EP3184883A1 - Module d'éclairage pour un dispositif d'éclairage d'un véhicule automobile - Google Patents

Module d'éclairage pour un dispositif d'éclairage d'un véhicule automobile Download PDF

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Publication number
EP3184883A1
EP3184883A1 EP16204284.0A EP16204284A EP3184883A1 EP 3184883 A1 EP3184883 A1 EP 3184883A1 EP 16204284 A EP16204284 A EP 16204284A EP 3184883 A1 EP3184883 A1 EP 3184883A1
Authority
EP
European Patent Office
Prior art keywords
light
section
photoluminescent element
module
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.)
Granted
Application number
EP16204284.0A
Other languages
German (de)
English (en)
Other versions
EP3184883B1 (fr
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP3184883A1 publication Critical patent/EP3184883A1/fr
Application granted granted Critical
Publication of EP3184883B1 publication Critical patent/EP3184883B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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.
  • Automotive headlights having a laser light source are well known.
  • motor vehicle headlights can be created, which reach at high illuminance, low geometric dimensions and high efficiency headlights of more than 500 m.
  • a projection optical system has a multiplicity of transmitting and / or reflecting individual components. Exemplary is on the DE 10 2013 200 521 A1 directed.
  • a light module for motor vehicle headlamps which comprises at least one detection device, which is designed and arranged so that it is detectable, when a radiation intensity of light bundles, which extend in the beam path to a photoluminescent element in a primary space angle range about a primary beam axis exceeds a safety threshold.
  • the object of the invention is thus to reduce the dimensions of a light module with a laser light source, the radiation of potentially dangerous laser light is simply and compact prevented.
  • a light module for a lighting device of a motor vehicle for emitting a Abstrahllichtver Irish A laser light source and a primary optics device are designed to generate a primary light beam comprising laser light.
  • a photoluminescent element is arranged such that the primary light beam strikes the photoluminescent element, and that from the incident primary light beam a secondary light beam comprising white light which can contain laser light is generated.
  • a one-piece secondary optics device consists of a light guide arranged in the beam path after the photoluminescent element.
  • the light guide body comprises a light coupling section, which at least partially comprises a reflective layer to allow at least a first part of the secondary light beam to enter the light guide body by means of the light coupling section and to reflect a second part of the secondary light bundle and unconverted primary radiation back onto the photo luminescent element.
  • the light guide body includes a light extraction section to radiate the emission light distribution.
  • the light guide body further comprises a reflector section for deflecting 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-in section are matched to one another such that a focal point of at least part of the reflector section is located outside the secondary optics device in the region of the photoluminescent element. Consequently, the photoluminescent element is likewise 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 can be arranged outside the light guide body for generating the primary light bundle. In addition, there are advantages for the cooling of the photoluminescent element.
  • the Lichteinkoppelabites is spherical and the associated center of curvature is located on or within the photoluminescent element. In this way, it is advantageously achieved that a coupling of light into the light guide body takes place without a substantial refraction.
  • a first focusing region of the primary optics assembly in particular the focal point of the primary optics assembly
  • a second focusing region of the reflector section in particular the focal point of the reflector section
  • the center of curvature of the light coupling section coincide or overlap.
  • the light coupling-in section is arranged and configured such that incident white light is substantially transmitted and light having a wavelength of the laser light is reflected back substantially onto the photo-luminescent element. This is achieved by a corresponding coating on the light coupling surface. This advantageously prevents the escape of dangerous laser radiation.
  • the efficiency of the light module is improved, since laser light emitted by the photoluminescent element is deflected back onto it and used to generate further white light.
  • This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light. For example, ultraviolet light emitted from, for example, 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 guide body is arranged and configured such that light having a wavelength of the laser light is substantially absorbed between the light coupling section and the light coupling-out section and white light is substantially transmitted.
  • This embodiment is particularly advantageous when using a laser light source that generates ultraviolet laser light.
  • ultraviolet light is prevented from passing through the light guide body.
  • a passive safety concept for laser light sources emitting ultraviolet laser light is provided, which equally allowed the creation of smaller headlights.
  • active safety devices to increase the reliability of a motor vehicle headlamp can be omitted with a laser light source.
  • the light outcoupling section is arranged and configured such that incident white light is substantially transmitted and light with the wavelength of the laser light is reflected back substantially into the light guide body.
  • incident white light is substantially transmitted and light with the wavelength of the laser light is reflected back substantially into the light guide 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-in section directly adjoins a surface of the photoluminescent element.
  • a light-dark boundary can be imaged in the emission light distribution, which has a high light intensity up to its edge.
  • the transition between the mirror surface and the surface is abrupt and at least partially rectilinear.
