EP0581679B1 - Vehicle headlamp comprising a double filament lamp for selectively producing a fog beam and a high beam - Google Patents

Vehicle headlamp comprising a double filament lamp for selectively producing a fog beam and a high beam Download PDF

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Publication number
EP0581679B1
EP0581679B1 EP93401967A EP93401967A EP0581679B1 EP 0581679 B1 EP0581679 B1 EP 0581679B1 EP 93401967 A EP93401967 A EP 93401967A EP 93401967 A EP93401967 A EP 93401967A EP 0581679 B1 EP0581679 B1 EP 0581679B1
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EP
European Patent Office
Prior art keywords
filament
headlight
zone
cup
reflector
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Expired - Lifetime
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EP93401967A
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German (de)
French (fr)
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EP0581679A1 (en
Inventor
François Lopez
Etienne Pauty
Norbert Brun
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Valeo Vision SAS
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Valeo Vision SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F21S41/335—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors 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
    • 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
    • F21S41/164—Incandescent light sources, e.g. filament or halogen lamps having two or more filaments

Definitions

  • the present invention relates to motor vehicle headlamps, and it relates in particular to a headlamp of the type comprising a lamp with two filaments, such as a standard lamp of type "H4", a reflector designed to cooperate with one or more 'other of the two filaments to generate respectively two beams of given configurations, and finally a closing glass.
  • a headlamp of the type comprising a lamp with two filaments, such as a standard lamp of type "H4", a reflector designed to cooperate with one or more 'other of the two filaments to generate respectively two beams of given configurations, and finally a closing glass.
  • H4 lamp has two axial filaments for this purpose, one of which, located at the front, is provided with a concealment cup.
  • the cup filament cooperates with a parabolic reflector to form the passing beam whose cutting profile is determined by the geometry of the cup.
  • the arrangement of the front filament F and the cup C is indicated in FIG. 1a of the drawings.
  • the angle a determines the angle of lifting of the inclined part of the cut, as illustrated in FIG. 2a.
  • a road-fog light of this type conventionally comprises the above-mentioned "H4" lamp, a reflector and a lens.
  • the lamp is not arranged in the manner recommended for a headlamp / dipped beam, but is angularly offset by a value equal to ⁇ / 2, for reasons of symmetry explained below.
  • the position of the front filament F and of the cup C is illustrated in FIG. 1b.
  • the reflector is consisting of two half-paraboloids whose border is a horizontal plane passing through the optical axis, these two half-paraboloids being focused on the filament with cup and on the filament without cup to respectively form the fog beam and the driving beam.
  • a drawback of this known headlight lies in the fact that there is in the reflector a setback between its upper and lower surfaces, this setback being on the one hand the cause of optical anomalies in the beams generated, and on the other hand difficulties in the manufacture of the reflector, whether by stamping of sheet metal or by molding of plastic material, including difficulties in varnishing its reflective surface.
  • Another known solution for producing the reflector consists in using a single paraboloid focused on the cup filament. This solution could overcome the aforementioned drawbacks, but to give the driving beam a correct concentration along the optical axis, it is necessary to equip the reflector with a system of prisms intended to ensure correct refocusing of the driving beam. .
  • DE-A-35 33 117 also discloses a headlight according to the preamble of claim 1.
  • the first zone of the mirror is an ellipso-parabola whose axis is inclined downward, while the second zone of the mirror is a parabola of horizontal axis.
  • the invention aims to overcome the drawbacks of the prior art.
  • a road fog light for a motor vehicle which comprises a lamp 10, a reflector 20 and a front closing window (not shown).
  • the lamp is in this case a so-called H4 standard lamp, comprising a first filament 11 provided with a concealment cup 11a and a second filament 12 devoid of such a cup.
  • the cup filament 11 is located in front of the filament 12, the two filaments being generally cylindrical with respective axes parallel to an optical axis denoted Ox of the projector. These two filaments are also offset in height relative to each other, the filament 11 being disposed immediately above Ox, tangentially to this axis, while the filament 12 is located entirely below Ox.
  • the lamp 10 is oriented so that the cup 11a is arranged as shown in FIG. 1b, that is to say that it lets the light pass symmetrically on each side over an angular extent of 97.5 ° with respect to a vertical directed upwards with respect to the filament.
  • the reflector 20 is produced for example by molding of plastic material, and comprises a reflecting surface provided in this case with two zones 20a and 20b, separated for example by two inclined half-planes as will be seen below.
  • each zone is defined for example in a Cartesian coordinate system (O, x, y, z) in which O corresponds to the bottom of the reflector, Ox constitutes the optical axis, Oy a horizontal direction perpendicular to the axis optical and Oz the vertical direction.
  • O Cartesian coordinate system
  • the upper surface 20a of the reflector is intended to cooperate with the cup filament 11 to generate an anti-fog beam.
  • the surface 20a is produced in accordance with the teachings of patent application FR-A-2 536 503, and in particular in accordance with the equation indicated on page 4 of the description of the above-mentioned application.
  • the base focal point Fa is arranged on the axis Ox preferably in the vicinity of the filament 11 in the direction of this axis.
  • the extent of the surface part 20a corresponds at least approximately to the extent covered by the radiation from the cup filament 11.
  • this area 20a is delimited by two half-planes P1 and P2 passing through l optical axis Ox and symmetrically inclined at an angle of 7.5 ° below the horizontal, in correspondence with the arrangement of the cup 11a.
  • the lamp / reflector assembly forms a beam delimited by a horizontal cut.
  • the lens 30 then comprises, in a manner which is not illustrated but which is conventional in itself, prisms and / or ridges intended for the horizontal spreading of the light coming from the reflector, so as to obtain a suitably spread out fog beam.
  • the area 20b of the reflector comprises a surface of the same type as that of the area 20a, which has the same horizontal generator but whose base focal length, determining a base focus Fb, is different from that of the area 20a.
  • the base focal point Fb is located on the optical axis Ox in the vicinity of the filament 12.
  • the zones 20a and 20b are both exposed to radiation from the rear filament 12 to generate a driving beam.
  • a projector according to the present invention allows, using a standard lamp of type "H4" or the like, to generate with a reflector of a suitable design selectively an anti-fog beam whose cutoff is no longer determined by the geometry of the cup 11a and can therefore, thanks to the characteristics expressed above, be horizontal.
  • the cup 11a associated with the filament 11 played a decisive role for the formation of the cut of the fog beam, the cup 11a does not intervene here for obtain this cut, since the surface 20a of the reflector 20 is sufficient in itself to generate this cut by appropriate positioning of the images formed.
  • the cup 11a therefore has the sole object of preventing the radiation from the filament 11 from being directed towards parts of the reflecting surface (in this case the zone 20b) which are not capable of forming by themselves a any cut.

