EP3657066B1 - Unité d'éclairage pour un phare de véhicule automobile destinée à générer une répartition lumineuse à coupure - Google Patents

Unité d'éclairage pour un phare de véhicule automobile destinée à générer une répartition lumineuse à coupure Download PDF

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Publication number
EP3657066B1
EP3657066B1 EP18207781.8A EP18207781A EP3657066B1 EP 3657066 B1 EP3657066 B1 EP 3657066B1 EP 18207781 A EP18207781 A EP 18207781A EP 3657066 B1 EP3657066 B1 EP 3657066B1
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EP
European Patent Office
Prior art keywords
reflector
baffle
section
diaphragm
lighting unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18207781.8A
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German (de)
English (en)
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EP3657066A1 (fr
Inventor
Stephan Arlinghaus
Helmut Erdl
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
Bayerische Motoren Werke AG
Original Assignee
ZKW Group GmbH
Bayerische Motoren Werke AG
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Filing date
Publication date
Application filed by ZKW Group GmbH, Bayerische Motoren Werke AG filed Critical ZKW Group GmbH
Priority to EP18207781.8A priority Critical patent/EP3657066B1/fr
Priority to PCT/EP2019/082053 priority patent/WO2020104576A1/fr
Priority to JP2021529066A priority patent/JP7220287B2/ja
Priority to CN201980076985.7A priority patent/CN112997034B/zh
Priority to US17/295,506 priority patent/US11421842B2/en
Priority to KR1020217019083A priority patent/KR102578466B1/ko
Publication of EP3657066A1 publication Critical patent/EP3657066A1/fr
Application granted granted Critical
Publication of EP3657066B1 publication Critical patent/EP3657066B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F21S41/336—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors with discontinuity at the junction between adjacent areas
    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • 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
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21W2102/165—Arrangement or contour of the emitted light for high-beam region or low-beam region the borderlines between emitted regions and dark regions other than cut-off lines being variable
    • 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

  • Numerous embodiments of lighting units for a motor vehicle headlight for generating a light distribution with a cut-off line are already known from the prior art.
  • the creation of a defined cut-off line in the photo of a motor vehicle headlight is either required by law - for example, a low beam with a horizontal cut-off line is mentioned - or such a cut-off line is used by vehicle manufacturers as a defined additional light function of the corresponding Motor vehicle headlights desired.
  • the light functions of glare-free high beam or adaptive driving light which can usually be ordered as special equipment when buying a new car, should be mentioned.
  • light-dark boundaries are required in a vertical, horizontal or combined form.
  • light-dark boundaries in lighting units for motor vehicle headlights are implemented either by direct mapping of sufficiently large gradients of the illuminance of the light source or - if the light source used is used does not have such gradients - artificially generated by introducing appropriate diaphragms into the beam path of the lighting unit.
  • the correspondingly produced intermediate light images then have areas which are cropped or darkened by one or more diaphragms and which are imaged with the aid of lenses or reflectors as a light distribution in front of the road in front of the motor vehicle headlight.
  • a corresponding cut-off line can be created by introducing a diaphragm into the beam path. Since the desired light patterns are often restricted to small angular ranges or high illuminance levels are required, if the emitter has wide radiation cones - as can be the case, for example, when using LED light sources or laser light sources - focusing in the area of the beam diaphragm must take place.
  • Such an optical arrangement therefore in any case requires a light source as an emitter, a first reflector that concentrates the light from the light source or the emitter on a focal point, a diaphragm that shades part of the light, and a second reflector that covers the Focal plane of the focal point generated intermediate light image.
  • the entire intermediate light image in the focal plane is formed by the diaphragm or trimmed by the diaphragm. Since the desired light image generated by the motor vehicle headlight usually not only has a light-dark boundary, but also has to meet defined requirements, for example with regard to its light image width in the front of the road, it is usually not sufficient to depict the intermediate image directly in the case of homogeneously radiating light sources or emitters it has to go through a second reflector be widened accordingly. In order to avoid an undesirable softening of the light-dark boundary, i.e.
  • the second reflector can be subdivided into several facets or designed with facets, each of the facets being the part of the Slightly shifts the intermediate image in the horizontal direction.
  • the sum of the individual facet images then results in the entire light image of the motor vehicle headlight.
  • the disadvantage of such an arrangement is that the diaphragm for generating the light-dark border is effective in each individual one of the facet images, and not only in an outer or in the outermost of the facet images, where the use of the diaphragm for generating the light- Dark border is actually needed. This disadvantageously reduces the luminous flux of the motor vehicle headlight, which also reduces its overall efficiency.
  • the present invention therefore has the object of avoiding the disadvantages known from the prior art for lighting units of the type mentioned, reducing the losses in the luminous flux of the lighting unit caused by the diaphragm and increasing the efficiency of the lighting unit.
  • the emerging beam is split into at least two separate beam.
  • the at least one diaphragm in the beam path, it is possible to assign the diaphragm to a specific, first reflector section of the first reflector, in which the generation of a partially cropped or partially shaded intermediate light image with the formation of a light-dark boundary is required and desired. This is achieved by a corresponding arrangement of the diaphragm at a small distance near the first beam emanating from this first reflector section.
