EP2006605B1 - Vehicle headlamp - Google Patents

Vehicle headlamp Download PDF

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Publication number
EP2006605B1
EP2006605B1 EP08157969A EP08157969A EP2006605B1 EP 2006605 B1 EP2006605 B1 EP 2006605B1 EP 08157969 A EP08157969 A EP 08157969A EP 08157969 A EP08157969 A EP 08157969A EP 2006605 B1 EP2006605 B1 EP 2006605B1
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EP
European Patent Office
Prior art keywords
cover
module according
fact
cache
module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08157969A
Other languages
German (de)
French (fr)
Other versions
EP2006605A1 (en
Inventor
Philippe Arlon
Jonathan Blandin
David Bourdin
Christian Kulig
Rémy Letoumelin
Benoît Reiss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP2006605A1 publication Critical patent/EP2006605A1/en
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Publication of EP2006605B1 publication Critical patent/EP2006605B1/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
    • 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
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/686—Blades, i.e. screens moving in a vertical plane
    • 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
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors

Definitions

  • the headlamps of a vehicle shall illuminate portions of road at different lengths in front of the vehicle, without dazzling other road users, whether they are traveling in the same direction or in the opposite direction.
  • the shortest range of light with which a vehicle can follow or cross another vehicle is that which corresponds to the low beam.
  • the cutoff line of the projector is oriented with a slope of 1%. Under these conditions, the light rays illuminate the ground for about 70 meters ahead of the vehicle. This distance, however, depends on the height of the projector relative to the ground.
  • the document US2006039158 describes a cover that has two extreme positions corresponding to the low beam and high beam, and between these two positions several intermediate positions.
  • the document DE102004063836 proposes an electronic system to adapt the range of the projectors according to the traffic conditions.
  • the document US6550944 discloses a device that modifies the intensity distribution by moving an element of the optical module so as to modify the orientation of the light rays within the module.
  • EP1746340 also describes a device for enhancing the intensity of the light beam emitted by the projector.
  • An additional optical element called "folding" is associated with the cache, this element captures some of the rays directed against the cache and returns them over the cache.
  • Such a mode of construction gives good results.
  • the intensity of the beam emitted by the light source in low beam is sufficient without the folder to follow or cross another vehicle without risk of blindness.
  • Patent applications EP985577 and EP1679226 describe constructions of this kind.
  • an elevation of the beam redistributes the flux emitted by the lamp. If the beam is raised, the range increases, but the area near the vehicle is less illuminated.
  • An “optically active position” is understood to mean a position of the cache such that it intercepts a portion of the rays emitted directly by the source or reflected by the reflector.
  • the “extreme” position is the “active” position where the cache intercepts the most rays, the one where it is in the most raised position generally, in contrast to the optional intermediate position.
  • the module is a so-called bi-function module, which can for example operate in code mode (active position of the cache creating a given cut-off beam) and in road mode (retracted position of the cache).
  • the module is a tri-function module, able to emit a second cut-off beam different from the first.
  • the cover can be movable according to different types of movement, it can be a translation, for example in a substantially horizontal plane and perpendicular to the optical axis of the module. It can also be rotated about an axis, or combine translational and rotational movements, for example.
  • the optically extreme active position of the cache corresponds to the emission by the module of a code beam. It is in this case that it is indeed wise to optically inactivate the folder to avoid it returns more light above the cut, which could make the beam code illegal.
  • the optically intermediate active position of the cache corresponds to the emission by the module of a motorway beam.
  • the cover and folder can be associated in different ways: they can be mounted jointly to one another, they can also be an integral part of the same element. They can also be independent components, which can be animated with different movements.
  • the cache is mobile, and the folder can also be mobile (having the same movements as the cache or not) or be static.
  • front is understood throughout the present text according to the position of the module once integrated, possibly in a projector, and mounted on a vehicle in normal operating mode.
  • An additional optical member is associated with the cache. This body called "bending" is located between the light source and the cache. It can be associated with the cache. Its basic function is to intercept some of the light rays that are directed against the cache and send them back over the cache so as to enhance the intensity of the light beam emitted by the projector for at least some of the positions of the cache.
  • the movements of the folder and the cover are synchronized so that the cover is movable in a direction substantially perpendicular to the optical axis of the projector (and preferably substantially in a vertical plane) to provide a line clear cut and precise and also to control one or more intermediate positions.
  • the folder is then advantageously "masked” or “optically inactivated” when the cover is in the extreme optically active position: the folder enters into action only when the cover is in an intermediate position, and the folder becomes inactive ( optically) when the cover is in a passive / retracted position.
  • the Figures 2 to 5 illustrate a first embodiment of the invention.
  • the cache 23 is an opaque element. It has at its top a reflective surface 25 oriented parallel to the optical axis of the projector which forms the folder.
  • the surface 25 is for example a film or a thin reflective coating which is deposited at the top of a block which forms the cover.
  • the folder follows the path of the cutoff line, that is to say it has for the illustrated embodiment two bearings 25a, 25b separated by a connecting slope 25c.
  • the cover 23 is movable perpendicular to the optical axis of the projector, and it is in the active position where it intercepts a portion of the light rays emitted by the light source 22.
  • the cutoff line of the projector is centered on the axis optical yy of the projector.
  • the reflecting surface 25 is not very active, that is to say that it intercepts few light rays because the reflecting surface 25 is in a part of the space where the concentration of the rays is less.
  • only part of the cover may have a reflective coating, particularly only one of the bearings of the cutoff line could be reflective.
  • the blade is shorter than the cut-off line and extends only along part of the length of the line. According to another variant, the blade is reflective only over part of its length.
  • the cache 43 has a traditional structure.
  • the folder 45 is the reflective upper surface of a block 45a located near the cover on the side of the light source.
  • Block 45a is translucent (transparent) that is to say that it can be crossed by light rays without significantly disturbing their direction or intensity.
  • the block is for example a glass block 2 to 10 mm, in particular 2 to 4 millimeters thick, and preferably 3 or 5 millimeters, whose upper surface is aluminized and is placed in such a way that the reflecting surface 45 is in the immediate vicinity of the optical axis of the projector, just a little below the cutoff line of the cache in its active position.
  • the folder may be shaped so as to follow the contour of the cut line of the cover 43. Also, the folder may cover only part of the length of the cut line.
  • the figure 10b illustrates a variant of the figure 10a as regards the block 45: the front face 45b of the block is inclined towards the front (it is understood in all the text by "front” or rear "the positioning of the considered surface according to the path of the light from the source towards the output of the optical module) of an angle ⁇ of about 17 ° with respect to the vertical represented by the axis ⁇ (measured inversely in the trigonometrical direction). And the rear face 45c of the block is inclined backwards by an angle ⁇ 'also about 17 ° relative to the vertical (in the trigonometrical direction).
  • the figure 10c is a variant of the figure 10b : the front face 45b of the block is more inclined forward than the rear face 45c is backward.
  • an angle ⁇ of about 20 ° and an angle ⁇ 'of about 5 °. It has been found that it is the inclination of the front face 45b of the block that is most effective for deflecting the spokes in a controlled manner, and the rear face can therefore have a smaller inclination, or even be simply in a plane. vertical as at the figure 10a .
  • the mask hides the folder when it is in the active position. In addition, it is moved according to two distinct modes of displacement.
  • the movement of the cover 3 is controlled by a motor 55 and via a transmission assembly 56.
  • the motor is of any suitable type, for example it is a DC motor, or a stepper motor .
  • the transmission assembly is for example a screw mechanism which converts the rotation of the motor shaft into a translation.
  • the first member 64 is an electromagnet whose stroke is substantially equal to the race of the cover between its active position and its passive position.
  • the electromagnet allows rapid movement of the cover between these two positions.
  • the second element 65 is a motor, for example a stepper motor, which drives a screw mechanism that converts the rotation of the motor shaft into a translation. This member provides low amplitude movement of the cache between an active position and an intermediate position.
  • the displacement member of the cover 73 is a cam 74 driven in rotation by a motor 75.
  • a spring 76 recalls the cover so that it is in contact with the cam.
  • the figure 18 shows the cam path 74a in developed.
  • a first segment 75 corresponds to the active position of the cache, which corresponds to the low beam.
  • the following segment 76 has a low slope, it ensures a small amplitude displacement of the cache in one or more intermediate positions depending on the rotation angle of the cam.
  • the means for moving the cache are controlled by any appropriate means, automatic or manual.
  • it is a radar that detects the distance with the vehicle tracked or encountered, or any other device.
  • control of the present device can be achieved in coordination with a correction device which adjusts the light beam according to the attitude of the vehicle, that is to say that the same optical elements or the same control elements can be used to improve the range of the projector according to the invention, or to achieve a beam correction in relation to the attitude of the vehicle.
  • the module can be used both for the regulatory lighting functions and for the AFS functions that have been mentioned at the beginning of the description and generally for any lighting or signaling function that the projector is likely to fill.
  • this module can be coupled with an automatic switching device from one type of beam to another, such as for example that described in the patent application. FR2877892 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The module has a cover (3) movable between an optically active extreme position in which the cover intercepts part of luminous rays emitted by a luminous source e.g. halogen lamp, and reflected by an ellipsoidal reflector (1), and a passive retracted position. A folding machine i.e. reflective blade, intercepts the part of the luminous rays, and returns the rays above the cover in the extreme position. The cover is movable along direction perpendicular to an optical axis (y-y) of the reflector, and provides optically inefficient folding machine when the cover is found in the extreme position.

