EP0773400B1 - Vehicle headlamp comprising a reflector capable to generate a light pattern with V-shaped cut off on its own - Google Patents

Vehicle headlamp comprising a reflector capable to generate a light pattern with V-shaped cut off on its own Download PDF

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Publication number
EP0773400B1
EP0773400B1 EP96402390A EP96402390A EP0773400B1 EP 0773400 B1 EP0773400 B1 EP 0773400B1 EP 96402390 A EP96402390 A EP 96402390A EP 96402390 A EP96402390 A EP 96402390A EP 0773400 B1 EP0773400 B1 EP 0773400B1
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Prior art keywords
cut
line
reflector
horizontal
plane
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German (de)
French (fr)
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EP0773400A1 (en
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Laurent Evrard
Denis Saladin
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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
    • F21S41/30—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

Definitions

  • the present invention relates generally to automotive headlights, and more especially a new projector whose mirror is designed to cooperate with a source without a cup occultation, that is to say emitting light while around it, to form a passing beam European standard.
  • Such a European beam is delimited by a cut which is defined in a projection plane normalized by two half-straight lines, one horizontal on the side of the vehicles rolling in opposite direction (left for a direction of right-hand traffic), and the other on the side of the road road, inclined upwards by an angle ⁇ , called angle of cutoff bearing, about 15 °.
  • the half-cut horizontal is on the left, while the half cut raised is on the right.
  • FR-A-2 536 502 a form mirror defined mathematically so that it positions the different images of a source such as cylindrical filament below a straight cut, and preferably with the highest points of these images located in the vicinity of said cut.
  • the mirror is subdivided into an upper part which generates a beam part bounded by a horizontal cut and extending from one side on either side of the central axis, and a lower part which generates a part of the beam delimited by a cut inclined, for example at 15 °, with respect to the horizontal, and also extending on either side of the central axis.
  • the present invention aims to overcome these drawbacks and to propose a new solution, particularly simple, to make a European passing beam standardized presenting, in the absence of any intervention of the ice, a preform in width and a spot of well positioned and well sized concentration, without that this is at the expense of the definition of the cut.
  • the invention provides a vehicle headlamp automobile as defined in claim 1.
  • a mirror 10 of a motor vehicle headlamp which also includes a light source such as incandescent filament 20 of a lamp mounted in a hole lamp 11 from the mirror, and a closing glass 30, slightly striated or smooth.
  • the mirror in this case comprises two zones 12a, 12b.
  • the first zone 12a extends over 262.5 ° between a first limit half-plane P1 extending horizontally and a second limit half-plane P2 extending offset angularly 7.5 ° with respect to a vertical half-plane descending.
  • the second zone 12b covers the rest of the mirror, on 97.5 °, between the aforementioned half-planes.
  • Such a surface is capable of generating images of the filament which are all located below and in the vicinity of a horizontal cut, and which are offset, in this case to the left, relative to the reference center H located on the optical axis.
  • Zone 12b is in turn produced according to the equation (3) from page 9 of the same document, to present the same surface type as zone 12a, with an offset of 15 ° (this value is in no way limiting). However, in in this case the parameters of the equation are chosen for ensure a shift of the filament images to the right.
  • ) and f v f 0 - ((zcos ⁇ - ysin ⁇ ) /
  • ⁇ is the bearing angle of the inclined half-cut and is for example 15 °.
  • zones 12a and 12b connect with continuity of order one in the half-plane of transition P2, that is to say that it exists between surfaces a very slight bend, but no dropout or step.
  • this elbow is attenuated until practically disappear during the polishing step of the mold or imprint used to make the mirror.
  • Figure 3a shows by isocandela curves in a normalized projection plane (H, h, v) the photometry of the part of the beam generated by zone 12a, in the absence closing ice.
  • H, h, v normalized projection plane
  • Figure 3b shows the photometry obtained for the area 12b. It is observed that the half-cut noted Hc is obtained with sharpness over a substantial extent, and that the concentration immediately to the right of the east axis satisfactory, to properly light the side of the road in the distance.
  • the mirror 10 ' consists of two zones 12a' and 12b ', separated by two half-planes P1' and P2 'aligned with each other and offset by 7.5 ° (non-limiting value) counterclockwise by with respect to the upper and lower vertical half-planes respectively.
  • zone 12a corresponds to equation (2) of document FR-A-2 599 121 mentioned above, while the zone 12b 'meets equation (3) also mentioned above.
  • Figures 6a and 6b illustrate the photometry of the two beam parts obtained respectively with the zones 12a 'and 12b', in the absence of ice.
  • a certain width is already acquired from the fact that the two beam parts occupy substantially two juxtaposed areas of the cut, while that the concentration spots of the two beam parts will merge into a spot of enlarged concentration whose the intensity is not excessive.
  • the part of the beam extending under the inclined half-cut Hc of the screen of normalized projection is enhanced in intensity.