  • said at least one diaphragm is spaced at a comparatively significantly greater distance than the small distance set between said diaphragm and the first bundle of rays of the first reflector section. It is thus possible to crop only the intermediate light image generated in the first reflector section with the diaphragm to form a light-dark boundary, but not the intermediate light image generated in at least the second reflector section, for which due to the comparatively larger distance between the outgoing second beam and the diaphragm whose diaphragm edge is not suitable for forming a light-dark boundary.
  • the intermediate image generated at least in the second reflector section thus remains essentially free from the influence of shadowing of the diaphragm arrangement.
  • the invention also includes embodiments of a lighting unit in which the first reflector is subdivided into three or more reflector sections, for example, as well as embodiments in which one or more diaphragms are assigned to individual reflector sections.
  • the losses in the luminous flux of the lighting unit caused by the diaphragm are advantageously minimized and the overall efficiency of the lighting unit is increased if at least one of the three or more reflector sections is essentially free of the influence of shading of the diaphragm arrangement.
  • the at least two or more separate reflector sections of the first reflector can, for example, be designed in one piece, with a transition area being formed, for example in the form of a curve or a line, between adjoining reflector sections.
  • individual or all of the reflector sections of the first reflector can also consist of one or more individual ones Components exist and the first reflector can thus be made in several pieces from several assembled components.
  • an intermediate light image generated in the diaphragm plane is then categorized as "essentially free of influence due to shading of the diaphragm arrangement" if the luminous flux of the intermediate light image in question is not or only slightly reduced by introducing the diaphragm into the beam path and thus with such a diaphragm arrangement no functional cut-off line is achieved.
  • first, second or third reflector section of the first reflector or a first, second or third reflector segment of the second reflector are only intended to improve understanding and simplify readability. Due to the selected ordinal numbers, the relevant individual reflector sections or reflector segments are, however, neither ranked in the sense of a rating, nor are their location, position or alignment to one another fixed.
  • a first screen can be assigned to the first reflector section and a second screen can be assigned to the third reflector section of the first reflector and the said screens are each a short distance away from the first reflector section or be arranged from the third reflector section emanating beam, the intermediate light images generated in the first and in the third reflector section are each cropped to form corresponding light-dark boundaries.
  • the second and fourth reflector sections are each free from the influence of shading by the diaphragm arrangements.
  • the multiple reflector sections can be positioned here with regard to their installation positions, for example in a row, essentially in the horizontal direction next to one another, in columns, essentially in a vertical direction, one below the other, or in any desired matrix arrangement.
  • the first reflector can particularly advantageously be constructed in several parts and have several reflector sections with at least one focal point, and the at least one light source can each be arranged in the at least one focal point, the at least one diaphragm being arranged so that it exclusively assigned to the first reflector section of the first reflector and arranged at a small distance near the beam emanating from the first reflector section and the intermediate light image generated in the first reflector section is cropped to form a light-dark boundary, and the at least one aperture at a greater distance away from the second and if necessary, the further reflector sections of the first reflector outgoing ray bundles spaced apart is arranged and the intermediate light images generated in the second and optionally the further reflector sections are essentially free of the influence of shading of the diaphragm arrangement.
  • the diaphragm-related losses in the luminous flux of the lighting unit can be further minimized and the efficiency of the lighting unit can advantageously be increased further.
  • the second reflector can particularly expediently be divided into two or more reflector segments in the manner of facets, a first reflector segment of the second reflector being assigned to the intermediate light image generated in the first reflector section of the first reflector.
  • transitions between the reflector sections of the first reflector fall on transitions between the reflector segments of the second reflector or the transitions between the reflector sections and the reflector segments are also assigned to one another.
  • the proportion of undesired scattered light can therefore advantageously be reduced.
  • the second reflector in a lighting unit can be divided into two or more reflector segments in a facet-like manner, the first reflector segment of the second reflector being assigned to the intermediate light image generated in the first reflector section of the first reflector.
  • the remaining reflector segments each provide a complete image of the light source used.
  • the division of the first reflector is matched to the faceting of the second reflector in such a way that the light focused on the first reflector section only hits the first reflector segment.
  • This embodiment also offers the advantage that the proportion of undesired scattered light can be reduced.
  • a lighting unit can advantageously be constructed in such a way that the at least one screen is fastened directly on or at least close to the first reflector section of the first reflector.
  • Attaching the diaphragm to the first reflector in this way can contribute to a higher mechanical stability of the diaphragm, the positioning accuracy of the at least one diaphragm to one or more focal points also being increased and the tolerance chain of the positioning inaccuracy of the at least one diaphragm being reduced.
  • This compact design can advantageously reduce the tolerances of the at least one diaphragm.
  • tolerance chain used here is understood in the sense of tolerances with regard to the fluctuations, the positioning and the stability of the diaphragm.
  • the at least one screen is attached directly to or at least close to the first reflector segment of the second reflector.
  • This compact design according to which the diaphragm is connected to the second reflector or is at least fastened close to the first reflector segment of the second reflector, can advantageously reduce the tolerances of the diaphragm.
  • a diaphragm plane of the at least one diaphragm can correspond to a focal plane of the at least one focal point of the first reflector segment of the second reflector.
  • a sharp light-dark boundary advantageously results with a large gradient of the light-dark transition not only near the focal point or focal point, but also at a certain distance from it.
  • the at least one diaphragm in such a way that a diaphragm plane of the at least one diaphragm and a focal plane of the at least one focal point of the first reflector segment of the second reflector only intersect in a line through this focal point or focal point.