Description

La présente invention a pour objet un module optique pour dispositif d'éclairage automobile du type projecteur. Elle s'applique plus particulièrement aux modules optiques appelés modules elliptiques comprenant une source de lumière associée à un réflecteur et fermé par un élément dioptrique du type lentille convergente, par exemple une lentille de type plan-convexe, lentille de Fresnel. L'invention s'intéresse aux modules optiques équipés d'un cache fixe ou mobile apte à intercepter au moins partiellement, selon sa position, le faisceau lumineux émis par l'ensemble source lumineuse/réflecteur. La forme du bord supérieur du cache permet de délimiter la coupure voulue dans le faisceau par imagerie avec la lentille convergente.The present invention relates to an optical module for automobile lighting device of the projector type. It applies more particularly to optical modules called elliptical modules comprising a light source associated with a reflector and closed by a dioptric element of the convergent lens type, for example a plano-convex lens, Fresnel lens. The invention is concerned with optical modules equipped with a fixed or movable cover able to intercept at least partially, depending on its position, the light beam emitted by the light source / reflector assembly. The shape of the upper edge of the cache makes it possible to define the desired cut in the beam by imaging with the convergent lens.

Pour plus de détails sur les modules à cache mobile, on peut notamment se reporter aux brevets EP1197387 , EP1422471 ou EP1442472 . Le cache mobile, sur commande et grâce à la présence d'un moteur, peut prendre différentes positions par rapport à la source lumineuse, dont au moins une position dite « active » optiquement, c'est-à-dire une position où il occulte effectivement une partie du faisceau lumineux, notamment pour que le module émette un faisceau à coupure, comme un faisceau de type croisement (coupure oblique) ou anti-brouillard (coupure horizontale). Le cache peut ainsi présenter une ou plusieurs positions « actives », par exemple deux, une pour la fonction croisement trafic à droite et une pour la fonction trafic à gauche, et aussi une fonction dite « passive » où il n'occulte pas le faisceau lumineux, permettant ainsi au module d'émettre des faisceaux lumineux sans coupure du type faisceau de route. Pour des exemples de modules à cache fixe, on peut se rapporter notamment au brevet FR2754039 , qui décrit des modules aptes à émettre des faisceaux de croisement ou anti-brouillard par exemple.For more details on mobile cache modules, refer to the patents EP1197387 , EP1422471 or EP1442472 . The mobile cover, on command and thanks to the presence of a motor, can take different positions with respect to the light source, including at least one position called "active" optically, that is to say a position where it obscures actually a part of the light beam, in particular for the module to emit a cut-off beam, such as a cross beam (oblique cut) or anti-fog (horizontal cut). The cache may thus have one or more "active" positions, for example two, one for the traffic crossing function on the right and one for the traffic function on the left, and also a so-called "passive" function where it does not block the beam. light, thus allowing the module to emit light beams without cutoff of the road beam type. For examples of fixed-cache modules, one can refer in particular to the patent FR2754039 , which describes modules able to emit crossover or fog beams for example.

Outre ces fonctions d'éclairage et de signalisation biens connues, de nouvelles fonctions sont apparues récemment, regroupées sous le nom d'AFS (l'abréviation pour « Advanced Frontlighting System » en anglais), qui proposent notamment d'autres types de faisceaux, l'invention permettant de les mettre en oeuvre, notamment à l'aide de caches adaptés aptes à générer les coupures voulues. Il s'agit notamment

  • de la fonction dite BL (Bending Light en anglais pour faisceau tournant), qui peut se décomposer en une fonction dite DBL (Dynamic Bending Light en anglais pour lumière virage mobile) et une fonction dite FBL (Fixed Bending Light en anglais pour lumière virage fixe).La fonction DBL permet de modifier l'orientation d'un faisceau lumineux produit par une source lumineuse, de telle sorte que lorsque le véhicule aborde un virage, la route soit éclairée de façon optimale. La fonction FBL a pour vocation d'éclairer progressivement le bas-côté de la route lorsque le véhicule effectue un virage; à cet effet, on prévoit une source lumineuse supplémentaire qui vient compléter progressivement les feux de croisement ou de route lors de la négociation d'un virage ;
  • de la fonction dite Town Light en anglais, pour feu de ville. Cette fonction assure l'élargissement d'un faisceau de type feu de croisement tout en diminuant légèrement sa portée ;
  • de la fonction dite Motorway Light en anglais, pour faisceau d'autoroute. Cette fonction assure une augmentation de la portée d'un feu de croisement ;
  • une fonction dite AWL (Adverse Weather Light en anglais, pour feu de mauvais temps). Cette fonction assure une modification d'un faisceau de feu de croisement de telle sorte que le conducteur n'est pas ébloui par un reflet de son propre projecteur.
In addition to these well-known lighting and signaling functions, new features have appeared recently, grouped together under the name of AFS (the abbreviation for "Advanced Frontlighting System" in English), which notably propose other types of beams, the invention making it possible to implement them, in particular by means of adapted caches able to generate the cuts required. These include
  • the function called BL (Bending Light in English for rotating beam), which can be broken down into a function called DBL (Dynamic Bending Light in English for light bend mobile) and a function called FBL (Fixed Bending Light in English for light bend fixed The DBL function makes it possible to modify the orientation of a light beam produced by a light source, so that when the vehicle approaches a turn, the road is illuminated optimally. The purpose of the FBL function is to gradually illuminate the side of the road when the vehicle is turning; to this end, there is provided an additional light source which gradually complements the low beam or road when negotiating a turn;
  • of the so-called Town Light function in English, for town fire. This function ensures the widening of a beam type dipped beam while slightly decreasing its range;
  • of the so-called Motorway Light function in English, for motorway beam. This function ensures an increase in the range of a dipped beam;
  • a function called AWL (Adverse Weather Light in English, for fire of bad weather). This function ensures a modification of a beam of passing beam so that the driver is not dazzled by a reflection of his own projector.

Ainsi, les projecteurs qui équipent les véhicules possèdent des fonctions d'éclairage et de signalisation "réglementaires", et en plus ils offrent à l'utilisateur d'autres modes d'éclairage intermédiaire qui contribuent à son confort de conduite et à sa sécurité.Thus, the headlamps that equip the vehicles have "regulatory" lighting and signaling functions, and in addition they offer the user other intermediate lighting modes that contribute to his driving comfort and his safety.

Les projecteurs d'un véhicule doivent éclairer des portions de route sur différentes longueurs en avant du véhicule, sans éblouir les autres utilisateurs de la route, qu'ils circulent dans le même sens ou en sens inverse.The headlamps of a vehicle shall illuminate portions of road at different lengths in front of the vehicle, without dazzling other road users, whether they are traveling in the same direction or in the opposite direction.

Sur un plan réglementaire, la portée d'éclairage la plus courte avec laquelle un véhicule peut suivre ou croiser un autre véhicule est celle qui correspond aux feux de croisement. La ligne de coupure du projecteur est orientée avec une pente de 1%. Dans ces conditions, les rayons lumineux éclairent le sol sur une distance d'environ 70 mètres en avant du véhicule. Cette distance dépend toutefois de la hauteur du projecteur relativement au sol.On a regulatory level, the shortest range of light with which a vehicle can follow or cross another vehicle is that which corresponds to the low beam. The cutoff line of the projector is oriented with a slope of 1%. Under these conditions, the light rays illuminate the ground for about 70 meters ahead of the vehicle. This distance, however, depends on the height of the projector relative to the ground.

Cependant, lorsqu'il n'y a pas de risque d'aveuglement d'un autre véhicule, la portée des feux de croisement peut être augmentée. Différents dispositifs sont proposés en relation avec cette fonction.However, when there is no risk of blindness of another vehicle, the range of low beam can be increased. Different devices are proposed in relation to this function.

Par exemple, le document US2006039158 décrit un cache qui présente deux positions extrêmes correspondant aux feux de croisement et aux feux de route, et entre ces deux positions plusieurs positions intermédiaires.For example, the document US2006039158 describes a cover that has two extreme positions corresponding to the low beam and high beam, and between these two positions several intermediate positions.

Le document DE102004063836 propose un système électronique pour adapter la portée des projecteurs en fonctions des conditions de trafic.The document DE102004063836 proposes an electronic system to adapt the range of the projectors according to the traffic conditions.

Le document FR2762268 propose également une installation pour adapter la portée des projecteurs en fonction de la situation du trafic.The document FR2762268 also proposes an installation to adapt the range of the projectors according to the traffic situation.

Le document US6550944 décrit un dispositif qui modifie la distribution d'intensité par le déplacement d'un élément du module optique de façon à modifier l'orientation des rayons lumineux à l'intérieur du module.The document US6550944 discloses a device that modifies the intensity distribution by moving an element of the optical module so as to modify the orientation of the light rays within the module.

