EP1843085A1 - Lighting module for the headlights of an automobile and headlight comprising such a module - Google Patents
Lighting module for the headlights of an automobile and headlight comprising such a module Download PDFInfo
- Publication number
- EP1843085A1 EP1843085A1 EP07290389A EP07290389A EP1843085A1 EP 1843085 A1 EP1843085 A1 EP 1843085A1 EP 07290389 A EP07290389 A EP 07290389A EP 07290389 A EP07290389 A EP 07290389A EP 1843085 A1 EP1843085 A1 EP 1843085A1
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- European Patent Office
- Prior art keywords
- reflector
- folder
- module
- focus
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 238000010276 construction Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 4
- 229920000297 Rayon Polymers 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000004313 glare Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000002964 rayon Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000004438 eyesight Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000287107 Passer Species 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- 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
- F21S41/10—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
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/151—Light emitting diodes [LED] arranged in one or more lines
-
- 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
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
Definitions
- a lighting module of this type is known, for example according to the patent US 6,966,675 .
- Such a module gives satisfaction with the light beam obtained, but poses integration problems in the vehicle body.
- the second reflector, of parabolic type whose dimensions are relatively large is in the upper part which generally corresponds to a smaller area because of the shape of the mirror of the projector, imposed by the style of the body of the vehicle, hence a problem of integration in it.
- a first object of the invention is to provide a lighting module which, while allowing to obtain a cut-off beam, has a smaller footprint in the upper part.
- the light source is generally constituted by at least one light emitting diode.
- several diodes are used arranged in the same plane and aligned to facilitate connections by welding and cooling of the diodes. This results in a significant dimension of the printed circuit board (PCB or Printed Circuit Board) in the transverse direction of alignment and, again, an integration problem for a projector composed of several modules juxtaposed.
- PCB printed circuit board
- Another object of the invention is to provide a lighting module of the kind defined above which can be easily combined with other modules to allow to form a projector in a reduced transverse size.
- the lighting module remains relatively simple and economical manufacturing.
- the light source may be located in the middle plane of the folder.
- the characteristic concerned can be expressed as follows: the folder is arranged so as to let the light rays, coming from the first reflector, intersect the (substantially) horizontal plane containing the axis optic between the focus and the top of the second reflector.
- the first ellipsoidal reflector turns its concave reflecting surface forward and the source illuminates towards the rear, while the folder has a reflective surface facing the first reflector, the lower edge of the Folder constituting the cutting edge.
- the average plane of the folder forms an angle less than 90 °, in particular about 45 °, with the optical axis.
- the light source may be constituted by at least one rear-facing light-emitting diode, and a finned radiator, for dissipating the heat produced by the diode (s), is turned forward.
- the cutting edge of the folder may be bent, in a plane perpendicular to the folder, along a convex line lowering on either side of a vertex at a horizontal tangent, to make the cut line of the given beam rectilinear. by the module.
- the light source is arranged to illuminate forwards while the first reflector is rotated to reflect backward, the source being located at the first focus of the first reflector whose second focus is located more in backward than the first; a reflecting mirror is disposed below the source to intercept the light rays heading towards the focus, the rays being reflected to converge at a focal point which constitutes the focus of the assembly formed by the reflector and the mirror, focal point being merged with, or adjacent to, the focus of the second parabolic reflector.
- the module may comprise, in addition to the first reflector, at its upper end, an ellipsoidal reflector sector having its first focus coinciding with the first focus of the first reflector and its second focus coinciding with the focal point, this sector making it possible to recover light emitted by the source towards the bottom of the first reflector (on the opposite side to the folder).
- the folder is arranged to close the elliptical mirror forward, the light source illuminating forwards.
- the average plane of the folder forms an angle with the plane of the source, the cutting edge of the folder being formed by its lower edge passing through the focus of the second reflector.
- the cutting edge of the folder can be rectilinear and the second reflector is then a parabolic cylinder.
- the cutting edge of the folder can be bent, substantially in a quarter of sinusoid.
- the invention also relates to a light projector comprising in the lower part at least one module as defined above.
- the illuminated headlamp may comprise, at the top, a module having a light source illuminating forwards, an ellipsoidal type reflector situated in front of the source and reflecting the light towards the rear, the light source being located in a plane parallel to the folder of the lower module, and forward, the plane of the source containing a folder located above the source, the upper edge of the folder constituting the cutting edge of the high module, which comprises a second reflector type parabolic located above the first reflector.
- the light sources of the high and low modules are advantageously constituted by two diodes, or series of light-emitting diodes arranged on opposite faces of the same support.
- the light projector comprises at least one module at the bottom, the light source is arranged to illuminate forwards, and the light sources of the low and high modules are constituted by two diodes, or series of diodes. electroluminescent devices arranged on the same face of a printed circuit support. The diodes are preferably aligned.
- the first reflectors of the low and high modules of the projector are arranged substantially at the same level in the vertical direction so that a dead zone, created in the beam by these reflectors, has a reduced height.
- the projector can have a light function of reduced height in front of the dead zone.
- the projector comprises two sets of several superimposed modules.
- a lighting module M for a motor vehicle headlamp provided to give a cut-off beam, including a coded beam.
- the module is shown in position mounted on a vehicle, to illuminate forwards, that is to say to the right according to Fig.1, the optical axis of the module being horizontal.
- the module comprises a light source S constituted by at least one light emitting diode 1 which illuminates towards a first reflector R1 of ellipsoidal type, constituted by a portion of ellipsoid, or of a surface close to an ellipsoid, rotating its concave reflecting surface towards the 'before.
- This reflector R1 comprises a first focus F1 to which (or in the vicinity of) is disposed the source S, which illuminates towards the rear, and a second focus F2 located on or in the vicinity of the optical axis A of the module.
- a folder B essentially flat according to FIG. 1, has a reflective surface facing the first reflector R1.
- the average plane of the folder B forms an angle ⁇ with the optical axis A.
- this angle ⁇ is less than 90 °, in particular about 45 °.
- the source luminous S is located in a plane containing folder B.
- the term "plane of the source” designates a plane passing through the source and orthogonal to the mean direction of the source radiation.
- the lower edge C of the folder constitutes the cutting edge.
- a second reflector R2 of parabolic type, is arranged so as to reflect forwards the cut-off beam of the module.
- the focus ⁇ of the second reflector is coincident with the second focus F2 of the first reflector R1, or located in its vicinity.
- the optical axis A of the module is constituted by the optical axis of the second reflector R2 coincides with the geometric axis of this reflector.
- the reflector R2 may consist only of a surface portion which stops before the geometric vertex 2 of the parabolic section located on the geometric axis.
- the cutting edge C of the folder passes through the focus ⁇ of the second reflector or in its vicinity.
- the image of the edge C given by the reflector R2 determines the cutoff line of the light beam of the module.
- the folder B is arranged so as to pass directly light rays such as ⁇ 1 which intersect the optical axis A of the second reflector R2 between the focus ⁇ and the top 2 of the second reflector.
- the radius ⁇ 1 comes from the first reflector R1, after reflection of a ray i1 from the source S. Such a radius ⁇ 1 is reflected in ⁇ 1 by R2 forward in a direction that deviates from the optical axis A of the back to the front.
- the second reflector R2 is located below the horizontal plane passing through the optical axis A, when it is in place on the vehicle. Under these conditions, the reflected ray ⁇ 1 is directed downwards below the cut-out constituted by the image of the edge C given by the reflector R2. The reflected ray ⁇ 1 will not be a source of glare for a driver coming in the opposite direction.
- This radius ⁇ 3 is reflected by the second reflector R2 according to a ray ⁇ 3 towards the front which deviates from the optical axis A and is therefore descending.
- the second reflector R2 parabolic type whose dimensions are larger than those of the first Reflector R1, is in the lower part and is easier to integrate into a body considering the curve generally found on vehicles.
- the beam remains of the cut-off type below a line at least partly horizontal, to avoid the glare of a driver coming in the opposite direction.
- the optical surfaces of the module can be simple, ellipsoid and paraboloid. Control of the distribution of light is effected by deformations of the collector reflector R1, and the shape of the cut is determined by the edge C of the folder, "imaged" by the output paraboloid R2.
