EP0208574B1 - Dipped headlamp for a motor vehicle - Google Patents

Dipped headlamp for a motor vehicle Download PDF

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Publication number
EP0208574B1
EP0208574B1 EP86401216A EP86401216A EP0208574B1 EP 0208574 B1 EP0208574 B1 EP 0208574B1 EP 86401216 A EP86401216 A EP 86401216A EP 86401216 A EP86401216 A EP 86401216A EP 0208574 B1 EP0208574 B1 EP 0208574B1
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EP
European Patent Office
Prior art keywords
filament
reflector
headlamp according
images
horizontal
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.)
Expired
Application number
EP86401216A
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German (de)
French (fr)
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EP0208574A1 (en
Inventor
Patrice Collot
Norbert Brun
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Valeo Vision SAS
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Valeo Vision SAS
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—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
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F21S41/332—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with continuity at the junction between adjacent areas
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/166—Incandescent light sources, e.g. filament or halogen lamps characterised by the shape of the filament
    • 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/323—Optical layout thereof the reflector having two perpendicular cross sections having regular geometrical curves of a distinct nature
    • 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
    • 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

Definitions

  • the present invention relates to a dipped headlight for a motor vehicle, in which the light beam is cut above two horizontal half-planes offset in height.
  • the contour of the cut is defined by two horizontal half-lines, the half-line on the right side being at the level of the horizontal and the half-line on the left side being offset by approximately 1.5% below of the horizontal.
  • the beams meeting these standards are most often designed with a projector provided with a transverse filament lamp cooperating with a parabolic reflector of relatively large focal length, so as to reduce the thickness of the beam and consequently minimize the extra thicknesses due to prisms deflectors on the closing glass.
  • FR-A-2 087 317 describes a projector of this type, in accordance with the preamble of claim 1.
  • One of the aims of the invention is to propose a dipped headlight overcoming the aforementioned drawbacks and allowing maximum recovery of the light flux emitted by the filament of the lamp.
  • the proposed low-beam headlamp conventionally comprises a lamp, a reflector and a closing glass placed in front of the reflector, as well as means for cutting the light beam above two horizontal half-planes offset in height.
  • the headlight has the combination of the characteristics set out in the characterizing part of claim 1.
  • the projector according to the invention shown schematically in Figure 1, comprises a reflector 10, an axial filament lamp 20, and a distribution glass 30 closing the projector.
  • the surface of the reflector is a surface without discontinuity, chosen so as to form images of the filament, all the points of which are advantageously situated below a horizontal plane, all of these images having their highest point aligned on this horizontal plane.
  • absence of discontinuity is meant a second order continuity guaranteed at any point on the surface, that is to say that the radius of curvature and the position of the center of curvature always vary continuously; this arrangement makes it possible, in practice, to produce real surfaces having a very good conformity with the theoretical surfaces, thus avoiding the defects which were specific to the system with "offset paraboloids" described above, the second order continuity makes in particular the reflector perfectly stampable in principle.
  • Ox being the axis of the reflector and the plane xOy being a substantially horizontal plane, that is to say horizontal for a reflector whose axis would be horizontal.
  • the distance separating, in the radial direction, the surface of the reflector from the surface defined by the equation does not exceed 0.15 mm.
  • the normal difference separating, in the vertical plane passing through the origin of the coordinates, the trace of the surface of the reflector of the corresponding least-square parabola does not exceed 0.3 mm (the concept of "parabola least squares "is explained in the two aforementioned documents).
  • the distance from the emissive surface to the axis does not exceed 25% of the diameter of the filament, in one direction or the other.
  • the axial centering of the filament relative to the point of coordinates (f ,, 0, O) is carried out with a tolerance of 10% of the length of the filament, in one direction or the other.
  • Figures 4 to 11 and Figure 12 show the illumination provided by regions 12 to 16 and 11, respectively, of the bare reflector thus defined, with a horizontal axis Ox.
  • the regions 12 'to 19' produce an illumination symmetrical with respect to the vertical vv 'of the illuminations produced by the regions 12 to 19, respectively.
  • the outermost curve corresponds to an illumination of 100 candelas
  • the next curve to an illumination of 1000 candelas
  • the other curves to increasing illuminations of 2000, 4000, ... candelas.
  • the filament-reflector assembly is tilted down and to the right towards the concentration point. maximum as defined by standard SAE J 579 c, as indicated above.
  • these correcting means consist of prisms formed on the homologous regions 30b and 30c of the closing glass (FIG. 3), which are provided with prisms of 1 to 3 °.
  • the central region 30a of the closing glass can be striated in a conventional manner, to obtain the desired comfort and widening for the light beam.
  • the surface 10a of the reflector is extended by two lateral surfaces 10b and 10c of the same equation, but slightly angularly offset (as can be seen in FIG. 15), also by an angle on the order of 1 to 3 °.
  • the reflector of the preceding embodiment is modified (FIG. 2) while retaining the same surface equation, except that the part comprising the regions 16 to 19 is tilted very slightly upwards. on the one hand, and that comprising the regions 16 'to 19' on the other.
  • the regions 30b and 30c of the closing glass can be devoid of prisms, or only very slightly prismatic, which makes it possible to eliminate the dazzling factors due to the multiplicity of horizontal drafts resulting from the presence prisms in the above case.
  • the projector according to the invention is capable of collecting a luminous flux much greater than that given by a paraboloid of an axial filament projector of conventional design, projector whose focal length can hardly be reduced to values less than 29 mm.
  • a low focal length f o for example of 22.5 mm, which makes it possible for example to produce a projector of generally rectangular, symmetrical shape, of 70 mm high and 150 mm wide.
  • the gain in flux is then close to 30% compared to conventional projectors, the most common focal length of which is 31.75 mm and the height always limited to minimum values of the order of 100 mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

