EP3232118B1 - Headlight module for motor vehicle - Google Patents

Headlight module for motor vehicle Download PDF

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Publication number
EP3232118B1
EP3232118B1 EP17165098.9A EP17165098A EP3232118B1 EP 3232118 B1 EP3232118 B1 EP 3232118B1 EP 17165098 A EP17165098 A EP 17165098A EP 3232118 B1 EP3232118 B1 EP 3232118B1
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EP
European Patent Office
Prior art keywords
collector
collectors
focal region
light
module
Prior art date
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Application number
EP17165098.9A
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German (de)
French (fr)
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EP3232118A1 (en
Inventor
Simon Gousset-Rousseau
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Valeo Vision SAS
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Valeo Vision SAS
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated 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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/147—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
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources

Definitions

  • the present invention relates to a device for emitting a light beam.
  • a preferred application relates to the automotive industry for the production of lighting devices, in particular motor vehicle headlamps.
  • lighting modules are known, among which there are traditionally dipped headlights, or dipped headlights, with a range on the road of around 70 meters, which are used essentially at night and whose configuration of the light beam is such that it makes it possible not to dazzle the driver of a vehicle crossed or followed.
  • this beam has a cut in the upper part with a horizontal portion, preferably approximately 0.57 degrees below the horizon, so as not to illuminate the area in which the driver of an oncoming vehicle should be located. .
  • the publications FR2934667 And FR2860280 fall within the scope of this technology by forming a lighting module which produces a cut-off beam by means of a bender arranged along the optical axis between first and second optical collectors suitable for collecting light emitted by first and second light sources respectively and redirecting the light to a focal region where one of the ends of the bender is located. Downstream of the bender, the rays are projected via a projection lens located at the output of the lighting module.
  • This prior art has a relatively complex structure, in particular due to a large number of parts to be assembled to form the projector. Furthermore, the bender placed between the two collectors has the effect of generating a dark line in the light beam, when the first and second light sources are switched on for “full headlights” lighting (main beam).
  • the invention makes it possible to solve all or part of the drawbacks of current techniques and proposes, to this end, to implement the cut-off function by exploiting the phenomenon of reflection, preferably total, on one of the collectors, so as to get rid of the folder.
  • the term "collector adapted to reflect a light ray by total reflection” means a collector made of a material with a refractive index such as a light ray, arriving on a wall of the collector with an angle d incidence greater than a predetermined value, is totally reflected on this wall, without a part of the energy of this ray being substantially transmitted through this wall.
  • the invention relates, in this sense, to a transmission module according to claim 1.
  • one of said at least one first and/or at least one second collector is advantageously used as an optical reflector to generate a beam with a cut-off profile, without requiring any additional component, such as a plate metallic fixed between said first and second collectors.
  • Said collector acting as a cut-off element makes it possible to reflect all or part of the rays coming from the other collector(s), towards an upper/lower end of the lens, possibly provided for projecting the beam.
  • the reflection can be achieved either by vitreous reflection on a dioptric surface defined between the collector and the ambient medium, or by metallic reflection on a metallic coating deposited on part of the surface of the collector.
  • the outer surface of one collector with respect to the other plays the role of optical reflector.
  • Another aspect of the invention relates to a transmission device comprising at least one transmission module according to one or more of the characteristics described above.
  • the device is a motor vehicle front headlight.
  • FIG. 1 is a sectional representation of a lighting module 1 for a motor vehicle, according to one embodiment of the invention.
  • the cut is made along a vertical plane [O, X, Z] of a local coordinate system ⁇ O, X, Y, Z ⁇ , where the OX axis indicates a horizontal direction, parallel to the optical axis of the projector, while the OZ axis designates a vertical direction perpendicular to the OX axis.
  • the light module shown in figure 1 is intended to produce two light beams for the implementation of two distinct lighting modes: (i) lighting having a cut-off profile to avoid dazzling vehicles traveling in the opposite direction (corresponding to a lighting mode of type “codes”), and (ii) lighting without cut-off profile (corresponding to a lighting mode of the “full headlights” or “main beam” type).
  • the lighting module (or emission module) according to the invention 1 comprises a first assembly consisting of a first light source 3 and a first optical collector 5, the first optical assembly being intended to provide a first light beam .
  • the module 1 further comprises a second assembly consisting of a second light source 4 and a second optical collector 6, the second optical assembly being intended to provide a second light beam.
  • a converging lens 10 is arranged along the optical axis A, so as to project the optical beams coming from the collectors and to produce one of the two lighting modes provided depending on the switching on of one or more two light sources 3, 4.
  • the first collector 5 extends in the direction of a focal region to reflect part of the light emitted by the other collector, so as to define the cut-off profile.
  • the focal region corresponds to focus F of lens 10.
  • the first collector 5 comprises a surface 55 for reflecting the light coming from the second collector 6. More precisely, the cut-off profile of the beam is produced by a surface element 55 of the first collector 5 at the level of the focus F, this surface element forming an interface between the first manifold 5 and the ambient medium consisting of air.
  • the cutoff is implemented by an external partial reflection of the vitreous reflection type.
  • a the beam can be cut off advantageously without requiring any additional component, such as a so -called folding metal plate.
  • the cuts produced can have any orientation in space.
  • the cut-off profile preferably means the formation of an output beam, not uniformly distributed around the optical axis, due to the presence of a zone of less light exposure, this zone being substantially delimited by a profile cutoff, which can be formed by at least two, and in particular three straight line segments forming an angle between them to form a bend, known by the English term "kink".
  • the resulting lighting is said to be of the "low beam" type.
  • each light source 3, 4 consists of a light-emitting diode.
  • several emission elements may be combined to form each of the first and second light sources, so as to emit a luminous flux of higher optical power at the output of the projection lens.
  • Each emission element may consist, for example, of a light-emitting diode or a laser diode.
  • the first 3 and second 4 light sources are oriented so as to emit light in directions parallel to the optical axis A of the module.
  • the first 5 and second 6 collectors are adapted to collect the light emitted by the first 3 and second 4 light sources respectively and to redirect the light collected towards the focal region and in particular towards the focal point F.
  • the first collector 5 extending in the direction of the focal region comprises a collection region 51 having an axis of symmetry inclined in the direction of the optical axis A of the module.
  • the first and second collectors are separated by a medium with a refractive index lower than the index refraction of collectors.
  • this medium consists of air.
  • a dioptric surface 55 is thus formed between the air and the first collector 5. In this way, all or part of the rays coming from the second collector 6 are reflected on the surface of the first collector 5, for example, according to a glassy reflection.
  • the first collector 5 extending in the direction of the focal region has an exit face 53 comprised in the focal region and more particularly in a vertical plane (F, O, Y) comprising the point focal F.
