EP1632710A2 - String shaped headlamp or signalling lamp comprising a stepped reflector - Google Patents

String shaped headlamp or signalling lamp comprising a stepped reflector Download PDF

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Publication number
EP1632710A2
EP1632710A2 EP05291597A EP05291597A EP1632710A2 EP 1632710 A2 EP1632710 A2 EP 1632710A2 EP 05291597 A EP05291597 A EP 05291597A EP 05291597 A EP05291597 A EP 05291597A EP 1632710 A2 EP1632710 A2 EP 1632710A2
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EP
European Patent Office
Prior art keywords
plane
light
light source
projector
screen
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
EP05291597A
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German (de)
French (fr)
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EP1632710A3 (en
EP1632710B1 (en
Inventor
Patrice Collot
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Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP1632710A2 publication Critical patent/EP1632710A2/en
Publication of EP1632710A3 publication Critical patent/EP1632710A3/en
Application granted granted Critical
Publication of EP1632710B1 publication Critical patent/EP1632710B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/40—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations

Definitions

  • the present invention relates to a searchlight or signaling of a motor vehicle, which is intended to provide a regulatory lighting or signaling beam directed generally forwardly along a longitudinal optical axis, comprising a light source, a first and a second reflector which is arranged laterally, with respect to the longitudinal direction, on either side of the light source, and which reflects the light rays emitted by the source generally longitudinally forwards, on the rear face of a light source; distribution screen which is arranged longitudinally vis-à-vis the reflectors so as to spread at least laterally the light rays to form the regulatory beam, of the type in which the distribution screen has generally the shape of a strip stretched in the direction of its length, at least one reflector being constituted by an echelon plane, the echelon plane comprises a series of substantially parallel return facets, a first optical element (38) being interposed in the path of the light rays emitted by the light source (16) between the light source (16) and the step plane (20), the first optical element (38) being
  • Such a projector is known for example from EP-A-0 299 091.
  • Vehicle manufacturers are particularly interested in this type of light because they integrate aesthetically and aerodynamically into the vehicle line.
  • Document EP-B-0,290,347 describes and represents an example of a so-called linear fire design having an almost homogeneous illuminating surface.
  • this fire design does not provide a sufficiently high luminous flux to perform certain regulatory functions, especially in the case of lights arranged in the front of the vehicle.
  • this fire design involves cutting-edge techniques for the production of parts constituting fire, including an exit screen having on its inner face teeth working in total reflection.
  • the present invention aims to overcome these disadvantages by providing a fire with improved light output.
  • the invention proposes a lighting or signaling projector of the type described above, in which the first optical element is a Fresnel element, and the first reflector is a step plane and the second reflector is a mirror overall. parabolic, the light source being arranged substantially in the focus of the dish.
  • FIG 1 there is shown schematically the front face of a motor vehicle 10 which is equipped with two traffic lights, respectively right 12 and left 14, made according to the teachings of the invention.
  • Each of these lights 12, 14 fills, for example, a direction indicator function and therefore carries a corresponding lighting regulatory beam, along a longitudinal optical axis X1 facing forward and substantially parallel to the longitudinal axis X0 of the vehicle 10.
  • FIG. 2 shows in detail the right signal light 12.
  • the orientation of the optical axis X1 from the rear to the front corresponds to an orientation of the left to the right, when one considers FIG. 2, the left side of the light 12 being at the top of the figure 2 and the right side at the bottom of Figure 2.
  • the light 12 comprises a light source 16 which is constituted here by the filament of a lamp 18.
  • the lamp 18 is inserted axially into a complementary housing 19 in an axial direction X3 which is contained in a horizontal plane and which is slightly inclined relative to a transverse direction.
  • the light 12 has a first 20 and a second 22 reflectors which are arranged laterally, with respect to the optical axis X1, on either side of the light source 16, respectively to the right and to the left of the latter 16.
  • the reflectors 20, 22 reflect the light rays emitted by the source 16 generally longitudinally forward, on the rear face 23 of a distribution screen 24 which is arranged longitudinally vis-à-vis the reflectors 20, 22.
  • the distribution screen 24 has the overall shape of a strip which extends in the direction of its length, generally following a generatrix-shaped arc, contained in a horizontal plane.
  • the width of the distribution screen 24 is therefore less than its length.
  • the distribution screen 24 has a left-hand lateral end 26 which is arranged on the side of the longitudinal axis X 0 of the vehicle 10, in front of the light 12, and a right-hand lateral end 28 which is arranged on the side of the right side of the vehicle 10 , longitudinally behind the left end 26.
  • the distribution screen 24 generally matches the rounded shape of the body portion of the vehicle 10 in which it is arranged. Consequently, the arc of a circle drawn by the distribution screen 24 tends to approach towards the rear in a longitudinal direction.
  • the first reflector 20 is constituted by a stepped plane.