La présente invention concerne un projecteur de croisement pour véhicule automobile, dans lequel le faisceau lumineux est coupé au-dessus de deux demi-plans horizontaux décalés en hauteur.The present invention relates to a dipped headlight for a motor vehicle, in which the light beam is cut above two horizontal half-planes offset in height.

Ce type de coupure, qui est notamment décrit dans le FR-A-2 087 317 (correspondant au US-A-3 858 040) est tout particulièrement adapté aux normes d'éclairement en vigueur aux U.S.A., telles qu'elles sont par exemple définies par la norme SAE J 579 C.This type of cutoff, which is described in particular in FR-A-2 087 317 (corresponding to US-A-3 858 040) is very particularly suited to the lighting standards in force in the USA, such as they are for example defined by SAE J 579 C.

Plus précisément, le contour de la coupure est défini par deux demi-droites horizontales, la demi-droite du côté droit étant au niveau de l'horizontale et la demi-droite du côté gauche étant décalée d'environ 1,5 % en dessous de l'horizontale.More precisely, the contour of the cut is defined by two horizontal half-lines, the half-line on the right side being at the level of the horizontal and the half-line on the left side being offset by approximately 1.5% below of the horizontal.

Les faisceaux répondant à ces normes sont le plus souvent conçus avec un projecteur pourvu d'une lampe à filament transversal coopérant avec un réflecteur parabolique de focale relativement importante, de façon à diminuer l'épaisseur du faisceau et par conséquent minimiser les surépaisseurs dues aux prismes déviateurs sur la glace de fermeture.The beams meeting these standards are most often designed with a projector provided with a transverse filament lamp cooperating with a parabolic reflector of relatively large focal length, so as to reduce the thickness of the beam and consequently minimize the extra thicknesses due to prisms deflectors on the closing glass.

Il a été également proposé des projecteurs pourvus d'une lampe à filament axial. Le filament est focalisé dans un réflecteur parabolique, incliné vers le bas pour réduire la déviation demandée aux prismes de la glace, et donc les surépaisseurs de cette dernière.Projectors have also been proposed provided with an axial filament lamp. The filament is focused in a parabolic reflector, tilted downwards to reduce the deviation required from the prisms of the ice, and therefore the thicknesses of the latter.

Plus particulièrement, le FR-A-2 087 317 précité décrit un projecteur de ce type, conformément au préambule de la revendication 1.More particularly, the aforementioned FR-A-2 087 317 describes a projector of this type, in accordance with the preamble of claim 1.

Mais, dans l'un et l'autre cas, il est nécessaire d'utiliser un réflecteur parabolique de focale importante de l'ordre de 29 à 32 mm) donc peu récupératrice de flux.But, in both cases, it is necessary to use a parabolic reflector with a large focal length of the order of 29 to 32 mm) therefore with little flux recovery.

