EP1528312B1 - Beleuchtungsmodul für Kfz-Scheinwerfer - Google Patents

Beleuchtungsmodul für Kfz-Scheinwerfer Download PDF

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Publication number
EP1528312B1
EP1528312B1 EP04292527.1A EP04292527A EP1528312B1 EP 1528312 B1 EP1528312 B1 EP 1528312B1 EP 04292527 A EP04292527 A EP 04292527A EP 1528312 B1 EP1528312 B1 EP 1528312B1
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EP
European Patent Office
Prior art keywords
reflector
cut
lighting module
light
rays
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.)
Not-in-force
Application number
EP04292527.1A
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English (en)
French (fr)
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EP1528312A1 (de
Inventor
Pierre Albou
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Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP1528312A1 publication Critical patent/EP1528312A1/de
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Publication of EP1528312B1 publication Critical patent/EP1528312B1/de
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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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • 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
    • F21S41/145—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device the main emission direction of the LED being opposite to the main emission direction 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]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • F21S41/30—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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • 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 lighting module for a vehicle headlight providing a cut-off type lighting beam particularly suitable for use with light-emitting diodes.
  • cut-off lighting beam is meant a lighting beam which has a directional or cutoff limit above which the emitted light intensity is low.
  • the dipped beam and fog lamp functions are examples of cut-off light beams in accordance with current European legislation.
  • the cut is made by means of a cover, which is formed of a vertical plate of suitable profile, which is interposed axially between the elliptical reflector and the convergent lens, and which is arranged in the vicinity of second focus of the reflector.
  • the cache makes it possible to mask the light rays coming from the light source and reflected by the reflector towards the lower part of the focal plane of the convergent lens, and which would, in the absence of a cover, be emitted by the projector above the cut.
  • a disadvantage of this type of projector is that a significant portion of the light flux emitted by the source is dissipated in the rear face of the cache.
  • Another solution consists in producing a lighting module using a light source and a Fresnel optic or a reflector of the complex surface type. To create a cut, it is necessary to align the edges of the images of the light source on the measurement screen used to validate the regulation light beam.
  • the light source is a diode
  • the image of the virtual source corresponding to the diode is generally round is diffuse and it is much more complicated to make a clean cut by aligning the corresponding images of round shapes.
  • This difficulty can be overcome by using a diaphragm with the diode, but then a significant amount of the light energy produced by the diode is lost.
  • the emission indicators of the most efficient known diodes are complex and the production of a homogeneous beam is very difficult to obtain from the direct images of the diode.
  • the reflector comprises a horizontal flat surface, whose upper surface is reflecting, which defines vertically downwardly the reflection volume, and which has a cutoff edge which is arranged in the vicinity of the second focus of the reflector.
  • the convergent lens is a thick optical system, relatively difficult to manufacture, and of a significant weight.
  • the present invention aims at providing a lighting module for a vehicle headlamp producing a lighting beam of the cut-off type making it possible to achieve a clean cut, in particular by using a diode as a light source, as well as a beam of light. homogeneous lighting while offering less loss of luminous flux by avoiding the use of a cache.
  • the majority of the luminous flux emitted by the source is used in the light beam produced by the module.
  • the lighting module according to the invention makes it possible to achieve a clean cut, in particular with a diode, because it projects the image of the cutting edge at the front.
  • the shape of the cut-off in the lighting beam is thus determined by the profile of the cut-off edge.
  • Another advantage of the module according to the invention is that it exploits a property of the elliptical lighting modules which is to "mix" the images of the light source at the second focus of the first reflector, which improves the homogeneity of the beam. product lighting.
  • such a module has improved optical performance compared to a system using a lens; there are indeed fewer losses due to the non-unit reflection coefficient of the reflective surfaces of the second and third reflectors than by glass reflections in the lens.
  • the first reflector and its light source may be concealed behind one of said second or third reflectors so that the user looking at the output beam does not see the first reflector.
  • Such a solution allows for example to overcome the use of a mask to hide the first reflector and its light source.
  • the optical axes of said second and third reflectors coincide.
  • said first reflector is arranged behind said second reflector so that said first reflector is concealed by said second reflector
  • said second reflector and said third reflector have a focus arranged in the vicinity of said second focus of said first reflector.
