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EP1666787A1 - Lighting module for vehicle headlamp - Google Patents

Lighting module for vehicle headlamp Download PDF

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Publication number
EP1666787A1
EP1666787A1 EP05292454A EP05292454A EP1666787A1 EP 1666787 A1 EP1666787 A1 EP 1666787A1 EP 05292454 A EP05292454 A EP 05292454A EP 05292454 A EP05292454 A EP 05292454A EP 1666787 A1 EP1666787 A1 EP 1666787A1
Authority
EP
European Patent Office
Prior art keywords
reflector
lens
lighting module
module according
folder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05292454A
Other languages
German (de)
French (fr)
Other versions
EP1666787B1 (en
Inventor
Pierre Albou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Priority to SI200530116T priority Critical patent/SI1666787T1/en
Publication of EP1666787A1 publication Critical patent/EP1666787A1/en
Application granted granted Critical
Publication of EP1666787B1 publication Critical patent/EP1666787B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/27—Thick lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—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

Definitions

  • a lighting module of this type is known, for example according to EP 1 357 334. It makes it possible to obtain a cut-off lighting beam, in particular a code or fog-type beam, without using a cache which makes it lose a part of the luminous flux of the source.
  • the folder is integral with the reflector and its front edge is the cutting edge.
  • the positioning of this cutting edge with respect to the lens must be ensured with precision in order to avoid a chromatism, a blur and / or a random cut position.
  • the positioning accuracy makes it difficult to design and build the assembly means of the reflector and the lens. This precision needs to be improved, particularly from the point of view of constancy from one module to another.
  • a first object of the invention is to economically ensure compliance with the positioning tolerances of the folder relative to the lens, to avoid the chromaticism and disadvantages mentioned above.
  • the reflector is no longer hollow concave wall type and the installation of the light source is relatively delicate, especially to avoid stray refractions.
  • a coating of reflective material should be provided on the outer surface of the elliptical reflector portion, and is exposed to degradations.
  • the flat surface of the folder must also be provided with a reflective coating. The realization in one piece massive reflector and lens complicates the molding and subsequent application of the reflective coating. The invention also aims to avoid such drawbacks.
  • the invention aims to reduce the loss of flux introduced by the folder, and to improve the useful opening of the collector which is limited by the opening of the lens.
  • the position of the cutting edge with respect to the lens is precisely assured.
  • the application of a reflective coating on the reflector can be performed on the inner face of the concave wall.
  • the lens may comprise an upper part, located above the folder, different from the lower part.
  • the upper part may be formed by a convex or biconvex plane lens.
  • This upper part is advantageously stigmatic between a point in the air, located on the cutting edge, and the infinite, or is optionally optimized vis-à-vis the cutting sharpness; this upper part can be focused on the center of the cutting edge.
  • the lower part may have for output a stigmatic surface between a point in the material confounded with the center of the cutting edge, and the infinite.
  • the base of the upper part of the lens has, at the level of the folder, a width greater than that of the lower part.
  • a block of transparent material is secured to the lower part of the lens and extends rearward, this block having a horizontal upper surface, at least in part, which works in total reflection and constitutes the folder, for light rays having entered the block.
  • the rear end face of the block is vertical and perpendicular to the optical axis.
  • the block has substantially a truncated pyramid shape and its width in a direction orthogonal to the optical axis increases from back to front.
  • a plate of transparent material is secured to the rear face of the lens and extends rearwardly, this plate presenting a horizontal lower face provided with a reflective coating which constitutes the folder.
  • the block of transparent material or the plate of transparent material are molded in one piece with the upper part and the lower part of the lens, and are advantageously made of PMMA (polymethyl methacrylate).
  • the lighting module may comprise a second reflector, in particular of elliptical type, hollow concave wall located on the side of the folder opposite the first reflector and turning its concavity towards the first reflector, this second reflector comprising a complementary light source located in the vicinity its first focus, the second focus of the second reflector being located in the vicinity of the cutoff edge, the second light source and the second reflector providing, in combination with the lens, a lighting beam located above the cutoff line so that the meeting of the two beams makes it possible to obtain a road or diurnal beam DRL.
  • a second reflector in particular of elliptical type, hollow concave wall located on the side of the folder opposite the first reflector and turning its concavity towards the first reflector, this second reflector comprising a complementary light source located in the vicinity its first focus, the second focus of the second reflector being located in the vicinity of the cutoff edge, the second light source and the second reflector providing, in combination with the lens, a lighting beam located above the cutoff line
  • the optical axis of the second reflector is inclined from top to bottom, from back to front on the plane of the folder, in particular at an angle of about 20 °.
  • the folder may comprise a reflective coating intervening for rays coming from the second reflector.
  • the invention also relates to any projector comprising at least one lighting module as previously described.
  • a lighting module E for a motor vehicle headlamp clean to produce at least one light beam cutoff.
  • a beam illuminates below a cutoff line which may be horizontal in the case of a fog or broken line shape with a horizontal branch and a rising inclined branch in the case of a code beam.
  • the module E comprises, along a horizontal Y-Y optical axis and parallel to the longitudinal axis of the vehicle, a reflector 1 of elliptical type hollow concave wall 2 concave wall concavity upwards.
  • the reflector 1 is limited at the top by a curve 3 located in a horizontal plane, preferably passing through the optical axis Y-Y.
  • the reflector 1 has a shape that can be likened to a portion of deformed ellipsoid in order to control the horizontal distribution of the light beam. It is like a hull with an opening 4 forward.
  • the reflector 1 comprises a first internal focus F1 and a second focus F2 located in front of the flat opening 4.
  • the reflector 1 is advantageously made of plastic, with a reflective coating deposited on the inner surface of the wall 2.
  • a light source 5, advantageously formed by a light-emitting diode, is arranged in the vicinity of the first focus F1 and lights essentially downward in the concavity of the reflector 1.
  • a convergent lens L is placed in front of the reflector.
  • Means for assembling the lens L with the reflector are provided, but not shown.
  • the lens L comprises an upper part Lh and a lower part Lb different, but integral and injectable in a single piece of transparent material, especially PMMA.
  • the upper part Lh is a convex plane lens, whose flat face is turned towards the rear.
  • this upper part Lh could be formed by a biconvex lens.
  • the lower part Lb is secured to a block 6 of transparent material which extends rearwardly and which is in one piece with the parts Lb and Lh.
  • the block 6 has a horizontal upper surface 7 secured to the front edge of the lens L and extending rearwardly.
  • the rear edge 8 is located in the vicinity of the second focus F2 of the reflector 1.
  • the focus F3 of the lens L is also located in the vicinity of the focus F2 or confused with.
  • the upper part Lh of the lens is stigmatic between the point F3 located in the air, and the infinite.
  • the point F3 is in the middle of the rear edge 8 of the surface 7.
  • the projection of the edge 8 defines the cut.
  • the rear face 9 of the block 7 is vertical.
  • This face 9 may be located in a plane orthogonal to the optical axis Y-Y as illustrated in FIG. 1 and 2, in which case the cutoff edge 8 is a rectilinear segment.
  • the edge 8 may be formed by a curve arc matching the field curvature of the lens, in which case the face 9 is a cylindrical surface portion with vertical generatrices whose directional curve corresponds to the edge 8.
  • the horizontal face 7 works in total reflection on light rays such as ib 1 (FIG 1) having entered the block 6, from the reflector 2.
  • the reflection is thus obtained without the need to deposit a reflective coating on the surface 7.
