EP1260758A1 - Headlight for motor vehicle - Google Patents

Headlight for motor vehicle Download PDF

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Publication number
EP1260758A1
EP1260758A1 EP02291244A EP02291244A EP1260758A1 EP 1260758 A1 EP1260758 A1 EP 1260758A1 EP 02291244 A EP02291244 A EP 02291244A EP 02291244 A EP02291244 A EP 02291244A EP 1260758 A1 EP1260758 A1 EP 1260758A1
Authority
EP
European Patent Office
Prior art keywords
light
lighting
lens
mirror
projector
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.)
Withdrawn
Application number
EP02291244A
Other languages
German (de)
French (fr)
Inventor
P. Albou
A. L'hermine
N. Jousset
R. Nouet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP1260758A1 publication Critical patent/EP1260758A1/en
Withdrawn legal-status Critical Current

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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
    • F21S41/67—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
    • 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
    • F21S41/28—Cover glass
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/635—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by moving refractors, filters or transparent cover plates

Definitions

  • the invention provides a vehicle lighting projector automobile.
  • the invention more particularly provides a projector motor vehicle lighting of the type which includes a light source mounted in a mirror to provide a flux of light passing through an optical lens and forming a beam lighting of an area of the road according to a first distribution of light intensity.
  • the mirror has a concave reflective surface of which the shape is generally elliptical, it can also have other geometric shapes to allow the orientation of the light flow towards the lens.
  • the mirror has a focus which is separate from the top of the concave surface of a distance called focal length.
  • the light flux emitted by the source from the focus is a stream of light whose rays converge at a point.
  • part of the light source is located on the hearth.
  • the emission of the entire light flux does not can be concentrated in the home.
  • the light source, in particular the filament or the electric arc, which provides the flux is not punctual. Therefore, the light flux reflected by the mirror has rays which do not pass through the hearth.
  • the light flow then passes through the converging lens which allows to form a light beam.
  • the mirror and the lens are arranged one relative to each other so that the point of convergence of rays of the light flow correspond to the optical focus of the lens.
  • the reflected rays exit the lens in a horizontal longitudinal direction which is perpendicular to the plane vertical transverse in which the lens extends.
  • the top and the focus of the mirror are axially aligned with the optical focus of the lens.
  • the beam characteristics lighting its intensity is measured in a transverse plane located at a predetermined distance from the exit face of the lens.
  • the light intensity of the beam lighting decreases from an area center on which iso-intensity circles are centered, this is to say circles on which the luminous intensity of the flux is constant.
  • the light beam must illuminate the road near the vehicle without dazzling drivers of oncoming traffic.
  • a concealer also called diaphragm between the light source and the lens.
  • the concealer thus makes it possible to cut off the flow of light to hide the upper part of the beam lighting, the central zone of maximum intensity being located near the beam cutoff line.
  • the beam For the high beam function, the beam must illuminate the route at a distance greater than that of the low beam. Road lighting in the immediate vicinity of the vehicle can causing discomfort to the driver of the vehicle thus increases the risk of accident.
  • Both low beam and high beam functions can be realized by two projectors each ensuring a separate function.
  • the high beam function use the low beam, including the direction of the light beam and the distribution of its light intensity are modified in particular by retracting the blackout, to which is added a lighting projector complementary called code complement. So the source luminous allowing to realize the additional lighting is less powerful than if it were to fully realize the route function.
  • the light flux emitted by the projector for lighting satisfactory of the road is greater than the flux useful for the lighting of the road.
  • the performance of a projector which can be defined as the ratio between the light intensity emitted by the projector and the flux provided by the light source, evolves according to dimensions of the mirror. Indeed, the more the reflective surface of the mirror is large the higher the yield.
  • the invention provides a motor vehicle lighting projector of the type which comprises a light source mounted in a mirror to provide a light flux which passes through an optical lens and which forms a beam of light. lighting of an area of the road according to a first distribution of the light intensity, characterized in that it comprises a reflective member which is arranged between the mirror and the lens and which is capable of deflecting part of the light flux so as to concentrate the light intensity of the deviated part of the flux towards a predetermined portion of the lit area.
  • Figure 1 shows a section through a plane longitudinal and vertical of a motor vehicle headlight 10 which mainly comprises a mounted light source 12 in a rear mirror 14 as well as a converging lens 16 before.
  • the lens 16 is represented schematically by a double arrow in the figures.
  • the light source 12 can consist either in particular in a filament lamp, in accordance with the figures, or as a discharge lamp.
  • the mirror 14 is here of elliptical shape. Its internal surface concave 18 has a reflective coating.
  • the foyer 20 of mirror 14 corresponds substantially to the center of the filament of the light source 12.
  • the rays 22 of the light flux which come from the center of the filament of light source 12 and which are reflected on the internal surface 18 of mirror 14, converging at a point of convergence 24.
  • the converging lens 16 which can form the ice of front protection of the projector 10 comprises a hearth 26.
  • Another ray 32 of the light flux has also been shown. which comes from the rear end of the light source 12.
  • the ray 32 is reflected on the reflecting surface 18 of the mirror 14 and passes through the lens 16. Since the ray 32 does not pass not through the focal point 26 of the lens 16, the radius 32 is deflected by the lens 16 in a direction diverging from the portion central 30 of the lighting beam 28, thus forming a portion device 33.
  • the impact of the lighting beam 28 of such a projector on a transverse measurement surface which is located at a distance predetermined projector 10 is shown schematically in Figure 2.
  • the density of the dotted lines is representative of the light intensity of the beam 28.
  • the impact of the light beam 28 on the surface transverse measurement has a circular central area 34 of maximum intensity which corresponds to the impact of the portion central 30 of the beam 28 and a peripheral zone 36 which corresponds to the impact of the peripheral portion 33 in which the light intensity decreases from the central zone 34.
  • the circles 38 shown in dotted lines, which are concentric with the circular central zone 34 correspond to iso-intensity lines.
  • the longitudinal axis L of the headlight 10 When used in a motor vehicle, the longitudinal axis L of the headlight 10 is slightly inclined towards the low with respect to the horizontal plane, so that the beam 28 illuminates an area of the road according to a first distribution of light intensity.
  • the first distribution of the light intensity of the area lit from the road corresponds to the projection of the distribution of the light intensity of the impact of the lighting beam 28 on the transverse measurement surface in the inclined direction of the headlamp 10.
  • the illuminated area of the road has a central zone and a peripheral zone which are elongated according to a longitudinal direction which corresponds to the direction of vehicle lighting.
  • the entire beam 28 is not useful. Indeed, for example when the headlamp 10 is a main beam, the lower part of the beam 28 lighting is not necessary, it may even interfere with the driver visibility.
  • the invention proposes that the projector 10 includes a reflector 50 which is arranged between the mirror 14 and the lens 16 and which is liable to deviate part of the light flow so as to concentrate the intensity light from the deviated part of the flow towards a portion predetermined area illuminated.
  • the lower part of the light flow from a spotlight according to the state of the art, which could cause driver discomfort, allows depending the invention to increase the light intensity of a portion predetermined illuminated area which is useful and allows increase the visibility of the road, and therefore the comfort of the driver.
  • the predetermined part 48 corresponds to the part that requires the highest light intensity.
  • the reflecting member 50 can have a reflecting surface 52.
  • the member reflector 50 can be a mirror.
  • the reflecting member 50 is a prism 54 of transparent material which is inclined at a predetermined angle relative to the part of the flow to be diverted so that it is reflected on one of its walls.
  • FIG. 5 Such a solution is shown in FIG. 5 in which the ray 32 penetrates inside the prism 54 at an angle of incidence i 1 relative to the straight line 56 perpendicular to the entry face 58. The ray 32 is then deflected by a refractive angle r 1 from normal 56.
  • the limit angle is determined as a function of the refractive index n as well as the wavelength of the radius 32.
  • the prism 52 is positioned so at least part of the rays entering it are reflected on its underside 62 so as to be deflected to concentrate their light intensity towards a predetermined portion of the lighted area of the road.
  • the reflecting member is a mirror 50 or a prism 52, it can be mounted movable relative to the light source 12 of so as to adapt the deviated part of the flow and / or the position of the predetermined portion of said illuminated area.
  • the lighting projector 10 makes it possible to carry out a code function and a route function.
  • the reflector 50 is pivotally mounted around an axis of rotation A.
  • the reflector member 50 constitutes a shutter. Thus, part of the rays, in particular the ray 66, is stopped by the reflecting member 50, thus masking a part of the lit area.
  • the reflecting member 50 presents a transverse profile composed of a horizontal segment and of an inclined segment so as to form a beam cut lighting along the cut-off line 64 shown in FIG. 7.
  • the unit reflector 50 has pivoted so that its reflecting surface deflects part of the light flow, in particular the radius 66 of so as to focus its light intensity on a part predetermined area illuminated.
  • the impact of the beam 28 lighting on the transverse measurement surface is similar to that shown in Figure 4.
  • the radius 66 can pass through the focus 26 of lens 16, which allows its intensity to be concentrated light in the central area 34 of the beam impact 28 on the transverse measurement surface requiring maximum light intensity.
  • Such a projector 10 is advantageously mobile by relation to the structure of the vehicle so as to orient the beam differently depending on its code function or its route function. Indeed, depending on the route, it is advantageous to note slightly the projector compared to its position in operation coded.