- a radiator (4) with vanes, to dissipate the heat produced by the diodes, is turned towards the front. This arrangement creates a style effect, the radiator 4 being visible to an observer located in front of the vehicle.
- Fig. 2 is a schematic sectional view of a projector with, at the bottom, a module M similar to that of FIG. 1, having a second reflector R2 located below the horizontal plane passing through the optical axis.
- the projector is provided, at the top, with a module H of the type described in the patent US 6,966,675 .
- the module H comprises a light source 5, preferably formed by one or more light-emitting diodes, illuminating towards the front, and a reflector 6 of ellipsoidal type situated in front of the source 5 and reflecting the light towards the rear.
- the light source 5 is located in a plane parallel to the folder B of the lower module M, and in front.
- the plane of the source 5 contains a folder 7 located above the source 5.
- the upper edge 8 of the folder 7 constitutes the cutting edge of the module H, which comprises a second reflector 9 parabolic type.
- the reflector 9 is located above the first reflector 6 and the optical axis 10 of the module H coincides with the optical axis of the reflector 9.
- the optical axis 10 is parallel to the optical axis A.
- the cutting edge 8 of the folder 7 is at the focus of the reflector 9 coincides with the second focus of the reflector 6.
- the source 5 is at the first focus of the reflector 6.
- the first reflectors R1 and 6 are arranged substantially at the same level in the vertical direction so that a dead zone 11, created in the beam by these reflectors, has a reduced height. It is possible to install ahead of this dead zone 11 a function reduced height lighting for example a function DRL (daylighting projector).
- a function DRL daylighting projector
- the light-emitting diodes 1, 5, as well as the associated folders B and 7, are respectively disposed on two opposite faces of the same support 12.
- the printed circuit boards (PCB) for each of the diodes 1, 5 are thus separated and located on both opposite sides of the support 12.
- the bundle of the bottom module M has a convex cut line upwards.
- the cutoff edge 8 is rectilinear, the cutoff line of the resulting beam has a concave shape upwards, substantially in V.
- the cutoff line of the beam given by the low module M can be made rectilinear by bending the edge of the folder C in a plane 13 (FIG. 3) perpendicular to the folder and containing its "imaged" edge.
- This curved edge 14, viewed from the front, is illustrated in FIG. 5 and corresponds substantially to a portion of sinusoid whose vertex, horizontal tangent, is located in the vicinity of the optical axis of the module M.
- the lateral ends of the edge 14 admit a substantially horizontal tangent.
- the edge of the folder would be bent in the opposite direction to the edge 14.
- the solution of FIG. 2 makes it possible to obtain a high luminous flux.
- the transverse bulk is relatively small compared to a solution consisting in juxtaposing two high modulus modules H.However, the head-to-toe arrangement of the light-emitting diodes 1, 5 requires two printed circuits, one on each side of the support 12, this which leads to additional manufacturing costs.
- the light-emitting diode 1 is arranged to illuminate forwards, while the first reflector R1 of ellipsoidal type is rotated to reflect backward.
- Diode 1 is located at the first focus F1 of the reflector R1 whose second focus F2 is located further back than the first.
- a mirror 16, essentially flat, vertical, is disposed below the diode 1 substantially in its plane, to intercept the light rays heading towards the focus F2. The rays are reflected to converge in a focal point F'2 which corresponds to the image of F2 given by the mirror 16.
- This focal point F'2 which constitutes the focus of the assembly formed by the reflector R1 and the mirror 16, is confused with the, or neighbor of, the focus ⁇ of the second parabolic reflector R2 found in the lower part.
- the folder B is located in a substantially vertical plane with its cutting edge C constituted by its lower edge passing through the focus ⁇ .
- an ellipsoidal reflector sector 17 having its first focal point coinciding with F1 and its second focal point coinciding with the point F'2 may be provided.
- This sector 17 makes it possible to recover light emitted by the diode 1 in directions close to the vertical and which, if it were reflected by R1, would be intercepted by the support of the diode 1, and would be lost.
- the embodiment according to FIG. 6 makes it possible to have the light-emitting diode 1 turned forward so that by combining the module of FIG. 6 with a high module such as H of FIG. 2, the light-emitting diodes of the two modules all illuminate forwards and can be installed on the same side of a printed PCB. Manufacturing is simplified, especially for making electrical connections. The evacuation of the heat released by the diodes can be provided by a traditional radiator located on the opposite side of the PCB to the diodes. However, all the reflectors according to Fig.6 is relatively complicated and can not be demolded at one time.
- Fig.7 shows an advantageous embodiment in which the relative position of the folder B and the other surfaces of the reflectors R1, R2 is modified. The manufacturing advantages mentioned above are preserved.
- the ellipsoid type reflector R1 and the parabolic type reflector R2 retain substantially the same relative positions as in the previous embodiments, but the folder B comes, as it were, to close the front part of the reflector R1.
- the average plane of the folder B forms with the optical axis A an acute angle ⁇ .
- the cutting edge C of the folder passes through the focus ⁇ of the reflector R2 coincides, or substantially coincides, with the second focus F2 of the reflector R1.
- Folder B from its cutting edge C, rises forward to join the lower edge of the reflector R1.
- the light emitting diode 1 is located at the first focus F1 of the reflector R1, and illuminates towards the front, in the direction of this reflector R1.
- ⁇ is the distance between the horizontal lines touching the ends of the reflector R2 and f the focal length of the reflector R2. This distance f corresponds to the distance between the focus ⁇ and the vertex 2 of this reflector.
- the focal length f is determined by the reflection of the last radius ⁇ d (Fig.7).
- the angle ⁇ is then determined by the reflection of the first radius ⁇ p along the optical axis A.
- the angle ⁇ of a strictly positive angle ⁇ (preferably 10 °) is increased in order to improve the flow efficiency. It is thus possible to recover some rays which, if not, are reflected towards the rear and the support of the diode 1.
- the folder B taking into account its orientation, realizes the symmetry of the concentration spot.
- the second focus F2 in a plane that contains neither nor is perpendicular to any of the axes of the collector ellipsoid R1.
- the light beam must be deformed.
- deformation of the primary mirror R1 is provided.
- Controlling the cutting of the beam, provided by the cutting edge C, can be performed as follows, in the case of a flat-cut light beam.
- the surfaces searched for are unique and can be determined by explicit parametric equations. We thus obtain beams to sharp cut and whose distribution is adjustable by the shape given to the edge C of the folder.
- Fig. 8 schematically illustrates in perspective a module as previously defined with folder B whose cutoff edge C is rectilinear.
- the output reflector R2 is a parabolic cylinder.
- Fig.9 illustrates the isolux curves L8 obtained on a screen placed at a determined distance from the module. The network of curves of Fig.9 shows that the light beam of the module is relatively concentrated.
- FIG. 10 illustrates an alternative embodiment of the three-surface conjugate module according to which the cut-off edge C of the folder is curved substantially along a quarter of a sinusoid.
- the L10 isolux network of the light beam produced by such a module, illustrated in FIG. 11, shows that the beam is more spread out than in the case of the module of FIG.
- the third embodiment of Figs. 7 to 11 provides a clean cut and eliminates the risk of fuzzy cut and glare.
- For the manufacture of the module through the presence of a drawer in the injection tool, it is possible to mold all surfaces in one piece.
- FIG. 12 illustrates a set of two modules M1 and H1 according to which the diodes 1 and 5 are situated on one side of the support, on the same printed circuit, contrary to the case of FIG.
- the cooling of the diodes 1 and 5 can then be carried out conventionally by one or more radiator elements 18 arranged at the rear of the diode support.
- Fig.13 illustrates in side view, the two reflectors R1 and R2 and the folder C which closes the lower part of the reflector R1.
- the cuts of the folder B by orthogonal planes at the cutoff edge C are straight lines d1, d2, d3 which, in side view, are parallel.
- Fig.14 illustrates schematically in front view a projector P composed of three high modules H1, H2, H3 and three low modules M1, M2, M3 according to the invention.
- the projector P thus comprises two superposed rows of modules, substantially symmetrical to one another with respect to a median horizontal plane.