  • the dioptric surface 55 of the first collector 5 is tangent to the optical axis A of the module.
  • the first and second collectors are made of a transparent material having a refractive index greater than the refractive index of air.
  • Polycarbonate (PC) suitable for resisting the heat generated by the diodes (LED) will preferably be used.
  • PC Polycarbonate
  • LED diodes
  • the choice of this material is particularly advantageous, insofar as the LED diodes are close to the transparent collectors.
  • the collectors may be made of polypropylene carbonate (PPC) or polymethyl methacrylate (PMMA).
  • FIG 2 shows in section, along a vertical plane (O, X, Z) passing through the optical axis A, a second embodiment of the invention.
  • This second embodiment differs from the first embodiment described with reference to the figure 1 , in that the second collector 6' extends along the optical axis A in the direction of the focal region.
  • the second collector 6' extending in the direction of the focal region, comprises a collection region 61 having an axis of symmetry inclined in the direction of the optical axis A of the module.
  • a dioptric surface 65 is formed between the ambient medium consisting of air and the second collector 6', allowing all or part of the rays coming from the first collector 5' to be reflected on the surface of the second collector 6' by an external partial reflection of the vitreous reflection type.
  • the cutoff profile of the beam is produced by an element of the diopter surface 65 at the level of the focal point F, as previously described with reference to the figure 1 .
  • the module is adapted so that part of the light coming from the first light source 3 associated with the first collector 5' is transmitted by said first collector 5' and passes through the second collector 6' , so as to come out through the exit face 63 comprised in the focal region.
  • the second collector 6' is adapted to guide the light injected from the first collector 5', as far as the exit surface 63 of the second collector 6', so as to reach the projection lens 10.
  • the lower surface 67 of the second collector 6' is shaped in such a way that the light coming from the first collector 5' undergoes total reflection on this surface. The light thus emitted can be used to illuminate road signs located above the roadway, in height.
  • the lower surface 67 of the second collector 6' is shaped to illuminate the road signs, whether in partial or total reflection, or by metallizing this surface.
  • FIG. 3 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, a variant embodiment applied to the first embodiment of the invention described above with reference to the figure 1 .
  • the first collector 5" extending towards the focal region, comprises a reflective coating 8 arranged on a part of the collector 5" in particular at the level of the focal region, so as to reflect all or part of the rays coming of the other collector 6 according to a cut-off profile.
  • this reflective coating 8 consists of a thin layer of metal, the layer being thin enough to avoid the appearance of a zone of absence of light, at the output of the projection lens 10.
  • This metal coating also makes it possible to improve the emission efficiency of the part of the module which does not extend to the focal region (ie second source 4 and second collector 6 in the example of the picture 3 ), due to a high reflectivity of the metal in comparison with the case of glassy reflection.
  • such a coating can be easily shaped according to the desired cut-off profile. It thus constitutes a cut-off element integrated into the first 5" collector of the module.
  • the metallic coating 8 partly covers the surface 55 of the first collector 5 tangent to the optical axis A, so that all or part of the rays coming from the second collector 6 are reflected on the metallic coating 8 (reflection external metallic reflection type), so as to be redirected towards a lower end of the lens 10.
  • FIG 4 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, the same embodiment variant applied to the second embodiment of the invention described above with reference to the figure 2 .
  • the metallic coating 8' partly covers the surface 65 of the second collector 6" tangent to the optical axis A, so that all or part of the rays coming from the first collector 5' are reflected on the layer metal 8', so as to be redirected towards an upper end of the lens 10.
  • the beam is cut off by means of a metallic reflection of the rays coming from the first collector 5' implemented by the metallic coating 8'.
  • FIG. 5 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, a third embodiment of the invention, in which the first 5 and second 6 'collectors extend in the direction of the focal region and in particular towards the focal point F of the lens 10.
  • the two collectors 5, 6' each have an output face 53, 63 included in the focal region, and in particular in a vertical plane (F, Y, Z) comprising the focal point F of lens 10.
  • the lower surface 55 of the first collector 5 and the upper surface 65 of the second collector 6' coincide along the optical axis A, so that the two collectors are in contact with each other to form a dioptric surface.
  • the cutoff is achieved by total reflection at the level of the dioptric surface.
  • This embodiment in which the first and second collectors are both extended up to the focal point F of the lens 10, advantageously makes it possible to maximize the optical flows originating from the first 5 and second 6′ collectors respectively, given that each of these flows undergo a total reflection at the level of the dioptric surface.
  • the two collectors are separated by a thin slice of air arranged along the optical axis A, so that each collector defines a diopter surface with air.
  • Each dioptric surface thus formed by a collector makes it possible to reflect all or part of the light emitted by the other collector. Thus, all or part of the rays coming from the two collectors are reflected towards the upper and lower ends of the lens 10.
  • the exit face of the collector(s) extending in the direction of the focal region has a flat surface perpendicular to the optical axis A. This is the exit face 53 of the first collector 5 , 5" as shown on the figure 1 , 3 , 5 and the outlet face 63 of the second collector 6', 6" as illustrated on the figure 2 , 4 , 5 .
  • this exit face may have a curved or hollow surface and/or may be inclined with respect to the optical axis, in order to widen or concentrate the optical beam and/or to correct any aberrations of the projection lens 10.
  • the edge formed by the intersection of the output surface of the transparent collector having been extended in the direction of the optical axis and the lower surface of this collector, forming the cut-off element, can be shaped so as to reduce the the effect of the aberrations of the projection lens 10 on the shape of the cut in the beam.
  • This is the edge of the first collector 5.5" between its outlet surface 53 and its lower surface 55 as illustrated in the figure 1 , 3 or the edge of the second manifold 6', 6" between its exit surface 63 and its lower surface 65 as illustrated in the figure 2 , 4 .
  • FIG 6 shows in perspective, a multi-source module according to the invention comprising several transmission modules according to the second embodiment previously described with reference to the figure 2 .
  • the module is said to be “multi-source” in the sense that it comprises several light sources to have sufficient optical power, in accordance with the lighting standards in force.
  • the module comprises a first row of seven light-emitting diodes 3a, 3b, 3c, 3d, 3e, 3f, 3g (first sources) and a second row of five light-emitting diodes 4c, 4d, 4e, 4f, 4g (second sources ). Seven first collectors and five second collectors are respectively associated with the seven first and five second light sources.
  • the second collectors are in continuity of material with each other, so as to form a single part 600, this part being able to be easily produced by molding or by any other suitable manufacturing technique.
  • the first collectors are in continuity of material with each other, so as to form a single piece.
  • the module further comprises a projection lens 100 common to all the sources and collectors.

Description

La présente invention est relative à un dispositif d'émission d'un faisceau lumineux. Une application préférée concerne l'industrie automobile pour la réalisation de dispositifs d'éclairage, notamment de projecteurs de véhicules automobiles.The present invention relates to a device for emitting a light beam. A preferred application relates to the automotive industry for the production of lighting devices, in particular motor vehicle headlamps.

