EP1746340A2 - Optical module for a motor vehicle lighting device - Google Patents
Optical module for a motor vehicle lighting device Download PDFInfo
- Publication number
- EP1746340A2 EP1746340A2 EP06291099A EP06291099A EP1746340A2 EP 1746340 A2 EP1746340 A2 EP 1746340A2 EP 06291099 A EP06291099 A EP 06291099A EP 06291099 A EP06291099 A EP 06291099A EP 1746340 A2 EP1746340 A2 EP 1746340A2
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- EP
- European Patent Office
- Prior art keywords
- module
- optical element
- reflector
- cache
- additional optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
- F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
- F21S41/337—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector having a structured surface, e.g. with facets or corrugations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/60—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
Definitions
- 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.
- 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.
- the patent FR 2 754 039 which describes modules able to emit crossover beams or anti fog for example.
- the cache is fixed or mobile, and whatever the type of cut that it defines in the beam, it remains that all the luminous flux which is intercepted by the cache is lost, and the light output, that is to say the ratio between the light emitted by the lamp and that returned at the output of the optical module, is not very satisfactory.
- the object of the invention is therefore the development of a cache optical module of the type described above, in particular of the elliptical type, which has improved optical performance.
- it is a question of being able to increase the luminous efficiency of this type of module, without deteriorating the regulatory photometric characteristics of the cut-off beams obtained.
- the invention aims to achieve this goal without disrupting the design of current optical modules.
- an additional optical element is disposed between the light source and the cover, said additional optical element being in the vicinity of the optically active edge of the cover and having at least one reflective surface capable of redirecting above the optically active edge of the spoke cover. light emitted by the source towards said cache.
- At least one point of the additional optical element is located between the focus of the dioptric element of the convergent lens type and the reflector: this additional optical element is at least partly, in particular completely, disposed between the source and the cache , or between the reflector and the cover.
- source-light rays means the rays directly emitted by the source and the rays indirectly emitted by the source, namely the rays emitted by the source and then reflected, in particular at least one times by the wall of the reflector in which the light source is located.
- the optical module is of elliptical module type: the source is placed at a first rear focus of the reflector, or in the vicinity thereof, and the dioptric element is placed at the internal focus of the reflector or in the vicinity thereof .
- the reflector is then shaped close to an ellipsoid.
- the additional optical element can be integral or even integral part of the cache. It is possible to mount the optical element on the cover or the support of the cover by any known fastening means, in particular by clipping, crimping, welding, gluing, overmolding. We can also make the cache (or its support) and this optical element one piece.
- the reflecting surface of the additional optical element preferably has an upwardly facing face, the leading edge of which substantially follows, at least locally, the profile of the optically active edge of the mask. This means that the front edge of the element substantially adopts the shape of the edge of the cache. Indeed, this choice has been judicious to minimize the risk of creating blur in the beam emitted by the module in the vicinity of the cut.
- 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.
- One embodiment is that the front edge of the additional optical element is attached to the optically active edge of the cache.
- the reflecting surface of the additional optical element has an upwardly facing face and is preferably disposed adjacent to only the central portion of the cover.
- the reflective surface of the additional optical element has an upwardly facing face and has a notch at its rear edge.
- the indentation can actually delimit two side zones that extend rearward to further enhance the recovery of light by coming "surround” the lamp (of course respecting a sufficient distance with the lamp).
- the front edge of the face in question preferably comprises a broken line, namely a succession of line segments, without excluding possibly also curve portions.
- This front edge is substantially preferably a generator for the shape of the upwardly facing face mentioned above. is then composed, for example, a succession of inclined planes relative to each other substantially aligned along the optical axis of the module.
- the rear edge of the face in question preferably has a profile similar to, or identical to that of the front edge. It can also have a different profile, curve for example.
- This face is preferably disposed in a substantially horizontal plane and transversely to the optical axis of the reflector, as may be the case of the cache as well.
- Its width is then understood by its dimension measured parallel to the optical axis, and its length perpendicular to it. In this case, its width (its smallest dimension) is at least 8 times, in particular at least 10 times smaller than its length (its largest dimension).
- Its thickness is low.
- the additional optical element may be in the form of a plate of 2 to 6 mm, in particular 3 to 4 mm wide, and 35 to 60, in particular 40 to 50 mm long. And its thickness can be from 0.2 to 1.5 or 2 mm.
- this face is curved along its length / largest dimension, with for example an arrow in the center of the order of 0.5 to 4 mm, especially 1 to 2 mm .
- the curved shape (upwards) is advantageous for contributing to ensuring good linearity of the cutoff of the light beam. It can help to compensate for any optical defects inherent in the reflector or the dioptric element.
- the reflecting surface of the additional optical element has an upwardly facing face which is smooth. According to another embodiment, it comprises, at least locally, streaks and / or corrugations. These surface modifications give an additional possibility of controlling the distribution of the rays recovered in the beam emitted by the module: they make it possible in particular to spread the beam. They can be distributed over the entire reflecting surface, including the lateral areas mentioned above.