- the transverse bulk is relatively small for a projector whose luminous flux is high compared to a projector which, to produce the same luminous flux, would comprise six modules of the high module type, juxtaposed in a single row.
- a light band is essentially produced, with a dark band located on the side of the light band opposite to the second reflector. Such a dark band can be masked, in particular by implementing additional lighting functions.
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- 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)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
L'invention est relative à un module d'éclairage, pour projecteur lumineux de véhicule automobile, prévu pour donner un faisceau à coupure, notamment un faisceau code, ce module admettant un axe optique et étant du genre de ceux qui comprennent :
- au moins une source lumineuse,
- un premier réflecteur, de type ellipsoïdal, ayant un premier foyer auquel, ou au voisinage duquel, la source lumineuse est disposée pour éclairer vers le premier réflecteur, et un deuxième foyer situé sur l'axe optique du module ;
- une plieuse ayant une surface réfléchissante et un bord de coupure,
- et un deuxième réflecteur, de type parabolique, pour produire vers l'avant le faisceau à coupure du module, le foyer du deuxième réflecteur étant confondu avec le, ou situé au voisinage du, second foyer du premier réflecteur, l'axe optique du second réflecteur étant confondu avec l'axe optique du module, et le bord de coupure de la plieuse passant par le foyer du deuxième réflecteur, ou à son voisinage.
- at least one light source,
- a first reflector, of ellipsoidal type, having a first focus to which, or in the vicinity of, the light source is arranged to illuminate towards the first reflector, and a second focus located on the optical axis of the module;
- a folder having a reflecting surface and a cutting edge,
- and a second reflector, of parabolic type, for producing the cut-off beam of the module forward, the focus of the second reflector being coincident with, or in the vicinity of, the second focus of the first reflector, the optical axis of the second reflector being coincident with the optical axis of the module, and the cutting edge of the folder passing through the focus of the second reflector, or in its vicinity.
Un module d'éclairage de ce type est connu, par exemple d'après le brevet
Un premier but de l'invention est de fournir un module d'éclairage qui, tout en permettant d'obtenir un faisceau à coupure, présente un encombrement moindre en partie haute.A first object of the invention is to provide a lighting module which, while allowing to obtain a cut-off beam, has a smaller footprint in the upper part.
La source lumineuse est généralement constituée par au moins une diode électroluminescente. Pour obtenir un flux lumineux satisfaisant, on utilise plusieurs diodes disposées dans un même plan et alignées pour faciliter les connexions par soudure et le refroidissement des diodes. Il en résulte une dimension non négligeable du circuit imprimé (PCB ou Printed Circuit Board) selon la direction transversale d'alignement et, de nouveau, un problème d'intégration pour un projecteur composé de plusieurs modules juxtaposés.The light source is generally constituted by at least one light emitting diode. To obtain a satisfactory luminous flux, several diodes are used arranged in the same plane and aligned to facilitate connections by welding and cooling of the diodes. This results in a significant dimension of the printed circuit board (PCB or Printed Circuit Board) in the transverse direction of alignment and, again, an integration problem for a projector composed of several modules juxtaposed.
Un autre but de l'invention est de fournir un module d'éclairage du genre défini précédemment qui puisse se combiner aisément avec d'autres modules pour permettre de former un projecteur sous un encombrement transversal réduit.Another object of the invention is to provide a lighting module of the kind defined above which can be easily combined with other modules to allow to form a projector in a reduced transverse size.
Il convient enfin que le module d'éclairage reste d'une fabrication relativement simple et économique.Finally, it is appropriate that the lighting module remains relatively simple and economical manufacturing.
Selon l'invention, un module d'éclairage pour projecteur lumineux de véhicule automobile, du genre défini précédemment, est tel que :
- la plieuse est disposée de manière à laisser passer les rayons lumineux, provenant du premier réflecteur, qui coupent, en projection orthogonale dans le plan sensiblement vertical comprenant l'axe optique, l'axe optique du deuxième réflecteur entre foyer et sommet du deuxième réflecteur, et à réfléchir les rayons provenant du premier réflecteur qui couperaient l'axe optique du deuxième réflecteur du côté opposé au sommet par rapport au foyer de ce deuxième réflecteur, de sorte que les rayons réfléchis vers l'avant par le deuxième réflecteur s'écartent de son axe optique,
- et le second réflecteur est situé au-dessous du plan horizontal passant par l'axe optique, lorsque le module est en place sur le véhicule.
- the folder is arranged so as to let the light rays, coming from the first reflector, cut, in orthogonal projection in the substantially vertical plane comprising the optical axis, the optical axis of the second reflector between focus and vertex of the second reflector, and reflecting the rays from the first reflector which would intersect the optical axis of the second reflector on the opposite side to the vertex with respect to the focus of the second reflector, so that the rays reflected forwardly by the second reflector deviate from its optical axis,
- and the second reflector is located below the horizontal plane passing through the optical axis, when the module is in place on the vehicle.
La source lumineuse peut être située dans le plan moyen de la plieuse.The light source may be located in the middle plane of the folder.
L'expression utilisée plus haut, « en projection orthogonale dans le plan sensiblement vertical comprenant l'axe optique », est une vision en deux dimensions qui est simple à exprimer.The expression used above, "in orthogonal projection in the substantially vertical plane comprising the optical axis", is a two-dimensional vision that is simple to express.
En restant dans une vision en trois dimensions, la caractéristique concernée peut être exprimée de la façon suivante : la plieuse est disposée de manière à laisser passer les rayons lumineux, provenant du premier réflecteur, qui coupent le plan (sensiblement) horizontal contenant l'axe optique entre le foyer et le sommet du second réflecteur.By remaining in a three-dimensional vision, the characteristic concerned can be expressed as follows: the folder is arranged so as to let the light rays, coming from the first reflector, intersect the (substantially) horizontal plane containing the axis optic between the focus and the top of the second reflector.
Selon un premier mode de réalisation, le premier réflecteur de type ellipsoïdal tourne sa surface réfléchissante concave vers l'avant et la source éclaire vers l'arrière, tandis que la plieuse présente une surface réfléchissante tournée vers le premier réflecteur, le bord inférieur de la plieuse constituant le bord de coupure.According to a first embodiment, the first ellipsoidal reflector turns its concave reflecting surface forward and the source illuminates towards the rear, while the folder has a reflective surface facing the first reflector, the lower edge of the Folder constituting the cutting edge.
De préférence le plan moyen de la plieuse forme un angle inférieur à 90°, en particulier d'environ 45°, avec l'axe optique.Preferably the average plane of the folder forms an angle less than 90 °, in particular about 45 °, with the optical axis.
La source lumineuse peut être constituée par au moins une diode électroluminescente tournée vers l'arrière, et un radiateur à ailettes, pour dissiper la chaleur produite par la (les) diode(s), est tourné vers l'avant.The light source may be constituted by at least one rear-facing light-emitting diode, and a finned radiator, for dissipating the heat produced by the diode (s), is turned forward.
Le bord de coupure de la plieuse peut être courbé, dans un plan perpendiculaire à la plieuse, selon une ligne convexe s'abaissant de part et d'autre d'un sommet à tangente horizontale, pour rendre rectiligne la ligne de coupure du faisceau donnée par le module.The cutting edge of the folder may be bent, in a plane perpendicular to the folder, along a convex line lowering on either side of a vertex at a horizontal tangent, to make the cut line of the given beam rectilinear. by the module.
Selon un deuxième mode de réalisation, la source lumineuse est disposée pour éclairer vers l'avant tandis que le premier réflecteur est tourné pour réfléchir vers l'arrière, la source étant située au premier foyer du premier réflecteur dont le deuxième foyer est situé plus en arrière que le premier ; un miroir de renvoi est disposé au-dessous de la source pour intercepter les rayons lumineux se dirigeant vers le foyer, les rayons étant réfléchis pour converger en un point focal qui constitue le foyer de l'ensemble formé par le réflecteur et le miroir, ce point focal étant confondu avec le, ou voisin du, foyer du deuxième réflecteur parabolique.According to a second embodiment, the light source is arranged to illuminate forwards while the first reflector is rotated to reflect backward, the source being located at the first focus of the first reflector whose second focus is located more in backward than the first; a reflecting mirror is disposed below the source to intercept the light rays heading towards the focus, the rays being reflected to converge at a focal point which constitutes the focus of the assembly formed by the reflector and the mirror, focal point being merged with, or adjacent to, the focus of the second parabolic reflector.