Dans ce domaine, on connaît des modules d'éclairage parmi lesquels on trouve traditionnellement des feux de croisement, ou codes, d'une portée sur la route avoisinant 70 mètres, qui sont utilisés essentiellement la nuit et dont la configuration du faisceau lumineux est telle qu'elle permet de ne pas éblouir le conducteur d'un véhicule croisé ou suivi. Typiquement, ce faisceau présente une coupure en partie supérieure avec une portion horizontale, préférentiellement environ 0,57 degrés en dessous de l'horizon, afin de ne pas éclairer la zone dans laquelle devrait se trouver le conducteur d'un véhicule arrivant en sens inverse.In this field, lighting modules are known, among which there are traditionally dipped headlights, or dipped headlights, with a range on the road of around 70 meters, which are used essentially at night and whose configuration of the light beam is such that it makes it possible not to dazzle the driver of a vehicle crossed or followed. Typically, this beam has a cut in the upper part with a horizontal portion, preferably approximately 0.57 degrees below the horizon, so as not to illuminate the area in which the driver of an oncoming vehicle should be located. .

Les publications FR2934667 et FR2860280 s'inscrivent dans le cadre de cette technologie en formant un module d'éclairage qui réalise un faisceau à coupure au moyen d'une plieuse disposée le long de l'axe optique entre des premier et deuxième collecteurs optiques adaptés à collecter une lumière émise par des première et deuxième sources lumineuses respectivement et à rediriger la lumière vers une région focale où se situe une des extrémités de la plieuse. En aval de la plieuse, les rayons sont projetés via une lentille de projection située en sortie du module d'éclairage.The publications FR2934667 And FR2860280 fall within the scope of this technology by forming a lighting module which produces a cut-off beam by means of a bender arranged along the optical axis between first and second optical collectors suitable for collecting light emitted by first and second light sources respectively and redirecting the light to a focal region where one of the ends of the bender is located. Downstream of the bender, the rays are projected via a projection lens located at the output of the lighting module.

Cette antériorité a une structure relativement complexe notamment en raison d'un nombre élevé de pièces à assembler pour former le projecteur. Par ailleurs, la plieuse disposée entre les deux collecteurs a pour effet de générer une ligne sombre dans le faisceau de lumière, lorsque les première et deuxième sources de lumière sont allumées pour un éclairage « plein phares » (feux de route).This prior art has a relatively complex structure, in particular due to a large number of parts to be assembled to form the projector. Furthermore, the bender placed between the two collectors has the effect of generating a dark line in the light beam, when the first and second light sources are switched on for “full headlights” lighting (main beam).

L'invention permet de résoudre tout ou partie des inconvénients des techniques actuelles et propose, à cette fin, de mettre en oeuvre la fonction de coupure en exploitant le phénomène de réflexion, de préférence totale, sur l'un des collecteurs, de manière à s'affranchir de la plieuse. Dans la description qui va suivre, on entend par « collecteur adapté pour réfléchir un rayon lumineux par réflexion totale » un collecteur réalisé en un matériau d'indice de réfraction tel qu'un rayon lumineux, arrivant sur une paroi du collecteur avec un angle d'incidence supérieure à une valeur prédéterminée, est totalement réfléchi sur cette paroi, sans qu'une partie de l'énergie de ce rayon soit sensiblement transmise au travers de cette paroi.The invention makes it possible to solve all or part of the drawbacks of current techniques and proposes, to this end, to implement the cut-off function by exploiting the phenomenon of reflection, preferably total, on one of the collectors, so as to get rid of the folder. In the following description, the term "collector adapted to reflect a light ray by total reflection" means a collector made of a material with a refractive index such as a light ray, arriving on a wall of the collector with an angle d incidence greater than a predetermined value, is totally reflected on this wall, without a part of the energy of this ray being substantially transmitted through this wall.

L'invention concerne, en ce sens, un module d'émission selon la revendication 1.The invention relates, in this sense, to a transmission module according to claim 1.

Selon l'invention, l'un desdits au moins un premier et/ou au moins un deuxième collecteurs est avantageusement utilisé en tant que réflecteur optique pour générer un faisceau avec un profil de coupure, sans nécessiter de composant additionnel, tel qu'une plaque métallique fixée entre lesdits premier et deuxième collecteurs. Ledit collecteur jouant le rôle d'élément de coupure, permet de réfléchir tout ou une partie des rayons issus du ou des autres collecteur(s), vers une extrémité supérieure/inférieure de la lentille, éventuellement prévue pour projeter le faisceau.According to the invention, one of said at least one first and/or at least one second collector is advantageously used as an optical reflector to generate a beam with a cut-off profile, without requiring any additional component, such as a plate metallic fixed between said first and second collectors. Said collector acting as a cut-off element, makes it possible to reflect all or part of the rays coming from the other collector(s), towards an upper/lower end of the lens, possibly provided for projecting the beam.

Selon divers modes de réalisation envisagés, la réflexion peut être réalisée, soit par réflexion vitreuse sur une surface dioptrique définie entre le collecteur et le milieu ambient, soit par réflexion métallique sur un revêtement métallique déposé sur une partie de la surface du collecteur. Dans les deux cas, la surface externe d'un collecteur par rapport à l'autre, joue le rôle de réflecteur optique.According to various embodiments envisaged, the reflection can be achieved either by vitreous reflection on a dioptric surface defined between the collector and the ambient medium, or by metallic reflection on a metallic coating deposited on part of the surface of the collector. In both cases, the outer surface of one collector with respect to the other plays the role of optical reflector.

D'autres caractéristiques, optionnelles et non limitatives, sont énoncées ci-après. Elles pourront être mises en oeuvre séparément ou selon toutes combinaisons entre elles :