  • said second reflector and / or said third reflector comprise a reflection surface of the light rays whose section in a plane is a parabola.
  • said second reflector and / or said third reflector are a type of reflector with a complex surface for reflecting light rays.
  • said light source is a light-emitting diode.
  • said cutting edge is a beveled edge defining an oblique surface, said oblique surface being determined so that said cutting edge does not intercept the rays reflected by said first reflector and passing beyond said second focus.
  • said second focus of said first reflector is in the center of the intersection line portion between said oblique surface and said reflective upper face of said folder.
  • said first and third reflectors are made in one piece and / or said second and fourth reflectors are made in one piece.
  • said second, third and fourth reflectors are made in one piece.
  • the lighting module comprises a fifth reflector receiving directly light rays from said first light source, the reflecting surface of said fifth reflector being such that it produces a third portion of the cut-off beam.
  • said first, third and fifth reflectors are made in one piece.
  • said first and fifth reflectors are made in one piece.
  • the reflecting surface of said unbroken reflector may be a substantially paraboloidal surface to which a reduction factor is applied in a direction perpendicular to the optical axis of said first reflector and to the optical axis of said sixth reflector.
  • said unbroken reflector may be a reflector of complex surface reflection type of light rays.
  • said cutoff edge is a beveled edge defining an oblique surface, said oblique surface being determined so that said cutting edge does not intercept the rays reflected by said first reflector and passing beyond said second focus, said oblique surface being reflective and receiving a portion of the light rays from said fifth reflector and said module comprises a sixth reflector receiving light rays from said oblique surface, said sixth reflector having a substantially paraboloidal surface of reflection of light rays with a fireplace arranged in the vicinity of said second focus of said first reflector.
  • said module comprises a seventh reflector directly receiving the light rays coming from said second light source and having a substantially paraboloidal surface for reflecting light rays.
  • said folder comprises a corrective surface of the field curvature located along said cutting edge and in the continuity of said upper face of said folder so that no ray coming from said first reflector and returned to said third reflector does not exceed said cut.
  • Said corrective surface may be a surface which absorbs light or a reflective surface inclined at a given angle with respect to the plane of said reflective upper face of said folder so that the rays coming from said first reflector and which would have been returned to above the cut in the absence of said corrective surface are entirely reflected in a direction opposite to the direction of said first cut-off lighting beam.
  • the first reflector consists of an ellipso-parabolic surface.
  • the second reflector and / or the third reflector is a parabolic cylinder.
  • the first collector reflector consists of an ellipso-parabolic surface, and / or that the third output reflector is a parabolic cylinder.
  • the figure 1 schematically represents a side view of a vehicle headlamp lighting module 1 according to a first embodiment of the invention.
  • the substantially elliptical reflecting surface 7 is made in the form of an angular sector substantially of revolution and which extends in the half-space above an axial plane perpendicular to the plane of the sheet and containing the optical axis A2. As a first approximation, the surface 7 is a half-ellipsoid.
  • the surface 7 may not be perfectly elliptical and have several specific profiles intended to optimize the light distribution in the light beam produced by the module 1. This implies that the first reflector 2 is not perfectly revolution .
  • the light source 6 is arranged substantially at the first focus F1 of the first reflector 2.
  • the light source 6 is a light-emitting diode which emits the majority of its light energy towards the reflecting inner surface of the substantially elliptical surface 7.
  • This diode 6 is for example a diode made of gallium nitride GaN with a phosphor for emitting white light.
  • the optical axis A1 is substantially parallel to the longitudinal axis of a vehicle not shown and equipped with the lighting module 1 and forms an angle equal to 90 ° with the optical axis A2.
  • the reflective surface 8 is of substantially paraboloidal shape, the axis of the parabola being the optical axis A1.
  • Y be the same direction and in the same direction as the optical axis A2, a direction Z identical and opposite to the optical axis A1 and a direction X so that the XYZ center mark F2 forms a direct reference.
  • the third reflector 4 is then substantially symmetrical to the second reflector 3 with respect to the plane (F2, X, Z). Note, however, that the symmetrical nature of the second and third reflectors 3 and 4 is optional.
