EP3329179B1 - Dispositif d'illumination pour un phare de véhicule - Google Patents

Dispositif d'illumination pour un phare de véhicule Download PDF

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Publication number
EP3329179B1
EP3329179B1 EP16750359.8A EP16750359A EP3329179B1 EP 3329179 B1 EP3329179 B1 EP 3329179B1 EP 16750359 A EP16750359 A EP 16750359A EP 3329179 B1 EP3329179 B1 EP 3329179B1
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EP
European Patent Office
Prior art keywords
light
lighting device
guiding
row
guiding 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.)
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Application number
EP16750359.8A
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German (de)
English (en)
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EP3329179A1 (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
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ZKW Group GmbH
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Publication of EP3329179A1 publication Critical patent/EP3329179A1/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
    • F21S41/20—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 a respective light exit surface, wherein the light guide in at least one row are arranged, wherein the light-guiding elements are arranged in at least one row, and the light-guiding elements of at least one row are formed as high-beam light-guiding elements and form a high beam row, each high-beam Lichtleitelement each comprises a lower Lichtleitization.
  • 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 emitters are very flexible in terms of light distribution because for each pixel, i. 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, this creates disturbing inhomogeneities in areas of the light image in which a uniform, concentrated and directed illumination desired is, as for example in the high beam distribution.
  • the US 8,011,803 B2 relates to a fog lamp, the collimating 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.
  • the DE 2009 053 581 B3 refers to the primary optics of a matrix / pixel module.
  • the frontal exit surface of the optic is provided with a wavy padding structure.
  • the DE 10 2008 005 488 A1 discloses a fine structure surface for the optical unit having 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.
  • the DE 10 2010 027 322 A1 describes refractive micro-optic components at the light exit surface of a primary optic.
  • the EP 2 587 125 A2 discloses microstructures on the light exit surface of the primary optics of a pixel headlamp.
  • the US 5,727,108 discloses prismatic boundary surfaces for compound parabolic concentrator (CPC) alignment optics.
  • the US 2015/0131324 A1 discloses a lighting device for a headlamp, with light-guiding elements, which are arranged in a row and form a high beam row.
  • a lighting device for headlamps of the type mentioned which is inventively characterized in that the lower Lichtleit Structure at least in the region in which the light beams are reflected, at least partially structures, wherein the structures in that region of the lower light guide surface, which is adjacent to the light exit surface and in which the light is reflected, are formed, and that the structures are groove-shaped , wherein the grooves are oriented transversely to an optical axis of the lighting device and have a width of 0.2-0.4 mm and a height of 0.015-0.03 mm.
  • 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 light emitted by the light source and light coupled into the light guide is expediently totally reflected by the lower light guide surface.
  • the grooves formed on the lower light guiding surface have a periodic geometry.
  • 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 upper row may be formed as a leading 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
  • 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 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 ) are each part of the common light exit surface 23 ', wherein individual light exit surfaces 23 adjoin one another.
  • 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 a per se known per se LED light source 100 (see FIG. Fig. 7 ). 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-guiding 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 guide elements 11 are on their lower light guide surface 24 (see Fig. 7 ) are provided 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 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 expand in the light emission direction, 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 ) is limited.
  • Fig. 4 shows a side view of a high-beam light guide 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 11'.
  • the light is conducted forward along the high-beam light-conducting element 11 '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 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 ray tracing simulation with a luminous intensity sensor, wherein a grayscale image is obtained in accordance with the luminous intensity) of a high-beam light-conducting element 11 ' Fig. 4 ,
  • an intensity maximum 31 can be detected;
  • Fig. 6 shows an intensity curve of the luminous intensity distribution Fig. 5 in which the counter-rise 33 is clearly visible.
  • the cause of the inhomogeneity lies in particular in the transition and the insufficient overlap between the directly emitted light 50 and the light 51 reflected at the lower light guide surface 24.
  • Fig. 7 shows a side view of a high beam light guide element 11 according to the invention.
  • the high-beam light guide 11 according to the invention differs from that of the prior art (high-beam light guide 11 ', see Fig. 4 ) in that groove-shaped structures 25 are formed on the lower light guide surface 24 in the region in which the beams 52 are reflected.
  • the remaining structure of the high-beam light-guiding element 11 corresponds to that of the Fig. 4 and reference is made to the description above.
  • Fig. 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 ray tracing 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 Fig. 7 ,
  • the intensity maximum 31 can be detected;
  • a continuous drop in intensity is generally recognizable and the light image is much more homogeneous compared to the prior art.
  • Fig. 9 shows an intensity curve of the luminous intensity distribution Fig. 8 from which the continuous intensity drop and the improved homogeneity (in 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 Fig. 10 (in Fig. 10 indicated by a dashed circle).
  • 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. This process must be repeated for each groove, since the distance from the light source (LED light source 100) determines the angle of incidence on the support curve and thus the location of the inhomogeneity.
  • 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.