On connaît aussi la demande de brevet EP1746340 qui décrit aussi un dispositif pour renforcer l'intensité du faisceau lumineux émis par le projecteur. Un élément optique additionnel appelé « plieuse » est associé au cache, cet élément capte une partie des rayons dirigés contre le cache et les renvoie au-dessus du cache. Un tel mode de construction donne de bons résultats. Toutefois, le plus souvent, en relation avec la réglementation en cours, l'intensité du faisceau émis par la source lumineuse en feux de croisement est suffisante sans la plieuse pour suivre ou croiser une autre véhicule sans risque d'aveuglement.
Egalement, il existe des dispositifs qui sont prévus pour corriger l'orientation du faisceau lumineux des projecteurs en site et/ou en azimut en fonction de l'assiette du véhicule. Les demandes de brevet EP985577 et EP1679226 décrivent des constructions de ce genre.The patent application is also known EP1746340 which also describes a device for enhancing the intensity of the light beam emitted by the projector. An additional optical element called "folding" is associated with the cache, this element captures some of the rays directed against the cache and returns them over the cache. Such a mode of construction gives good results. However, most often, in relation to the current regulation, the intensity of the beam emitted by the light source in low beam is sufficient without the folder to follow or cross another vehicle without risk of blindness.
Also, there are devices which are provided to correct the orientation of the light beam of the projectors in site and / or in azimuth as a function of the attitude of the vehicle. Patent applications EP985577 and EP1679226 describe constructions of this kind.

Avec ces dispositifs de correction, une élévation du faisceau redistribue le flux émis par la lampe. Si on élève le faisceau, la portée augmente, mais la zone proche du véhicule est moins éclairée.With these correction devices, an elevation of the beam redistributes the flux emitted by the lamp. If the beam is raised, the range increases, but the area near the vehicle is less illuminated.

Avec les dispositifs précédents, l'ouverture du cache augmente la longueur de la zone éclairée sur le sol, mais l'effet est à peine visible.
Compte tenu de cet état de la technique, il existe un besoin pour un projecteur qui est amélioré en ce qu'il permet d'augmenter l'étendue de la zone d'éclairage sans modifier de façon significative les conditions d'éclairage dans des zones éclairées qui sont plus proches du véhicule.With previous devices, opening the cache increases the length of the illuminated area on the ground, but the effect is barely visible.
Given this state of the art, there is a need for a projector which is improved in that it makes it possible to increase the extent of the lighting zone without significantly modifying the lighting conditions in zones illuminated which are closer to the vehicle.

Le module selon l'invention pour dispositif d'éclairage de véhicule automobile comprend :

  • un réflecteur définissant un axe optique,
  • un élément dioptrique,
  • une source lumineuse disposée entre le réflecteur et l'élément dioptrique,
  • un cache, ledit cache étant mobile et présentant
  • au moins une position optiquement active, notamment deux, où le cache intercepte une partie des rayons lumineux émis par la source lumineuse ou réfléchis par le réflecteur, dont une position extrême et une position intermédiaire optionnelle,
  • et au moins une position où le cache est escamoté,
  • un organe de déplacement apte à piloter la position du cache,
  • une plieuse apte à intercepter une partie des rayons lumineux et les renvoyer au-dessus du cache dans au moins une position optiquement active du cache,
le cache étant mobile, notamment selon une direction sensiblement perpendiculaire à l'axe optique (y-y) du projecteur, et étant apte à rendre la plieuse inefficace optiquement quand il se trouve en position optiquement active extrême.The module according to the invention for a motor vehicle lighting device comprises:
  • a reflector defining an optical axis,
  • a dioptric element,
  • a light source arranged between the reflector and the dioptric element,
  • a cache, said cache being movable and presenting
  • at least one optically active position, in particular two, where the cover intercepts a part of the light rays emitted by the light source or reflected by the reflector, including an extreme position and an optional intermediate position,
  • and at least one position where the cache is retracted,
  • a displacement member adapted to control the position of the cache,
  • a folder capable of intercepting a portion of the light rays and returning them above the cover in at least one optically active position of the cover,
the cover being mobile, in particular in a direction substantially perpendicular to the optical axis (yy) of the projector, and being adapted to make the folder inefficient optically when it is in the extreme optically active position.

On comprend par « plieuse inefficace optiquement » le fait

  • que le cache puisse soit intercepter les rayons réfléchis par la plieuse, notamment en étant disposé devant elle et en ayant un bord supérieur plus haut que (les points les plus hauts du bord de) la plieuse,
  • et/ou que la configuration cache /plieuse soit telle que les rayons réfléchis par la plieuse et qui ne seraient pas interceptés par le cache constituent un apport négligeable dans la constitution du faisceau émis par le module, notamment parce que les rayons réfléchis par la plieuse sont « perdus », c'est-à-dire qu'ils passent au dessus du cache mais n'entrent pas ensuite dans l'élément dioptrique (car trop « hauts »), et/ou parce qu'ils entrent dans l'élément dioptrique mais qu'ils en ressortent de façon diffuse, étant défocalisés par rapport à l'élément dioptrique, se retrouvant notamment dans la partie inférieure du faisceau du module et n'en constituant qu'un apport minime).
It is understood by "optically inefficient folder" the fact
  • that the cache can either intercept the rays reflected by the folder, in particular by being arranged in front of it and having an upper edge higher than (the highest points of the edge of) the folder,
  • and / or that the cache / bender configuration is such that the rays reflected by the folder and which are not intercepted by the cover constitute a negligible contribution in the constitution of the beam emitted by the module, in particular because the rays reflected by the folder are "lost", that is to say they pass over the cache but do not enter the dioptric element (because too "high"), and / or because they enter the dioptric element but they emerge in a diffuse manner, being defocused with respect to the dioptric element, found in particular in the lower part of the beam of the module and constituting a minimal contribution).

On comprend par « position active optiquement » une position du cache telle qu'il intercepte une partie des rayons émis directement par la source ou réfléchis par le réflecteur. La position « extrême » est la position « active » où le cache intercepte le plus de rayons, celui où il se trouve dans la position la plus relevée généralement, par contraste avec la position intermédiaire optionnelle.An "optically active position" is understood to mean a position of the cache such that it intercepts a portion of the rays emitted directly by the source or reflected by the reflector. The "extreme" position is the "active" position where the cache intercepts the most rays, the one where it is in the most raised position generally, in contrast to the optional intermediate position.

Quand le cache n'a qu'une position active optiquement extrême et une position escamotée, le module est un module dit bi-fonction, qui peut par exemple fonctionner en mode code (position active du cache créant un faisceau à coupure donnée) et en mode route (position escamotée du cache).When the cache has only an optically extreme active position and a retracted position, the module is a so-called bi-function module, which can for example operate in code mode (active position of the cache creating a given cut-off beam) and in road mode (retracted position of the cache).

Quand le cache a deux positions actives, le module est un module tri-fonction, pouvant émettre un second faisceau à coupure différente du premier.When the cache has two active positions, the module is a tri-function module, able to emit a second cut-off beam different from the first.

Le cache peut être mobile selon différents types de mouvement, il peut s'agir d'une translation, par exemple selon un plan sensiblement horizontal et perpendiculaire à l'axe optique du module. Il peut aussi être mu en rotation autour d'un axe, ou combiner mouvements de translation et de rotation, par exemple.The cover can be movable according to different types of movement, it can be a translation, for example in a substantially horizontal plane and perpendicular to the optical axis of the module. It can also be rotated about an axis, or combine translational and rotational movements, for example.

L'élément dioptrique est notamment une lentille.The dioptric element is in particular a lens.

De préférence, la position active optiquement extrême du cache correspond à l'émission par le module d'un faisceau code. C'est dans ce cas de figure qu'il est en effet judicieux d'inactiver optiquement la plieuse pour éviter qu'elle ne renvoie davantage de lumière au dessus de la coupure, ce qui pourrait rendre le faisceau code non réglementaire.Preferably, the optically extreme active position of the cache corresponds to the emission by the module of a code beam. It is in this case that it is indeed wise to optically inactivate the folder to avoid it returns more light above the cut, which could make the beam code illegal.

De préférence, la position active optiquement intermédiaire du cache correspond à l'émission par le module d'un faisceau autoroute.Preferably, the optically intermediate active position of the cache corresponds to the emission by the module of a motorway beam.

De préférence, la position escamotée du cache correspond à l'émission par le module d'un faisceau route : le cache est alors dans une position substantiellement « passive » activement.Preferably, the retracted position of the cache corresponds to the transmission by the module of a road beam: the cache is then in a substantially "passive" position actively.

Le cache et la plieuse peuvent être associés de différentes façons : ils peuvent être montés solidairement l'un à l'autre, ils peuvent aussi faire partie intégrante d'un même élément. Ils peuvent aussi être des composants indépendants, qui peuvent être donc animés de mouvements différents. Le cache est donc mobile, et la plieuse peut être également mobile (en ayant les mêmes déplacements que le cache ou non) ou être statique.The cover and folder can be associated in different ways: they can be mounted jointly to one another, they can also be an integral part of the same element. They can also be independent components, which can be animated with different movements. The cache is mobile, and the folder can also be mobile (having the same movements as the cache or not) or be static.