  • lesdits au moins un premier et au moins un deuxième collecteurs sont réalisés par des pièces distinctes l'une de l'autre,
  • le milieu est constitué d'air,
  • le(s) collecteur(s) s'étendant en direction de la région focale présente(nt) une face de sortie comprise dans ladite région focale,
  • ladite face de sortie comprise dans ladite région focale est convexe, concave, ou inclinée,
  • seulement l'un des collecteurs s'étend vers la région focale,
  • le collecteur s'étendant vers la région focale comprend un revêtement réfléchissant disposé sur une partie du collecteur et destiné à réfléchir tout ou partie des rayons issus de l'autre collecteur,
  • le revêtement est disposé au moins sur une partie de la surface du collecteur s'étendant à partir de la région focale, en direction des sources lumineuses,
  • lesdits au moins un premier et au moins un deuxième collecteurs s'étendent le long de l'axe optique en direction de la région focale,
  • le ou les collecteurs s'étendant en direction de la région focale comprennent une région de collecte présentant un axe de symétrie incliné en direction de l'axe optique du module,
  • le ou les collecteurs s'étendant en direction de la région focale comprennent une surface tangente à l'axe optique du module,
  • au moins un desdits au moins un premier et au moins un deuxième collecteurs comprend du polycarbonate,
  • l'indice de réfraction du premier et du deuxième collecteur est identique,
  • lesdites au moins une première et au moins une deuxième sources lumineuses sont orientées de manière à émettre de la lumière selon des directions sensiblement parallèles à l'axe optique du module,
  • au moins une des sources lumineuses est orientée de manière à émettre de la lumière en direction de l'axe optique, au moins l'une desdites au moins une première et au moins une deuxième sources lumineuses comprend une diode électroluminescente,
  • le module est adapté de sorte qu'une partie de la lumière traversant l'un des collecteurs en provenance de la ou des sources lumineuses associées traverse l'autre collecteur, de manière à ressortir par la face de sortie comprise dans la région focale,
  • le module comprend une pluralité de premiers collecteurs et/ou une pluralité de deuxièmes collecteurs,
  • ladite pluralité de premiers collecteurs sont en continuité de matière et/ou la pluralité de deuxièmes collecteurs sont en continuité de matière, les uns avec les autres, respectivement,
  • le module comprend en outre une lentille de projection qui pourra être configurée pour être commune à la pluralité de premiers collecteurs et/ou à la pluralité de deuxièmes collecteurs.
Other features, optional and non-limiting, are set out below. They may be implemented separately or in any combination between them:
  • said at least one first and at least one second collectors are made by separate parts from each other,
  • the medium consists of air,
  • the collector(s) extending in the direction of the focal region has (have) an exit face comprised in said focal region,
  • said exit face comprised in said focal region is convex, concave, or inclined,
  • only one of the collectors extends towards the focal region,
  • the collector extending towards the focal region comprises a reflective coating arranged on part of the collector and intended to reflect all or part of the rays coming from the other collector,
  • the coating is placed at least on part of the surface of the collector extending from the focal region, in the direction of the light sources,
  • said at least one first and at least one second collectors extend along the optical axis in the direction of the focal region,
  • the collector or collectors extending in the direction of the focal region comprise a collection region having an axis of symmetry inclined in the direction of the optical axis of the module,
  • the collector or collectors extending in the direction of the focal region comprise a surface tangent to the optical axis of the module,
  • at least one of said at least one first and at least one second manifold comprises polycarbonate,
  • the refractive index of the first and the second collector is identical,
  • said at least one first and at least one second light sources are oriented so as to emit light in directions substantially parallel to the optical axis of the module,
  • at least one of the light sources is oriented so as to emit light in the direction of the optical axis, at least one of said at least one first and at least one second light sources comprises a light-emitting diode,
  • the module is adapted so that part of the light passing through one of the collectors coming from the associated light source(s) passes through the other collector, so as to come out through the exit face included in the focal region,
  • the module comprises a plurality of first collectors and/or a plurality of second collectors,
  • said plurality of first collectors are in continuity of material and/or the plurality of second collectors are in continuity of material, with each other, respectively,
  • the module further comprises a projection lens which may be configured to be common to the plurality of first collectors and/or to the plurality of second collectors.

Un autre aspect de l'invention porte sur un dispositif d'émission comprenant au moins un module d'émission selon l'une ou plusieurs des caractéristiques décrites ci-avant. Selon une particularité de l'invention, le dispositif est un projecteur avant de véhicule automobile.Another aspect of the invention relates to a transmission device comprising at least one transmission module according to one or more of the characteristics described above. According to a feature of the invention, the device is a motor vehicle front headlight.

D'autres caractéristiques, buts et avantages de la présente invention apparaîtront à la lecture de la description détaillée qui suit, et en regard des dessins annexés donnés à titre d'exemples non limitatifs et sur lesquels :

  • la figure 1 montre en coupe, selon un plan vertical passant par l'axe optique, un premier mode de réalisation de l'invention ;
  • la figure 2 montre en coupe, selon un plan vertical passant par l'axe optique, un deuxième mode de réalisation de l'invention ;
  • la figure 3 montre en coupe, selon un plan vertical passant par l'axe optique, une variante du premier mode de réalisation de l'invention ;
  • la figure 4 montre en coupe, selon un plan vertical passant par l'axe optique, une variante du deuxième mode de réalisation de l'invention ;
  • la figure 5 montre en coupe, selon un plan vertical passant par l'axe optique, un troisième mode de réalisation de l'invention ; et
  • la figure 6 montre en perspective, un module d'éclairage multi-sources selon l'invention.
Other characteristics, objects and advantages of the present invention will appear on reading the detailed description which follows, and with regard to the appended drawings given by way of non-limiting examples and in which:
  • there figure 1 shows in section, along a vertical plane passing through the optical axis, a first embodiment of the invention;
  • there figure 2 shows in section, along a vertical plane passing through the optical axis, a second embodiment of the invention;
  • there picture 3 shows in section, along a vertical plane passing through the optical axis, a variant of the first embodiment of the invention;
  • there figure 4 shows in section, along a vertical plane passing through the optical axis, a variant of the second embodiment of the invention;
  • there figure 5 shows in section, along a vertical plane passing through the optical axis, a third embodiment of the invention; And
  • there figure 6 shows in perspective, a multi-source lighting module according to the invention.

La figure 1 est une représentation en coupe d'un module d'éclairage 1 pour véhicule automobile, selon un mode de réalisation de l'invention. Dans cette représentation, la coupe est réalisée suivant un plan vertical [O, X, Z] d'un repère local {O, X, Y, Z}, où l'axe O-X indique une direction horizontale, parallèle à l'axe optique du projecteur, tandis que l'axe O-Z désigne une direction verticale perpendiculaire à l'axe O-X.There figure 1 is a sectional representation of a lighting module 1 for a motor vehicle, according to one embodiment of the invention. In this representation, the cut is made along a vertical plane [O, X, Z] of a local coordinate system {O, X, Y, Z}, where the OX axis indicates a horizontal direction, parallel to the optical axis of the projector, while the OZ axis designates a vertical direction perpendicular to the OX axis.

Le module d'éclairage illustré à la figure 1 est destiné à produire deux faisceaux lumineux pour la mise en oeuvre de deux modes d'éclairage distincts : (i) un éclairage présentant un profil de coupure pour éviter d'éblouir les véhicules circulant en sens inverse (correspondant à un mode d'éclairage de type « codes »), et (ii) un éclairage sans profil de coupure (correspondant à un mode d'éclairage de type « plein phares » ou « feux de route »).The light module shown in figure 1 is intended to produce two light beams for the implementation of two distinct lighting modes: (i) lighting having a cut-off profile to avoid dazzling vehicles traveling in the opposite direction (corresponding to a lighting mode of type “codes”), and (ii) lighting without cut-off profile (corresponding to a lighting mode of the “full headlights” or “main beam” type).

Le module d'éclairage (ou module d'émission) selon l'invention 1 comprend un premier ensemble constitué d'une première source lumineuse 3 et d'un premier collecteur optique 5, le premier ensemble optique étant destiné à fournir un premier faisceau lumineux.The lighting module (or emission module) according to the invention 1 comprises a first assembly consisting of a first light source 3 and a first optical collector 5, the first optical assembly being intended to provide a first light beam .