- the ridges and / or undulations are preferably substantially oriented parallel to the optical axis of the module.
- the striations and / or undulations can be of evolutionary form, especially when the upwardly facing face referenced above is flat. It is understood by evolutionary streak, a streak whose starting profile and the arrival profile are different.
- the front profile begins at the optically active edge of the cover (which is generally straight), and the back profile is a radius or ripple.
- corrugation steps of about 0.5 to 1.5 mm and arrows of 0.2 to 1 mm may be provided.
- the cover can be a mobile cover for making a bi-function or multi-function projector, including a bi-function module code / route or a multifunction module.
- the optical module according to the invention can emit at least one type of cut-off beam among those described at the beginning of this text.
- the invention also relates to a motor vehicle headlamp equipped with at least one optical module as described above.
- the r2 rays reaches the reflecting face of the optical element EP and will be deflected in the form of a radius r2 'upwards, above the screen: by folding so up at least a portion of the rays that would otherwise be intercepted by the screen, the light output of the module is significantly improved.
- the invention makes it possible to add luminous flux in the central part of the beam: by adding the "corrugated folder" according to FIG. 3b, as an indication, one passes from a total flow of about 712 lumens at a total flux of about 870 lumens, and from a maximum of about 46 lux to a maximum of about 72 lux.
- the positive effect of the folder is present regardless of the form of the cut (code, motorway ..) and it can adapt whatever the shape of the screen (which can be mono or multi component).
- the invention can be applied mutadis mutandis to elliptical modules having a cache that is movable: in this case it is necessary to provide a motor for actuating, preferably integrally, the cache and the folder.
- the folder can also be detached from the cache.
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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
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. Pour plus de détails sur les modules à cache mobile, on peut notamment se reporter aux brevets
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 Front 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 ; II s'agit notamment
- de la fonction dite BL (Bending Light en anglais pour lumière virage), 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 feu d'autoroute. Cette fonction assure une augmentation de la portée d'un feu de croisement ;
- de la fonction dite Overhead Light en anglais, pour feu surélevé. Cette fonction assure une modification d'un faisceau de feu de croisement de telle sorte que des portiques situés en hauteur sont éclairés de façon satisfaisante au moyen des feux 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.
- the function called BL (Bending Light in English for light bend), 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 highway lights. This function ensures an increase in the range of a dipped beam;
- of the function called Overhead Light in English, for raised fire. This function ensures a modification of a beam of low beam so that gantries located at height are illuminated satisfactorily by means of 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.
Que le cache soit fixe ou qu'il soit mobile, et quel que soit le type de coupure qu'il définit dans le faisceau, il demeure que tout le flux lumineux qui se trouve intercepté par le cache est perdu, et que le rendement lumineux, c'est-à-dire le rapport entre la lumière émise par la lampe et celle restituée en sortie du module optique, n'est donc pas très satisfaisant.Whether the cache is fixed or mobile, and whatever the type of cut that it defines in the beam, it remains that all the luminous flux which is intercepted by the cache is lost, and the light output, that is to say the ratio between the light emitted by the lamp and that returned at the output of the optical module, is not very satisfactory.
L'invention a alors pour but la mise au point d'un module optique à cache du type décrit plus haut, notamment du type elliptique, qui présente des performances optiques améliorées. Il s'agit, notamment, de pouvoir augmenter le rendement lumineux de ce type de module, sans détériorer les caractéristiques photométriques réglementaires des faisceaux à coupure obtenus. Accessoirement, l'invention a pour but d'atteindre cet objectif sans bouleverser la conception des modules optiques actuels.The object of the invention is therefore the development of a cache optical module of the type described above, in particular of the elliptical type, which has improved optical performance. In particular, it is a question of being able to increase the luminous efficiency of this type of module, without deteriorating the regulatory photometric characteristics of the cut-off beams obtained. Incidentally, the invention aims to achieve this goal without disrupting the design of current optical modules.
L'invention a tout d'abord comme objet un module optique, notamment un module elliptique, pour dispositif d'éclairage pour véhicule automobile, apte à émettre au moins un type de faisceau lumineux présentant une coupure et comportant :
- une source lumineuse disposée dans un réflecteur,
- un élément dioptrique, notamment une lentille convergente, disposé à l'avant du réflecteur,
- un cache disposé entre ladite source lumineuse et ledit élément dioptrique et présentant au moins une position optiquement active où il intercepte une partie des rayons lumineux émis par la source, le bord optiquement actif du cache étant propre à former une coupure dans le faisceau émis par le module,
- a light source arranged in a reflector,
- a dioptric element, in particular a convergent lens, arranged at the front of the reflector,
- a cover disposed between said light source and said dioptric element and having at least one optically active position where it intercepts a part of the light rays emitted by the source, the optically active edge of the cover being able to form a cut in the beam emitted by the module,
En outre, un élément optique additionnel est disposé entre la source lumineuse et le cache, ledit élément optique additionnel étant au voisinage du bord optiquement actif du cache et présentant au moins une surface réfléchissante apte à rediriger au dessus du bord optiquement actif du cache des rayons lumineux émis par la source en direction dudit cache.In addition, an additional optical element is disposed between the light source and the cover, said additional optical element being in the vicinity of the optically active edge of the cover and having at least one reflective surface capable of redirecting above the optically active edge of the spoke cover. light emitted by the source towards said cache.