  • the flux efficiency with the total reflection is higher than that obtained with a reflective coating.
  • the block 7 has a width B, that is to say a dimension in a direction orthogonal to the vertical plane passing through the optical axis, which increases from the rear to the front.
  • the upper part of the block 6 has substantially the shape of a truncated pyramid trunk, rectangular base, the vertical dimension increases from the cut edge 8 to the lens.
  • the base of the block 6 opposite the rear face 9 corresponds to the junction with the lower part Lb.
  • the width of Lb is less than that of the upper part Lh whose base overflows on either side of Lb by zones A1, A2.
  • the lower part Lb has a stigmatic surface 10 output between the focus F4 located in the material of the block 7, geometrically confused with the center of the rear edge 8, and the infinite.
  • the portion Lb extends below the block 6 and gradually joins the lower rear edge of the wall 9 along a face 11 which rises from front to back.
  • the reflected ray ir passes through the focal point F2 of the reflector 2 coincides with the focus F3 of the upper part Lh of the lens L.
  • the ray ie outgoing of the lens Lh is parallel to the optical axis YY, that is to say horizontal, at the cutoff line.
  • a radius i2 coming from a point situated in front of the focus F1 is reflected by the reflector 2 along a radius ir2 which passes behind the focus F2 and intersects the focal plane of the lens Lh above the focus F3.
  • the emergent ray corresponding to ie2 is a descending ray, below the cutoff line, and does not cause glare.
  • a radius i1 coming from a point located behind the focus F1 is reflected in ir1 and falls on the rear face 9 of the block 6 below the focus F3.
  • this ray ir1 would have continued its course to the rear face of the upper part Lh of the lens and the emerging ray would have been ascending, which is not acceptable.
  • the ir1 radius is refracted according to ib1 which is less inclined to the horizontal because the refractive index of the block 6 is greater than that of the air.
  • the radius ib1 undergoes, against the face 7 constituting the folder, a total reflection to give the ic1 descending in the material of the lower part Lb.
  • the radius ie1 which emerges from the lower part Lb is also descending, below the cutoff edge.
  • the ray ir1 which, in the absence of the folder formed by the face 7 would be undesirable, is maintained in the cut-off beam and contributes to increasing the flow of this beam.
  • an optical efficiency of 73% was obtained with a module according to FIG. 1 and 2, against 63% for a hollow module of the state of the art having similar dimensions.
  • the reflection on the folder 7 is total regardless of the angle of incidence of the rays ir, ir1, ir2 on the face 9 because the refractive index of the material of the block 6, PMMA or optical glass , is greater than ⁇ 2, so that the reflection on 7 is total regardless of the angle of incidence on the face 9.
  • Fig. 5 is a diagram illustrating the network of isolux curves (at constant illumination) obtained with a lighting module according to FIG. 1 and 2 on a screen placed at a determined distance, generally 25 m, from the module.
  • the graduations of the horizontal scale define the orientations, in the horizontal plane, of the light rays with respect to the optical axis, while the graduations of the vertical scale correspond to the inclinations, in the vertical plane, of the light rays.
  • the illumination maximum corresponds to the inner curve.
  • the successive curves, whose dimensions increase, correspond to smaller illuminations. From Fig. 5 it appears that the illuminated area is located below a horizontal cut line C which corresponds to the image of the rectilinear edge 8 of the face 9.
  • An angle-shaped cut line could be obtained, for example with a horizontal portion to the left of the vertical axis and a rising portion to the right by providing a folder surface 7 and an edge 8 adapted to the line of contact. desired cut.
  • Fig. 3 shows an alternative embodiment in which we find the different elements of the lighting module of FIG. 1 and 2 with a second reflector 12 of elliptical type concave hollow wall located above the horizontal plane of the folder 7.
  • the concavity of the reflector 12 is turned downwards.
  • a second light source 13, advantageously an up-lighting electroluminescent diode, is arranged at a first internal focus F5 of the reflector 12.
  • the second focus F6 of the reflector 12 coincides with the focus F4 of the lower part Lb of the lens, and is located in the middle of the rear edge 8.
  • the optical axis Y2-Y2 of the reflector 12 is inclined to the horizontal angle ⁇ , in particular of the order of twenty degrees, and deviates from the horizontal from front to back. It is thus possible to clear a space between the reflectors for housing the housings of the diodes constituting the sources 5 and 13 and the thickness of their support circuit.
  • a ray i3 from the focus F5 is reflected along ir3 by the reflector 12 and passes through the focus F6 coincides with the focus F4 of the lens portion Lb.
  • the emerging ray ie3 is parallel to the optical axis Y-Y.
  • a ray i4 coming from a point situated in front of the focus F5 is reflected along the radius ir4 which passes below the focus F6 and meets the rear face 9 of the block 6. This ray is refracted at ib4 and emerges from the part Lb of lens in the form of ascending radius ie4.
  • a ray i5 from a point located behind the F5 focus is reflected along ir5 which passes over the focus F6 and falls on the bender 7.
  • a fraction of this ray ir5 is reflected in ib5 which falls on the back side of the upper part Lh of the lens.
  • the emerging ray ie5 is ascending.
  • the other part of the radius ir5 is refracted and penetrates inside the block 6 to emerge in ip5 which is lost.
  • FIG. 6 is a diagram of the isolux curves obtained with the single source 13 and the second reflector 12. It can be seen that the illumination is essentially above of the cutoff line C.
  • the beams of Figs. 5 and 6 gives a road beam or diurnal beam DRL.
  • a reflective coating may be provided on the face 7 in the embodiment of FIG. 3 to improve the efficiency of the upper portion of the light beam from the source 13 and the reflector 12.
  • Fig. 4 illustrates an alternative embodiment in which a plate of transparent material 14 is secured to the rear face of the lens La and extends rearwardly.
  • the plate 14 has a horizontal bottom face 7a, at least partially, provided with a reflective coating obtained for example by metallization, in particular by deposition of an aluminum layer.
  • the plate 14 is molded in one piece with the La lens, biconvex type according to Fig.4.
  • the plate 14 in vertical section has substantially the shape of a dihedron, its upper planar face deviating from the lower face 7a from the rear to the front. Viewed from above, the plate 14 has a substantially rectangular outline limited, towards the rear, by an edge 8a constituting the cutting edge, in particular rectilinear as in FIG. 2.
  • the light source 5a is located in the extension of the inclined upper face 15.
  • the second focus of the reflector 2a is located on the edge 8a.
  • the operation of the module of FIG. 4 is similar to that described with reference to FIGS. 1 and 2, and is illustrated by three light rays from the source 5a.
  • the rays are all falling or parallel to the optical axis of the lens La.
  • the zone 16 of connection between the blade 14 and the lens La constitutes a dead zone, of reduced dimensions, which does not participate. to the light beam.
  • FIG. 4 allows a lens The less thick than in the previous embodiments.
  • the invention allows good positioning accuracy of the folder and the cutting edge 8, 8a with respect to the lens.
  • the optical efficiency is improved. Reflective coating deposits are removed or reduced. It is possible (Fig. 3) to provide a complementary beam above the cut by simply adding a diode 13 and a reflector 12.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The lighting module, comprising a preferably elliptical reflector (1) with a concave wall (2), a convergent lens, and a reflective surface or bender (7), has the latter joined by its forward edge to the lens and made with a cut-off rear edge. The concave surface of (1) faces upwards and is situated below the level of (7), with a light source (5) shining downwards into the concavity of (1). The lighting module, comprising a preferably elliptical reflector (1) with a concave wall (2), a convergent lens, and a reflective surface or bender (7), has the latter joined by its forward edge to the lens and made with a cut-off rear edge. The concave surface of the reflector faces upwards and is situated, at least for the main part, below the level of the bender, with a light source (5) shining essentially downwards into the concavity of the reflector. The lens consists of an upper section (Lh) located above the bender, and a lower section (Lb) which has a block (6) extending rearwards from it with its upper horizontal surface acting as the bender for light rays entering the block.

