EP2917635B1 - Dispositif d'éclairage de véhicule - Google Patents

Dispositif d'éclairage de véhicule Download PDF

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Publication number
EP2917635B1
EP2917635B1 EP13788933.3A EP13788933A EP2917635B1 EP 2917635 B1 EP2917635 B1 EP 2917635B1 EP 13788933 A EP13788933 A EP 13788933A EP 2917635 B1 EP2917635 B1 EP 2917635B1
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EP
European Patent Office
Prior art keywords
light
primary
emission
laser light
laser
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
EP13788933.3A
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German (de)
English (en)
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EP2917635A1 (fr
Inventor
Ernst-Olaf Rosenhahn
Doris Boebel
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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Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP2917635A1 publication Critical patent/EP2917635A1/fr
Application granted granted Critical
Publication of EP2917635B1 publication Critical patent/EP2917635B1/fr
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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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations
    • 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
    • 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
    • F21S41/25—Projection lenses
    • F21S41/275—Lens surfaces, e.g. coatings or surface structures
    • 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
    • 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 motor vehicle lighting device with a laser light source according to the preamble of claim 1.
  • Laser light sources e.g. semiconductor lasers, laser diodes
  • LEDs light emitting diodes
  • One advantage of using laser light is that optical systems for laser light can be implemented with little installation space.
  • lasers usually emit monochromatic light or light in a narrow range of wavelengths.
  • white mixed light is usually desired or required by law.
  • photoluminescence converters or photoluminescence elements To convert monochromatic light into polychromatic or white light, the use of photoluminescence converters or photoluminescence elements is known in the field of white light-emitting diodes (LEDs) or luminescence conversion LEDs. These usually have a photoluminescent dye.
  • the light from an LED which usually emits colored (e.g. blue) light, excites the photoluminescent dye to photoluminescence, whereupon the photoluminescent dye itself emits light of other wavelengths (e.g. yellow). In this way, part of the incident light of one wavelength range can be converted into light of another wavelength range. As a rule, a further portion of the incident light is scattered by the photoluminescent element.
  • LEDs white light-emitting diodes
  • luminescence conversion LEDs usually have a photoluminescent dye.
  • the light from an LED which usually emits colored (e.g. blue) light, excites the photoluminescent dye to photoluminescence, whereupon the
  • the scattered light and the light emitted by photoluminescence then superimpose additively and lead e.g. to white mixed light.
  • the mechanism of photoluminescence can be differentiated into fluorescence (short life) and phosphorescence (long life) depending on the lifetime of the excited state.
  • the photoluminescence element is of relevance to safety.
  • One problem is that if the position of the photoluminescent element is changed or if the photoluminescent element is destroyed (for example due to mechanical effects, accidents, manufacturing defects or design defects), potentially dangerous, highly focused laser beams can emerge from the motor vehicle lighting device.
  • a lighting device with the features of the preamble of claim 1 is in the EP 2 461 092 A2 described.
  • the object of the invention is to enable the use of laser light sources in motor vehicle lighting devices while adhering to safety requirements and to avoid as far as possible a hazard from strongly collimated laser beams emerging from the lighting device.
  • the lighting device comprises a laser light source for emitting a primary light bundle in a primary solid angle area around a primary emission direction starting from the laser light source. Furthermore, a photoluminescent element is provided which is arranged in such a way that the primary light beam that can be emitted by the laser light source strikes the photoluminescent element. An intermediate optics or a beam guiding means, e.g. a light guide, may be provided to direct the laser light onto the photoluminescent element.
  • the photoluminescent element is also designed in such a way that the incident primary light bundle can emit a secondary light distribution with, in particular, polychromatic or white light using photoluminescence.
  • a (one-piece or multi-part) radiation optics device which is designed such that the secondary light distribution can be transformed (deflected and / or reflected and / or projected) into a desired radiation light distribution of the lighting device.
  • the lighting device also comprises an emission inhibitor which is designed and arranged such that the transformation into the emission light distribution can be suppressed for those light bundles which, starting from the laser light source, run in the primary solid angle range around the primary emission direction.