Avantageusement, au moins un point de l'élément optique additionnel est situé entre le foyer de l'élément dioptrique du type lentille convergente et le réflecteur : cet élément optique additionnel est au moins en partie, notamment complètement, disposé entre la source et le cache, ou encore entre le réflecteur et le cache.Advantageously, at least one point of the additional optical element is located between the focus of the dioptric element of the convergent lens type and the reflector: this additional optical element is at least partly, in particular completely, disposed between the source and the cache , or between the reflector and the cover.
Dans le cadre du présent texte, on comprend par « rayons lumineux émis par la source », les rayons directement émis par la source et les rayons indirectement émis par la source, à savoir les rayons émis par la source puis réfléchis, notamment au moins une fois par la paroi du réflecteur dans lequel se trouve la source lumineuse.For the purposes of this text, "source-light rays" means the rays directly emitted by the source and the rays indirectly emitted by the source, namely the rays emitted by the source and then reflected, in particular at least one times by the wall of the reflector in which the light source is located.
L'élément optique additionnel a donc pour fonction de récupérer un partie au moins du flux lumineux qui, sinon, serait intercepté par le cache et donc perdu/gaspillé. Sa conception est ensuite choisie de façon à ce qu'il puisse « replier vers le haut » les rayons avant qu'ils n'arrivent sur le cache, de préférence d'une façon appropriée pour que ces rayons participent efficacement à l'obtention de la photométrie du faisceau lumineux à coupure voulu. Cette augmentation dans le rendement lumineux du module peut être mis à profit de différentes manières :
- on peut viser des performances optiques similaires avec des sources lumineuses moins puissantes et/ou des réflecteurs moins complexes,
- on peut aussi viser des performances optiques globalement meilleures, toutes choses égales par ailleurs, le gain de lumière étant utilisé pour obtenir des faisceaux globalement plus puissants et éventuellement présentant une distribution améliorée.
- it is possible to aim at similar optical performances with less powerful light sources and / or less complex reflectors,
- one can also aim for overall better optical performance, all things being equal, the light gain being used to obtain beams that are generally more powerful and possibly having an improved distribution.
Avantageusement, le module optique est de type module elliptique : la source est placée à un premier foyer arrière du réflecteur, ou au voisinage de celui-ci, et l'élément dioptrique est placé au foyer interne du réflecteur ou au voisinage de celui-ci. Le réflecteur est alors de forme proche d'un ellipsoïde.Advantageously, the optical module is of elliptical module type: the source is placed at a first rear focus of the reflector, or in the vicinity thereof, and the dioptric element is placed at the internal focus of the reflector or in the vicinity thereof . The reflector is then shaped close to an ellipsoid.
L'élément optique additionnel peut être solidaire ou même fait partie intégrante du cache. On peut prévoir de monter l'élément optique sur le cache ou le support du cache par tous moyens de fixation connus, notamment par clippage, sertissage, soudure, collage, surmoulage. On peut aussi faire du cache (ou de son support) et de cet élément optique une seule pièce.The additional optical element can be integral or even integral part of the cache. It is possible to mount the optical element on the cover or the support of the cover by any known fastening means, in particular by clipping, crimping, welding, gluing, overmolding. We can also make the cache (or its support) and this optical element one piece.
La surface réfléchissante de l'élément optique additionnel comporte de préférence une face tournée vers le haut dont le bord avant suit substantiellement, au moins localement, le profil du bord optiquement actif du cache. On entend par cela que le bord avant de l'élément adopte substantiellement la forme du bord du cache. En effet, ce choix s'est avéré judicieux pour minimiser les risques de création de flou dans le faisceau émis par le module au voisinage de la coupure.The reflecting surface of the additional optical element preferably has an upwardly facing face, the leading edge of which substantially follows, at least locally, the profile of the optically active edge of the mask. This means that the front edge of the element substantially adopts the shape of the edge of the cache. Indeed, this choice has been judicious to minimize the risk of creating blur in the beam emitted by the module in the vicinity of the cut.
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.
Un mode de réalisation consiste en ce que le bord avant de l'élément optique additionnel soit accolé au bord optiquement actif du cache.One embodiment is that the front edge of the additional optical element is attached to the optically active edge of the cache.