Description

L'invention est relative à un module d'éclairage pour projecteur de véhicule automobile propre à produire au moins un faisceau lumineux à coupure, module du genre de ceux qui comportent disposés suivant un axe optique :

  • un réflecteur, de préférence de type elliptique, à paroi concave creuse avec, dans sa concavité, au moins une source lumineuse placée au voisinage d'un premier foyer du réflecteur ;
  • une lentille convergente placée en avant du réflecteur et admettant un foyer situé au voisinage du deuxième foyer du réflecteur ;
  • une surface réfléchissante, ou plieuse, située entre le réflecteur et la lentille, cette surface réfléchissante étant disposée de manière à être, au moins en partie, sensiblement horizontale lorsque le projecteur est en place sur le véhicule, ladite surface étant limitée par un bord d'extrémité, ou bord de coupure, situé au voisinage du foyer de la lentille.
The invention relates to a lighting module for a motor vehicle headlamp adapted to produce at least one cut-off light beam, a module of the kind comprising those arranged along an optical axis:
  • a reflector, preferably of elliptical type, concave hollow wall with concavity, at least one light source placed in the vicinity of a first focus of the reflector;
  • a convergent lens placed in front of the reflector and admitting a focus located in the vicinity of the second focus of the reflector;
  • a reflective surface, or bender, located between the reflector and the lens, this reflective surface being arranged to be at least partly substantially horizontal when the headlamp is in place on the vehicle, said surface being bounded by an edge of end, or cutting edge, located in the vicinity of the focus of the lens.

Un module d'éclairage de ce type est connu, par exemple d'après EP 1 357 334. Il permet d'obtenir un faisceau d'éclairage à coupure, notamment un faisceau de type code ou antibrouillard, sans utiliser un cache qui fait perdre une partie du flux lumineux de la source.A lighting module of this type is known, for example according to EP 1 357 334. It makes it possible to obtain a cut-off lighting beam, in particular a code or fog-type beam, without using a cache which makes it lose a part of the luminous flux of the source.

Selon EP 1 357 334, plusieurs réalisations sont envisagées. Dans celles qui comportent un réflecteur de préférence de type elliptique à paroi concave creuse, la plieuse est solidaire du réflecteur et son bord avant constitue le bord de coupure. Le positionnement de ce bord de coupure par rapport à la lentille doit être assuré avec précision afin d'éviter un chromatisme, un flou et/ou un positionnement de coupure aléatoire. La précision du positionnement rend difficile la conception et la réalisation des moyens d'assemblage du réflecteur et de la lentille. Cette précision demande à être améliorée, en particulier du point de vue constance d'un module à l'autre.According to EP 1 357 334, several embodiments are envisaged. In those which comprise a reflector preferably elliptical type concave hollow wall, the folder is integral with the reflector and its front edge is the cutting edge. The positioning of this cutting edge with respect to the lens must be ensured with precision in order to avoid a chromatism, a blur and / or a random cut position. The positioning accuracy makes it difficult to design and build the assembly means of the reflector and the lens. This precision needs to be improved, particularly from the point of view of constancy from one module to another.

Un premier but de l'invention est d'assurer de manière économique le respect des tolérances de positionnement de la plieuse par rapport à la lentille, afin d'éviter le chromatisme et les inconvénients rappelés ci-dessus.A first object of the invention is to economically ensure compliance with the positioning tolerances of the folder relative to the lens, to avoid the chromaticism and disadvantages mentioned above.

Selon un autre mode de réalisation illustré sur Fig. 4 de EP 1 357 334, il est prévu de réaliser le système optique du module d'éclairage en une seule pièce optique pleine, en matériau transparent. Dans ce cas, le réflecteur n'est plus du type à paroi concave creuse et l'installation de la source lumineuse est relativement délicate, notamment pour éviter des réfractions parasites. Un revêtement de matériau réfléchissant doit être prévu sur la surface externe de la partie elliptique servant de réflecteur, et est exposé aux dégradations. La surface plane de la plieuse doit, elle aussi, être munie d'un revêtement réfléchissant. La réalisation en une seule pièce massive du réflecteur et de la lentille complique le moulage et l'application ultérieure du revêtement réfléchissant. L'invention vise également à éviter de tels inconvénients.According to another embodiment illustrated in FIG. 4 of EP 1 357 334, it is intended to realize the optical system of the lighting module in one solid optical part, in transparent material. In this case, the reflector is no longer hollow concave wall type and the installation of the light source is relatively delicate, especially to avoid stray refractions. A coating of reflective material should be provided on the outer surface of the elliptical reflector portion, and is exposed to degradations. The flat surface of the folder must also be provided with a reflective coating. The realization in one piece massive reflector and lens complicates the molding and subsequent application of the reflective coating. The invention also aims to avoid such drawbacks.

Il est en outre souhaitable d'augmenter le rendement du module en flux lumineux. L'invention vise aussi à réduire les pertes de flux introduites par la plieuse, et à améliorer l'ouverture utile du collecteur qui est limitée par l'ouverture de la lentille.It is further desirable to increase the efficiency of the module in luminous flux. The invention also aims to reduce the loss of flux introduced by the folder, and to improve the useful opening of the collector which is limited by the opening of the lens.

Selon l'invention, un module d'éclairage pour projecteur de véhicule automobile propre à produire au moins un faisceau lumineux à coupure, du genre défini précédemment, est caractérisé en ce que :

  • la plieuse est solidaire par son bord avant de la lentille, s'étend vers l'arrière de la lentille et son bord arrière forme le bord de coupure,
  • le réflecteur présente une concavité tournée vers le haut et est situé, au moins en majeure partie, plus bas que la plieuse, la source lumineuse éclairant essentiellement vers le bas dans la concavité du réflecteur.
According to the invention, a lighting module for a motor vehicle headlamp adapted to produce at least one cut-off light beam, of the kind defined above, is characterized in that:
  • the folder is secured by its front edge of the lens, extends towards the rear of the lens and its rear edge forms the cutting edge,
  • the reflector has a concavity turned upwards and is located, at least for the most part, lower than the folder, the light source illuminating essentially downward in the concavity of the reflector.

La position du bord de coupure par rapport à la lentille est assurée de manière précise. L'application d'un revêtement réfléchissant sur le réflecteur peut être effectuée sur la face intérieure de la paroi concave.The position of the cutting edge with respect to the lens is precisely assured. The application of a reflective coating on the reflector can be performed on the inner face of the concave wall.

La lentille peut comporter une partie haute, située au-dessus de la plieuse, différente de la partie basse. La partie haute peut être formée par une lentille plan convexe ou biconvexe.The lens may comprise an upper part, located above the folder, different from the lower part. The upper part may be formed by a convex or biconvex plane lens.

Cette partie haute est avantageusement stigmatique entre un point dans l'air, situé sur le bord de coupure, et l'infini, ou est éventuellement optimisée vis-à-vis de la netteté de coupure ; cette partie haute peut être focalisée sur le centre du bord de coupure.This upper part is advantageously stigmatic between a point in the air, located on the cutting edge, and the infinite, or is optionally optimized vis-à-vis the cutting sharpness; this upper part can be focused on the center of the cutting edge.

La partie basse peut avoir pour sortie une surface stigmatique entre un point dans la matière confondu avec le centre du bord de coupure, et l'infini.The lower part may have for output a stigmatic surface between a point in the material confounded with the center of the cutting edge, and the infinite.

La base de la partie haute de la lentille présente, au niveau de la plieuse, une largeur supérieure à celle de la partie basse.The base of the upper part of the lens has, at the level of the folder, a width greater than that of the lower part.