  • the stepped plane 20 extends here in a substantially vertical plane which is inclined with respect to a transverse plane, the left lateral end 34 of the stepped plane 20 being offset longitudinally forwards relative to the right lateral end 36 .
  • the front face 30 of the echelon plane 20 comprises a series of vertically reflecting reflective facets 32 oriented globally forwards.
  • the step plane 20 is inclined with respect to a plane transverse to the optical axis from the rear of the light source 16 to form the left-hand lateral end 34 to the right-hand lateral end 36. back of the edge of the output screen 28.
  • a first Fresnel optical element said first lens 38, is interposed on the path of the light rays emitted by the source 16, between the source 16 and the front face 30 of the step plane 20.
  • the first lens 38 extends here in a substantially vertical plane, which generally describes an acute angle with the front face 30 of the echelon plane 20.
  • the refractive dioptric elements 42 which are arranged on the optical exit face 40 of the first lens 38, form concentric crowns or crown sectors here centered on a secondary optical axis X 2 passing through the light source 16 and passing through the front face 30 of the stepped plane 20.
  • the secondary optical axis X2 thus forms an incidental general direction which is directed towards the front face 30 of the step plane 20.
  • the light rays collected by the optical input face 44 of the first lens 38 are straightened along the secondary optical axis X2 so as to allow the reflection of these light rays on the facets 32 in longitudinal directions oriented towards the front.
  • the second reflector 22 is constituted by a generally parabolic mirror, the source 16 being arranged substantially at the focus of the dish.
  • the parabolic mirror 22 extends in its useful reflection surface from the right-hand lateral end 45, on the source side 16, to its left-hand lateral end 47 behind the end 26 of the exit screen in the direction of the optical axis.
  • a second Fresnel optical element, said second lens 46, is interposed between the source 16 and the rear face 23 of the distribution screen 24 so as to longitudinally straighten the light rays which are emitted by the source 16 directly to the screen 24, without being reflected by the reflectors 20, 22.
  • the second lens 46 is made similarly to the first lens 38. It extends here in a transverse plane substantially perpendicular to the optical axis X1.
  • the second lens 46 is here shifted longitudinally forwards with respect to the front end edge of the first lens 38.
  • the second lens 46 extends laterally towards the longitudinal axis X0 of the vehicle 10 by a transparent portion 47 which passes the light rays emitted by the source 16 without deflecting them, so that they reach the parabolic mirror 22 and so that they are reflected longitudinally forward.
  • the front face 48 of the distribution screen 24 comprises optical diffusion elements 50 which laterally distribute the light rays received on its rear face 23 so that the photometric characteristics of the signaling beam are in accordance with the regulations.
  • optical diffusion elements 50 are, for example, constituted by a series of torus-shaped cushions whose profile is optimized to distribute the light rays in the regulatory beam.
  • the diffusion optical elements 50 have profiles which are very marked on the side of the left-hand lateral end 26 and which soften toward the rear lateral end 28. This makes it possible to take account of the greater inclination of the screen 24 with respect to the optical axis X1, on the side of the right lateral end 28.
  • the various elements constituting the light 12 are contained in a housing 52 which is closed at the front by a non-deflecting protective glass 54 of similar profile to the distribution screen 24.
  • the protective glass 54 is transparent or has optical elements which must be taken into account to calculate the optical distribution elements of the screen 24.
  • the screen 24 and the protective glass 54 can be combined into a single component, which reduces the cost of the device.
  • the screen 24 comprises a first lateral section, or left section 56, which receives the light rays reflected by the parabolic mirror 22, a second lateral section, or right section 58, which receives the light rays reflected by the plane to rungs 20, and an intermediate section 60, arranged between the two lateral sections 56, 58, which receives the light rays rectified by the second lens 46.
  • the arrangement of the stepped plane 20 behind the source 16 makes it possible to produce a signaling light comprising a straight section 58 strongly curved towards the rear and to the right.
  • the generatrix of the distribution screen 24 extends generally in a horizontal plane.
  • the generatrix of the distribution screen 24 can take various curved and / or inclined shapes that are not contained in a horizontal plane.
  • the rearmost segment always corresponds to the portion of the fire 12 having the step plane 20.
  • each reflector 20, 22 is always arranged longitudinally vis-à-vis -vis the corresponding section 56, 58, 60 of the distribution screen 24.
  • the right lateral section 58 can both be bent backwards and upwards, from the intermediate section 60.
  • the edges of the step plane 20 connecting its two lateral ends 34, 36 follow the curve drawn by the right lateral section 58 of the screen 24 in a transverse vertical plane.
  • the generatrix of the distribution screen 24 may be contained generally in a longitudinal vertical plane.
  • the signaling light 12 according to the invention has a particularly good light output, while having a good light homogeneity on the entire front face 48 of the distribution screen 24.
  • the left signaling light 14 of the vehicle 10 is symmetrically made to the right signaling light 12, with respect to a vertical longitudinal plane of symmetry.
  • the projector according to the invention produces a regulatory beam of unbreakable lighting such as a beam of driving light.

