EP3376096B1 - Leuchtvorrichtung, insbesondere zur beleuchtung und/oder signalisierung für kraftfahrzeug - Google Patents

Leuchtvorrichtung, insbesondere zur beleuchtung und/oder signalisierung für kraftfahrzeug Download PDF

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Publication number
EP3376096B1
EP3376096B1 EP18161327.4A EP18161327A EP3376096B1 EP 3376096 B1 EP3376096 B1 EP 3376096B1 EP 18161327 A EP18161327 A EP 18161327A EP 3376096 B1 EP3376096 B1 EP 3376096B1
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EP
European Patent Office
Prior art keywords
light
light source
source
optic
forming
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EP18161327.4A
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English (en)
French (fr)
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EP3376096A1 (de
Inventor
Pierre Albou
Vincent Godbillon
Jean-Claude Puente
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Valeo Vision SAS
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Valeo Vision SAS
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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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • 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
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F21S43/145—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • 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
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/12—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
    • 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
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to the field of lighting and / or signaling, in particular for motor vehicles. It relates more particularly to a light device comprising a light source, a reflector and an optical system for shaping the rays thus emitted and deflected, arranged in relation to each other for the formation of a light beam in accordance with the regulations.
  • divergent lens is thus associated with light modules in which one does without an element commonly used elsewhere, namely a cover, or bender, which can allow the creation of a cut-off beam whose edge corresponds to the shape of an edge of said cover.
  • a cover or bender
  • the lens is associated with existing sources of the filament, Xenon or Led type, one undergoes the shape and size of the source, generally square or rectangular, so that one can only obtain a beam with flat cut-off.
  • the document WO2017 / 025445 discloses a light device according to the preamble of claim 1.
  • the present invention is part of this search for a particularly compact light device capable of generating a cut-off beam. It aims to provide a light device of simple design, limiting the number of components inside the device.
  • the invention proposes in this context a light device, in particular for lighting and / or signaling for a motor vehicle, comprising a controlled light source for producing the emission of light rays, as well as a collecting optic, arranged opposite the light source to deflect the light rays emitted, and a ray shaping optics for the emission of a light beam outside the device.
  • the reflector By collecting optics is meant in particular a reflector or a lens, the reflector having the advantage of being able to reduce the axial bulk.
  • the collecting optics may consist of a reflector of elliptical or pseudo-elliptical shape, the internal face of which forms a face for reflecting the emitted light rays facing the first face of the substrate of the light source.
  • the light device as just described can in particular be used for lighting a motor vehicle by a beam capable of taking the form of a cut-off beam, the collecting optics and the diverging lens being configured so as to form the beam, with or without interruption after refraction by the lens of the rays emitted by the source and deflected by the collecting optics.
  • the light device thus makes it possible to carry out lighting and / or signaling functions such as low beam, fog light, and / or the “turn code”.
  • the cut-off edge of the cut-off beam can be generated by light rays emitted from an edge of the light source with electroluminescent elements; and this cut-off edge of the cut-off beam can be generated by light rays emitted from an edge of the light source with electroluminescent elements configured to emit rays of high luminance.
  • high luminance is meant rays whose luminance is stronger than the luminance of the rays of a neighboring area.
  • a light device 1 in particular for the lighting and / or signaling of a motor vehicle, comprises a light source 2, in particular housed in a housing closed by a crystal and which defines an internal reception volume 3, shown diagrammatically on the figure 1 , from this light source.
  • the light device further comprises a collecting optic 4, forming an element for deflecting the light rays emitted by the light source 2 and a shaping optic 6.
  • the device is configured so that the shaping optic 6 is adapted to infinitely image the light source by deflection of at least part of the light rays emitted by this light source.
  • the light source 2 is arranged on a frame 7, forming means for exchanging the heat emitted by the light source.
  • the collecting optic 4 here taking the form of an elliptical reflector, is also arranged on the frame 7, overlapping the light source.
  • the frame 7 also supports means for supplying electricity to the source, not shown here, for supplying and activating the electroluminescent elements of the light source.
  • the shaping optic 6 is centered on an optical axis 60 of the light device according to the invention, on which is further arranged the light source.