Avantageusement, un bloc de matière transparente est solidaire de la partie basse de la lentille et s'étend vers l'arrière, ce bloc présentant une surface supérieure horizontale, au moins en partie, qui travaille en réflexion totale et constitue la plieuse, pour des rayons lumineux ayant pénétré dans le bloc. De préférence, la face d'extrémité arrière du bloc est verticale et perpendiculaire à l'axe optique.Advantageously, a block of transparent material is secured to the lower part of the lens and extends rearward, this block having a horizontal upper surface, at least in part, which works in total reflection and constitutes the folder, for light rays having entered the block. Preferably, the rear end face of the block is vertical and perpendicular to the optical axis.

Le bloc a sensiblement une forme en tronc de pyramide couché et sa largeur suivant une direction orthogonale à l'axe optique augmente d'arrière en avant.The block has substantially a truncated pyramid shape and its width in a direction orthogonal to the optical axis increases from back to front.

Selon une autre possibilité, une plaque de matière transparente est solidaire de la face arrière de la lentille et s'étend vers l'arrière, cette plaque présentant une face inférieure horizontale munie d'un revêtement réfléchissant qui constitue la plieuse.According to another possibility, a plate of transparent material is secured to the rear face of the lens and extends rearwardly, this plate presenting a horizontal lower face provided with a reflective coating which constitutes the folder.

Le bloc de matière transparente ou la plaque de matière transparente sont moulés d'une seule pièce avec la partie haute et la partie basse de la lentille, et sont avantageusement réalisés en PMMA (polyméthyl méthacrylate).The block of transparent material or the plate of transparent material are molded in one piece with the upper part and the lower part of the lens, and are advantageously made of PMMA (polymethyl methacrylate).

Le module d'éclairage peut comporter un deuxième réflecteur, notamment de type elliptique, à paroi concave creuse situé du côté de la plieuse opposé au premier réflecteur et tournant sa concavité vers le premier réflecteur, ce deuxième réflecteur comportant une source lumineuse complémentaire située au voisinage de son premier foyer, le deuxième foyer du deuxième réflecteur étant situé au voisinage du bord de coupure, cette deuxième source lumineuse et ce deuxième réflecteur donnant, en combinaison avec la lentille, un faisceau d'éclairage situé au-dessus de la ligne de coupure de sorte que la réunion des deux faisceaux permet d'obtenir un faisceau route ou diurne DRL.The lighting module may comprise a second reflector, in particular of elliptical type, hollow concave wall located on the side of the folder opposite the first reflector and turning its concavity towards the first reflector, this second reflector comprising a complementary light source located in the vicinity its first focus, the second focus of the second reflector being located in the vicinity of the cutoff edge, the second light source and the second reflector providing, in combination with the lens, a lighting beam located above the cutoff line so that the meeting of the two beams makes it possible to obtain a road or diurnal beam DRL.

De préférence, l'axe optique du deuxième réflecteur est incliné de haut en bas, d'arrière en avant sur le plan de la plieuse, notamment selon un angle d'environ 20°. La plieuse peut comporter un revêtement réfléchissant intervenant pour des rayons issus du deuxième réflecteur.Preferably, the optical axis of the second reflector is inclined from top to bottom, from back to front on the plane of the folder, in particular at an angle of about 20 °. The folder may comprise a reflective coating intervening for rays coming from the second reflector.

L'invention concerne aussi tout projecteur comprenant au moins un module d'éclairage comme précédemment décrit.The invention also relates to any projector comprising at least one lighting module as previously described.

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 référence aux dessins annexés, mais qui ne sont nullement limitatifs.The invention consists, apart from the arrangements described above, in a certain number of other arrangements which will be more explicitly discussed hereinafter with regard to exemplary embodiments described with reference to the appended drawings, but which are not in no way limiting.

Sur ces dessins :

  • Fig. 1 est une coupe verticale schématique d'un module d'éclairage selon l'invention.
  • Fig. 2 est une vue schématique en perspective, retournée d'environ 180° par rapport à Fig. 1, du module d'éclairage selon l'invention.
  • Fig. 3 est une vue schématique en coupe verticale, semblable à Fig. 1 du module d'éclairage avec un réflecteur complémentaire pour donner un faisceau route.
  • Fig. 4 est une coupe verticale schématique d'une variante de réalisation du module d'éclairage selon l'invention.
  • Fig. 5 est un réseau de courbes isolux obtenu avec le module d'éclairage des Fig. 1, 2 et 4 et avec la seule partie basse de Fig. 3, et
  • Fig. 6 est un réseau de courbes isolux, situé au-dessus de la ligne de coupure, obtenu avec le seul réflecteur haut, et sa source lumineuse associée, de la réalisation de Fig. 3.
On these drawings:
  • Fig. 1 is a schematic vertical section of a lighting module according to the invention.
  • Fig. 2 is a schematic perspective view, turned approximately 180 ° with respect to FIG. 1, the lighting module according to the invention.
  • Fig. 3 is a schematic view in vertical section, similar to FIG. 1 of the lighting module with a complementary reflector to give a road beam.
  • Fig. 4 is a schematic vertical section of an alternative embodiment of the lighting module according to the invention.
  • Fig. 5 is an isolux curve network obtained with the lighting module of FIGS. 1, 2 and 4 and with the only lower part of FIG. 3, and
  • Fig. 6 is a network of isolux curves, located above the cutoff line, obtained with only the top reflector, and its associated light source, the realization of FIG. 3.

Dans tout le texte, aussi bien de la description que des revendications, les termes « avant » et « arrière » sont à comprendre selon le sens de propagation des rayons du faisceau lumineux. En outre, les positions relatives, notamment exprimées par les adjectifs : haut, bas, horizontal, sont à comprendre pour un module dans sa position sur le véhicule, qui correspond à celle représentée sur les dessins.Throughout the text, both of the description and of the claims, the terms "front" and "back" are to be understood according to the direction of propagation of the rays of the light beam. In addition, the relative positions, in particular expressed by the adjectives: high, low, horizontal, are to be understood for a module in its position on the vehicle, which corresponds to that shown in the drawings.

En se reportant à Fig. 1 et 2, on peut voir un module d'éclairage E pour projecteur de véhicule automobile propre à produire au moins un faisceau lumineux à coupure. Un tel faisceau éclaire au-dessous d'une ligne de coupure qui peut être horizontale dans le cas d'un antibrouillard ou en forme de ligne brisée avec une branche horizontale et une branche inclinée montante dans le cas d'un faisceau code.Referring to Fig. 1 and 2, one can see a lighting module E for a motor vehicle headlamp clean to produce at least one light beam cutoff. Such a beam illuminates below a cutoff line which may be horizontal in the case of a fog or broken line shape with a horizontal branch and a rising inclined branch in the case of a code beam.

Le module E comporte, suivant un axe optique Y-Y horizontal et parallèle à l'axe longitudinal du véhicule, un réflecteur 1 de type elliptique à paroi 2 concave creuse tournant sa concavité vers le haut.The module E comprises, along a horizontal Y-Y optical axis and parallel to the longitudinal axis of the vehicle, a reflector 1 of elliptical type hollow concave wall 2 concave wall concavity upwards.

Le réflecteur 1 est limité en partie haute par une courbe 3 située dans un plan horizontal, passant de préférence par l'axe optique Y-Y. Le réflecteur 1 a une forme que l'on peut assimiler à une portion d'ellipsoïde déformée afin de maîtriser la répartition horizontale du faisceau lumineux. Il se présente comme une coque avec une ouverture 4 vers l'avant. Le réflecteur 1 comporte un premier foyer F1 intérieur et un deuxième foyer F2 situé en avant de l'ouverture 4 plane.The reflector 1 is limited at the top by a curve 3 located in a horizontal plane, preferably passing through the optical axis Y-Y. The reflector 1 has a shape that can be likened to a portion of deformed ellipsoid in order to control the horizontal distribution of the light beam. It is like a hull with an opening 4 forward. The reflector 1 comprises a first internal focus F1 and a second focus F2 located in front of the flat opening 4.