  • an emitted light distribution can be achieved which corresponds to the requirements and legal specifications for motor vehicle lighting devices.
  • Possible areas of application are vehicle headlights and vehicle lights, for example signal lights.
  • vehicle headlights and vehicle lights for example signal lights.
  • the above-mentioned Use the advantages of the laser light source, in particular the high luminance, high intensity and high efficiency of the laser system. Such properties can be advantageous in particular for headlights, for example with a high beam function.
  • the usually monochromatic laser light is converted via the photoluminescent element into light with the desired properties, in particular into polychromatic or white light.
  • White light is, in particular, light that complies with legal requirements (eg ECE or SAE) that are specified for the various light functions.
  • the highly collimated and coherent and therefore potentially dangerous laser light is converted into an at least partially diffuse, largely incoherent mixed light which essentially no longer has the hazard potential of laser light.
  • the photoluminescent element is designed in particular such that it scatters the primary light bundle and that at least a portion of the primary light bundle serves to excite photoluminescence in the photoluminescent element.
  • the photoluminescent element can for example be designed as a glass or ceramic plate which is coated with or contains a luminescent dye.
  • a luminescent dye for example, phosphorus-containing luminescent dyes are suitable.
  • blue laser light (wavelength approx. 450 nm) can be converted at least partially into yellow (especially incoherent) light, for example with wavelengths in the range around 570 nm (or, for example, a broad range between 450 nm) through photoluminescence in the photoluminescent element up to 780 nm).
  • the converted light can additively mix with the blue light scattered on the photoluminescent element to form white light.
  • the secondary light distribution is thus emitted, for example, by partially converting the primary light bundle via photoluminescence and partially (in particular diffuse and / or incoherent) scattering of the primary light bundle on the photoluminescent element.
  • the laser light source acting as the primary light source
  • a primary light bundle runs essentially in the primary solid angle range around the primary beam direction.
  • the laser light source can also include beam shaping means, intermediate optics and / or beam guiding means, which direct the primary light bundle into the primary solid angle range around the primary emission direction.
  • the laser light source can comprise a laser diode and a primary light guide (e.g. glass fiber), the light emitted by the laser diode being able to be coupled in and guided through the primary light guide into the primary solid angle area around the primary emission direction.
  • the primary light bundle normally hits the photoluminescent element. This emits the secondary light distribution by stimulating photoluminescence and / or by scattering.
  • the light beams of the secondary light distribution impinge on the radiation optics device and are transformed by this into the radiation light distribution of the lighting device, which is usually concentrated around a main radiation direction.
  • the photoluminescent element acts as the actual light source for the emitting optics device, the secondary light distribution of which essentially no longer exhibits the hazard potential of laser light.
  • the potentially dangerous laser light in the primary light beam therefore does not reach the emitted light distribution directly.
  • the photoluminescent element thus ensures compliance with the safety requirements outlined at the beginning during normal operation.
  • the photoluminescent element can be arranged directly on the laser light source.
  • the photoluminescent element can also be arranged at a distance from the laser light source, since the emitted laser light bundles due to their close focus and collimation (or through an intermediate lens) can also be directed to a spaced photoluminescent element.
  • the radiation optics device can be used as a reflector, e.g. parabolic reflector or as a reflector arrangement. It is also possible that the radiation optics device is used as a projection device, e.g. comprising a projection lens.
  • the radiation optics device can also consist of several optical elements, e.g. Primary optics and secondary optics.
  • the photoluminescent element is not arranged in the beam path of the primary light bundle (e.g. broken or displaced) due to mechanical influences, an accident or construction faults, the laser light of the primary light bundle is suppressed by the radiation inhibitor.
  • the emission inhibitor is thus arranged in such a way that it is prevented that potentially dangerous laser light reaches the emission light distribution.
  • the radiation inhibitor can be arranged in the beam path behind the photoluminescent element (and for example in front of the radiation optics device) at a location through which the primary light bundle of the laser light source would radiate in the absence of the photoluminescent element.
  • the primary beam direction is to be understood as a primary beam axis (i.e. an axis defined in the spatial course with respect to the laser light source).