La surface réfléchissante de l'élément optique additionnel comporte une face tournée vers le haut et qui est de préférence disposée au voisinage de la partie centrale seulement du cache. Cette configuration permet en effet de récupérer des rayons lumineux dans la zone du cache recevant le flux lumineux le plus élevé : avec une économie de moyens remarquable (élément ajouté de taille réduite), on obtient donc déjà une augmentation de rendement lumineux substantiel.The reflecting surface of the additional optical element has an upwardly facing face and is preferably disposed adjacent to only the central portion of the cover. This configuration makes it possible to recover light rays in the area of the cache receiving the highest luminous flux: with a remarkable economy of means (added element of reduced size), we thus already obtain a substantial increase in luminous efficiency.
La surface réfléchissante de l'élément optique additionnel comporte une face tournée vers le haut et munie d'une échancrure au niveau de son bord arrière. L'échancrure peut délimiter en fait deux zones latérales qui se prolongent vers l'arrière pour améliorer encore la récupération de lumière en venant « entourer » la lampe (en respectant bien sûr un distance suffisante avec la lampe).The reflective surface of the additional optical element has an upwardly facing face and has a notch at its rear edge. The indentation can actually delimit two side zones that extend rearward to further enhance the recovery of light by coming "surround" the lamp (of course respecting a sufficient distance with the lamp).
Le bord avant de la face en question comporte de préférence une ligne brisée, à savoir une succession de segments de droites, sans exclure des portions de courbe éventuellement aussi.The front edge of the face in question preferably comprises a broken line, namely a succession of line segments, without excluding possibly also curve portions.
Ce bord avant sert substantiellement, de préférence, de génératrice pour la forme de la face tournée vers le haut mentionnée plus haut : elle se trouve alors composée, par exemple, d'une succession de plans inclinés les uns par rapport aux autres alignés sensiblement selon l'axe optique du module.This front edge is substantially preferably a generator for the shape of the upwardly facing face mentioned above. is then composed, for example, a succession of inclined planes relative to each other substantially aligned along the optical axis of the module.
Le bord arrière de la face en question a de préférence un profil voisin, ou identique à celui du bord avant. Il peut aussi avoir un profil différent, courbe par exemple.The rear edge of the face in question preferably has a profile similar to, or identical to that of the front edge. It can also have a different profile, curve for example.
C'est notamment le cas quand la face tournée vers le haut comportant une surface gauche.This is particularly the case when the face facing upwards has a left surface.
Cette face est de préférence disposée dans un plan sensiblement horizontal et transversalement à l'axe optique du réflecteur, comme cela peut être le cas du cache aussi. Sa largeur se comprend alors par sa dimension mesurée parallèlement à l'axe optique, et sa longueur perpendiculairement à celui-ci. Dans ce cas, sa largeur (sa plus petite dimension) est au moins 8 fois, notamment au moins 10 fois inférieure à sa longueur (sa plus grande dimension). Son épaisseur est faible. Par exemple, l'élément optique additionnel peut se présenter sous la forme d'une plaque de 2 à 6 mm, notamment 3 à 4 mm, de large, et de 35 à 60, notamment 40 à 50 mm de long. Et son épaisseur peut faire de 0.2 à 1.5 ou 2 mm.This face is preferably disposed in a substantially horizontal plane and transversely to the optical axis of the reflector, as may be the case of the cache as well. Its width is then understood by its dimension measured parallel to the optical axis, and its length perpendicular to it. In this case, its width (its smallest dimension) is at least 8 times, in particular at least 10 times smaller than its length (its largest dimension). Its thickness is low. For example, the additional optical element may be in the form of a plate of 2 to 6 mm, in particular 3 to 4 mm wide, and 35 to 60, in particular 40 to 50 mm long. And its thickness can be from 0.2 to 1.5 or 2 mm.
Avantageusement, et notamment dans la configuration gauche mentionnée plus haut, cette face est bombée suivant sa longueur/sa plus grande dimension, avec par exemple une flèche au centre de l'ordre de 0,5 à 4 mm, notamment de 1 à 2 mm. La forme bombée (vers le haut) est avantageuse pour contribuer à assurer une bonne linéarité de la coupure du faisceau lumineux. Elle peut contribuer à compenser d'éventuels défauts optiques inhérents au réflecteur ou à l'élément dioptrique.Advantageously, and particularly in the left configuration mentioned above, this face is curved along its length / largest dimension, with for example an arrow in the center of the order of 0.5 to 4 mm, especially 1 to 2 mm . The curved shape (upwards) is advantageous for contributing to ensuring good linearity of the cutoff of the light beam. It can help to compensate for any optical defects inherent in the reflector or the dioptric element.
Selon un mode de réalisation, la surface réfléchissante de l'élément optique additionnel comporte une face tournée vers le haut qui est lisse. Selon un autre mode de réalisation, elle comporte, au moins localement, des stries et/ou des ondulations. Ces modifications de surface donnent une possibilité supplémentaire de contrôle de la répartition des rayons récupérés dans le faisceau émis par le module : elles permettent notamment d'étaler le faisceau. Elles peuvent être réparties sur toute la surface réfléchissante, y compris les zones latérales évoquées plus haut.According to one embodiment, the reflecting surface of the additional optical element has an upwardly facing face which is smooth. According to another embodiment, it comprises, at least locally, streaks and / or corrugations. These surface modifications give an additional possibility of controlling the distribution of the rays recovered in the beam emitted by the module: they make it possible in particular to spread the beam. They can be distributed over the entire reflecting surface, including the lateral areas mentioned above.