Abstract

The headlamp (10) has a light source (12) at the focal point of a mirror (14) which may be elliptical and a lens (16) which is located to produce a parallel beam. Light (32) emanating from a part of the source not exactly at the mirror focal point would remain dispersed after passing through the lens but may be usefully redirected (33) by an auxiliary plane mirror (50) placed between main mirror and lens

Description

L'invention propose un projecteur d'éclairage de véhicule automobile.The invention provides a vehicle lighting projector automobile.

L'invention propose plus particulièrement un projecteur d'éclairage de véhicule automobile du type qui comporte une source lumineuse montée dans un miroir pour fournir un flux de lumière qui traverse une lentille optique et qui forme un faisceau d'éclairage d'une zone de la route selon une première répartition de l'intensité lumineuse.The invention more particularly provides a projector motor vehicle lighting of the type which includes a light source mounted in a mirror to provide a flux of light passing through an optical lens and forming a beam lighting of an area of the road according to a first distribution of light intensity.

Le miroir présente une surface concave réfléchissante dont la forme est généralement elliptique, elle peut aussi présenter d'autres formes géométriques de façon à permettre d'orienter le flux de lumière en direction de la lentille.The mirror has a concave reflective surface of which the shape is generally elliptical, it can also have other geometric shapes to allow the orientation of the light flow towards the lens.

Le miroir comporte un foyer qui est séparé du sommet de la surface concave d'une distance appelée distance focale.The mirror has a focus which is separate from the top of the concave surface of a distance called focal length.

Lorsque la surface est elliptique, le flux de lumière émis par la source à partir du foyer est un flux de lumière dont les rayons convergent en un point.When the surface is elliptical, the light flux emitted by the source from the focus is a stream of light whose rays converge at a point.

Par conséquent, une partie de la source lumineuse est située sur le foyer.Therefore, part of the light source is located on the hearth.

Cependant, l'émission de la totalité du flux de lumière ne peut être concentrée au foyer. La source lumineuse, notamment le filament ou l'arc électrique, qui fournit le flux n'est pas ponctuelle. Par conséquent, le flux de lumière réfléchi par le miroir comporte des rayons qui ne passent pas par le foyer.However, the emission of the entire light flux does not can be concentrated in the home. The light source, in particular the filament or the electric arc, which provides the flux is not punctual. Therefore, the light flux reflected by the mirror has rays which do not pass through the hearth.

