate white light. Even if blue laser light that is not scattered strikes, the reflective layer 27 ensures that it is not coupled into the light guide body 10.
  • the light coupling section 12 has a window 29 without a reflective layer 27 in order to introduce as large a part of the secondary light bundle 22 as possible with luminescent light and scattered laser light into the light guide body 10.
  • the reflective layer 27 is therefore interrupted in the region of the window 29.
  • scattered primary light ie scattered laser light Generation of white light with needed.
  • the light guide body 10 is essentially designed to be transmitting for the mixed light emitted by the photoluminescent element 6.
  • the light decoupling section 14 comprises an antireflection layer.
  • the light module 105 can be used in the Figures 2a and 2 B have a light guide body 10, which is additionally assigned to a further light module 106 as a common injection molded part.
  • Figure 3 shows a schematic flow diagram 40 for producing the light module 105, 106.
  • a first step 42 laser light from the laser light source 2 is directed through the primary optics device 4 onto the photoluminescent element 6.
  • an actual position of the light spot on the surface 26 of the photoluminescent element 6 is determined. This determination of the actual position of the light spot is carried out by recording with a camera.
  • a difference is determined between the determined actual position of the light spot and a target position of the light spot.
  • the photoluminescent element 6 and the secondary optics device 8 are adjusted relative to one another as a function of the difference determined, so that the actual position of the light spot essentially corresponds to the desired position of the light spot.
  • the light reflected back from the light coupling section 12 can also be used in this way of the wavelength of the laser light can be focused on the focal point 24 of the primary optics device 4 on the photoluminescent element 6, so as to increase the efficiency of the light module 105 with regard to the generation of white light.
  • a photoluminescent element 6 which has already been fixed to the secondary optics device 8 can be checked for its correct adjustment for quality assurance.
  • the light module 105 can be rejected if the difference between the actual position of the light spot and the desired position of the light spot is too great.
  • Figure 4 shows a schematic view of part of the light-guiding body 10 in a sectional view, the reflector section 16 being of faceted design.
  • the reflector section 16 thus has facet elements 16a, 16b, 16b which are assigned to the one photoluminescent element 6.
  • the centrally arranged facet element 16b can thus be used for central illumination of the roadway.
  • the facet elements 16a and 16b can be provided, for example, for side illumination.
  • Figure 5 shows in schematic form a top view of the backside mirrored photoluminescent element 6.
  • the surface 26, which is provided for emitting the white light from the photoluminescent element 6, is directly adjoined by a mirror surface 50 facing the light coupling section 12. An edge 52 thus results between the surface 26 and the mirror surface 50.
  • the primary light beam 20 is in such a way in a focusing area 54, which in particular comprises the focal point 24 and can be designated as a light spot Focuses photoluminescent element 6 so that the focusing area 54 lies partly on the mirror surface 50 and partly on the surface 26.
  • a focusing area 54 selected in this way, the edge 52 is advantageously imaged in the radiation light distribution 32 in such a way that there is a large difference in light intensity. For example, the light-dark boundary can be displayed better in this way.
  • laser light is reflected from the mirror surface 50 onto the light coupling section 12 in accordance with the light beam 56 shown as an example.
  • the mirror surface 50 can be arranged, for example, as a coating on the surface 26 of the photoluminescent element 6.
  • the light beam 56 with reflected laser light is reflected by the light coupling section 12, which is designed to be reflective for laser light, as an example, reflected by a light beam 58 back onto the photoluminescent element 6 into a feedback region 60 on the surface 26.
  • the laser light reflected back into the feedback region 60 from the light coupling section 12 can thus be used for further white light generation and thus for increasing the efficiency.
  • a strongly scattering and / or absorbing absorption surface facing the light coupling section 12 is arranged in such a way that it is attached to the surface 26 of the photoluminescent element 6 in order to likewise form an edge between the surface 50 and the absorption surface, in order to achieve, for example, a high light intensity in the radiation light distribution 32 up to the edge of the light-dark boundary.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs.The invention relates to a light module for a lighting device of a motor vehicle.

Kraftfahrzeugscheinwerfer, die eine Laserlichtquelle aufweisen sind allgemein bekannt. So können Kraftfahrzeugscheinwerfer geschaffen werden, die bei hohen Beleuchtungsstärken, geringen geometrischen Abmessungen und hoher Effizienz Leuchtweiten von über 500 m erreichen.Motor vehicle headlights that have a laser light source are generally known. In this way, motor vehicle headlights can be created which, with high illuminance levels, small geometric dimensions and high efficiency, achieve beam lengths of over 500 m.

Auch ist bekannt, dass eine Projektionsoptik eine Vielzahl von transmittierenden und/oder reflektierenden Einzelbauteilen aufweist. Beispielhaft wird auf die DE 10 2013 200 521 A1 verwiesen.It is also known that projection optics have a large number of transmitting and / or reflecting individual components. An example is the DE 10 2013 200 521 A1 referred.

Des Weiteren ist bekannt, dass beispielsweise bei einem Defekt eines eine Laserlichtquelle umfassenden Scheinwerfers Laserlicht mit hoher Intensität nach außen gelangen kann. Hierdurch entsteht eine Gefährdungssituation für andere Verkehrsteilnehmer. Um Unfälle durch austretendes Laserlicht zu verhindern, sind aktive und passive Sicherheitsvorrichtungen bekannt.Furthermore, it is known that, for example, if a headlight comprising a laser light source is defective, laser light can reach the outside with high intensity. This creates a dangerous situation for other road users. Active and passive safety devices are known to prevent accidents caused by emerging laser light.

So wird beispielsweise in der DE 10 2012 220 472 A1 eine KFZ-Beleuchtungsvorrichtung vorgeschlagen, die ein Abstrahlhemmungsmittel umfasst, welches derart ausgebildet und angeordnet ist, dass die Umformung in die Abstrahllichtverteilung für solche Lichtbündel unterdrückbar ist, welche in einem Primärraumwinkelbereich um eine Primärabstrahlrichtung verlaufen.For example, in the DE 10 2012 220 472 A1 proposed a motor vehicle lighting device which comprises a radiation-inhibiting means which is designed and arranged in such a way that the transformation into the radiation-light distribution can be suppressed for those light beams which run in a primary solid angle range around a primary emission direction.

Die DE 10 2012 220 481 A1 offenbart hingegen ein Lichtmodul für Kfz-Scheinwerfer, das wenigstens eine Detektionseinrichtung umfasst, welche derart ausgebildet und angeordnet ist, sodass detektierbar ist, wenn eine Strahlungsintensität von Lichtbündeln, welche im Strahlengang nach einem Photolumineszenzelement in einem Primärraumwinkelbereich um eine Primärstrahlachse verlaufen, einen Sicherheitsgrenzwert überschreitet. Die DE 10 2012 013 841 A1 offenbart auch einen Fahrzeugscheinwerfer gemäß dem Stand der Technik.The DE 10 2012 220 481 A1 on the other hand, discloses a light module for motor vehicle headlights which comprises at least one detection device which is designed and arranged in such a way that it can be detected when a radiation intensity of light beams which run in the beam path after a photoluminescent element in a primary spatial angle range around a primary beam axis exceeds a safety limit value. The DE 10 2012 013 841 A1 also discloses a vehicle headlight according to the prior art.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der Erfindung ist es somit, die Dimensionen eines Lichtmoduls mit einer Laserlichtquelle zu reduzieren, wobei die Abstrahlung von potentiell gefährlichem Laserlicht einfach und kompakt verhindert wird.The object of the invention is therefore to reduce the dimensions of a light module with a laser light source, the emission of potentially dangerous laser light being prevented simply and compactly.