  • the efficiency is increased since the light-emitting 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-in section and / or the light coupling-out section comprises an antireflection coating.
  • This embodiment is particularly suitable for laser light sources that generate blue laser light.
  • light having 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 included in the emission light distribution.
  • One embodiment relates to a light module arrangement comprising a first light module and a second light module, wherein the two light modules have a common light guide body.
  • a further reduction of the headlamp can be achieved while reducing costs.
  • One embodiment relates to a method for producing the light module, wherein the primary light beam is directed onto the photoluminescent element, wherein an actual position of a light spot of the laser light is determined on the surface of the photoluminescent element, and wherein a difference between the determined actual position of the light spot and a Target position of the light spot is determined.
  • a development of the method relates to an adjustment of the photoluminescent element and the secondary optics device as a function of the difference determined in relation to one another such that the actual position of the light spot substantially coincides with the desired position of the light spot.
  • a lighting device for motor vehicles is designated in its entirety by the reference numeral 101.
  • the lighting device 101 is formed in the illustrated embodiment as a motor vehicle headlight.
  • the lighting device 101 may also be designed as a light or the like which is arranged at the rear or laterally on 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 104.
  • the cover 104 is made of colorless plastic or glass.
  • the disk 104 may be formed without optically effective profiles (for example, prisms) as a so-called clear disk. Alternatively, the disk 104 may be provided at least in regions with optically active profiles, which in particular cause a scattering of the light passing through in the horizontal direction.
  • the light modules 105, 106 are arranged inside the headlight housing 102 inside the headlight housing 102.
  • the light modules 105, 106 are arranged fixed or relative to the housing 102 movable. By a relative movement of the light modules 105, 106 to the housing 102 in the horizontal direction, for example, a dynamic cornering function can be realized.
  • 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, highway, fog, static or dynamic cornering or any other static or adaptive Light distribution formed.
  • the light modules 105, 106 produce the desired light function either alone or in combination with each other by virtue of the light emission from each individual light module 105; 107 supplied partial light distributions are 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 fewer than the illustrated two light modules 105, 106 may be provided in the headlight housing 102.
  • FIG. 2a shows in a schematic sectional view of the light module 105.
  • the light module 105 comprises in the beam path 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-in section 12 and a light coupling-out section 14.
  • a reflector portion 16 is arranged in the beam path between the Lichteinkoppelabêt 12 and the Lichtauskoppelabites 14.
  • the light guide 10 is made of a material transmitting white light, 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 photoluminescence element 6 in a substantially focused manner as the first light beam 20.
  • the primary optics device 4 can be designed as a transmission optics and / or reflection optics.
  • the first light beam 20 is also referred to as a primary light bundle.
  • the photoluminescent element 6 is mirrored on the back and generates a second light beam 22, which can also be designated as a secondary light bundle.
  • the primary light bundle 20 preferably impinges on a surface 26 of the photoluminescent element 6 at a focal point 24 of the primary optics device 6. In particular, oblique incidence of light of the primary light bundle 20 on the photoluminescent element 6 can cause part of the laser light to be incident on the surface 26 of the photoluminescent element 6 Direction of the Lichteinkoppelabitess 12 are reflected.
  • a number of two to four laser light sources 2 with corresponding primary optics 4 can be arranged such 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 the third light beam 28.
  • the Lichteinkoppelabêt 12 is formed spherically, wherein the center of curvature is located in the focal point 24 on the surface 26.
  • the light coupling section 12 includes a reflective coating 25 which substantially reflects incident ultraviolet light.
  • the ultraviolet light coming from the photoluminescent element 6 onto the light coupling section 12 is irradiated back to the photoluminescent element 6.
  • white light passes through the reflective coating 25 and enters the optical waveguide 10.
  • the light-guiding body 10 comprises the spherically formed light coupling-in section 12 and a parabolic reflector section 16.
  • the reflector section 16 may be formed, for example, by a reflective coating or by an interface of the light-guiding body 10 on which total reflection occurs.
  • the reflector portion 16 transforms the third light beam 28 into a fourth light beam 30.
  • the fourth light beam 30 includes collimated light directed to the light extraction section 14.
  • the light extraction section 14 includes, for example, in a yz plane adjoining collecting and scattering sections to transform the fourth light beam 30 in a Abstrahllichtver gutter 32 or a high beam distribution.
  • the light extraction section 14 is designed in particular for producing a low-beam light distribution.
  • the Lichtauskoppelabêt 14 may be configured differently in terms of its shape.
  • the light coupling-out section 14 measures, for example, in the z-direction between 20 and 40 mm and in the y-direction between 15 and 25 mm, whereby compact Lichtauskoppelabites 14 can be arranged side by side, thus leading to a compact headlight.
  • the laser light source 2 radiates ultraviolet laser light.
  • the photoluminescent element 6 is designed in such a way that at least part of the ultraviolet laser light striking the photoluminescent element 6 is converted into white light and as part of the secondary light beam 22 is emitted.