Le module peut comporter, en complément du premier réflecteur, à son extrémité haute, un secteur réflecteur ellipsoïdal ayant son premier foyer confondu avec le premier foyer du premier réflecteur et son deuxième foyer confondu avec le point focal, ce secteur permettant de récupérer de la lumière émise par la source vers le fond du premier réflecteur (du côté opposé à la plieuse).The module may comprise, in addition to the first reflector, at its upper end, an ellipsoidal reflector sector having its first focus coinciding with the first focus of the first reflector and its second focus coinciding with the focal point, this sector making it possible to recover light emitted by the source towards the bottom of the first reflector (on the opposite side to the folder).
Selon un troisième mode de réalisation, la plieuse est disposée de manière à fermer le miroir elliptique vers l'avant, la source lumineuse éclairant vers l'avant.According to a third embodiment, the folder is arranged to close the elliptical mirror forward, the light source illuminating forwards.
Le plan moyen de la plieuse forme un angle avec le plan de la source, le bord de coupure de la plieuse étant formé par son bord inférieur passant par le foyer du second réflecteur.The average plane of the folder forms an angle with the plane of the source, the cutting edge of the folder being formed by its lower edge passing through the focus of the second reflector.
De préférence, les surfaces des deux réflecteurs et de la plieuse sont des surfaces conjuguées telles que :
- le premier réflecteur, ou miroir collecteur, transforme une onde sphérique issue du centre de la source en une surface d'onde se réduisant au bord avant de la plieuse, formant une courbe en deux dimensions ;
- le deuxième réflecteur, ou miroir de renvoi, transforme la surface d'onde précédente en une onde cylindrique d'axe vertical admettant le bord avant de la plieuse comme section droite ;
- la plieuse est une surface réglée constituée d'une famille de droites perpendiculaires à son bord avant et faisant un angle constant avec le plan du repère de construction.
- the first reflector, or collector mirror, transforms a spherical wave coming from the center of the source into a wave surface reducing to the front edge of the folder, forming a two-dimensional curve;
- the second reflector, or reflecting mirror, transforms the preceding wave surface into a cylindrical wave of vertical axis admitting the front edge of the folder as a straight section;
- the folder is a controlled surface consisting of a family of straight lines perpendicular to its front edge and making a constant angle with the plane of the construction mark.
Le bord de coupure de la plieuse peut être rectiligne et le deuxième réflecteur est alors un cylindre parabolique.The cutting edge of the folder can be rectilinear and the second reflector is then a parabolic cylinder.
Le bord de coupure de la plieuse peut être courbé, sensiblement suivant un quart de sinusoïde.The cutting edge of the folder can be bent, substantially in a quarter of sinusoid.
L'invention concerne également un projecteur lumineux comprenant en partie basse au moins un module tel que défini précédemment.The invention also relates to a light projector comprising in the lower part at least one module as defined above.
Le projecteur lumineux peut comporter, en partie haute, un module ayant une source lumineuse éclairant vers l'avant, un réflecteur de type ellipsoïdal situé en avant de la source et réfléchissant la lumière vers l'arrière, la source lumineuse étant située dans un plan parallèle à la plieuse du module inférieur, et en avant, le plan de la source contenant une plieuse située au-dessus de la source, le bord supérieur de la plieuse constituant le bord de coupure du module haut, lequel comporte un deuxième réflecteur de type parabolique situé au-dessus du premier réflecteur.The illuminated headlamp may comprise, at the top, a module having a light source illuminating forwards, an ellipsoidal type reflector situated in front of the source and reflecting the light towards the rear, the light source being located in a plane parallel to the folder of the lower module, and forward, the plane of the source containing a folder located above the source, the upper edge of the folder constituting the cutting edge of the high module, which comprises a second reflector type parabolic located above the first reflector.
Les sources lumineuses des modules haut et bas sont avantageusement constituées par deux diodes, ou séries de diodes électroluminescentes disposées sur des faces opposées d'un même support.The light sources of the high and low modules are advantageously constituted by two diodes, or series of light-emitting diodes arranged on opposite faces of the same support.
Selon un autre mode de réalisation, le projecteur lumineux comprend en partie basse au moins un module, la source lumineuse est disposée pour éclairer vers l'avant, et les sources lumineuses des modules bas et haut sont constituées par deux diodes, ou séries de diodes électroluminescentes disposées sur la même face d'un support de circuit imprimé. Les diodes sont de préférence alignées.According to another embodiment, the light projector comprises at least one module at the bottom, the light source is arranged to illuminate forwards, and the light sources of the low and high modules are constituted by two diodes, or series of diodes. electroluminescent devices arranged on the same face of a printed circuit support. The diodes are preferably aligned.
Avantageusement, les premiers réflecteurs des modules bas et haut du projecteur sont disposés sensiblement au même niveau suivant la direction verticale de sorte qu'une zone morte, créée dans le faisceau par ces réflecteurs, a une hauteur réduite. Le projecteur peut comporter en avant de la zone morte une fonction d'éclairage de hauteur réduite.Advantageously, the first reflectors of the low and high modules of the projector are arranged substantially at the same level in the vertical direction so that a dead zone, created in the beam by these reflectors, has a reduced height. The projector can have a light function of reduced height in front of the dead zone.
Selon une réalisation avantageuse, le projecteur comporte deux ensembles de plusieurs modules superposés.According to an advantageous embodiment, the projector comprises two sets of several superimposed modules.
L'invention consiste, mises à part les dispositions exposées ci-dessus, en un certain nombre d'autres dispositions dont il sera plus explicitement question ci-après à propos d'exemples de réalisation décrits avec références aux dessins annexés, mais qui ne sont nullement limitatifs. Sur ces dessins :
- Fig. 1 est une coupe verticale schématique, passant par l'axe optique, d'un module selon l'invention.
- Fig. 2 est une coupe schématique, semblable à Fig. 1, d'un ensemble de deux modules.
- Fig. 3 est une coupe semblable à Fig. 1, d'une variante du module.
- Fig. 4 est une vue d'une variante de la plieuse à plus grande échelle selon la flèche IV de Fig. 3.
- Fig. 5 est une vue à plus grande échelle suivant la flèche V de Fig. 3 du bord de coupure de la plieuse.
- Fig. 6 est une coupe verticale schématique d'une variante de réalisation du module selon l'invention.
- Fig. 7 est une coupe verticale schématique d'une autre variante du module selon l'invention.
- Fig. 8 est une vue schématique en perspective des réflecteurs et de la plieuse du module selon Fig. 7.
- Fig. 9 illustre le réseau de courbes isolux obtenu avec le module de Fig. 8.
- Fig. 10 montre, semblablement à Fig. 8, une variante de réalisation.
- Fig. 11 illustre le réseau de courbes isolux obtenu avec le module de Fig. 10.
- Fig. 12 est une coupe verticale schématique d'un ensemble de deux modules superposés.
- Fig. 13 est une vue de côté des réflecteurs et de la plieuse d'un module à surfaces conjuguées, et
- Fig. 14 est une vue de face d'un projecteur formé de trois ensembles de modules selon Fig. 12.
- Fig. 1 is a schematic vertical section through the optical axis of a module according to the invention.
- Fig. 2 is a schematic section, similar to FIG. 1, of a set of two modules.
- Fig. 3 is a section similar to FIG. 1, a variant of the module.
- Fig. 4 is a view of a variant of the larger-scale folder according to the arrow IV of FIG. 3.
- Fig. 5 is an enlarged view along the arrow V of FIG. 3 of the cutting edge of the folder.
- Fig. 6 is a schematic vertical section of an alternative embodiment of the module according to the invention.
- Fig. 7 is a schematic vertical section of another variant of the module according to the invention.
- Fig. 8 is a schematic perspective view of the reflectors and the folder of the module according to FIG. 7.