Le flux de lumière traverse ensuite la lentille convergente qui permet de former un faisceau d'éclairage.The light flow then passes through the converging lens which allows to form a light beam.

De façon connue, le miroir et la lentille sont agencés l'un par rapport à l'autre de façon que le point de convergence des rayons du flux de lumière corresponde avec le foyer optique de la lentille. Ainsi, les rayons réfléchis sortent de la lentille selon une direction longitudinale horizontale qui est perpendiculaire au plan transversal vertical dans lequel s'étend la lentille. In known manner, the mirror and the lens are arranged one relative to each other so that the point of convergence of rays of the light flow correspond to the optical focus of the lens. Thus, the reflected rays exit the lens in a horizontal longitudinal direction which is perpendicular to the plane vertical transverse in which the lens extends.

Avantageusement le sommet et le foyer du miroir sont alignés axialement avec le foyer optique de la lentille.Advantageously, the top and the focus of the mirror are axially aligned with the optical focus of the lens.

Pour déterminer les caractéristiques du faisceau d'éclairage, son intensité est mesurée dans un plan transversal situé à une distance prédéterminée de la face de sortie de la lentille.To determine the beam characteristics lighting, its intensity is measured in a transverse plane located at a predetermined distance from the exit face of the lens.

Selon cet agencement l'intensité lumineuse du faisceau d'éclairage évolue de façon décroissante à partir d'une zone centrale sur laquelle sont centrés des cercles d'iso-intensité, c'est à dire des cercles sur lesquels l'intensité lumineuse du flux est constante.According to this arrangement the light intensity of the beam lighting decreases from an area center on which iso-intensity circles are centered, this is to say circles on which the luminous intensity of the flux is constant.

Or, selon la fonction à réaliser par le projecteur la répartition de l'intensité lumineuse du faisceau d'éclairage doit être différente.However, depending on the function to be performed by the projector, distribution of the light intensity of the lighting beam must be different.

Pour la fonction feu de croisement, le faisceau d'éclairage doit éclairer la route à proximité du véhicule sans éblouir les conducteurs des véhicules circulant en sens inverse. Pour ce faire, il est connu d'interposer un occulteur, aussi appelé diaphragme entre la source lumineuse et la lentille.For the low beam function, the light beam must illuminate the road near the vehicle without dazzling drivers of oncoming traffic. For this do, it is known to interpose a concealer, also called diaphragm between the light source and the lens.

L'occulteur permet ainsi de réaliser une coupure du flux de lumière pour masquer la partie supérieure du faisceau d'éclairage, la zone centrale d'intensité maximale étant située à proximité de la ligne de coupure du faisceau.The concealer thus makes it possible to cut off the flow of light to hide the upper part of the beam lighting, the central zone of maximum intensity being located near the beam cutoff line.

Pour la fonction feu de route, le faisceau doit éclairer la route à une distance supérieure à celle du feu de croisement. L'éclairage de la route à proximité immédiate du véhicule peut provoquer une gêne du conducteur du véhicule augmente ainsi le risque d'accident.For the high beam function, the beam must illuminate the route at a distance greater than that of the low beam. Road lighting in the immediate vicinity of the vehicle can causing discomfort to the driver of the vehicle thus increases the risk of accident.

Les deux fonctions feu de croisement et feu de route peuvent être réalisées par deux projecteurs assurant chacun une fonction distincte.Both low beam and high beam functions can be realized by two projectors each ensuring a separate function.

De façon à optimiser l'éclairage des véhicules, il est connu pour la fonction feu de route, d'utiliser le feu de croisement, dont la direction du faisceau d'éclairage et la répartition de son intensité lumineuse sont modifiées notamment en escamotant l'occulteur, auquel est ajouté un projecteur d'éclairage complémentaire appelé complément de code. Ainsi, la source lumineuse permettant de réaliser l'éclairage complémentaire est moins puissante que si elle devait réaliser complètement la fonction route.In order to optimize the lighting of vehicles, it is known for the high beam function, use the low beam, including the direction of the light beam and the distribution of its light intensity are modified in particular by retracting the blackout, to which is added a lighting projector complementary called code complement. So the source luminous allowing to realize the additional lighting is less powerful than if it were to fully realize the route function.

Cependant, de telles solutions ne sont pas satisfaisantes. Le flux de lumière émis par le projecteur pour un éclairage satisfaisant de la route est supérieur au flux utile à l'éclairage de la route.However, such solutions are not satisfactory. The light flux emitted by the projector for lighting satisfactory of the road is greater than the flux useful for the lighting of the road.

Le rendement d'un projecteur, qui peut être défini comme le rapport entre l'intensité lumineuse émise par le projecteur et le flux fourni par la source de lumière, évolue en fonction des dimensions du miroir. En effet, plus la surface réfléchissante du miroir est grande plus le rendement est élevé.The performance of a projector, which can be defined as the ratio between the light intensity emitted by the projector and the flux provided by the light source, evolves according to dimensions of the mirror. Indeed, the more the reflective surface of the mirror is large the higher the yield.

Ainsi, l'utilisation de miroirs de plus petit taille, pour des raisons notamment d'encombrement et d'esthétique, nécessite l'utilisation de sources lumineuses plus puissantes et donc plus coûteuses pour un éclairement similaire.Thus, the use of smaller mirrors, for reasons in particular of space and aesthetics, requires the use of more powerful light sources and therefore more expensive for similar lighting.