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

Description

La présente invention a trait aux projecteurs de véhicules automobiles, et elle concerne en particulier un projecteur du type comportant une lampe à deux filaments, telle qu'une lampe normalisée de type "H4", un réflecteur conçu pour coopérer avec l'un ou l'autre des deux filaments pour engendrer respectivement deux faisceaux de configurations données, et enfin une glace de fermeture.The present invention relates to motor vehicle headlamps, and it relates in particular to a headlamp of the type comprising a lamp with two filaments, such as a standard lamp of type "H4", a reflector designed to cooperate with one or more 'other of the two filaments to generate respectively two beams of given configurations, and finally a closing glass.

Il est déjà connu d'utiliser une lampe de type "H4" ou analogue pour former dans un même projecteur, par commutation électrique de l'alimentation des filaments, un faisceau de route et un faisceau antibrouillard. On rappellera à cet égard que la vocation normale d'une lampe H4 est de permettre à un projecteur équipé d'une telle lampe en association avec un réflecteur du genre parabolique de produire au choix un faisceau de croisement délimité par une coupure, dite coupure européenne, à profil en "V" aplati, et un faisceau de route. La lampe H4 comporte à cet effet deux filaments axiaux dont l'un, situé à l'avant, est pourvu d'une coupelle d'occultation. Le filament à coupelle coopère avec un réflecteur parabolique pour former le faisceau de croisement dont le profil de coupure est déterminé par la géométrie de la coupelle. La disposition du filament avant F et de la coupelle C est indiquée sur la figure la des dessins. L'angle a détermine l'angle de relèvement de la partie inclinée de la coupure, comme illustré sur la figure 2a.It is already known to use a lamp of type "H4" or the like to form in the same headlight, by electrical switching of the supply of filaments, a driving beam and an anti-fog beam. It will be recalled in this regard that the normal vocation of an H4 lamp is to allow a projector equipped with such a lamp in association with a reflector of the parabolic type to produce a choice of a passing beam delimited by a cut, called European cut , with a flattened "V" profile, and a driving beam. The H4 lamp has two axial filaments for this purpose, one of which, located at the front, is provided with a concealment cup. The cup filament cooperates with a parabolic reflector to form the passing beam whose cutting profile is determined by the geometry of the cup. The arrangement of the front filament F and the cup C is indicated in FIG. 1a of the drawings. The angle a determines the angle of lifting of the inclined part of the cut, as illustrated in FIG. 2a.