  • the laser light source is designed to emit a primary light beam into the primary solid angle element about the primary beam axis.
  • the emission inhibitor is set up so that the transformation into the emission light distribution can be suppressed for those light bundles which run in the primary solid angle range around the primary beam axis.
  • each laser beam can be used in an emission inhibitor in the interior of the lighting device be terminated. In the event of a malfunction, a hazard from emitted laser beams is therefore avoided in a manner that is easy to implement.
  • This protective device has a high level of functional reliability since, in particular, movable mechanical components or complex electronic controls are not absolutely necessary.
  • the above-mentioned suppression of the radiation takes place insofar as the deformation for the light bundles running in the primary solid angle range around the primary radiation direction is inhibited or weakened or at least substantially prevented or completely prevented.
  • the radiation inhibitor is designed in particular such that the maximum intensity of a light bundle running in the primary solid angle range around the primary radiation direction is reduced to a predetermined fraction, in particular in the range from 0.01% to 30% of the original maximum light intensity.
  • the radiation inhibitor can in particular be designed to be matched to the laser light source in such a way that the intensity of a light bundle running in the primary solid angle range around the primary radiation direction can be lowered below a predetermined safety value.
  • the influence of the radiation inhibitor on the radiation light distribution is small or negligible. This is due to the fact that the extent of the radiation inhibitor is preferably dimensioned in such a way that the collimated and high-intensity laser light of the primary light bundle is suppressed in the event that it strikes directly (without a photoluminescent element).
  • the photoluminescent element when the photoluminescent element is effective, the emitted light distribution is essentially generated by the secondary light distribution. This is less collimated and more diffuse. The power of the secondary light distribution is therefore distributed more homogeneously in the room. A suppression of light rays in the comparatively small primary solid angle range around the primary emission direction therefore leads to Normal operation does not result in a noticeable loss of performance or disturbances in the light distribution.
  • the radiation inhibitor is preferably arranged on the radiation optics device itself.
  • an arrangement in an entry position of the radiation optics device is possible.
  • the entry position is the one in which a light bundle (starting from the laser light source) in the primary solid angle range around the primary emission direction strikes the emission optics device for the first time.
  • the radiation inhibitor can be arranged in an exit position of the radiation optics device. This exit position is the one through which a light bundle proceeding from the laser light source in the primary solid angle region around the primary emission direction emerges from the emission optics device after it has hit or entered the latter.
  • an emission inhibitor can be arranged both in the entry position and in the exit position.
  • the radiation inhibitor is preferably arranged in the beam path between the photoluminescent element and the radiation optics device. This prevents potentially dangerous laser light from being deflected or transformed by the emitting optics device in the direction of the emitting light distribution from the outset.
  • the radiation inhibitor can also be arranged in the beam path only after an entry position of the emitting optics device, for example in or after an exit position of the emitting optics device. As a result, the transformation of the light bundle influenced by the emission inhibitor into the emission light distribution is also suppressed as a result.
  • the radiation inhibitor is preferably arranged at a distance from the photoluminescent element and from the radiation optics device. This can be an advantage, since the radiation inhibitor can heat up when exposed to high-intensity laser light.
  • the radiation inhibitor comprises a deflecting prism which is designed in such a way that a light beam impinging on the deflecting prism and passing through the deflecting prism can be deflected in such a way that it does not contribute to the emission of light distribution.
  • a configuration is conceivable such that an incident light bundle is deflected into an absorber or a light trap, preferably in the interior of the lighting device. The deflection takes place preferably in a direction essentially perpendicular to the main emission direction of the lighting device.
  • the emission optics device comprises a projection lens, the emission inhibiting means being designed as a deflecting prism which is integrally formed on a light passage surface of the projection lens.
  • This light passage area can be a light entry area or a light exit area of the projection lens.
  • the deflecting prism is designed, in particular, in such a way that a light beam running through the deflecting prism is deflected in such a way that it does not contribute to the light distribution (e.g. in a direction essentially perpendicular to the main direction of emission of the lighting device).