En effet, une focale courte produirait des images trop grandes qui ne permettraient pas de réaliser le faisceau souhaité, à moins de prévoir des prismes très fortement déviateurs au niveau de la glace de fermeture, exigence incompatible avec les nécessités pratiques du moulage (notamment pour les glaces en verre); en outre, des prismes fortement déviateurs ne permettent pas d'obtenir une netteté de coupure satisfaisante en raison des dispersions de lumière produites par les dépouilles très accentuées de la glace.In fact, a short focal length would produce images that are too large and would not allow the desired beam to be produced, unless there are very strongly deflecting prisms at the closing glass, a requirement incompatible with the practical needs of molding (in particular for glass ices); in addition, highly deflecting prisms do not make it possible to obtain satisfactory cutting sharpness due to the light dispersions produced by the very accentuated bodies of the glass.

On a également proposé, pour réduire le rôle dévolu aux prismes de la glace, de former un réflecteur à partir de deux demi-paraboloïdes, mais le réflecteur de ce projecteur présente une discontinuité de surface à l'endroit du raccordement des deux demi-paraboloïdes, de sorte qu'un réflecteur fabriqué selon les enseignements de ce document est difficile à réaliser et reste nécessairement imparfait, en pratique, à l'endroit du raccordement des deux demi-paraboloïdes, ce qui se traduit par une émission de rayons lumineux au-dessus de la coupure.It has also been proposed, in order to reduce the role assigned to the prisms of ice, to form a reflector from two half-paraboloids, but the reflector of this projector has a surface discontinuity at the point of connection of the two half-paraboloids , so that a reflector manufactured according to the teachings of this document is difficult to produce and necessarily remains imperfect, in practice, at the point of connection of the two half-paraboloids, which results in an emission of light rays at the above the cut.

Un des buts de l'invention est de proposer un projecteur de croisement remédiant aux inconvénient précités et autorisant une récupération maximale du flux lumineux émis par le filament de la lampe.One of the aims of the invention is to propose a dipped headlight overcoming the aforementioned drawbacks and allowing maximum recovery of the light flux emitted by the filament of the lamp.

Le projecteur de croisement proposé comport de manière classique, une lampe, un réflecteur et une glace de fermeture placée devant le réflecteur, ainsi que des moyens de coupure du faisceau lumineux au-dessus de deux demi-plans horizontaux décalés en hauteur.The proposed low-beam headlamp conventionally comprises a lamp, a reflector and a closing glass placed in front of the reflector, as well as means for cutting the light beam above two horizontal half-planes offset in height.

Selon l'invention, le projecteur présente la combinaison des caractéristiques exposées dans la partie caractérisante de la revendication 1.According to the invention, the headlight has the combination of the characteristics set out in the characterizing part of claim 1.

Des modes de réalisation préférés sont donnés dans les revendications dépendantes 2 à 9.Preferred embodiments are given in dependent claims 2 to 9.

La description qui va suivre fera mieux comprendre comment l'invention peut être réalisée, tout en faisant apparaître d'autres caractéristiques et avantages.The description which follows will make it easier to understand how the invention can be produced, while revealing other characteristics and advantages.

Sur les dessins:

  • la figure 1 est une vue en coupe, schématique, du projecteur selon l'invention,
  • la figure 2 est une vue de face du réflecteur de ce projecteur,
  • la figure 3 est une vue de face de la glace de fermeture de ce projecteur,
  • les figures 4 à 11 sont des courbes isolux relevées sur un écran normalisé, produites par les zones désignées respectivement 12 à 19 sur la figure 2,
  • la figure 12 est une série de courbes isolux correspondant à la zone référencée 11 sur la figure 2,
  • les figures 13 à 15 sont des vues du réflecteur conformes au second mode de réalisation précité, respectivement vue de dessus en coupe, vue de face et vue en élévation, en coupe selon la ligne XV - XV sur la figure 13.
In the drawings:
  • FIG. 1 is a schematic sectional view of the headlight according to the invention,
  • FIG. 2 is a front view of the reflector of this projector,
  • FIG. 3 is a front view of the closing glass of this projector,
  • FIGS. 4 to 11 are isolux curves recorded on a standardized screen, produced by the zones designated respectively 12 to 19 in FIG. 2,
  • FIG. 12 is a series of isolux curves corresponding to the zone referenced 11 in FIG. 2,
  • FIGS. 13 to 15 are views of the reflector in accordance with the second embodiment mentioned above, respectively seen from above in section, front view and view in elevation, in section along the line XV - XV in FIG. 13.