Les stries et/ou ondulations sont de préférence substantiellement orientées parallèlement à l'axe optique du module. Les stries et/ou ondulations peuvent être de forme évolutive, tout particulièrement quand la face tournée vers le haut référencée plus haut est plane. On comprend par strie évolutive, une strie dont le profil de départ et le profil d'arrivée sont différents. Le profil avant commence au niveau du bord optiquement actif du cache (qui est généralement rectiligne), et le profil arrière est un rayon ou ondulation. On peut prévoir par exemple des pas d'ondulations d'environ 0,5 à 1,5 mm, et des flèches de 0.2 à 1 mm.The ridges and / or undulations are preferably substantially oriented parallel to the optical axis of the module. The striations and / or undulations can be of evolutionary form, especially when the upwardly facing face referenced above is flat. It is understood by evolutionary streak, a streak whose starting profile and the arrival profile are different. The front profile begins at the optically active edge of the cover (which is generally straight), and the back profile is a radius or ripple. For example, corrugation steps of about 0.5 to 1.5 mm and arrows of 0.2 to 1 mm may be provided.
Selon une variante, le réflecteur est tronqué dans sa partie inférieure :
- on se permet ainsi d'avoir un réflecteur de moindre taille, permettant d'avoir un module optique plus compact sans être significativement pénalisé sur le plan optique par le gain en rendement obtenu avec l'élément optique
- additionnel selon l'invention.
- it is thus possible to have a smaller reflector, to have a more compact optical module without being significantly penalized optically by the gain in performance obtained with the optical element
- additional according to the invention.
Le cache peut être un cache mobile permettant de réaliser un projecteur bi fonction ou multi fonction, notamment un module bi fonction code/route ou un module multifonction.The cover can be a mobile cover for making a bi-function or multi-function projector, including a bi-function module code / route or a multifunction module.
Le module optique selon l'invention peut émettre au moins un type de faisceau à coupure parmi ceux décrits au début du présent texte.The optical module according to the invention can emit at least one type of cut-off beam among those described at the beginning of this text.
L'invention concerne aussi un projecteur de véhicule automobile équipé d'au moins un module optique tel que décrit plus haut.The invention also relates to a motor vehicle headlamp equipped with at least one optical module as described above.
L'invention va être détaillée ci-après à l'aide d'un exemple non limitatif illustré par les figures suivantes :
- Figure 1 : une vue en section selon un plan vertical d'un module optique selon l'invention
- Figure 2 : une vue en perspective du module selon la figure 1
- Figure 3a, 3b,3c : 3 variantes de la plieuse appartenant au module optique selon les figures précédentes
- Figure 4a, 4b,4c : 3 vues simplifiées de réseaux de courbes isolux de faisceaux lumineux émis par le module optique selon l'invention, illustrant l'apport de l'élément optique selon la variante de la figure 3b.
- FIG. 1: a sectional view along a vertical plane of an optical module according to the invention
- FIG. 2: a perspective view of the module according to FIG. 1
- 3a, 3b, 3c: 3 variants of the folding machine belonging to the optical module according to the preceding figures
- Figure 4a, 4b, 4c: 3 simplified views of isolux curves networks light beam emitted by the optical module according to the invention, illustrating the contribution of the optical element according to the variant of Figure 3b.
Les éléments apparaissant sur différentes figures conservent les mêmes références.The elements appearing in different figures retain the same references.
Les figures 1 et 2 montrent les différents éléments principaux constituant le module optique M selon l'invention. Ce dernier comporte :
- un réflecteur R dont la forme géométrique de la paroi réfléchissante tournée vers l'avant est proche d'un demi ellipsoïde. La figure représente un réflecteur tronqué dans sa partie inférieure. Une alternative est d'utiliser un réflecteur « complet », dont sa forme serait proche d'un ellipsoïde complet.
- une source lumineuse S non représentée, disposée au fond du réflecteur R de façon connue. Il peut s'agir d'une lampe halogène, d'une lampe xénon, ou d'une ou plusieurs diodes électroluminescentes. Par exemple, il s'agit d'une lampe halogène, qui se trouve au foyer interne du réflecteur
- une lentille convergente L (qui peut être de type Fresnel), qui se trouve au second foyer du réflecteur.
- un cache C fixe, dont le bord optiquement actif BO est l'arrête du cache dans sa partie supérieure. Ce bord est ici choisi pour délimiter un faisceau de type code, avec une coupure oblique à 15° conforme aux réglementations européennes.