- Fig. 9 illustrates the network of isolux curves obtained with the module of FIG. 8.
- Fig. 10 shows, similarly to FIG. 8, an alternative embodiment.
- Fig. 11 illustrates the network of isolux curves obtained with the module of FIG. 10.
- Fig. 12 is a schematic vertical section of a set of two superposed modules.
- Fig. 13 is a side view of the reflectors and the folder of a module with conjugate surfaces, and
- Fig. 14 is a front view of a projector formed of three sets of modules according to FIG. 12.
En se reportant à Fig. 1 on peut voir, schématiquement représenté, un module d'éclairage M, pour projecteur lumineux de véhicule automobile, prévu pour donner un faisceau à coupure, notamment un faisceau code. Le module est représenté en position montée sur un véhicule, pour éclairer vers l'avant, c'est à dire vers la droite selon Fig.1, l'axe optique du module étant horizontal.Referring to Fig. 1 can be seen, schematically shown, a lighting module M for a motor vehicle headlamp, provided to give a cut-off beam, including a coded beam. The module is shown in position mounted on a vehicle, to illuminate forwards, that is to say to the right according to Fig.1, the optical axis of the module being horizontal.
Le module comprend une source lumineuse S constituée par au moins une diode électroluminescente 1 qui éclaire vers un premier réflecteur R1 de type ellipsoïdal, constitué par une portion d'ellipsoïde, ou de surface voisine d'un ellipsoïde, tournant sa surface réfléchissante concave vers l'avant. Ce réflecteur R1 comporte un premier foyer F1 auquel (ou au voisinage duquel) est disposée la source S, qui éclaire vers l'arrière, et un deuxième foyer F2 situé sur, ou au voisinage de, l'axe optique A du module.The module comprises a light source S constituted by at least one
Une plieuse B, essentiellement plane selon Fig. 1, présente une surface réfléchissante tournée vers le premier réflecteur R1. Le plan moyen de la plieuse B forme un angle ω avec l'axe optique A. De préférence, cet angle ω est inférieur à 90°, notamment d'environ 45°. Selon Fig. 1, la source lumineuse S est située dans un plan contenant la plieuse B. L'expression « plan de la source » désigne un plan passant par la source et orthogonal à la direction moyenne du rayonnement de la source. Le bord inférieur C de la plieuse constitue le bord de coupure.A folder B, essentially flat according to FIG. 1, has a reflective surface facing the first reflector R1. The average plane of the folder B forms an angle ω with the optical axis A. Preferably, this angle ω is less than 90 °, in particular about 45 °. According to FIG. 1, the source luminous S is located in a plane containing folder B. The term "plane of the source" designates a plane passing through the source and orthogonal to the mean direction of the source radiation. The lower edge C of the folder constitutes the cutting edge.
Un deuxième réflecteur R2, de type parabolique, est disposé de manière à réfléchir vers l'avant le faisceau à coupure du module. Le foyer ϕ du deuxième réflecteur est confondu avec le second foyer F2 du premier réflecteur R1, ou situé à son voisinage.A second reflector R2, of parabolic type, is arranged so as to reflect forwards the cut-off beam of the module. The focus φ of the second reflector is coincident with the second focus F2 of the first reflector R1, or located in its vicinity.
L'axe optique A du module est constitué par l'axe optique du second réflecteur R2 confondu avec l'axe géométrique de ce réflecteur. Le réflecteur R2 peut n'être constitué que par une portion de surface qui s'arrête avant le sommet géométrique 2 de la section parabolique situé sur l'axe géométrique.The optical axis A of the module is constituted by the optical axis of the second reflector R2 coincides with the geometric axis of this reflector. The reflector R2 may consist only of a surface portion which stops before the
Le bord de coupure C de la plieuse passe par le foyer ϕ du deuxième réflecteur ou à son voisinage. L'image du bord C donnée par le réflecteur R2 détermine la ligne de coupure du faisceau lumineux du module.The cutting edge C of the folder passes through the focus φ of the second reflector or in its vicinity. The image of the edge C given by the reflector R2 determines the cutoff line of the light beam of the module.
La plieuse B est disposée de manière à laisser passer directement des rayons lumineux tels que ρ1 qui coupent l'axe optique A du deuxième réflecteur R2 entre le foyer ϕ et le sommet 2 de ce deuxième réflecteur. Le rayon ρ1 provient du premier réflecteur R1, après réflexion d'un rayon i1 provenant de la source S. Un tel rayon ρ1 est réfléchi en µ1 par R2 vers l'avant selon une direction qui s'écarte de l'axe optique A de l'arrière vers l'avant.The folder B is arranged so as to pass directly light rays such as ρ1 which intersect the optical axis A of the second reflector R2 between the focus φ and the
Le second réflecteur R2 est situé au-dessous du plan horizontal passant par l'axe optique A, lorsqu'il est en place sur le véhicule. Dans ces conditions, le rayon réfléchi µ1 est dirigé vers le bas au-dessous de la coupure constituée par l'image du bord C donnée par le réflecteur R2. Le rayon réfléchi µ1 ne sera donc pas source d'éblouissement pour un conducteur venant en sens opposé.The second reflector R2 is located below the horizontal plane passing through the optical axis A, when it is in place on the vehicle. Under these conditions, the reflected ray μ1 is directed downwards below the cut-out constituted by the image of the edge C given by the reflector R2. The reflected ray μ1 will not be a source of glare for a driver coming in the opposite direction.
Un rayon tel que ρ2 qui affleure le bord de coupure C passe par le foyer ϕ du réflecteur R2 et est réfléchi selon le rayon µ2 parallèle à l'axe optique A.A radius such that ρ2 that is flush with the cutoff edge C passes through the focus φ of the reflector R2 and is reflected along the radius μ2 parallel to the optical axis A.
Un rayon tel que p3, qui couperait l'axe optique A de R2 en un point 3 situé du côté opposé au sommet 2 par rapport au foyer ϕ, est réfléchi par la plieuse B selon un rayon v3 qui coupe l'axe optique A entre le foyer ϕ et le sommet 2. Ce rayon ν3 est réfléchi par le deuxième réflecteur R2 selon un rayon µ3 vers l'avant qui s'écarte de l'axe optique A et qui est donc descendant.A ray such as p3, which would cut the optical axis A of R2 at a
Avec le module de Fig. 1, le deuxième réflecteur R2 de type parabolique, dont les dimensions sont plus importantes que celles du premier réflecteur R1, se trouve en partie basse et est plus facile à intégrer dans une carrosserie compte tenu du galbe généralement constaté sur les véhicules. Le faisceau reste du type à coupure au-dessous d'une ligne au moins en partie horizontale, pour éviter l'éblouissement d'un conducteur venant en sens inverse.With the module of FIG. 1, the second reflector R2 parabolic type, whose dimensions are larger than those of the first Reflector R1, is in the lower part and is easier to integrate into a body considering the curve generally found on vehicles. The beam remains of the cut-off type below a line at least partly horizontal, to avoid the glare of a driver coming in the opposite direction.
Selon l'exemple de Fig. 1, les surfaces optiques du module peuvent être simples, ellipsoïde et paraboloïde. Le contrôle de la répartition de la lumière s'effectue par des déformations du réflecteur collecteur R1, et la forme de la coupure est déterminée par le bord C de la plieuse, "imagée" par le paraboloïde de sortie R2.According to the example of FIG. 1, the optical surfaces of the module can be simple, ellipsoid and paraboloid. Control of the distribution of light is effected by deformations of the collector reflector R1, and the shape of the cut is determined by the edge C of the folder, "imaged" by the output paraboloid R2.
Compte tenu des galbes généralement constatés sur les véhicules et de l'optimisation du flux utile dans les modules, à encombrement donné, on a intérêt à choisir l'angle ω faible, voisin de 45°.Taking into account the generally observed curves on the vehicles and the optimization of the useful flow in the modules, with given dimensions, one has interest to choose the angle ω weak, close to 45 °.