Abstract

The lamp has a stepped plane (20) and a parabolic mirror (22) to reflect light rays emitted by a light source (16) on a rear side (23) of a distributing screen (24). A Fresnel lens (38) is interposed in the path of the rays, between the source and the plane (20). The lens adjusts the rays to permit reflection of the rays on facets (32) of the plane (20) along a longitudinal direction oriented towards front.

Description

La présente invention concerne un projecteur d'éclairage ou de signalisation de véhicule automobile, qui est prévu pour réaliser un faisceau réglementaire d'éclairage ou de signalisation dirigé globalement vers l'avant suivant un axe optique longitudinal, comportant une source lumineuse, un premier et un second réflecteurs qui sont agencés latéralement, par rapport à la direction longitudinale, de part et d'autre de la source lumineuse, et qui réfléchissent les rayons lumineux émis par la source globalement longitudinalement vers l'avant, sur la face arrière d'un écran de répartition qui est agencé longitudinalement en vis-à-vis des réflecteurs de manière à étaler au moins latéralement les rayons lumineux en vue de former le faisceau réglementaire, du type dans lequel l'écran de répartition a globalement la forme d'un bandeau étiré dans le sens de sa longueur, au moins un réflecteur étant constitué par un plan à échelons, le plan à échelons comportant une série de facettes de renvoi sensiblement parallèles, un premier élément optique (38) étant interposé sur le trajet des rayons lumineux émis par la source lumineuse (16), entre la source lumineuse (16) et le plan à échelons (20), le premier élément optique (38) étant prévu pour redresser les rayons lumineux émis par la source (16) en un faisceau de lumière sensiblement parallèle dirigée vers le plan à échelons (20) qui renvoie par réflexion les rayons lumineux dans une direction longitudinale orientée vers l'avant.The present invention relates to a searchlight or signaling of a motor vehicle, which is intended to provide a regulatory lighting or signaling beam directed generally forwardly along a longitudinal optical axis, comprising a light source, a first and a second reflector which is arranged laterally, with respect to the longitudinal direction, on either side of the light source, and which reflects the light rays emitted by the source generally longitudinally forwards, on the rear face of a light source; distribution screen which is arranged longitudinally vis-à-vis the reflectors so as to spread at least laterally the light rays to form the regulatory beam, of the type in which the distribution screen has generally the shape of a strip stretched in the direction of its length, at least one reflector being constituted by an echelon plane, the echelon plane comprises a series of substantially parallel return facets, a first optical element (38) being interposed in the path of the light rays emitted by the light source (16) between the light source (16) and the step plane (20), the first optical element (38) being arranged to straighten the light rays emitted by the source (16) into a substantially parallel light beam directed towards the step plane (20) which reflects by reflection the light rays in a longitudinal direction oriented towards forward.

Un tel projecteur est connu par exemple du document EP-A-0 299 091.Such a projector is known for example from EP-A-0 299 091.

Il est déjà connu de réaliser des feux de signalisation en forme de bandeau lumineux étiré par exemple horizontalement.It is already known to produce traffic lights in the form of a strip of light stretched for example horizontally.

Les constructeurs de véhicule manifestent un intérêt particulier pour ce type de feu car ils s'intègrent de manière esthétique et aérodynamique dans la ligne du véhicule.Vehicle manufacturers are particularly interested in this type of light because they integrate aesthetically and aerodynamically into the vehicle line.

Toutefois, lorsqu'on réalise un feu qui s'étire sur une grande longueur, il n'est pas possible d'utiliser uniquement des réflecteurs de forme globalement parabolique pour éclairer l'écran de répartition de manière sensiblement homogène sur toute sa surface. En effet, la place disponible sur le véhicule ne permet généralement pas l'utilisation d'une parabole suffisamment profonde pour collecter le flux nécessaire à la réalisation de la fonction.However, when a long-stretching fire is made, it is not possible to use only parabolically shaped reflectors to illuminate the distribution screen of substantially homogeneous manner over its entire surface. Indeed, the space available on the vehicle does not generally allow the use of a parable deep enough to collect the flow necessary for the realization of the function.

Si on utilise une parabole de focale importante, le flux recueilli est alors trop faible pour permettre de réaliser des faisceaux réglementaires efficaces.If a large focal dish is used, the flux collected is then too small to allow efficient regulatory beams to be made.

Pour remédier à ce problème, il est possible d'utiliser des paraboles à échelons, mais cette solution ne résout pas le problème du flux lumineux qui est encore trop faible aux extrémités latérales du feu, c'est-à-dire aux extrémités du bandeau.To remedy this problem, it is possible to use ladder parabolas, but this solution does not solve the problem of the light flux which is still too weak at the lateral ends of the fire, that is to say at the ends of the strip. .

On obtient donc un feu comportant une plage éclairante manquant d'homogénéité, l'intensité lumineuse étant forte au milieu du feu et faible sur les bords, au regard de la forte intensité au centre.We thus obtain a fire with an illuminating surface lacking homogeneity, the light intensity being strong in the middle of the fire and low on the edges, with regard to the strong intensity in the center.

Le document EP-B-0.290.347 décrit et représente un exemple de conception de feu dit linéaire présentant une plage éclairante quasiment homogène.Document EP-B-0,290,347 describes and represents an example of a so-called linear fire design having an almost homogeneous illuminating surface.

Toutefois, cette conception de feu ne permet pas d'obtenir un flux lumineux suffisamment élevé pour réaliser certaines fonctions réglementaires, notamment dans le cas des feux agencés dans la face avant du véhicule.However, this fire design does not provide a sufficiently high luminous flux to perform certain regulatory functions, especially in the case of lights arranged in the front of the vehicle.

De plus, cette conception de feu met en jeu des techniques très pointues pour la réalisation des pièces constituant le feu, notamment un écran de sortie présentant sur sa face interne des dents travaillant en réflexion totale.In addition, this fire design involves cutting-edge techniques for the production of parts constituting fire, including an exit screen having on its inner face teeth working in total reflection.

La présente invention vise à remédier à ces inconvénients en proposant un feu possédant un rendement lumineux amélioré.The present invention aims to overcome these disadvantages by providing a fire with improved light output.

Dans ce but, l'invention propose un projecteur d'éclairage ou de signalisation du type décrit précédemment, dans lequel le premier élément optique est un élément de Fresnel, et le premier réflecteur est un plan à échelons et le second réflecteur est un miroir globalement parabolique, la source lumineuse étant agencée sensiblement au foyer de la parabole.For this purpose, the invention proposes a lighting or signaling projector of the type described above, in which the first optical element is a Fresnel element, and the first reflector is a step plane and the second reflector is a mirror overall. parabolic, the light source being arranged substantially in the focus of the dish.