- un élément optique additionnel EO est disposé entre le réflecteur R et le cache C. C'est un élément sous forme d'une plaque dont le bord avant Bav est accolé au bord optiquement actif du cache, et qui est sensiblement plan (avec différentes variantes décrites plus loin) : il présente une face tournée vers le haut qui est réfléchissante. Cet élément est fixé mécaniquement au cache, ou peut en faire partie intégrante. Le cache et l'élément optique sont tous deux en métal. Ils peuvent aussi être en matériau à base de polymère sous réserve qu'il soit choisi suffisamment résistant à la chaleur et qu'on puisse métalliser l'élément optique sur une de ses faces au moins pour le rendre réfléchissant. On appellera également cet élément par le terme de « plieuse » dans tout le présent texte.
- a reflector R whose geometric shape of the reflecting wall facing towards the front is close to a half ellipsoid. The figure shows a truncated reflector in its lower part. An alternative is to use a "complete" reflector, whose shape would be close to a complete ellipsoid.
- a light source S not shown, arranged at the bottom of the reflector R in a known manner. It may be a halogen lamp, a xenon lamp, or one or more light-emitting diodes. For example, it is a halogen lamp, which is located at the internal focus of the reflector
- a convergent lens L (which may be of Fresnel type), which is at the second focus of the reflector.
- a fixed C cache, whose optically active edge BO is the edge of the cache in its upper part. This edge is chosen here to delimit a code-type beam, with an oblique cut at 15 ° in accordance with European regulations.
- an additional optical element EO is disposed between the reflector R and the cover C. It is a plate-like element whose front edge Bav is attached to the optically active edge of the cover, and which is substantially plane (with different variants described later): it has an upwardly facing side which is reflective. This element is mechanically fixed to the cache, or can be an integral part of it. The cover and the optical element are both metal. They may also be made of polymer-based material provided that it is chosen to be sufficiently heat-resistant and that the optical element can be metallized on one of its faces at least to make it reflective. This element will also be called the term "folding" throughout this text.
L'intérêt de cet élément est plus particulièrement illustré à la figure 1 : si l'on prend un rayon r1 émis par la source puis réfléchi en partie haute du réflecteur, on voit que ce rayon passe au dessus du cache pour atteindre la lentille. Ce rayon va participer au faisceau globalement émis par le module. Le rayon r2 émis par la source, lui, est réfléchi par une zone un peu plus basse du réflecteur, et il va, en l'absence de l'élément EO, être stoppé par l'écran : le flux lumineux de ce rayon est donc perdu. Par contre, s'il on prévoit cet élément EO, le rayons r2 atteint la face réfléchissante de l'élément optique EP et va être dévié sous forme d'un rayon r2' vers le haut, au dessus le l'écran : en pliant ainsi vers le haut une partie au moins des rayons qui seraient sinon interceptés par l'écran, le rendement lumineux du module est significativement amélioré.The interest of this element is more particularly illustrated in Figure 1: if we take a ray r1 emitted by the source and then reflected in the upper part of the reflector, we see that this ray passes over the cover to reach the lens. This ray will participate in the overall beam emitted by the module. The radius r2 emitted by the source, it is reflected by a slightly lower zone of the reflector, and it will, in the absence of the element EO, be stopped by the screen: the luminous flux of this ray is so lost. On the other hand, if this element EO is provided, the r2 rays reaches the reflecting face of the optical element EP and will be deflected in the form of a radius r2 'upwards, above the screen: by folding so up at least a portion of the rays that would otherwise be intercepted by the screen, the light output of the module is significantly improved.
Les figures 3a,3b et 3c proposent des variantes de réalisation de cet élément optique EO :
- selon la variante de la figure 3a, l'élément optique est une plaque dont le bord avant Bav adopte le profil en ligne brisée du bord actif du cache C, et dont le bord arrière Bar est identique et aligné avec le bord avant Bav : on a donc un élément sous forme d'une succession de plans inclinés les uns par rapport aux autres et alignés sensiblement selon l'axe optique X du module. On peut moduler la profondeur p et la longueur I de cet élément pour ajuster au mieux les caractéristiques des rayons ainsi « récupérés » dans le faisceau émis par le module.
- selon la variante de la figure 3b, l'élément optique a un profil qui ressemble à celui de la figure 3a, mais ont été ajoutées des stries sur la face réfléchissante. Ces stries sont évolutives,dans la mesure où le bord avant Bav de l'élément se conforme toujours au profil en ligne brisée du cache, les stries ST naissant du bord avant puis évoluent de telle manière que le bord arrière Bar de l'élément optique ait un profil en stries. Ces stries peuvent être concaves ou convexes. Au niveau du bord arrière Bar, elles peuvent avoir une amplitude de 0.2 à 1 mm et un pas de 0.5 à 1.5mm. On peut avoir aussi, alternativement ou cumulativement à la présence de stries, la présence d'ondulations.