La ou les diodes électroluminescentes 1 étant tournées vers l'arrière, un radiateur 4 à ailettes, pour dissiper la chaleur produite par les diodes, est tourné vers l'avant. Cette disposition permet de créer un effet de style, le radiateur 4 étant visible pour un observateur situé en avant du véhicule.With the light-emitting diode (s) 1 facing towards the rear, a radiator (4) with vanes, to dissipate the heat produced by the diodes, is turned towards the front. This arrangement creates a style effect, the radiator 4 being visible to an observer located in front of the vehicle.
Fig. 2 est une coupe schématique d'un projecteur avec, en partie basse, un module M semblable à celui de Fig. 1, ayant un deuxième réflecteur R2 situé au-dessous du plan horizontal passant par l'axe optique. Le projecteur est muni, en partie haute, d'un module H du type décrit dans le brevet
Avantageusement, les premiers réflecteurs R1 et 6 sont disposés sensiblement au même niveau suivant la direction verticale de sorte qu'une zone morte 11, créée dans le faisceau par ces réflecteurs, a une hauteur réduite. Il est possible d'installer en avant de cette zone morte 11 une fonction d'éclairage de hauteur réduite par exemple une fonction DRL (projecteur d'éclairage de jour).Advantageously, the first reflectors R1 and 6 are arranged substantially at the same level in the vertical direction so that a dead zone 11, created in the beam by these reflectors, has a reduced height. It is possible to install ahead of this dead zone 11 a function reduced height lighting for example a function DRL (daylighting projector).
Les diodes électroluminescentes 1, 5, de même que les plieuses B et 7 associées, sont disposées respectivement sur deux faces opposées d'un même support 12. Les circuits imprimés (PCB) pour chacune des diodes 1, 5 se trouvent donc séparés et situés sur les deux faces opposées du support 12. Avec une telle disposition, pour dissiper la chaleur produite par chacune des diodes, on prévoit un dispositif de refroidissement par soufflage d'air, par exemple par des passages (non représentés) à l'intérieur du support 12.The light-emitting
Si le bord de coupure C de la plieuse B est rectiligne, le faisceau du module bas M présente une ligne de coupure convexe vers le haut. Pour le module haut H, si le bord de coupure 8 est rectiligne, la ligne de coupure du faisceau obtenu présente une forme concave vers le haut, sensiblement en V.If the cutting edge C of the folder B is rectilinear, the bundle of the bottom module M has a convex cut line upwards. For the high module H, if the cutoff edge 8 is rectilinear, the cutoff line of the resulting beam has a concave shape upwards, substantially in V.
La ligne de coupure du faisceau donnée par le module bas M peut être rendue rectiligne en courbant le bord de la plieuse C dans un plan 13 (Fig.3) perpendiculaire à la plieuse et contenant son bord "imagé". Ce bord courbé 14, vu de face, est illustré sur Fig. 5 et correspond sensiblement à une partie de sinusoïde dont le sommet, à tangente horizontale, est situé au voisinage de l'axe optique du module M. Les extrémités latérales du bord 14 admettent une tangente sensiblement horizontale.The cutoff line of the beam given by the low module M can be made rectilinear by bending the edge of the folder C in a plane 13 (FIG. 3) perpendicular to the folder and containing its "imaged" edge. This
Pour rendre rectiligne la ligne de coupure du faisceau donnée par le module H, le bord de la plieuse serait courbé en sens inverse du bord 14.To make the beam cut line given by the module H rectilinear, the edge of the folder would be bent in the opposite direction to the
Pour créer un faisceau lumineux avec une ligne de coupure montant suivant un angle de 15° par rapport à l'horizontale, il est possible de découper une forme correspondante 15, comme illustré sur Fig. 4, dans le bord de coupure C de la plieuse afin de laisser passer les rayons susceptibles d'atteindre la zone à 15° du faisceau.To create a light beam with a cutoff line at an angle of 15 ° to the horizontal, it is possible to cut a
La solution de Fig. 2 permet d'obtenir un flux lumineux élevé. L'encombrement transversal est relativement faible par rapport à une solution consistant à juxtaposer deux modules de type module haut H.Toutefois, la disposition tête-bêche des diodes électroluminescentes 1, 5 nécessite deux circuits imprimés, un de chaque côté du support 12, ce qui entraîne un surcoût de fabrication.The solution of FIG. 2 makes it possible to obtain a high luminous flux. The transverse bulk is relatively small compared to a solution consisting in juxtaposing two high modulus modules H.However, the head-to-toe arrangement of the light-emitting
Selon la réalisation de Fig. 6, la diode électroluminescente 1 est disposée de manière à éclairer vers l'avant, tandis que le premier réflecteur R1 de type ellipsoïdal est tourné pour réfléchir vers l'arrière. La diode 1 est située au premier foyer F1 du réflecteur R1 dont le deuxième foyer F2 est situé plus en arrière que le premier. Un miroir de renvoi 16, essentiellement plan, vertical, est disposé au-dessous de la diode 1 sensiblement dans son plan, pour intercepter les rayons lumineux se dirigeant vers le foyer F2. Les rayons sont réfléchis pour converger en un point focal F'2 qui correspond à l'image de F2 donnée par le miroir 16. Ce point focal F'2, qui constitue le foyer de l'ensemble formé par le réflecteur R1 et le miroir 16, est confondu avec le, ou voisin du, foyer ϕ du deuxième réflecteur parabolique R2 que l'on trouve en partie basse. La plieuse B est située dans un plan essentiellement vertical avec son bord de coupure C constitué par son bord inférieur passant par le foyer ϕ.According to the embodiment of FIG. 6, the light-emitting
On peut prévoir en complément du réflecteur R1, à son extrémité haute, un secteur réflecteur 17 ellipsoïdal ayant son premier foyer confondu avec F1 et son deuxième foyer confondu avec le point F'2. Ce secteur 17 permet de récupérer de la lumière émise par la diode 1 dans des directions proches de la verticale et qui, si elle était réfléchie par R1, serait interceptée par le support de la diode 1, et serait perdue.In addition to the reflector R1, at its upper end, an ellipsoidal reflector sector 17 having its first focal point coinciding with F1 and its second focal point coinciding with the point F'2 may be provided. This sector 17 makes it possible to recover light emitted by the
La réalisation conforme à Fig.6 permet d'avoir la diode électroluminescente 1 tournée ver l'avant de sorte qu'en combinant le module de Fig.6 avec un module haut tel que H de Fig.2, les diodes électroluminescentes des deux modules éclairent toutes vers l'avant et peuvent être installées sur la même face d'un circuit imprimé PCB. La fabrication s'en trouve simplifiée, en particulier pour la réalisation des connexions électriques. L'évacuation de la chaleur dégagée par les diodes peut être assurée par un radiateur traditionnel situé du côté du PCB opposé aux diodes. Toutefois, l'ensemble des réflecteurs selon Fig.6 est relativement compliqué et ne peut être démoulé en une seule fois.The embodiment according to FIG. 6 makes it possible to have the light-emitting
Fig.7 montre une variante de réalisation avantageuse dans laquelle la position relative de la plieuse B et des autres surfaces des réflecteurs R1, R2 est modifiée. Les avantages de fabrication évoqués ci-dessus sont conservés.Fig.7 shows an advantageous embodiment in which the relative position of the folder B and the other surfaces of the reflectors R1, R2 is modified. The manufacturing advantages mentioned above are preserved.
Le réflecteur de type ellipsoïdal R1 et le réflecteur de type parabolique R2 conservent sensiblement les mêmes positions relatives que dans les réalisations précédentes, mais la plieuse B vient, en quelque sorte, fermer la partie avant du réflecteur R1. Le plan moyen de la plieuse B forme avec l'axe optique A un angle aigu β. Le bord de coupure C de la plieuse passe par le foyer ϕ du réflecteur R2 confondu, ou sensiblement confondu, avec le deuxième foyer F2 du réflecteur R1. La plieuse B, à partir de son bord de coupure C, monte vers l'avant pour rejoindre le bord inférieur du réflecteur R1. La diode électroluminescente 1 est située au premier foyer F1 du réflecteur R1, et éclaire vers l'avant, en direction de ce réflecteur R1.The ellipsoid type reflector R1 and the parabolic type reflector R2 retain substantially the same relative positions as in the previous embodiments, but the folder B comes, as it were, to close the front part of the reflector R1. The average plane of the folder B forms with the optical axis A an acute angle β. The cutting edge C of the folder passes through the focus φ of the reflector R2 coincides, or substantially coincides, with the second focus F2 of the reflector R1. Folder B, from its cutting edge C, rises forward to join the lower edge of the reflector R1. The
L'axe géométrique du réflecteur R1 forme un angle ω avec l'axe optique horizontal A et un angle γ = π/2 - ω avec la direction verticale.The geometric axis of the reflector R1 forms an angle ω with the horizontal optical axis A and an angle γ = π / 2 - ω with the vertical direction.