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

Description

La présente invention concerne d'une façon générale les projecteurs de véhicules automobiles, et plus particulièrement un nouveau projecteur dont le miroir est conçu pour coopérer avec une source dépourvue de coupelle d'occultation, c'est-à-dire émettant de la lumière tout autour d'elle, pour former un faisceau de croisement européen normalisé.The present invention relates generally to automotive headlights, and more especially a new projector whose mirror is designed to cooperate with a source without a cup occultation, that is to say emitting light while around it, to form a passing beam European standard.

Un tel faisceau européen est délimité par une coupure qui est définie dans un plan de projection normalisé par deux demi-droites, l'une horizontale du côté des véhicules roulant en sens inverse (à gauche pour un sens de circulation à droite), et l'autre, du côté du bas-côté de la route, inclinée vers le haut d'un angle α, dit angle de relèvement de coupure, d'environ 15°.Such a European beam is delimited by a cut which is defined in a projection plane normalized by two half-straight lines, one horizontal on the side of the vehicles rolling in opposite direction (left for a direction of right-hand traffic), and the other on the side of the road road, inclined upwards by an angle α, called angle of cutoff bearing, about 15 °.

Ce profil de coupure amène à parler de coupure "en V".This cut profile leads to talk of a "V" cut.

Pour un sens de circulation à droite,la demi-coupure horizontale est à gauche, tandis que la demi-coupure relevée est à droite.For a right-hand traffic direction, the half-cut horizontal is on the left, while the half cut raised is on the right.

On connaít déjà de nombreux documents, dont un certain nombre au nom de la Demanderesse, décrivant des miroirs visant à atteindre ces objectifs.We already know many documents, including some number in the name of the Applicant, describing mirrors aimed at achieving these goals.

On connaít en particulier par FR-A-2 536 502 une forme de miroir définie mathématiquement de telle sorte qu'elle positionne les différentes images d'une source telle qu'un filament cylindrique au-dessous d'une coupure droite, et de préférence avec les points les plus hauts de ces images situés au voisinage de ladite coupure.We know in particular by FR-A-2 536 502 a form mirror defined mathematically so that it positions the different images of a source such as cylindrical filament below a straight cut, and preferably with the highest points of these images located in the vicinity of said cut.

D'autres documents, en particulier FR-A-2 599 121 également au nom de la Demanderesse, visent des miroirs destinés à former le même genre de faisceau, mais avec une photométrie et/ou une largeur améliorée.Other documents, in particular FR-A-2 599 121 also in the name of the Applicant, target mirrors intended to form the same kind of beam, but with a improved photometry and / or width.

On observera ici que l'obtention à l'aide du miroir nu d'un faisceau présentant une largeur substantielle permet de minimiser l'importance des stries ou prismes de déviation formés sur la glace du projecteur, ce qui est avantageux sur le plan du style, ainsi que sur le plan optique notamment si la glace est fortement inclinée par rapport à la verticale (cas des véhicules modernes dont l'avant est particulièrement plongeant).It will be observed here that obtaining using the naked mirror a beam having a substantial width makes it possible to minimize the importance of deflection streaks or prisms formed on the projector glass, which is advantageous on in terms of style, as well as optically, especially if the glass is strongly inclined relative to the vertical (case of modern vehicles whose front is particularly plunging).