- selon la variante de la figure 3c, on retrouve la configuration à stries de la figure 3b, mais ici l'élément optique présente une échancrure, avec deux appendices latéraux A1,A2 également striés dans la continuité du reste de la face réfléchissante, et qui viennent entourer la source S, de façon à augmenter encore la récupération des rayons perdus. Les dimensions de ces appendices A1,A2 sont variables, notamment en fonction du type et de l'emplacement de la source. On peut aussi remarquer de la figure 4 que la largeur de l'élément optique EP est inférieure à celle du bord actif du cache : l'élément EO est approximativement centré sur la partie médiane du cache. Il pourrait être plus large, mais le gain supplémentaire en terme de flux n'est pas très important : il est surtout judicieux de prévoir une telle « plieuse » dans la zone du cache où le flux arrivant est le plus important.
Les figures 4a, 4B, 4c sont des courbes isolux dans une représentation connue des opticiens (mesure à 25 mètres) - la figure 4a correspond aux isolux qu'on obtient avec le module à cache sans l'élément optique selon l'invention de la figure 3b (la variante striée)
- la figure 4b correspond aux isolux qu'on obtient avec le module à cache avec l'élément optique selon l'invention, en isolant les rayons ajoutés dans le faisceau du fait de la présence de cet élément optique
- la figure 4c correspond aux isolux du module complet avec l'élément optique
- according to the variant of Figure 3a, the optical element is a plate whose front edge Bav adopts the broken line profile of the active edge of the cover C, and whose rear edge Bar is identical and aligned with the front edge Bav: on therefore has an element in the form of a succession of planes inclined relative to each other and aligned substantially along the optical axis X of the module. We can modulate the depth p and the length I of this element to better adjust the characteristics of the rays thus "recovered" in the beam emitted by the module.
- according to the variant of Figure 3b, the optical element has a profile that resembles that of Figure 3a, but were added streaks on the reflecting face. These streaks are evolutionary, insofar as the element's front edge Bav always conforms to the broken line profile of the cache, the striations ST arising from the front edge and then evolve in such a way that the rear edge Bar of the optical element has a striated profile. These streaks may be concave or convex. At the rear edge Bar, they can have an amplitude of 0.2 to 1 mm and a step of 0.5 to 1.5mm. We can have, too, alternatively or cumulatively with the presence of streaks, the presence of undulations.
- according to the variant of Figure 3c, there is the striated configuration of Figure 3b, but here the optical element has a notch, with two lateral appendices A1, A2 also striated in continuity with the rest of the reflecting face, and surround the source S, so as to further increase the recovery of lost rays. The dimensions of these appendices A1, A2 are variable, in particular depending on the type and location of the source. It can also be seen from FIG. 4 that the width of the optical element EP is smaller than that of the active edge of the mask: the element EO is approximately centered on the middle part of the mask. It could be wider, but the additional gain in terms of flow is not very important: it is especially advisable to provide such a "folder" in the cache area where the incoming flow is the most important.
FIGS. 4a, 4b, 4c are isolux curves in a known representation of opticians (measurement at 25 meters) - FIG. 4a corresponds to the isolux obtained with the cache module without the optical element according to the invention of FIG. 3b (the striated variant)
- FIG. 4b corresponds to the isoluxes obtained with the cache module with the optical element according to the invention, by isolating the rays added to the beam because of the presence of this optical element
- FIG. 4c corresponds to the isolux of the complete module with the optical element
On peut déduire de ces trois figures que l'invention permet d'ajouter du flux lumineux dans la partie centrale du faisceau : en ajoutant la « plieuse striée » selon la figure 3b, à titre indicatif, on passe d'un flux total d'environ 712 lumens à un flux total d'environ 870 lumens, et on passe d'un maximum d'environ 46 lux à un maximum d'environ 72 lux.It can be deduced from these three figures that the invention makes it possible to add luminous flux in the central part of the beam: by adding the "corrugated folder" according to FIG. 3b, as an indication, one passes from a total flow of about 712 lumens at a total flux of about 870 lumens, and from a maximum of about 46 lux to a maximum of about 72 lux.
On peut évaluer ainsi un gain en rendement lumineux d'au moins 10 jusqu'à 25 % grâce à la présence d'une « plieuse » selon l'invention, toutes choses égales par ailleurs. Et on peut significativement augmenter la portée du faisceau également (maximum augmenté d'au moins 20 %).We can thus evaluate a gain in light output of at least 10 up to 25% thanks to the presence of a "folding machine" according to the invention, all things being equal. And we can significantly increase the scope of the beam also (maximum increased by at least 20%).
On peut également modifier la forme du faisceau global par la « plieuse », notamment l'étaler en choisissant de façon appropriée la répartition de stries ou ondulations à la surface de la plieuse.It is also possible to modify the shape of the overall beam by the "bending machine", in particular to spread it out by appropriately selecting the distribution of striations or corrugations on the surface of the folder.