Selon d'autres caractéristiques de l'invention :

  • le plan à échelon est incliné par rapport à un plan transversal à l'axe optique en partant de l'arrière de la source lumineuse au bord de l'écran de sortie de façon à éclairer ce dernier jusqu'au bord ;
  • un second élément optique de Fresnel est interposé entre la source lumineuse et la face arrière de l'écran de répartition de manière à redresser longitudinalement les rayons lumineux qui sont émis par la source lumineuse directement vers l'écran et qui ne sont pas en mesure d'atteindre les réflecteurs ;
  • une ou les face(s) de l'écran de répartition comporte(nt) des éléments optiques qui répartissent la lumière pour former le faisceau réglementaire ;
  • l'écran de répartition est engendré par une génératrice qui peut prendre différentes formes courbées et/ou inclinées contenues en dehors d'un plan horizontal ;
  • le tronçon situé le plus en arrière correspond à la portion du feu comportant le plan à échelons ;
  • la forme des réflecteurs et l'orientation des lentilles sont adaptés à la forme de la génératrice de l'écran de répartition de sorte que chaque réflecteur soit toujours agencé longitudinalement en vis-à-vis du tronçon correspondant de l'écran de répartition ;
  • l'écran est intégré à la glace de fermeture.
According to other features of the invention:
  • the step plane is inclined with respect to a plane transverse to the optical axis from the rear of the light source at the edge of the exit screen so as to illuminate the latter to the edge;
  • a second Fresnel optical element is interposed between the light source and the rear face of the distribution screen so as to longitudinally straighten the light rays which are emitted by the light source directly to the screen and which are not able to to reach the reflectors;
  • one or more faces of the distribution screen comprise (s) optical elements which distribute the light to form the regulatory beam;
  • the distribution screen is generated by a generator which can take different curved shapes and / or inclined contained outside a horizontal plane;
  • the rearmost section is the portion of the light with the rung;
  • the shape of the reflectors and the orientation of the lenses are adapted to the shape of the generatrix of the distribution screen so that each reflector is always arranged longitudinally vis-à-vis the corresponding section of the distribution screen;
  • the screen is integrated with the closing window.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue partielle en perspective qui représente un véhicule équipé de deux feux de signalisation réalisés conformément aux enseignements de l'invention ;
  • la figure 2 est une vue en coupe longitudinale selon un plan de coupe horizontal qui représente schématiquement le feu de signalisation droit du véhicule de la figure 1.
Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
  • Figure 1 is a partial perspective view showing a vehicle equipped with two traffic lights made according to the teachings of the invention;
  • Figure 2 is a longitudinal sectional view along a horizontal sectional plane which schematically shows the right signal light of the vehicle of Figure 1.

Pour la description de l'invention, on adoptera à titre non limitatif les orientations verticale, longitudinale et transversale selon le repère V, L, T indiqué aux figures.For the description of the invention, the vertical, longitudinal and transverse orientations according to the reference V, L, T indicated in the figures will be adopted without limitation.

Dans la description qui va suivre, des éléments identiques, similaires ou analogues seront désignés par les mêmes chiffres de référence.In the following description, identical, similar or similar elements will be designated by the same reference numerals.

Sur la figure 1, on a représenté schématiquement la face avant d'un véhicule automobile 10 qui est équipé de deux feux de signalisation, respectivement droit 12 et gauche 14, réalisés conformément aux enseignements de l'invention.In Figure 1, there is shown schematically the front face of a motor vehicle 10 which is equipped with two traffic lights, respectively right 12 and left 14, made according to the teachings of the invention.

Chacun de ces feux 12, 14 remplit, par exemple, une fonction d'indicateur de direction et réalise donc un faisceau réglementaire d'éclairage correspondant, suivant un axe optique longitudinal X1 orienté vers l'avant et sensiblement parallèle à l'axe longitudinal X0 du véhicule 10.Each of these lights 12, 14 fills, for example, a direction indicator function and therefore carries a corresponding lighting regulatory beam, along a longitudinal optical axis X1 facing forward and substantially parallel to the longitudinal axis X0 of the vehicle 10.

Sur la figue 2, on a représenté en détail le feu de signalisation droit 12.FIG. 2 shows in detail the right signal light 12.

L'orientation de l'axe optique X1 de l'arrière vers l'avant correspond à une orientation de la gauche vers la droite, lorsque l'on considère la figure 2, le côté gauche du feu 12 se situant en haut de la figure 2 et le côté droit se situant en bas de la figure 2.The orientation of the optical axis X1 from the rear to the front corresponds to an orientation of the left to the right, when one considers FIG. 2, the left side of the light 12 being at the top of the figure 2 and the right side at the bottom of Figure 2.

Le feu 12 comporte une source lumineuse 16 qui est constituée ici par le filament d'une lampe 18.The light 12 comprises a light source 16 which is constituted here by the filament of a lamp 18.

Selon le mode de réalisation représenté ici, la lampe 18 est insérée axialement dans un logement complémentaire 19 suivant une direction axiale X3 qui est contenue dans un plan horizontal et qui est faiblement inclinée par rapport à une direction transversale.According to the embodiment shown here, the lamp 18 is inserted axially into a complementary housing 19 in an axial direction X3 which is contained in a horizontal plane and which is slightly inclined relative to a transverse direction.

