EP3329179A1 - Dispositif d'éclairage destiné à un phare de véhicule à moteur - Google Patents

Dispositif d'éclairage destiné à un phare de véhicule à moteur

Info

Publication number
EP3329179A1
EP3329179A1 EP16750359.8A EP16750359A EP3329179A1 EP 3329179 A1 EP3329179 A1 EP 3329179A1 EP 16750359 A EP16750359 A EP 16750359A EP 3329179 A1 EP3329179 A1 EP 3329179A1
Authority
EP
European Patent Office
Prior art keywords
light
lighting device
light guide
row
elements
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
EP16750359.8A
Other languages
German (de)
English (en)
Other versions
EP3329179B1 (fr
Inventor
Lukas Taudt
Josef Plank
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.)
ZKW Group GmbH
Original Assignee
ZKW Group 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 ZKW Group GmbH filed Critical ZKW Group GmbH
Publication of EP3329179A1 publication Critical patent/EP3329179A1/fr
Application granted granted Critical
Publication of EP3329179B1 publication Critical patent/EP3329179B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel 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
    • 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 a lighting device for a headlight, in particular a motor vehicle headlight, comprising a plurality of light sources, a light guide with a plurality of light guide elements and a downstream imaging optical element, each light guide each having a light input surface and one light exit surface, wherein the light guide in at least one row are arranged.
  • Such lighting units which are also referred to as pixel light modules, are common in the automotive industry and serve, for example, the imaging of glare-free high beam by the light is usually emitted by a plurality of artificial light sources and by a corresponding plurality of juxtaposed light guides (attachment optics / Primary optics) is focused in the emission direction.
  • the light guides have a relatively small cross-section and therefore emit the light of the individual light sources each associated with very concentrated in the emission direction.
  • Pixel light he throw is very flexible in terms of light distribution, since for each pixel, i. E. For every light guide, the illuminance can be controlled individually and any light distribution can be realized.
  • the concentrated radiation of the light guides is desired, for example, to comply with legal requirements regarding the light-dark line of a motor vehicle headlight or implement adaptive flexible Ausblendszenarien, on the other hand, thereby causing disturbing inhomogeneities in areas of the light image in which a uniform, concentrated and directional illumination desired is, as for example in the high beam distribution.
  • the US 8,011,803 B2 relates to a fog lamp, the couimierende attachment optics with attached wavy deflection, which is inclined to the main emission of the LED includes. As a result, on the one hand, the light is deflected but also scattered, so that the homogeneity is improved.
  • DE 2009 053 581 B3 relates to the primary optics of a matrix / pixel module.
  • the frontal exit surface of the optic is provided with a wavy padding structure.
  • DE 10 2008 005 488 A1 discloses a fine structure surface for the optical unit with a plurality of structural elements with which the light spots are widened in the horizontal direction. If the light spots overlap, the edges blur, resulting in a more homogeneous overall light distribution.
  • EP 2 587 125 A2 discloses microstructures on the light exit surface of the primary optics of a pixel headlamp.
  • each high beam light guide each having a lower Lichtleit Formula includes, wherein the lower light guide surface at least in that area in which the light rays are reflected, at least partially having structures.
  • the invention is a technically simple and cost-effective measure to locally influence the light distribution in the respective high-beam light guide elements and thus to realize a more homogeneous high beam distribution.
  • the basic structure of light-guiding elements and attachment optics for pixel light lighting devices for headlights is known per se.
  • the light-guiding elements are made, for example, of plastic, glass or any other suitable materials for light transmission.
  • the light guide elements are made of a silicone material.
  • the light-guiding elements are typically embodied as solid bodies and preferably consist of a single continuous optical medium, wherein the light conduction takes place within this medium.