Un projecteur route-antibrouillard de ce type comprend classiquement la lampe "H4" sus-mentionnée, un réflecteur et une glace. Dans ce cas, la lampe n'est pas disposée de la manière préconisée pour un projecteur croisement/route, mais est décalée angulairement d'une valeur égale à α/2, pour des raisons de symétrie expliquées ci-dessous. La position du filament avant F et de la coupelle C est illustrée sur la figure 1b.A road-fog light of this type conventionally comprises the above-mentioned "H4" lamp, a reflector and a lens. In this case, the lamp is not arranged in the manner recommended for a headlamp / dipped beam, but is angularly offset by a value equal to α / 2, for reasons of symmetry explained below. The position of the front filament F and of the cup C is illustrated in FIG. 1b.

Dans une première forme connue, le réflecteur est constitué par deux demi-paraboloïdes dont la frontière est un plan horizontal passant par l'axe optique, ces deux demi-paraboloïdes étant focalisés sur le filament à coupelle et sur le filament sans coupelle pour former respectivement le faisceau antibrouillard et le faisceau route.In a first known form, the reflector is consisting of two half-paraboloids whose border is a horizontal plane passing through the optical axis, these two half-paraboloids being focused on the filament with cup and on the filament without cup to respectively form the fog beam and the driving beam.

Un inconvénient de ce projecteur connu réside en ce qu'il existe dans le réflecteur un décrochement entre ses surfaces supérieure et inférieure, ce décrochement étant à l'origine d'une part d'anomalies optiques dans les faisceaux engengrés, et d'autre part de difficultés dans la fabrication du réflecteur, que ce soit par emboutissage de tôle ou par moulage de matière plastique, y compris des difficultés de vernissage de sa surface réfléchissante.A drawback of this known headlight lies in the fact that there is in the reflector a setback between its upper and lower surfaces, this setback being on the one hand the cause of optical anomalies in the beams generated, and on the other hand difficulties in the manufacture of the reflector, whether by stamping of sheet metal or by molding of plastic material, including difficulties in varnishing its reflective surface.

Une autre solution connue pour réaliser le réflecteur consiste à utiliser un paraboloïde unique focalisé sur le filament à coupelle. Cette solution pourrait pallier les inconvénients précités, mais pour donner au faisceau de route une concentration correcte suivant l'axe optique, il s'avère nécessaire d'équiper le réflecteur d'un système de prismes destinés à assurer une refocalisation correcte du faisceau de route.Another known solution for producing the reflector consists in using a single paraboloid focused on the cup filament. This solution could overcome the aforementioned drawbacks, but to give the driving beam a correct concentration along the optical axis, it is necessary to equip the reflector with a system of prisms intended to ensure correct refocusing of the driving beam. .

Enfin et surtout, un inconvénient commun aux deux solutions connues réside en ce qu'il est impossible d'obtenir un faisceau antibrouillard à coupure horizontale, comme généralement souhaité. Plus précisément, par la conception même de la coupelle d'occultation qui ne s'étend que sur un angle de 75° autour du filament correspondant, le faisceau antibrouillard formé présente une coupure en "V" symétrique, une quantité importante de lumière débordant au-dessus de l'horizontale. La forme générale du faisceau obtenu est illustrée sur la figure 2b.Finally and above all, a drawback common to the two known solutions is that it is impossible to obtain a fog beam with horizontal cutoff, as generally desired. More precisely, by the very design of the concealment cup which extends only over an angle of 75 ° around the corresponding filament, the fog beam formed has a symmetrical "V" cut, a large amount of light overflowing at - above the horizontal. The general shape of the beam obtained is illustrated in Figure 2b.