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  • 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)

Claims (9)

  1. Dispositif d'éclairage (1) pour un phare, en particulier un phare de véhicule automobile, comportant une pluralité de sources de lumière (100), un dispositif (10) de guidage de lumière ayant une pluralité d'éléments de guidage de lumière (11, 12, 13) et un élément optique d'imagerie (200) en aval, chaque élément de guidage de lumière (11, 12, 13) présentant une face d'entrée de lumière et une face de sortie de lumière, les éléments de guidage de lumière (11, 12, 13) étant disposés en au moins une rangée, et les éléments de guidage de lumière d'au moins une rangée étant configurés en tant qu'éléments de guidage de lumière de faisceau de route (11) et formant une rangée de faisceau de route, chaque élément de guidage de lumière de faisceau de route (11) comportant une face de guidage de lumière inférieure (24),
    caractérisé par le fait que
    la face de guidage de lumière inférieure (24) présente, au moins dans la région dans laquelle les faisceaux lumineux (52) sont réfléchis, des structures (25) au moins par régions, les structures (25) étant formées dans la région de la face de guidage de lumière inférieure (24) qui est adjacente à la face de sortie de lumière (23) et dans laquelle la lumière est réfléchie, et par le fait que les structures (25) sont réalisées sous forme de cannelures, les cannelures (25) étant orientées transversalement à un axe optique (16) du dispositif d'éclairage et présentant une largeur de 0,2-0,4 mm et une hauteur de 0,015-0,03 mm.
  2. Dispositif d'éclairage selon la revendication 1, caractérisé par le fait que la face de guidage de lumière inférieure (24) réfléchit totalement les faisceaux lumineux entrants.
  3. Dispositif d'éclairage selon l'une des revendications 1 ou 2, caractérisé par le fait que les cannelures (25) possèdent une géométrie périodique.
  4. Dispositif d'éclairage selon l'une des revendications 1 à 3, caractérisé par le fait qu'à partir de la face de sortie de lumière, 6-15 cannelures (25) sont formées sur la face de guidage de lumière inférieure (24).
  5. Dispositif d'éclairage selon l'une des revendications 1 à 4, caractérisé par le fait que les éléments de guidage de lumière (11, 12, 13) sont disposés en exactement trois rangées disposées l'une au-dessus de l'autre, qui forment ensemble une distribution de faisceau de route.
  6. Dispositif d'éclairage selon la revendication 5, caractérisé par le fait que la rangée la plus inférieure (11) est la rangée de faisceau de route.
  7. Dispositif d'éclairage selon l'une des revendications 1 à 4, caractérisé par le fait que tous les éléments de guidage de lumière sont réalisés en tant qu'éléments de guidage de lumière de faisceau de route, qui sont disposés en exactement une rangée.
  8. Dispositif d'éclairage selon l'une des revendications 1 à 7, caractérisé par le fait que les faces de sortie de lumière (23) des éléments de guidage de lumière (11, 12, 13) font partie d'une face de sortie de lumière commune (23'), les faces de sortie de lumière individuelles (23) étant adjacentes l'une à l'autre.
  9. Phare de véhicule automobile comportant un dispositif d'éclairage (1) selon l'une des revendications 1 à 8.
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 EP3329179A1 (fr) 2018-06-06
EP3329179B1 true EP3329179B1 (fr) 2019-05-01

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ID=56681897

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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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Publication number Publication date
CN107850282A (zh) 2018-03-27
WO2017015684A1 (fr) 2017-02-02
AT517523B1 (de) 2017-09-15
AT517523A1 (de) 2017-02-15
EP3329179A1 (fr) 2018-06-06
US20180128443A1 (en) 2018-05-10
CN107850282B (zh) 2020-06-23
JP6481054B2 (ja) 2019-03-13
US10018317B2 (en) 2018-07-10
JP2018520483A (ja) 2018-07-26
AT517523A9 (de) 2017-05-15

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