EP2846077A2 - Optique de projection destinée à être utilisée dans un module à DEL d'un phare de véhicule automobile, et module à DEL et phare de véhicule automobile doté d'une telle optique de projection - Google Patents

Optique de projection destinée à être utilisée dans un module à DEL d'un phare de véhicule automobile, et module à DEL et phare de véhicule automobile doté d'une telle optique de projection Download PDF

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Publication number
EP2846077A2
EP2846077A2 EP14180018.5A EP14180018A EP2846077A2 EP 2846077 A2 EP2846077 A2 EP 2846077A2 EP 14180018 A EP14180018 A EP 14180018A EP 2846077 A2 EP2846077 A2 EP 2846077A2
Authority
EP
European Patent Office
Prior art keywords
optics
projection optics
exit surface
light
primary
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
EP14180018.5A
Other languages
German (de)
English (en)
Other versions
EP2846077B1 (fr
EP2846077A3 (fr
Inventor
Emil P Dr. Stefanov
Christian Dr. Buchberger
Markus Kiesel
Martin Licht
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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Filing date
Publication date
Application filed by Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP2846077A2 publication Critical patent/EP2846077A2/fr
Publication of EP2846077A3 publication Critical patent/EP2846077A3/fr
Application granted granted Critical
Publication of EP2846077B1 publication Critical patent/EP2846077B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—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
    • F21S41/10—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
    • F21S41/20—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
    • F21S41/25—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
    • F21S41/20—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
    • F21S41/20—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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—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
    • 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
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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
    • 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
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/155—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having inclined and horizontal cutoff lines
    • 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
    • F21W2102/20—Illuminance distribution within the emitted light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a projection optics for use in an LED module of a motor vehicle headlight.
  • the LED module has a light source in the form of an LED matrix, which comprises a plurality of LED chips arranged side by side and / or one above the other, a primary optics comprising a plurality of primary optics arranged next to and / or above one another, for bundling the of the Light emitted light and the projection optics on.
  • the projection optics project an exit surface of the primary optics for generating a predetermined light distribution on a roadway in front of a vehicle.
  • the present invention relates to an LED module and a motor vehicle headlight with such a projection optics.
  • Motor vehicle headlights with a light source in the form of an LED matrix which comprises a plurality of matrix-like juxtaposed and / or superimposed LED chips are also referred to as matrix headlights.
  • the LED matrix may consist of a single row or column with a plurality of LED chips or of a plurality of rows or columns arranged above or next to one another, each with a plurality of LED chips.
  • Matrix headlights produce a light distribution on the road ahead of the motor vehicle, which has a plurality of juxtaposed partial light distributions in the form of pixels or stripes. As a rule, each LED chip generates its own partial light distribution.
  • a matrix headlight without moving parts can be used to generate an adaptive light distribution.
  • Matrix floodlights are known in various embodiments from the prior art, cf. for example.
  • each primary optic is assigned an individual projection optics (or secondary optics).
  • each primary optic is assigned an individual projection optics (or secondary optics).
  • two light source modules so always two light source modules, at least two primary optics modules and at least two secondary optics modules are combined.
  • At least two light exit surfaces per matrix headlight are visible from the outside.
  • the result is a so-called facet-eye-headlight module.
  • the projected on the road strip partial light distributions have a relatively large angular width of at least 2 ° horizontally or even significantly more. Although the superposition of such broad stripes improves the homogeneity of the light distribution, it reduces the achievable resolution.
  • the known headlamp requires at least two complete, mutually independent light modules per headlamp, each light module has an LED matrix, a primary optic and a secondary optics.
  • each light module has an LED matrix, a primary optic and a secondary optics.
  • a headlamp consists of at least two light sources, two primary optics and two secondary optics.
  • the present invention has the object, a matrix headlight of the type mentioned or parts thereof to design and further develop that the headlight with a single primary optics and a single projection optics has improved homogeneity of the resulting light distribution, wherein the light distribution is visible from the outside to emerge from a single light exit opening or from a single projection optics from the headlight.
  • the projection optics is formed so that it generates at least two separate mutually offset in the horizontal direction mappings of the exit surface of the primary optics on its image page, so that a superimposition of the images produced improves the homogeneity of the light distribution.