  • the fourth reflector 5 also called a bender, is located between the second reflector 3 and the third reflector 4 and comprises at least one reflective upper face and a front end edge 11, said cutting edge.
  • the cutting edge 11 is arranged in the vicinity of the second focus F2 of the first reflector 2.
  • module 1 The operating principle of module 1 is as follows:
  • the light source 6 is arranged at the first focus F1 of the first reflector 2, the majority of the rays emitted by the source 6, after being reflected on the inner face 7, is returned to the second focus F2 or in the vicinity of the second focus F2. -this.
  • R1 is then reflected on the surface 9 of the third reflector 4 in a direction substantially parallel to the optical axis A1 of the third reflector 4.
  • the cutting edge 11 has a bevel 12 defining an oblique surface. This oblique surface 12 is determined so that the cutting edge 11 is not likely to intercept rays reflected by the first reflector 2 and passing beyond the second focus F2.
  • the reflective surface 10 allows to "fold" the images of the light source 6 which are reflected by the elliptical surface 7 of the first reflector 2 to the second focus F2.
  • the "fold” formed by this "folding" of images contributes to forming a clean cut in the illumination beam reflected by the second and third reflectors 3 and 4.
  • the first reflector 2 is located behind the second reflector 3 so that, when looking at the front module (facing the optical axis A1), we do not see the first reflector 2 and the light source 6; these are hidden by the second reflector and it is useless to provide a cache.
  • the second and third reflectors are perfectly symmetrical, so with the same optical axis A1; they may not be symmetrical and have different optical axes, the only condition being that their optical axes intersect at the second focus F2 of the first reflector and belong to the same plane (F2, X, Z).
  • rear face 13 of the folder 5 may be reflective for construction reasons but this reflecting part will not be used.
  • the figure 2 schematically represents a side view of a vehicle projector lighting module 100 according to a second embodiment of the invention.
  • This module 100 is identical to module 1 of the figure 1 with the difference that it further comprises a fifth reflector 14.
  • This fifth reflector has a reflecting surface 15 which receives light rays directly from the light source 6 and produces a beam of light rays below the horizontal cut. If the light source 6 was punctual and without surrounding optical device, the reflective surface 15 would be a paraboloidal surface with a focus located at the second focus F2 of the first reflector.
  • the light source 6 such as a light-emitting diode is not a point source and comprises a not shown chip of square or rectangular surface surrounded by a spherical plastic half-lens not shown and centered on the center of the chip. Therefore, the non-punctualities of the source and the lens must be taken into consideration for the construction of the reflecting surface 15.
  • a complex surface can be used to make the reflective surface.
  • one solution is to construct the reflective surface from a source considered as point and from the point 17 of the square of the chip closest to the fifth reflector 14.
  • the reflecting surface 15 is then constructed so that the radius R5 from point 17 is parallel to the optical axis A1.
  • the construction can be done by considering the spherical wave surface from point 17 which is then transformed into a non-spherical wave surface via its passage through the plastic half-lens. This non-spherical wave surface can be determined by the laws of Descartes.
  • the reflecting surface 15 is constructed so as to obtain a plane wave surface corresponding to a plane parallel to the optical axis A1 after reflection on the reflecting surface 15 of the non-spherical wave surface previously determined. Its equation is obtained by writing the constancy of the optical path along a ray coming from point 17 to a plane perpendicular to the optical axis (this plane can be chosen arbitrarily but must be identical for all the radii considered).
  • the other radii such as the radius R6 coming from the point 18 farther away from the surface 15 will give rise to a radius at below the cut after reflection on the surface 15.
  • This fifth reflector 14 makes it possible to significantly increase the intensity of the cut-off beam by recovering the light that would, in the absence of this fifth reflector 14, be lost towards the rear of the module 100.
  • first, third and fifth reflectors respectively 2, 4 and 14 can be made in one piece with a simple mold without drawer in a standard plastic material of the type PPS (Polysulfide of phenylene). It is the same for the second reflector 3 and the folder 5. In both cases, the reflective coating has to be deposited only on one side since there are reflecting optical surfaces on one side only .