Le réflecteur 1 est avantageusement réalisé en matière plastique, avec un revêtement réfléchissant déposé sur la surface interne de la paroi 2.The reflector 1 is advantageously made of plastic, with a reflective coating deposited on the inner surface of the wall 2.

Une source lumineuse 5, avantageusement formée par une diode électroluminescente, est disposée au voisinage du premier foyer F1 et éclaire essentiellement vers le bas dans la concavité du réflecteur 1.A light source 5, advantageously formed by a light-emitting diode, is arranged in the vicinity of the first focus F1 and lights essentially downward in the concavity of the reflector 1.

Une lentille convergente L est placée en avant du réflecteur. Des moyens d'assemblage de la lentille L avec le réflecteur sont prévus, mais non représentés. La lentille L comporte une partie haute Lh et une partie basse Lb différentes, mais solidaires et injectables en une pièce unique en matière transparente, notamment en PMMA.A convergent lens L is placed in front of the reflector. Means for assembling the lens L with the reflector are provided, but not shown. The lens L comprises an upper part Lh and a lower part Lb different, but integral and injectable in a single piece of transparent material, especially PMMA.

La partie haute Lh, selon l'exemple de réalisation des Fig. 1 et 2 est une lentille plan convexe, dont la face plane est tournée vers l'arrière. En variante, cette partie haute Lh pourrait être formée par une lentille biconvexe.The upper part Lh, according to the embodiment of FIGS. 1 and 2 is a convex plane lens, whose flat face is turned towards the rear. Alternatively, this upper part Lh could be formed by a biconvex lens.

La partie basse Lb est solidaire d'un bloc 6 de matière transparente qui s'étend vers l'arrière et qui est d'une seule pièce avec les parties Lb et Lh. Le bloc 6 présente une face supérieure 7 horizontale solidaire, suivant son bord avant, de la lentille L et qui s'étend vers l'arrière. Le bord arrière 8 est situé au voisinage du second foyer F2 du réflecteur 1. En outre, le foyer F3 de la lentille L est également situé au voisinage du foyer F2 ou confondu avec.The lower part Lb is secured to a block 6 of transparent material which extends rearwardly and which is in one piece with the parts Lb and Lh. The block 6 has a horizontal upper surface 7 secured to the front edge of the lens L and extending rearwardly. The rear edge 8 is located in the vicinity of the second focus F2 of the reflector 1. In addition, the focus F3 of the lens L is also located in the vicinity of the focus F2 or confused with.

La partie haute Lh de la lentille est stigmatique entre le point F3 situé dans l'air, et l'infini. Le point F3 est au milieu du bord arrière 8 de la surface 7. La projection du bord 8 définit la coupure.The upper part Lh of the lens is stigmatic between the point F3 located in the air, and the infinite. The point F3 is in the middle of the rear edge 8 of the surface 7. The projection of the edge 8 defines the cut.

La face arrière 9 du bloc 7 est verticale. Cette face 9 peut être située dans un plan orthogonal à l'axe optique Y-Y comme illustré sur Fig. 1 et 2, auquel cas le bord de coupure 8 est un segment rectiligne. En variante, le bord 8 peut être formé par un arc de courbe épousant la courbure de champ de la lentille, auquel cas la face 9 est une portion de surface cylindrique à génératrices verticales dont la courbe directrice correspond au bord 8.The rear face 9 of the block 7 is vertical. This face 9 may be located in a plane orthogonal to the optical axis Y-Y as illustrated in FIG. 1 and 2, in which case the cutoff edge 8 is a rectilinear segment. Alternatively, the edge 8 may be formed by a curve arc matching the field curvature of the lens, in which case the face 9 is a cylindrical surface portion with vertical generatrices whose directional curve corresponds to the edge 8.

La face horizontale 7 travaille en réflexion totale sur des rayons lumineux tels que ib1 (Fig. 1) ayant pénétré dans le bloc 6, en provenance du réflecteur 2. La réflexion est ainsi obtenue sans qu'il soit nécessaire de déposer un revêtement réfléchissant sur la surface 7. Le rendement en flux avec la réflexion totale est supérieur à celui obtenu avec un revêtement réfléchissant.The horizontal face 7 works in total reflection on light rays such as ib 1 (FIG 1) having entered the block 6, from the reflector 2. The reflection is thus obtained without the need to deposit a reflective coating on the surface 7. The flux efficiency with the total reflection is higher than that obtained with a reflective coating.

Comme visible sur Fig. 2, le bloc 7 présente une largeur B, c'est-à-dire une dimension suivant une direction orthogonale au plan vertical passant par l'axe optique, qui augmente de l'arrière vers l'avant.As shown in Fig. 2, the block 7 has a width B, that is to say a dimension in a direction orthogonal to the vertical plane passing through the optical axis, which increases from the rear to the front.

La partie supérieure du bloc 6 a sensiblement la forme d'un tronc de pyramide couché, à base rectangulaire, dont la dimension verticale augmente du bord de coupure 8 vers la lentille. La base du bloc 6 opposée à la face arrière 9 correspond à la jonction avec la partie basse Lb. La largeur de Lb est inférieure à celle de la partie haute Lh dont la base déborde de part et d'autre de Lb par des zones A1, A2.The upper part of the block 6 has substantially the shape of a truncated pyramid trunk, rectangular base, the vertical dimension increases from the cut edge 8 to the lens. The base of the block 6 opposite the rear face 9 corresponds to the junction with the lower part Lb. The width of Lb is less than that of the upper part Lh whose base overflows on either side of Lb by zones A1, A2.

La partie basse Lb a pour sortie une surface 10 stigmatique entre le foyer F4 situé dans la matière du bloc 7, confondu géométriquement avec le centre du bord arrière 8, et l'infini. La partie Lb s'étend au-dessous du bloc 6 et rejoint progressivement le bord inférieur arrière de la paroi 9 selon une face 11 qui monte d'avant en arrière.The lower part Lb has a stigmatic surface 10 output between the focus F4 located in the material of the block 7, geometrically confused with the center of the rear edge 8, and the infinite. The portion Lb extends below the block 6 and gradually joins the lower rear edge of the wall 9 along a face 11 which rises from front to back.

L'ensemble des parties Lb, Lh, du bloc 6 et de la partie située au-dessous de ce bloc, ne forme qu'une seule pièce obtenue de moulage en matière transparente, notamment en PMMA ou en verre optique.All the parts Lb, Lh, block 6 and the portion below this block, forms a single piece obtained molding transparent material, including PMMA or optical glass.

Le fonctionnement du module d'éclairage est expliqué avec référence à Fig. 1.The operation of the lighting module is explained with reference to FIG. 1.

On considère tout d'abord un rayon lumineux i passant par le foyer F1 du réflecteur 2. Le rayon réfléchi ir passe par le foyer F2 du réflecteur 2 confondu avec le foyer F3 de la partie haute Lh de la lentille L. Le rayon ie sortant de la lentille Lh est parallèle à l'axe optique Y-Y, c'est-à-dire horizontal, au niveau de la ligne de coupure.We first consider a light ray i passing through the focus F1 of the reflector 2. The reflected ray ir passes through the focal point F2 of the reflector 2 coincides with the focus F3 of the upper part Lh of the lens L. The ray ie outgoing of the lens Lh is parallel to the optical axis YY, that is to say horizontal, at the cutoff line.

Un rayon i2 provenant d'un point situé en avant du foyer F1 est réfléchi par le réflecteur 2 selon un rayon ir2 qui passe en arrière du foyer F2 et coupe le plan focal de la lentille Lh au-dessus du foyer F3. Le rayon émergent correspondant à ie2 est un rayon descendant, au-dessous de la ligne de coupure, et ne provoque pas d'éblouissement.A radius i2 coming from a point situated in front of the focus F1 is reflected by the reflector 2 along a radius ir2 which passes behind the focus F2 and intersects the focal plane of the lens Lh above the focus F3. The emergent ray corresponding to ie2 is a descending ray, below the cutoff line, and does not cause glare.