  • the light-guiding elements typically have a substantially square or rectangular cross section and usually expand in the light emission direction in a manner known per se.
  • the light-guiding elements can be realized as open collimators.
  • the structures are formed in that region of the lower light guide surface which adjoins the light exit surface and in which the light is reflected.
  • the light emitted by the light source and light coupled into the light guide is expediently totally reflected by the lower light guide surface.
  • the structures formed on the lower light guide surface comprise structural elements which have a periodic geometry.
  • the structures are groove-shaped, wherein the grooves are oriented transversely to an optical axis of the lighting device.
  • the grooves may have a width of about 0.2-0.4 mm and a height of 0.015-0.03 mm.
  • the structure of a lighting device for pixel light is particularly efficient when the light-guiding elements are arranged in exactly three rows arranged one above the other, which together form a high beam distribution.
  • the top row may be formed as a front row row, the middle row as an asymmetrical row and the lower row as a high beam row, the high beam row being provided by high beam light guiding elements having structures as described herein.
  • the bottom row is the high beam row.
  • all the light-guiding elements can be designed as high-beam light-guiding elements which are arranged in exactly one row.
  • Such lighting devices are also referred to as pixel high beam modules.
  • the light-conducting elements of the rows are preferably arranged as close as possible to each other, whereby inhomogeneities in the photograph can be further reduced.
  • the light exit surfaces of the individual light guide elements can therefore be part of a common light exit surface, with the individual light exit surfaces adjoining one another.
  • the common light exit surface is typically a curved surface, usually following the Petzval surface of the imaging optics (e.g., an imaging lens).
  • the imaging optics e.g., an imaging lens
  • FIG. 1 Another object of the invention relates to a headlamp, in particular a motor vehicle headlamp, which comprises a lighting device according to the invention as disclosed herein. Headlights of this type are also referred to as pixel light.
  • FIG. 1 is a perspective view of the basic structure of a lighting device according to the invention.
  • FIG. 2 is an illustration of the total light distribution obtained with the lighting device of FIG. 1.
  • FIG. 2 is an illustration of the total light distribution obtained with the lighting device of FIG. 1.
  • FIG. 3 is a detail view of the optical attachment of Figure 1 in the light propagation direction
  • FIG. 5 shows a light intensity distribution (light intensity simulation) of a high-beam light-conducting element from FIG. 4.
  • FIG. 6 shows an intensity curve of the light intensity distribution from FIG. 5, FIG.
  • FIG. 7 shows a side view of a high-beam light-conducting element according to the invention
  • FIG. 8 shows a representation of the light intensity distribution of the high-beam light-conducting element from FIG. 7, FIG.
  • FIG. 11 shows a detail from FIG. 10.
  • Fig. 1 shows a perspective view of the basic structure of a lighting device 1 according to the invention.
  • the attachment optics 10 comprises light guide elements 11, 12, 13, which are arranged in three rows and the radiating side to a common end plate 26 extend.
  • the end plate 26 is the emission side limited by a light exit surface 23 ', wherein the light exit surfaces 23 of the individual light guide elements (see FIG. 7) each part of the common light exit surface 23', wherein individual light exit surfaces 23 adjacent to each other.
  • the common light exit surface 23 ' is typically a curved surface, usually following the Petzval surface of the imaging lens 200. For certain applications, deliberate deviations in the curvature of the common light exit surface 23 'can also be used in order to use aberrations for light homogenization in the edge region.
  • Each light-guiding element 11, 12, 13 is associated with an LED light source 100 (see FIG. 7) in a manner known per se. For each light guide element 11, 12, 13, the illuminance can be controlled individually, which is why arbitrary light distributions can be realized.
  • the upper row is formed as a front row row consisting of a plurality of apron light guide elements 13.