Die der Erfindung zugrunde liegende Aufgabe wird durch ein Lichtmodul nach dem Anspruch 1 gelöst. VorteilhafteThe object on which the invention is based is achieved by a light module according to claim 1. Beneficial

Weiterbildungen sind in den Unteransprüchen angegeben und finden sich ferner in der nachfolgenden Beschreibung von Ausführungsbeispielen.Further developments are specified in the subclaims and can also be found in the following description of exemplary embodiments.

Es wird ein Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs zur Abstrahlung einer Abstrahllichtverteilung vorgeschlagen. Eine Laserlichtquelle und eine Primäroptikeinrichtung sind zur Erzeugung eines Primärlichtbündels umfassend Laserlicht ausgebildet. Ein Photolumineszenzelement ist derart angeordnet, dass das Primärlichtbündel auf das Photolumineszenzelement trifft, und dass aus dem auftreffenden Primärlichtbündel ein Sekundärlichtbündel umfassend weißes Licht erzeugt wird, welches aus Laserlicht enthalten kann. Eine einteilige Sekundäroptikeinrichtung besteht aus einem im Strahlengang nach dem Photolumineszenzelement angeordneten Lichtleitkörper. Der Lichtleitkörper umfasst einen Lichteinkoppelabschnitt, welcher zumindest abschnittsweise eine Reflexschicht umfasst, um zumindest einen ersten Teil des Sekundärlichtbündels mittels des Lichteinkoppelabschnitts in den Lichtleitkörper eintreten zu lassen und einen zweiten Teil des Sekundärlichtbündels sowie nicht umgewandelte Primärstrahlung zurück auf das Photolumineszenzelement zu reflektieren. Der Lichtleitkörper umfasst einen Lichtauskoppelabschnitt, um die Abstrahllichtverteilung abzustrahlen. Der Lichtleitkörper umfasst des Weiteren einen Reflektorabschnitt, um durch den Lichteinkoppelabschnitt in den Lichtleitkörper eintretendes Licht mittels des Reflektorabschnitts zu dem Lichtauskoppelabschnitt umzulenken. Diese Sekundäroptikeinrichtung ermöglicht einen kleinen und damit sehr kompakten Laserscheinwerfer, da die gesamte Projektionsoptikanordnung einteilig gefertigt und so im Scheinwerfer anordenbar ist. Mithin entfallen beispielsweise Befestigungselemente für den Reflektorabschnitt. Vorteilhaft kann so außerdem mittels der Sekundäroptikeinrichtung eine blendenfreie Projektionsoptikanordnung geschaffen werden.A light module for a lighting device of a motor vehicle for emitting a radiation light distribution is proposed. A laser light source and a primary optics device are designed to generate a primary light bundle comprising laser light. A photoluminescent element is arranged in such a way that the primary light bundle strikes the photoluminescent element and that a secondary light bundle comprising white light is generated from the incident primary light bundle, which can contain laser light. A one-piece secondary optics device consists of a light guide body arranged in the beam path after the photoluminescent element. The light guide body comprises a light coupling section, which at least in sections comprises a reflective layer in order to allow at least a first part of the secondary light bundle to enter the light guide body by means of the light coupling section and to reflect a second part of the secondary light bundle as well as unconverted primary radiation back onto the photoluminescent element. The light guide body comprises a light coupling section in order to emit the radiation light distribution. The light guide body further comprises a reflector section in order to deflect light entering the light guide body through the light coupling section by means of the reflector section to the light coupling section. This secondary optics device enables a small and thus very compact laser headlight, since the entire projection optics arrangement is made in one piece and can be arranged in the headlight. For example, there are no fastening elements for the reflector section. In this way, a diaphragm-free projection optical arrangement can advantageously also be created by means of the secondary optics device.

In einer vorteilhaften Ausführungsform sind der Reflektorabschnitt und der Lichteinkoppelabschnitt derart aufeinander abgestimmt, sodass ein Brennpunkt zumindest eines Teiles des Reflektorabschnitts sich außerhalb der Sekundäroptikeinrichtung im Bereich des Photolumineszenzelements befindet. Mithin ist ebenso das Photolumineszenzelement außerhalb und beabstandet zu dem Lichtleitkörper angeordnet, wodurch sich sowohl die Laserlichtquelle als auch die Primäroptikeinrichtung zur Erzeugung des Primärlichtbündel außerhalb des Lichtleitkörpers anordnen lassen. Darüber hinaus ergeben sich Vorteile für die Kühlung des Photolumineszenzelements.In an advantageous embodiment, the reflector section and the light coupling section are matched to one another such that a focal point of at least a part of the reflector section is located outside the secondary optics device in the region of the photoluminescent element. The photoluminescent element is therefore also arranged outside and at a distance from the light guide body, as a result of which both the laser light source and the primary optics device for generating the primary light bundle can be arranged outside the light guide body. There are also advantages for cooling the photoluminescent element.

In einer vorteilhaften Ausführungsform ist der Lichteinkoppelabschnitt sphärisch ausgebildet, und der zugehörige Krümmungsmittelpunkt befindet sich auf oder innerhalb des Photolumineszenzelements. Hierdurch wird vorteilhaft erreicht, dass eine Einkopplung von Licht in den Lichtleitkörper ohne eine wesentliche Brechung erfolgt.In an advantageous embodiment, the light coupling section is spherical, and the associated center of curvature is on or within the photoluminescent element. In this way, it is advantageously achieved that light is coupled into the light guide body without substantial refraction.

Vorteilhaft fallen in einer Weiterbildung ein erster Fokussierungsbereich der Primäroptikanordnung, insbesondere der Brennpunkt der Primäroptikanordnung, ein zweiter Fokussierungsbereich des Reflektorabschnitts, insbesondere der Brennpunkt des Reflektorabschnitts, und der Krümmungsmittelpunkt des Lichteinkoppelabschnitts zusammen oder überlappen sich. So wird die Abbildung des weißen Lichts, das durch das Photolumineszenzelement erzeugt wird, in der Abstrahllichtverteilung verbessertIn a further development, a first focusing area of the primary optics arrangement, in particular the focal point of the primary optics arrangement, a second focusing area of the reflector section, in particular the focal point of the reflector section, and the center of curvature of the light coupling section advantageously coincide or overlap. So the imaging of the white light generated by the photoluminescent element improved in the light distribution

In einer vorteilhaften Ausführungsform ist der Lichteinkoppelabschnitt derart angeordnet und ausgestaltet, sodass auftreffendes weißes Licht im Wesentlichen transmittiert wird und Licht mit einer Wellenlänge des Laserlichts im Wesentlichen auf das Photolumineszenzelement rückreflektiert wird. Dies wird durch eine entsprechende Beschichtung auf der Lichteinkoppelfläche erreicht. Vorteilhaft wird hierdurch der Austritt von gefährlicher Laserstrahlung verhindert. Darüber hinaus wird die Effizienz des Lichtmoduls verbessert, da Laserlicht, das von dem Photolumineszenzelement abgestrahlt wird auf dieses zurückgelenkt und zur Erzeugung weiteren Weißlichts genutzt wird. Diese Ausführungsform ist besonders bei einer Verwendung einer Laserlichtquelle vorteilhaft, die ultraviolettes Laserlicht erzeugt. So wird ultraviolettes Licht, das beispielsweise von einer Laserlichtquelle abgestrahlt und/oder von dem Photolumineszenzelement umgelenkt wird, daran gehindert, in den Lichtleitkörper einzutreten, was die Lasersicherheit verbessert.In an advantageous embodiment, the light coupling section is arranged and configured such that incident white light is essentially transmitted and light with a wavelength of the laser light is essentially reflected back onto the photoluminescent element. This is achieved by an appropriate coating on the light coupling surface. This advantageously prevents dangerous laser radiation from escaping. In addition, the efficiency of the light module is improved since laser light that is emitted by the photoluminescent element is deflected back onto the latter and is used to generate further white light. This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light. Thus, ultraviolet light, which is emitted, for example, by a laser light source and / or deflected by the photoluminescent element, is prevented from entering the light guide body, which improves laser safety.