  • the laser light source 2 emitting ultraviolet laser light which is directed to 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 to the superimposition of all the contributions receive. Thus, it is possible to filter out the scattered ultraviolet laser light in the optical path.
  • ultraviolet laser light is irradiated as part of the secondary light beam 22 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 beam 22 into the light guide body 10 and reflects ultraviolet laser light substantially into the space 34 back onto the photo luminescent element 6.
  • the light guide body 10 may be made of a material which substantially absorbs ultraviolet light in the beam path and substantially does not absorb white light in the beam path but transmits as far as the light coupling-out section 14.
  • the light extraction section 14 may also be configured dichroic, so that the white light guided by the light guide body 10 is substantially transmitted and ultraviolet light is substantially reflected back into the light guide body 10.
  • the first embodiment may also be provided without dichroic coatings in the region of the light coupling-in section 12 and / or of the light coupling-out section 14.
  • the light-coupling section 12 is dichroic, so that more than 97% of the white light is transmitted and reflected by more than 90% of the ultraviolet light.
  • the light extraction section 14 is configured to be dichroic, so that more than 97% of the white light is transmitted and reflected over 90% of the ultraviolet light.
  • FIG. 2b shows a second embodiment of the light module 105, in which the laser light source 2 emits substantially blue laser light.
  • the photoluminescent element 6 converts blue laser light into scattered laser light and luminescent light, which is emitted in the form of white mixed light from the photoluminescent element 6.
  • the light coupling-in section 12 comprises in sections a reflecting layer 27 for reflecting incident blue laser light back onto the photoluminescent element 6.
  • a reflecting layer 27 for reflecting incident blue laser light back onto the photoluminescent element 6.
  • the light coupling-in section 12 has a window 29 without reflecting layer 27 in order to introduce as large a part of the secondary light bundle 22 with luminescent light and scattered laser light into the light guide body 10. Consequently, the reflective layer 27 is interrupted in the region of the window 29. Unlike the in FIG. 2a Shown embodiment is scattered primary light, so scattered laser light for Generation of white light with needed.
  • the optical waveguide 10 is designed to be transmissive in the beam path starting from the light coupling-in section 12 towards the light decoupling section 14 substantially for the mixed light emitted by the photoluminescent element 6.
  • the light extraction section 14 comprises an antireflection layer.
  • the light module 105 can in the FIGS. 2a and 2 B have a light guide 10, which is additionally assigned to a further light module 106 as a common injection molded part.
  • FIG. 3 shows a schematic flow diagram 40 for producing the light module 105, 106.
  • laser light of the laser light source 2 is directed through the primary optics device 4 on 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 effected by a recording by means of a camera.
  • a difference between the determined actual position of the light spot and a desired position of the light spot is determined.
  • the photoluminescent element 6 and the secondary optics device 8 are adjusted to one another such that the actual position of the light spot substantially coincides with the desired position of the light spot.
  • the reflected light from the Lichteinkoppelabêt 12 with 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 respect to the white light generation.
  • a photoluminescent element 6 already fixed to the secondary optics device 8 can be checked for its correct adjustment. In particular, if the difference between the actual position of the light spot and the desired position of the light spot is too great, the light module 105 can be discarded.
  • FIG. 4 shows in schematic form a part of the light guide 10 in a sectional view, wherein the reflector portion 16 is formed faceted.
  • the reflector section 16 has facet elements 16a, 16b, 16b, which are assigned to the one photoluminescent element 6.
  • the centrally arranged facet element 16b can serve for a central illumination of the roadway.
  • the facet elements 16a and 16b can be provided for example for side illumination.
  • FIG. 5 shows in schematic form a plan view of the back-mirrored photoluminescent element 6.
  • the surface 26, which is provided for the emission of white light from the photoluminescent element 6, immediately adjoins a mirror surface 50 facing the light-coupling section 12. This results in an edge 52 between the surface 26 and the mirror surface 50.
  • the primary light beam 20 is in a focusing region 54, which in particular includes the focal point 24 and can be designated as a light spot, on the Photoluminescent element 6 focuses, so that the focusing region 54 lies partly on the mirror surface 50 and partly on the surface 26.
  • a focusing region 54 selected in this way, the edge 52 in the emission light distribution 32 is advantageously imaged in such a way that a high light intensity difference results.
  • the Varyscuro limit can be better represented.
  • laser light is reflected by the mirror surface 50 in accordance with the light beam 56 exemplified on the Lichteinkoppelabêt 12.
  • the mirror surface 50 may, for example, be arranged as a coating on the surface 26 of the photoluminescent element 6.
  • the light beam 56 with reflected laser light is exemplarily represented by the light coupling section 12 designed to be reflective for laser light by a light beam 58 back onto the photoluminescent element 6 in a feedback region 60 on the surface 26.
  • the laser light reflected back into the feedback region 60 from the light coupling-in section 12 can thus be used for further white light generation and thus for increasing the efficiency.
  • a light scattering and / or laser light absorbing surface facing the light coupling section 12 is arranged so as to be incident on the surface 26 of the photoluminescent element 6 as an alternative to the mirror surface 50 connected to also form an edge between the surface 50 and the absorption surface in order to achieve in the emission light distribution 32, for example, a high light intensity to the edge of the cut-off line.