  • the light source 2 is centered transversely on the optical axis 60 (as visible on the figure 2 ) and it is arranged vertically so that the optical axis passes up to the emissive elements making up this light source. It is understood that in an alternative embodiment, the source can be entirely disposed on one side of this optical axis.
  • the light source 2 is oriented so that the rays it emits are directed mainly towards the ray deflection element 4, a cover here not shown that can be placed in the vicinity of the light source to block rays which would leave towards the shaping optics without first contacting the element of deviation.
  • a cover would in practice be substantially vertical and disposed near the source, between the source and the shaping optics.
  • the light source 2 comprises a plurality of electroluminescent elements 8, of submillimetric dimensions, which are arranged projecting from a substrate 10 so as to form here rods of hexagonal section.
  • the electroluminescent elements extend perpendicular to the substrate and perpendicular to the optical axis of the device, in proximity to the deflection element 4 of the rays.
  • the optical axis is located halfway up the average height of the electroluminescent elements equipping this light source 2.
  • the source can also be placed under the axis which would then pass in the vicinity of the upper emitting surface formed in the vicinity of the free end of the electroluminescent elements, if necessary in the vicinity of an upper surface of a material of wavelength conversion.
  • electroluminescent elements 8 can be grouped, in particular by electrical connections specific to each set, into a plurality of zones.
  • an electrical connection of the sticks can be noted such that three sets of sticks are formed, among which at least a first set 81, a second set 82 and a third set 83 which will be described in more detail below.
  • the frame 7 plays the role of a support element for the light source 2 and that of a cooling device associated with the light source, the light source with electroluminescent elements being glued here. on this cooling device.
  • the light source can be soldered onto a printed circuit board, itself assembled to the frame forming a radiator, optionally by an adhesive which is a good heat conductor.
  • the ray deflection element 4 in the example illustrated has the form of an elliptical reflector, or at least configured elliptically, that is to say having two optical focal points such as the rays passing through the first focus before their deflection by the reflector pass through the second focus after their deflection.
  • first focal point F1 is meant, where appropriate, a plurality of first focal points, and in an optimized solution a line of first focal points corresponding to an edge of the source, and that by second focal point F2, is understood where appropriate a curved plane line as shown on the figure 2 .
  • the light source 2 is arranged on the first focus F1 of the reflector, while the shaping optic 6 is arranged as a function of the position of the second focus F2 of the reflector as will be described below in more detail. It is understood that the internal face of the reflector forms a reflection face of the emitted light rays facing the first face of the substrate of the protruding light source from which the light-emitting sticks are arranged.
  • the shaping optic 6 takes the form of a divergent lens, as illustrated diagrammatically on the figure 1 .
  • the divergent lens is arranged on the optical axis 60 of the light device so that its object focus F is common to the second focus F2 of the reflector.
  • the advantage of such arrangements will be described below, in particular by referring to the paths of the light rays illustrated on the Figures 1 and 2 .
  • the components of the light device that are the source, the reflector and the divergent lens are arranged relative to this optical axis 60 of the light device, so that the light source is arranged at least partially on this axis, that the reflector has focal points positioned on this axis and that the divergent lens is centered on this axis.
  • a semiconductor light source 2 comprising electroluminescent elements of submillimetric dimensions, in the form of rods, in particular with reference to the figure 3 .
  • the light source 1 comprises a plurality of electroluminescent rods 8 which arise on a first face of a substrate 10.
  • Each electroluminescent rod here formed by the use of gallium nitride (GaN)
  • GaN gallium nitride
  • the light-emitting sticks could be made from an alloy of aluminum nitride and gallium nitride (AlGaN), or from an alloy of aluminum phosphides, indium and gallium (AllnGaP).
  • the substrate 10 has a lower face 12, on which a first electrode 14 is attached, and an upper face 16, projecting from which extend the light-emitting rods 8, playing the role of the first face of the substrate mentioned above, and on which is attached a second electrode 18.
  • Different layers of materials are superimposed on the upper face 16, in particular after the growth of the light-emitting rods from the substrate here obtained by a bottom-up approach.
  • This layer is etched so as to connect such and such a stick to each other, the lighting of these light-emitting sticks can then be controlled simultaneously by a control module not shown here. Provision may be made for at least two light-emitting sticks or at least two groups of light-emitting sticks to be arranged to be lit separately by means of an ignition control system.