  • PPS Polysulfide of phenylene
  • the fifth reflector can occupy a reduced space under the first reflector 2 and thus leave a free area 16 between said first and fifth reflectors in which an optical device can be inserted for the performance of an additional function such that the production of an unbroken beam such as daytime running lights or daytime running light (DRL).
  • an optical device such as daytime running lights or daytime running light (DRL).
  • the figure 3 schematically represents a side view of a vehicle projector lighting module 101 according to a third embodiment of the invention.
  • This unbroken reflector 18 has a substantially paraboloidal inner reflecting surface 19 with an optical axis coinciding with the optical axis A1 of the second and third reflectors 3 and 4 and a focus F3.
  • This focus F3 is positioned positively along the axis F2-Z and the light source 20 is arranged in the vicinity of said focus F3.
  • the reflective surface 19 of the unbroken reflector 18 was a true parabola, it would produce a substantially circular unbroken output beam.
  • the regulatory bodies require that the uninterrupted functions of the road or DRL type have a beam that is about twice as wide as it is high, ie the beam must spread twice as much along X than according to Y.
  • Another solution consists in producing a complex surface for the reflecting surface 19 by adding streaks on the surface as described in the documents FR2760068 and FR2760067 .
  • the figure 4 schematically represents a side view of a vehicle projector lighting module 102 according to a fourth embodiment of the invention.
  • the fifth reflector 21 is substantially symmetrical to the first reflector 2 with respect to the plane (F2, X, Z). Therefore, the first focus F4 of this fifth reflector 21 is symmetrical to the focus F1 of the first reflector 2 relative to the second focus F2 of the first reflector 2 and the second focus of the fifth reflector is coincident with the second reflector F2 of the first reflector 2 .
  • the second light source is substantially arranged in the vicinity of the first focus F4 of the fifth reflector
  • the reflecting surface 22 of the fifth reflector 21 is therefore substantially elliptical with an optical axis A3 directed in the direction opposite to the optical axis A2.
  • the bevel 12 of the folder is made reflective so that it can reflect a portion of the rays reflected on the reflecting surface 22 of the fifth reflector 21.
  • the sixth reflector 23 receives the light rays coming from the reflective bevel 12, said sixth reflector 23 having a surface substantially paraboloidal reflection of light rays with a focus disposed in the vicinity of the second focus F2 of the first reflector 2.
  • the seventh reflector 25 has a substantially paraboloidal reflecting surface 26 which produces a beam of light rays above and below the horizontal cut.
  • the reflecting surface 26 has a focus located at the second focus F2 of the first reflector and is arranged to directly receive light from the second source 27 and which is not reflected on the surface 22 of the fifth reflector 21.
  • module 102 The operating principle of module 102 is as follows:
  • the second light source 27 is arranged at the first focus F4 of the fifth reflector 21, the majority of the rays emitted by the source 27, after being reflected on the internal face 22, is returned to the second focus F2 or in the vicinity of this one. This is the case of the radius R7 which passes along the cutting edge 11. R7 is then reflected on the surface 8 of the second reflector 3 in a direction substantially parallel to the optical axis A1 of the second reflector 3.
  • the R10-type rays which are not intercepted by the surface 22 of the fifth reflector are emitted towards the surface 26 of the seventh reflector 25 and then transmitted in a beam above and below the cut.
  • the radius R10 shown as reflecting at the center of the surface 26 is exactly on the cut. However, it is conceivable to construct the surface 26 so that it produces a cut-off beam. This construction would be for example identical to the construction of the reflector 14 of the figure 2 by inverting the beams.
  • another arrangement consists in turning the sixth and seventh reflectors 23 and 25 by a positive angle (1 ° in our embodiment) around, respectively, the axis X of the reference and a parallel axis passing by the second light source 27, so as to provide an overlap between the complementary beam and the main beam (the maximum intensity of the sum is then higher and there is more risk of creating a line of contrast between the two beams).
  • the figure 5 represents a curve 200 of an isophot of the illumination module 102 as represented in FIG. figure 1 with a straight cut edge along the X axis.
  • Curve 200 shows that a portion having two vanes 201 and 202 of the illumination beam is above the directional limit or cutoff separating the illuminated surface into two zones I (unbroken) and II (above the cutoff ).