De façon à fournir une solution à ces problèmes, l'invention propose un projecteur d'éclairage de véhicule automobile du type qui comporte une source lumineuse montée dans un miroir pour fournir un flux de lumière qui traverse une lentille optique et qui forme un faisceau d'éclairage d'une zone de la route selon une première répartition de l'intensité lumineuse,
   caractérisé en ce qu'il comporte un organe réflecteur qui est agencé entre le miroir et la lentille et qui est susceptible de dévier une partie du flux de lumière de façon à concentrer l'intensité lumineuse de la partie déviée du flux vers une portion prédéterminée de la zone éclairée.In order to provide a solution to these problems, the invention provides a motor vehicle lighting projector of the type which comprises a light source mounted in a mirror to provide a light flux which passes through an optical lens and which forms a beam of light. lighting of an area of the road according to a first distribution of the light intensity,
characterized in that it comprises a reflective member which is arranged between the mirror and the lens and which is capable of deflecting part of the light flux so as to concentrate the light intensity of the deviated part of the flux towards a predetermined portion of the lit area.

Selon d'autres caractéristiques de l'invention :

  • l'organe réflecteur comporte une surface réfléchissante ;
  • l'organe réflecteur est un miroir ;
  • l'organe réflecteur est un prisme en matériau transparent qui est incliné d'un angle prédéterminé par rapport à la partie du flux à dévier pour qu'elle soit réfléchie sur l'une des parois de l'organe réflecteur ;
  • ladite portion prédéterminée de la zone éclairée correspond à la portion qui nécessite l'intensité lumineuse la plus élevée ;
  • l'organe réflecteur est monté mobile par rapport à la source lumineuse de façon à adapter la partie déviée du flux et/ou la position de la portion prédéterminée de ladite zone éclairée ;
  • le projecteur d'éclairage permet de réaliser une fonction code et une fonction route, en fonction code, l'organe réflecteur forme obturateur, et en fonction route, l'organe réflecteur est susceptible de dévier la partie du flux de lumière ;
  • la partie déviée du flux passe par le foyer de la lentille.
According to other characteristics of the invention:
  • the reflecting member has a reflecting surface;
  • the reflecting member is a mirror;
  • the reflecting member is a prism of transparent material which is inclined at a predetermined angle relative to the part of the flux to be deflected so that it is reflected on one of the walls of the reflecting member;
  • said predetermined portion of the illuminated area corresponds to the portion which requires the highest light intensity;
  • the reflector member is mounted movable relative to the light source so as to adapt the deviated part of the flux and / or the position of the predetermined portion of said illuminated area;
  • the lighting projector makes it possible to perform a code function and a road function, in code function, the reflector member forms a shutter, and in road function, the reflector member is capable of deflecting the part of the light flow;
  • the deviated part of the flux passes through the focal point of the lens.

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

  • la figure 1 représente schématiquement les composants d'un projecteur d'éclairage réalisé selon l'état de la technique ;
  • la figure 2 représente la répartition de l'intensité lumineuse émise par un projecteur d'éclairage réalisé selon l'état de la technique ;
  • la figure 3 représente schématiquement les composants d'un projecteur d'éclairage réalisé selon l'invention ;
  • la figure 4 représente la répartition de l'intensité lumineuse émise par un projecteur d'éclairage qui comporte un organe réflecteur réalisé conformément à l'invention ;
  • la figure 5 représente en détail et à grande échelle un exemple d'organe réflecteur selon l'invention ;
  • les figures 6 et 8 représentent un exemple de réalisation d'un projecteur permettant de réaliser une fonction code et une fonction route respectivement, conformément à l'invention ;
  • la figure 7 représente la répartition de l'intensité lumineuse émise par le projecteur d'éclairage en fonction code représenté à la figure 6.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings among which:
  • FIG. 1 schematically represents the components of a lighting projector produced according to the state of the art;
  • FIG. 2 represents the distribution of the light intensity emitted by a lighting projector produced according to the state of the art;
  • FIG. 3 schematically represents the components of a lighting projector produced according to the invention;
  • FIG. 4 represents the distribution of the light intensity emitted by a lighting projector which comprises a reflecting member produced in accordance with the invention;
  • FIG. 5 shows in detail and on a large scale an example of a reflecting member according to the invention;
  • Figures 6 and 8 show an embodiment of a projector for performing a code function and a route function respectively, according to the invention;
  • FIG. 7 represents the distribution of the light intensity emitted by the lighting projector according to the code represented in FIG. 6.

Dans la suite de la description on utilisera, à titre non limitatif, une orientation avant arrière et supérieure inférieure conformément à l'orientation notamment des figures 1 et 3.In the following description, we will not use limiting, lower front rear and upper orientation in accordance with the orientation in particular of FIGS. 1 and 3.

On a représenté à la figure 1 une section par un plan longitudinal et vertical d'un projecteur 10 de véhicule automobile qui comporte principalement une source lumineuse 12 montée dans un miroir arrière 14 ainsi qu'une lentille convergente 16 avant.Figure 1 shows a section through a plane longitudinal and vertical of a motor vehicle headlight 10 which mainly comprises a mounted light source 12 in a rear mirror 14 as well as a converging lens 16 before.

La lentille 16 est représentée schématiquement par une double flèche sur les figures.The lens 16 is represented schematically by a double arrow in the figures.

La source lumineuse 12 peut consister indifféremment notamment en une lampe à filament, conformément aux figures, ou en une lampe à décharge.The light source 12 can consist either in particular in a filament lamp, in accordance with the figures, or as a discharge lamp.

Le miroir 14 est ici de forme elliptique. Sa surface interne concave 18 comporte un revêtement réfléchissant. Le foyer 20 du miroir 14 correspond sensiblement au centre du filament de la source lumineuse 12.The mirror 14 is here of elliptical shape. Its internal surface concave 18 has a reflective coating. The foyer 20 of mirror 14 corresponds substantially to the center of the filament of the light source 12.