  • the deflecting prism can have at least one convex or concave curved surface in such a way that a light bundle deflected (in particular initially collimated) by the deflecting prism is converted into a diverging light bundle. This reduces the light intensity in the deflected light bundle and is advantageous if a laser beam deflected with the deflecting prism is to be terminated, for example in an absorber or a light trap, since the power can be distributed over a larger area.
  • a protective screen is provided in the beam path between the laser light source and the radiation optics device. This can be arranged in the beam path between the laser light source and the photoluminescent element and / or between the photoluminescent element and the radiation optics device his.
  • the protective screen is preferably designed in such a way that such light bundles are absorbed or reflected which, starting from the laser light source, run outside a safe solid angle range around the primary emission direction of the laser light source.
  • the safe solid angle range is preferably selected to be exactly the same as the primary solid angle range around the primary emission direction, i.e. the protective screen is designed in particular in such a way that light bundles are absorbed or reflected which run outside the primary solid angle area around the primary emission direction.
  • the protective screen is preferably designed as a perforated screen.
  • the protective screen can be arranged at a distance from the laser light source and the photoluminescent element. However, it is also conceivable that the protective screen is arranged in contact with the photoluminescent element or against the laser light source.
  • the laser light source is preferably designed as a semiconductor laser, in particular as a laser diode.
  • Laser light sources can be selected which emit essentially monochromatic light.
  • a blue laser diode can be used that emits light with a wavelength in the range of 450 nm.
  • the photoluminescent element is no longer in the beam path of the primary light bundle in the event of a fault, there is a risk that the laser beam will cause further damage to the lighting devices.
  • parts of the lighting device or the radiation inhibitor itself can heat up strongly as a result of the incident laser beam, which can lead to fire hazard.
  • Further damage to the lighting device can be avoided by deactivating the laser light source if there is a fault.
  • a detection device can be provided, by means of which the intensity of laser light in the primary solid angle range around the primary beam direction can be monitored. A sharp increase in the recorded intensity can indicate a malfunction. It can then be provided that the laser light source is switched off on the basis of a detector signal from the detection device.
  • the laser light source can be switched off with a longer reaction time with regard to traffic safety.
  • a simple detection device with possibly simple control electronics can therefore be used.
  • lighting devices are outlined that can be used, for example, as vehicle headlights.
  • lighting devices are outlined that can be used, for example, as vehicle headlights. Corresponding configurations are also possible for motor vehicle lights or other motor vehicle lighting devices.
  • the Figure 1 shows a motor vehicle lighting device 10 with a laser light source 12. This emits a primary light bundle 14 of laser light which is collimated and concentrated around a primary emission direction 16 in a small primary solid angle range.
  • a protective screen 18 designed as a perforated screen is arranged in the beam path following the laser light source 12. This can be present or omitted in all embodiments.
  • the protective screen 18 serves to suppress laser beams which run outside of a safe solid angle range defined by the pinhole opening of the protective screen 18 as immediately as possible after being emitted by the laser light source 12.
  • a photoluminescent element 20 is arranged in such a way that the primary light bundle 14 strikes the photoluminescent element 20. This is excited to photoluminescence by the laser light of the primary light bundle 14 and, if necessary, scatters part of the laser light of the primary light bundle diffusely.
  • the impinging primary light bundle 14 therefore causes the photoluminescent element 20 to emit a secondary light distribution 22 which fills a secondary solid angle area which is significantly larger than the primary solid angle area.
  • the light of the secondary light distribution 22 is preferably incoherent, polychromatic or white and in particular no longer has the potentially dangerous properties of laser light.
  • An emission optics device 24 embodied as a reflector in the example shown, is used to convert the light bundles of the secondary light distribution 22 into an emission light distribution 26 (here: to deflect), which is essentially concentrated around a main emission direction 28 of the lighting device 10.
  • the photoluminescent element 20 If, in the case of the lighting device 10, the photoluminescent element 20 is removed from its position shown, for example due to mechanical influences, an accident or an assembly error, the laser light of the primary light bundle 14 strikes the emission optics device 24 (reflector) along the primary emission direction 16 and is included in the emission light distribution 26 deflected. In such an incident, the lighting device 10 would therefore contain potentially dangerous, high-intensity laser beams in the light distribution 26.