L'invention sera mieux comprise en se référant à la description ci-dessous et aux dessins en annexe qui lui sont attachés.

  • La figure 1 est une vue générale d'un projecteur.
  • La figure 2 est relative à un premier mode de mise en oeuvre de l'invention.
  • Les figures 3 à 5 illustrent le fonctionnement du dispositif de la figure 2.
  • La figure 6 est relative à un second mode de mise en oeuvre de l'invention.
  • Les figures 7 à 9 illustrent le fonctionnement du dispositif de la figure 6.
  • Les figures 10a à 10d sont relatives à un autre mode de mise en oeuvre de l'invention.
  • Les figures 11 à 13 illustrent le fonctionnement du dispositif de la figure 10.
  • La figure 14 représente de façon schématique le déplacement du cache.
  • La figure 15 montre un mode de construction particulier de l'organe de déplacement du cache.
  • La figure 16 est relative à une variante de construction de l'organe de déplacement.
  • La figure 17 montre un autre mode de construction de l'organe de déplacement.
  • La figure 18 représente en développé le chemin de came du dispositif de la figure précédente.
  • Les figures 19 et 20 sont relatives à des variantes de construction.
The invention will be better understood by referring to the description below and attached drawings attached thereto.
  • The figure 1 is a general view of a projector.
  • The figure 2 relates to a first embodiment of the invention.
  • The Figures 3 to 5 illustrate the operation of the device of the figure 2 .
  • The figure 6 relates to a second embodiment of the invention.
  • The Figures 7 to 9 illustrate the operation of the device of the figure 6 .
  • The Figures 10a to 10d relate to another embodiment of the invention.
  • The Figures 11 to 13 illustrate the operation of the device of the figure 10 .
  • The figure 14 schematically represents the movement of the cache.
  • The figure 15 shows a particular construction mode of the displacement member of the cache.
  • The figure 16 relates to a construction variant of the displacement member.
  • The figure 17 shows another mode of construction of the displacement member.
  • The figure 18 represents in developed the cam path of the device of the previous figure.
  • The Figures 19 and 20 relate to construction variants.

On comprend dans tout le présent texte les termes « avant », « arrière », « haut », « bas », « supérieur » ou « inférieur » d'après la position du module une fois intégré éventuellement dans un projecteur et monté sur un véhicule en mode de fonctionnement normal.The term "front", "back", "up", "down", "upper" or "lower" is understood throughout the present text according to the position of the module once integrated, possibly in a projector, and mounted on a vehicle in normal operating mode.

En référence à la figure 1, on a représenté schématiquement un projecteur du genre elliptique qui comprend, disposés sur un axe optique y-y, un réflecteur 1 du genre ellipsoïdal recevant une source lumineuse (non représentée dans la figure), du côté de l'ouverture du réflecteur un cache 3 destiné à se placer au voisinage du second foyer (le plus en avant) du réflecteur, et plus vers l'avant une lentille convergente 4 dont le foyer est essentiellement confondu avec ledit second foyer.With reference to the figure 1 schematically there is shown a projector of the elliptical kind which comprises, disposed on an optical axis yy, a reflector 1 of the ellipsoidal genus receiving a light source (not shown in the figure), on the side of the opening of the reflector a cover 3 for to be placed in the vicinity of the second focus (the foremost) of the reflector, and further forward a convergent lens 4 whose focus is essentially coincident with said second focus.

La source lumineuse est de tout type approprié, par exemple du type à filament ou à arc. Il peut s'agir d'une lampe halogène, d'une lampe xénon, ou d'une ou plusieurs diodes électroluminescentes. Les rayons lumineux émis par la source lumineuse sont envoyés en direction de la lentille ou bien directement, ou bien après réflexion sur la paroi du réflecteur. Les rayons forment alors un faisceau lumineux. Selon l'orientation des rayons relativement au cache, les rayons franchissent le cache ou sont interceptés par celui-ci. Ainsi, le cache 3 définit en coopération avec le réflecteur un motif lumineux présentant un profil de coupure inférieure défini par le profil du bord supérieur du cache, et la lentille 4 projette ce motif à l'infini en le retournant sur 180 degrés, pour former un faisceau à profil de coupure supérieure correspondant. Il s'agit en l'espèce d'un profil adapté aux règlements européens en matière de faisceaux de croisement, qui comporte une première demi-droite horizontale située dans le faisceau à gauche (pour un sens de circulation à droite), un segment de droite oblique remontant selon un angle vers la droite par rapport au demi-plan précité, et une deuxième demi-droite horizontale prolongeant le segment oblique vers la droite et décalé vers le haut par rapport à la première demi-droite.The light source is of any suitable type, for example of the filament or arc type. It may be a halogen lamp, a xenon lamp, or one or more light-emitting diodes. The light rays emitted by the light source are sent towards the lens or directly, or after reflection on the reflector wall. The rays then form a light beam. Depending on the orientation of the spokes relative to the cache, the spokes cross the cache or are intercepted by it. Thus, the cover 3 defines in cooperation with the reflector a light pattern having a lower cutoff profile defined by the profile of the upper edge of the cover, and the lens 4 projects this pattern to infinity by turning it over 180 degrees, to form a beam with a corresponding upper cutoff profile. This is a profile adapted to the regulations in the case of passing beam, which has a first horizontal half-line lying in the beam on the left (for a direction of travel on the right), an oblique line segment going up at an angle to the right with respect to the half-plane above, and a second horizontal half-line extending the segment oblique to the right and shifted upwards relative to the first half-line.

Il est clair que le cache pourra définir tout autre profil de coupure approprié.It is clear that the cache can define any other appropriate cutoff profile.

Le cache est mobile. Il présente au moins une position dite « active » optiquement, c'est-à-dire une position où il occulte effectivement une partie du faisceau lumineux, notamment pour que le module émette un faisceau à coupure, comme un faisceau de type croisement (coupure oblique) ou anti-brouillard (coupure horizontale). Le cache peut ainsi présenter une ou plusieurs positions « actives », par exemple deux, une pour la fonction croisement trafic à droite et une pour la fonction trafic à gauche, et aussi une fonction dite « passive » où il a une position escamotée : il n'occulte plus le faisceau lumineux, permettant ainsi au module d'émettre des faisceaux lumineux sans coupure, du type faisceau de route.The cache is mobile. It has at least one position called "active" optically, that is to say a position where it actually obscures a portion of the light beam, in particular for the module to emit a cut-off beam, such as a crossing-type beam (cutoff oblique) or anti-fog (horizontal cut). The cache can thus have one or more "active" positions, for example two, one for the traffic crossing function on the right and one for the traffic function on the left, and also a so-called "passive" function where it has a retracted position: it no longer obscures the light beam, thus allowing the module to emit light beams without cutoff, of the road beam type.

Entre la position active extrême et la position passive, le cache peut occuper une ou plusieurs positions actives intermédiaires dans lesquelles le cache est abaissé et la ligne de coupure projetée est relevée par rapport à la position active.Between the extreme active position and the passive position, the cache can occupy one or more intermediate active positions in which the cache is lowered and the projected cut line is raised relative to the active position.

Le déplacement du cache est réalisé par tout moyen approprié, notamment à l'aide d'un moteur électrique piloté par une commande du tableau de bord ou de façon automatique. Certains modes de construction seront décrits ultérieurement.The displacement of the cover is achieved by any appropriate means, in particular using an electric motor controlled by a control panel or automatically. Some construction methods will be described later.

L'abaissement du cache au niveau du projecteur produit un allongement de la zone éclairée en avant du véhicule.Lowering the cover at the projector results in a longer illuminated area in front of the vehicle.

Un organe optique additionnel est associé au cache. Cet organe dénommé "plieuse" est situé entre la source lumineuse et le cache. Il peut être associé au cache. Sa fonction de base est d'intercepter une partie des rayons lumineux qui sont dirigés contre le cache et de les renvoyer au-dessus du cache de façon à renforcer l'intensité du faisceau lumineux émis par le projecteur pour certaines au moins des positions du cache.An additional optical member is associated with the cache. This body called "bending" is located between the light source and the cache. It can be associated with the cache. Its basic function is to intercept some of the light rays that are directed against the cache and send them back over the cache so as to enhance the intensity of the light beam emitted by the projector for at least some of the positions of the cache.

Dans le cas présent, les déplacements de la plieuse et du cache sont synchronisés de telle façon que le cache soit mobile selon une direction sensiblement perpendiculaire à l'axe optique du projecteur (et de préférence substantiellement dans un plan vertical) afin de fournir une ligne de coupure nette et précise et aussi de maîtriser une ou plusieurs positions intermédiaires. La plieuse se trouve alors avantageusement « masquée » ou « inactivée sur le plan optique » lorsque le cache se trouve en position optiquement active extrême: la plieuse entre en action seulement lorsque le cache se trouve dans une position intermédiaire, et la plieuse devient inactive (optiquement) lorsque le cache se trouve dans une position passive /escamotée.In this case, the movements of the folder and the cover are synchronized so that the cover is movable in a direction substantially perpendicular to the optical axis of the projector (and preferably substantially in a vertical plane) to provide a line clear cut and precise and also to control one or more intermediate positions. The folder is then advantageously "masked" or "optically inactivated" when the cover is in the extreme optically active position: the folder enters into action only when the cover is in an intermediate position, and the folder becomes inactive ( optically) when the cover is in a passive / retracted position.