  • the projection optics according to the invention it is possible to generate the desired improved and more homogeneous matrix light distribution from a single visible and tangible outlet opening (so-called one-eye-matrix headlight).
  • the proposed projection optics achieve a compensation of color effects and homogeneity or intensity fluctuations up to half a pixel width, without the use of Special glasses or plastics needed and without the sharpness of image, in particular to reduce the pixel edge sharpness. Thanks to the proposed projection optics, color compensation and homogeneity improvement can thus be achieved in a matrix headlight without additional loss of sharpness, in particular with respect to the periodically appearing color, homogeneity and aberrations.
  • a single matrix-like light source which is preceded by a single integral primary optics, whose exit light distribution is imaged on the light exit surface on the roadway via a single integral projection optics such that at least two separate primary optics mappings arise , so that in their interaction pixel edges and boundary steepnesses are maintained and the remaining periodically occurring color and homogeneity or intensity fluctuations compensate each other.
  • a single integral primary optics whose exit light distribution is imaged on the light exit surface on the roadway via a single integral projection optics such that at least two separate primary optics mappings arise , so that in their interaction pixel edges and boundary steepnesses are maintained and the remaining periodically occurring color and homogeneity or intensity fluctuations compensate each other.
  • the projection optics it is conceivable to vary one or more active optically effective surfaces of the projection optics.
  • this may be a light entry surface, a light exit surface and / or any other surface therebetween (eg in the case of an achromatic lens).
  • the active optically effective surface of the projection optics is preferably divided and / or displaced in such a way that the at least two separate images of the light exit surface of the primary optics, which are displaced in the horizontal direction, are generated.
  • each The generated images contribute a part of the common luminous flux or a part of the intensity and the illuminance.
  • the proportion each image contributes depends on the number of separate images generated.
  • the proportion is preferably 50% for two images and accordingly for three images 33% of the common value of the resulting light distribution.
  • the projection optics is designed such that the separate images of the exit surface of the primary optics are each offset by a value b / n to each other, where b is a width, in particular an angular width, of a pixel formed by imaging a single light exit surface of a single primary optic element and n a number of the separate images of the exit surface of the primary optics generated by the projection optics is.
  • the projection optical system is designed, for example, to produce two separate images of the light exit surface of the primary optics, these two images are preferably offset by half a pixel width from one another.
  • the images of the light exit surface of the primary optics are preferably offset from one another by one third of the pixel width when the projection optics are designed to produce three separate images. In this way, a particularly homogeneous light distribution can be generated.
  • An important aspect of the present invention resides in the fact that a single matrix-like light source, which is preceded by a single integral primary optics, whose exit light distribution is imaged on the light exit surface on the roadway via a single integral projection optics such that at least two separate Primary optics mappings arise, so that in their interaction pixel edges and boundary steepness are preserved and the remaining periodically occurring color and homogeneity or intensity fluctuations compensate each other.
  • a single matrix-like light source which is preceded by a single integral primary optics, whose exit light distribution is imaged on the light exit surface on the roadway via a single integral projection optics such that at least two separate Primary optics mappings arise, so that in their interaction pixel edges and boundary steepness are preserved and the remaining periodically occurring color and homogeneity or intensity fluctuations compensate each other.
  • the projection optics have at least two separate optical axes.
  • the separate optical axes of the projection optics preferably run in the same horizontal plane.
  • the horizontal plane preferably comprises a module axis of an LED module provided with the projection lens.
  • the module axis preferably extends from the center of the light exit surface of the primary optics in the direction of travel. The distance between the optical axes is relatively small. It is chosen so that separate images of the light exit surface of the primary optics are generated, which are offset from each other in the horizontal direction by a fraction of a pixel.
  • the different optical axes of the projection optics cause different images of the light exit surface of the primary optics are generated.
  • the number of separate images produced by the projection lens corresponds to the number of separate optical axes.
  • the images of the light exit surface of the primary optics are offset from each other according to the course of the optical axes.
  • the fact that the optical axes extend in the same horizontal plane the separate images are offset only in the horizontal direction to each other. If the optical axes were arranged in different horizontal planes, this would result In addition, a vertical offset of the images to each other.