  • the light emitting sticks stretch from the substrate and, as seen on the figure 3 , they each comprise a core 19 of gallium nitride, around which are arranged quantum wells 20 formed by a radial superposition of layers of different materials, here gallium nitride and gallium-indium nitride, and a shell 21 surrounding the quantum wells also made of gallium nitride.
  • Each electroluminescent rod extends along an elongation axis 22 defining its height, the base of each rod being disposed in a plane 24 of the upper face 16 of the substrate 10.
  • the light-emitting sticks 8 of the same light source advantageously have the same shape. They are each delimited by an end face 26 and by a circumferential wall 28 which extends along the axis of elongation of the rod.
  • the resulting light at the output of the semiconductor source is emitted essentially from the circumferential wall 28, it being understood that light rays can also come out of the end face 26.
  • each light-emitting stick acts as a single light-emitting diode and the luminance of this source is improved on the one hand by the density of the light-emitting sticks 8 present and on the other hand by the size of the illuminating surface defined by the circumferential wall and which therefore extends over the entire periphery, and the entire height, of the rod.
  • This circumferential wall 28 extends along the axis of elongation 22 from the substrate 10 to the end face 26, the distance from the end face 26 to the upper face 16 of the substrate, from which the rods originate. 8, defining the height of each stick.
  • an electroluminescent rod 8 is between 1 and 10 micrometers, while it is expected that the largest transverse dimension of the end face, perpendicular to the axis of elongation 22 of the rod concerned, ie less than 2 micrometers. Provision may also be made to define the surface of a rod, in a cutting plane perpendicular to this elongation axis 22, within a range of determined values, and in particular between 1.96 and 4 square micrometers.
  • the height can be modified from one zone of the light source to another, so as to increase the luminance of the corresponding zone when the average height of the rods constituting it is increased.
  • a group of light-emitting sticks can have a height, or heights, different from another group of light-emitting sticks, these two groups being constitutive of the same semiconductor light source comprising light-emitting sticks of submillimetric dimensions.
  • the light-emitting rods 8 of two rows have an average height greater than the average height of the other rods. It will be described below how these rods, here two rows, form a first assembly advantageously arranged in the vicinity of an edge of the light source arranged at the first focus F1 of the reflector.
  • the shape of the light-emitting sticks 8 can also vary from one device to another, in particular on the section of the sticks and on the shape of the end face 26.
  • the sticks have a generally cylindrical shape, and they can in particular, such as illustrated on the figure 3 , present a shape of polygonal, and more particularly hexagonal, section. We understand that it is important that light can be emitted through the circumferential wall, whether the latter has a polygonal or circular shape.
  • the end face 26 may have a substantially planar shape and perpendicular to the circumferential wall, so that it extends substantially parallel to the upper face 16 of the substrate 10, as illustrated in the figure 3 , or it may have a domed or pointed shape at its center, so as to multiply the directions of emission of the light leaving this terminal face.
  • the semiconductor light source 2 may further comprise a layer of a polymeric material in which the light-emitting rods are at least partially embedded.
  • the polymer material which can in particular be based on silicone, creates a protective layer which makes it possible to protect the light-emitting sticks without hampering the diffusion of the light rays.
  • wavelength conversion means capable of absorbing at least part of the rays emitted by one of the rods and of converting at least part of said excitation light absorbed into emission light having a wavelength different from that of the excitation light. It is equally possible to provide that the wavelength conversion means are embedded in the mass of the polymer material, or else that they are arranged on the surface of the layer of this polymer material.
  • the light source may further comprise a coating of light-reflecting material which is arranged between the light-emitting rods 8 to deflect the rays, initially oriented towards the substrate, towards the end face 26 of the light-emitting rods 8.
  • the upper face 16 of the substrate 10 may include a reflecting means which returns the light rays, initially oriented towards the upper face 16, towards the exit face of the light source. We thus recover rays that would otherwise be lost.
  • This coating is placed between the light-emitting rods 8 on the transparent conductive oxide layer 29.
  • the light-emitting sticks 8 are arranged in a two-dimensional matrix. This arrangement could be such that the sticks are staggered.
  • the rods are arranged at regular intervals on the substrate 10 and the separation distance of two immediately adjacent light-emitting rods, in each of the dimensions of the matrix, must be at least equal to 2 micrometers, so that the light emitted by the circumferential wall 28 of each rod 8 can exit from the matrix of light-emitting rods.