  • a sharp cut-off line can deliberately only be achieved in the vicinity of the focal point or focal point, with a diaphragm edge far from the focal point being shown blurred - i.e. with a smaller gradient of the light-dark transition.
  • Such designs with only partially or partially sharp light-dark lines can also be favorable and desirable for applications in the automotive industry.
  • At least the first reflector section of the first reflector can be an ellipsoid reflector, which ellipsoid reflector has a second focal point, wherein the at least one diaphragm is arranged so that it is at a small distance from the second focal point of the first reflector portion is spaced.
  • point-like light sources can advantageously be mapped as points.
  • design of a reflector the surface of which is an ellipsoid of revolution, also offers advantages in terms of manufacturing technology. From a photometric point of view, the use of such an ellipsoid reflector can possibly avoid undesirable distortions in the imaging of the light source in the focal plane.
  • the two or more reflector sections of the first reflector can expediently each be ellipsoidal reflectors, the ellipsoidal reflectors each having a second focal point and the at least one diaphragm being arranged so that it is at a small distance near the The second focal point of the first reflector section is arranged and the diaphragm is arranged at a greater distance away from the second focal points of all further reflector sections of the first reflector.
  • the small distance from the beam and / or from the second focal point of the first reflector section of the first reflector to a diaphragm edge of the diaphragm can be defined as close to the diaphragm if the distance is less than 1.7 times the value of a Reference length, preferably less than 1.5 times the value of a reference length, particularly preferably less than 1.3 times the value of a reference length, and the intermediate light image generated in the first reflector section is cropped to form a light-dark boundary, wherein the reference length is selected as the smallest distance from the distances between the maximum illuminance of all reflector sections of the first reflector and the diaphragm edge of the diaphragm.
  • the distance of that bundle of rays from the diaphragm, which bundle of rays emanates from the first reflector section of the first reflector, for which the diaphragm is effective, is thus defined as close to the diaphragm or near the diaphragm edge if the distance is less than 1.7- times the value, preferably smaller than 1.5 times the value, particularly preferably smaller than 1.3 times the value, the previously defined reference length, provided that the intermediate light image generated in the first reflector section also forms a light-dark -Border is trimmed.
  • the maximum of the illuminance E MAX can be measured, for example, by a luminance camera, which records an image of the intermediate light image in the diaphragm plane, which is made visible, for example, by introducing a matt plane into the diaphragm plane.
  • a further possibility for measuring the maximum of the illuminance E MAX offers the introduction of a mirror or further optics in the beam path or in the diaphragm plane in order to measure the intermediate light image with a luminance camera or some other sensor system.
  • the distance from the second focal point of the first reflector section of the first reflector to the diaphragm or to the diaphragm edge is expediently used for the same categorization.
  • a calculation scheme is advantageously specified to determine which conditions a diaphragm arrangement must meet in order to be selectively assigned to a first reflector section of the first reflector and to be suitable for the formation of a cut-off line of the corresponding intermediate light image.
  • the distance between a bundle of rays and / or a second focal point of the corresponding reflector section of the first reflector away from the diaphragm or from its diaphragm edge is defined and the diaphragm arrangement is essentially free of shading influences on that generated in this reflector section Intermediate photo.
  • the greater distance from the beam and / or from the second focal point of the second reflector section and possibly the further reflector sections of the first reflector to a diaphragm edge of the diaphragm is defined as being far from the diaphragm if by Introducing the diaphragm into the beam path, the luminous flux of the intermediate light image generated in the second and optionally the further reflector sections is reduced by at most 10%, preferably by at most 7%, particularly preferably by at most 5%.
  • an intermediate light image is essentially free of the influence of shading of the diaphragm arrangement if the shape of the intermediate light image generated does not change or changes only insignificantly as soon as the corresponding diaphragm is completely removed from the beam path.
  • the luminous flux reduction caused by the diaphragm fulfills the values given above of at most 10%, preferably by at most 7%, particularly preferably by at most 5%.
  • Minor interferences according to which, under certain circumstances, for example, small edge areas of the intermediate light image generated can be shaded, but without being perceived as a functional cut-off line, thus by definition do not represent any significant shadowing or impairment of the corresponding intermediate light image.
  • the at least one diaphragm in a lighting unit can have a first diaphragm edge for generating a first light-dark boundary and a second diaphragm edge for generating a second light-dark boundary and / or in the beam path between the at least one first
  • the reflector and the at least second reflector can be arranged to be adjustable.
  • the at least one panel is designed essentially L-shaped, with each of the two legs of this L-shaped panel acting as a panel edge, with each of which has its own light Dark border can be generated, for example a horizontal and a vertical light-dark border.
  • the first reflector is divided into three, it would also be possible in such a case to assign the first diaphragm edge of the diaphragm to a first reflector section of the first reflector and the second diaphragm edge of the diaphragm to a further second reflector section of the first reflector by means of a suitable diaphragm arrangement.
  • the third reflector section can be so far removed from the two diaphragm edges that the intermediate light image generated in this reflector section is in turn free from the influence of shadowing of the diaphragm arrangement. This increases the luminous flux yield in a favorable manner.
  • a lighting unit with at least one screen which is essentially V-shaped or in which three screen edges are arranged in a triangular shape and the screen edges form the sides of the triangular screen recess.