Le projecteur selon l'invention, représenté schématiquement figure 1, comporte un réflecteur 10, une lampe à filament axial 20, et une glace de répartition 30 fermant le projecteur.The projector according to the invention, shown schematically in Figure 1, comprises a reflector 10, an axial filament lamp 20, and a distribution glass 30 closing the projector.

La surface du réflecteur est une surface sans discontinuité, choisie de manière à former des images du filament dont tous les points sont situés au-dessous d'un plan horizontal avantageusement, toutes ces images ayant leur point le plus haut aligné sur ce plan horizontal.The surface of the reflector is a surface without discontinuity, chosen so as to form images of the filament, all the points of which are advantageously situated below a horizontal plane, all of these images having their highest point aligned on this horizontal plane.

Par "absence de discontinuité", on entend une continuité assurée au second ordre en tout point de la surface, c'est-à-dire que le rayon de courbure et la position du centre de courbure varient toujours continûment; cette disposition permet, en pratique, de réaliser des surfaces réelles présentant une très bonne conformité avec les surfaces théoriques, évitant ainsi les défauts qui étaient propres au système à "paraboloîdes décalés" décrit plus haut la continuité au second ordre rend en particulier le réflecteur parfaitement emboutissable en principe.By "absence of discontinuity" is meant a second order continuity guaranteed at any point on the surface, that is to say that the radius of curvature and the position of the center of curvature always vary continuously; this arrangement makes it possible, in practice, to produce real surfaces having a very good conformity with the theoretical surfaces, thus avoiding the defects which were specific to the system with "offset paraboloids" described above, the second order continuity makes in particular the reflector perfectly stampable in principle.

Le calcul théorique montre que la surface définie par l'équation suivante présente les propriétés énoncées:

Figure imgb0001
avec:

  • I - demi-longueur du filament
  • f, - distance du centre du filament à l'origine des coordonnées
The theoretical calculation shows that the surface defined by the following equation has the stated properties:
Figure imgb0001
 with:
  • I - half length of the filament
  • f, - distance from the center of the filament at the origin of the coordinates

Ox étant l'axe du réflecteur et le plan xOy étant un plan sensiblement horizontal, c'est-à-dire horizontal pour un réflecteur dont l'axe serait horizontal.Ox being the axis of the reflector and the plane xOy being a substantially horizontal plane, that is to say horizontal for a reflector whose axis would be horizontal.

Une telle surface a déjà été définie dans le FR-A-2 536 502 et FR-A-2 536 503, auxquels on se reportera pour de plus amples détails.Such a surface has already been defined in FR-A-2 536 502 and FR-A-2 536 503, to which reference will be made for further details.

De préférence, lorsqu'une telle surface est utilisée, la distance séparant, en direction radiale, la surface du réflecteur de la surface définie par l'équation n'excède pas 0,15 mm.Preferably, when such a surface is used, the distance separating, in the radial direction, the surface of the reflector from the surface defined by the equation does not exceed 0.15 mm.

De préférence également, l'écart normal séparant, dans le plan vertical passant par l'origine des coordonnées, la trace de la surface du réflecteur de la parabole des moindres carrés correspondante n'excède pas 0,3 mm (la notion de "parabole des moindres carrés" est explicitée dans les deux documents précités).Preferably also, the normal difference separating, in the vertical plane passing through the origin of the coordinates, the trace of the surface of the reflector of the corresponding least-square parabola does not exceed 0.3 mm (the concept of "parabola least squares "is explained in the two aforementioned documents).

De préférence également, la distance de la surface émissive à l'axe n'excède 25 % du diamètre du filament, dans un sens ou dans l'autre.Also preferably, the distance from the emissive surface to the axis does not exceed 25% of the diameter of the filament, in one direction or the other.

De préférence également, le centrage axial du filament par rapport au point de coordonnées (f,, 0, O) est réalisé avec une tolérance de 10 % de la longueur du filament, dans un sens ou dans l'autre.Preferably also, the axial centering of the filament relative to the point of coordinates (f ,, 0, O) is carried out with a tolerance of 10% of the length of the filament, in one direction or the other.