  • these distances of separation measured between two axes of elongation 22 of adjacent rods, are not greater than 100 micrometers.
  • the light-emitting rods of submillimetric dimensions define in a plane, substantially parallel to the substrate, a determined emission surface, which has a substantially rectangular shape with a determined length and width.
  • the terms length and width are used to define the main dimensions of the emission surface formed by the rods in the plane parallel to the substrate.
  • the light source is arranged so that on the one hand the width, or short side, of the rectangular emission surface is parallel to the optical axis and that on the other hand a length, or long side, is centered on this optical axis, it being understood that one could have an eccentric arrangement.
  • the light source in the transverse direction perpendicular to the optical axis in the plane of the substrate, the light source, or at least the emission surface defined by the electroluminescent elements, is arranged symmetrically on the axis optical.
  • the arrangement of the light source will be described below, that is to say along the optical axis.
  • the main dimension of the light source, or at the very least of the emission surface defined by the electroluminescent elements extends transversely, that is to say perpendicularly, to the optical axis.
  • the light source 2 has light-emitting sticks arranged in three selectively activatable assemblies which each have a strip shape, these strips being stacked along the optical axis 60.
  • These bands respectively forming the first set 81, the second set 82 and the third set 83, are separated from their immediate neighbor by a line of demarcation, as is particularly visible on the figure 2 .
  • This line of demarcation between two successive sets here follows the shape of a straight portion, and it will be understood that it could be obtained indifferently by the physical production of a low wall projecting from the substrate, or only produced by the separate electrical connection from rod sets.
  • rods respectively associated with one or the other of the two sets on either side of the dividing line, are electrically connected so that the sets can be activated selectively.
  • the first set 81 has sticks whose average height is greater than the average height of the sticks of the second set 82 and greater than that of the sticks of the third set 83.
  • the light source 1 is arranged so that c 'is the first set 81 which is arranged on the first focus of the deflection element 4 of the rays.
  • the sets of sticks arranged more distant from this first focus have an average height of sticks substantially equal to each other, but less than that of the first set 81, which thus generates a greater luminance than the other sets of sticks. This results in a light source which has a variable luminance along the direction of the optical axis.
  • each of the electroluminescent elements so that the first set 81 of sticks has a greater luminance of 3 to 4 times the average luminance of the other sets of sticks.
  • control elements associated with the light source 2 are configured to control the activation of the first set 81 distinctly from that of the second 82 and / or the third 83 together.
  • the elliptical reflector has a first focal point on which the light source is positioned, and more particularly the longitudinal end edge corresponding to the first set of rods, and a second focal point merged with the focal point of the divergent lens.
  • This concordant point of the second focus of the reflector and the focus of the diverging lens is located on the other side of the diverging lens with respect to the light source and the reflector.
  • the divergent lens is positioned between the first and second focal points of the reflector.
  • the first rays (represented on the figure 1 by lines with a single arrow) are emitted from the first set 81 of rods 8, that is to say from the zone of the light source substantially located on the first focus of the reflector. This results in a deviation of the rays emitted towards the second focus of the reflector, the latter being elliptical or at least configured to respect this principle of elliptical bifocal reflection. These rays, before reaching the second focus of the reflector, arrive on the divergent lens.
  • Second rays (represented on the figure 1 by double arrow lines) are emitted from the second or third set of rods 8, corresponding to an area of the light source located downstream of the first focus of the reflector, that is to say located between the first focus and the second focus of the reflector. This results in deflected rays which would cause the optical axis to cut upstream of the second focus of the reflector, in the absence of a lens, as also illustrated on the figure 2 . These rays, before reaching this theoretical focal point, arrive on the divergent lens.
  • the reflector is adapted to project the image of the very bright part of the source opposite to the divergent lens, in the vicinity of the focal point of this divergent lens, so that the corresponding rays emerge parallel to the optical axis by forming the cut-off of the beam emitted at the output of the divergent lens.
  • the highest luminance is obtained by a greater average height of the rods 8 of this first set 81, but it will be understood that this high luminance could be obtained differently, by a greater density of sticks for example.