De cette façon, lorsque le cache se trouve dans une position active, le faisceau lumineux émis par le projecteur comprend les rayons lumineux qui sont dirigés au-dessus du cache. Le cache masque la plieuse, cela signifie que les rayons lumineux qui sont réfléchis par la plieuse sont interceptés par le cache, ou alors ils sont peu actifs, c'est à dire qu'ils sont mal focalisés relativement à la lentille 4. Lorsque le cache se trouve dans une position intermédiaire, la plieuse entre en action, et le faisceau lumineux est renforcé par les rayons qui sont renvoyés par la plieuse. L'intensité lumineuse du faisceau se trouve ainsi renforcée, conjointement avec le fait que la zone éclairée est plus étendue. Dans la position passive du cadre, la plieuse n'interfère pas avec le faisceau lumineux.In this way, when the cover is in an active position, the light beam emitted by the projector comprises the light rays which are directed above the cache. The mask hides the folder, it means that the light rays that are reflected by the folder are intercepted by the cover, or they are not very active, that is to say that they are poorly focused relative to the lens 4. When the cache is in an intermediate position, the folder enters into action, and the light beam is reinforced by the rays that are returned by the folder. The light intensity of the beam is thereby enhanced, together with the fact that the illuminated area is larger. In the passive position of the frame, the folder does not interfere with the light beam.

Les figures 2 à 5 illustrent un premier mode de mise en oeuvre de l'invention. Le cache 23 est un élément opaque. Il présente à son sommet une surface réfléchissante 25 orientée parallèlement à l'axe optique du projecteur qui forme la plieuse. La surface 25 est par exemple un film ou un revêtement réfléchissant de fine épaisseur qui est déposé au sommet d'un bloc qui forme le cache. La plieuse suit le chemin de la ligne de coupure, c'est à dire qu'elle présente pour le mode de réalisation illustré deux paliers 25a, 25b séparés par une pente de liaison 25c.The Figures 2 to 5 illustrate a first embodiment of the invention. The cache 23 is an opaque element. It has at its top a reflective surface 25 oriented parallel to the optical axis of the projector which forms the folder. The surface 25 is for example a film or a thin reflective coating which is deposited at the top of a block which forms the cover. The folder follows the path of the cutoff line, that is to say it has for the illustrated embodiment two bearings 25a, 25b separated by a connecting slope 25c.

Les figures 3 à 5 illustrent le fonctionnement du dispositif qui vient d'être décrit.The Figures 3 to 5 illustrate the operation of the device that has just been described.

Selon la figure 3, le cache 23 est mobile perpendiculairement à l'axe optique du projecteur, et il se trouve dans la position active où il intercepte une partie des rayons lumineux émis par la source lumineuse 22. La ligne de coupure du projecteur est centrée sur l'axe optique y-y du projecteur. Dans cette position du cache, la surface réfléchissante 25 est peu active, c'est à dire qu'elle intercepte peu de rayons lumineux car la surface réfléchissante 25 se trouve dans une partie de l'espace ou la concentration des rayons est moindre.According to figure 3 , the cover 23 is movable perpendicular to the optical axis of the projector, and it is in the active position where it intercepts a portion of the light rays emitted by the light source 22. The cutoff line of the projector is centered on the axis optical yy of the projector. In this position of the cover, the reflecting surface 25 is not very active, that is to say that it intercepts few light rays because the reflecting surface 25 is in a part of the space where the concentration of the rays is less.

Dans la figure 4, le cache 23 est descendu dans une position intermédiaire. D'une part le cache laisse le passage à une quantité plus importante de rayons lumineux ce qui augmente l'étendue de la zone éclairée par le projecteur. D'autre part, les rayons tels que le rayon 26b qui sont renvoyés par la plieuse, sont beaucoup plus nombreux que dans la position précédente car la concentration des rayons dans cette région de l'espace est maximale. Ces rayons renforcent l'intensité du faisceau lumineux émis par le projecteur. Ainsi, l'étendue plus grande de la zone éclairée est accompagnée par un faisceau lumineux d'intensité plus forte.In the figure 4 , the cover 23 is lowered into an intermediate position. On the one hand the cache leaves the passage to a larger amount of light rays which increases the extent of the area illuminated by the projector. On the other hand, the rays such as the radius 26b which are returned by the folder, are much more numerous than in the previous position because the concentration of the rays in this region of space is maximum. These rays enhance the intensity of the light beam emitted by the projector. Thus, the larger extent of the illuminated area is accompanied by a stronger intensity light beam.

Dans la figure 5, le cache est escamoté, et la plupart des rayons lumineux traversent la lentille 24 sans être interceptés ou déroutés par le cache et la plieuse qui est décalée par rapport au faisceau émis.In the figure 5 , the cover is retracted, and most of the light rays pass through the lens 24 without being intercepted or diverted by the cover and the folder which is offset with respect to the emitted beam.

En variante, une partie seulement du cache peut présenter un revêtement réfléchissant, en particulier un seul des paliers de la ligne de coupure pourrait être réfléchissant.Alternatively, only part of the cover may have a reflective coating, particularly only one of the bearings of the cutoff line could be reflective.

Les figures 6 à 9 illustrent un second mode de mise en oeuvre de l'invention.The Figures 6 to 9 illustrate a second embodiment of the invention.

Le cache 33 est également mobile perpendiculairement à l'axe optique y-y du projecteur, il présente une structure traditionnelle avec néanmoins un doigt transversal d'entraînement 33a qui est dirigé en direction de la source lumineuse et dont la fonction apparaîtra plus clairement dans la suite.The cover 33 is also movable perpendicular to the optical axis yy of the projector, it has a traditional structure with nevertheless a transverse drive finger 33a which is directed towards the light source and whose function will appear more clearly in the following.

La plieuse 35 est formée par une lame dont la surface supérieure réfléchissante est orientée parallèlement à l'axe optique du projecteur. La lame est montée pivotante autour d'un axe transversal 35a située vers l'une de ses extrémités. Elle est rappelée vers la partie supérieure du projecteur par tout moyen approprié, par exemple un ressort, en direction d'une butée 35b dans une position où sa surface supérieure se situe juste un peu sous le niveau de la ligne de coupure 36 du cache 33 dans sa position active. Dans cette position, le doigt 33a est surélevé par rapport à la surface supérieure du cache avec un jeu.The folder 35 is formed by a blade whose reflective upper surface is oriented parallel to the optical axis of the projector. The blade is pivotally mounted about a transverse axis 35a located towards one of its ends. It is returned to the upper part of the headlight by any appropriate means, for example a spring, towards a stop 35b in a position where its upper surface is just a little below the level of the cutoff line 36 of the cache 33 in its active position. In this position, the finger 33a is elevated relative to the upper surface of the cache with a clearance.

Le fonctionnement de ce dispositif est le suivant. Dans la position active du cache 33 représentée dans la figure 7, le cache est dans sa position active, et la plieuse en butée. Dans cette situation, le cache masque la plieuse, c'est à dire que des rayons tels que le rayon 38a sont réfléchis par la plieuse, mais interceptés ensuite par le cache.The operation of this device is as follows. In the active position of the cache 33 shown in the figure 7 , the cache is in its active position, and the brake in abutment. In this situation, the mask hides the folder, that is to say that rays such as the radius 38a are reflected by the folder, but then intercepted by the cache.

Dans la figure 8, le cache se trouve en position intermédiaire. Des rayons additionnels peuvent franchir le cache, et des rayons tels que le rayon 38a précédent également, ce qui augmente l'intensité du faisceau lumineux émis par le projecteur. Le doigt 33a vient au contact de la plieuse.In the figure 8 , the cache is in the intermediate position. Additional rays can cross the cover, and rays such as the previous beam 38a also, which increases the intensity of the light beam emitted by the projector. The finger 33a comes into contact with the folder.

Selon la figure 9, le cache est escamoté vers le bas, et dans son mouvement il a entraîné la plieuse à l'aide du doigt 33a, de façon que la plupart des rayons lumineux émis par la source 32 forment le faisceau sans être interceptés ou détournés par le cache ou la plieuse.According to figure 9 , the cover is retracted downwards, and in its movement it has driven the folder with the finger 33a, so that most of the light rays emitted by the source 32 form the beam without being intercepted or diverted by the cache or the folder.

En variante, la plieuse peut être une lame pliée en zigzag, de façon à suivre la ligne de coupure du cache. Selon une autre variante, une partie seulement de la longueur de la lame peut être réfléchissante de façon à former la plieuse.Alternatively, the folder may be a zigzag folded blade, so as to follow the cut line of the cache. According to another variant, only a part of the length of the blade can be reflective so as to form the folder.