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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)
EP16204284.0A 2015-12-23 2016-12-15 Module d'éclairage pour un dispositif d'éclairage d'un véhicule automobile Active EP3184883B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015226724.5A DE102015226724A1 (de) 2015-12-23 2015-12-23 Lichtmodul für eine Beleuchtungseinrichtung eines Kraftfahrzeugs

Publications (2)

Publication Number Publication Date
EP3184883A1 true EP3184883A1 (fr) 2017-06-28
EP3184883B1 EP3184883B1 (fr) 2020-07-01

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EP16204284.0A Active EP3184883B1 (fr) 2015-12-23 2016-12-15 Module d'éclairage pour un dispositif d'éclairage d'un véhicule automobile

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EP (1) EP3184883B1 (fr)
DE (1) DE102015226724A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013841A1 (de) * 2011-11-11 2013-05-16 Docter Optics Se Fahrzeugscheinwerfer
WO2013134803A1 (fr) * 2012-03-12 2013-09-19 Zizala Lichtsysteme Gmbh Élément guide de lumière pour projecteur de véhicule
DE102012220481A1 (de) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Lichtmodul
DE102012220472A1 (de) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Kfz.-Beleuchtungsvorrichtung
DE102013200521A1 (de) 2013-01-15 2014-07-17 Automotive Lighting Reutlingen Gmbh Primäroptikeinrichtung für KFZ-Scheinwerfer und KFZ-Scheinwerfer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012013841A1 (de) * 2011-11-11 2013-05-16 Docter Optics Se Fahrzeugscheinwerfer
WO2013134803A1 (fr) * 2012-03-12 2013-09-19 Zizala Lichtsysteme Gmbh Élément guide de lumière pour projecteur de véhicule
DE102012220481A1 (de) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Lichtmodul
DE102012220472A1 (de) 2012-11-09 2014-05-15 Automotive Lighting Reutlingen Gmbh Kfz.-Beleuchtungsvorrichtung
DE102013200521A1 (de) 2013-01-15 2014-07-17 Automotive Lighting Reutlingen Gmbh Primäroptikeinrichtung für KFZ-Scheinwerfer und KFZ-Scheinwerfer

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DE102015226724A1 (de) 2017-06-29
EP3184883B1 (fr) 2020-07-01

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