In einer vorteilhaften Ausführungsform ist der Lichtleitkörper derart angeordnet und ausgestaltet, sodass zwischen dem Lichteinkoppelabschnitt und dem Lichtauskoppelabschnitt Licht mit einer Wellenlänge des Laserlichts im Wesentlichen absorbiert wird und weißes Licht im Wesentlichen transmittiert wird. Diese Ausführungsform ist besonders bei einer Verwendung einer Laserlichtquelle vorteilhaft, die ultraviolettes Laserlicht erzeugt. So wird ultraviolettes Licht an einem Durchtreten des Lichtleitkörpers gehindert. Mithin wird ein passives Sicherheitskonzept für Laserlichtquellen, die ultraviolettes Laserlicht ausstrahlen, geschaffen, das gleichermaßen die Schaffung kleinerer Scheinwerfer erlaubt. Mithin können aktive Sicherheitsvorrichtungen zur Erhöhung der Betriebssicherheit eines Kraftfahrzeugs Scheinwerfers mit einer Laserlichtquelle entfallen.In an advantageous embodiment, the light-guiding body is arranged and designed such that light with a wavelength of the laser light is essentially absorbed between the light coupling-in section and the light-coupling-out section and white light is essentially transmitted. This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light. In this way, ultraviolet light is prevented from passing through the light guide body. This creates a passive safety concept for laser light sources that emit ultraviolet laser light equally allows the creation of smaller headlights. Active safety devices for increasing the operational safety of a motor vehicle headlights with a laser light source can therefore be dispensed with.

In einer vorteilhaften Ausführungsform ist der Lichtauskoppelabschnitt derart angeordnet und ausgestaltet, sodass auftreffendes weißes Licht im Wesentlichen transmittiert wird und Licht mit der Wellenlänge des Laserlichts im Wesentlichen in den Lichtleitkörper rückreflektiert wird. So tritt bevorzugt kein Laserlicht aus dem Lichtmodul aus. Diese Ausführungsform ist besonders bei einer Verwendung einer Laserlichtquelle vorteilhaft, die ultraviolettes Laserlicht erzeugt. Insbesondere in Verbindung mit einem Lichtleitkörper, der Licht mit einer Wellenlänge des Laserlichts im Wesentlichen absorbiert, kann durch das rückreflektierte Licht die passive Sicherheit zusätzlich erhöht werden.In an advantageous embodiment, the light outcoupling section is arranged and configured such that incident white light is essentially transmitted and light with the wavelength of the laser light is essentially reflected back into the light-guiding body. Thus, preferably no laser light emerges from the light module. This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light. In particular in connection with a light-guiding body which essentially absorbs light with a wavelength of the laser light, the passive safety can be additionally increased by the back-reflected light.

In einer vorteilhaften Ausführungsform schließt sich eine dem Lichteinkoppelabschnitt zugewandte Spiegelfläche an eine Oberfläche des Photolumineszenzelements unmittelbar an. Hierdurch kann beispielsweise eine Hell-Dunkel-Grenze in der Abstrahllichtverteilung abgebildet werden, die bis zu ihrem Rand eine hohe Lichtintensität aufweist. Hierzu ist der Übergang zwischen der der Spiegelfläche und der Oberfläche abrupt und zumindest abschnittsweise geradlinig ausgebildet. Diese Ausführungsform ist besonders bei einer Verwendung einer Laserlichtquelle vorteilhaft, die ultraviolettes Laserlicht erzeugt. Insbesondere wird die Effizienz erhöht, da der bezüglich des Laserlichts reflektierend ausgebildete Lichteinkoppelabschnitt das von der Spiegelfläche reflektierte Laserlicht wieder auf das Photolumineszenzelement lenkt, um weißes Licht zu erzeugen In einer vorteilhaften Ausführungsform umfasst der Lichteinkoppelabschnitt und/oder der Lichtauskoppelabschnitt eine Antireflex-Beschichtung. Diese Ausführungsform ist insbesondere für Laserlichtquellen geeignet, die blaues Laserlicht erzeugen. So durchtritt Licht mit einer Wellenlänge des Laserlichts, insbesondere vom Photolumineszenzelement erzeugtes gestreutes Laserlicht den Lichtleitkörper. Somit ist auch gestreutes Laserlicht in der Abstrahllichtverteilung enthalten.In an advantageous embodiment, a mirror surface facing the light coupling section directly adjoins a surface of the photoluminescent element. In this way, for example, a light-dark boundary can be represented in the radiation distribution, which has a high light intensity up to its edge. For this purpose, the transition between the mirror surface and the surface is formed abruptly and at least in sections in a straight line. This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light. In particular, the efficiency is increased, since the light coupling section which is designed to be reflective with respect to the laser light directs the laser light reflected from the mirror surface back onto the photoluminescent element in order to generate white light In an advantageous embodiment, the light coupling section and / or the light coupling section comprises an anti-reflective coating. This embodiment is particularly suitable for laser light sources that generate blue laser light. Thus light with a wavelength of the laser light, in particular scattered laser light generated by the photoluminescent element, passes through the light guide body. Scattered laser light is thus also included in the radiation distribution.

Eine Ausführungsform betrifft eine Lichtmodulanordnung umfassend ein erstes Lichtmodul und ein zweites Lichtmodul, wobei die beiden Lichtmodule einen gemeinsamen Lichtleitkörper aufweisen. Vorteilhaft kann so eine weitere Verkleinerung des Scheinwerfers bei gleichzeitiger Kostenreduktion erreicht werden.One embodiment relates to a light module arrangement comprising a first light module and a second light module, the two light modules having a common light guide body. A further reduction in the size of the headlamp while at the same time reducing costs can advantageously be achieved in this way.

Eine Ausführungsform betrifft ein Verfahren zum Herstellen des Lichtmoduls, wobei das Primärlichtbündel auf das Photolumineszenzelement gerichtet wird, wobei eine Ist-Lage eines Lichtflecks des Laserlichts auf der Oberfläche des Photolumineszenzelements ermittelt wird, und wobei ein Unterschied zwischen der ermittelten Ist-Lage des Lichtflecks und einer Soll-Lage des Lichtflecks ermittelt wird.One embodiment relates to a method for producing the light module, wherein the primary light beam is directed onto the photoluminescent element, an actual position of a light spot of the laser light on the surface of the photoluminescent element is determined, and a difference between the determined actual position of the light spot and one The target position of the light spot is determined.