Selon une autre variante, la lame est plus courte que la ligne de coupure et s'étend seulement le long d'une partie de la longueur de la ligne. Selon une autre variante, la lame est réfléchissante seulement sur une partie de sa longueur.According to another variant, the blade is shorter than the cut-off line and extends only along part of the length of the line. According to another variant, the blade is reflective only over part of its length.

Les figures 10 à 13 sont relatives à un autre mode de mise en oeuvre de l'invention, avec une plieuse fixe et un cache mobile.The Figures 10 to 13 are relative to another embodiment of the invention, with a fixed folder and a mobile cover.

Selon la figure 10a, le cache 43 présente une structure traditionnelle. La plieuse 45 est la surface supérieure réfléchissante d'un bloc 45a situé à proximité du cache, du côté de la source lumineuse. Le bloc 45a est translucide (transparent) c'est à dire qu'il peut être traversé par des rayons lumineux sans perturber de façon significative leur direction ou leur intensité. Le bloc est par exemple un bloc de verre de 2 à 10 mm, notamment de 2 à 4 millimètres d'épaisseur, et de préférence 3 ou 5 millimètres, dont la surface supérieure est aluminisée et il est placé de telle façon que la surface réfléchissante 45 se trouve à proximité immédiate de l'axe optique du projecteur, juste un peu sous la ligne de coupure du cache dans sa position active.According to figure 10a , the cache 43 has a traditional structure. The folder 45 is the reflective upper surface of a block 45a located near the cover on the side of the light source. Block 45a is translucent (transparent) that is to say that it can be crossed by light rays without significantly disturbing their direction or intensity. The block is for example a glass block 2 to 10 mm, in particular 2 to 4 millimeters thick, and preferably 3 or 5 millimeters, whose upper surface is aluminized and is placed in such a way that the reflecting surface 45 is in the immediate vicinity of the optical axis of the projector, just a little below the cutoff line of the cache in its active position.

Comme dans le cas précédent, la plieuse peut être mise en forme de façon à suivre le contour de la ligne de coupure du cache 43. Egalement, la plieuse peut couvrir une partie seulement de la longueur de la ligne de coupure.As in the previous case, the folder may be shaped so as to follow the contour of the cut line of the cover 43. Also, the folder may cover only part of the length of the cut line.

Selon une autre variante, une partie d'une des parois latérales du bloc transparent est rendue opaque, ou diffusante, notamment par métallisation locale ou par dépoli ou par association avec un élément occultant. On choisit de préférence, dans cette variante, d'opacifier plutôt le bloc dans sa partie inférieure : cette opération a pour but, éventuellement, de replacer un cache statique, parfois présent même pour faire des faisceaux route, afin de le délimiter nettement.According to another variant, a portion of one of the side walls of the transparent block is made opaque, or diffusing, in particular by local metallization or by frosting or by association with a blackout element. In this variant, it is preferable to opacify rather the block in its lower part: this operation aims, possibly, to replace a static cache, sometimes present even to make road beams, in order to delimit it clearly.

Le bloc transparent peut avoir des parois latérales parallèles entre elles, comme représenté en figure 10a : c'est son mode de réalisation le plus simple, tel que représenté aux figures. On peut ainsi avoir un bloc qui est simplement substantiellement sous la forme d'un parallélépipède. On peut aussi avoir un bloc dont au moins une de ses parois latérales est courbe. Dans ce cas là, on va modifier la forme de la paroi de façon à ce que le bloc transparent puisse jouer un rôle optique, à la manière d'une lentille, et notamment influencer la répartition photométrique du faisceau émis par le module.The transparent block may have side walls parallel to each other, as shown in FIG. figure 10a This is its simplest embodiment, as shown in the figures. One can thus have a block which is simply substantially in the form of a parallelepiped. One can also have a block of which at least one of its side walls is curved. In this case, we will change the shape of the wall so that the transparent block can play an optical role, in the manner of a lens, and in particular influence the photometric distribution of the beam emitted by the module.

Le bloc transparent peut avoir un bord supérieur plan : c'est son mode de réalisation le plus simple. Mais on peut aussi envisager qu'il soit courbe au moins localement, notamment selon la longueur. Là encore, c'est un paramètre sur lequel on peut jouer pour influencer sur la répartition photométrique du faisceau émis.The transparent block may have a flat top edge: this is its simplest embodiment. But we can also consider that it is curved at least locally, especially depending on the length. Again, it's a parameter which can be used to influence the photometric distribution of the emitted beam.

En variante, une au moins des faces avant et arrière du bloc translucide est inclinée par rapport à la verticale, (ou par rapport à un axe perpendiculaire à l'axe optique du module, en cas de légère inclinaison de l'axe optique par rapport à l'horizontale de part la correction réalisée sur le module une fois monté), notamment d'un angle d'au moins 5° et/ou d'au plus 25°, notamment compris entre 10 et 20° . Alternativement, l'une au moins des faces avant et arrière du bloc translucide est courbe, notamment au moins partiellement concave.As a variant, at least one of the front and rear faces of the translucent block is inclined relative to the vertical, (or relative to an axis perpendicular to the optical axis of the module, in the event of slight inclination of the optical axis relative to horizontally from the correction performed on the module once mounted), in particular at an angle of at least 5 ° and / or at most 25 °, in particular between 10 and 20 °. Alternatively, at least one of the front and rear faces of the translucent block is curved, in particular at least partially concave.

Selon un exemple, le bord inférieur du bloc translucide peut être plus mince que son bord supérieur.In one example, the lower edge of the translucent block may be thinner than its top edge.

Les figures 10b à 10d sont des représentations en coupe transversale de variantes du bloc inférieur.The Figures 10b to 10d are cross-sectional representations of variants of the lower block.

La figure 10b illustre une variante de la figure 10a en ce qui concerne le bloc 45 : la face avant 45b du bloc est inclinée vers l'avant (on comprend dans tout le texte par « avant » ou arrière » le positionnement de la surface considérée en fonction du cheminement de la lumière issue de la source vers la sortie du module optique) d'un angle α d'environ 17° par rapport à la verticale représentée par l'axe Δ (mesuré inversement au sens trigonométrique). Et la face arrière 45c du bloc est inclinée vers l'arrière d'un angle α' également d'environ 17° par rapport à la verticale (dans le sens trigonométrique). On a donc une configuration des faces du bloc symétrique par rapport à l'axe Δ, avec un bloc plus mince en partie inférieure. Les faces avant et arrière ainsi inclinées de façon à ce que le bloc ait un bord inférieur plus mince font jouer au bloc un rôle proche de celui d'une lentille. Concrètement, cette inclinaison particulière permet de dévier certains des rayons traversant le bloc de façon à améliorer la qualité/l'homogénéité du faisceau lumineux sortant du module. On a ainsi observé que, en utilisant un bloc aux faces parallèles entre elles et verticales, comme représenté à la figure 10a, on pouvait, dans le faisceau route, avoir l'apparition de rayons surmontant la tache lumineuse de concentration principale, appelée aussi « hot spot », ce qui peut apparaître comme inconfortable pour le conducteur. En inclinant les faces du bloc, comme représenté notamment à la figure 10b (effet similaire avec les variantes décrites plus loin au vu des figures 10c et 10d), de façon appropriée, on peut arriver à ce que ces rayons, formant une tache au dessus du « hot spot », soient déviés vers le bas, et fusionnent avec le « hot spo »t : on obtient alors un faisceau route plus homogène, plus agréable pour le conducteur.The figure 10b illustrates a variant of the figure 10a as regards the block 45: the front face 45b of the block is inclined towards the front (it is understood in all the text by "front" or rear "the positioning of the considered surface according to the path of the light from the source towards the output of the optical module) of an angle α of about 17 ° with respect to the vertical represented by the axis Δ (measured inversely in the trigonometrical direction). And the rear face 45c of the block is inclined backwards by an angle α 'also about 17 ° relative to the vertical (in the trigonometrical direction). We therefore have a configuration of the symmetrical block faces with respect to the Δ axis, with a thinner block at the bottom. The front and rear faces thus inclined so that the block has a thinner lower edge make the block play a role close to that of a lens. Concretely, this particular inclination allows to deflect some of the rays passing through the block so as to improve the quality / homogeneity of the light beam leaving the module. It has thus been observed that, by using a block with faces parallel to each other and vertical, as shown in FIG. figure 10a , in the beam of the road, it was possible to have the appearance of rays surmounting the luminous spot of principal concentration, also called "hot spot", which can appear as uncomfortable for the driver. By tilting the faces of the block, as shown in particular at figure 10b (similar effect with the variants described later in view of the Figures 10c and 10d ), it is possible that these rays, forming a spot above the "hot spot", are deflected downwards, and merge with the "hot spo" t: we then obtain a more homogeneous road beam , more enjoyable for the driver.