  • two diaphragm edges can be optically active and the third diaphragm edge can be arranged in such a way that it is not optically active.
  • the at least one light source in a lighting unit according to the invention can be an LED light source.
  • the at least one light source can be a laser light source.
  • a motor vehicle headlight with at least one lighting unit according to the invention can also be specified.
  • Fig. 1 shows schematically a lighting unit according to the prior art, which has a first reflector R 1 and a second reflector R 2 , with a diaphragm in a beam path S symbolized by an arrow between the first reflector R 1 and the second reflector R 2 B is provided.
  • the second reflector R 2 is divided here into four reflector segments R 21 , R 22 , R 23 and R 24 arranged horizontally next to one another are each assigned to the aperture B.
  • the first reflector R 1 is designed here, for example, as an ellipsoid reflector and has a first focal point F 1R1 and a second focal point F 2R1 .
  • a light source 2 for example an LED light source, is located in the first focal point F 1R1 .
  • the second focal point F 2R1 of the first reflector R 1 is spaced a short distance D 1 from a diaphragm edge BK 1 of the diaphragm B.
  • the diaphragm B is arranged such that the second focal point F 2R1 of the first reflector R 1 lies in its diaphragm plane BE.
  • the second reflector R 2 used here is, for example, a free-form reflector, each of the reflector segments R 21 , R 22 , R 23 and R 24 each having a focal point F 1R2 .
  • These focal points F 1R2 of the second reflector R 2 are also arranged in the diaphragm plane BE.
  • the beam S 1 emerging from the light source 2 and deflected by the reflector R 1 emerges from the first reflector R 1 at the same small distance D 1 close to the diaphragm edge BK 1 of the diaphragm B.
  • a disadvantage of this embodiment known from the prior art is at least that the diaphragm B cuts off each of the intermediate light images of all four reflector segments R 21 , R 22 , R 23 and R 24, each forming light-dark boundaries.
  • the overall efficiency of this known lighting unit - expressed as the quotient of the luminous flux used to the luminous flux exiting (in each case specified in lumens [lm]) - is disadvantageously reduced.
  • FIG. 2a to 2d show the respective intermediate light images of the individual reflector segments R 21 , R 22 , R 23 and R 24 of the in Fig. 1 sketched second reflector R 2 . Due to the different geometries, each of the reflector segments R 21 , R 22 , R 23 and R 24 generates different intermediate light images, each with different distortions of the intermediate light image, the light-dark boundary created by the diaphragm B being both deformed and rotated in its position. The individual facets or reflector segments R 21 , R 22 , R 23 and R 24 shift the intermediate light image produced by them to different extents in the horizontal direction.
  • the light-dark boundary of the overall light image which is shown in Fig. 2e is illustrated as the sum of the Figures 2a to 2d
  • the intermediate light images shown are - apart from slight scattered light, which is here with the in Fig. 2d
  • the intermediate light image shown of the fourth reflector segment R 24 occurs - essentially through the light-dark boundary of the in Fig. 2a shown intermediate light image of the reflector segment R 21 generated.
  • a light image generated in this way is therefore inefficient, since the light-dark boundary is only actually required in one of the four intermediate light images, namely here in the intermediate light image obtained in the first reflector segment R 21 , whereas the light-dark boundary is required in all intermediate light images of the four Reflector segments R 21 , R 22 , R 23 and R 24 is generated.
  • a luminous flux of a total of 100 lumens [lm] and one Assuming reflectivity of the reflectors used of 0.95 or 95% an emerging luminous flux of a total of only 53 lumens [lm] is obtained.
  • FIG. 3a shows a lighting unit 1 according to the invention with a first reflector R 1 constructed in two parts with a first reflector section R 11 and a second reflector section R 12 , with FIG Fig. 3a the beam path S of the first reflector section R 11 of the first reflector R 1 is illustrated.
  • This first reflector section R 11 is arranged near the diaphragm B and is assigned to it.
  • the diaphragm B is provided in the beam path S between the first reflector R 1 and the second reflector R 2 .
  • the second reflector R 2 is divided here, for example, into four reflector segments R 21 , R 22 , R 23 and R 24 arranged approximately horizontally next to one another, only the first reflector segment R 21 being assigned to the diaphragm B.
  • the two reflector sections R 11 and R 12 of the first reflector R 1 are each designed as ellipsoid reflectors and each have a first focal point F 1R11 or F 1R12 and a second focal point F 2R11 or F 2R12 .
  • a light source 2 for example an LED light source, is located in the first focal point F 1R11 or F 1R12 of the two reflector sections R 11 and R 12 .
  • Figure 3b shows for the in Fig. 3a Illumination unit 1 according to the invention illustrated the beam path S in the second reflector section R 12 of the first reflector R 1 .
  • the second focal point F is 2R11 of the first reflector portion R 11 from a diaphragm edge BK 1 of the diaphragm B spaced a slight distance D 1 wherein the light emerging from the light source 2 and from the first reflector portion R 11 deflected beam S 11 in this small distance D 1 near the diaphragm edge BK of the orifice B of the first reflector R 1 emerges.
  • the diaphragm B cuts the intermediate light image generated in the first reflector section R 11 , forming a light-dark boundary. This cropped intermediate photograph is in Figure 4a illustrated.