Eine Weiterbildung des Verfahrens betrifft eine Justierung des Photolumineszenzelements und der Sekundäroptikeinrichtung in Abhängigkeit von dem ermittelten Unterschied derart zueinander, sodass die Ist-Lage des Lichtflecks im Wesentlichen mit der Soll-Lage des Lichtflecks übereinstimmt.A further development of the method relates to an adjustment of the photoluminescent element and the secondary optics device as a function of the determined difference from one another in such a way that the actual position of the light spot essentially corresponds to the desired position of the light spot.

Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in den Figuren der Zeichnung dargestellt sind. Für funktionsäquivalente Größen und Merkmale werden in allen Figuren auch bei unterschiedlichen Ausführungsformen die gleichen Bezugszeichen verwendet.Other features, applications and advantages of Invention result from the following description of exemplary embodiments of the invention, which are shown in the figures of the drawing. The same reference numerals are used in all figures for functionally equivalent sizes and features, even in different embodiments.

Nachfolgend werden beispielhafte Ausführungsformen der Erfindung unter Bezugnahme auf die Zeichnung erläutert. In der Zeichnung zeigen:

Figur 1
eine Beleuchtungseinrichtung für Kraftfahrzeuge;
Figur 2a und 2b
eine schematische Schnittansicht eines Lichtmoduls;
Figur 3
ein schematisches Ablaufdiagramm;
Figur 4
in schematischer Form einen Teil eines Lichtleitkörpers; und
Figur 5
in schematischer Form eine Draufsicht auf ein Photolumineszenzelement.
Exemplary embodiments of the invention are explained below with reference to the drawing. The drawing shows:
Figure 1
a lighting device for motor vehicles;
Figure 2a and 2b
a schematic sectional view of a light module;
Figure 3
a schematic flow diagram;
Figure 4
in schematic form part of a light guide body; and
Figure 5
in schematic form a top view of a photoluminescent element.

In Figur 1 ist eine Beleuchtungseinrichtung für Kraftfahrzeuge in ihrer Gesamtheit mit dem Bezugszeichen 101 bezeichnet. Die Beleuchtungseinrichtung 101 ist in dem dargestellten Ausführungsbeispiel als ein Kraftfahrzeugscheinwerfer ausgebildet. Selbstverständlich kann die Beleuchtungseinrichtung 101 auch als eine Leuchte oder ähnliches, die am Heck oder seitlich am Kraftfahrzeug angeordnet ist, ausgebildet sein. Der Scheinwerfer 101 umfasst ein Gehäuse 102, das vorzugsweise aus Kunststoff gefertigt ist. In einer Lichtaustrittsrichtung 103 weist das Scheinwerfergehäuse 102 eine Lichtaustrittsöffnung auf, die durch eine transparente Abdeckscheibe 104 verschlossen ist. Die Abdeckscheibe 104 ist aus farblosem Kunststoff oder Glas gefertigt. Die Scheibe 104 kann ohne optisch wirksame Profile (zum Beispiel Prismen) als sogenannte klare Scheibe ausgebildet sein. Alternativ kann die Scheibe 104 zumindest bereichsweise mit optisch wirksamen Profilen, die insbesondere eine Streuung des hindurch tretenden Lichts in horizontaler Richtung bewirken, versehen sein.In Figure 1 A lighting device for motor vehicles is designated in its entirety by reference number 101. In the exemplary embodiment shown, the lighting device 101 is designed as a motor vehicle headlight. Of course, the lighting device 101 can also be designed as a lamp or the like, which is arranged on the rear or on the side of the motor vehicle. The headlight 101 comprises a housing 102, which is preferably made of plastic is made. In a light exit direction 103, the headlight housing 102 has a light exit opening which is closed by a transparent cover plate 104. The cover plate 104 is made of colorless plastic or glass. The disk 104 can be designed as a so-called clear disk without optically active profiles (for example prisms). As an alternative, the pane 104 can be provided, at least in regions, with optically active profiles, which in particular cause the light passing through to be scattered in the horizontal direction.

Im Inneren des Scheinwerfergehäuses 102 sind in dem dargestellten Ausführungsbeispiel zwei Lichtmodule 105, 106 angeordnet. Die Lichtmodule 105, 106 sind fest oder relativ zu dem Gehäuse 102 bewegbar angeordnet. Durch eine Relativbewegung der Lichtmodule 105, 106 zum Gehäuse 102 in horizontaler Richtung kann beispielsweise eine dynamische Kurvenlichtfunktion realisiert werden. Die Lichtmodule 105, 106 sind zur Erzeugung einer gewünschten Lichtverteilung, beispielsweise einer Abblendlicht-, einer Fernlicht-, einer Stadtlicht-, einer Landstraßenlicht-, einer Autobahnlicht-, einer Nebellicht-, einer statischen oder dynamischen Kurvenlicht- oder einer beliebig anderen statischen oder adaptiven Lichtverteilung ausgebildet. Die Lichtmodule 105, 106 erzeugen die gewünschte Lichtfunktion entweder alleine oder in Kombination miteinander, indem die von jedem einzelnen Lichtmodul 105; 107 gelieferten Teillichtverteilungen zu der gewünschten Gesamtlichtverteilung überlagert werden. Die Lichtmodule 105, 106 können als Reflexionsmodule und/oder als Projektionsmodule ausgebildet sein. Selbstverständlich können in dem Scheinwerfergehäuse 102 auch mehr oder weniger als die dargestellten zwei Lichtmodule 105, 106 vorgesehen sein.In the illustrated embodiment, two light modules 105, 106 are arranged inside the headlight housing 102. The light modules 105, 106 are arranged to be fixed or movable relative to the housing 102. By moving the light modules 105, 106 relative to the housing 102 in the horizontal direction, for example, a dynamic cornering light function can be implemented. The light modules 105, 106 are for generating a desired light distribution, for example a low beam, a high beam, a city light, a highway light, a motorway light, a fog light, a static or dynamic cornering light or any other static or adaptive Light distribution trained. The light modules 105, 106 generate the desired light function either alone or in combination with one another by using the light module 105; 107 delivered partial light distributions can be superimposed to the desired total light distribution. The light modules 105, 106 can be designed as reflection modules and / or as projection modules. Of course, more or less than the two light modules 105, 106 shown can also be provided in the headlight housing 102.

Figur 2a zeigt in einer schematischen Schnittansicht das Lichtmodul 105. Selbstverständlich sind die Ausführungen zum Lichtmodul 105 auch auf das Lichtmodul 106 übertragbar. Das Lichtmodul 105 umfasst im Strahlengang eine Laserlichtquelle 2, eine Primäroptikeinrichtung 4, ein Photolumineszenzelement 6 und eine einteilige Sekundäroptikeinrichtung 8. Figure 2a shows the light module 105 in a schematic sectional view. Of course, the statements relating to the light module 105 can also be transferred to the light module 106. In the beam path, the light module 105 comprises a laser light source 2, a primary optics device 4, a photoluminescent element 6 and a one-piece secondary optics device 8.

Die einteilige Sekundäroptikeinrichtung 8 umfasst einen Lichtleitkörper 10, der von einem Lichteinkoppelabschnitt 12 und einem Lichtauskoppelabschnitt 14 zumindest teilweise begrenzt ist. Im Strahlengang zwischen dem Lichteinkoppelabschnitt 12 und dem Lichtauskoppelabschnitt 14 ist ein Reflektorabschnitt 16 angeordnet. Des Weiteren ist der Lichtleitkörper 10 aus einem weißes Licht transmittierenden Material wie beispielsweise Kunststoff oder Glas gefertigt.The one-piece secondary optics device 8 comprises a light guide body 10 which is at least partially delimited by a light coupling section 12 and a light coupling section 14. A reflector section 16 is arranged in the beam path between the light coupling section 12 and the light coupling section 14. Furthermore, the light guide body 10 is made of a white light-transmitting material such as plastic or glass.