La figure 10c est une variante de la figure 10b : la face avant 45b du bloc est davantage inclinée vers l'avant que ne l'est la face arrière 45c vers l'arrière. On a ici un angle α d'environ 20° et un angle α' d'environ 5°. Il s'est avéré que c'est l'inclinaison de la face avant 45b du bloc qui est la plus efficace pour dévier les rayons de façon contrôlée, et la face arrière peut donc avoir une inclinaison moindre, ou même être simplement dans un plan vertical comme à la figure 10a.The figure 10c is a variant of the figure 10b : the front face 45b of the block is more inclined forward than the rear face 45c is backward. Here we have an angle α of about 20 ° and an angle α 'of about 5 °. It has been found that it is the inclination of the front face 45b of the block that is most effective for deflecting the spokes in a controlled manner, and the rear face can therefore have a smaller inclination, or even be simply in a plane. vertical as at the figure 10a .

La figure 10d est une autre variante du bloc 45 : on a toujours une base du bloc plus mince que son bord supérieur, mais les faces avant et arrière 45b et 45c sont cette fois courbes : elles sont toutes les deux concaves, d'une courbure de 35mm. De préférence, leur courbure est entre 20 et 50 mm, notamment entre 30 et 40 mm. On peut aussi prévoir que seule la face avant soit concave, et que la face arrière reste plane, dans un plan vertical, ou inclinée. La courbure appropriée de la face ou des faces du bloc permet de dévier de façon contrôlée les rayons, comme expliqué plus haut.The figure 10d is another variant of the block 45: there is always a base of the block thinner than its upper edge, but the front and rear faces 45b and 45c are curved this time: they are both concave, a curvature of 35mm. Preferably, their curvature is between 20 and 50 mm, in particular between 30 and 40 mm. It is also possible that only the front face is concave, and that the rear face remains flat, in a vertical plane, or inclined. The appropriate curvature of the face or faces of the block makes it possible to deviate the rays in a controlled manner, as explained above.

Les figures 11 à 13 illustrent le fonctionnement du dispositif. Dans la figure 11, le cache est en position active de coupure. Il masque la plieuse et il intercepte des rayons lumineux, et des rayons tels que le rayon 46a sont renvoyés par la plieuse 45 mais interceptés ensuite par le cache 43. Selon la figure 12, le cache est descendu dans une position intermédiaire, si bien qu'il intercepte moins de rayons, et que d'autre part des rayons tels que le rayon 46a précédent sont renvoyés par la plieuse au dessus de la ligne de coupure du cache. Ainsi, le faisceau lumineux émis par le projecteur présente une plus grande étendue, et il est aussi renforcé en intensité.The Figures 11 to 13 illustrate the operation of the device. In the figure 11 , the cache is in the active position of cutoff. It hides the folder and intercepts light rays, and rays such as the spoke 46a are returned by the folder 45 but then intercepted by the cover 43. According to the figure 12 , the cache is lowered to an intermediate position, so that it intercepts fewer rays, and that on the other hand rays such as the previous ray 46a are returned by the folder above the cutoff line of the cache. Thus, the light beam emitted by the projector has a greater extent, and it is also enhanced in intensity.

Dans la figure 13, le cache est escamoté, et le faisceau lumineux comprend l'ensemble des rayons lumineux émis par la source lumineuse. Certains rayons traversent le bloc 45a. Egalement la plieuse se trouve dans le champ du faisceau lumineux, mais elle ne laisse pas de trace visible du fait de sa fine épaisseur.In the figure 13 , the cover is retracted, and the light beam comprises all the light rays emitted by the light source. Some rays pass through block 45a. Also the folder is in the field of the light beam, but it leaves no visible trace because of its thin thickness.

Des variantes et d'autre modes de construction sont encore possibles.Variants and other modes of construction are still possible.

De ce qui vient d'être décrit, il ressort que le cache masque la plieuse lorsqu'il se trouve en position active. De plus, il est déplacé selon deux modes de déplacement distincts.From what has just been described, it appears that the mask hides the folder when it is in the active position. In addition, it is moved according to two distinct modes of displacement.

Un premier mode de déplacement consiste à déplacer le cache entre sa position active et une position intermédiaire où la plieuse entre en action. Il s'agit d'un déplacement de petite amplitude qui demande en outre une grande précision dans le positionnement du cache. Le cache peut aussi avoir plusieurs positions intermédiaires.A first mode of displacement is to move the cache between its active position and an intermediate position where the folder enters into action. This is a small amplitude displacement which also requires a high precision in the positioning of the cache. The cache can also have several intermediate positions.

Selon un deuxième mode de déplacement, le cache est amené dans sa position passive, depuis sa position active ou encore depuis sa position intermédiaire. Il s'agit d'un déplacement de grande amplitude. On estime l'amplitude du premier mode de déplacement à quelques dixièmes de millimètres, notamment 0,6 millimètre, et l'amplitude du second mode de déplacement à quelques millimètres, notamment 6 millimètres. Ces distances dépendent toutefois de la distance focale de la lentille.According to a second mode of movement, the cover is brought into its passive position, from its active position or from its intermediate position. It is a displacement of great amplitude. The amplitude of the first mode of displacement is estimated at a few tenths of millimeters, in particular 0.6 millimeters, and the amplitude of the second mode of displacement at a few millimeters, in particular 6 millimeters. These distances, however, depend on the focal length of the lens.

Différents moyens de déplacements du cache selon deux modes de déplacement distincts vont maintenant être décrits.Different means of movement of the cache according to two distinct modes of displacement will now be described.

Selon la figure 14, le déplacement du cache 3 est piloté par un moteur 55 et par l'intermédiaire d'un ensemble de transmission 56. Le moteur est de tout type approprié, par exemple c'est un moteur à courant continu, ou un moteur pas à pas. L'ensemble de transmission est par exemple un mécanisme à vis qui transforme la rotation de l'arbre du moteur en une translation.According to figure 14 , the movement of the cover 3 is controlled by a motor 55 and via a transmission assembly 56. The motor is of any suitable type, for example it is a DC motor, or a stepper motor . The transmission assembly is for example a screw mechanism which converts the rotation of the motor shaft into a translation.

Un autre mode de construction de l'ensemble de transmission est représenté en figure 15.Another way of constructing the transmission assembly is shown in FIG. figure 15 .

Il comprend un chariot 46 guidé verticalement. Le cache 53 avec sa ligne de coupure est monté solidairement sur le chariot. Le déplacement du chariot est piloté par une crémaillère 49a, 49b entraînée par des pignons 50a, 50b eux-mêmes entraînés par un pignon 51 de plus grand diamètre, les pignons étant solidaires en rotation. Tout moyen approprié convient pour piloter la rotation du pignon 51, et par exemple une roue dentée entraînée par un moteur pas à pas. De préférence, un ressort non représenté rappelle élastiquement le chariot dans la position active du cache qui correspond à la position réglementaire de feux de croisement. Ainsi, en cas d'incident de fonctionnement, le cache est rappelé par le ressort dans sa position active correspondant aux feux de croisement.It comprises a carriage 46 guided vertically. The cover 53 with its cutoff line is mounted integrally on the carriage. The movement of the carriage is controlled by a rack 49a, 49b driven by pinions 50a, 50b themselves driven by a pinion 51 of larger diameter, the pinions being secured in rotation. Any appropriate means is suitable for controlling the rotation of the pinion 51, and for example a toothed wheel driven by a stepping motor. Preferably, a spring not shown resiliently recalls the carriage in the active position of the cover which corresponds to the regulatory position of low beam. Thus, in case of an operating incident, the cover is returned by the spring in its active position corresponding to the dipped beam.

Selon le mode de construction schématisé en figure 16, deux organes de déplacement distincts pilotent le déplacement du cache 63. Le premier organe 64 est un électroaimant dont la course est sensiblement égale à la course du cache entre sa position active et sa position passive. L'électroaimant permet un déplacement rapide du cache entre ces deux positions. Le second élément 65 est un moteur, par exemple un moteur pas à pas, qui entraîne un mécanisme à vis qui transforme la rotation de l'arbre du moteur en une translation. Cet organe assure les déplacements de faible amplitude du cache entre une position active et une position intermédiaire.According to the schematized construction method figure 16 two different displacement members control the movement of the cover 63. The first member 64 is an electromagnet whose stroke is substantially equal to the race of the cover between its active position and its passive position. The electromagnet allows rapid movement of the cover between these two positions. The second element 65 is a motor, for example a stepper motor, which drives a screw mechanism that converts the rotation of the motor shaft into a translation. This member provides low amplitude movement of the cache between an active position and an intermediate position.

Dans le mode de construction représenté schématiquement en figure 17, l'organe de déplacement du cache 73 est une came 74 entraînée en rotation par un moteur 75. Un ressort 76 rappelle le cache pour qu'il soit au contact de la came. La figure 18 montre le chemin de came 74a en développé. Un premier segment 75 correspond à la position active du cache, qui correspond aux feux de croisement. Le segment suivant 76 a une faible pente, il assure un déplacement de faible amplitude du cache dans une ou plusieurs positions intermédiaires selon l'angle de rotation de la came.In the construction mode shown schematically in figure 17 , the displacement member of the cover 73 is a cam 74 driven in rotation by a motor 75. A spring 76 recalls the cover so that it is in contact with the cam. The figure 18 shows the cam path 74a in developed. A first segment 75 corresponds to the active position of the cache, which corresponds to the low beam. The following segment 76 has a low slope, it ensures a small amplitude displacement of the cache in one or more intermediate positions depending on the rotation angle of the cam.