  • the second focal point F 2R12 of the second reflector section R 12 of the first reflector R 1 is illustrated at a greater distance D 2 away from a diaphragm edge BK 1 of the diaphragm B.
  • the smaller distance D 1 of the second focal point F 2R11 of the first reflector section R 11 from the diaphragm edge BK 1 is in any case smaller than the greater distance D 2 of the second focal point F 2R12 of the second reflector section R 12 from the diaphragm edge BK 1 .
  • the diaphragm B is arranged in such a way that the second focal point F 2R11 of the first reflector section R 11 and the second focal point F 2R12 of the second reflector section R 12 each lie in the diaphragm plane BE of the diaphragm B.
  • the second reflector R 2 used here is, for example, a free-form reflector, each of the four reflector segments R 21 , R 22 , R 23 and R 24 each having a focal point F 1R21 , F 1R22 , F 1R23 and F 1R24 .
  • These focal points F 1R21 , F 1R22 , F 1R23 and F 1R24 of the four reflector segments R 21 , R 22 , R 23 and R 24 of the second reflector R 2 are also arranged in the diaphragm plane BE.
  • the first reflector segment R 21 of the second reflector R 2 is assigned to the intermediate light image generated in the first reflector section R 11 of the first reflector R 1 , this intermediate light image in Figure 4a is shown.
  • the further reflector segments R 22 , R 23 and R 24 of the second reflector R 2 are assigned to the second reflector section R 12 of the first reflector R 1 .
  • the corresponding intermediate light images of the second, third and fourth reflector segments R 22 , R 23 and R 24 are shown in the figures Figures 4b to 4d shown. Since the diaphragm B away at a greater distance D 2 each emanating from the second reflector portion R 12 beam S is disposed at a distance 12, the intermediate light images of the second, third and fourth reflector segment R 22, R 23 R 24 substantially free of or influence by shading the aperture arrangement.
  • Figure 4e shows the total light image as the sum of the Figures 4a to 4d intermediate light images shown. Since the diaphragm B only acts on the intermediate light image that is obtained from the pairing of the first reflector section R 11 of the first reflector R 1 and the first reflector segment R 21 of the second reflector R 2 associated therewith, the cut-off line of the overall light image becomes generated only in the first reflector segment R 21 of the second reflector R 2 .
  • the other intermediate light images that are obtained from the second, third and fourth reflector segments R 22 , R 23 and R 24 are advantageously not shaded or not cropped because there the distance D 2 of the diaphragm B from the second focal point F 2R12 of the second reflector section R 12 of the first reflector R 1 is further away compared to the small distance D 1 and therefore the intermediate light images of the reflector segments R 22 , R 23 and R 24 are essentially free of shading influences.
  • the in Figure 4e The overall light image shown of the lighting unit 1 according to the invention is given a luminous flux of a total of 100 lumens [lm] used and an assumed reflectivity of the reflectors used of 0.95 or 95%, thus an exiting luminous flux of 62 lumens [lm] in total.
  • the two illustrations Figures 5a and 5b each relate to an alternative embodiment of the invention and each show a lighting unit 1 with a multi-part first reflector R 1 , which is designed here as a two-part free-form reflector.
  • the reflector R 1 has a first reflector section R 11 with a focal point F 1R11 , the diaphragm B being arranged at a distance D 1 close to the beam S 11 emanating from the first reflector section R 11 .
  • the diaphragm B cuts the intermediate light image generated in the first reflector section R 11 , forming a light-dark boundary.
  • the second reflector R 2 is segmented here, for example, into four reflector segments R 21 , R 22 , R 23 and R 24 arranged next to one another.
  • the diaphragm B is here attached directly to the second reflector R 2 on its first reflector segment R 21 and is only assigned to the first reflector section R 11 of the first free-form reflector. Furthermore, only the first reflector segment R 21 of the second reflector R 2 is assigned to the intermediate light image generated in the first reflector section R 11 of the first reflector R 1 . This is in Figure 5a shown.
  • Figure 5b shows the further, second reflector section R 12 of the first free-form reflector of FIG Figure 5a lighting unit according to the invention shown, here in Figure 5b the beam path S of the second reflector section R 12 is illustrated, which is free from the influence of shading by the diaphragm B.
  • the second, third and fourth reflector segments R 22 , R 23 and R 24 of the second reflector R 2 are assigned to the intermediate light image generated in the second reflector section R 12 of the first reflector R 1 . These intermediate light images are advantageously not cropped or shaded because of the lack of a diaphragm.
  • Fig. 6 shows in a detailed view a lighting unit 1 according to the invention.
  • the lighting unit 1 comprises a light source 2 shown in the picture above, which is positioned behind or below the first reflector R 1 .
  • the reflector R 1 is constructed in one piece here and has two reflector sections R 11 and R 12 . Dashed arrows indicate a first bundle of rays S 11 of the exiting light from the first reflector section R 11 and a second bundle of rays S 12 of the exiting light from the second reflector section R 12 .
  • the aperture B between the first reflector R 1 and the second reflector R 2 has a triangular aperture with three aperture edges BK 1 , BK 2 and BK 3 , the aperture edges forming the three sides of the triangular aperture.
  • the diaphragm B is positioned in such a way that a first diaphragm edge BK 1 of the diaphragm B is optically not active here and is arranged somewhat at a distance from the first beam S 11 and from the second beam S 12 .