On connaît également par DE-A-35 33 117 un projecteur selon le préambule de la revendication 1.DE-A-35 33 117 also discloses a headlight according to the preamble of claim 1.

Toutefois, dans ce projecteur connu, la première zone du miroir est une ellipso-parabole dont l'axe est incliné vers le bas, tandis que la seconde zone du miroir est une parabole d'axe horizontal.However, in this known projector, the first zone of the mirror is an ellipso-parabola whose axis is inclined downward, while the second zone of the mirror is a parabola of horizontal axis.

Il en résulte que ces deux zones ne peuvent en aucun cas se raccorder avec continuité, et l'inconvénient précité n'est pas supprimé.It follows that these two zones can in no case be connected with continuity, and the aforementioned drawback is not eliminated.

L'invention vise à pallier les inconvénients de la technique antérieure.The invention aims to overcome the drawbacks of the prior art.

Elle concerne à cet effet un projecteur de véhicule automobile tel que défini dans la revendication 1.To this end, it relates to a motor vehicle headlamp as defined in claim 1.

D'autres aspects, buts et avantages de la présente invention apparaîtront mieux à la lecture de la description détaillée suivante d'un mode de réalisation préférée de celle-ci, donnée à titre d'exemple et faite en référence aux dessins annexés, sur lesquels :

  • les figures 1a et 1b sont des vues de face schématique des filaments à coupelle d'une lampe H4 dans une position classique pour projecteur croisement-route et pour projecteur antibrouillard-route, respectivement,
  • les figures 2a et 2b illustrent schématiquement les contours des faisceaux de croisement et antibrouillard obtenus avec des projecteurs équipés de lampes disposées conformément aux figures la et 2a, respectivement,
  • la figure 3 est une vue de face d'un ensemble lampe-réflecteur d'un projecteur antibrouillard-route selon une première forme de réalisation de l'invention,
  • la figure 4 est une vue en coupe verticale axiale du projecteur de la figure 3, et
  • la figure 5 est une vue en coupe horizontale axiale du projecteur des figures 3 et 4.
Other aspects, objects and advantages of the present invention will appear better on reading the following detailed description of a preferred embodiment thereof, given by way of example and made with reference to the accompanying drawings, in which :
  • FIGS. 1a and 1b are schematic front views of the cup filaments of an H4 lamp in a conventional position for dipped-beam headlamp and for fog-headlamp headlamp, respectively,
  • FIGS. 2a and 2b schematically illustrate the contours of the passing beams and of the fog lamps obtained with headlights fitted with lamps arranged in accordance with FIGS. 1 a and 2 a, respectively,
  • FIG. 3 is a front view of a lamp-reflector assembly of a fog-road headlamp according to a first embodiment of the invention,
  • FIG. 4 is a view in axial vertical section of the headlight of FIG. 3, and
  • FIG. 5 is a view in axial horizontal section of the headlight of FIGS. 3 and 4.

On notera préliminairement que, sur les figures 3 à 5, la taille des filaments et, en corollaire les inclinaisons des rayons lumineux engendrés ou réfléchis, ont été exagérés par souci de clarté.It will be noted at the outset that, in FIGS. 3 to 5, the size of the filaments and, as a corollary, the inclinations of the light rays generated or reflected, have been exaggerated for the sake of clarity.

En référence aux figures 3 à 5, on a représenté un projecteur antibrouillard-route pour véhicule automobile qui comprend une lampe 10, un réflecteur 20 et une glace de fermeture frontale (non représentée).Referring to Figures 3 to 5, there is shown a road fog light for a motor vehicle which comprises a lamp 10, a reflector 20 and a front closing window (not shown).