Le module 1 selon l'invention comprend, en outre, un deuxième ensemble constitué d'une deuxième source lumineuse 4 et d'un deuxième collecteur optique 6, le deuxième ensemble optique étant destiné à fournir un deuxième faisceau lumineux.The module 1 according to the invention further comprises a second assembly consisting of a second light source 4 and a second optical collector 6, the second optical assembly being intended to provide a second light beam.

Une lentille convergente 10 est disposée le long de l'axe optique A, de manière à projeter les faisceaux optiques issus des collecteurs et à réaliser l'un des deux modes d'éclairage prévus en fonction de l'allumage de l'une ou des deux sources lumineuses 3, 4.A converging lens 10 is arranged along the optical axis A, so as to project the optical beams coming from the collectors and to produce one of the two lighting modes provided depending on the switching on of one or more two light sources 3, 4.

Selon l'invention, le premier collecteur 5 s'étend en direction d'une région focale pour réfléchir une partie de la lumière émise par l'autre collecteur, de façon à définir le profil de coupure. Dans le cas présent, la région focale correspond au foyer F de la lentille 10.According to the invention, the first collector 5 extends in the direction of a focal region to reflect part of the light emitted by the other collector, so as to define the cut-off profile. In the present case, the focal region corresponds to focus F of lens 10.

De manière avantageuse, le premier collecteur 5 comprend une surface de réflexion 55 de la lumière issue du deuxième collecteur 6. Plus précisément, le profil de coupure du faisceau est produit par un élément de surface 55 du premier collecteur 5 au niveau du foyer F, cet élément de surface formant un dioptre entre le premier collecteur 5 et le milieu ambiant constitué d'air. La coupure est mise en oeuvre par une réflexion partielle externe de type réflexion vitreuse. Ainsi, une coupure du faisceau peut être réalisée de manière avantageuse sans nécessiter de composant additionnel, tel qu'une plaque métallique dite plieuse (ou folder en anglais).Advantageously, the first collector 5 comprises a surface 55 for reflecting the light coming from the second collector 6. More precisely, the cut-off profile of the beam is produced by a surface element 55 of the first collector 5 at the level of the focus F, this surface element forming an interface between the first manifold 5 and the ambient medium consisting of air. The cutoff is implemented by an external partial reflection of the vitreous reflection type. Thus, a the beam can be cut off advantageously without requiring any additional component, such as a so -called folding metal plate.

Les coupures produites peuvent avoir toute orientation dans l'espace. Le profil de coupure s'entend préférentiellement de la formation d'un faisceau de sortie, non uniformément réparti autour de l'axe optique, du fait de la présence d'une zone de moindre exposition lumineuse, cette zone étant sensiblement délimitée par un profil de coupure, qui peut être formé par au moins deux, et notamment trois segments de droite formant un angle entre eux pour former un virage, connu sous le vocable anglais « kink ». L'éclairage résultant est dit de type « feux de codes ».The cuts produced can have any orientation in space. The cut-off profile preferably means the formation of an output beam, not uniformly distributed around the optical axis, due to the presence of a zone of less light exposure, this zone being substantially delimited by a profile cutoff, which can be formed by at least two, and in particular three straight line segments forming an angle between them to form a bend, known by the English term "kink". The resulting lighting is said to be of the "low beam" type.

Dans l'exemple présent, chaque source lumineuse 3, 4 est constituée d'une diode électroluminescente. Toutefois, dans d'autres modes de réalisation, plusieurs éléments d'émission pourront être combinés pour former chacune des première et deuxième sources lumineuses, de manière à émettre un flux lumineux de puissance optique plus élevée en sortie de la lentille de projection. Chaque élément d'émission pourra être constitué, par exemple, par une diode électroluminescente ou une diode laser.In the present example, each light source 3, 4 consists of a light-emitting diode. However, in other embodiments, several emission elements may be combined to form each of the first and second light sources, so as to emit a luminous flux of higher optical power at the output of the projection lens. Each emission element may consist, for example, of a light-emitting diode or a laser diode.

Selon une autre particularité de l'invention, les première 3 et deuxième 4 sources lumineuses sont orientées, de manière à émettre de la lumière selon des directions parallèles à l'axe optique A du module.According to another feature of the invention, the first 3 and second 4 light sources are oriented so as to emit light in directions parallel to the optical axis A of the module.

Les premier 5 et deuxième 6 collecteurs sont adaptés pour collecter la lumière émise par les première 3 et deuxième 4 sources lumineuses respectivement et pour rediriger la lumière collectée vers la région focale et en particulier vers le point focal F.The first 5 and second 6 collectors are adapted to collect the light emitted by the first 3 and second 4 light sources respectively and to redirect the light collected towards the focal region and in particular towards the focal point F.

Selon une particularité de l'invention, le premier collecteur 5 s'étendant en direction de la région focale comprend une région de collecte 51 présentant un axe de symétrie incliné en direction de l'axe optique A du module.According to a feature of the invention, the first collector 5 extending in the direction of the focal region comprises a collection region 51 having an axis of symmetry inclined in the direction of the optical axis A of the module.

Selon une autre particularité de l'invention, les premier et deuxième collecteurs sont séparés par un milieu d'indice de réfraction inférieur à l'indice de réfraction des collecteurs. Dans le présent exemple, ce milieu est constitué d'air.According to another feature of the invention, the first and second collectors are separated by a medium with a refractive index lower than the index refraction of collectors. In the present example, this medium consists of air.

Comme déjà indiqué, une surface dioptrique 55 est ainsi formée entre l'air et le premier collecteur 5. De la sorte, tout ou partie des rayons issus du deuxième collecteur 6 se réfléchissent à la surface du premier collecteur 5, par exemple, selon une réflexion vitreuse.As already indicated, a dioptric surface 55 is thus formed between the air and the first collector 5. In this way, all or part of the rays coming from the second collector 6 are reflected on the surface of the first collector 5, for example, according to a glassy reflection.

Selon une autre particularité de l'invention, le premier collecteur 5 s'étendant en direction de la région focale présente une face de sortie 53 comprise dans la région focale et plus particulièrement dans un plan vertical (F, O, Y) comprenant le point focal F. La surface dioptrique 55 du premier collecteur 5 est tangente à l'axe optique A du module.According to another feature of the invention, the first collector 5 extending in the direction of the focal region has an exit face 53 comprised in the focal region and more particularly in a vertical plane (F, O, Y) comprising the point focal F. The dioptric surface 55 of the first collector 5 is tangent to the optical axis A of the module.