  • a second diaphragm edge BK 2 and a third diaphragm edge BK 3 of the diaphragm B are optically active here.
  • the first bundle of rays S 11 is focused here near the optically active diaphragm edge BK 3 .
  • the second beam S 12 is focused near the optically active diaphragm edge BK 2 .
  • the intermediate light image generated in the first reflector section R 11 remains essentially free from the influence of shadowing of the diaphragm edge BK 2 .
  • the intermediate light image generated in the second reflector section R 12 remains essentially free from the influence of shadowing of the diaphragm edge BK 3 .
  • the second reflector R 2 is segmented here, for example, into a plurality of reflector segments, with three reflector segments R 21 , R 22 and R 23 arranged next to one another being considered in more detail for the following description. Only the first reflector segment R 21 of the second reflector R 2 is assigned here to the intermediate light image generated in the first reflector section R 11 of the first reflector R 1 .
  • the intermediate light images generated in the second and third reflector segments R 22 , R 23 are advantageously not cropped, which increases the overall efficiency of the illustrated lighting unit 1.
  • the diaphragm B shown here has a further, second diaphragm edge BK 2 , which, analogously to the preceding description, can in turn serve for selective shading of the intermediate light image of a further reflector segment of the second reflector R 2 .
  • Fig. 7 shows in a detailed view a motor vehicle headlight 10 with the in Fig. 6 illustrated lighting unit 1 according to the invention.
  • the lighting unit 1 is already in the installed position within the motor vehicle headlight 1 and is installed with the corresponding housing components of the headlight.
  • a diffusing screen which is used only to protect the motor vehicle headlight 1 and which has no optical function is shown here in FIG Fig. 7 removed for better overview and not shown.
  • a diaphragm arrangement is shown, the distance between the diaphragm edge BK 1 of the diaphragm B and the second focal point F 2R12 of the second reflector section R 12 being arranged at a greater distance D 2 from the diaphragm.
  • the distance D 2 here is greater than one and a half times the value of the reference length L.
  • the intermediate light image produced is, by definition, essentially free from the influence of shadowing of the diaphragm arrangement.
  • the loss of luminous flux in the right half of Fig. 8 The aperture arrangement shown here is below 7%.
  • Fig. 9 shows in a schematic representation a plurality of intermediate light images spaced differently from a diaphragm B or from its diaphragm edge BK 1 .
  • the maximum illuminance of each individual intermediate light image has a certain minimum distance to the diaphragm or to the diaphragm edge, the shortest of these distances being defined as the reference length L.
  • an intermediate light image is precisely close to the diaphragm edge when the smallest distance of the maximum illuminance of the intermediate light image from the diaphragm edge exceeds a specified value.
  • FIG. 9 An example is here in Fig. 9 as the limit value 1.5 times the value of the reference length L shown as a dashed line.
  • the two middle intermediate light images shown are positioned far from the diaphragm edge by definition, since their distances D 1 and D 2 are greater than the limit value given here of 1.5 times the reference length L.
  • the outer left intermediate light image is by definition close to the diaphragm edge because it is in a distance according to the reference length L from the diaphragm edge of the diaphragm B. This is also located in Fig. 9
  • the outer right intermediate light image shown is only a small distance D 3 away from the diaphragm B and is thus close to the diaphragm edge.
  • Fig. 10 represents in a schematic representation an intermediate light image, which is essentially free of influence from shadowing by the diaphragm arrangement of the diaphragm B is.
  • the hatched area labeled 93% is bounded by the isoline within which 93% of the luminous flux of the intermediate light image is located.
  • the non-hatched outer area of the intermediate light image thus represents that edge area of the light image through which 7% of the luminous flux flows.

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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)

Claims (15)

  1. Unité d'éclairage pour un phare de véhicule automobile destinée à générer une répartition lumineuse à coupure, sachant que l'unité d'éclairage (1) comprend :
    - au moins une source lumineuse (2),
    - au moins un premier réflecteur (R1) avec au moins un foyer (F1R1), sachant qu'au moins une source lumineuse (2) est disposée dans au moins un foyer (F1R1), sachant que
    - au moins un premier réflecteur (R1) est agencé pour diffuser et transmettre de la lumière à un deuxième réflecteur (R2),
    - au moins un deuxième réflecteur (R2) avec au moins un foyer (F1R2), sachant qu'au moins un deuxième réflecteur (R2) est monté en aval d'au moins un premier réflecteur (R1) dans la trajectoire du faisceau (S) et est configuré à cet effet pour reproduire une image lumineuse intermédiaire produite par le premier réflecteur (R1),
    - au moins un écran (B), qui est disposé dans la trajectoire du faisceau (S) entre au moins un premier réflecteur (R1) et au moins un deuxième réflecteur (R2), sachant
    - que le premier réflecteur (R1) est constitué au moins en deux parties (R11,R12) et comporte une première section de réflecteur (R11) ainsi qu'au moins une deuxième section de réflecteur (R12) séparée, sachant que chaque section de réflecteur (R11, R12) possède respectivement au moins un foyer (F1R11, F1R12), ainsi qu'
    - au moins un foyer (R1R11, R1R12) de la première et au moins de la deuxième section de réflecteur (R11,R12) sont respectivement disposés en même couverture à l'endroit d'au moins une source lumineuse (2), sachant qu'
    - au moins le premier réflecteur (R11, R12) en deux parties décompose le faisceau de rayons (S1) venant d'au moins une source lumineuse (2) au moins en deux faisceaux de rayons séparés (S11, S12),
    caractérisée en ce qu'
    - au moins un écran (B) est disposé de telle manière que celui-ci est attribué à la première section de réflecteur (R11) du premier réflecteur (R1) et est disposé à une faible distance (D1) près du faisceau de rayons (S11) partant de la première section de réflecteur (R11) et coupe l'image lumineuse intermédiaire produite dans la première section de réflecteur (R11) en formant une coupure et
    - au moins un écran (B) est disposé à distance à une distance plus grande (D2) loin du faisceau de rayons (S12) partant au moins de la deuxième section de réflecteur (R12) et au moins l'image lumineuse intermédiaire produite dans la deuxième section de réflecteur (R12) est pour l'essentiel libre de tout effet par occultation du système d'écrans.