  • a high luminance area is arranged on the rear longitudinal end edge 80 of the light source 2, that is to say the edge of the light source opposite to the diverging lens. As may have been specified previously, this edge having a zone of high luminance is disposed on the first focal point of the elliptical or pseudo-elliptical reflector.
  • the first set 81 of rods of high luminance and arranged in the direct vicinity of the rear longitudinal end edge 80, generates a first part 101 of the projected beam, more intense, and successively, each set of rods, the luminance of which decreases in s moving away from the first set 81 of rods, generates a portion of less and less intense beam, and cutting the optical axis upstream of the second theoretical focus F2, so that they are caused to be projected below the horizon, by closer and closer to the vehicle, when they are corrected by the shaping optics 6 and in particular the diverging lens.
  • control elements associated with the light source control the selective activation of the light-emitting rods present in each of the rod sets.
  • the control of these assemblies can be selective in that the supply intensity of each of the sets of rods varies according to their distance from the longitudinal end edge 80 of the light source 2.
  • a beam of fire type is formed here. crossing, with a cutting edge, it being understood that other types of beam could be produced, in particular by modifying the position of the light source relative to the first focus of the reflector.
  • the present invention applies very particularly to a front headlight of a motor vehicle, and it is integrated in particular into a front face of a vehicle.
  • the modes of implementation apply to light sources comprising both light-emitting sticks extending respectively projecting from the same substrate, as described above, as with emissive blocks obtained by cutting light-emitting layers superimposed on the same substrate, these blocks replacing the sticks.

Claims (15)

  1. Leuchtvorrichtung (1), insbesondere zur Beleuchtung und/oder Signalisierung für ein Kraftfahrzeug, umfassend eine Lichtquelle (2), die angesteuert wird, um das Emittieren von Lichtstrahlen auszuführen, sowie eine Sammeloptik (4), die gegenüber der Lichtquelle angeordnet ist, um die emittierten Lichtstrahlen abzulenken, und eine Strahlformgebungsoptik (6) zum Emittieren eines Lichtbündels aus der Vorrichtung heraus, wobei die Lichtquelle eine Halbleiterquelle ist, die mindestens ein Substrat (10) und eine Mehrzahl von elektrolumineszenten Elementen (8) mit Abmessungen im submillimetrischen Bereich umfasst, die sich von einer ersten Fläche (16) des Substrats aus erstrecken, dadurch gekennzeichnet, dass die Formgebungsoptik (6) eine Zerstreuungslinse ist.
  2. Leuchtvorrichtung (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Sammeloptik ein elliptischer oder pseudoelliptischer Reflektor ist, dessen Innenfläche eine Reflexionsfläche zur Reflexion der emittierten Lichtstrahlen ist, die der ersten Fläche des Substrats der Lichtquelle zugewandt ist.
  3. Leuchtvorrichtung (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Bauteile der Vorrichtung, bei denen es sich um die Quelle (2), die Sammeloptik (4) und die die Formgebungsoptik (6) bildende Zerstreuungslinse handelt, relativ zu einer gemeinsamen Achse, welche die optische Achse (60) der Vorrichtung bildet, derart eingerichtet sind, dass die Quelle zumindest teilweise auf dieser Achse, oder in deren Nähe, angeordnet ist, dass die Sammeloptik Brennpunkte (F1, F2) aufweist, die auf dieser Achse positioniert sind, und dass die Zerstreuungslinse auf diese Achse, oder in deren Nähe, zentriert ist.
  4. Leuchtvorrichtung (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass sich die elektrolumineszenten Elemente (8) senkrecht oder im Wesentlichen senkrecht zur optischen Achse (60) der Vorrichtung erstrecken, unter Annäherung an die Sammeloptik (4).
  5. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche in Kombination mit Anspruch 2, dadurch gekennzeichnet, dass die Lichtquelle (2) im ersten Brennpunkt des die Sammeloptik (4) bildenden elliptischen oder pseudoelliptischen Reflektors eingerichtet ist.
  6. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche in Kombination mit Anspruch 3, dadurch gekennzeichnet, dass die Lichtquelle (2) eine entlang der Richtung der optischen Achse (60) variable Leuchtdichte aufweist.
  7. Leuchtvorrichtung (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass ein Bereich mit hoher Leuchtdichte am Rand (80) der Lichtquelle (2) entgegengesetzt zu der die Formgebungsoptik (6) bildenden Zerstreuungslinse eingerichtet ist.