Ainsi, du fait des propriétés optiques de la forme elliptique, les rayons 22 du flux de lumière, qui sont issus du centre du filament de la source lumineuse 12 et qui sont réfléchis sur la surface interne 18 du miroir 14, convergent en un point de convergence 24.So, due to the optical properties of the elliptical shape, the rays 22 of the light flux, which come from the center of the filament of light source 12 and which are reflected on the internal surface 18 of mirror 14, converging at a point of convergence 24.

La lentille convergente 16 qui peut former la glace de protection avant du projecteur 10 comporte un foyer 26.The converging lens 16 which can form the ice of front protection of the projector 10 comprises a hearth 26.

Lorsque les rayons du flux de lumière traversent la lentille 16, ils forment un faisceau 28 qui permet d'éclairer une zone de la route.When the rays of the light flow pass through the lens 16, they form a beam 28 which makes it possible to illuminate an area of the road.

De façon à obtenir un faisceau d'éclairage 28 dont une portion centrale 30 présente une intensité maximale, le foyer 26 de la lentille 16 et le point de convergence 24 des rayons 22 sont confondus. Les rayons du faisceau d'éclairage 28 qui sortent de la lentille 16 sont alors parallèles entre eux et sont perpendiculaires au plan vertical et transversal T dans lequel s'étend la lentille.So as to obtain a lighting beam 28, one of which central portion 30 has a maximum intensity, the focus 26 of lens 16 and the point of convergence 24 of rays 22 are confused. The rays of the light beam 28 which come out of the lens 16 are then parallel to each other and are perpendicular to the vertical and transverse plane T in which extends the lens.

On a aussi représenté un autre rayon 32 du flux de lumière qui est issu de l'extrémité arrière de la source lumineuse 12. Le rayon 32 est réfléchi sur la surface réfléchissante 18 du miroir 14 et traverse la lentille 16. Étant donné que le rayon 32 ne passe pas par le foyer 26 de la lentille 16, le rayon 32 est dévié par la lentille 16 selon une direction divergente par rapport à la portion centrale 30 du faisceau d'éclairage 28, formant ainsi portion périphérique 33.Another ray 32 of the light flux has also been shown. which comes from the rear end of the light source 12. The ray 32 is reflected on the reflecting surface 18 of the mirror 14 and passes through the lens 16. Since the ray 32 does not pass not through the focal point 26 of the lens 16, the radius 32 is deflected by the lens 16 in a direction diverging from the portion central 30 of the lighting beam 28, thus forming a portion device 33.

L'impact du faisceau d'éclairage 28 d'un tel projecteur sur une surface transversale de mesure qui est située à une distance prédéterminée du projecteur 10 est représenté schématiquement à la figure 2. La densité des pointillés est représentative de l'intensité lumineuse du faisceau 28.The impact of the lighting beam 28 of such a projector on a transverse measurement surface which is located at a distance predetermined projector 10 is shown schematically in Figure 2. The density of the dotted lines is representative of the light intensity of the beam 28.

L'impact du faisceau d'éclairage 28 sur la surface transversale de mesure comporte une zone centrale circulaire 34 d'intensité maximale qui correspond à l'impact de la portion centrale 30 du faisceau 28 et une zone périphérique 36 qui correspond à l'impact de la portion périphérique 33 dans laquelle l'intensité lumineuse décroít à partir de la zone centrale 34.The impact of the light beam 28 on the surface transverse measurement has a circular central area 34 of maximum intensity which corresponds to the impact of the portion central 30 of the beam 28 and a peripheral zone 36 which corresponds to the impact of the peripheral portion 33 in which the light intensity decreases from the central zone 34.

Les cercles 38, représentés en trait pointillé, qui sont concentriques à la zone centrale circulaire 34 correspondent à des lignes d'iso-intensité.The circles 38, shown in dotted lines, which are concentric with the circular central zone 34 correspond to iso-intensity lines.

Lors de son utilisation à bord d'un véhicule automobile, l'axe longitudinal L du projecteur 10 est légèrement incliné vers le bas par rapport au plan horizontal, de façon que le faisceau 28 éclaire une zone de la route selon une première répartition de l'intensité lumineuse.When used in a motor vehicle, the longitudinal axis L of the headlight 10 is slightly inclined towards the low with respect to the horizontal plane, so that the beam 28 illuminates an area of the road according to a first distribution of light intensity.

La première répartition de l'intensité lumineuse de la zone éclairée de la route correspond à la projection de la répartition de l'intensité lumineuse de l'impact du faisceau d'éclairage 28 sur la surface transversale de mesure selon la direction inclinée du projecteur 10. Ainsi, la zone éclairée de la route comporte une zone centrale et une zone périphérique qui sont allongées selon une direction longitudinale qui correspond à la direction de l'éclairage du véhicule.The first distribution of the light intensity of the area lit from the road corresponds to the projection of the distribution of the light intensity of the impact of the lighting beam 28 on the transverse measurement surface in the inclined direction of the headlamp 10. Thus, the illuminated area of the road has a central zone and a peripheral zone which are elongated according to a longitudinal direction which corresponds to the direction of vehicle lighting.

Tel que décrit précédemment, la totalité du faisceau d'éclairage 28 n'est pas utile. En effet, par exemple lorsque le projecteur 10 est un feu de route, la partie inférieure du faisceau d'éclairage 28 n'est pas nécessaire, elle risque même de gêner la visibilité du conducteur.As previously described, the entire beam 28 is not useful. Indeed, for example when the headlamp 10 is a main beam, the lower part of the beam 28 lighting is not necessary, it may even interfere with the driver visibility.

Par conséquent, une partie du flux émis par la source lumineuse 12 n'est pas utile. Le rendement du projecteur n'est alors pas optimal.Therefore, part of the stream emitted by the source bright 12 is not useful. Projector performance is not then not optimal.