  • the separate optical axes of the projection optics run parallel and at a distance from one another.
  • the separate optical axes of the projection optics run obliquely to each other.
  • the optical axes of the projection optics preferably intersect in a plane of the light exit surface of the primary optics.
  • the plane of the light exit surface is preferably perpendicular to the horizontal plane in which the optical axes are arranged. It is particularly preferred if the oblique optical intersect at an intersection of the module axis with the light exit surface of the primary optics.
  • At least one active optical surface of the projection optics is provided with alternating optical regions arranged side by side and / or one above another for producing substantially identical images of the exit surface of the primary optics, wherein a first group of the optical Produces areas a first image of the exit surface of the primary optics and generates at least one other group of optical areas at least one further image of the exit surface of the primary optics, wherein the images generated in the resulting light distribution in the horizontal direction offset from each other.
  • at least one active optical surface of the projection optics strip or checkerboard be provided with the alternating areas.
  • Each group of areas is assigned its own optical axis, which is separate from the optical axes of other groups of areas.
  • the alternating optical regions are formed on a light exit surface of the projection optics. It is further preferred that the alternating optical areas are strip-shaped, wherein the strips extend in the vertical direction. If the projection optics produce two separate images of the light exit surface of the primary optics, the strip-shaped regions are preferably assigned alternately to one of two groups. Accordingly, preferably every third strip-shaped region is assigned to one of three groups if the projection optics produce three separate images of the light exit surface of the primary optics.
  • the active optical surface of the projection optics is provided with a plurality of prisms extending over the entire surface, whose longitudinal axes extend parallel to one another, wherein a prism surface of the prisms represents the first image of the exit surface of the prism Primary optics generated and the other prism surface of the prisms generated the second image of the exit surface of the primary optics.
  • the prism surfaces may be flat or curved.
  • a tip of the prisms is flattened over its entire longitudinal extent, so that a roof surface of the prisms results, which produces a further image of the primary optic light exit surface, which differs from the other two figures in FIG horizontal direction is offset.
  • the projection optics can therefore be three separate, in horizontal Generate direction offset images of the light exit surface of the primary optics.
  • the images are preferably offset by b / 3 with respect to each other, where b is the width, in particular an angular width, of a pixel of the resulting light distribution, that is to say a partial image of a partial light exit surface of a primary optics element.
  • the prism surfaces of the prisms are each subdivided into two partial surfaces over their entire longitudinal extent, wherein a contact line of the partial surfaces of a prism surface of a prism runs parallel to the longitudinal axis of the prism, wherein the partial surfaces each have a separate and to the other images staggered image of the light exit surface of the primary optics generate.
  • the projection optics can thus produce four separate images of the light exit surface of the primary optics which are staggered in the horizontal direction.
  • the projection lens can even produce five separate images of the light exit surface of the primary optics offset in the horizontal direction.
  • the images are preferably offset by w '/ 4 or w' / 5 relative to each other, where w 'is the width, in particular an angular width, of a pixel of the resulting light distribution, ie a partial image of a partial light exit surface of a primary optics element.
  • the alternating optical regions formed on the at least one active optical surface of the projection optical system have an amplitude of less than 0.1 mm, preferably less than a few tens of micrometers, most preferably of a few micrometers.
  • an LED module according to the invention can be realized.
  • an inventive headlight can be realized.
  • an inventive motor vehicle headlamp is designated in its entirety by the reference numeral 1.
  • the headlight 1 has a housing 2, which is preferably made of plastic.
  • the headlight housing 2 has a light exit opening 4, which is closed by means of a transparent cover 5.
  • the cover 5 is made of glass or plastic.
  • On the cover 5, at least partially optically effective profiles eg prisms or cylindrical lenses
  • may be arranged to scatter the light passing through so-called diffuser.
  • the cover 5 is formed without such optically active elements (so-called clear disc).
  • a light module 6 is arranged inside the headlight housing 2.
  • the light module 6 can serve to generate any desired headlight function or a part thereof.
  • the light module 6 can be used to produce a low beam distribution, a high beam distribution, a fog light distribution or any adaptive light distribution.
  • a further light module 7 can be arranged in the housing 2. This serves, for example, to generate another headlight function. It would also be conceivable that the light modules 6, 7 together generate certain headlight function.