Un rayon i1 provenant d'un point situé en arrière du foyer F1 est réfléchi en ir1 et tombe sur la face 9 arrière du bloc 6 au-dessous du foyer F3. En l'absence du bloc 6, ce rayon ir1 aurait continué sa course jusqu'à la face arrière de la partie haute Lh de la lentille et le rayon émergent aurait été ascendant, ce qui n'est pas acceptable.A radius i1 coming from a point located behind the focus F1 is reflected in ir1 and falls on the rear face 9 of the block 6 below the focus F3. In the absence of block 6, this ray ir1 would have continued its course to the rear face of the upper part Lh of the lens and the emerging ray would have been ascending, which is not acceptable.

Du fait de la présence du bloc 6, le rayon ir1 est réfracté selon ib1 qui est moins incliné sur l'horizontale car l'indice de réfraction du bloc 6 est supérieur à celui de l'air. Le rayon ib1 subit, contre la face 7 constituant la plieuse, une réflexion totale pour donner le rayon ic1 descendant dans la matière de la partie basse Lb. Le rayon ie1 qui émerge de la partie basse Lb est également descendant, au-dessous du bord de coupure. Ainsi, le rayon ir1 qui, en l'absence de la plieuse formée par la face 7 serait indésirable, est maintenu dans le faisceau à coupure et contribue à augmenter le flux de ce faisceau.Due to the presence of the block 6, the ir1 radius is refracted according to ib1 which is less inclined to the horizontal because the refractive index of the block 6 is greater than that of the air. The radius ib1 undergoes, against the face 7 constituting the folder, a total reflection to give the ic1 descending in the material of the lower part Lb. The radius ie1 which emerges from the lower part Lb is also descending, below the cutoff edge. Thus, the ray ir1 which, in the absence of the folder formed by the face 7 would be undesirable, is maintained in the cut-off beam and contributes to increasing the flow of this beam.

L'amélioration de rendement du module d'éclairage selon l'invention découle de deux effets :

  • le coefficient de réflexion, par réflexion interne, sur la plieuse 7 est excellent ;
  • la déviation des rayons provenant du réflecteur 2 sur la face 9 augmente, à diamètre de lentille Lh donné, l'angle utile du faisceau issu du réflecteur 2.
The efficiency improvement of the lighting module according to the invention stems from two effects:
  • the coefficient of reflection, by internal reflection, on the folder 7 is excellent;
  • the deviation of the rays coming from the reflector 2 on the face 9 increases, with a given lens diameter Lh, the useful angle of the beam coming from the reflector 2.

Dans un exemple de réalisation, un rendement optique de 73 % a été obtenu avec un module selon Fig. 1 et 2, contre 63 % pour un module creux de l'état de la technique ayant des dimensions semblables.In an exemplary embodiment, an optical efficiency of 73% was obtained with a module according to FIG. 1 and 2, against 63% for a hollow module of the state of the art having similar dimensions.

Il convient de noter que la réflexion sur la plieuse 7 est totale quel que soit l'angle d'incidence des rayons ir, ir1, ir2 sur la face 9 car l'indice de réfraction de la matière du bloc 6, PMMA ou verre optique, est supérieur à √2, condition pour que la réflexion sur 7 soit totale quel que soit l'angle d'incidence sur la face 9.It should be noted that the reflection on the folder 7 is total regardless of the angle of incidence of the rays ir, ir1, ir2 on the face 9 because the refractive index of the material of the block 6, PMMA or optical glass , is greater than √2, so that the reflection on 7 is total regardless of the angle of incidence on the face 9.

Fig. 5 est un schéma illustrant le réseau de courbes isolux (à éclairement constant) obtenu avec un module d'éclairage selon Fig. 1 et 2 sur un écran placé à distance déterminée, généralement 25 m, du module. Les graduations de l'échelle horizontale définissent les orientations, dans le plan horizontal, des rayons lumineux par rapport à l'axe optique, tandis que les graduations de l'échelle verticale correspondent aux inclinaisons, dans le plan vertical, des rayons lumineux. L'éclairement maximum correspond à la courbe intérieure. Les courbes successives, dont les dimensions augmentent, correspondent à des éclairements moins importants. D'après Fig. 5 il apparaît que la zone éclairée est située au-dessous d'une ligne horizontale de coupure C qui correspond à l'image du bord rectiligne 8 de la face 9.Fig. 5 is a diagram illustrating the network of isolux curves (at constant illumination) obtained with a lighting module according to FIG. 1 and 2 on a screen placed at a determined distance, generally 25 m, from the module. The graduations of the horizontal scale define the orientations, in the horizontal plane, of the light rays with respect to the optical axis, while the graduations of the vertical scale correspond to the inclinations, in the vertical plane, of the light rays. The illumination maximum corresponds to the inner curve. The successive curves, whose dimensions increase, correspond to smaller illuminations. From Fig. 5 it appears that the illuminated area is located below a horizontal cut line C which corresponds to the image of the rectilinear edge 8 of the face 9.

On pourrait obtenir une ligne de coupure en forme d'angle, par exemple avec une partie horizontale située à gauche de l'axe vertical et une partie montante située à droite en prévoyant une surface de plieuse 7 et un bord 8 adaptés à la ligne de coupure souhaitée.An angle-shaped cut line could be obtained, for example with a horizontal portion to the left of the vertical axis and a rising portion to the right by providing a folder surface 7 and an edge 8 adapted to the line of contact. desired cut.

Fig. 3 montre une variante de réalisation dans laquelle on retrouve les différents éléments du module d'éclairage de Fig. 1 et 2 avec un deuxième réflecteur 12 de type elliptique à paroi concave creuse situé au-dessus du plan horizontal de la plieuse 7. La concavité du réflecteur 12 est tournée vers le bas. Une deuxième source lumineuse 13, avantageusement une diode électroluminescente, éclairant vers le haut est disposée à un premier foyer intérieur F5 du réflecteur 12. Le deuxième foyer F6 du réflecteur 12 est confondu avec le foyer F4 de la partie basse Lb de la lentille, et est situé au milieu du bord arrière 8. L'axe optique Y2-Y2 du réflecteur 12 est incliné sur l'horizontale d'un angle α, notamment de l'ordre d'une vingtaine de degrés, et s'écarte de l'horizontale d'avant en arrière. Il est ainsi possible de dégager un espace entre les réflecteurs pour loger les boîtiers des diodes constituant les sources 5 et 13 et l'épaisseur de leur circuit support.Fig. 3 shows an alternative embodiment in which we find the different elements of the lighting module of FIG. 1 and 2 with a second reflector 12 of elliptical type concave hollow wall located above the horizontal plane of the folder 7. The concavity of the reflector 12 is turned downwards. A second light source 13, advantageously an up-lighting electroluminescent diode, is arranged at a first internal focus F5 of the reflector 12. The second focus F6 of the reflector 12 coincides with the focus F4 of the lower part Lb of the lens, and is located in the middle of the rear edge 8. The optical axis Y2-Y2 of the reflector 12 is inclined to the horizontal angle α, in particular of the order of twenty degrees, and deviates from the horizontal from front to back. It is thus possible to clear a space between the reflectors for housing the housings of the diodes constituting the sources 5 and 13 and the thickness of their support circuit.

Un rayon i3 provenant du foyer F5 est réfléchi suivant ir3 par le réflecteur 12 et passe par le foyer F6 confondu avec le foyer F4 de la partie Lb de lentille. Le rayon émergent ie3 est parallèle à l'axe optique Y-Y.A ray i3 from the focus F5 is reflected along ir3 by the reflector 12 and passes through the focus F6 coincides with the focus F4 of the lens portion Lb. The emerging ray ie3 is parallel to the optical axis Y-Y.