Le feu 12 comporte un premier 20 et un second 22 réflecteurs qui sont agencés latéralement, par rapport à l'axe optique X1, de part et d'autre de la source lumineuse 16, respectivement à droite et à gauche de celle-ci 16.The light 12 has a first 20 and a second 22 reflectors which are arranged laterally, with respect to the optical axis X1, on either side of the light source 16, respectively to the right and to the left of the latter 16.

Les réflecteurs 20, 22 réfléchissent les rayons lumineux émis par la source 16 globalement longitudinalement vers l'avant, sur la face arrière 23 d'un écran de répartition 24 qui est agencé longitudinalement en vis-à-vis des réflecteurs 20, 22.The reflectors 20, 22 reflect the light rays emitted by the source 16 generally longitudinally forward, on the rear face 23 of a distribution screen 24 which is arranged longitudinally vis-à-vis the reflectors 20, 22.

L'écran de répartition 24 a globalement la forme d'un bandeau qui s'étend dans le sens de sa longueur, globalement suivant une génératrice en forme d'arc de cercle, contenue dans un plan horizontal.The distribution screen 24 has the overall shape of a strip which extends in the direction of its length, generally following a generatrix-shaped arc, contained in a horizontal plane.

La largeur de l'écran de répartition 24 est donc inférieure à sa longueur.The width of the distribution screen 24 is therefore less than its length.

L'écran de répartition 24 comporte une extrémité latérale gauche 26 qui est agencée du côté de l'axe longitudinal X0 du véhicule 10, en avant du feu 12, et une extrémité latérale droite 28 qui est agencée du côté du flanc droit du véhicule 10, longitudinalement en arrière par rapport l'extrémité gauche 26.The distribution screen 24 has a left-hand lateral end 26 which is arranged on the side of the longitudinal axis X 0 of the vehicle 10, in front of the light 12, and a right-hand lateral end 28 which is arranged on the side of the right side of the vehicle 10 , longitudinally behind the left end 26.

L'écran de répartition 24 épouse globalement la forme arrondie de la portion de carrosserie du véhicule 10 dans laquelle il est agencé. Par conséquent, l'arc de cercle dessiné par l'écran de répartition 24 tend à se rapprocher, vers l'arrière, d'une direction longitudinale.The distribution screen 24 generally matches the rounded shape of the body portion of the vehicle 10 in which it is arranged. Consequently, the arc of a circle drawn by the distribution screen 24 tends to approach towards the rear in a longitudinal direction.

Conformément aux enseignements de l'invention, le premier réflecteur 20 est constitué par un plan à échelons.According to the teachings of the invention, the first reflector 20 is constituted by a stepped plane.

Le plan à échelons 20 s'étend ici dans un plan sensiblement vertical qui est incliné par rapport à un plan transversal, l'extrémité latérale gauche 34 du plan à échelons 20 étant décalée longitudinalement vers l'avant relativement à l'extrémité latérale droite 36.The stepped plane 20 extends here in a substantially vertical plane which is inclined with respect to a transverse plane, the left lateral end 34 of the stepped plane 20 being offset longitudinally forwards relative to the right lateral end 36 .

La face avant 30 du plan à échelons 20 comporte une série de facettes 32 réfléchissantes verticales orientées globalement vers l'avant.The front face 30 of the echelon plane 20 comprises a series of vertically reflecting reflective facets 32 oriented globally forwards.

Avantageusement le plan à échelons 20 est incliné par rapport à un plan transversal à l'axe optique en partant de l'arrière de la source lumineuse 16 pour constituer l'extrémité latérale gauche 34 jusqu'à l'extrémité latérale droite 36 à l'arrière du bord de l'écran de sortie 28 .Advantageously, the step plane 20 is inclined with respect to a plane transverse to the optical axis from the rear of the light source 16 to form the left-hand lateral end 34 to the right-hand lateral end 36. back of the edge of the output screen 28.

Selon une autre caractéristique de l'invention, un premier élément optique de Fresnel, dit première lentille 38, est interposé sur le trajet des rayons lumineux émis par la source 16, entre la source 16 et la face avant 30 du plan à échelons 20.According to another characteristic of the invention, a first Fresnel optical element, said first lens 38, is interposed on the path of the light rays emitted by the source 16, between the source 16 and the front face 30 of the step plane 20.

La première lentille 38 s'étend ici dans un plan sensiblement vertical, qui décrit globalement un angle aigu avec la face avant 30 du plan à échelons 20.The first lens 38 extends here in a substantially vertical plane, which generally describes an acute angle with the front face 30 of the echelon plane 20.

Les éléments dioptriques 42 de réfraction, qui sont agencés sur la face optique de sortie 40 de la première lentille 38, forment ici des couronnes, ou secteurs de couronne, concentriques centrées sur un axe optique secondaire X2 passant par la source lumineuse 16 et traversant la face avant 30 du plan à échelons 20.The refractive dioptric elements 42, which are arranged on the optical exit face 40 of the first lens 38, form concentric crowns or crown sectors here centered on a secondary optical axis X 2 passing through the light source 16 and passing through the front face 30 of the stepped plane 20.

L'axe optique secondaire X2 forme ainsi une direction générale incidente qui est dirigée vers la face avant 30 du plan à échelons 20.The secondary optical axis X2 thus forms an incidental general direction which is directed towards the front face 30 of the step plane 20.

Les rayons lumineux collectés par la face optique d'entrée 44 de la première lentille 38 sont redressés suivant l'axe optique secondaire X2 de manière à permettre la réflexion de ces rayons lumineux sur les facettes 32 suivant des directions longitudinales orientées vers l'avant.The light rays collected by the optical input face 44 of the first lens 38 are straightened along the secondary optical axis X2 so as to allow the reflection of these light rays on the facets 32 in longitudinal directions oriented towards the front.