  • fins 201 and 202 in zone II are due to the absence of field curvature correction in particular after reflection on the third reflector 4.
  • all the rays arriving on the reflecting surface 9 and passing along the cutting edge 11 should start again horizontally.
  • the image projected by the paraboloid 9 is never so clear for points located on either side of the focus F2 according to the X direction and slightly offset on the Z axis. The image of these points is found above the cut and explains the presence of the fins 201 and 202.
  • One solution is to prevent the light from passing through the points likely to provide a beam above the horizontal.
  • Such a surface determined by standard software simulation means is then contiguous to the cutting edge 11 and has substantially the shape of the hatched portion under the fins 201 and 202 in the plane (F2, X, Z).
  • the figure 6 represents a reflective corrective surface 400 of field curvature used in a module as shown in FIG. figure 1 .
  • the figure 7 represents an isophote curve 300 of an illumination module as represented in FIG. figure 4 with a cut edge corrected with the surface 400 in the plane P as shown in FIG. figure 6 .
  • Curve 300 shows that the entire illumination beam is below the directional or cutoff limit, i.e. in zone I.
  • the invention therefore consists in using a rectilinear cutoff edge 11 and in forming the image at infinity with the aid of the second and third reflectors 3 and 4, these being constituted by parabolic cylinders, it is to say surfaces such as 8 or 9 on the figure 1 , generated by a line segment perpendicular to the plane of this figure and based on the parabola 8 or 9.
  • the first reflector 2 must therefore be a surface transforming the spherical wave emitted by the light source 6 into a cylindrical wave, whose generator is parallel to the cutoff edge 11.
  • the beam emitted by such a lighting module has the isophote curve 400 represented on the figure 8 .
  • Curve 400 shows that the totality of the illumination beam emitted by the lighting module which has just been described is below the directional limit or cutoff, i.e. in zone I.
  • Such a design makes it possible to design a second variant of the lighting module according to the present invention, more particularly represented on the figure 9 .
  • the first and third reflectors are such as those just described, the second reflector is removed, and the folding reflector is arranged so that its reflective face includes the axis optical A2 of the first reflector collector 2.
  • the light source 6 is arranged at the first focus F1 of the first collector reflector 2, most of the rays emitted by the source 6, after being reflected on the internal face 7, are sent back to the second focus F2 or in the vicinity of this one.
  • the cutting edge 11 has a bevel 12 defining an oblique surface. This oblique surface 12 is determined so that the cutting edge 11 is not likely to intercept rays reflected by the first reflector 2 and passing beyond the second focus F2.
  • R2 will then reflect again on the paraboloidal surface 9 of the output reflector 4 and this reflection will be downward in the plane of the figure 9 .
  • the radius R2 is thus emitted under the cut-off in the lighting beam.
  • the reflective surface 10 allows to "fold" the images of the light source 6 which are reflected by the elliptical surface 7 of the first reflector 2 to the second focus F2.
  • the "fold” formed by this "folding" of images contributes to forming a clean cut in the light beam reflected by the output reflector 4.
  • the first collector reflector 2 can extend up to the optical axis A1 of the output reflector 4, as shown on FIG. figure 9 .