Un rayon i4 provenant d'un point situé en avant du foyer F5 est réfléchi suivant le rayon ir4 qui passe au-dessous du foyer F6 et rencontre la face arrière 9 du bloc 6. Ce rayon est réfracté en ib4 et émerge de la partie Lb de lentille sous forme du rayon ascendant ie4.A ray i4 coming from a point situated in front of the focus F5 is reflected along the radius ir4 which passes below the focus F6 and meets the rear face 9 of the block 6. This ray is refracted at ib4 and emerges from the part Lb of lens in the form of ascending radius ie4.

Un rayon i5 provenant d'un point situé en arrière du foyer F5 est réfléchi suivant ir5 qui passe au-dessus du foyer F6 et tombe sur la plieuse 7. Une fraction de ce rayon ir5 est réfléchie en ib5 qui tombe sur la face arrière de la partie haute Lh de la lentille. Le rayon émergent ie5 est ascendant. L'autre partie du rayon ir5 est réfractée et pénètre à l'intérieur du bloc 6 pour émerger en ip5 qui est perdu.A ray i5 from a point located behind the F5 focus is reflected along ir5 which passes over the focus F6 and falls on the bender 7. A fraction of this ray ir5 is reflected in ib5 which falls on the back side of the upper part Lh of the lens. The emerging ray ie5 is ascending. The other part of the radius ir5 is refracted and penetrates inside the block 6 to emerge in ip5 which is lost.

Il apparaît ainsi que les rayons émergents ie4, ie5 provenant de la deuxième source 13 et du deuxième réflecteur 12 sont ascendants et permettent de créer un faisceau complémentaire situé au-dessus de la ligne de coupure, ce faisceau constituant une partie d'un faisceau route ou DRL (éclairage diurne).It thus appears that the emerging rays ie4, ie5 coming from the second source 13 and the second reflector 12 are ascending and make it possible to create a complementary beam located above the cutoff line, this beam constituting part of a road beam or DRL (daytime running light).

Fig.6 est un schéma des courbes isolux obtenues avec la seule source 13 et le second réflecteur 12. On voit que l'éclairement se situe essentiellement au-dessus de la ligne de coupure C.FIG. 6 is a diagram of the isolux curves obtained with the single source 13 and the second reflector 12. It can be seen that the illumination is essentially above of the cutoff line C.

Lorsque les deux sources 5 et 13 sont allumées, la réunion des faisceaux des Fig. 5 et 6 donne un faisceau route ou un faisceau diurne DRL.When the two sources 5 and 13 are on, the beams of Figs. 5 and 6 gives a road beam or diurnal beam DRL.

Il est à noter qu'un revêtement réfléchissant peut être prévu sur la face 7 dans la réalisation de Fig. 3 pour améliorer le rendement de la partie supérieure du faisceau lumineux provenant de la source 13 et du réflecteur 12.It should be noted that a reflective coating may be provided on the face 7 in the embodiment of FIG. 3 to improve the efficiency of the upper portion of the light beam from the source 13 and the reflector 12.

Fig. 4 illustre une variante de réalisation selon laquelle une plaque de matière transparente 14 est solidaire de la face arrière de la lentille La et s'étend vers l'arrière. La plaque 14 présente une face inférieure 7a horizontale, au moins en partie, munie d'un revêtement réfléchissant obtenu par exemple par métallisation, notamment par dépôt d'une couche d'aluminium.Fig. 4 illustrates an alternative embodiment in which a plate of transparent material 14 is secured to the rear face of the lens La and extends rearwardly. The plate 14 has a horizontal bottom face 7a, at least partially, provided with a reflective coating obtained for example by metallization, in particular by deposition of an aluminum layer.

La plaque 14 est moulée d'une seule pièce avec la lentille La, de type biconvexe selon Fig.4. La plaque 14 en section verticale a sensiblement la forme d'un dièdre, sa face supérieure plane s'écartant de la face inférieure 7a de l'arrière vers l'avant. Vue de dessus, la plaque 14 présente un contour sensiblement rectangulaire limité, vers l'arrière, par un bord 8a constituant le bord de coupure, notamment rectiligne comme sur Fig. 2.The plate 14 is molded in one piece with the La lens, biconvex type according to Fig.4. The plate 14 in vertical section has substantially the shape of a dihedron, its upper planar face deviating from the lower face 7a from the rear to the front. Viewed from above, the plate 14 has a substantially rectangular outline limited, towards the rear, by an edge 8a constituting the cutting edge, in particular rectilinear as in FIG. 2.

La source lumineuse 5a est située dans le prolongement de la face supérieure inclinée 15. Le deuxième foyer du réflecteur 2a est situé sur le bord 8a.The light source 5a is located in the extension of the inclined upper face 15. The second focus of the reflector 2a is located on the edge 8a.

Le fonctionnement du module de Fig.4 est semblable à celui décrit à propos des Fig. 1 et 2, et est illustré par trois rayons lumineux issus de la source 5a. En sortie de la lentille La, les rayons sont tous descendants ou parallèles à l'axe optique de la lentille La. La zone 16 de raccordement entre la lame 14 et la lentille La constitue une zone morte, de dimensions réduites, qui ne participe pas au faisceau lumineux.The operation of the module of FIG. 4 is similar to that described with reference to FIGS. 1 and 2, and is illustrated by three light rays from the source 5a. At the output of the lens La, the rays are all falling or parallel to the optical axis of the lens La. The zone 16 of connection between the blade 14 and the lens La constitutes a dead zone, of reduced dimensions, which does not participate. to the light beam.

La solution de Fig. 4 permet une lentille La moins épaisse que dans les modes de réalisation précédents.The solution of FIG. 4 allows a lens The less thick than in the previous embodiments.

Quelle que soit la réalisation envisagée, l'invention permet une bonne précision de positionnement de la plieuse et du bord de coupure 8, 8a par rapport à la lentille. Le rendement optique est amélioré. Les dépôts de revêtement réfléchissant sont supprimés ou réduits. Il est possible (Fig. 3) de prévoir un faisceau complémentaire au-dessus de la coupure par simple ajout d'une diode 13 et d'un réflecteur 12.Whatever the embodiment envisaged, the invention allows good positioning accuracy of the folder and the cutting edge 8, 8a with respect to the lens. The optical efficiency is improved. Reflective coating deposits are removed or reduced. It is possible (Fig. 3) to provide a complementary beam above the cut by simply adding a diode 13 and a reflector 12.

Claims (15)