  2. Unité d'éclairage (1) selon la revendication 1, caractérisée en ce que
    - le premier réflecteur (R1) est constitué en plusieurs parties et comporte plusieurs sections de réflecteur (R11, R12), R1N) avec au moins un foyer (F1R11, F1R12, F1R1N), sachant qu'au moins une source lumineuse (2) est respectivement disposée dans au moins un foyer (F1R11,F1R12,F1R1N), sachant qu'
    - au moins un écran (B) est disposé de telle manière que celui-ci est exclusivement attribué à la première section de réflecteur (R11) du premier réflecteur (R1) et est disposé à une faible distance (D1) près du faisceau de rayons (S11) partant de la première section de réflecteur (R11) et coupe l'image lumineuse intermédiaire produite dans la première section de réflecteur (R11) en formant une coupure, ainsi qu'
    - au moins un écran (B) est disposé à distance à une distance (D2,DN) plus grande loin des faisceaux de rayons (S12, S1N) partant de la deuxième (R12) et le cas échéant des autres sections de réflecteur (R1N) du premier réflecteur (R1) et les images lumineuses intermédiaires produites dans la deuxième et le cas échéant dans les autres sections de réflecteur (R12, R1N) sont pour l'essentiel libres de tout effet par occultation du système d'écrans.
  3. Unité d'éclairage (1) selon la revendication 1 ou 2, caractérisée en ce que le deuxième réflecteur (R2) est subdivisé à la manière de facettes en deux ou plusieurs segments de réflecteur (R21, R22, R2N), sachant qu'un premier segment de réflecteur (R21) du deuxième réflecteur (R2) est attribué à l'image lumineuse intermédiaire produite dans la première section de réflecteur (R11) du premier réflecteur (R1) .
  4. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le deuxième réflecteur (R2) est subdivisé à la manière de facettes en deux ou plusieurs segments de réflecteur (R21, R22, R2N), sachant que juste le premier segment de réflecteur (R21) du deuxième réflecteur (R2) est attribué à l'image lumineuse intermédiaire produite dans la première section de réflecteur (R11) du premier réflecteur (R1) .
  5. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'au moins un écran (B) est fixé directement sur ou au moins près de la première section de réflecteur (R12) du premier réflecteur (R1).
  6. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 4, caractérisée en ce qu'au moins un écran (B) est fixé directement sur ou au moins près du premier segment de réflecteur (R21) du deuxième réflecteur (R2) .
  7. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'un plan d'écran (BE) d'au moins un écran (B) correspond à un plan focal (FE) d'au moins un foyer (F1R21) du premier segment de réflecteur (R21) du deuxième réflecteur (R2).
  8. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 7, caractérisée en ce qu'au moins la première section de réflecteur (R11) du premier réflecteur (R1) est un réflecteur ellipsoïde, lequel comporte un deuxième foyer (F2R11), sachant qu'au moins un écran (B) est disposé de telle manière que celui-ci est distant à une faible distance (D1) du deuxième foyer (F2R11) de la première section de réflecteur (R11) .
  9. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 8, caractérisée en ce que les deux ou plusieurs sections de réflecteurs (R11, R12,R1N) du premier réflecteur (R1) sont respectivement des réflecteurs ellipsoïdes, qui comportent respectivement un deuxième foyer (F2R11, F2R12, F2R1N), sachant qu'au moins un écran (B) est disposé de telle manière que celui-ci est disposé à une faible distance (D1) près du deuxième foyer (F2R11) de la première section de réflecteur (R11) et l'écran (B) est disposé distant à une plus grande distance (D2, DN) loin des deuxièmes foyers (F2R12, F2R1N) de toutes les autres sections de réflecteurs (R12,R1N) du premier réflecteur (R1).
  10. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 9, caractérisée en ce que la faible distance (D1) du faisceau de rayons (S11) et/ou du deuxième foyer (F2R11) de la première section de réflecteur (R11) du premier réflecteur (R1) à un bord d'écran (BK1) de l'écran (B) est ensuite définie comme près de l'écran (B), lorsque la distance (D1) est plus petite que 1,7 fois la valeur d'une longueur de référence (L), de préférence plus petite que 1,5 fois la valeur d'une longueur de référence (L), en particulier de préférence plus petite que 1,3 fois la valeur d'une longueur de référence (L), et, l'image lumineuse intermédiaire produite dans la première section de réflecteur (R11) est coupée en formant une coupure, sachant que la longueur de référence (L) est sélectionnée comme distance minimale respectivement à partir des distances du maximum de l'intensité d'éclairage (EMAX) de toutes les sections de réflecteur (R11, R12, R1N) du premier réflecteur (R1) par rapport au bord d'écran (BK1) de l'écran (B).