Avantageusement, le second réflecteur 22 est constitué par un miroir globalement parabolique, la source 16 étant agencée sensiblement au foyer de la parabole.Advantageously, the second reflector 22 is constituted by a generally parabolic mirror, the source 16 being arranged substantially at the focus of the dish.

Le miroir parabolique 22 s'étend dans sa surface de réflexion utile de l'extrémité latérale droite 45, du côté de la source 16, à son extrémité latérale gauche 47 derrière l'extrémité 26 de l'écran de sortie dans la direction de l'axe optique.The parabolic mirror 22 extends in its useful reflection surface from the right-hand lateral end 45, on the source side 16, to its left-hand lateral end 47 behind the end 26 of the exit screen in the direction of the optical axis.

Un second élément optique de Fresnel, dit seconde lentille 46, est interposé entre la source 16 et la face arrière 23 de l'écran de répartition 24 de manière à redresser longitudinalement les rayons lumineux qui sont émis par la source 16 directement vers l'écran 24, sans être réfléchis par les réflecteurs 20, 22.A second Fresnel optical element, said second lens 46, is interposed between the source 16 and the rear face 23 of the distribution screen 24 so as to longitudinally straighten the light rays which are emitted by the source 16 directly to the screen 24, without being reflected by the reflectors 20, 22.

La seconde lentille 46 est réalisée de manière similaire à la première lentille 38. Elle s'étend ici dans un plan transversal sensiblement perpendiculaire à l'axe optique X1.The second lens 46 is made similarly to the first lens 38. It extends here in a transverse plane substantially perpendicular to the optical axis X1.

La seconde lentille 46 est ici décalée longitudinalement vers l'avant par rapport au bord d'extrémité avant de la première lentille 38.The second lens 46 is here shifted longitudinally forwards with respect to the front end edge of the first lens 38.

La seconde lentille 46 se prolonge latéralement vers l'axe longitudinal X0 du véhicule 10 par une portion transparente 47 qui laisse passer les rayons lumineux émis par la source 16 sans les dévier, de manière qu'ils atteignent le miroir parabolique 22 et de manière qu'ils soient réfléchis longitudinalement vers l'avant.The second lens 46 extends laterally towards the longitudinal axis X0 of the vehicle 10 by a transparent portion 47 which passes the light rays emitted by the source 16 without deflecting them, so that they reach the parabolic mirror 22 and so that they are reflected longitudinally forward.

De préférence, la face avant 48 de l'écran de répartition 24 comporte des éléments optiques de diffusion 50 qui répartissent latéralement les rayons lumineux reçus sur sa face arrière 23 de manière que les caractéristiques photométriques du faisceau de signalisation soient conformes à la réglementation.Preferably, the front face 48 of the distribution screen 24 comprises optical diffusion elements 50 which laterally distribute the light rays received on its rear face 23 so that the photometric characteristics of the signaling beam are in accordance with the regulations.

Ces éléments optiques de diffusion 50 sont, par exemple, constitués par une série de tores en forme de coussins dont le profil est optimisé pour répartir les rayons lumineux dans le faisceau réglementaire.These optical diffusion elements 50 are, for example, constituted by a series of torus-shaped cushions whose profile is optimized to distribute the light rays in the regulatory beam.

De préférence, les éléments optiques de diffusion 50 ont des profils qui sont très marqués du côté de l'extrémité latérale gauche 26 et qui s'adoucissent vers l'extrémité latérale arrière 28. Ceci permet de tenir compte de l'inclinaison plus importante de l'écran 24 par rapport à l'axe optique X1, du côté de l'extrémité latérale droite 28.Preferably, the diffusion optical elements 50 have profiles which are very marked on the side of the left-hand lateral end 26 and which soften toward the rear lateral end 28. This makes it possible to take account of the greater inclination of the screen 24 with respect to the optical axis X1, on the side of the right lateral end 28.

Selon le mode de réalisation représenté ici, les différentes éléments constituant le feu 12 sont contenus dans un boîtier 52 qui est fermé à l'avant par une glace de protection 54 non déviatrice de profil similaire à l'écran de répartition 24.According to the embodiment shown here, the various elements constituting the light 12 are contained in a housing 52 which is closed at the front by a non-deflecting protective glass 54 of similar profile to the distribution screen 24.

La glace de protection 54 est transparente ou comporte des éléments optiques qui doivent être pris en compte pour calculer les éléments optiques de répartition de l'écran 24.The protective glass 54 is transparent or has optical elements which must be taken into account to calculate the optical distribution elements of the screen 24.

L'écran 24 et la glace de protection 54 peuvent être réunis en un seul composant, ce qui permet de diminuer le coût du dispositif.The screen 24 and the protective glass 54 can be combined into a single component, which reduces the cost of the device.

On constate que l'écran 24 comporte un premier tronçon latéral, ou tronçon gauche 56, qui reçoit les rayons lumineux réfléchis par le miroir parabolique 22, un second tronçon latéral, ou tronçon droit 58, qui reçoit les rayons lumineux réfléchis par le plan à échelons 20, et un tronçon intermédiaire 60, agencé entre les deux tronçons latéraux 56, 58, qui reçoit les rayons lumineux redressés par la seconde lentille 46.It can be seen that the screen 24 comprises a first lateral section, or left section 56, which receives the light rays reflected by the parabolic mirror 22, a second lateral section, or right section 58, which receives the light rays reflected by the plane to rungs 20, and an intermediate section 60, arranged between the two lateral sections 56, 58, which receives the light rays rectified by the second lens 46.