L'effet positif de la plieuse est présent quelle que soit la forme de la coupure (code, motorway ..) et elle peut s'adapter quelle que soit la forme de l'écran (qui peut être mono ou multi composant).The positive effect of the folder is present regardless of the form of the cut (code, motorway ..) and it can adapt whatever the shape of the screen (which can be mono or multi component).
L'invention peut s'appliquer mutadis mutandis à des modules elliptiques ayant un cache qui est mobile : dans ce cas il est à prévoir un moteur pour actionner, de préférence de façon solidaire, le cache et la plieuse.The invention can be applied mutadis mutandis to elliptical modules having a cache that is movable: in this case it is necessary to provide a motor for actuating, preferably integrally, the cache and the folder.
La plieuse peut aussi être désolidarisée du cache.The folder can also be detached from the cache.
Claims (18)
Priority Applications (2)
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PL06291099T PL1746340T3 (en) | 2005-07-21 | 2006-07-03 | Optical module for a motor vehicle lighting device |
SI200630421T SI1746340T1 (en) | 2005-07-21 | 2006-07-03 | Optical module for a motor vehicle lighting device |
Applications Claiming Priority (1)
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FR0507785A FR2888916B1 (en) | 2005-07-21 | 2005-07-21 | OPTICAL MODULE FOR AUTOMOTIVE LIGHTING DEVICE |
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EP1746340A2 true EP1746340A2 (en) | 2007-01-24 |
EP1746340A3 EP1746340A3 (en) | 2007-11-07 |
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FR2964724A1 (en) * | 2010-09-09 | 2012-03-16 | Valeo Vision | Optical module for lighting and signaling device e.g. headlight type light projector, of motor vehicle, has folding element fixed in module in motionless manner with respect to light source, where folding element is made by metal piece |
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US9347639B2 (en) | 2010-07-26 | 2016-05-24 | Valeo Vision | Optical module of an illuminating and/or signalling device of a motor vehicle |
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FR2754039A1 (en) | 1996-10-02 | 1998-04-03 | Valeo Vision | ELLIPTICAL GENERATOR PROJECTOR FOR A MOTOR VEHICLE HAVING AN IMPROVED CUTTING COVER, AND METHOD OF MANUFACTURING THE CACHE |
EP1197387A1 (en) | 2000-10-12 | 2002-04-17 | Valeo Vision | Motor vehicle headlamp comprising an adjustable shade |
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FR2917485A1 (en) * | 2007-06-18 | 2008-12-19 | Valeo Vision Sa | OPTICAL MODULE FOR AUTOMOTIVE LIGHTING DEVICE |
FR2917484A1 (en) * | 2007-06-18 | 2008-12-19 | Valeo Vision Sa | OPTICAL MODULE FOR AUTOMOTIVE LIGHTING DEVICE |
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US9121561B2 (en) | 2010-07-26 | 2015-09-01 | Valeo Vision | Optical module of a lighting and/or signaling device for a motor vehicle |
US9347639B2 (en) | 2010-07-26 | 2016-05-24 | Valeo Vision | Optical module of an illuminating and/or signalling device of a motor vehicle |
US9885454B2 (en) | 2010-07-26 | 2018-02-06 | Valeo Vision | Optical module of an illuminating and/or signaling device of a motor vehicle |
US9500337B2 (en) | 2010-07-26 | 2016-11-22 | Valeo Vision | Optical module of a lighting and/or signaling device for a motor vehicle |
CN103119360B (en) * | 2010-07-26 | 2017-02-08 | 法雷奥照明公司 | Optical module of an illuminating and/or signalling device of a motor vehicle |
FR2964724A1 (en) * | 2010-09-09 | 2012-03-16 | Valeo Vision | Optical module for lighting and signaling device e.g. headlight type light projector, of motor vehicle, has folding element fixed in module in motionless manner with respect to light source, where folding element is made by metal piece |
WO2012079104A1 (en) * | 2010-12-15 | 2012-06-21 | Zizala Lichtsysteme Gmbh | Led light module |
CN103249992B (en) * | 2010-12-15 | 2016-10-12 | 齐扎拉光系统有限责任公司 | Led light module |
CN103249992A (en) * | 2010-12-15 | 2013-08-14 | 齐扎拉光系统有限责任公司 | Led light module |
EP3505816A1 (en) * | 2017-12-26 | 2019-07-03 | Johnson Electric International AG | An optical conversion device |
Also Published As
Publication number | Publication date |
---|---|
EP1746340A3 (en) | 2007-11-07 |
PL1746340T3 (en) | 2009-12-31 |
SI1746340T1 (en) | 2009-12-31 |
US20070019430A1 (en) | 2007-01-25 |
US7722233B2 (en) | 2010-05-25 |
ATE438065T1 (en) | 2009-08-15 |
EP1746340B1 (en) | 2009-07-29 |
ES2328622T3 (en) | 2009-11-16 |
DE602006008074D1 (en) | 2009-09-10 |
FR2888916A1 (en) | 2007-01-26 |
FR2888916B1 (en) | 2007-09-28 |
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