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

Claims (29)

  1. Beleuchtungseinheit (1) für Fahrzeugscheinwerfer, die ein erstes Lichtbündel des Typs mit Hell-Dunkel-Grenze erzeugt, mit
    - einem ersten Reflektor (2), der eine Fläche (7) zur Reflexion der Lichtstrahlen aufweist, deren Schnitt in einer Ebene eine Ellipse ergibt,
    - wenigstens einer ersten Lichtquelle (6), die in der Nähe des ersten Brennpunkts (F1) des ersten Reflektors (2) angeordnet ist,
    dadurch gekennzeichnet, dass die Einheit (1):
    - einen zweiten Reflektor (3) umfasst, der einen ersten Teil des Lichtbündels mit Hell-Dunkel-Grenze erzeugt und eine optische Achse (A1) aufweist, die durch den zweiten Brennpunkt (F2) des ersten Reflektors (2) und senkrecht zur optischen Achse (A1) des ersten Reflektors (2) verläuft,
    - einen dritten Reflektor (4) umfasst, der einen zweiten Teil des Lichtbündels mit Hell-Dunkel-Grenze erzeugt und eine optische Achse (A1) aufweist, die durch den zweiten Brennpunkt (F2) des ersten Reflektors (2) und senkrecht zur optischen Achse (A1) des ersten Reflektors (2) verläuft,
    - einen als Ablenkungsreflektor bezeichneten vierten Reflektor (5) umfasst, der zwischen dem zweiten Reflektor (3) und dem dritten Reflektor (4) angeordnet ist und
    ∘ einen als Begrenzungsrand bezeichneten Rand (11) aufweist, der in der Nähe des zweiten Brennpunkts (F2) des ersten Reflektors (2) solchermaßen angeordnet ist, dass die Hell-Dunkel-Grenze in dem Lichtbündel gebildet wird,
    ∘ eine reflektierende Oberfläche (10) aufweist, die die optischen Achsen (A1) des zweiten bzw. dritten Reflektors (3, 4) umfasst.
  2. Beleuchtungseinheit (1) nach Anspruch 1,
    dadurch gekennzeichnet, dass die optischen Achsen (A1) des zweiten und des dritten Reflektors (3, 4) zusammenfallen.
  3. Beleuchtungseinheit (1) nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet, dass der erste Reflektor (2) hinter dem zweiten Reflektor (3) solchermaßen angeordnet ist, dass der erste Reflektor (2) von dem zweiten Reflektor (3) verdeckt ist.
  4. Beleuchtungseinheit (1) nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass der zweite Reflektor (3) und der dritte Reflektor (4) einen Brennpunkt (F2) aufweisen, der in der Nähe des zweiten Brennpunkts (F2) des ersten Reflektors (2) liegt.
  5. Beleuchtungseinheit (1) nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass der zweite Reflektor (3) und/oder der dritte Reflektor (4) eine Fläche (8, 9) zur Reflexion der Lichtstrahlen aufweisen, deren Schnitt in einer Ebene eine Parabel ergibt.
  6. Beleuchtungseinheit (1) nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet, dass der zweite Reflektor (3) und/oder der dritte Reflektor (4) ein Reflektor vom Freiflächentyp zur Reflexion der Lichtstrahlen ist.
  7. Beleuchtungseinheit (1) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass die Lichtquelle (6) eine Leuchtdiode ist.
  8. Beleuchtungseinheit (1) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass der Begrenzungsrand (11) ein abgeschrägter Rand ist, der eine schräge Fläche (12) bildet, wobei die schräge Fläche (12) solchermaßen festgelegt ist, dass der Begrenzungsrand (11) die vom ersten Reflektor (2) reflektierten und jenseits des zweiten Brennpunkts (F2) verlaufenden Lichtstrahlen nicht abfängt.
  9. Beleuchtungseinheit (1) nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass sich der zweite Brennpunkt (F2) des ersten Reflektors (2) in der Mitte des Abschnitts der Schnittlinie zwischen der schrägen Fläche (12) und der reflektierenden Oberfläche (10) des Ablenkungsreflektors (5) befindet.
  10. Beleuchtungseinheit (1) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass der erste und der dritte Reflektor (2, 4) einstückig ausgebildet sind und/oder der zweite und der vierte Reflektor (3, 5) einstückig ausgeführt sind.
  11. Beleuchtungseinheit (1) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass der zweite, der dritte und der vierte Reflektor (3, 4, 5) einstückig ausgeführt sind.
  12. Beleuchtungseinheit (100) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass sie einen fünften Reflektor (14) umfasst, der die von der ersten Lichtquelle (6) abgegebenen Lichtstrahlen direkt empfängt, wobei die Reflexionsfläche (15) des fünften Reflektors (14) derart ausgeführt ist, dass sie einen dritten Teil des Lichtbündels mit Hell-Dunkel-Grenze erzeugt.
  13. Beleuchtungseinheit (100) nach Anspruch 12,
    dadurch gekennzeichnet, dass der erste, der dritte und der fünfte Reflektor (2, 4, 14) einstückig ausgeführt sind.