On désigne par Δ la distance entre les lignes horizontales touchant les extrémités du réflecteur R2 et par f la distance focale du réflecteur R2. Cette distance f correspond à la distance entre le foyer ϕ et le sommet 2 de ce réflecteur. Pour Δ et γ fixés, la focale f est déterminée par la réflexion du dernier rayon ρd (Fig.7). L'angle β est alors déterminé par la réflexion du premier rayon ρp suivant l'axe optique A.Δ is the distance between the horizontal lines touching the ends of the reflector R2 and f the focal length of the reflector R2. This distance f corresponds to the distance between the focus φ and the
En pratique on augmente l'angle β d'un angle σ strictement positif (10° de préférence) afin d'améliorer le rendement en flux. Il est ainsi possible de récupérer quelques rayons qui, sinon, sont reflétés vers l'arrière et le support de la diode 1. Selon cette variante de réalisation, la plieuse B, compte tenu de son orientation, réalise la symétrie de la tache de concentration du second foyer F2 dans un plan qui ne contient, ni n'est perpendiculaire à, aucun des axes de l'ellipsoïde collecteur R1. Le faisceau lumineux doit se trouver déformé. Pour maîtriser l'homogénéité du faisceau, on prévoit des déformations du miroir primaire R1.In practice, the angle β of a strictly positive angle σ (preferably 10 °) is increased in order to improve the flow efficiency. It is thus possible to recover some rays which, if not, are reflected towards the rear and the support of the
La maîtrise de la coupure du faisceau, assurée par le bord de coupure C, peut être réalisée comme suit, dans le cas d'un faisceau lumineux à coupure plate.Controlling the cutting of the beam, provided by the cutting edge C, can be performed as follows, in the case of a flat-cut light beam.
On remplace les trois surfaces simples des réflecteurs R1, R2 et de la plieuse B par des surfaces conjuguées telles que :
- le miroir collecteur R1 transforme une onde sphérique issue du centre de la
source 1 en une surface d'onde se réduisant, pour un chemin optique particulier, au bord avant C de la plieuse, formant une courbe en deux dimensions ; - le miroir de renvoi R2 transforme la surface d'onde précédente en une onde cylindrique d'axe vertical admettant le bord avant C de la plieuse comme section droite ;
- la plieuse est une surface réglée constituée d'une famille de droites perpendiculaires à son bord avant C et faisant un angle constant avec le plan (O,x, y) du repère de construction.
- the collector mirror R1 transforms a spherical wave coming from the center of the
source 1 into a reducing wave surface, for a particular optical path, at the front edge C of the folder, forming a two-dimensional curve; - the reflecting mirror R2 transforms the preceding wave surface into a cylindrical wave of vertical axis admitting the front edge C of the folder as a straight section;
- the folder is a controlled surface consisting of a family of straight lines perpendicular to its front edge C and making a constant angle with the plane (O, x, y) of the construction mark.
Dans ces conditions, étant donnés : Δ, ω, la distance λ1 du centre de la diode 1 au centre du bord avant C de la plieuse, et la distance λ2 du centre de la diode 1 au fond du réflecteur collecteur R1,
les surfaces recherchées sont uniques et peuvent être déterminées par des équations paramétriques explicites. On obtient ainsi des faisceaux à coupure très nette et dont la répartition est réglable par la forme donnée au bord C de la plieuse.Under these conditions, given: Δ, ω, the distance λ1 from the center of the
the surfaces searched for are unique and can be determined by explicit parametric equations. We thus obtain beams to sharp cut and whose distribution is adjustable by the shape given to the edge C of the folder.
Fig.8 illustre schématiquement en perspective un module tel que défini précédemment avec plieuse B dont le bord de coupure C est rectiligne. Le réflecteur de sortie R2 est un cylindre parabolique. Fig.9 illustre les courbes isolux L8 obtenues sur un écran placé à distance déterminée du module. Le réseau de courbes de Fig.9 fait apparaître que le faisceau lumineux du module est relativement concentré.Fig. 8 schematically illustrates in perspective a module as previously defined with folder B whose cutoff edge C is rectilinear. The output reflector R2 is a parabolic cylinder. Fig.9 illustrates the isolux curves L8 obtained on a screen placed at a determined distance from the module. The network of curves of Fig.9 shows that the light beam of the module is relatively concentrated.
Fig.10 illustre une variante de réalisation du module à trois surfaces conjuguées selon laquelle le bord de coupure C de la plieuse est courbé, sensiblement suivant un quart de sinusoïde. Le réseau d'isolux L10 du faisceau lumineux produit par un tel module, illustré sur Fig.11, fait apparaître que le faisceau est plus étalé que dans le cas du module de Fig.8.FIG. 10 illustrates an alternative embodiment of the three-surface conjugate module according to which the cut-off edge C of the folder is curved substantially along a quarter of a sinusoid. The L10 isolux network of the light beam produced by such a module, illustrated in FIG. 11, shows that the beam is more spread out than in the case of the module of FIG.
Le troisième mode de réalisation des Fig. 7 à 11 permet d'obtenir une coupure nette et de supprimer les risques de coupure floue et d'éblouissement. Pour la fabrication du module, moyennant la présence d'un tiroir dans l'outillage d'injection, il est possible de mouler toutes les surfaces en une seule pièce.The third embodiment of Figs. 7 to 11 provides a clean cut and eliminates the risk of fuzzy cut and glare. For the manufacture of the module, through the presence of a drawer in the injection tool, it is possible to mold all surfaces in one piece.
Fig.12 illustre un ensemble de deux modules M1 et H1 selon lequel les diodes 1 et 5 sont situées d'un seul côté du support, sur un même circuit imprimé, contrairement au cas de Fig.2. Le refroidissement des diodes 1 et 5 peut alors être effectué de manière classique par un ou plusieurs éléments radiateurs 18 disposés à l'arrière du support de diodes.FIG. 12 illustrates a set of two modules M1 and H1 according to which the
Fig.13 illustre en vue de côté, les deux réflecteurs R1 et R2 et la plieuse C qui ferme la partie inférieure du réflecteur R1. Les coupes de la plieuse B par des plans orthogonaux au bord de coupure C sont des droites d1, d2, d3 qui, en vue de côté, sont parallèles.Fig.13 illustrates in side view, the two reflectors R1 and R2 and the folder C which closes the lower part of the reflector R1. The cuts of the folder B by orthogonal planes at the cutoff edge C are straight lines d1, d2, d3 which, in side view, are parallel.
Fig.14 illustre schématiquement en vue de face un projecteur P composé de trois modules hauts H1, H2, H3 et trois modules bas M1, M2, M3 selon l'invention. Le projecteur P comporte ainsi deux rangées superposées de modules, sensiblement symétriques l'une de l'autre par rapport à un plan horizontal médian. L'encombrement transversal est relativement réduit pour un projecteur dont le flux lumineux est élevé par rapport à un projecteur qui, pour produire le même flux lumineux, comporterait six modules du type module haut, juxtaposés dans une seule rangée.Fig.14 illustrates schematically in front view a projector P composed of three high modules H1, H2, H3 and three low modules M1, M2, M3 according to the invention. The projector P thus comprises two superposed rows of modules, substantially symmetrical to one another with respect to a median horizontal plane. The transverse bulk is relatively small for a projector whose luminous flux is high compared to a projector which, to produce the same luminous flux, would comprise six modules of the high module type, juxtaposed in a single row.