On connaít également par le document EP-A-0 558 949 un projecteur conforme au préambule de la revendication 1.Document EP-A-0 558 949 also discloses a headlamp according to the preamble of claim 1.

Dans ce projecteur connu, le miroir est subdivisé en une partie supérieure qui engendre une partie de faisceau délimitée par une coupure horizontale et s'étendant de part et d'autre de l'axe central, et une partie inférieure qui engendre une partie de faisceau délimitée par une coupure inclinée, par exemple à 15°, par rapport à l'horizontale, et s'étendant également de part et d'autre de l'axe central.In this known projector, the mirror is subdivided into an upper part which generates a beam part bounded by a horizontal cut and extending from one side on either side of the central axis, and a lower part which generates a part of the beam delimited by a cut inclined, for example at 15 °, with respect to the horizontal, and also extending on either side of the central axis.

Cette solution connue permet effectivement, lorsque les deux parties de faisceau se combinent, de former un faisceau de croisement européen à coupure en "V".This known solution effectively allows, when the two beam parts combine, to form a beam "V" cut crossover.

Cette solution est toutefois désavantageuse en ce que, les deux parties de faisceau se superposant avec chacune une intensité pratiquement maximale dans l'axe de la route, on obtient un faisceau sans aucune préformation en largeur, et avec une intensité élevée dans l'axe. Il en résulte une grande difficulté de conception des moyens prévus sur la glace pour étaler la lumière, sachant qu'il faut en même temps conférer au faisceau une grande largeur et lui laisser, dans l'axe de la route, une tache de concentration de taille et d'intensité adéquates.This solution is however disadvantageous in that, the two beam parts overlapping each with a practically maximum intensity in the axis of the road, we obtains a beam without any width preformation, and with high intensity in the axis. This results in a great difficulty in designing the means provided on the glass to spread the light, knowing that at the same time time give the beam a large width and it leave, in the axis of the road, a spot of concentration of adequate size and intensity.

La présente invention vise à pallier ces inconvénients et à proposer une nouvelle solution, particulièrement simple, pour réaliser un faisceau de croisement européen normalisé présentant, en l'absence de toute intervention de la glace, une préformation en largeur et une tache de concentration bien positionnée et bien dimensionnée, sans que ce ne soit au détriment de la définition de la coupure.The present invention aims to overcome these drawbacks and to propose a new solution, particularly simple, to make a European passing beam standardized presenting, in the absence of any intervention of the ice, a preform in width and a spot of well positioned and well sized concentration, without that this is at the expense of the definition of the cut.

Ainsi l'invention propose un projecteur de véhicule automobile tel que défini dans la revendication 1. Thus the invention provides a vehicle headlamp automobile as defined in claim 1.

Des aspects préférés de ce projecteur sont définis dans les sous-revendications.Preferred aspects of this projector are defined in the subclaims.