Les figures 4 à 11 et la figure 12 montrent l'éclairement procuré par les régions 12 à 16 et 11, respectivement, du réflecteur nu ainsi défini, avec un axe Ox horizontal.Figures 4 to 11 and Figure 12 show the illumination provided by regions 12 to 16 and 11, respectively, of the bare reflector thus defined, with a horizontal axis Ox.

Les régions 12' à 19' produisent un éclairement symétrique par rapport à la verticale vv' des éclairements produits par les régions 12 à 19, respectivement.The regions 12 'to 19' produce an illumination symmetrical with respect to the vertical vv 'of the illuminations produced by the regions 12 to 19, respectively.

Sur ces figures, la courbe la plus extérieure correspond à un éclairement de 100 candelas, la courbe suivante à un éclairement de 1000 candelas et les autres courbes à des éclairements croissants de 2000, 4000, ... candelas.In these figures, the outermost curve corresponds to an illumination of 100 candelas, the next curve to an illumination of 1000 candelas and the other curves to increasing illuminations of 2000, 4000, ... candelas.

L'emploi du réflecteur ainsi défini seul n'est pas suffisant (contrairement au cas des deux documents précités) pour obtenir la coupure souhaitée.The use of the reflector thus defined alone is not sufficient (unlike the case of the two above-mentioned documents) to obtain the desired cut.

C'est pourquoi, au lieu de conserver un axe de réflecteur Ox horizontal (comme c'était le cas dans les deux documents précités), on incline l'ensemble filament-réflecteur vers le bas et vers la droite en direction du point de concentration maximal tel que défini par la norme SAE J 579 c, comme indiqué plus haut.This is why, instead of keeping a horizontal Ox reflector axis (as was the case in the two above-mentioned documents), the filament-reflector assembly is tilted down and to the right towards the concentration point. maximum as defined by standard SAE J 579 c, as indicated above.

Il est alors nécessaire de ramener les images produites par les régions latérales du réflecteur (régions 16 à 19 et 16' à 19') au niveau des deux demi-plans de la coupure, par des moyens correcteurs appropriés.It is then necessary to bring the images produced by the lateral regions of the reflector (regions 16 to 19 and 16 'to 19') to the level of the two half-planes of the cut, by appropriate corrective means.

Dans un premier mode de réalisation, ces moyens correcteurs sont constitués de prismes formés sur les régions homologues 30b et 30c de la glace de fermeture (figure 3), qui sont pourvues de prismes de 1 à 3°. La région centrale 30a de la glace de fermeture peut être striée de manière classique, pour obtenir le confort et l'élargissement souhaités pour le faisceau lumineux.In a first embodiment, these correcting means consist of prisms formed on the homologous regions 30b and 30c of the closing glass (FIG. 3), which are provided with prisms of 1 to 3 °. The central region 30a of the closing glass can be striated in a conventional manner, to obtain the desired comfort and widening for the light beam.

Dans un second mode de réalisation, illustré figures 13 à 15, la surface 10a du réflecteur est prolongée par deux surfaces latérales 10b et 10c de même équation, mais légèrement décalées angulairement (comme on peut le voir figure 15), d'un angle également de l'ordre de 1 à 3°.In a second embodiment, illustrated in FIGS. 13 to 15, the surface 10a of the reflector is extended by two lateral surfaces 10b and 10c of the same equation, but slightly angularly offset (as can be seen in FIG. 15), also by an angle on the order of 1 to 3 °.

En d'autres termes, on modifie le réflecteur du mode de réalisation précédent (figure 2) en conservant la même équation de surface, à ceci près que l'on bascule très légèrement vers le haut la partie comprenant les régions 16 à 19 d'une part, et celle comprenant les régions 16' à 19' d'autre part. Dans ce mode de réalisation, les régions 30b et 30c de la glace de fermeture peuvent être dépourvues de prismes, ou seule ment très faiblement prismées, ce qui permet de supprimer les facteurs d'éblouissement dus à la multiplicité des dépouilles horizontales résultant de la présence des prismes dans le cas précèdent.In other words, the reflector of the preceding embodiment is modified (FIG. 2) while retaining the same surface equation, except that the part comprising the regions 16 to 19 is tilted very slightly upwards. on the one hand, and that comprising the regions 16 'to 19' on the other. In this embodiment, the regions 30b and 30c of the closing glass can be devoid of prisms, or only very slightly prismatic, which makes it possible to eliminate the dazzling factors due to the multiplicity of horizontal drafts resulting from the presence prisms in the above case.