La lampe est en l'espèce une lampe normalisée dite H4, comprenant un premier filament 11 pourvu d'une coupelle d'occultation lla et un second filament 12 dépourvu d'une telle coupelle. Le filament à coupelle 11 est situé en avant du filament 12, les deux filaments étant généralement cylindriques d'axes respectifs parallèles à un axe optique noté Ox du projecteur. Ces deux filaments sont en outre décalés en hauteur l'un par rapport à l'autre, le filament 11 étant disposé immédiatement au-dessus de Ox, de façon tangente à cet axe, tandis que le filament 12 est situé entièrement au-dessous de Ox.The lamp is in this case a so-called H4 standard lamp, comprising a first filament 11 provided with a concealment cup 11a and a second filament 12 devoid of such a cup. The cup filament 11 is located in front of the filament 12, the two filaments being generally cylindrical with respective axes parallel to an optical axis denoted Ox of the projector. These two filaments are also offset in height relative to each other, the filament 11 being disposed immediately above Ox, tangentially to this axis, while the filament 12 is located entirely below Ox.

Par ailleurs, la lampe 10 est orientée de telle sorte que la coupelle lla soit disposée comme montré sur la figure 1b, c'est-à-dire qu'elle laisse passer la lumière symétriquement de chaque côté sur une étendue angulaire de 97,5° par rapport à une verticale dirigée vers le haut par rapport au filament.Furthermore, the lamp 10 is oriented so that the cup 11a is arranged as shown in FIG. 1b, that is to say that it lets the light pass symmetrically on each side over an angular extent of 97.5 ° with respect to a vertical directed upwards with respect to the filament.

Le réflecteur 20 est réalisé par exemple par moulage de matière plastique, et comprend une surface réfléchissante pourvue en l'espèce de deux zones 20a et 20b, séparées par exemple par deux demi-plans inclinés comme on le verra plus loin.The reflector 20 is produced for example by molding of plastic material, and comprises a reflecting surface provided in this case with two zones 20a and 20b, separated for example by two inclined half-planes as will be seen below.

La surface réfléchissante de chaque zone est définie par exemple dans un système de coordonnées cartésiennes (O,x,y,z) dans lequel O correspond au fond du réflecteur, Ox constitue l'axe optique, Oy une direction horizontale perpendiculaire à l'axe optique et Oz la direction verticale.The reflecting surface of each zone is defined for example in a Cartesian coordinate system (O, x, y, z) in which O corresponds to the bottom of the reflector, Ox constitutes the optical axis, Oy a horizontal direction perpendicular to the axis optical and Oz the vertical direction.

La surface supérieure 20a du réflecteur est destinée à coopérer avec le filament à coupelle 11 pour engendrer un faisceau antibrouillard. De façon particulièrement préférée, la surface 20a est réalisée conformément aux enseignements de la demande de brevet FR-A-2 536 503, et en particulier conformément à l'équation indiquée page 4 de la description de la susdite demande.The upper surface 20a of the reflector is intended to cooperate with the cup filament 11 to generate an anti-fog beam. In a particularly preferred manner, the surface 20a is produced in accordance with the teachings of patent application FR-A-2 536 503, and in particular in accordance with the equation indicated on page 4 of the description of the above-mentioned application.

On rappellera simplement qu'une telle surface, qui peut être définie mathématiquement par une équation en (x,y,z) faisant intervenir notamment la position, le diamètre et la longueur du filament 11, ainsi qu'un foyer de base noté Fa, permet d'engendrer des images du filament 11 qui sont toutes situées au-dessous d'une coupure horizontale, et une forme de réalisation optimale de cette surface permet d'engendrer des images dont les points les plus hauts sont tous situés au voisinage de cette coupure.It will simply be recalled that such a surface, which can be defined mathematically by an equation in (x, y, z) involving in particular the position, the diameter and the length of the filament 11, as well as a base focus denoted Fa, makes it possible to generate images of the filament 11 which are all located below a horizontal cut, and an optimal embodiment of this surface makes it possible to generate images whose highest points are all located in the vicinity of this break.

Le foyer de base Fa, de façon également classique en soi, est disposé sur l'axe Ox de préférence au voisinage du filament 11 suivant la direction de cet axe.The base focal point Fa, also conventionally in itself, is arranged on the axis Ox preferably in the vicinity of the filament 11 in the direction of this axis.

De façon préférée, l'étendue de la partie de surface 20a correspond au moins approximativement à l'étendue couverte par le rayonnement issu du filament à coupelle 11. Concrètement, cette zone 20a est délimitée par deux demi-plans P1 et P2 passant par l'axe optique Ox et inclinés symétriquement d'un angle de 7,5° au-dessous de l'horizontale, en correspondance avec la disposition de la coupelle 11a.Preferably, the extent of the surface part 20a corresponds at least approximately to the extent covered by the radiation from the cup filament 11. Concretely, this area 20a is delimited by two half-planes P1 and P2 passing through l optical axis Ox and symmetrically inclined at an angle of 7.5 ° below the horizontal, in correspondence with the arrangement of the cup 11a.