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

  • la figure 1 est une vue de dos du miroir d'un projecteur selon une première forme de réalisation de l'invention,
  • la figure 2 est une vue en coupe verticale axiale du miroir de la figure 1 et de la source associée,
  • la figure 3a représente par un ensemble de courbes isocandéla dans un plan de projection l'éclairement obtenu avec une première partie du miroir des figures 1 et 2, nu,
  • la figure 3b représente par un ensemble de courbes isocandéla dans un plan de projection l'éclairement obtenu avec une première partie du miroir des figures 1 et 2, nu,
  • la figure 4 est une vue de dos du miroir d'un projecteur selon une deuxième forme de réalisation de l'invention,
  • la figure 5 est une vue en coupe verticale axiale du miroir de la figure 4 et de la source associée,
  • la figure 6a représente par un ensemble de courbes isocandéla dans un plan de projection l'éclairement obtenu avec une première partie du miroir des figures 4 et 5, nu, et
  • la figure 6b représente par un ensemble de courbes isocandéla dans un plan de projection l'éclairement obtenu avec une première partie du miroir des figures 4 et 5, nu.
    • Other aspects, aims and advantages of the present invention will appear better on reading the following detailed description of two preferred embodiments thereof, given by way of example and made with reference to the appended drawings, in which:
  • FIG. 1 is a rear view of the mirror of a projector according to a first embodiment of the invention,
  • FIG. 2 is a view in axial vertical section of the mirror of FIG. 1 and of the associated source,
  • FIG. 3a represents by a set of isocandela curves in a projection plane the illumination obtained with a first part of the mirror of FIGS. 1 and 2, naked,
  • FIG. 3b represents by a set of isocandela curves in a projection plane the illumination obtained with a first part of the mirror of FIGS. 1 and 2, naked,
  • FIG. 4 is a rear view of the mirror of a projector according to a second embodiment of the invention,
  • FIG. 5 is a view in axial vertical section of the mirror of FIG. 4 and of the associated source,
  • FIG. 6a represents by a set of isocandela curves in a projection plane the illumination obtained with a first part of the mirror of FIGS. 4 and 5, naked, and
  • FIG. 6b represents by a set of isocandela curves in a projection plane the illumination obtained with a first part of the mirror of FIGS. 4 and 5, naked.

    • En référence aux figures 1 et 2, on a représenté un miroir 10 d'un projecteur de véhicule automobile, qui comprend également une source lumineuse telle que le filament incandescent 20 d'une lampe montée dans un trou de lampe 11 du miroir, et une glace de fermeture 30, légèrement striée ou lisse.Referring to Figures 1 and 2, there is shown a mirror 10 of a motor vehicle headlamp, which also includes a light source such as incandescent filament 20 of a lamp mounted in a hole lamp 11 from the mirror, and a closing glass 30, slightly striated or smooth.

    Le miroir comporte en l'espèce deux zones 12a, 12b.The mirror in this case comprises two zones 12a, 12b.

    La première zone 12a s'étend sur 262,5° entre un premier demi-plan limite P1 s'étendant horizontalement et un second demi-plan limite P2 s'étendant de façon décalée angulairement de 7,5° par rapport à un demi-plan vertical descendant.The first zone 12a extends over 262.5 ° between a first limit half-plane P1 extending horizontally and a second limit half-plane P2 extending offset angularly 7.5 ° with respect to a vertical half-plane descending.

    La seconde zone 12b couvre le reste du miroir, sur 97,5°, entre les demi-plans précités.The second zone 12b covers the rest of the mirror, on 97.5 °, between the aforementioned half-planes.

    Ces valeurs angulaires ne sont bien entendu nullement limitatives. Elles correspondent au cas où l'angle de relèvement de coupure α est choisi égal à 15°.These angular values are of course by no means limiting. They correspond to the case where the angle of cutoff bearing α is chosen equal to 15 °.

    Dans le présent exemple, la zone 12a est réalisée conformément à l'équation (2) des pages 8 et 9 du document FR-A-2 599 121, à savoir : x = y2/4fh + z2/(4fh.(4fh.fv+y2)/4fh2+y2) avec fh = f0 + (l/n).(y/|y|) et fv = f0 - (z/|z|).(l+r/2+r/4(1+(z/|z|))) Dans ces équations :