  • the light module 7 could produce a low beam basic light distribution with a relatively wide spread and a horizontal cut-off.
  • the light module 6 could then generate a low-beam spotlight distribution which is relatively strongly concentrated in comparison with the low-beam basic light distribution of the light module 7 and has an asymmetrical cut-off at the top. A superposition of the basic light distribution and the spotlight distribution results in a conventional low-beam distribution.
  • the headlight housing 2 in addition to the light modules 6, 7 further light modules are arranged.
  • only one light module for example the light module 6 without the light module 7, can be arranged in the spotlight housing 2.
  • one or more luminaire modules such as the luminaire module 8 shown by way of example, to be arranged in the housing 2.
  • the lighting module 8 is used to generate any lighting function, such as a flashing light, a position light, a daytime running light, etc.
  • the light module 6 is preferably designed as an inventive LED module.
  • the LED module 6 is shown in detail in FIG FIG. 2 shown.
  • the LED module 6 has a light source in the form of an LED matrix, which is designated in its entirety by the reference numeral 10.
  • the LED matrix 10 has a plurality of matrix-like side by side and one above the other arranged LED chips 11.
  • the LED module 6 comprises a primary optic, which is designated in its entirety by the reference numeral 12.
  • the primary optics 12 has a plurality of matrix-like side by side and superimposed primary optic elements 13. In the illustrated Embodiment, each LED chip 11 is assigned its own primary optics element 13.
  • the LED chip 11 emits light in a main emission direction 14, which for the most part couples into the primary optic element 13 via a light entry surface 15.
  • the primary optic element 13 itself may be designed as a conventional reflector for mirror reflection or as a so-called intent optical element of a transparent material (eg glass or plastic) for total reflection.
  • the primary optic element 13 is designed as a totally reflecting front optic made of a transparent plastic material.
  • the primary optics 12 can focus the light emitted by the LED matrix 10.
  • the LED module 6 comprises a projection optics 16, which is formed as an optical lens.
  • the projection optics 16 is also referred to as secondary optics. It projects an exit surface 17 of the primary optics 12 for generating a predetermined light distribution on a roadway in front of a vehicle equipped with the headlight 1 and the LED module 6.
  • the projection optics 16 may be formed as a conventional optical lens or as an achromat.
  • the headlight 1 with the LED module 6 is also referred to as a matrix headlight, since it generates a light distribution with a plurality of side by side and / or superimposed pixel or strip-shaped partial light distributions.
  • the individual partial light distributions, which are generated by the light of an LED 11 and the associated primary optics element 13, are also referred to as pixels.
  • Each of the partial light distributions is represented by the image of a partial light exit surface of a single primary optic element 13 the primary optics 12 generated by the projection optics 16.
  • FIG. 3 By way of example, a light distribution of a known from the prior art matrix headlight 1 is shown.
  • the light distribution 20 is imaged on a measuring screen 21, which is arranged at a defined distance from the headlight 1 or the LED module 6 in front of the motor vehicle.
  • a horizontal HH and a perpendicular vertical VV are drawn on the measuring screen.
  • the light distribution 20 illustrated here by way of example has a multiplicity of pixels 22, 23, 24 arranged next to and above one another.
  • the pixels 22, 23, 24 are arranged in the illustrated embodiment in three rows and in thirty columns.
  • the pixels of the upper row are designated by the reference numeral 22, the pixels of the middle row by the reference numeral 23 and the pixels of the lower row by the reference numeral 24.
  • Each pixel 22, 23, 24 of the illustrated light distribution 20 is generated by an LED chip 11 in cooperation with the associated primary optics element 13 after projection by the secondary optics 16.
  • any other adaptive light distributions 20 can also be achieved by targeted switching on / off and / or dimming of the LEDs 11.
  • the resulting light distribution 20 may have an undesirable color fringe.
  • it can come in the light distribution 20 to clearly visible intensity fluctuations.
  • the present invention is intended to improve the homogeneity of the light distribution 20 with regard to disturbing color effects and intensity fluctuations.