Ainsi, lorsque le filament avant 11 est allumé, l'ensemble lampe/réflecteur forme un faisceau délimité par une coupure horizontale. La glace 30 comporte alors, de façon non illustrée mais classique en soi, des prismes et/ou stries destinés à l'étalement horizontal de la lumière issue du réflecteur, de manière à obtenir un faisceau antibrouillard convenablement étalé.So when the front filament 11 is on, the lamp / reflector assembly forms a beam delimited by a horizontal cut. The lens 30 then comprises, in a manner which is not illustrated but which is conventional in itself, prisms and / or ridges intended for the horizontal spreading of the light coming from the reflector, so as to obtain a suitably spread out fog beam.

Il peut arriver également, notamment lorsque la transition entre les zones 20a et 20b s'effectue non pas selon les plans p1 et P2, mais selon le plan horizontal x0y, que de la lumière soit émise au-dessus de la coupure horizontale recherchée, par les parties de la zone 20a situées entre le plan xOy et les plans P1 et P2. Dans ce cas, on prévoit dans des régions homologues de la glace des prismes ou analogues destinés à rabattre cette lumière vers le bas au moins jusqu'à l'horizontale.It can also happen, in particular when the transition between the zones 20a and 20b takes place not according to the planes p1 and P2, but according to the horizontal plane x0y, that light is emitted above the desired horizontal cut, by the parts of the area 20a located between the plane xOy and the planes P1 and P2. In this case, provision is made in homologous regions of the ice for prisms or the like intended to reduce this light downwards at least to the horizontal.

Etant donné la faible inclinaison des plans de transition P1 et P2, on va considérer ci-dessous, en première approximation, que la section de la surface 20a, dans ces plans, est une parabole focalisée sur le foyer Fa.Given the slight inclination of the transition planes P1 and P2, we will consider below, as a first approximation, that the section of the surface 20a, in these planes, is a parabola focused on the focus Fa.

Dans le présent exemple, la zone 20b du réflecteur comporte une surface du même type que celle de la zone 20a, qui présente la même génératrice horizontale mais dont la focale de base, déterminant un foyer de base Fb, est différente de celle de la zone 20a. Par exemple, le foyer de base Fb est situé sur l'axe optique Ox au voisinage du filament 12.In the present example, the area 20b of the reflector comprises a surface of the same type as that of the area 20a, which has the same horizontal generator but whose base focal length, determining a base focus Fb, is different from that of the area 20a. For example, the base focal point Fb is located on the optical axis Ox in the vicinity of the filament 12.

De la sorte, on obtient une surface réfléchissante qui ne présente pratiquement aucune discontinuité (décrochement) ni aucune rupture de pente au niveau de la transition dans P1 et P2 entre les zones 20a et 20b.In this way, a reflective surface is obtained which exhibits practically no discontinuity (detachment) or any break in slope at the level of the transition in P1 and P2 between the zones 20a and 20b.

Les zones 20a et 20b sont toutes deux exposées au rayonnement issu du filament arrière 12 pour engendrer un faisceau de route.The zones 20a and 20b are both exposed to radiation from the rear filament 12 to generate a driving beam.

Ainsi un projecteur selon la présente invention permet, à l'aide d'une lampe normalisée de type "H4" ou analogue, d'engendrer avec un réflecteur de conception appropriée sélectivement un faisceau anti-brouillard dont la coupure n'est plus déterminée par la géométrie de la coupelle lla et peut donc, grâce aux caractéristiques exprimées plus haut, être horizontale.Thus a projector according to the present invention allows, using a standard lamp of type "H4" or the like, to generate with a reflector of a suitable design selectively an anti-fog beam whose cutoff is no longer determined by the geometry of the cup 11a and can therefore, thanks to the characteristics expressed above, be horizontal.