Les premier et deuxième collecteurs sont constitués d'un matériau transparent ayant un indice de réfraction supérieur à l'indice de réfraction de l'air. On utilisera préférentiellement du polycarbonate (PC) adapté à résister à la chaleur générée par les diodes (LED). Le choix de ce matériau est particulièrement avantageux, dans la mesure où les diodes LED se trouvent à proximité des collecteurs transparents.The first and second collectors are made of a transparent material having a refractive index greater than the refractive index of air. Polycarbonate (PC) suitable for resisting the heat generated by the diodes (LED) will preferably be used. The choice of this material is particularly advantageous, insofar as the LED diodes are close to the transparent collectors.

Dans d'autres exemples de réalisation, les collecteurs pourront être constitués en carbonate de polypropylène (PPC) ou en polyméthacrylate de méthyle (PMMA) .In other embodiments, the collectors may be made of polypropylene carbonate (PPC) or polymethyl methacrylate (PMMA).

La figure 2 montre en coupe, selon un plan vertical (O, X, Z) passant par l'axe optique A, un deuxième mode de réalisation de l'invention. Ce deuxième mode de réalisation diffère du premier mode décrit en référence à la figure 1, en ce que le deuxième collecteur 6' s'étend le long de l'axe optique A en direction de la région focale.There figure 2 shows in section, along a vertical plane (O, X, Z) passing through the optical axis A, a second embodiment of the invention. This second embodiment differs from the first embodiment described with reference to the figure 1 , in that the second collector 6' extends along the optical axis A in the direction of the focal region.

Selon une particularité de l'invention, le deuxième collecteur 6' s'étendant en direction de la région focale, comprend une région de collecte 61 présentant un axe de symétrie incliné en direction de l'axe optique A du module.According to a feature of the invention, the second collector 6' extending in the direction of the focal region, comprises a collection region 61 having an axis of symmetry inclined in the direction of the optical axis A of the module.

Une surface dioptrique 65 est formée entre le milieu ambiant constitué d'air et le deuxième collecteur 6', permettant à tout ou partie des rayons issus du premier collecteur 5' de se réfléchir à la surface du deuxième collecteur 6' par une réflexion partielle externe de type réflexion vitreuse. Le profil de coupure du faisceau est produit par un élément de la surface dioptrique 65 au niveau du foyer F, comme décrit précédemment en référence à la figure 1. Selon une autre particularité de l'invention, le module est adapté de sorte qu'une partie de la lumière issue de la première source lumineuse 3 associée au premier collecteur 5' est transmise par ledit premier collecteur 5' et traverse le deuxième collecteur 6', de manière à ressortir par la face de sortie 63 comprise dans la région focale.A dioptric surface 65 is formed between the ambient medium consisting of air and the second collector 6', allowing all or part of the rays coming from the first collector 5' to be reflected on the surface of the second collector 6' by an external partial reflection of the vitreous reflection type. The cutoff profile of the beam is produced by an element of the diopter surface 65 at the level of the focal point F, as previously described with reference to the figure 1 . According to another feature of the invention, the module is adapted so that part of the light coming from the first light source 3 associated with the first collector 5' is transmitted by said first collector 5' and passes through the second collector 6' , so as to come out through the exit face 63 comprised in the focal region.

La première source lumineuse 3 et/ou le premier collecteur 5' sont adaptés, de sorte qu'une partie de la lumière issue de cette source traverse le premier collecteur 5' et pénètre dans le deuxième collecteur 6'. A cet effet, plusieurs adaptations peuvent être envisagées :

  1. a) la première source lumineuse 3 est légèrement inclinée en direction de l'axe optique A ; et/ou
  2. b) la première source lumineuse 3 émet selon un angle d'émission suffisamment large en direction du deuxième collecteur 6' ; et/ou
  3. c) la zone de collecte du premier collecteur 5' est conformée de sorte qu'une partie des rayons émis par la première source 3 ne soient pas réfléchis à la surface du premier collecteur 5', de manière à ce que ces rayons soient injectés dans le deuxième collecteur 6'.
The first light source 3 and/or the first collector 5' are adapted, so that part of the light coming from this source passes through the first collector 5' and enters the second collector 6'. To this end, several adaptations can be considered:
  1. a) the first light source 3 is slightly inclined in the direction of the optical axis A; and or
  2. b) the first light source 3 emits at a sufficiently wide emission angle in the direction of the second collector 6'; and or
  3. c) the collection zone of the first collector 5' is shaped so that part of the rays emitted by the first source 3 are not reflected at the surface of the first collector 5', so that these rays are injected into the second manifold 6'.

Le deuxième collecteur 6' est adapté pour guider la lumière injectée en provenance du premier collecteur 5', jusqu'à la surface de sortie 63 du deuxième collecteur 6', de manière à atteindre la lentille de projection 10. Pour cela, la surface inférieure 67 du deuxième collecteur 6' est conformée, de telle sorte que la lumière issue du premier collecteur 5' subisse une réflexion totale sur cette surface. La lumière ainsi émise pourra servir à éclairer des panneaux de signalisation situés au-dessus de la chaussée, en hauteur.The second collector 6' is adapted to guide the light injected from the first collector 5', as far as the exit surface 63 of the second collector 6', so as to reach the projection lens 10. For this, the lower surface 67 of the second collector 6' is shaped in such a way that the light coming from the first collector 5' undergoes total reflection on this surface. The light thus emitted can be used to illuminate road signs located above the roadway, in height.

La surface inférieure 67 du deuxième collecteur 6' est conformée pour éclairer les panneaux de signalisation, que ce soit en réflexion partielle ou totale, ou en métallisant cette surface.The lower surface 67 of the second collector 6' is shaped to illuminate the road signs, whether in partial or total reflection, or by metallizing this surface.

La figure 3 montre en coupe, selon un plan vertical (O, Y, Z) passant par l'axe optique A, une variante de réalisation appliquée au premier mode de réalisation de l'invention décrit précédemment en référence à la figure 1.There picture 3 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, a variant embodiment applied to the first embodiment of the invention described above with reference to the figure 1 .

Selon cette variante de réalisation, le premier collecteur 5" s'étendant vers la région focale, comprend un revêtement réfléchissant 8 disposé sur une partie du collecteur 5" notamment au niveau de la région focale, de manière à réfléchir tout ou partie des rayons issus de l'autre collecteur 6 selon un profil de coupure. A titre d'exemple illustratif et non limitatif, ce revêtement réfléchissant 8 est constitué par une fine couche de métal, la couche étant suffisamment fine pour éviter l'apparition d'une zone d'absence de lumière, en sortie de la lentille de projection 10. Ce revêtement métallique permet en outre d'améliorer l'efficacité d'émission de la partie du module qui ne s'étend pas jusqu'à la région focale (i.e. deuxième source 4 et deuxième collecteur 6 dans l'exemple de la figure 3), en raison d'un pouvoir de réflexion élevé du métal en comparaison avec le cas d'une réflexion vitreuse. En outre, un tel revêtement peut être facilement conformé selon le profil de coupure souhaité. Il constitue ainsi un élément de coupure intégré au premier collecteur 5" du module.According to this variant embodiment, the first collector 5" extending towards the focal region, comprises a reflective coating 8 arranged on a part of the collector 5" in particular at the level of the focal region, so as to reflect all or part of the rays coming of the other collector 6 according to a cut-off profile. By way of illustrative and non-limiting example, this reflective coating 8 consists of a thin layer of metal, the layer being thin enough to avoid the appearance of a zone of absence of light, at the output of the projection lens 10. This metal coating also makes it possible to improve the emission efficiency of the part of the module which does not extend to the focal region (ie second source 4 and second collector 6 in the example of the picture 3 ), due to a high reflectivity of the metal in comparison with the case of glassy reflection. Furthermore, such a coating can be easily shaped according to the desired cut-off profile. It thus constitutes a cut-off element integrated into the first 5" collector of the module.