  14. Beleuchtungseinheit (100) nach Anspruch 12,
    dadurch gekennzeichnet, dass der erste und der fünfte Reflektor (2, 14) einstückig ausgeführt sind.
  15. Beleuchtungseinheit (101) nach einem der Ansprüche 1 bis 14, die ein zweites Lichtbündel ohne Hell-Dunkel-Grenze erzeugt,
    dadurch gekennzeichnet, dass sie
    - einen begrenzungslosen Reflektor (18) umfasst, der das zweite Lichtbündel ohne Hell-Dunkel-Grenze erzeugt und eine optische Achse (A1) aufweist, die durch den zweiten Brennpunkt (F2) des ersten Reflektors (2) und senkrecht zur optischen Achse (A1) des ersten Reflektors (2) verläuft,
    - eine zweite Lichtquelle (20) umfasst, die in der Nähe des Brennpunkts (F3) des begrenzungslosen Reflektors (18) angeordnet ist.
  16. Beleuchtungseinheit (101) nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass die Reflexionsfläche (19) des begrenzungslosen Reflektors (18) eine im Wesentlichen paraboloidförmige Fläche ist, auf die ein Reduktionsfaktor in einer zur optischen Achse (A2) des ersten Reflektors (2) und zur optischen Achse (A1) des begrenzungslosen Reflektors (18) senkrechten Richtung angewandt wird.
  17. Beleuchtungseinheit (101) nach Anspruch 15,
    dadurch gekennzeichnet, dass der begrenzungslose Reflektor (18) ein Reflektor vom Freiflächentyp zur Reflexion der Lichtstrahlen ist.
  18. Beleuchtungseinheit (102) nach einem der Ansprüche 1 bis 11,
    dadurch gekennzeichnet, dass sie
    - einen fünften Reflektor (21) umfasst, der bezogen auf die Ebene der reflektierenden Oberfläche (10) des Ablenkungsreflektors (5) zu dem ersten Reflektor (2) symmetrisch ist,
    - eine zweite Lichtquelle (27) umfasst, die in der Nähe des ersten Brennpunkts (F4) des fünften Reflektors (21) angeordnet ist.
  19. Beleuchtungseinheit (102) nach Anspruch 18,
    dadurch gekennzeichnet, dass
    - der Begrenzungsrand (11) ein abgeschrägter Rand ist, der eine schräge Fläche (12) bildet, wobei die schräge Fläche (12) solchermaßen festgelegt ist, dass der Begrenzungsrand die vom ersten Reflektor (2) reflektierten und jenseits des zweiten Brennpunkts (F2) verlaufenden Lichtstrahlen nicht abfängt, wobei die schräge Fläche (12) reflektierend ist und einen Teil der vom fünften Reflektor (21) stammenden Lichtstrahlen empfängt,
    - die Einheit (102) einen sechsten Reflektor (23) umfasst, der die von der schrägen Fläche (12) stammenden Lichtstrahlen empfängt, wobei der sechste Reflektor (23) eine im Wesentlichen paraboloidförmige Fläche (24) zur Reflexion der Lichtstrahlen aufweist, mit einem in der Nähe des zweiten Brennpunkts (F2) des ersten Reflektors (2) liegenden Brennpunkt.
  20. Beleuchtungseinheit (102) nach einem der Ansprüche 18 oder 19,
    dadurch gekennzeichnet, dass sie einen siebten Reflektor (25) umfasst, der die von der zweiten Lichtquelle (27) ausgehenden Lichtstrahlen direkt empfängt und eine im Wesentlichen paraboloidförmige Fläche (26) zur Reflexion der Lichtstrahlen aufweist.
  21. Beleuchtungseinheit (1) nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, dass der Ablenkungsreflektor eine Fläche (400) zur Korrektur der Feldkrümmung aufweist, die entlang des Begrenzungsrands (11) und in Fortsetzung der Oberfläche (10) des Ablenkungsreflektors (5) solchermaßen angeordnet ist, dass kein vom ersten Reflektor (2) stammender und zum dritten Reflektor (4) zurückgestrahlter Lichtstrahl über den Begrenzungsrand hinausgelangt.