  • the illustrated lighting device 40 has an emission inhibitor 30 which is designed and arranged in such a way that a transformation into the emission light distribution 26 is suppressed for those light bundles which, starting from the laser light source 12, run in the primary emission direction 16 or a small primary solid angle range around the primary emission direction 16.
  • the reflector-designed radiation optics device 24 of the lighting device 40 has a hole 42 in the reflector surface at the location at which the light bundles running in the primary radiation direction 16 or in the small primary solid angle area around the primary radiation direction 16 hit the reflector surface of the radiation optics device 24 to meet.
  • the light bundles impinging in the area of the hole 42 are therefore not deflected by the emitting optics device 24 into the emitted light distribution 26, which has a negligible influence on the emitted light distribution 26 due to the extended and more divergent nature of the secondary light distribution 22.
  • the Figure 3 shows the lighting device 40 in a damaged state in which the photoluminescent element 20 is no longer arranged in the beam path of the primary light bundle 14.
  • the primary light bundle 14 is planted in the primary emission direction 16 (or in Place in the reflector surface of the emitting optics device 24, in which the primary light bundle 14 spreading in the primary solid angle range around the primary emission direction 16 hits the emitting optics device 24, a deflection of the laser light into the emitted light distribution 26 of the lighting device 40 is prevented.
  • the extent of the hole 42 is at least dimensioned in such a way that all or most of the light rays propagating from the laser light source 12 into the primary solid angle range around the primary emission direction 16 pass through the hole 42 and are therefore not deflected by the emission optics device 24.
  • the Figure 4 shows an illumination device 50.
  • the radiation optics device 24 has a reflector surface on which a facet element 52 is provided.
  • the facet element 52 is arranged on the reflector surface of the emitting optics device 24 in such a way that light beams propagating around the primary emission direction 16 strike the facet element 52 in a primary solid angle range.
  • the facet element 52 is designed such that the incident light beams are directed into an area facing away from the main emission direction 28 of the lighting device 50 and thus do not contribute to the emission light distribution of the lighting device 50.
  • the facet element 52 thus acts as an emission inhibitor 30.
  • the lighting device 50 can have an absorber element 56 or some other device acting as a light trap.
  • the absorber element 56 is preferably arranged such that for
  • the lighting device 50 can have an absorber element 56 or some other device acting as a light trap.
  • the absorber element 56 is preferably arranged in such a way that the associated stray light bundle 54 hits the absorber element 56 for all light beams deflected by the facet element 52.
  • the radiation inhibitor 30 is formed by an absorbent screen 62, for example. This is arranged and dimensioned in its extension in such a way that such light bundles are absorbed by the diaphragm 62, which, starting from the laser light source 12, run in a primary solid angle range around the primary emission direction 16.
  • the diaphragm 62 is arranged in the beam path between the laser light source 12 and the emitting optics device 24, the diaphragm 62 being spaced apart from both the emitting optics device 24 and from the laser light source 12.
  • the diaphragm 62 is arranged on the emitting optics device 24 and there absorbs the undesired light bundles before being deflected into the emitted light distribution.
  • a photoluminescent element 20 arranged in the beam path of the primary light bundle 14 is again absent.
  • An undesired deflection of laser beams into the emitted light distribution is, however, suppressed by the diaphragm 62.
  • the diaphragm 62 is preferably also arranged in such a way that it is spaced apart from the photoluminescent element 20 when this is arranged in the beam path of the primary light bundle 14 as provided.
  • the radiation optics device 24 comprises a projection lens or is formed by this.
  • the radiation optics device can also comprise combinations of projection lens and reflector or of several projection lenses and / or several reflectors.
  • the Figure 6 shows an illumination device 70 with an emission optics device 24 designed as a projection lens 74 From the laser light source 12, a primary light bundle of laser light 14 hits the photoluminescent element 20 and causes this to emit a secondary light distribution 22 in the manner described above. This is projected into the emitted light distribution 26 via the projection lens 74.