  • the middle row is formed as asymmetry series consisting of a plurality of asymmetry light guide elements 12 and the lower row is formed as a high beam row consisting of a plurality of high beam light-guiding elements 11.
  • the three rows together form a high beam distribution in the activated state.
  • the high-beam light-conducting elements 11 are provided on their lower light-guiding surface 24 (see FIG. 7) with a groove structure 25, wherein the grooves 25 are oriented transversely to an optical axis 16 of the lighting device 1.
  • FIG. 3 shows a detailed view of the attachment optics 10 from FIG. 1 in the light propagation direction.
  • the light-guiding elements 11, 12, 13 can be made, for example, of silicone, plastic, glass or any other suitable materials for light conduction.
  • the light-guiding elements 11, 12, 13 are designed as solid bodies and consist of a single continuous optical medium, wherein the light conduit takes place within this medium.
  • the light-guiding elements 11, 12, 13 have a substantially square or rectangular cross-section and extend in the direction of light emission, where they finally as described above radiation side to the common end plate 26, the emission side by a light exit plane 23 '(see Fig .. 3) limited is lost.
  • the light distribution forms a high beam distribution. Adjacent fields touch or overlap each other, making the light image appear substantially homogeneous to a viewer.
  • FIG. 4 shows a side view of a high-beam light-conducting element 11 'according to the prior art.
  • the high-beam light-conducting element 11 ' is a solid body having a light coupling surface 21, via which the light emitted by the LED light source is coupled into the light-conducting element W. The light is conducted forward along the high-beam light-conducting element W to a light exit surface 23.
  • FIG. 4 also shows exemplary beam paths emanating from the light incoupling surface 21, wherein the beams 50 represent the direct light exit and the beams 51, which are reflected at a lower light guide surface 24, represent the indirect light exit.
  • the upper light guide surface 22 whereas the side of the solid body limiting light guide surfaces are not provided with reference numerals for reasons of representability.
  • the light rays are totally reflected at the light guide surfaces.
  • the lower light guide surface 24 of a prior art high-beam light guide element 11 ' is formed along its entire length as a smooth reflection surface (optimized for the use of total reflection).
  • FIG. 5 shows, by way of example, a luminous intensity distribution 30 (photometric raytracing simulation with a luminous intensity sensor, a grayscale image being obtained in accordance with the luminous intensity) of a high-beam light-conducting element 11 'from FIG. 4.
  • An intensity maximum 31 can be detected in the lower region of the high beam segment; In the upper area of the high beam segment, on the other hand, there is first an intensity drop 32, which leads to a clearly visible inhomogeneity due to a rise 33 of the intensity.
  • FIG. 6 shows an intensity curve of the light intensity distribution from FIG. 5, in which the counter-rise 33 can be clearly seen.
  • FIG. 7 shows a side view of a high-beam light-conducting element 11 according to the invention.
  • the high-beam light guide element 11 according to the invention differs from that of the prior art (high-beam light guide 11 ', see Fig. 4) in that on the lower light guide surface 24 in that region in which the beams 52 are reflected, grooved Structures 25 are formed.
  • the remaining structure of the high-beam light-guiding element 11 corresponds to that of FIG. 4 and reference is made to the description above.
  • the 7 also shows exemplary beam paths emanating from the light incoupling surface 21, wherein the beams 50 represent the direct light exit and the beams 52, which are reflected at the groove structure 25 of the light guide surface 24, represent the indirect light exit.
  • the groove structure 25 scatters and shapes the light 52 precisely in that region which lies in the transition between the directly emitted light 50 and the light 52 reflected at the groove structure 25 of the lower light guide surface 24.
  • the light distribution can be influenced and as a result there is an improvement in the light homogeneity.