  22. Beleuchtungseinheit (1) nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass die Korrekturfläche das Licht absorbiert.
  23. Beleuchtungseinheit (1) nach Anspruch 21,
    dadurch gekennzeichnet, dass die Korrekturfläche (400) reflektierend ist und bezüglich der Ebene der reflektierenden Oberfläche (10) des Ablenkungsreflektors in einem bestimmten Winkel solchermaßen geneigt ist, dass die Lichtstrahlen, die von dem ersten Reflektor (3) stammen und bei nicht vorhandener Korrekturfläche über dem Begrenzungsrand zurückgestrahlt würden, in einer zur Richtung des ersten Lichtbündels entgegengesetzten Richtung vollständig reflektiert werden.
  24. Beleuchtungseinheit (1) nach einem der Ansprüche 1 bis 20,
    dadurch gekennzeichnet, dass der erste Reflektor (2) von einer elliptisch-parabolischen Fläche gebildet ist.
  25. Beleuchtungseinheit (1) nach dem vorhergehenden Anspruch,
    dadurch gekennzeichnet, dass der zweite Reflektor (3) ein parabolischer Zylinder ist.
  26. Beleuchtungseinheit (1) nach Anspruch 24 oder Anspruch 25,
    dadurch gekennzeichnet, dass der dritte Reflektor (4) ein parabolischer Zylinder ist.
  27. Beleuchtungseinheit für Fahrzeugscheinwerfer, die ein Lichtbündel des Typs mit Hell-Dunkel-Grenze erzeugt, mit
    - einem ersten Sammelreflektor (2), der eine Fläche (7) zur Reflexion der Lichtstrahlen aufweist, deren Schnitt in einer Ebene eine Ellipse ergibt,
    - wenigstens einer ersten Lichtquelle (6), die in der Nähe des ersten Brennpunkts (F1) des ersten Reflektors (2) angeordnet ist, wobei diese Lichtquelle eine LED umfasst,
    dadurch gekennzeichnet, dass die Einheit
    - einen Auskoppelreflektor (4) umfasst, der ein Lichtbündel mit Hell-Dunkel-Grenze erzeugt und eine optische Achse (A1) aufweist, die durch den zweiten Brennpunkt (F2) des ersten Reflektors (2) und senkrecht zur optischen Achse (A2) des ersten Reflektors (2) verläuft,
    - einen als Ablenkungsreflektor bezeichneten Reflektor (5) umfasst, der zwischen dem ersten Sammelreflektor (2) und dem Auskoppelreflektor (4) angeordnet ist und
    ∘ einen als Begrenzungsrand bezeichneten Rand (11) aufweist, der in der Nähe des zweiten Brennpunkts (F2) des Reflektors (2) solchermaßen angeordnet ist, dass die Hell-Dunkel-Grenze in dem Lichtbündel gebildet wird,
    ∘ eine reflektierende Oberfläche (10) aufweist, die die optische Achse (A2) des ersten Sammelreflektors (2) umfasst.
  28. Beleuchtungseinheit nach Anspruch 27,
    dadurch gekennzeichnet, dass der erste Reflektor (2) von einer elliptischparabolischen Fläche gebildet ist.
  29. Beleuchtungseinheit nach Anspruch 27 oder Anspruch 28,
    dadurch gekennzeichnet, dass der dritte Auskoppelreflektor (4) ein parabolischer Zylinder ist.
EP04292527.1A 2003-10-31 2004-10-25 Beleuchtungsmodul für Kfz-Scheinwerfer Not-in-force EP1528312B1 (de)

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FR0312833A FR2861831B1 (fr) 2003-10-31 2003-10-31 Module d'eclairage pour projecteur de vehicule
FR0312833 2003-10-31

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JP2005135919A (ja) 2005-05-26
US7604385B2 (en) 2009-10-20
US7347600B2 (en) 2008-03-25
FR2861831B1 (fr) 2006-01-20
US20080137358A1 (en) 2008-06-12
FR2861831A1 (fr) 2005-05-06
JP4773705B2 (ja) 2011-09-14
US20050094402A1 (en) 2005-05-05

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