Die Laserlichtquelle 2 erzeugt ultraviolettes Laserlicht, das nach einem Durchgang durch die Primäroptikeinrichtung 4 als erstes Lichtbündel 20 im Wesentlichen fokussiert auf das Photolumineszenzelement 6 trifft. Die Primäroptikeinrichtung 4 kann als Transmissionsoptik und/oder Reflexionsoptik ausgebildet sein. Das erste Lichtbündel 20 wird auch als Primärlichtbündel bezeichnet. Das Photolumineszenzelement 6 ist rückseitig verspiegelt und erzeugt ein zweites Lichtbündel 22, das auch als Sekundärlichtbündel bezeichenbar ist. Das Primärlichtbündel 20 trifft bevorzugt in einem Brennpunkt 24 der Primäroptikeinrichtung 4 auf eine Oberfläche 26 des Photolumineszenzelements 6. Insbesondere unter schrägem Lichteinfall des Primärlichtbündels 20 auf das Photolumineszenzelement 6 kann ein Teil des Laserlichts an der Oberfläche 26 des Photolumineszenzelements 6 in Richtung des Lichteinkoppelabschnitts 12 reflektiert werden.The laser light source 2 generates ultraviolet laser light which, after passing through the primary optics device 4, strikes the photoluminescent element 6 in a substantially focused manner as the first light bundle 20. The primary optics device 4 can be designed as transmission optics and / or reflection optics. The first light bundle 20 is also referred to as the primary light bundle. The photoluminescent element 6 is mirrored on the back and generates a second light beam 22, which can also be referred to as a secondary light beam. The primary light bundle 20 preferably strikes a surface 26 of the photoluminescent element 6 at a focal point 24 of the primary optics device 4. In particular, when the primary light bundle 20 strikes the photoluminescent element 6 obliquely, part of the laser light can strike the surface 26 of the photoluminescent element 6 in Direction of the light coupling section 12 are reflected.

Insbesondere kann eine Anzahl von zwei bis vier Laserlichtquellen 2 mit entsprechenden Primäroptikeinrichtungen 4 so angeordnet werden, dass diese ihre Primärlichtbündel 20 auf ein gemeinsames Photolumineszenzelement 6 richten.In particular, a number of two to four laser light sources 2 with corresponding primary optics devices 4 can be arranged in such a way that they direct their primary light bundles 20 onto a common photoluminescent element 6.

Das von dem Photolumineszenzelement 6 in einen Halbraum abgestrahlte Sekundärlichtbündel 22 trifft auf den Lichteinkoppelabschnitt 12, durch den zumindest ein Teil des Sekundärlichtbündels 22 in den Lichtleitkörper 10 als drittes Lichtbündel 28 eintritt. Der Lichteinkoppelabschnitt 12 ist sphärisch ausgebildet, wobei dessen Krümmungsmittelpunkt in dem Brennpunkt 24 auf der Oberfläche 26 liegt. Der Lichteinkoppelabschnitt 12 umfasst eine Reflex-Beschichtung 25, welche auftreffendes ultraviolettes Licht im Wesentlichen reflektiert. Mithin wird das von dem Photolumineszenzelement 6 auf den Lichteinkoppelabschnitt 12 treffende ultraviolette Licht zurück auf das Photolumineszenzelement 6 gestrahlt. Weißes Licht hingegen passiert die Reflex-Beschichtung 25 und tritt in den Lichtleitkörper 10 ein. Der Lichtleitkörper 10 umfasst den sphärisch ausgebildeten Lichteinkoppelabschnitt 12 sowie einen parabolisch ausgebildeten Reflektorabschnitt 16. Der Reflektorabschnitt 16 kann beispielsweise durch eine spiegelnde Beschichtung oder durch eine Grenzfläche des Lichtleitkörpers 10, an welcher Totalreflexion auftritt, ausgebildet sein.The secondary light beam 22 emitted by the photoluminescent element 6 into a half space strikes the light coupling section 12, through which at least part of the secondary light beam 22 enters the light guide body 10 as a third light beam 28. The light coupling section 12 is spherical, the center of curvature of which lies in the focal point 24 on the surface 26. The light coupling section 12 comprises a reflective coating 25, which essentially reflects incident ultraviolet light. Accordingly, the ultraviolet light striking the light coupling section 12 from the photoluminescent element 6 is radiated back onto the photoluminescent element 6. White light, on the other hand, passes through the reflective coating 25 and enters the light guide body 10. The light guide body 10 comprises the spherically designed light coupling section 12 and a parabolically designed reflector section 16. The reflector section 16 can be formed, for example, by a reflective coating or by an interface of the light guide body 10, at which total reflection occurs.

Durch die sphärische Ausbildung des Lichteinkoppelabschnitts 12 erfahren Lichtstrahlen des Sekundärlichtbündels 22 im Wesentlichen keine oder nur eine geringe Brechung. Die Primäroptikeinrichtung 4, der Lichteinkoppelabschnitt 12 und der Reflektorabschnitt 16 sind derart aufeinander abgestimmt und zueinander angeordnet, sodass der Brennpunkt 24 der Primäroptikeinrichtung 4 mit dem Brennpunkt des Reflektorabschnitts 16 und dem Krümmungsmittelpunkt des Lichteinkoppelabschnitt 12 zusammenfällt bzw. sich die entsprechenden Fokussierungsbereiche zumindest überschneiden.Due to the spherical configuration of the light coupling section 12, light rays of the secondary light beam 22 experience essentially no or only one low refraction. The primary optics device 4, the light coupling section 12 and the reflector section 16 are matched to one another and arranged in such a way that the focal point 24 of the primary optics device 4 coincides with the focal point of the reflector section 16 and the center of curvature of the light coupling section 12, or at least the corresponding focusing areas overlap.

Der Reflektorabschnitt 16 formt das dritte Lichtbündel 28 in ein viertes Lichtbündel 30 um. Das vierte Lichtbündel 30 umfasst kollimiertes Licht, das auf den Lichtauskoppelabschnitt 14 gerichtet ist. Der Lichtauskoppelabschnitt 14 umfasst beispielsweise in einer yz-Ebene sich aneinander anschließende sammelnde und streuende Abschnitte, um das vierte Lichtbündel 30 in eine Abstrahllichtverteilung 32 oder eine Fernlichtverteilung umzuformen. Der Lichtauskoppelabschnitt 14 ist insbesondere zu einer Erzeugung einer Abblendlichtverteilung ausgestaltet. Selbstverständlich kann der Lichtauskoppelabschnitt 14 hinsichtlich seiner Ausformung auch anders ausgestaltet sein. Der Lichtauskoppelabschnitt 14 misst beispielsweise in z-Richtung zwischen 20 und 40 mm und in y-Richtung zwischen 15 und 25 mm, womit kompakte Lichtauskoppelabschnitt 14 nebeneinander anordenbar sind und so zu einem kompakten Scheinwerfer führen.The reflector section 16 converts the third light beam 28 into a fourth light beam 30. The fourth light bundle 30 comprises collimated light, which is directed onto the light output section 14. The light decoupling section 14 comprises, for example, collecting and scattering sections adjoining one another in a yz plane in order to convert the fourth light bundle 30 into an emission light distribution 32 or a high beam distribution. The light decoupling section 14 is in particular designed to generate a low beam distribution. Of course, the light decoupling section 14 can also be configured differently with regard to its shape. The light decoupling section 14 measures, for example, between 20 and 40 mm in the z direction and between 15 and 25 mm in the y direction, with which compact light decoupling section 14 can be arranged next to one another and thus lead to a compact headlight.