  • the present invention proposes a special homogenizing projection optics (or secondary optics) 16 as a component of a matrix headlight 1 for motor vehicles, in which a light exit surface 17 of the primary optics 12 consists of a plurality of periodic structures arranged in pixel or strip form, which are formed by the special projection optics 16 is projected onto the roadway to realize a dynamic low beam, partial high beam, matrix light or high beam function.
  • the projection optical system 16 generates at least two separate ones on the image side, ie on the roadway or on a measuring screen 21 Figures 25, 26 (cf. FIGS. 4 and 5 ) of the object-side light exit surface 17 of the primary optics 12. By superposing the at least two separate images 25, 26 results in a resulting light distribution 27 (see.
  • FIG. 6 wherein the at least two images 25, 26 are offset from one another in the horizontal direction in such a way that a clear improvement in the homogeneity of the light distribution 27 results. In particular, unwanted color effects or intensity fluctuations in the light distribution 27 are deliberately reduced or even completely eliminated.
  • the separate images 25, 26 of the light exit surface 17 of the primary optics 12 are generated by a common projection optics 16.
  • a first image 25 of the light exit surface 17 of the primary optics 12, which can be produced by the projection optics 16 according to the invention, is shown by way of example in FIG FIG. 4 shown.
  • Figure 25 off FIG. 4 is offset in the example shown by about 1/4 pixel to the left with respect to the vertical VV.
  • a second image 26 of the light exit surface 17 of the primary optics 12 is shown in FIG. 5 .
  • the second separate image 26 is shifted in the illustrated embodiment by about 1 ⁇ 4 pixels to the right with respect to the vertical VV.
  • the first and second images 25, 26 are offset by about 1/2 pixel relative to each other.
  • Each image 25, 26 contributes half the common luminous flux to the resulting total light distribution 27, and half the intensity and half illuminance to the total value of the light distribution 27.
  • the intensity of the individual images 25, 26 depends on the length of the prism surfaces or on the proportion of the prism base surface which is assigned to the corresponding prism surface.
  • a preferred embodiment comprises prisms with equal prism base area proportions.
  • FIGS. 7 and 8 show light distributions 20, 27 with marked ISO lines (isolux lines to designate areas of the same illuminance) referenced.
  • FIG. 7 the light distribution 20, which was produced by means of a conventional LED module, is shown.
  • the illustrated light distribution 20 is a low-beam distribution or a partial high-beam light, with the entire area of the oncoming lane having been removed from the light distribution 20 in order to prevent dazzling oncoming road users.
  • the light distribution 20 is imaged on a measuring screen 21. It can be clearly seen that the lines 30 of the same intensity or illuminance have inhomogeneities which are recognizable by the restless line course. In contrast, the lines 31 of the same intensity or illuminance have significantly less inhomogeneities in the light distribution 27 produced by the matrix headlight 1 or the LED module 6 according to the invention, which can be recognized by the significantly quieter course of the line.
  • FIGS. 7 and 8 show by way of example the same low-beam pattern 20, 27 of a matrix headlight 1 with an LED matrix light source 10 with three lines. All the LED chips 11 of the LED matrix 10 that generate pixels of the upper and lower rows on the left side of the light distribution 20, 27, plus one pixel each on the right side of the light distribution 20, 27 near the HV point are turned off, not to blind the oncoming traffic.
  • the ISO lines 30 in FIG. 7 are much more restless.
  • the ISO lines 31 of the light distribution 27 off FIG. 8 on the other hand are smoother and with fewer deviations
  • FIG. 9 an inventive LED module 6 is shown with a projection optics 16 according to the invention in detail.
  • the illustrated embodiment of the projection optics 16 is used to generate two separate images 25, 26 of the light exit surface 17 of the primary optics 12.
  • the projection optics 16 can also be configured so that it produces more than two separate and mutually displaced in the horizontal direction mappings.
  • the projection optics 16 has two parallel optical axes, which are designated by the reference numerals 40 and 41.
  • the reference numeral 42 denotes a module axis of the LED module 6, which extends from the center of the primary optics 12 in the direction of travel 3.
  • the distance between the optical axes 40, 41 is small and only so large that the projection optics 16 can project two separate images 25, 26 with 1/2 pixel spacing on the roadway in front of the motor vehicle.