  • FIG. 8 shows, by way of example, a luminous intensity distribution 30 '(photometric raytracing simulation with a luminous intensity sensor, a grayscale image being obtained in accordance with the luminous intensity) of a high-beam light-conducting element 11 according to the invention from FIG. 7.
  • the intensity maximum 31 can be detected in the lower region of the high beam segment ; In the upper part of the high beam segment, a continuous drop in intensity is generally recognizable and the light image is much more homogeneous compared to the prior art.
  • FIG. 9 shows a intensity distribution curve of the light intensity distribution from FIG. 8, from which the continuous intensity drop and the improved homogeneity (marked with the reference symbol 34 in FIG. 7) in the transition between the directly emitted light 50 and the light 52 reflected at the groove structure 25 is clearly visible. With the aid of the groove structure, the outlet can be better designed or optimized (see FIG.
  • FIG. 10 shows a vertical section through a high-beam light-conducting element 11 according to the invention.
  • the grooves 25 extend transversely to the optical axis (or light propagation direction) and are formed along a (imaginary) carrier curve TK on the lower light guide surface 24.
  • a total of 9 grooves are formed starting from the light exit surface 23.
  • the grooves 25 have a width of 0.3 mm and a height of 0.015-0.03 mm.
  • FIG. 11 shows a detail of FIG. 10 (indicated by a dashed circle in FIG. 10).
  • An optimized embodiment can be obtained as follows:
  • the carrier curve TK is the boundary of a light-guiding element.
  • the three points Pi, Si, Pi + 1 are the nodes of a spline curve.
  • the magnitude of the amplitude is iteratively varied, with the respective geometry a photometric simulation is carried out according to a conventional manner. By comparing the obtained light images (or the gradient curve), the best amplitude is determined.
  • the boundary surface of the groove itself is an extension surface of the determined spline curve, wherein the extension direction is normal to the vertical center plane of the light guide, and wherein each groove has its own amplitude.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un dispositif d'éclairage (1) destiné à un phare, notamment un phare de véhicule à moteur, comprenant une pluralité de sources lumineuses (100), un dispositif de photoconduction (10) pourvu d'une pluralité d'éléments photoconducteurs (11, 12, 13) et un élément d'imagerie optique (200) monté ultérieurement, chaque élément photoconducteur (11, 12, 13) présentant respectivement une surface d'injection de lumière et respectivement une surface de prélèvement de lumière, les éléments photoconducteurs (11, 12, 13) étant disposés en au moins une rangée, les éléments photoconducteurs d'au moins une rangée étant conçus comme éléments photoconducteurs-feu de route (11) et formant une rangée feu de route, chaque élément photoconducteur-feu de route (11) comprenant respectivement une face photoconductrice (24) inférieure, la face photoconduction photoconductrice (24) inférieure présentant au moins par endroits, au moins dans chaque zone dans laquelle les rayons lumineux (52) sont réfléchis, des structures (25).
EP16750359.8A 2015-07-28 2016-07-18 Dispositif d'illumination pour un phare de véhicule Active EP3329179B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50672/2015A AT517523B1 (de) 2015-07-28 2015-07-28 Leuchteinrichtung für einen KFZ-Scheinwerfer
PCT/AT2016/060008 WO2017015684A1 (fr) 2015-07-28 2016-07-18 Dispositif d'éclairage destiné à un phare de véhicule à moteur

Publications (2)

Publication Number Publication Date
EP3329179A1 true EP3329179A1 (fr) 2018-06-06
EP3329179B1 EP3329179B1 (fr) 2019-05-01

Family

ID=56681897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16750359.8A Active EP3329179B1 (fr) 2015-07-28 2016-07-18 Dispositif d'illumination pour un phare de véhicule

Country Status (6)

Country Link
US (1) US10018317B2 (fr)
EP (1) EP3329179B1 (fr)
JP (1) JP6481054B2 (fr)
CN (1) CN107850282B (fr)
AT (1) AT517523B1 (fr)
WO (1) WO2017015684A1 (fr)

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Also Published As

Publication number Publication date
WO2017015684A1 (fr) 2017-02-02
AT517523A9 (de) 2017-05-15
JP6481054B2 (ja) 2019-03-13
EP3329179B1 (fr) 2019-05-01
AT517523A1 (de) 2017-02-15
US20180128443A1 (en) 2018-05-10
US10018317B2 (en) 2018-07-10
JP2018520483A (ja) 2018-07-26
CN107850282B (zh) 2020-06-23
CN107850282A (zh) 2018-03-27
AT517523B1 (de) 2017-09-15

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