In einer ersten Ausführungsform des Lichtmoduls 105 strahlt die Laserlichtquelle 2 ultraviolettes Laserlicht ab. Das Photolumineszenzelement 6 ist derart ausgebildet, dass auf das Photolumineszenzelement 6 treffendes ultraviolettes Laserlicht zumindest zu einem Teil in weißes Licht umgewandelt wird und als Teil des Sekundärlichtbündels 22 abstrahlt wird. Die Laserlichtquelle 2, die ultraviolettes Laserlicht abstrahlt, das auf das Photolumineszenzelement 6 gerichtet wird, hat den Vorteil, dass das durch das Photolumineszenzelement 6 erzeugte weiße Licht keine Anteile von gestreutem Laserlicht enthält bzw. enthalten muss, um in der Überlagerung aller Beiträge weißes Licht zu erhalten. Somit ist es möglich, das gestreute ultraviolette Laserlicht im Strahlengang herauszufiltern. Des Weiteren wird insbesondere von der Oberfläche 26 aber auch von tieferen Schichten des Photolumineszenzelements 6 insbesondere von der rückseitigen Verspiegelung des Photolumineszenzelement 6 ultraviolettes Laserlicht als Teil des Sekundärlichtbündels 22 in einen Raum 34 zwischen dem Photolumineszenzelement 6 und den Lichteinkoppelabschnitt 12 eingestrahlt. Der Lichteinkoppelabschnitt 12 umfasst eine dichroitische Schicht, die weißes Licht aus dem Sekundärlichtbündel 22 in den Lichtleitkörper 10 hinein transmittiert und ultraviolettes Laserlicht im Wesentlichen in den Raum 34 zurück auf das Photolumineszenzelement 6 reflektiert. Der Lichtleitkörper 10 kann aus einem Material gefertigt sein, das ultraviolettes Licht im Strahlengang im Wesentlichen absorbiert und weißes Licht im Strahlengang im Wesentlichen nicht absorbiert sondern bis hin zu dem Lichtauskoppelabschnitt 14 transmittiert. Der Lichtauskoppelabschnitt 14 kann ebenso dichroitisch ausgeführt sein, so dass das durch den Lichtleitkörper 10 geleitete weiße Licht im Wesentlichen transmittiert wird und ultraviolettes Licht im Wesentlichen in den Lichtleitkörper 10 hinein zurück reflektiert wird. Selbstverständlich kann die erste Ausführungsform auch ohne dichroitische Beschichtungen im Bereich Lichteinkoppelabschnitts 12 und/oder des Lichtauskoppelabschnitts 14 vorgesehen sein. Insbesondere ist der Lichteinkoppelabschnitt 12 derart dichroitisch ausgestaltet, sodass mehr als 97 % des weißen Lichtes transmittiert und über 90 % des ultravioletten Lichtes reflektiert werden. Insbesondere ist der Lichtauskoppelabschnitt 14 derart dichroitisch ausgestaltet, sodass mehr als 97 % des weißen Lichtes transmittiert und über 90 % des ultravioletten Lichtes reflektiert werden.In a first embodiment of the light module 105, the laser light source 2 emits ultraviolet laser light. The photoluminescent element 6 is designed such that ultraviolet laser light striking the photoluminescent element 6 is converted at least in part into white light and as part of the secondary light bundle 22 is emitted. The laser light source 2, which emits ultraviolet laser light and is directed onto the photoluminescent element 6, has the advantage that the white light generated by the photoluminescent element 6 does not have to contain any portions of scattered laser light in order to add white light in the superposition of all contributions receive. It is thus possible to filter out the scattered ultraviolet laser light in the beam path. Furthermore, in particular from the surface 26 but also from deeper layers of the photoluminescent element 6, in particular from the rear mirroring of the photoluminescent element 6, ultraviolet laser light as part of the secondary light bundle 22 is radiated into a space 34 between the photoluminescent element 6 and the light coupling section 12. The light coupling section 12 comprises a dichroic layer, which transmits white light from the secondary light bundle 22 into the light guide body 10 and essentially reflects ultraviolet laser light back into the space 34 onto the photoluminescent element 6. The light guide body 10 can be made of a material that essentially absorbs ultraviolet light in the beam path and essentially does not absorb white light in the beam path, but rather transmits it as far as the light output section 14. The light decoupling section 14 can also be made dichroic, so that the white light guided through the light guide body 10 is essentially transmitted and ultraviolet light is essentially reflected back into the light guide body 10. Of course, the first embodiment can also be provided without dichroic coatings in the area of light coupling section 12 and / or light coupling section 14. In particular the light coupling section 12 is designed in a dichroic manner such that more than 97% of the white light is transmitted and over 90% of the ultraviolet light is reflected. In particular, the light outcoupling section 14 is designed in a dichroic manner such that more than 97% of the white light is transmitted and over 90% of the ultraviolet light is reflected.

Figur 2b zeigt eine zweite Ausführungsform des Lichtmoduls 105, bei der die Laserlichtquelle 2 im Wesentlichen blaues Laserlicht abstrahlt. Das Photolumineszenzelement 6 wandelt blaues Laserlicht in gestreutes Laserlicht und Lumineszenzlicht, welches in Form von weißem Mischlicht von dem Photolumineszenzelement 6 abgestrahlt wird. Der Lichteinkoppelabschnitt 12 umfasst abschnittsweise eine Reflexschicht 27 zur Reflexion von auftreffendem blauen Laserlicht zurück auf das Photolumineszenzelement 6. Mithin kann ein nicht genutzter aber potentiell gefährlicher Teil des blauen Laserlichts zurück auf das Photolumineszenzelement 6 gestrahlt und zur Weißlichterzeugung genutzt werden. Selbst bei einem Auftreffen von nicht gestreutem blauem Laserlicht sorgt die Reflexschicht 27 dafür, dass dieses nicht in den Lichtleitkörper 10 eingekoppelt wird. Figure 2b shows a second embodiment of the light module 105, in which the laser light source 2 emits essentially blue laser light. The photoluminescent element 6 converts blue laser light into scattered laser light and luminescent light, which is emitted by the photoluminescent element 6 in the form of white mixed light. The light coupling section 12 comprises sections of a reflective layer 27 for reflecting incident blue laser light back onto the photoluminescent element 6. Accordingly, an unused but potentially dangerous part of the blue laser light can be radiated back onto the photoluminescent element 6 and used to generate white light. Even if blue laser light that is not scattered strikes, the reflective layer 27 ensures that it is not coupled into the light guide body 10.