  11. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 10, caractérisée en ce que la distance plus grande (D2,DN) du faisceau de rayons (S12,S1N) et/ou du deuxième foyer (F2R12, F2R1N) de la deuxième section de réflecteur (R12) et le cas échéant des autres sections de réflecteur (R1N) du premier réflecteur (R1) par rapport à un bord d'écran (BK1) de l'écran (B) est définie ensuite comme loin de l'écran (B), lorsque par introduction de l'écran (B) dans la trajectoire de rayons (S), le flux lumineux de l'image lumineuse intermédiaire produite dans les deuxièmes et le cas échéant les autres sections de réflecteur (R12, R1N) est réduit au maximum de 10 %, de préférence au maximum de 7 %, en particulier de préférence au maximum de 5 %.
  12. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 11, caractérisée en ce qu'au moins un écran (B) comporte un premier bord d'écran (BK1) pour produire une première coupure et un deuxième bord d'écran (BK2) pour produire une deuxième coupure et/ou est disposé de façon réglable dans la trajectoire de rayons (S) entre au moins un premier réflecteur (R1) et au moins le deuxième réflecteur (R2).
  13. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 12, caractérisée en ce qu'au moins une source lumineuse (2) est une source lumineuse à diodes électroluminescentes (DEL).
  14. Unité d'éclairage (1) selon l'une quelconque des revendications 1 à 12, caractérisée en ce qu'au moins une source lumineuse (2) est une source lumineuse au laser.
  15. Phare de véhicule automobile (10) avec au moins une unité d'éclairage (1) selon l'une quelconque des revendications 1 à 14.
EP18207781.8A 2018-11-22 2018-11-22 Unité d'éclairage pour un phare de véhicule automobile destinée à générer une répartition lumineuse à coupure Active EP3657066B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP18207781.8A EP3657066B1 (fr) 2018-11-22 2018-11-22 Unité d'éclairage pour un phare de véhicule automobile destinée à générer une répartition lumineuse à coupure
PCT/EP2019/082053 WO2020104576A1 (fr) 2018-11-22 2019-11-21 Unité d'éclairage destinée à un phare de véhicule automobile pour générer une distribution de lumière à coupure clair-obscur
JP2021529066A JP7220287B2 (ja) 2018-11-22 2019-11-21 明暗境界を有する配光を生成するための自動車投光器用の照射ユニット
CN201980076985.7A CN112997034B (zh) 2018-11-22 2019-11-21 用于产生具有明暗边界的光分布的机动车大灯用的照明单元
US17/295,506 US11421842B2 (en) 2018-11-22 2019-11-21 Lighting unit for a motor vehicle headlight for generating a light distribution having a light-dark boundary
KR1020217019083A KR102578466B1 (ko) 2018-11-22 2019-11-21 명암 경계를 갖는 광 분포를 생성하기 위한 자동차 헤드램프용 조명 유닛

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EP18207781.8A EP3657066B1 (fr) 2018-11-22 2018-11-22 Unité d'éclairage pour un phare de véhicule automobile destinée à générer une répartition lumineuse à coupure

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EP4206524A4 (fr) * 2021-09-18 2024-01-03 Hasco Vision Tech Co Ltd Système de réflexion optique pour dispositif d'éclairage de lampe de véhicule, et dispositif d'éclairage de lampe de véhicule
CN117515468B (zh) * 2024-01-02 2024-04-12 华域视觉科技(上海)有限公司 照明模组、照明系统及车辆

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JP2000348508A (ja) * 1999-06-04 2000-12-15 Stanley Electric Co Ltd 車両用灯具
JP4299980B2 (ja) * 2001-04-13 2009-07-22 スタンレー電気株式会社 ヘッドランプ
JP4145526B2 (ja) * 2001-12-26 2008-09-03 株式会社小糸製作所 自動車用前照灯
JP4536479B2 (ja) * 2003-12-02 2010-09-01 株式会社小糸製作所 車両用前照灯
JP2006024395A (ja) * 2004-07-06 2006-01-26 Ichikoh Ind Ltd 車両用灯具
JP2007080637A (ja) * 2005-09-13 2007-03-29 Koito Mfg Co Ltd 車両用灯具
JP2009277482A (ja) * 2008-05-14 2009-11-26 Ichikoh Ind Ltd 車両用灯具
JP5529708B2 (ja) * 2010-10-29 2014-06-25 株式会社小糸製作所 車両用照明灯具
JP5831788B2 (ja) * 2011-07-01 2015-12-09 スタンレー電気株式会社 車両用灯具ユニット
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JP6154169B2 (ja) * 2013-03-29 2017-06-28 株式会社小糸製作所 車両用前照灯
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US11421842B2 (en) 2022-08-23
CN112997034A (zh) 2021-06-18
US20220010938A1 (en) 2022-01-13
KR20210116445A (ko) 2021-09-27
JP2022513120A (ja) 2022-02-07
EP3657066A1 (fr) 2020-05-27
CN112997034B (zh) 2024-01-30
KR102578466B1 (ko) 2023-09-14
JP7220287B2 (ja) 2023-02-09

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