  • the optical axes 40, 41 are preferably arranged on a common horizontal plane, which preferably also includes the module axis 42.
  • the projection optical system 16 is divided into two halves 16a, 16b along a vertical center plane, which comprises the module axis 42 divided.
  • One half 16a is preferably associated with the optical axis 41 and the other half 16b is preferably associated with the optical axis 40.
  • the projection optics 16 It is not necessary that all active optical surfaces of the projection optics 16 must undergo a division and / or displacement of the generating surfaces. It is sufficient if only one of these surfaces is formed in a corresponding manner. This may be, for example, a light entry surface, a light exit surface or an area of the primary optics 16 arranged therebetween. However, at least one of the active optical surfaces of the projection optical system 16 must be modified in such a way that the at least two images 25, 26 of the light exit surface 17 of the primary optics 12 can be generated, which are offset from one another in the horizontal direction.
  • FIG. 10 a further embodiment of an LED module 6 according to the invention with two optical axes 43, 44 is shown, which run obliquely to each other.
  • the optical axes 43, 44 intersect in a plane of the light exit surface 17 of the primary optics 12.
  • the optical axes 43, 44 are preferably arranged on a common horizontal plane, which preferably also includes the module axis 42.
  • a first half 16a of the projection optics 16 of the optical axis 44 and a second half 16b of the projection optics 16 of the optical axis 43 are assigned.
  • FIG. 11 is a corresponding Embodiment shown, wherein on the light exit surface of the projection optics 16 juxtaposed alternating optical regions 16c, 16d are formed.
  • the regions 16 c, 16 d are arranged in strips on the light exit surface of the projection optical system 16.
  • the areas may also be formed like a checkerboard or in any other way.
  • the optical regions 16c, 16d are not formed on the light exit surface but on the light entry surface or any other surface between the light entry surface and the light exit surface of the projection optics 16.
  • the optical regions 16c, 16d are designed to produce substantially identical images 25, 26 of the exit surface 17 of the primary optic 12. In this case, all regions 16c together generate a first image of the light exit surface 17 and all regions 16d together form a second image 26 of the exit surface 17.
  • the first optical regions 16c is preferably the first optical axis 40 and the second optical regions 16d is preferably the second optical axis 41 assigned. In this way, a projection optical system 16 can be realized, which can produce a plurality of separate images 25, 26 of the light exit surface 17 of the primary optics 12, which are offset in the horizontal direction relative to each other.
  • the first optical regions 16c form a first group, which generate the first image 25 of the exit surface 17, and the second regions 16d form a second group, which generate the second image 26 of the exit surface 17 of the primary optics 12.
  • the first areas 16c are marked with a hatching.
  • this serves first Line for identifying and better distinguishing the two areas 16c, 16d from each other.
  • an optically active structure for example a scattering structure
  • FIG. 12 a further embodiment of an LED module 6 and a projection optical system 16 according to the invention is shown.
  • an active optical surface of the projection optics 16 in the illustrated embodiment, the light exit surface, provided with a plurality of extending over the entire surface, side by side prisms whose longitudinal axes parallel to each other and in the vertical direction.
  • a first prism surface 16e of the prisms generates a first image 25 of the exit surface 17 of the primary optics 12.
  • Another prism surface 16f of the prisms produces a second image 26 of the exit surface 17 of the primary optic 12.
  • a first prism surface 16e forms a second prism surface 16f of each of the prisms Prisms on the light exit surface of the projection optics 16.
  • the first optical axis 41 and the other prism surfaces 16f, the second optical axis 42 associated with the first prism surfaces 16e are generated, which are offset in the horizontal direction to each other.
  • the amplitudes of the prism structure on the light exit surface of the projection optical system 16 FIG. 12 are relatively small, so that they are difficult to see with the naked eye. In particular, an order of magnitude of the amplitudes of a few micrometers to a few tens of micrometers is intended.
  • the structures are perceived by an observer from outside of the headlight 1 through the cover 5 through at most as slightly indicated stripes or alternatively as a relatively inconspicuous checkerboard pattern on the projection optics 16.
  • FIG. 13 various design possibilities of the prism structure on the optically active surface of the projection optics 16 are proposed.