Le segment suivant 77 est un segment de transition vers le palier 78 qui positionne le cache dans la position passive correspondant aux feux de route. Le segment 77 a une pente importante pour assurer un déplacement rapide du cache vers la position de feux de route.The next segment 77 is a transition segment to the bearing 78 which positions the cache in the passive position corresponding to high beam. The segment 77 has a steep slope to ensure rapid movement of the cache to the high beam position.

Selon la figure 19, le cache 83 est mobile en translation, il est relié solidairement à une colonne 82 qui est guidée dans deux bagues de guidage. La base de la colonne est en contact avec une came 86 de même nature que celle qui a été décrite précédemment.According to figure 19 , the cover 83 is movable in translation, it is integrally connected to a column 82 which is guided in two rings of guide. The base of the column is in contact with a cam 86 of the same nature as that described above.

Selon la figure 20, le cache 93 est prolongé latéralement par un montant 92 réalisé d'une seule pièce avec le cache. Le montant possède deux encoches longilignes 94, 95 dans l'alignement l'une de l'autre. Ces encoches sont traversées par des plots de guidage 96, 97, et le déplacement du cache et du montant est piloté par un doigt d'entraînement 98 qui est au contact de la came 99.According to figure 20 , the cover 93 is extended laterally by a post 92 made in one piece with the cover. The amount has two elongated slots 94, 95 in alignment with each other. These notches are traversed by guide pins 96, 97, and the displacement of the cover and the upright is controlled by a drive finger 98 which is in contact with the cam 99.

Les moyens de déplacement du cache sont pilotés par tout moyen approprié, automatique ou manuel. Par exemple, il s'agit d'un radar qui détecte la distance avec le véhicule suivi ou rencontré, ou tout autre dispositif.The means for moving the cache are controlled by any appropriate means, automatic or manual. For example, it is a radar that detects the distance with the vehicle tracked or encountered, or any other device.

Egalement, le pilotage du présent dispositif peut être réalisé en coordination avec un dispositif de correction qui ajuste le faisceau lumineux en fonction de l'assiette du véhicule, c'est à dire que des mêmes éléments optiques ou des mêmes éléments de pilotage peuvent être utilisés pour améliorer la portée du projecteur, conformément à l'invention, ou pour réaliser une correction de faisceau en relation avec l'assiette du véhicule.Also, the control of the present device can be achieved in coordination with a correction device which adjusts the light beam according to the attitude of the vehicle, that is to say that the same optical elements or the same control elements can be used to improve the range of the projector according to the invention, or to achieve a beam correction in relation to the attitude of the vehicle.

Naturellement la présente description n'est donnée qu'à titre indicatif, et l'on pourrait adopter d'autres mises en oeuvre de l'invention sans pour autant sortir du cadre de celle-ci.Naturally the present description is given only as an indication, and one could adopt other implementations of the invention without departing from the scope thereof.

En particulier, le module peut être utilisé aussi bien pour les fonctions d'éclairage réglementaires que pour les fonctions AFS qui ont été mentionnées au début de la description et d'une manière générale pour toute fonction d'éclairage ou de signalisation que le projecteur est susceptible de remplir.In particular, the module can be used both for the regulatory lighting functions and for the AFS functions that have been mentioned at the beginning of the description and generally for any lighting or signaling function that the projector is likely to fill.

Egalement, le présent module peut être couplé avec un dispositif de commutation automatique d'un type de faisceau à un autre, comme par exemple celui qui est décrit dans la demande de brevet FR2877892 .Also, this module can be coupled with an automatic switching device from one type of beam to another, such as for example that described in the patent application. FR2877892 .

Claims (22)

  1. Optical module for a motor vehicle lighting device comprising:
    - a reflector (1) defining an optical axis (y-y),
    - a dioptric element (4),
    - a light source (22, 32) disposed between the reflector and the dioptric element,
    - a cover (3, 23, 33, 43, 63, 73, 83, 93), the said cover being movable and having
    - at least one optically active position, in particular two, in which the cover intercepts some of the light rays emitted by the light source or reflected by the reflector, including an extreme position and an optional intermediate position,
    - and at least one position in which the cover is retracted,
    - a movement member (46, 64, 65, 74, 86, 99) able to control the position of the cover,
    - a bender (25, 35, 45) able to intercept some of the light rays and to return them above the cover in at least one optically active position of the cover,
    the cover (3, 23, 33, 43, 63, 73, 83, 93) being movable, in particular in a direction substantially perpendicular to the optical axis (y-y) of the headlight and being able to make the bender ineffective optically when it is situated in an extreme optically active position,
    - the cover (23) presenting a reflective surface (25) extending along at least part of the cut-off line,
    - the bender (35) is a reflective plate mounted so as to pivot around a transverse axis (35a), or
    - the bender (45) is the top surface of a translucent block (45a) that is made reflective,
    That is:
    - either the cover can intercept the rays reflected by the bender;
    - and/or the configuration of cover and bender is such that the rays reflected by the bender and not intercepted by the cover make a negligible contribution to the constitution of the beam emitted by the module.
  2. Module according to the preceding claim, characterised in that the extreme optically active position of the cover corresponds to the emission of a dipped beam by the module.
  3. Module according to one of the preceding claims, characterised in that the intermediate optically active position of the cover corresponds to the emission of a motorway beam by the module.
  4. Module according to one of the preceding claims, characterised in that the retracted position of the cover corresponds to the emission of a main beam by the module.
  5. Module according to one of the preceding claims, characterised in that the cover and bender are mounted secured to each other, form an integral part of the same element, or are independent components.
  6. Module according to one of the preceding claims, characterised by the fact that the reflective surface of the cover covers only part of the length of the cutoff line.
  7. Module according to one of claims 1 to 5, characterised by the fact that the bender (35) is the reflective plate that is mounted so as to pivot about a transverse axis (35a) and by the fact that the cover (33) has a finger (33a) driving the plate (35).
  8. Module according to claim 7, characterised by the fact that the plate extends along only part of the length of the cutoff line.
  9. Module according to claim 7 or 8, characterised by the fact that the plate (35) is reflective over only part of its length.
  10. Module according to one of claims 1 to 5, characterised by the fact that the bender (45) is the top surface of a translucent block (45a), in particular situated close to the cover (43), which is made reflective by being covered with a reflective coating.
  11. Module according to claim 10, characterised in that at least one of the front (45b) and rear (45c) faces of the translucent block (45a) is inclined with respect to the vertical, in particular by an angle (α, α') of at least 5° and/or no more than 25°, in particular between 10° and 20°.
  12. Module according to claim 10, characterised in that at least one of the front (45b) and rear (45c) faces of the translucent block (45b) is curved, and in particular at least partially concave.
  13. Module according to one of the preceding claims 10 to 12, characterised in that the bottom edge of the translucent block (45a) is thinner than its top edge.
  14. Module according to one of claims 10 to 13, characterised by the fact that the reflective coating extends over only part of the top surface of the translucent block.
  15. Module according to one of the preceding claims, characterised by the fact that the member moving the cover (3) is a motor (55) that drives a screw mechanism (56).
  16. Module according to one of the preceding claims, characterised by the fact that the member moving the shield comprises two distinct elements (64, 65).
  17. Module according to claim 15 or 16, characterised by the fact that the movement member comprises a solenoid (64) and a motor that drives a screw mechanism that converts the rotation of the motor shaft into a translation (65).
  18. Module according to one of the preceding claims, characterised by the fact that the member moving the shield is a cam (74, 86, 99) driven in rotation by a motor.
  19. Module according to the preceding claim, characterised by the fact that, in diagrammatic form, the cam track comprises a first segment (75) corresponding to the active position of the cover, a following segment (76) with a slight slope providing a low-amplitude movement of the cover in one or more intermediate positions according to the rotation angle of the cam, and a transition segment (77) to a step (78) that corresponds to the passive position of the cover.
  20. Module according to one of the preceding claims, characterised by the fact that the movement of the cover is controlled by a device for detecting distance to a vehicle being followed or met.
  21. Module according to any one of the preceding claims, characterised by the fact that the movement of the cover is coordinated with a correction device that adjusts the light beam according to the attitude of the vehicle.
  22. Headlight for a motor vehicle, characterised by the fact that it comprises an optical module according to any one of the preceding claims.
EP08157969A 2007-06-18 2008-06-10 Vehicle headlamp Not-in-force EP2006605B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0704333A FR2917485B1 (en) 2007-06-18 2007-06-18 OPTICAL MODULE FOR AUTOMOTIVE LIGHTING DEVICE

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EP2006605A1 EP2006605A1 (en) 2008-12-24
EP2006605B1 true EP2006605B1 (en) 2011-04-27

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EP08157969A Not-in-force EP2006605B1 (en) 2007-06-18 2008-06-10 Vehicle headlamp

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AT (1) ATE507435T1 (en)
DE (1) DE602008006489D1 (en)
FR (1) FR2917485B1 (en)

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FR2917485A1 (en) 2008-12-19
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ATE507435T1 (en) 2011-05-15
DE602008006489D1 (en) 2011-06-09
EP2006605A1 (en) 2008-12-24

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