Module d'éclairage pour projecteur de véhicule automobile propre à produire au moins un faisceau lumineux à coupure, comportant disposés suivant un axe optique : - un réflecteur (1), de préférence de type elliptique, à paroi (2) concave creuse avec, dans sa concavité, au moins une source lumineuse (5) placée au voisinage d'un premier foyer (F1) du réflecteur ; - une lentille convergente (L) placée en avant du réflecteur et admettant un foyer (F3) situé au voisinage du deuxième foyer (F2) du réflecteur ; - une surface réfléchissante, ou plieuse, située entre le réflecteur et la lentille, cette plieuse étant disposée de manière à être, au moins en partie, sensiblement horizontale, ladite plieuse étant limitée par un bord d'extrémité (8), ou bord de coupure, situé au voisinage du foyer (F3) de la lentille, caractérisé en ce que : - la plieuse (7) est solidaire par son bord avant de la lentille (L), s'étend vers l'arrière de la lentille et son bord arrière forme le bord de coupure (8), - le réflecteur (1) présente une concavité tournée vers le haut et est situé, au moins en majeure partie, plus bas que la plieuse, la source lumineuse (5) éclairant essentiellement vers le bas dans la concavité du réflecteur. Lighting module for a motor vehicle headlamp adapted to produce at least one cut-off light beam, comprising arranged along an optical axis: a reflector (1), preferably of elliptical type, with hollow concave wall (2) with, in its concavity, at least one light source (5) placed in the vicinity of a first focus (F1) of the reflector; - A convergent lens (L) placed in front of the reflector and admitting a focus (F3) located in the vicinity of the second focus (F2) of the reflector; a reflective or folding surface situated between the reflector and the lens, this folder being arranged so as to be at least partly substantially horizontal, said folder being limited by an end edge (8) or edge of cutoff, located in the vicinity of the focus (F3) of the lens, characterized in that - The folder (7) is secured by its front edge of the lens (L), extends towards the rear of the lens and its rear edge forms the cutting edge (8), - The reflector (1) has a concavity facing upwards and is located, at least for the most part, lower than the folder, the light source (5) illuminating essentially downward in the concavity of the reflector. Module d'éclairage selon la revendication 1, caractérisé en ce que la lentille (L) comporte une partie haute (Lh), située au-dessus de la plieuse, différente de la partie basse (Lb).Lighting module according to claim 1, characterized in that the lens (L) comprises an upper part (Lh) situated above the folder, different from the lower part (Lb). Module d'éclairage selon la revendication 2, caractérisé en ce qu'un bloc (6) de matière transparente est solidaire de la partie basse (Lb) de la lentille et s'étend vers l'arrière, ce bloc présentant une surface supérieure (7) horizontale, au moins en partie, qui travaille en réflexion totale et constitue la plieuse pour des rayons lumineux ayant pénétré dans le bloc.Lighting module according to claim 2, characterized in that a block (6) of transparent material is integral with the lower part (Lb) of the lens and extends rearwards, this block having an upper surface ( 7) horizontal, at least in part, which works in total reflection and is the folder for light rays having entered the block. Module d'éclairage selon la revendication 2 ou 3, caractérisé en ce que la partie haute (Lh) de la lentille est formée par une lentille plan convexe ou biconvexe.Lighting module according to claim 2 or 3, characterized in that the upper part (Lh) of the lens is formed by a convex or biconvex flat lens. Module d'éclairage selon l'une des revendications 2 à 4, caractérisé en ce que la partie basse (Lb) de la lentille a pour sortie une surface stigmatique entre un point (F4) dans la matière confondu avec le centre du bord de coupure (8), et l'infini.Lighting module according to one of claims 2 to 4, characterized in that the lower part (Lb) of the lens has a stigmatic surface output between a point (F4) in the material coincides with the center of the cutting edge (8), and infinity. Module d'éclairage selon l'une des revendications 2 à 5, caractérisé en ce que la base de la partie haute (Lh) de la lentille présente, au niveau de la plieuse, une largeur supérieure à celle de la partie basse (Lb).Lighting module according to one of Claims 2 to 5, characterized in that the base of the upper part (Lh) of the lens present, at the level of the folder, a width greater than that of the lower part (Lb). Module d'éclairage selon la revendication 3, caractérisé en ce que la face d'extrémité arrière (9) du bloc est verticale et perpendiculaire à l'axe optique.Lighting module according to claim 3, characterized in that the rear end face (9) of the block is vertical and perpendicular to the optical axis. Module d'éclairage selon la revendication 3 ou 7, caractérisé en ce que le bloc (6) a sensiblement une forme en tronc de pyramide couché et sa largeur (B) suivant une direction orthogonale à l'axe optique augmente d'arrière en avant.Lighting module according to claim 3 or 7, characterized in that the block (6) has substantially a truncated pyramid shape and its width (B) in a direction orthogonal to the optical axis increases from back to front . Module d'éclairage selon la revendication 1, caractérisé en ce qu' une plaque (14) de matière transparente est solidaire de la face arrière de la lentille (La) et s'étend vers l'arrière, cette plaque présentant une face inférieure horizontale (7a) munie d'un revêtement réfléchissant qui constitue la plieuse.Lighting module according to claim 1, characterized in that a plate (14) of transparent material is integral with the rear face of the lens (La) and extends rearwardly, this plate having a horizontal lower face (7a) provided with a reflective coating which constitutes the folder. Module d'éclairage selon la revendication 3 ou 9, caractérisé en ce que le bloc (6) ou la plaque (14) sont moulés d'une seule pièce avec la lentille (L,La).Lighting module according to claim 3 or 9, characterized in that the block (6) or the plate (14) are molded in one piece with the lens (L, La). Module d'éclairage selon la revendication 10, caractérisé en ce que le bloc (6), ou la plaque (14), et la lentille sont réalisés en PMMA.Lighting module according to claim 10, characterized in that the block (6), or the plate (14), and the lens are made of PMMA. Module d'éclairage selon l'une des revendications précédentes, caractérisé en ce qu'il comporte un deuxième réflecteur (12), notamment de type elliptique, à paroi concave creuse situé du côté de la plieuse (7) opposé au premier réflecteur (1), et tournant sa concavité vers le premier réflecteur, ce deuxième réflecteur (12) comportant une source lumineuse complémentaire (13) située au voisinage de son premier foyer (F5), le deuxième foyer (F6) du deuxième réflecteur étant situé au voisinage du bord de coupure (8), cette deuxième source lumineuse et ce deuxième réflecteur donnant, en combinaison avec la lentille, un faisceau d'éclairage situé au-dessus de la ligne de coupure de sorte que la réunion des deux faisceaux permet d'obtenir un faisceau route ou diurne DRL.Lighting module according to one of the preceding claims, characterized in that it comprises a second reflector (12), in particular of elliptical type, concave hollow wall located on the side of the folder (7) opposite the first reflector (1 ), and turning its concavity towards the first reflector, this second reflector (12) having a complementary light source (13) located in the vicinity of its first focus (F5), the second focus (F6) of the second reflector being located in the vicinity of cutting edge (8), this second light source and this second reflector giving, in combination with the lens, a lighting beam located above the cutoff line so that the meeting of the two beams makes it possible to obtain a road or daytime beam DRL. Module d'éclairage selon la revendication 12, caractérisé en ce que l'axe optique (Y2-Y2) du deuxième réflecteur (12) est incliné de haut en bas, d'arrière en avant sur le plan de la plieuse (7).Lighting module according to claim 12, characterized in that the optical axis (Y2-Y2) of the second reflector (12) is inclined from top to bottom, from rear to front on the plane of the folder (7). Module d'éclairage selon la revendication 12 ou 13, caractérisé en ce la plieuse (7) comporte un revêtement réfléchissant intervenant pour des rayons issus du deuxième réflecteur (12).Lighting module according to claim 12 or 13, characterized in that the folder (7) comprises a reflective coating intervening for rays coming from the second reflector (12). Projecteur comportant au moins un module d'éclairage selon l'une des revendications précédentes.Projector comprising at least one lighting module according to one of the preceding claims.
EP05292454A 2004-12-06 2005-11-18 Lighting module for vehicle headlamp Not-in-force EP1666787B1 (en)

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FR0412963A FR2878938B1 (en) 2004-12-06 2004-12-06 LIGHTING MODULE FOR MOTOR VEHICLE PROJECTOR

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AT (1) ATE373199T1 (en)
DE (1) DE602005002442T2 (en)
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Also Published As

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JP2006164980A (en) 2006-06-22
DE602005002442T2 (en) 2008-06-12
ATE373199T1 (en) 2007-09-15
JP4976686B2 (en) 2012-07-18
SI1666787T1 (en) 2008-02-29
FR2878938B1 (en) 2007-01-19
FR2878938A1 (en) 2006-06-09
EP1666787B1 (en) 2007-09-12
DE602005002442D1 (en) 2007-10-25

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