  • a cross section through one of the prisms is shown at the top in each case, and below this, the images of the light exit surface 17 of the primary optics 12 that can be achieved by the illustrated prism structure are shown.
  • the prism structure out FIG. 13a corresponds to the prism structure, which in the embodiment of the projection optics 16 off FIG. 12 was applied.
  • the images 25 and 26 achievable thereby are offset by 1/2 pixel width w 'from one another.
  • FIG. 13b is a tip of the prisms 16e, 16f flattened over its entire longitudinal extent, so that a roof surface 16g of the prisms results, which produces a further image 28 of the light exit surface 17 of the primary optics 12, to the other two images 25, 26, through the prism surfaces 16e, 16f are generated, offset in the horizontal direction.
  • the three images 25, 26, 28 are preferably mutually offset by 1/3 pixel width w 'in the horizontal direction.
  • the prism angle ⁇ must be suitably adapted.
  • the Surface 16g produces an image 28 in the center of the light distribution.
  • the prism surfaces 16e, 16f of the prisms over their entire longitudinal extent in each case in two partial surfaces 16e1, 16e2; Divided 16f1, 16f2.
  • the partial surfaces 16e1,16e2; 16f1, 16f2 of a prism surface 16e; 16f produce two separate and staggered images 25, 28; 26, 29, which also to the other figures 26, 29; 25, 28 are offset.
  • the four images 25, 26, 28, 29 of the light exit surface 17 of the primary optics 12 are each offset by 1/4 pixel width w 'from each other.
  • FIG. 14 Further possible embodiments of the prism structure are shown on the optically active surface of the projection optics 16.
  • the actual prisms of the Figure 14a ), 14b), 14c) correspond substantially to the prisms of the FIGS. 13a ), 13b), 13c).
  • straight portions 16h are provided between the individual prisms 16e, 16f. This makes it possible with the prism structure out Figure 14a ) to produce a total of two plus an equal three separate images of the light exit surface 17 of the primary optics 12. It is the same with the prismatic structure FIG. 14b ) it is possible to generate a total of two plus two equal four separate images.
  • the strips 16g and 16h can produce identical images, because the optical axes are not tilted to each other, and thereby the images are superimposed. In a similar way can through the prismatic structure FIG. 14c ) four plus a five images of the light exit surface 17 of the primary optics 12 are generated.
  • FIG. 16 is an example of a section of a surface structure for an optically active surface of a projection optical system 16 according to the invention shown.
  • the structure of the first order is shown with a solid line 50
  • a structure of the second order with a dashed line 51
  • the first-order structure 50 generates two separate images 25, 26 of the light exit surface 17 of the primary optics 12, which are shifted by 1/2 pixel width from each other.
  • the second-order prism structure 51 has half the frequency (double period) and always tilts two adjacent edges (a whole period) of the structure of the first order 50 with one of its edges (prism surfaces) and thus leads to a displacement of the images from one another. 4 pixel width.
  • the prism structure 52 is the sum (resulting) of the 1st order prism structure 50 and the 2nd order prism structure 51.
  • the amplitude h of the 1st order structure 50 is related to the required deflection angle of +/- 0.3 °.
  • the 2nd order prism structure 51 has the same amplitude h as the 1st order prism structure 50. In the manner described above, higher order adjustments can in principle also be generated.

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  • Physics & Mathematics (AREA)
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EP14180018.5A 2013-09-06 2014-08-06 Optique de projection destinée à être utilisée dans un module à DEL d'un phare de véhicule automobile, et module à DEL et phare de véhicule automobile doté d'une telle optique de projection Active EP2846077B1 (fr)

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DE102013217843.3A DE102013217843A1 (de) 2013-09-06 2013-09-06 Projektionsoptik zum Einsatz in einem LED-Modul eines Kraftfahrzeugscheinwerfers, sowie LED-Modul und Kraftfahrzeugscheinwerfer mit einer solchen Projektionsoptik

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EP2846077B1 (fr) 2020-04-22
EP2846077A3 (fr) 2015-03-25
CN104421714A (zh) 2015-03-18
DE102013217843A1 (de) 2015-03-12
US20150070926A1 (en) 2015-03-12
US9476558B2 (en) 2016-10-25

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