Dans l'un ou l'autre mode de réalisation, le projecteur selon l'invention est capable de recueillir un flux lumineux bien supérieur à celui donné par un paraboloide d'un projecteur à filament axial de conception classique, projecteur dont la focale peut difficilement être réduite à des valeurs inférieures à 29 mm.In either embodiment, the projector according to the invention is capable of collecting a luminous flux much greater than that given by a paraboloid of an axial filament projector of conventional design, projector whose focal length can hardly be reduced to values less than 29 mm.

Au contraire, pour le projecteur de l'invention, il est possible d'utiliser une focale de base fo faible, par exemple de 22,5 mm, ce qui permet de réaliser par exemple un projecteur de forme générale rectangulaire, symétrique, de 70 mm de hauteur et de 150 mm de largeur.On the contrary, for the projector of the invention, it is possible to use a low focal length f o , for example of 22.5 mm, which makes it possible for example to produce a projector of generally rectangular, symmetrical shape, of 70 mm high and 150 mm wide.

Le gain en flux est alors de près de 30 % par rapport aux projecteurs classiques, dont la focale la plus courante est de 31,75 mm et la hauteur toujours limitée à des valeurs minimales de l'ordre de 100 mm.The gain in flux is then close to 30% compared to conventional projectors, the most common focal length of which is 31.75 mm and the height always limited to minimum values of the order of 100 mm.

Claims (10)

1. A dipped headlamp for a motor vehicle, of the kind comprising an axial filament bulb (20), a reflector (10) and a re-distributing glass (30) placed in front of the reflector, together with means for masking the light beam above two horizontal half-planes at different heights, the said masking means comprising means for forming images of the filament all the points of which are situated below a horizontal plane, together with correcting means adapted to effect upward angular displacement of at least some of the said images, so that the images are situated at the level of the two said horizontal masking half-planes, characterised in that:
- the means for forming images of the filament of which all points are situated below a horizontal plane comprise the surface of the reflector, which is without any discontinuity, in cooperation with the filament (20) which is without any occulting mask; - the axis of the filament and the axis of the reflector surface are inclined downwardly by an angle corresponding to the angular level of the lower of the masking halfplanes, with respect to tne horizontal, and laterally by an angle approximately corresponding to the angular half-width of the images of concentration of the filament propagated from the side portions of the reflector, and
- the correcting means so act on the said images of concentration as to direct them towards the highest of the masking half-planes.
2. A headlamp according to Claim 1, wherein the correcting means comprise zones (30b, 30c) of the re-distributing glass (30), provided with prisms and situated facing the said side portions of the reflector.
3. A headlamp according to Claim 1, wherein the correcting means comprise two lateral surface portions (10b, 10c) of the reflector, adjoining the divergent surface portion (10a), being of the same equation as an extension of the latter, and being slightly tilted upwardly, the cover lens being correspondingly smooth or slightly prismatic in the vertical direction.
4. A headlamp according to Claim 1, wherein the divergent central portion is adapted to form images of the filament each of which has its highest point situated in a horizontal plane.
5. A headlamp according to Claim 4, wherein the filament is offset upwardly in a radial direction by a distance (8) such that its light-emitting surface is substantially tangential to the axis (Ox) and the surface is defined by the equation:
Figure imgb0004
in which:
I = half-length of the filament,
fo = distance of the centre of the filament in the plane yOz,
Ox being the axis of the reflector, and the plane xOy being a substantially horizontal plane.
6. A headlamp according to Claim 5, wherein the distance in a radial direction between the surface of the reflector and the surface defined by the equation does not exceed 0,15 mm.
7. A headlamp according to Claim 5, wherein in the vertical plane passing through the co-ordinate origin, the normal separation between the curve of the surface of the reflector and the corresponding "parabola of least squares" does not exceed 0.3 mm.
8. A headlamp according to Claim 5, wherein the distance between the light-emitting surface ana the axis does not exceed 25 % of the diameter of the filament in either one direction or the other.
9. A headlamp according to Claim 5, wherein the filament is axially centred, with respect to the point (Fo) of which the co-ordinates are [fo; 0; 0;], with a tolerance of 10 % of the length (2 1) of the filament, in either one direction or the other.
EP86401216A 1985-06-07 1986-06-05 Dipped headlamp for a motor vehicle Expired EP0208574B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508655A FR2583139B1 (en) 1985-06-07 1985-06-07 CROSSING PROJECTOR FOR MOTOR VEHICLE
FR8508655 1985-06-07