De plus l'utilisation d'un miroir dont la surface réfléchissante ne permet pas toujours d'obtenir une intensité lumineuse suffisante dans certaines parties de la zone éclairée de la route.In addition the use of a mirror whose surface reflective does not always allow to obtain an intensity sufficient light in some parts of the illuminated area of the road.

Pour remédier à ces inconvénients l'invention propose que le projecteur 10 comporte un organe réflecteur 50 qui est agencé entre le miroir 14 et la lentille 16 et qui est susceptible de dévier une partie du flux de lumière de façon à concentrer l'intensité lumineuse de la partie déviée du flux vers une portion prédéterminée de la zone éclairée.To remedy these drawbacks, the invention proposes that the projector 10 includes a reflector 50 which is arranged between the mirror 14 and the lens 16 and which is liable to deviate part of the light flow so as to concentrate the intensity light from the deviated part of the flow towards a portion predetermined area illuminated.

Le rayon 32, représenté partiellement en trait pointillé à la figure 3, d'un projecteur qui permet d'éclairer la partie inférieure de la zone périphérique 36 selon l'état de la technique, est dévié de façon à éclairer la partie supérieure de la zone périphérique 36 et/ou la zone centrale 34 de l'impact du faisceau d'éclairage 28 sur la surface transversale de mesure. Ainsi, la répartition de l'intensité lumineuse du projecteur d'éclairage 10 est modifiée. L'impact du faisceau est représenté schématiquement à la figure 4.Department 32, partially shown in dotted lines at the Figure 3, a projector that allows to illuminate the lower part of the peripheral zone 36 according to the state of the art, is deflected so as to illuminate the upper part of the peripheral zone 36 and / or the central zone 34 of the impact of the lighting beam 28 on the transverse measurement surface. So the distribution of the light intensity of the lighting projector 10 is modified. The impact of the beam is shown schematically in the figure 4.

Par exemple pour un feu de route, la partie inférieure du flux de lumière, d'un projecteur selon l'état de la technique, qui risquait de provoquer une gêne de conducteur, permet selon l'invention, d'augmenter l'intensité lumineuse d'une portion prédéterminée de la zone éclairée qui est utile et permet d'augmenter la visibilité de la route, et par conséquent le confort du conducteur.For example for a high beam, the lower part of the light flow, from a spotlight according to the state of the art, which could cause driver discomfort, allows depending the invention to increase the light intensity of a portion predetermined illuminated area which is useful and allows increase the visibility of the road, and therefore the comfort of the driver.

Ainsi, conformément à la figure 4 représentant l'impact du faisceau d'éclairage 28 sur la surface transversale de mesure, la partie inférieure de la zone périphérique 36 est supprimée et l'intensité de lumière est augmentée sur une partie prédéterminée 48 délimitée par un trait mixte.Thus, in accordance with Figure 4 representing the impact of light beam 28 on the transverse measurement surface, the lower part of peripheral zone 36 is deleted and the light intensity is increased over a predetermined part 48 delimited by a dashed line.

Avantageusement, la partie prédéterminée 48 correspond à la partie qui nécessite l'intensité lumineuse la plus élevée.Advantageously, the predetermined part 48 corresponds to the part that requires the highest light intensity.

Conformément à la figure 3, l'organe réflecteur 50 peut comporter une surface réfléchissante 52. Dans ce cas, l'organe réflecteur 50 peut être un miroir.In accordance with FIG. 3, the reflecting member 50 can have a reflecting surface 52. In this case, the member reflector 50 can be a mirror.

Selon une variante, l'organe réflecteur 50 est un prisme 54 en matériau transparent qui est incliné d'un angle prédéterminé par rapport à la partie du flux à dévier pour qu'elle soit réfléchie sur une de ses parois.According to a variant, the reflecting member 50 is a prism 54 of transparent material which is inclined at a predetermined angle relative to the part of the flow to be diverted so that it is reflected on one of its walls.

Une telle solution est représentée à la figure 5 sur laquelle le rayon 32 pénètre à l'intérieur du prisme 54 sous un angle d'incidence i1 par rapport à la droite 56 perpendiculaire à la face d'entrée 58. Le rayon 32 est alors dévié d'un angle réfringent r1 par rapport à la normale 56.Such a solution is shown in FIG. 5 in which the ray 32 penetrates inside the prism 54 at an angle of incidence i 1 relative to the straight line 56 perpendicular to the entry face 58. The ray 32 is then deflected by a refractive angle r 1 from normal 56.

L'angle réfringent r1 est déterminé par la formule suivante: sin(i1)=n*sin(r1) n est l'indice de réfraction du matériau qui constitue le prisme 54 et l'indice de réfraction n est supérieur à 1.The refractive angle r 1 is determined by the following formula: sin (i 1 ) = N * sin (r 1 ) n is the refractive index of the material which constitutes the prism 54 and the refractive index n is greater than 1.

Lorsque le rayon 32 arrive sur la surface inférieure 62 du prisme 52 sous un angle d'incidence i2 supérieur à un angle limite, il subit la réflexion totale. L'angle limite est déterminé en fonction de l'indice de réfraction n ainsi que de la longueur d'onde du rayon 32.When the ray 32 arrives on the lower surface 62 of the prism 52 at an angle of incidence i 2 greater than a limit angle, it undergoes total reflection. The limit angle is determined as a function of the refractive index n as well as the wavelength of the radius 32.

Selon l'invention le prisme 52 est positionné de façon qu'au moins une partie des rayons qui y pénètrent soient réfléchis sur sa face inférieure 62 de façon à être déviés pour concentrer leur intensité lumineuse vers une portion prédéterminée de la zone éclairée de la route.According to the invention the prism 52 is positioned so at least part of the rays entering it are reflected on its underside 62 so as to be deflected to concentrate their light intensity towards a predetermined portion of the lighted area of the road.