On note que l'agencement du plan à échelons 20 en arrière de la source 16 permet de réaliser un feu de signalisation comportant un tronçon droit 58 fortement recourbé vers l'arrière et vers la droite.It will be noted that the arrangement of the stepped plane 20 behind the source 16 makes it possible to produce a signaling light comprising a straight section 58 strongly curved towards the rear and to the right.

Selon le mode de réalisation représenté ici, la génératrice de l'écran de répartition 24 s'étend globalement dans un plan horizontal.According to the embodiment shown here, the generatrix of the distribution screen 24 extends generally in a horizontal plane.

Selon des variantes de réalisation (non représentées) de l'invention, la génératrice de l'écran de répartition 24 peut prendre différentes formes courbées et/ou inclinées qui ne sont pas contenues dans un plan horizontal. Dans ce cas, le tronçon situé le plus en arrière correspond toujours à la portion du feu 12 comportant le plan à échelons 20.According to alternative embodiments (not shown) of the invention, the generatrix of the distribution screen 24 can take various curved and / or inclined shapes that are not contained in a horizontal plane. In this case, the rearmost segment always corresponds to the portion of the fire 12 having the step plane 20.

Bien entendu, la forme des réflecteurs 20, 22 et l'orientation des lentilles 38, 46 sont adaptés à la forme de la génératrice de l'écran de répartition 24 de sorte que chaque réflecteur 20, 22 soit toujours agencé longitudinalement en vis-à-vis du tronçon 56, 58, 60 correspondant de l'écran de répartition 24.Of course, the shape of the reflectors 20, 22 and the orientation of the lenses 38, 46 are adapted to the shape of the generatrix of the distribution screen 24 so that each reflector 20, 22 is always arranged longitudinally vis-à-vis -vis the corresponding section 56, 58, 60 of the distribution screen 24.

Par exemple, le tronçon latéral droit 58 peut à la fois être recourbé vers l'arrière et vers le haut, à partir du tronçon intermédiaire 60. Les bords du plan à échelons 20 reliant ses deux extrémités latérales 34, 36 suivent la courbe dessinée par le tronçon latéral droit 58 de l'écran 24 dans un plan vertical transversal.For example, the right lateral section 58 can both be bent backwards and upwards, from the intermediate section 60. The edges of the step plane 20 connecting its two lateral ends 34, 36 follow the curve drawn by the right lateral section 58 of the screen 24 in a transverse vertical plane.

Selon un autre exemple de réalisation, la génératrice de l'écran de répartition 24 peut être contenue globalement dans un plan vertical longitudinal.According to another exemplary embodiment, the generatrix of the distribution screen 24 may be contained generally in a longitudinal vertical plane.

Le feu de signalisation 12 selon l'invention bénéficie d'un rendement lumineux particulièrement bon, tout en présentant une bonne homogénéité lumineuse sur toute la face avant 48 de l'écran de répartition 24.The signaling light 12 according to the invention has a particularly good light output, while having a good light homogeneity on the entire front face 48 of the distribution screen 24.

Bien entendu, le feu de signalisation gauche 14 du véhicule 10 est réalisé de manière symétrique au feu de signalisation droit 12, par rapport à un plan longitudinal vertical de symétrie.Of course, the left signaling light 14 of the vehicle 10 is symmetrically made to the right signaling light 12, with respect to a vertical longitudinal plane of symmetry.

Selon une variante de réalisation (non représentée), le projecteur selon l'invention réalise un faisceau réglementaire d'éclairage sans coupure tel qu'un faisceau de feu de route.According to an alternative embodiment (not shown), the projector according to the invention produces a regulatory beam of unbreakable lighting such as a beam of driving light.

Claims (8)