Publications (2)

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EP0208574A1 EP0208574A1 (en) 1987-01-14
EP0208574B1 true EP0208574B1 (en) 1989-08-02

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US (1) US4797797A (en)
EP (1) EP0208574B1 (en)
JP (1) JPS61285601A (en)
AU (1) AU579015B2 (en)
BR (1) BR8602630A (en)
CA (1) CA1278784C (en)
DE (1) DE3664807D1 (en)
FR (1) FR2583139B1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2609148B1 (en) * 1986-12-30 1991-07-12 Cibie Projecteurs MOTOR VEHICLE PROJECTOR COMPRISING A REFLEXER WITH A MODIFIED BOTTOM COMPLEX SURFACE
FR2609146B1 (en) * 1986-12-30 1990-01-05 Cibie Projecteurs MOTOR VEHICLE PROJECTOR COMPRISING A MODIFIED BACKGROUND PARABOLIC REFLECTOR
JP2622564B2 (en) * 1986-12-30 1997-06-18 ヴァレオ ヴイジョン Automotive headlamp with deformed bottom that emits a beam defined by a cut-off
FR2657680B1 (en) * 1990-01-26 1993-02-05 Valeo Vision MOTOR VEHICLE HEADLIGHT COMPRISING AN IMPROVED LIGHT SOURCE.
US5481443A (en) * 1993-05-19 1996-01-02 The Genlyte Group, Inc. In-ground directional light fixture
FR2732747B1 (en) * 1995-04-06 1997-06-20 Valeo Vision MOTOR VEHICLE PROJECTOR CAPABLE OF TRANSMITTING A BEAM DELIMITED BY A CUT TO TWO HALF PLANS OFFSET IN HEIGHT
DE19843986B4 (en) * 1998-09-25 2012-02-23 Automotive Lighting Reutlingen Gmbh Headlights for vehicles
US20080186717A1 (en) * 2007-02-01 2008-08-07 Genlyte Thomas Group Llc Compact In-Grade Luminaire
US7524078B1 (en) 2008-01-18 2009-04-28 Genlyte Thomas Group Llc In-grade lighting fixture
US7905621B1 (en) 2008-01-18 2011-03-15 Genlyte Thomas Group, Llc In-grade lighting fixture

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566590A (en) * 1925-12-22 godley
US1686543A (en) * 1927-02-02 1928-10-09 William H Wood Vehicle headlight
FR2087317A5 (en) * 1970-05-14 1971-12-31 Cibie Projecteurs
FR2396240A1 (en) * 1977-07-01 1979-01-26 Cibie Projecteurs LARGE OPENING CROSSING-ROAD PROJECTOR FOR MOTOR VEHICLES
JPS5459781U (en) * 1977-10-04 1979-04-25
US4481563A (en) * 1982-05-10 1984-11-06 Corning Glass Works Automotive headlight having optics in the reflector
FR2536502B1 (en) * 1982-11-19 1987-01-09 Cibie Projecteurs CROSSING PROJECTOR FOR MOTOR VEHICLE
FR2536503B1 (en) * 1982-11-19 1987-12-31 Cibie Projecteurs FOG SPOTLIGHT FOR MOTOR VEHICLE

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AU579015B2 (en) 1988-11-10
CA1278784C (en) 1991-01-08
JPS61285601A (en) 1986-12-16
FR2583139A1 (en) 1986-12-12
EP0208574A1 (en) 1987-01-14
US4797797A (en) 1989-01-10
DE3664807D1 (en) 1989-09-07
BR8602630A (en) 1987-02-03
FR2583139B1 (en) 1989-02-03
JPH039561B2 (en) 1991-02-08
AU5804186A (en) 1986-12-11

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