Que l'organe réflecteur soit un miroir 50 ou un prisme 52, il peut être monté mobile par rapport à la source lumineuse 12 de façon à adapter la partie déviée du flux et/ou la position de la portion prédéterminée de la ladite zone éclairée.Whether the reflecting member is a mirror 50 or a prism 52, it can be mounted movable relative to the light source 12 of so as to adapt the deviated part of the flow and / or the position of the predetermined portion of said illuminated area.

Selon un exemple de réalisation illustré aux figures 6 à 8, le projecteur d'éclairage 10 permet de réaliser une fonction code et une fonction route.According to an exemplary embodiment illustrated in FIGS. 6 to 8, the lighting projector 10 makes it possible to carry out a code function and a route function.

Pour ce faire, le réflecteur 50 est monté pivotant autour d'un axe de rotation A.To do this, the reflector 50 is pivotally mounted around an axis of rotation A.

En fonction code, l'organe réflecteur 50 constitue un obturateur. Ainsi, une partie des rayons, notamment le rayon 66, est arrêtée par l'organe réflecteur 50, masquant ainsi une partie de la zone éclairée.In code function, the reflector member 50 constitutes a shutter. Thus, part of the rays, in particular the ray 66, is stopped by the reflecting member 50, thus masking a part of the lit area.

De façon que l'impact du faisceau d'éclairage 28 sur la surface transversale de mesure corresponde sensiblement à la représentation illustrée à la figure 7, l'organe réflecteur 50 présente un profil transversal composé d'un segment horizontal et d'un segment incliné de façon à former une coupure du faisceau d'éclairage selon la ligne de coupure 64 représentée à la figure 7.So that the impact of the lighting beam 28 on the transverse measurement surface corresponds substantially to the representation illustrated in FIG. 7, the reflecting member 50 presents a transverse profile composed of a horizontal segment and of an inclined segment so as to form a beam cut lighting along the cut-off line 64 shown in FIG. 7.

En fonction route, conformément à la figure 8, l'organe réflecteur 50 a pivoté de façon que sa surface réfléchissante dévie une partie du flux de lumière, notamment le rayon 66 de façon à concentrer son intensité lumineuse sur une partie prédéterminée de la zone éclairée. L'impact du faisceau d'éclairage 28 sur la surface transversale de mesure est similaire à celui représenté à la figure 4.In road function, in accordance with figure 8, the unit reflector 50 has pivoted so that its reflecting surface deflects part of the light flow, in particular the radius 66 of so as to focus its light intensity on a part predetermined area illuminated. The impact of the beam 28 lighting on the transverse measurement surface is similar to that shown in Figure 4.

Selon une variante, le rayon 66 peut passer par le foyer 26 de la lentille 16, ce qui permet de concentrer son intensité lumineuse dans la zone centrale 34 de l'impact du faisceau d'éclairage 28 sur la surface transversale de mesure nécessitant l'intensité lumineuse maximale. According to a variant, the radius 66 can pass through the focus 26 of lens 16, which allows its intensity to be concentrated light in the central area 34 of the beam impact 28 on the transverse measurement surface requiring maximum light intensity.

Un tel projecteur 10 est avantageusement mobile par rapport à la structure du véhicule de façon à orienter le faisceau de façon différente selon sa fonction code ou sa fonction route. En effet, en fonction route, il est avantageux de relever légèrement le projecteur par rapport à sa position en fonction code.Such a projector 10 is advantageously mobile by relation to the structure of the vehicle so as to orient the beam differently depending on its code function or its route function. Indeed, depending on the route, it is advantageous to note slightly the projector compared to its position in operation coded.

Claims (8)

Projecteur d'éclairage (10) de véhicule automobile du type qui comporte une source lumineuse (12) montée dans un miroir (14) pour fournir un flux de lumière qui traverse une lentille optique (16) et qui forme un faisceau d'éclairage (28) d'une zone de la route selon une première répartition de l'intensité lumineuse,
   caractérisé en ce qu'il comporte un organe réflecteur (50) qui est agencé entre le miroir (14) et la lentille (16) et qui est susceptible de dévier une partie du flux de lumière de façon à concentrer l'intensité lumineuse de la partie déviée du flux vers une portion prédéterminée de la zone éclairée.Motor vehicle lighting projector (10) of the type which comprises a light source (12) mounted in a mirror (14) to supply a light flux which passes through an optical lens (16) and which forms a lighting beam ( 28) of an area of the road according to a first distribution of the light intensity,
characterized in that it comprises a reflecting member (50) which is arranged between the mirror (14) and the lens (16) and which is capable of deflecting part of the light flow so as to concentrate the light intensity of the deviated part of the flow towards a predetermined portion of the illuminated area. Projecteur d'éclairage (10) selon la revendication précédente, caractérisé en ce que l'organe réflecteur (50) comporte une surface réfléchissante (52).Lighting projector (10) according to the preceding claim, characterized in that the reflecting member (50) has a reflecting surface (52). Projecteur d'éclairage (10) selon la revendication précédente, caractérisé en ce que l'organe réflecteur (50) est un miroir (14).Lighting projector (10) according to the preceding claim, characterized in that the reflecting member (50) is a mirror (14). Projecteur d'éclairage (10) selon la revendication 2, caractérisé en ce que l'organe réflecteur (50) est un prisme (54) en matériau transparent qui est incliné d'un angle prédéterminé par rapport à la partie du flux à dévier pour qu'elle soit réfléchie sur l'une des parois (62) de l'organe réflecteur (50).Lighting projector (10) according to claim 2, characterized in that the reflecting member (50) is a prism (54) of transparent material which is inclined at a predetermined angle relative to the part of the flux to be deflected for that it be reflected on one of the walls (62) of the reflecting member (50). Projecteur d'éclairage (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite portion prédéterminée de la zone éclairée correspond à la portion qui nécessite l'intensité lumineuse la plus élevée.Lighting projector (10) according to any one of the preceding claims, characterized in that said predetermined portion of the illuminated area corresponds to the portion which requires the highest light intensity. Projecteur d'éclairage (10) selon la revendication précédente, caractérisé en ce que l'organe réflecteur (50) est monté mobile par rapport à la source lumineuse (12) de façon à adapter la partie déviée du flux et/ou la position de la portion prédéterminée de ladite zone éclairée.Lighting projector (10) according to the preceding claim, characterized in that the reflector member (50) is mounted movable relative to the light source (12) so as to adapt the deviated part of the flux and / or the position of the predetermined portion of said illuminated area. Projecteur d'éclairage (10) selon la revendication précédente, caractérisé en ce qu'il permet de réaliser une fonction code et une fonction route, et en ce que, en fonction code, l'organe réflecteur (50) forme obturateur, et en fonction route, l'organe réflecteur (50) est susceptible de dévier la partie du flux de lumière (28).Lighting projector (10) according to the preceding claim, characterized in that it makes it possible to carry out a code function and a road function, and in that , in code function, the reflecting member (50) forms a shutter, and in road function, the reflector member (50) is capable of deflecting the part of the light flow (28). Projecteur d'éclairage (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie déviée du flux passe par le foyer de la lentille.Lighting projector (10) according to any one of the preceding claims, characterized in that the deviated part of the flux passes through the focal point of the lens.
EP02291244A 2001-05-25 2002-05-17 Headlight for motor vehicle Withdrawn EP1260758A1 (en)