  • the projection lens 74 has, as light passage surfaces, a light entry face 75a through which light bundles from the secondary light distribution 22 can enter the projection lens 74, and a light exit face 75b through which light bundles can exit from the projection lens 74.
  • an entry position 76 is defined as that area in which a light bundle extending from the laser light source 12 in the primary emission direction 16 (or a primary solid angle area around this primary emission direction 16) strikes the emission optics device 24 (projection lens 74) for the first time.
  • the light entry surface 75a has a screen 72 for absorbing light rays. It is also conceivable that the light entry surface 75a in the entry position 76 has a light scattering element by means of which potentially dangerous laser light can be converted into harmless scattered light.
  • the diaphragm 72 forms an emission inhibitor 30, since the diaphragm 72 suppresses the transformation into the emitted light distribution 26 for those light bundles which run in the primary solid angle region around the primary emission direction 16.
  • the photoluminescent element 20 is no longer in the beam path of the primary light bundle 14 due to a fault, the potentially harmful laser light of the primary light bundle 14 is absorbed by the diaphragm 72.
  • the projection lens 74 can also have a corresponding diaphragm or a corresponding light scattering element on its light exit surface 75b. This is arranged at the exit position 78, in which light rays emerge from the projection lens 74, which starting from the laser light source 12 in the primary solid angle range around the Primary emission direction 16 extending over the light entry surface 75 were coupled into the projection lens 74.
  • the diaphragm or the light scattering element is arranged and dimensioned in such a way that the reshaping (projection) into the emitted light distribution 26 is suppressed for all those light beams which, starting from the laser light source 12, are attributable to primary light bundles running around the primary emission direction 16 in the primary solid angle range are.
  • a protective screen 80 designed as a perforated screen is provided in the lighting device 70 (conceivable for all embodiments of the invention).
  • the protective screen 80 has a screen opening which is designed in such a way that light bundles are absorbed which run outside a safe solid angle range around the primary radiation direction 16. This can prevent harmful laser beams from reaching the emitted light distribution 26 via the projection lens 74 in the event of a misalignment of the laser light source 12 with respect to the photoluminescent element 20.
  • the lighting device 90 has the radiation optics device 24, which in turn is designed as a projection lens 74, has a deflecting prism 92 on its light exit surface 75b.
  • the deflecting prism 92 is integrally formed on the projection lens 74.
  • the deflecting prism 92 is designed and dimensioned in such a way that such light bundles running in the projection lens 74, which can be traced back to light bundles running from the laser light source 12 in a primary solid angle range around the primary emission direction 16, can be deflected into a stray light distribution 94.
  • this stray light distribution 94 spreads essentially perpendicular to the main emission direction 28 of the lighting device 90. Therefore, the stray light distribution 94 does not contribute to the radiated light distribution.
  • the photoluminescent element 20 is shown in the beam path starting from the laser light source 12 (e.g. due to an accident or a design fault)
  • the laser light of the primary light bundle 14 is deflected after entering the light entry surface 75a into the projection lens 74 by the deflecting prism 92 into the stray light distribution 94 and is therefore not included in the emitted light distribution of the lighting device 90.
  • the deflecting prism 92 therefore acts as a radiation inhibitor in the above-mentioned sense.
  • the deflecting prism 92 can have a deflecting surface and / or a light exit surface with a convex or concave curvature, which is selected such that the stray light distribution 94 is divergent in such a way that no potentially dangerous light intensities occur.