  8. Leuchtvorrichtung (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Rand (80), der einen Bereich mit hoher Leuchtdichte aufweist, im ersten Brennpunkt (F1) der Sammeloptik (4) angeordnet ist.
  9. Leuchtvorrichtung (1) nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die variable Leuchtdichte der Lichtquelle (2) durch eine Dichte und/oder eine Höhe der elektrolumineszenten Elemente (8) erhalten wird.
  10. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche in Kombination mit den Ansprüchen 2 und 3, dadurch gekennzeichnet, dass die die Formgebungsoptik (6) bildende Zerstreuungslinse auf der optischen Achse (60) der Vorrichtung so angeordnet ist, dass der objektseitige Brennpunkt (F) der Zerstreuungslinse mit dem zweiten Brennpunkt (F2), oder in dessen Nähe, des die Sammeloptik (4) bildenden elliptischen oder pseudoelliptischen Reflektors zusammenfällt.
  11. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche in Kombination mit Anspruch 3, dadurch gekennzeichnet, dass die Lichtquelle (2) eine Hauptabmessung aufweist, wobei diese Quelle so angeordnet ist, dass sich diese Hauptabmessung quer zur optischen Achse (60) der Vorrichtung erstreckt.
  12. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche in Kombination mit Anspruch 2, dadurch gekennzeichnet, dass die Lichtquelle (2) auf die optische Achse (60) der Vorrichtung zentriert ist.
  13. Leuchtvorrichtung (1) nach einem der vorhergehenden Ansprüche zur Beleuchtung eines Kraftfahrzeugs mit einem Bündel mit Hell-Dunkel-Grenze, wobei die Sammeloptik und die Zerstreuungslinse so ausgestaltet sind, dass sie das Bündel mit Hell-Dunkel-Grenze nach Brechung der von der Quelle emittierten und von der Sammeloptik abgelenkten Strahlen durch die Linse bilden.
  14. Leuchtvorrichtung (1) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Begrenzungsrand (100) des Bündels mit Hell-Dunkel-Grenze durch Lichtstrahlen erzeugt wird, die von einem Rand (80) der Lichtquelle (2) mit elektrolumineszenten Elementen aus emittiert werden.
  15. Leuchtvorrichtung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Begrenzungsrand (100) des Bündels mit Hell-Dunkel-Grenze durch Lichtstrahlen erzeugt wird, die von einem Rand (80) der Lichtquelle (2) mit elektrolumineszenten Elementen aus emittiert werden, der dazu ausgestaltet ist, Strahlen mit hoher Leuchtdichte zu emittieren.
EP18161327.4A 2017-03-13 2018-03-12 Leuchtvorrichtung, insbesondere zur beleuchtung und/oder signalisierung für kraftfahrzeug Active EP3376096B1 (de)

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US11335890B2 (en) * 2016-12-19 2022-05-17 Pioneer Corporation Light-emitting device and light-emitting system
DE102018201980A1 (de) * 2018-02-08 2019-08-08 Bayerische Motoren Werke Aktiengesellschaft Beleuchtungsvorrichtung für ein Kraftfahrzeug
JP7263842B2 (ja) * 2019-02-28 2023-04-25 市光工業株式会社 車両用灯具
FR3093788B1 (fr) * 2019-03-14 2022-05-27 Valeo Vision Dispositif lumineux imageant une surface eclairee virtuelle d’un collecteur
WO2024036553A1 (en) * 2022-08-18 2024-02-22 Valeo Vision Luminous module for a motor vehicle

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JP4786420B2 (ja) * 2006-05-31 2011-10-05 株式会社小糸製作所 車両用灯具ユニット
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JP6311440B2 (ja) * 2014-05-12 2018-04-18 市光工業株式会社 車両用前照灯
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EP3376096A1 (de) 2018-09-19
CN108571703A (zh) 2018-09-25
US20180266640A1 (en) 2018-09-20
FR3063795B1 (fr) 2019-04-05
KR20180104577A (ko) 2018-09-21
FR3063795A1 (fr) 2018-09-14
US10533722B2 (en) 2020-01-14
JP2018152341A (ja) 2018-09-27

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