Selon cette variante de réalisation, le revêtement métallique 8 recouvre en partie la surface 55 du premier collecteur 5 tangente à l'axe optique A, de sorte que tout ou partie des rayons issus du deuxième collecteur 6 se réfléchissent sur le revêtement métallique 8 (réflexion externe de type réflexion métallique), de manière à être redirigés vers une extrémité inférieure de la lentille 10.According to this variant embodiment, the metallic coating 8 partly covers the surface 55 of the first collector 5 tangent to the optical axis A, so that all or part of the rays coming from the second collector 6 are reflected on the metallic coating 8 (reflection external metallic reflection type), so as to be redirected towards a lower end of the lens 10.

La figure 4 montre en coupe, selon un plan vertical (O, Y, Z) passant par l'axe optique A, la même variante de réalisation appliquée au deuxième mode de réalisation de l'invention décrit précédemment en référence à la figure 2.There figure 4 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, the same embodiment variant applied to the second embodiment of the invention described above with reference to the figure 2 .

Selon cette même variante de réalisation, le revêtement métallique 8' recouvre en partie la surface 65 du deuxième collecteur 6" tangente à l'axe optique A, de sorte que tout ou partie des rayons issus du premier collecteur 5' se réfléchissent sur la couche métallique 8', de manière à être redirigés vers une extrémité supérieure de la lentille 10.According to this same variant embodiment, the metallic coating 8' partly covers the surface 65 of the second collector 6" tangent to the optical axis A, so that all or part of the rays coming from the first collector 5' are reflected on the layer metal 8', so as to be redirected towards an upper end of the lens 10.

Ainsi, la coupure du faisceau est réalisée au moyen d'une réflexion métallique des rayons issus du premier collecteur 5' mise en oeuvre par le revêtement métallique 8'.Thus, the beam is cut off by means of a metallic reflection of the rays coming from the first collector 5' implemented by the metallic coating 8'.

La figure 5 montre en coupe, selon un plan vertical (O, Y, Z) passant par l'axe optique A, un troisième mode de réalisation de l'invention, dans lequel les premier 5 et deuxième 6' collecteurs s'étendent en direction de la région focale et en particulier vers le point focal F de la lentille 10.There figure 5 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, a third embodiment of the invention, in which the first 5 and second 6 'collectors extend in the direction of the focal region and in particular towards the focal point F of the lens 10.

Selon une particularité de l'invention, les deux collecteurs 5, 6' présentent chacun une face de sortie 53, 63 comprise dans la région focale, et en particulier dans un plan vertical (F, Y, Z) comprenant le point focal F de la lentille 10.According to a feature of the invention, the two collectors 5, 6' each have an output face 53, 63 included in the focal region, and in particular in a vertical plane (F, Y, Z) comprising the focal point F of lens 10.

Comme illustré à la figure 5, la surface inférieure 55 du premier collecteur 5 et la surface supérieure 65 du deuxième collecteur 6' sont confondues suivant l'axe optique A, de sorte que les deux collecteurs soient en contact l'un avec l'autre pour former une surface dioptrique.As shown in figure 5 , the lower surface 55 of the first collector 5 and the upper surface 65 of the second collector 6' coincide along the optical axis A, so that the two collectors are in contact with each other to form a dioptric surface.

Ainsi, la coupure est réalisée par une réflexion totale au niveau de la surface dioptrique.Thus, the cutoff is achieved by total reflection at the level of the dioptric surface.

Ce mode de réalisation, dans lequel les premier et deuxième collecteurs sont tous deux étendus jusqu'au point focal F de la lentille 10, permet avantageusement de maximiser les flux optiques issus respectivement des premier 5 et deuxième 6' collecteurs, étant donné que chacun de ces flux subit une réflexion totale au niveau de la surface dioptrique.This embodiment, in which the first and second collectors are both extended up to the focal point F of the lens 10, advantageously makes it possible to maximize the optical flows originating from the first 5 and second 6′ collectors respectively, given that each of these flows undergo a total reflection at the level of the dioptric surface.

Selon l'invention, en particulier dans le cas où les deux collecteurs présentent un même indice de réfraction, les deux collecteurs sont séparés par une fine tranche d'air disposée le long de l'axe optique A, de sorte que chaque collecteur définisse une surface dioptrique avec l'air.According to the invention, in particular in the case where the two collectors have the same refractive index, the two collectors are separated by a thin slice of air arranged along the optical axis A, so that each collector defines a diopter surface with air.

Chaque surface dioptrique ainsi formée par un collecteur permet de réfléchir tout ou une partie de la lumière émise par l'autre collecteur. Ainsi, tout ou partie des rayons issus des deux collecteurs sont réfléchis vers des extrémités supérieure et inférieure de la lentille 10.Each dioptric surface thus formed by a collector makes it possible to reflect all or part of the light emitted by the other collector. Thus, all or part of the rays coming from the two collectors are reflected towards the upper and lower ends of the lens 10.

Dans les modes de réalisation décrits en référence aux figures 1 à 6, la face de sortie du (ou des) collecteur(s) s'étendant en direction de la région focale présente une surface plane et perpendiculaire à l'axe optique A. Il s'agit de la face de sortie 53 du premier collecteur 5, 5" telle qu'illustrée sur les figures 1, 3, 5 et de la face de sortie 63 du deuxième collecteur 6', 6" telle qu'illustrée sur les figures 2, 4, 5.In the embodiments described with reference to the figures 1 to 6 , the exit face of the collector(s) extending in the direction of the focal region has a flat surface perpendicular to the optical axis A. This is the exit face 53 of the first collector 5 , 5" as shown on the figure 1 , 3 , 5 and the outlet face 63 of the second collector 6', 6" as illustrated on the figure 2 , 4 , 5 .

Dans d'autres modes de réalisation de l'invention, cette face de sortie pourra présenter une surface bombée ou creusée et/ou pourra être inclinée par rapport à l'axe optique, afin d'élargir ou de concentrer le faisceau optique et/ou de corriger d'éventuelles aberrations de la lentille de projection 10.In other embodiments of the invention, this exit face may have a curved or hollow surface and/or may be inclined with respect to the optical axis, in order to widen or concentrate the optical beam and/or to correct any aberrations of the projection lens 10.