Des Weiteren weist der Lichteinkoppelabschnitt 12 ein Fenster 29 ohne Reflexschicht 27 auf, um einen möglichst großen Teil des Sekundärlichtbündels 22 mit Lumineszenzlicht und gestreutem Laserlicht in den Lichtleitkörper 10 einzuleiten. Mithin ist die Reflexschicht 27 im Bereich des Fensters 29 unterbrochen. Im Gegensatz zu der in Figur 2a gezeigten Ausführungsform wird gestreutes Primärlicht, also gestreutes Laserlicht zur Erzeugung von weißem Licht mit benötigt. Der Lichtleitkörper 10 ist im Strahlengang ausgehend von dem Lichteinkoppelabschnitt 12 hin zu dem Lichtauskoppelabschnitt 14 im Wesentlichen für das von dem Photolumineszenzelement 6 abgestrahlte Mischlicht transmittierend ausgebildet. Der Lichtauskoppelabschnitt 14 umfasst eine Antireflex-Schicht.Furthermore, the light coupling section 12 has a window 29 without a reflective layer 27 in order to introduce as large a part of the secondary light bundle 22 as possible with luminescent light and scattered laser light into the light guide body 10. The reflective layer 27 is therefore interrupted in the region of the window 29. In contrast to that in Figure 2a Embodiment shown is scattered primary light, ie scattered laser light Generation of white light with needed. Starting from the light coupling section 12 to the light coupling section 14, the light guide body 10 is essentially designed to be transmitting for the mixed light emitted by the photoluminescent element 6. The light decoupling section 14 comprises an antireflection layer.

Das Lichtmodul 105 kann in den Figuren 2a und 2b einen Lichtleitkörper 10 aufweisen, der als gemeinsames Spritzgussteil zusätzlich einem weiteren Lichtmodul 106 zugeordnet ist.The light module 105 can be used in the Figures 2a and 2 B have a light guide body 10, which is additionally assigned to a further light module 106 as a common injection molded part.

Figur 3 zeigt ein schematisches Ablaufdiagramm 40 zur Herstellung des Lichtmoduls 105, 106. In einem ersten Schritt 42 wird Laserlicht der Laserlichtquelle 2 durch die Primäroptikeinrichtung 4 hindurch auf das Photolumineszenzelement 6 gerichtet. In einem zweiten Schritt 44 wird eine Ist-Lage des Lichtflecks auf der Oberfläche 26 des Photolumineszenzelements 6 ermittelt. Diese Ermittlung der Ist-Lage des Lichtflecks erfolgt durch eine Aufnahme mittels einer Kamera. In einem dritten Schritt 46 wird ein Unterschied zwischen der ermittelten Ist-Lage des Lichtflecks und einer Soll-Lage des Lichtflecks ermittelt. In einem vierten Schritt 48 werden in Abhängigkeit von dem ermittelten Unterschied das Photolumineszenzelement 6 und die Sekundäroptikeinrichtung 8 derart zueinander justiert, sodass die Ist-Lage des Lichtflecks im Wesentlichen mit der Soll-Lage des Lichtflecks übereinstimmt. Insbesondere bei eines bezüglich der Wellenlänge des Laserlichts reflektierend ausgebildeten Lichteinkoppelabschnitts 12 gemäß der vorstehend erwähnten ersten Ausführungsform kann auf diese Art und Weise das von dem Lichteinkoppelabschnitt 12 rückreflektierte Licht mit der Wellenlänge des Laserlichts auf den Brennpunkt 24 der Primäroptikeinrichtung 4 auf dem Photolumineszenzelement 6 fokussiert werden, um so die Effizienz des Lichtmoduls 105 hinsichtlich der Weißlichterzeugung zu erhöhen. Figure 3 shows a schematic flow diagram 40 for producing the light module 105, 106. In a first step 42, laser light from the laser light source 2 is directed through the primary optics device 4 onto the photoluminescent element 6. In a second step 44, an actual position of the light spot on the surface 26 of the photoluminescent element 6 is determined. This determination of the actual position of the light spot is carried out by recording with a camera. In a third step 46, a difference is determined between the determined actual position of the light spot and a target position of the light spot. In a fourth step 48, the photoluminescent element 6 and the secondary optics device 8 are adjusted relative to one another as a function of the difference determined, so that the actual position of the light spot essentially corresponds to the desired position of the light spot. In particular in the case of a light coupling section 12 which is designed to be reflective with respect to the wavelength of the laser light in accordance with the above-mentioned first embodiment, the light reflected back from the light coupling section 12 can also be used in this way of the wavelength of the laser light can be focused on the focal point 24 of the primary optics device 4 on the photoluminescent element 6, so as to increase the efficiency of the light module 105 with regard to the generation of white light.

Alternativ zu dem vierten Schritt 48 kann zur Qualitätssicherung ein bereits zu der Sekundäroptikeinrichtung 8 festgelegtes Photolumineszenzelement 6 auf dessen korrekte Justierung hin überprüft werden. Insbesondere kann das Lichtmodul 105 bei einem zu großen Unterschied zwischen der Ist-Lage des Lichtflecks und der Soll-Lage des Lichtflecks ausgesondert werden.As an alternative to the fourth step 48, a photoluminescent element 6 which has already been fixed to the secondary optics device 8 can be checked for its correct adjustment for quality assurance. In particular, the light module 105 can be rejected if the difference between the actual position of the light spot and the desired position of the light spot is too great.

Figur 4 zeigt in schematischer Form einen Teil des Lichtleitkörpers 10 in einer Schnittansicht, wobei der Reflektorabschnitt 16 facettiert ausgebildet ist. So weist der Reflektorabschnitt 16 Facettenelemente 16a, 16b, 16b auf, welche dem einen Photolumineszenzelement 6 zugeordnet sind. So kann das mittig angeordnete Facettenelement 16b zu einer zentralen Ausleuchtung der Fahrbahn dienen. Die Facettenelemente 16a und 16b können beispielsweise zur Seitenausleuchtung vorgesehen sein.
Figur 5 zeigt in schematischer Form eine Draufsicht auf das rückseitig verspiegelte Photolumineszenzelement 6. In der oben erwähnten ersten Ausführungsform schließt sich an die Oberfläche 26, die zur Abstrahlung des weißen Lichtes von dem Photolumineszenzelement 6 vorgesehen ist, eine dem Lichteinkoppelabschnitt 12 zugewandte Spiegelfläche 50 unmittelbar an. Es ergibt sich somit eine Kante 52 zwischen der Oberfläche 26 und der Spiegelfläche 50. Das Primärlichtbündel 20 wird in einem Fokussierungsbereich 54, der insbesondere den Brennpunkt 24 umfasst und als Leuchtfleck bezeichenbar ist, derart auf dem Photolumineszenzelement 6 fokussiert, sodass der Fokussierungsbereich 54 zum Teil auf der Spiegelfläche 50 und zum Teil auf der Oberfläche 26 liegt. Durch einen derart gewählten Fokussierungsbereich 54 wird die Kante 52 in der Abstrahllichtverteilung 32 vorteilhaft so abgebildet, dass sich ein hoher Lichtintensitätsunterschied ergibt. Beispielsweise kann so die Hell-Dunkel-Grenze besser dargestellt werden. Darüber hinaus wird Laserlicht von der Spiegelfläche 50 gemäß dem beispielhaft dargestellten Lichtstrahl 56 auf den Lichteinkoppelabschnitt 12 reflektiert. Die Spiegelfläche 50 kann beispielsweise als Beschichtung auf der Oberfläche 26 des Photolumineszenzelements 6 angeordnet sein. Der Lichtstrahl 56 mit reflektiertem Laserlicht wird von dem für Laserlicht reflektierend ausgestalteten Lichteinkoppelabschnitt 12 beispielhaft dargestellt durch einen Lichtstrahl 58 zurück auf das Photolumineszenzelement 6 in einen Rückkoppelbereich 60 auf der Oberfläche 26 reflektiert. Das in den Rückkoppelbereich 60 von dem Lichteinkoppelabschnitt 12 zurück reflektierte Laserlicht kann so zur weiteren Weißlichterzeugung und somit zur Effizienzerhöhung genutzt werden. Figure 4 shows a schematic view of part of the light-guiding body 10 in a sectional view, the reflector section 16 being of faceted design. The reflector section 16 thus has facet elements 16a, 16b, 16b which are assigned to the one photoluminescent element 6. The centrally arranged facet element 16b can thus be used for central illumination of the roadway. The facet elements 16a and 16b can be provided, for example, for side illumination.
Figure 5 shows in schematic form a top view of the backside mirrored photoluminescent element 6. In the above-mentioned first embodiment, the surface 26, which is provided for emitting the white light from the photoluminescent element 6, is directly adjoined by a mirror surface 50 facing the light coupling section 12. An edge 52 thus results between the surface 26 and the mirror surface 50. The primary light beam 20 is in such a way in a focusing area 54, which in particular comprises the focal point 24 and can be designated as a light spot Focuses photoluminescent element 6 so that the focusing area 54 lies partly on the mirror surface 50 and partly on the surface 26. By means of a focusing area 54 selected in this way, the edge 52 is advantageously imaged in the radiation light distribution 32 in such a way that there is a large difference in light intensity. For example, the light-dark boundary can be displayed better in this way. In addition, laser light is reflected from the mirror surface 50 onto the light coupling section 12 in accordance with the light beam 56 shown as an example. The mirror surface 50 can be arranged, for example, as a coating on the surface 26 of the photoluminescent element 6. The light beam 56 with reflected laser light is reflected by the light coupling section 12, which is designed to be reflective for laser light, as an example, reflected by a light beam 58 back onto the photoluminescent element 6 into a feedback region 60 on the surface 26. The laser light reflected back into the feedback region 60 from the light coupling section 12 can thus be used for further white light generation and thus for increasing the efficiency.