Plus précisément, on observe que, contrairement à ce qui était pratiqué dans l'art antérieur, où la coupelle 11a associée au filament 11 jouait un rôle décisif pour la formation de la coupure du faisceau antibrouillard, la coupelle 11a n'intervient ici nullement pour obtenir cette coupure, étant donné que la surface 20a du réflecteur 20 se suffit à elle-même pour engendrer cette coupure par positionnement approprié des images formées. La coupelle 11a a donc pour seul objet d'éviter que le rayonnement issu du filament 11 ne soit dirigée vers des parties de la surface réfléchissante (en l'occurence la zone 20b) qui ne sont pas à même de former par elles-mêmes une quelconque coupure.More specifically, it is observed that, contrary to what was practiced in the prior art, where the cup 11a associated with the filament 11 played a decisive role for the formation of the cut of the fog beam, the cup 11a does not intervene here for obtain this cut, since the surface 20a of the reflector 20 is sufficient in itself to generate this cut by appropriate positioning of the images formed. The cup 11a therefore has the sole object of preventing the radiation from the filament 11 from being directed towards parts of the reflecting surface (in this case the zone 20b) which are not capable of forming by themselves a any cut.

Claims (5)

  1. A motor vehicle headlight of the type comprising a two-filament lamp (10) in which a first filament (11) is provided with a cup (11a) so as to allow light to pass over a given angular extent only, and in which a second filament (12) has no such cup, the headlight further comprising a closure glass and a reflector (20) suitable for co-operating with one or the other of the two filaments respectively for generating an anti-fog beam and a main beam, the reflector comprising a reflecting surface having a first zone (20a) whose extent corresponds at least approximately to said given angular extent and whose shape is such that it generates, on its own, images of the first filament in which all of the points of the images lie below a cutoff that extends generally horizontally, and a second zone (20b), said first and second zones co-operating with the second filament to form the main beam, the headlight being characterized in that the first zone and the second zone present substantially the same shape in section in transition planes between said zones.
  2. A headlight according to claim 1, characterized in that the shape of the first zone (20a) is such that the highest points of the images of the first filament (11) are all situated in the vicinity of said generally horizontally extending cutoff.
  3. A headlight according to claim 1 or 2, in which the cup (11a) is symmetrically disposed relative to an axial vertical plane of the headlight so as to define a given angular extent that is essentially delimited by two half-planes (P1, P2) including the optical axis (Ox) of the headlight and sloping by a small amount (α/2) beneath the horizontal, the headlight being characterized in that the transition between the first and second zones (20a, 20b) of the reflecting surface takes place in said half-planes.
  4. A headlight according to claim 3, characterized in that said first zone (20a) has a first base focus (Fa) situated in the vicinity of the first filament (11) and in that said second zone (20b) has a second base focus (Fb) situated at a distance from said first base focus.
  5. A headlight according to claim 4, characterized in that said second base focus (Fb) is situated behind the first base focus (Fa).
EP93401967A 1992-07-30 1993-07-29 Vehicle headlamp comprising a double filament lamp for selectively producing a fog beam and a high beam Expired - Lifetime EP0581679B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9209456A FR2694373B1 (en) 1992-07-30 1992-07-30 Motor vehicle headlamp comprising a lamp with two filaments for selectively generating a fog beam and a driving beam.
FR9209456 1992-07-30

Publications (2)

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EP0581679A1 EP0581679A1 (en) 1994-02-02
EP0581679B1 true EP0581679B1 (en) 1997-02-12

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EP93401967A Expired - Lifetime EP0581679B1 (en) 1992-07-30 1993-07-29 Vehicle headlamp comprising a double filament lamp for selectively producing a fog beam and a high beam

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US (1) US5544021A (en)
EP (1) EP0581679B1 (en)
JP (1) JP3448828B2 (en)
DE (1) DE69308083T2 (en)
ES (1) ES2099922T3 (en)
FR (1) FR2694373B1 (en)

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Also Published As

Publication number Publication date
DE69308083T2 (en) 1997-07-10
JPH06187806A (en) 1994-07-08
DE69308083D1 (en) 1997-03-27
FR2694373B1 (en) 1994-11-04
JP3448828B2 (en) 2003-09-22
ES2099922T3 (en) 1997-06-01
FR2694373A1 (en) 1994-02-04
EP0581679A1 (en) 1994-02-02
US5544021A (en) 1996-08-06

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