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FR0107009 2001-05-25
FR0107009A FR2825138B1 (en) 2001-05-25 2001-05-25 MOTOR VEHICLE LIGHTING PROJECTOR

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DE102005023817A1 (en) * 2005-05-24 2006-11-30 Bayerische Motoren Werke Ag vehicle headlights
EP1944542A1 (en) * 2007-01-12 2008-07-16 Valeo Vision Double-function headlight for an automobile
FR2917485A1 (en) * 2007-06-18 2008-12-19 Valeo Vision Sa OPTICAL MODULE FOR AUTOMOTIVE LIGHTING DEVICE
US7524094B2 (en) 2005-09-13 2009-04-28 Koito Manufacturing Co., Ltd. Lamp unit for a vehicle headlamp
JP2009266758A (en) * 2008-04-30 2009-11-12 Valeo Vision Double-function headlight for automobile
FR2962785A1 (en) * 2010-07-19 2012-01-20 Valeo Vision PLYWOOD ON TRANSPARENT BLADE WITH FILE
EP3276253A1 (en) * 2016-07-29 2018-01-31 Valeo Vision Lighting module of a motor vehicle headlight with variable-opening beam

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GB2418951A (en) * 2003-05-30 2006-04-12 John Alexander Deschamps Barrier for sealing an opening

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EP0591566A1 (en) * 1992-09-22 1994-04-13 AUTOPAL, s.r.o. Headlamp for motor vehicles
EP0624753A2 (en) * 1993-05-08 1994-11-17 Robert Bosch Gmbh Vehicle headlights
DE19526023A1 (en) * 1995-07-17 1997-01-23 Daimler Benz Ag Headlamp for motor vehicle
FR2761026A1 (en) * 1997-03-18 1998-09-25 Valeo Vision Dual-beam motor vehicle headlamp with single source and reflector

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Publication number Priority date Publication date Assignee Title
EP0591566A1 (en) * 1992-09-22 1994-04-13 AUTOPAL, s.r.o. Headlamp for motor vehicles
EP0624753A2 (en) * 1993-05-08 1994-11-17 Robert Bosch Gmbh Vehicle headlights
DE19526023A1 (en) * 1995-07-17 1997-01-23 Daimler Benz Ag Headlamp for motor vehicle
FR2761026A1 (en) * 1997-03-18 1998-09-25 Valeo Vision Dual-beam motor vehicle headlamp with single source and reflector

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005023817A1 (en) * 2005-05-24 2006-11-30 Bayerische Motoren Werke Ag vehicle headlights
US7524094B2 (en) 2005-09-13 2009-04-28 Koito Manufacturing Co., Ltd. Lamp unit for a vehicle headlamp
DE102006042749B4 (en) * 2005-09-13 2010-07-22 Koito Mfg. Co., Ltd. Lighting unit of a vehicle headlight
EP1944542A1 (en) * 2007-01-12 2008-07-16 Valeo Vision Double-function headlight for an automobile
US7784985B2 (en) 2007-01-12 2010-08-31 Valeo Vision Dual function headlamp for a motor vehicle
FR2917485A1 (en) * 2007-06-18 2008-12-19 Valeo Vision Sa OPTICAL MODULE FOR AUTOMOTIVE LIGHTING DEVICE
EP2006605A1 (en) * 2007-06-18 2008-12-24 Valeo Vision Vehicle headlamp
JP2009266758A (en) * 2008-04-30 2009-11-12 Valeo Vision Double-function headlight for automobile
FR2962785A1 (en) * 2010-07-19 2012-01-20 Valeo Vision PLYWOOD ON TRANSPARENT BLADE WITH FILE
EP2410238A1 (en) * 2010-07-19 2012-01-25 Valeo Vision Optical reflector consisting of a transparent blade with an undercut
EP3276253A1 (en) * 2016-07-29 2018-01-31 Valeo Vision Lighting module of a motor vehicle headlight with variable-opening beam

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FR2825138A1 (en) 2002-11-29
FR2825138B1 (en) 2004-01-09

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