In der vorangehenden erwähnten zweiten Ausführungsform des Lichtmoduls 105 mit einer Laserlichtquelle, die blaues Laserlicht erzeugt, ist alternativ zu der Spiegelfläche 50 eine dem Lichteinkoppelabschnitt 12 zugewandte stark streuende und/oder Laserlicht absorbieren Absorptionsfläche so angeordnet, dass sich diese an die Oberfläche 26 des Photolumineszenzelements 6 anschließt, um ebenso eine Kante zwischen der Oberfläche 50 und der Absorptionsfläche zu bilden, um in der Abstrahllichtverteilung 32 beispielsweise eine hohe Lichtintensität bis zum Rand der Hell-Dunkel-Grenze zu erreichen.In the aforementioned second embodiment of the light module 105 with a laser light source that generates blue laser light, as an alternative to the mirror surface 50, a strongly scattering and / or absorbing absorption surface facing the light coupling section 12 is arranged in such a way that it is attached to the surface 26 of the photoluminescent element 6 in order to likewise form an edge between the surface 50 and the absorption surface, in order to achieve, for example, a high light intensity in the radiation light distribution 32 up to the edge of the light-dark boundary.

Claims (13)

  1. A light module (105; 106) for a lighting device (101) of a motor vehicle for radiating a radiant light distribution (32), comprising:
    - a laser light source (2) and a primary optical device (4) adapted to generate a primary light beam (20) comprising laser light;
    - a photoluminescent element (6) arranged such that the primary light beam (20) impinges on the photoluminescent element (6) to generate from the impinging primary light beam (20) a secondary light beam (34) comprising white light; and
    - a one-piece secondary optical device (8) with a light guide body (10) arranged in the beam path after the photoluminescent element (6),
    the light guide body (10) comprising a light extraction portion (14) for radiating the radiant light distribution (32); characterized in that
    the light guide body comprises:
    - a light couplng portion (12) comprising at least partially a reflective layer (27, 28) for allowing a first part of the secondary light beam (22) to enter the light guide body (10) by means of the light coupling portion (12) and reflecting a second part of the secondary light beam (22) back onto the photoluminescent element (6); and
    - a reflector portion (16) for reflecting light transmitting through the light coupling portion (12) into the light guide body (10) by means of the reflector porton (16) to the light extraction portion (14).
  2. The light module (105; 106) according to claim 1, wherein the reflector portion (16) and the light coupling portion (12) are matched to one another such that a focal point of at least part of the reflector section (16) is located outside the secondary optical device (8) in the region of the
    photoluminescence element (6).
  3. The light module (105; 106) according to claim 1 or 2, wherein the light coupling portion (12) is spherical, and wherein the associated center of curvature is located in or within the photoluminescent element (6).
  4. The light module (105; 106) according to claim 3, wherein a first focusing range of the primary optical device (4), in particular the focal point (24) of the primary optical device (4), a second focusing range of the reflector portion (16),
    in particular the focal point of the reflector portion (16) and the centre of curvature of the light coupling portion (12) overlap, in particular coincide.
  5. The light module (105; 106) according to one of the above claims, wherein the light coupling portion (12) is arranged and designed by its shape and by a special coating such that incident white light is substantially transmitted and light with a wavelength of the laser light is substantially reflected back incident on the photoluminescence element (6).
  6. The light module (105; 106) according to one of the above claims, wherein the light guide body (10) is arranged and designed so that between the light coupling portion (12) and the light extraction portion (14), light with a wavelength of the laser light is substantially absorbed and white light is substantially transmitted.
  7. The light module (105; 106) according to one of the above claims wherein the light extraction portion (14) is arranged and configured such that incident white light is substantially transmitted and light with a wavelength of the laser light is substantially reflected back into the light guide body (10).
  8. The light module (105; 106) according to one of the above claims, wherein a mirror surface (50) facing the light coupling portion (12) immediately follows up with an at least partially straight and abrupt transition at a surface (26) of the photoluminescent element (6).
  9. The light module (105; 106) according to one of the above Claims wherein the laser light source (2) generates ultraviolet laser light.
  10. The light module (105; 106) according to one of claims 1 to 3, wherein the light coupling portion (12) and/or the light extraction portion (14) comprise an anti-reflection coating.
  11. The light module (105; 106) according to one of claims 1 to 3 and 10, and wherein the laser light source (2) generates blue laser light.
  12. A method for producing the light module (105; 106) according to one of claims 1 to 11, characterized in that the primary light beam (20) is directed onto the photoluminescent element (6), that an actual position of a light spot on the surface (26) of the photoluminescent element (6) is determined,
    and that a difference between the determined actual position of the light spot and a nominal position of the light spot is determined.
  13. A motor vehicle headlamp (101) comprising one or more light modules (105; 106) according to one of claims 1 to 11.
EP16204284.0A 2015-12-23 2016-12-15 Light module for a lighting device of a motor vehicle Active EP3184883B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013841A1 (en) * 2011-11-11 2013-05-16 Docter Optics Se vehicle headlights
AT512590B1 (en) * 2012-03-12 2013-11-15 Zizala Lichtsysteme Gmbh Light guide element for a laser vehicle headlight and vehicle headlights
DE102012220481A1 (en) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh light module
DE102012220472A1 (en) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Kfz. lighting device
DE102013200521B4 (en) 2013-01-15 2024-03-21 Automotive Lighting Reutlingen Gmbh Primary optical device for motor vehicle headlights with laser light source, layer-like photoluminescence element, light-guiding element and reflection surfaces for light from the photoluminescence element and corresponding motor vehicle headlights

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