En disposant les diodes électroluminescentes sur un même plan pour une production industrielle, sans avoir de fils à souder, on simplifie considérablement la fabrication. On réalise essentiellement une bande lumineuse, avec une bande sombre située du côté de la bande lumineuse opposée au deuxième réflecteur. On peut masquer une telle bande sombre, notamment en implantant des fonctions supplémentaires d'éclairage.By arranging the light-emitting diodes on the same plane for industrial production, without having soldering wires, the manufacture is considerably simplified. A light band is essentially produced, with a dark band located on the side of the light band opposite to the second reflector. Such a dark band can be masked, in particular by implementing additional lighting functions.
Claims (20)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0603062A FR2899668B1 (en) | 2006-04-06 | 2006-04-06 | LIGHTING MODULE FOR A LIGHT PROJECTOR OF A MOTOR VEHICLE, AND PROJECTOR COMPRISING SUCH A MODULE. |
Publications (2)
Publication Number | Publication Date |
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EP1843085A1 true EP1843085A1 (en) | 2007-10-10 |
EP1843085B1 EP1843085B1 (en) | 2010-06-16 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07290389A Active EP1843085B1 (en) | 2006-04-06 | 2007-03-30 | Lighting module for the headlights of an automobile and headlight comprising such a module |
Country Status (6)
Country | Link |
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US (1) | US7543964B2 (en) |
EP (1) | EP1843085B1 (en) |
JP (1) | JP5160130B2 (en) |
AT (1) | ATE471485T1 (en) |
DE (1) | DE602007007144D1 (en) |
FR (1) | FR2899668B1 (en) |
Cited By (8)
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EP2112429A1 (en) * | 2008-04-24 | 2009-10-28 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
EP2112430A1 (en) * | 2008-04-24 | 2009-10-28 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
EP2131098A1 (en) * | 2008-06-06 | 2009-12-09 | Valeo Vision | Automotive headlamp |
EP2168812A1 (en) | 2008-09-26 | 2010-03-31 | Valeo Vision | Lighting system for an automobile capable of modifying the emission of a low beam light |
US7832912B2 (en) | 2008-04-24 | 2010-11-16 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
US7883250B2 (en) | 2008-04-24 | 2011-02-08 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
FR2966221A1 (en) * | 2010-08-04 | 2012-04-20 | Valeo Vision | CUTTING LIGHTING MODULE WITH PARABOLIC REFLECTOR ARRANGED ON AN ELLIPTICAL REFLECTOR |
WO2022129625A1 (en) * | 2020-12-18 | 2022-06-23 | Valeo Vision | Motor vehicle headlamp with multiple lighting modules on an inclined common plate |
Families Citing this family (13)
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JP2008258001A (en) * | 2007-04-05 | 2008-10-23 | Koito Mfg Co Ltd | Lamp unit of vehicular headlamp |
FR2917811B1 (en) | 2007-06-25 | 2009-10-02 | Valeo Vision Sa | LIGHTING MODULE FOR MOTOR VEHICLE PROJECTOR |
US7762700B2 (en) * | 2008-05-28 | 2010-07-27 | Osram Sylvania Inc. | Rear-loaded light emitting diode module for automotive rear combination lamps |
JPWO2011077947A1 (en) * | 2009-12-24 | 2013-05-02 | コニカミノルタアドバンストレイヤー株式会社 | Vehicle headlamp |
DE102012202290B4 (en) * | 2012-02-15 | 2014-03-27 | Automotive Lighting Reutlingen Gmbh | Light module for a glare-free motor vehicle high beam |
TWI565605B (en) * | 2012-02-20 | 2017-01-11 | 鴻海精密工業股份有限公司 | Vehicle headlamp modulef |
JP5909698B2 (en) * | 2012-02-27 | 2016-04-27 | パナソニックIpマネジメント株式会社 | Vehicle headlamp |
US9476556B2 (en) | 2013-01-04 | 2016-10-25 | Honda Motor Co., Ltd. | Vehicle headlight assembly |
WO2015107480A1 (en) * | 2014-01-17 | 2015-07-23 | Magna International Inc. | Flexible led lamp assembly |
KR102376089B1 (en) * | 2015-01-16 | 2022-03-18 | 엘지이노텍 주식회사 | Lamp for vehicle |
AT519119B1 (en) * | 2016-11-22 | 2018-04-15 | Zkw Group Gmbh | LIGHTING DEVICE FOR A MOTOR VEHICLE HEADLAMP |
US11454374B2 (en) | 2019-08-01 | 2022-09-27 | Hyundai Motor Company | Illumination apparatus for mobility |
KR20210016166A (en) * | 2019-08-01 | 2021-02-15 | 현대자동차주식회사 | Illumination apparatus for vehicle |
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JP3740635B2 (en) * | 2000-09-28 | 2006-02-01 | スタンレー電気株式会社 | Lighting fixtures for vehicles |
JP2003123520A (en) * | 2001-10-18 | 2003-04-25 | Koito Mfg Co Ltd | Projection type headlamp used for infrared light irradiating lamp |
JP4251941B2 (en) * | 2003-08-08 | 2009-04-08 | 三菱電機株式会社 | head lamp |
JP4044024B2 (en) * | 2003-09-29 | 2008-02-06 | 株式会社小糸製作所 | Vehicle headlamp |
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- 2007-03-30 EP EP07290389A patent/EP1843085B1/en active Active
- 2007-03-30 DE DE602007007144T patent/DE602007007144D1/en active Active
- 2007-04-04 US US11/696,290 patent/US7543964B2/en active Active
- 2007-04-06 JP JP2007100056A patent/JP5160130B2/en active Active
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GB399121A (en) * | 1932-05-13 | 1933-09-28 | Louis Rivier | Lighting device |
EP1434002A1 (en) * | 2002-12-20 | 2004-06-30 | Valeo Vision | Lighting module for vehicle headlight |
EP1528313A2 (en) * | 2003-10-31 | 2005-05-04 | Valeo Vision | Vehicle headlamp with a discharge lamp |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2112429A1 (en) * | 2008-04-24 | 2009-10-28 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
EP2112430A1 (en) * | 2008-04-24 | 2009-10-28 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
US7832912B2 (en) | 2008-04-24 | 2010-11-16 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
US7883250B2 (en) | 2008-04-24 | 2011-02-08 | Ichikoh Industries, Ltd. | Lamp unit for vehicles |
EP2131098A1 (en) * | 2008-06-06 | 2009-12-09 | Valeo Vision | Automotive headlamp |
FR2932245A1 (en) * | 2008-06-06 | 2009-12-11 | Valeo Vision Sas | LIGHTING MODULE FOR MOTOR VEHICLE PROJECTOR |
EP2168812A1 (en) | 2008-09-26 | 2010-03-31 | Valeo Vision | Lighting system for an automobile capable of modifying the emission of a low beam light |
FR2966221A1 (en) * | 2010-08-04 | 2012-04-20 | Valeo Vision | CUTTING LIGHTING MODULE WITH PARABOLIC REFLECTOR ARRANGED ON AN ELLIPTICAL REFLECTOR |
EP2416061A3 (en) * | 2010-08-04 | 2012-08-08 | Valeo Vision | Cut-off lighting module with parabolic reflector placed over an elliptical reflector |
WO2022129625A1 (en) * | 2020-12-18 | 2022-06-23 | Valeo Vision | Motor vehicle headlamp with multiple lighting modules on an inclined common plate |
FR3118120A1 (en) * | 2020-12-18 | 2022-06-24 | Valeo Vison - Service IP | Automotive headlamp with several lighting modules on a common inclined plate. |
Also Published As
Publication number | Publication date |
---|---|
FR2899668B1 (en) | 2009-11-20 |
US20070236951A1 (en) | 2007-10-11 |
ATE471485T1 (en) | 2010-07-15 |
EP1843085B1 (en) | 2010-06-16 |
JP5160130B2 (en) | 2013-03-13 |
DE602007007144D1 (en) | 2010-07-29 |
JP2007280959A (en) | 2007-10-25 |
FR2899668A1 (en) | 2007-10-12 |
US7543964B2 (en) | 2009-06-09 |
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