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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)

Claims (5)

  1. Dispositif d'éclairage de véhicule à moteur (70, 90), comprenant : une source de lumière laser (12) pour l'émission d'un faisceau lumineux primaire (14) dans une plage d'angle solide primaire autour d'une direction de rayonnement primaire (16) ; un élément de photoluminescence (20), lequel est disposé de telle sorte que le faisceau lumineux primaire (14) pouvant être émis avec la source de lumière laser (12) vient frapper l'élément de photoluminescence (20), et lequel est réalisé de telle sorte qu'une distribution de lumière secondaire (22) peut être émise à travers le faisceau lumineux primaire (14) incident en mettant à profit la photoluminescence ; un système optique rayonnant (24, 74), lequel est réalisé de telle sorte que la distribution de lumière secondaire (22) peut être transformée en une distribution de lumière rayonnée (26) du dispositif d'éclairage ; un moyen d'inhibition de rayonnement (30, 92), lequel est réalisé et disposé de telle sorte que la transformation en la distribution de lumière rayonnée (26) peut être supprimée pour les faisceaux lumineux qui s'étendent dans la plage d'angle solide primaire autour de la direction de rayonnement primaire (16), caractérisé en ce que le moyen d'inhibition de rayonnement (30) comprend un prisme de déviation (92), lequel est réalisé de telle sorte qu'un faisceau lumineux incident et s'étendant à travers le prisme de déviation (92) peut être dévié de telle sorte qu'il ne contribue pas à la distribution de lumière rayonnée (26), dans lequel le prisme de déviation (92) est disposé sur le système optique rayonnant (24, 74).
  2. Dispositif d'éclairage selon la revendication 1, caractérisé en ce que le moyen d'inhibition de rayonnement (30) est disposé sur le système optique rayonnant (24, 74) dans une position d'entrée (76), dans laquelle un faisceau lumineux s'étendant dans la plage d'angle solide primaire autour de la direction de rayonnement primaire (16) vient frapper le système optique rayonnant (24, 74) pour la première fois.
  3. Dispositif d'éclairage selon la revendication 1 ou 2, caractérisé en ce que le moyen d'inhibition de rayonnement (92) est disposé sur le système optique rayonnant (24, 74) dans une position de sortie, dans laquelle un faisceau lumineux s'étendant dans la plage d'angle solide primaire autour de la direction de rayonnement primaire (16), après être venu frapper le système optique rayonnant (24, 74), sort de celui-ci.
  4. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, caractérisé en ce que le système optique rayonnant (24) comprend une lentille de projection (74), dans lequel le moyen d'inhibition de rayonnement (30) est réalisé en tant que prisme de déviation (92), lequel est formé d'une seule pièce sur une surface de passage de lumière (75a, 75b) de la lentille de projection (74).
  5. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un écran de protection (18, 80), lequel est réalisé de telle sorte que les faisceaux lumineux, lesquels s'étendent à l'extérieur d'une plage d'angle solide de sécurité autour de la direction de rayonnement primaire (16), sont absorbés ou réfléchis, est prévu dans le trajet optique entre la source de lumière laser (12) et l'élément de photoluminescence (20) et/ou dans le trajet optique entre l'élément de photoluminescence (20) et le système optique rayonnant (24, 74).
EP13788933.3A 2012-11-09 2013-10-31 Dispositif d'éclairage de véhicule Active EP2917635B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012220472.5A DE102012220472A1 (de) 2012-11-09 2012-11-09 Kfz.-Beleuchtungsvorrichtung
PCT/EP2013/072828 WO2014072227A1 (fr) 2012-11-09 2013-10-31 Dispositif d'éclairage de véhicule

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EP2917635B1 true EP2917635B1 (fr) 2020-11-25

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DE102016101192A1 (de) 2016-01-25 2017-07-27 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
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CZ309003B6 (cs) 2017-01-24 2021-11-18 Varroc Lighting Systems, s.r.o. Světelné zařízení, zejména projektorový systém světlometu pro motorová vozidla
DE102018113283A1 (de) * 2018-06-05 2019-12-05 HELLA GmbH & Co. KGaA Beleuchtungsvorrichtung für ein Kraftfahrzeug, insbesondere Scheinwerfer
EP3819534A1 (fr) * 2019-11-08 2021-05-12 ZKW Group GmbH Dispositif d'éclairage pour un phare de véhicule automobile
CZ2019768A3 (cs) 2019-12-12 2021-06-30 Varroc Lighting Systems, s.r.o. Osvětlovací zařízení vozidla s laserovým zdrojem záření

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DE102012220472A1 (de) 2014-05-15
WO2014072227A1 (fr) 2014-05-15

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