Projecteur d'éclairage ou de signalisation (12) de véhicule automobile (10) qui est prévu pour réaliser un faisceau réglementaire d'éclairage ou de signalisation dirigé globalement vers l'avant suivant un axe optique longitudinal (X1), comportant une source lumineuse (16), un premier (20) et un second (22) réflecteurs qui sont agencés latéralement, par rapport à la direction longitudinale (X1), de part et d'autre de la source lumineuse (16), et qui réfléchissent les rayons lumineux émis par la source (16) globalement longitudinalement vers l'avant, sur la face arrière (23) d'un écran de répartition (24) qui est agencé longitudinalement en vis-à-vis des réflecteurs (20, 22) de manière à étaler au moins latéralement les rayons lumineux en vue de former le faisceau réglementaire, du type dans lequel l'écran de répartition (24) a globalement la forme d'un bandeau étiré dans le sens de sa longueur, au moins un réflecteur (20) étant constitué par un plan à échelons, le plan à échelons (20) comportant une série de facettes (32) de renvoi sensiblement parallèles, un premier élément optique (38) étant interposé sur le trajet des rayons lumineux émis par la source lumineuse (16), entre la source lumineuse (16) et le plan à échelons (20), le premier élément optique (38) étant prévu pour redresser les rayons lumineux émis par la source (16) en un faisceau de lumière sensiblement parallèle dirigée vers le plan à échelons (20) qui renvoie par réflexion les rayons lumineux dans une direction longitudinale orientée vers l'avant, caractérisé en ce que le premier élément optique (38) est un élément de Fresnel (38), et en ce que le premier réflecteur (20) est un plan à échelons et le second réflecteur (22) est un miroir globalement parabolique, la source lumineuse (16) étant agencée sensiblement au foyer de la parabole.Motor vehicle lighting or signaling projector (12) for providing a lighting or signaling beam directed generally forwardly along a longitudinal optical axis (X1), comprising a light source ( 16), a first (20) and a second (22) reflector which are arranged laterally, with respect to the longitudinal direction (X1), on either side of the light source (16), and which reflect the light rays transmitted from the source (16) generally longitudinally forwards, on the rear face (23) of a distribution screen (24) which is arranged longitudinally opposite the reflectors (20, 22) so as to at least laterally spreading the light rays in order to form the regulatory beam, of the type in which the distribution screen (24) has generally the shape of a band stretched in the direction of its length, at least one reflector (20) being constituted by a plan to be the step plane (20) having a plurality of substantially parallel deflection facets (32), a first optical element (38) interposed on the path of the light rays emitted by the light source (16) between the light source (16) and the step plane (20), the first optical element (38) being arranged to straighten the light rays emitted by the source (16) into a substantially parallel light beam directed towards the step plane (20) which reflectively returns the light rays in a longitudinal direction oriented forward, characterized in that the first optical element (38) is a Fresnel element (38), and in that the first reflector (20) is a plane to echelons and the second reflector (22) is a generally parabolic mirror, the light source (16) being arranged substantially at the focus of the dish. Projecteur (12) selon la revendication précédente caractérisé en ce que le plan à échelon (20) est incliné par rapport à un plan transversal à l'axe optique en partant de l'arrière de la source lumineuse (16) au bord de l'écran de sortie de façon à éclairer ce dernier jusqu'au bord.Projector (12) according to the preceding claim characterized in that the step plane (20) is inclined relative to a plane transverse to the optical axis from the rear of the light source (16) to the edge of the exit screen to illuminate it to the edge. Projecteur (12) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un second élément optique de Fresnel (46) est interposé entre la source lumineuse (16) et la face arrière (23) de l'écran de répartition (24) de manière à redresser longitudinalement les rayons lumineux qui sont émis par la source lumineuse (16) directement vers l'écran (24) et qui ne sont pas en mesure d'atteindre les réflecteurs (20, 22).Projector (12) according to one of the preceding claims, characterized in that a second Fresnel optical element (46) is interposed between the light source (16) and the rear face (23) of the distribution screen (24) so as to longitudinally straighten the light rays which are emitted by the light source (16) directly to the screen (24) and which are not able to reach the reflectors (20, 22). Projecteur (12) selon l'une quelconque des revendications précédentes, caractérisé en ce que une ou les face(s) de l'écran de répartition (24) comporte(nt) des éléments optiques qui répartissent la lumière pour former le faisceau réglementaire.Projector (12) according to any one of the preceding claims, characterized in that one or face (s) of the distribution screen (24) comprise (s) of the optical elements that distribute the light to form the regulatory beam. Projecteur (12) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'écran de répartition (24) est engendré par une génératrice qui peut prendre différentes formes courbées et/ou inclinées contenues en dehors d'un plan horizontal.Projector (12) according to any one of the preceding claims, characterized in that the distribution screen (24) is generated by a generatrix which can take different curved shapes and / or inclined contained outside a horizontal plane. Projecteur (12) selon la revendication précédente, caractérisé en ce que le tronçon situé le plus en arrière correspond à la portion du feu 12 comportant le plan à échelons 20.Projector (12) according to the preceding claim, characterized in that the rearmost portion corresponds to the portion of the fire 12 having the step plane 20. Projecteur (12) selon la revendication précédente, caractérisé en ce que la forme des réflecteurs (20, 22) et l'orientation des lentilles (38, 46) sont adaptés à la forme de la génératrice de l'écran de répartition (24) de sorte que chaque réflecteur (20, 22) soit toujours agencé longitudinalement en vis-à-vis du tronçon (56, 58, 60) correspondant de l'écran de répartition 24.Projector (12) according to the preceding claim, characterized in that the shape of the reflectors (20, 22) and the orientation of the lenses (38, 46) are adapted to the shape of the generatrix of the distribution screen (24) so that each reflector (20, 22) is always arranged longitudinally opposite the section (56, 58, 60) corresponding to the distribution screen 24. Projecteur (12) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'écran (24) est intégré à la glace de fermeture.Projector (12) according to any one of the preceding claims, characterized in that the screen (24) is integrated with the closure glass.
EP05291597A 2004-09-07 2005-07-26 String shaped headlamp or signalling lamp comprising a stepped reflector Not-in-force EP1632710B1 (en)

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FR0409478A FR2874994B1 (en) 2004-09-07 2004-09-07 BAND-SHAPED LIGHTING OR SIGNALING PROJECTOR COMPRISING A PLANAR MIRROR

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EP1632710A3 EP1632710A3 (en) 2008-11-05
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EP (1) EP1632710B1 (en)
AT (1) ATE449286T1 (en)
DE (1) DE602005017716D1 (en)
ES (1) ES2334146T3 (en)
FR (1) FR2874994B1 (en)

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FR2874994A1 (en) 2006-03-10
EP1632710A3 (en) 2008-11-05
DE602005017716D1 (en) 2009-12-31
EP1632710B1 (en) 2009-11-18
FR2874994B1 (en) 2006-11-24
US20060050520A1 (en) 2006-03-09
ES2334146T3 (en) 2010-03-05
ATE449286T1 (en) 2009-12-15

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