L'arrête formée par l'intersection de la surface de sortie du collecteur transparent ayant été étendue en direction de l'axe optique et de la surface inférieure de ce collecteur, formant l'élément de coupure, peut être conformée de manière à réduire l'effet des aberrations de la lentille de projection 10 sur la forme de la coupure dans le faisceau. Il s'agit de l'arrête du premier collecteur 5, 5"entre sa surface de sortie 53 et sa surface inférieure 55 comme illustrée sur les figures 1, 3 ou de l'arrête du deuxième collecteur 6', 6" entre sa surface de sortie 63 et sa surface inférieure 65 comme illustrée sur les figures 2, 4.The edge formed by the intersection of the output surface of the transparent collector having been extended in the direction of the optical axis and the lower surface of this collector, forming the cut-off element, can be shaped so as to reduce the the effect of the aberrations of the projection lens 10 on the shape of the cut in the beam. This is the edge of the first collector 5.5" between its outlet surface 53 and its lower surface 55 as illustrated in the figure 1 , 3 or the edge of the second manifold 6', 6" between its exit surface 63 and its lower surface 65 as illustrated in the figure 2 , 4 .

La figure 6 montre en perspective, un module multi-sources selon l'invention comprenant plusieurs modules d'émission selon le deuxième mode de réalisation précédemment décrit en référence à la figure 2.There figure 6 shows in perspective, a multi-source module according to the invention comprising several transmission modules according to the second embodiment previously described with reference to the figure 2 .

Le module est dit « multi-sources » dans le sens où il comprend plusieurs sources lumineuses pour disposer d'une puissance optique suffisante, conformément aux normes d'éclairage en vigueur. En particulier, le module comprend une première rangée de sept diodes électroluminescentes 3a, 3b , 3c, 3d, 3e, 3f, 3g (premières sources) et une deuxième rangée de cinq diodes électroluminescentes 4c, 4d, 4e, 4f, 4g (deuxièmes sources). Sept premiers collecteurs et cinq deuxièmes collecteurs sont associés respectivement aux sept premières et cinq deuxièmes sources lumineuses.The module is said to be “multi-source” in the sense that it comprises several light sources to have sufficient optical power, in accordance with the lighting standards in force. In particular, the module comprises a first row of seven light-emitting diodes 3a, 3b, 3c, 3d, 3e, 3f, 3g (first sources) and a second row of five light-emitting diodes 4c, 4d, 4e, 4f, 4g (second sources ). Seven first collectors and five second collectors are respectively associated with the seven first and five second light sources.

Selon une particularité de l'invention, les deuxièmes collecteurs sont en continuité de matière les uns avec les autres, de manière à former une seule pièce 600, cette pièce pouvant être facilement réalisée par moulage ou par toute autre technique de fabrication adaptée. Dans d'autres exemples de réalisation, les premiers collecteurs sont en continuité de matière les uns avec les autres, de manière à former une seule pièce.According to a feature of the invention, the second collectors are in continuity of material with each other, so as to form a single part 600, this part being able to be easily produced by molding or by any other suitable manufacturing technique. In other exemplary embodiments, the first collectors are in continuity of material with each other, so as to form a single piece.

Le module comprend en outre une lentille de projection 100 commune à l'ensemble des sources et des collecteurs.The module further comprises a projection lens 100 common to all the sources and collectors.

Claims (11)

  1. Module for a motor vehicle for emitting at least one light beam with a cut-off profile along an optical axis (A), said module comprising at least one first light source (3) and at least one second light source (4) and at least one first optical collector (5; 5'; 5") and at least one second optical collector (6; 6'; 6") that are designed to collect light emitted by said at least one first light source (3) and said at least one second light source (4) respectively and to redirect said light towards a focal region corresponding to the focus F of a lens (10), at least one of said collectors (5; 6'; 5''; 6") extending in the direction of said focal region in order to reflect by external reflection a part of the light emitted by the other collector (6; 5') so as to define said cut-off profile and serve as cut-off element, making it possible to reflect this part of the rays towards an upper/lower end of the lens (10) provided to project the beam, characterized in that the at least one first collector (5; 5'; 5") and the at least one second collector (6; 6'; 6") are separated by a medium having a refractive index lower than the refractive index of said collectors.
  2. Module according to Claim 1, in which said one or more collectors (5; 6'; 5''; 6") extending in the direction of the focal region have an exit face (53; 63) contained in said focal region.
  3. Module according to Claim 2, characterized in that it is designed such that a part of the light passing through one of the collectors (5') coming from the one or more associated light sources passes through the other collector (6'), so as to emerge via the exit face (63) contained in the focal region.
  4. Module according to any one of Claims 1 to 3, in which only one of the collectors (5; 6'; 5"; 6") extends towards the focal region.
  5. Module according to Claim 4, in which said collector (5", 6") extending towards the focal region comprises a reflective coating (8; 8') disposed on a part of said collector and intended to reflect all or some of the rays coming from the other collector (6; 5').
  6. Module according to Claim 5, in which said coating (8; 8') is disposed at least on a part of the surface of said collector (5", 6") extending from said focal region in the direction of said light sources (3; 4).
  7. Module according to either one of Claims 2 and 3, in which said at least one first collector (5) and said at least one second collector (6') extend along the optical axis (A) in the direction of said focal region.
  8. Module according to any one of Claims 1 to 7, in which said one or more collectors extending in the direction of the focal region comprise a surface (55; 65) tangential to the optical axis of the module.
  9. Module according to any one of Claims 1 to 8, in which said at least one first light source (3) and said at least one second light source (4) are oriented so as to emit light in directions substantially parallel to the optical axis (A) of the module.
  10. Emission module according to any one of Claims 1 to 9, comprising a plurality of first collectors (5a, 5b, 5c, 5d, 5e, 5f, 5g) and/or a plurality of second collectors (600), and in which said plurality of first collectors are in continuity of material and/or the plurality of second collectors (600) are in continuity of material with one another, respectively.
  11. Emission device comprising at least one emission module according to any one of Claims 1 to 10.
EP17165098.9A 2016-04-11 2017-04-05 Headlight module for motor vehicle Active EP3232118B1 (en)

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FR1653166A FR3050011A1 (en) 2016-04-11 2016-04-11 MODULE FOR TRANSMITTING A LUMINOUS BEAM FOR MOTOR VEHICLE PROJECTOR

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CN107289395A (en) 2017-10-24
EP3232118A1 (en) 2017-10-18
US20200263848A1 (en) 2020-08-20
JP2017199660A (en) 2017-11-02
JP6948818B2 (en) 2021-10-13
US20170292671A1 (en) 2017-10-12
US10663134B2 (en) 2020-05-26
FR3050011A1 (en) 2017-10-13
CN107289395B (en) 2021-10-15
US11085603B2 (en) 2021-08-10

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