    • (x,y,z) sont les coordonnées cartésiennes selon les axes représentés sur les figures 1 et 2,
    • f0 est une distance focale imaginaire, égale à la distance suivant 0x entre l'origine 0 et le centre du filament en direction axiale,
    • l est la demi-longueur du filament,
    • r est le rayon du filament, et
    • n est un paramètre réel positif choisi dans l'intervalle [0, +∞].
    In the present example, zone 12a is produced in accordance with equation (2) on pages 8 and 9 of document FR-A-2 599 121, namely: x = y 2 / 4f h + z 2 / (4f h . (4f h .f v + y 2 ) / 4f h 2 + y 2 ) with f h = f 0 + ( l / N) (y / |. Y |) and f v = f 0 - (z / | z |). ( l + R / 2 + r / 4 (1+ (z / | z |))) In these equations:
    • (x, y, z) are the Cartesian coordinates along the axes represented in FIGS. 1 and 2,
    • f 0 is an imaginary focal distance, equal to the distance following 0x between the origin 0 and the center of the filament in the axial direction,
    • l is the half length of the filament,
    • r is the radius of the filament, and
    • n is a positive real parameter chosen in the interval [0, + ∞].

    Une telle surface est capable d'engendrer des images du filament qui sont toutes situées au-dessous et au voisinage d'une coupure horizontale, et qui sont décalées, en l'espèce vers la gauche, par rapport au centre de référence H situé sur l'axe optique.Such a surface is capable of generating images of the filament which are all located below and in the vicinity of a horizontal cut, and which are offset, in this case to the left, relative to the reference center H located on the optical axis.

    La zone 12b est quant à elle réalisée selon l'équation (3) de la page 9 du même document, pour présenter le même type de surface que la zone 12a, avec un décalage de 15° (cette valeur n'étant nullement limitative). Toutefois, dans ce cas, les paramètres de l'équation sont choisis pour assurer un décalage des images du filament vers la droite.Zone 12b is in turn produced according to the equation (3) from page 9 of the same document, to present the same surface type as zone 12a, with an offset of 15 ° (this value is in no way limiting). However, in in this case the parameters of the equation are chosen for ensure a shift of the filament images to the right.

    Cette équation (3) s'exprime comme suit x = (ycosα + zsinα)2/4fh + (zcosα - ysinα)2/ ... ... (4fh.(4fh.fv+(ycosα + zsinα)2)/4fh 2+(ycosα + zsinα)2) avec fh = f0+ (l/n).((ycosα + zsinα)/|(ycosα + zsinα)|) et fv = f0- ((zcosα - ysinα)/|(zcosα - ysinα)|). ... ... (l+r/2+r/4(1+((zcosα- ysinα)/|(zcosα - ysinα)|))) où les constantes, paramètres et variables sont comme ci-dessus, et α est l'angle de relèvement de la demi-coupure inclinée et vaut par exemple 15°.This equation (3) is expressed as follows x = (ycosα + zsinα) 2 / 4f h + (zcosα - ysinα) 2 / ... ... (4f h . (4f h .f v + (ycosα + zsinα) 2 ) / 4f h 2 + (ycosα + zsinα) 2 ) with f h = f 0 + ( l /n).((ycosα + zsinα) / | (ycosα + zsinα) |) and f v = f 0 - ((zcosα - ysinα) / | (zcosα - ysinα) |). ... ... ( l + r / 2 + r / 4 (1 + ((zcosα- ysinα) / | (zcosα - ysinα) |))) where the constants, parameters and variables are as above, and α is the bearing angle of the inclined half-cut and is for example 15 °.

    On observera ici que les surfaces des zones 12a et 12b se raccordent avec continuité d'ordre un dans le demi-plan de transition P2, c'est-à-dire qu'il existe entre les surfaces un très léger coude, mais aucun décrochement ou gradin. En pratique, ce coude est atténué jusqu' à pratiquement disparaítre lors de l'étape de polissage du moule ou de l'empreinte servant à fabriquer le miroir.It will be observed here that the surfaces of zones 12a and 12b connect with continuity of order one in the half-plane of transition P2, that is to say that it exists between surfaces a very slight bend, but no dropout or step. In practice, this elbow is attenuated until practically disappear during the polishing step of the mold or imprint used to make the mirror.

    Dans le plan P1, il existe en théorie une discontinuité entre les profils des deux surfaces. Cette discontinuité peut être minimisée, jusqu'à pratiquement disparaítre, par ajustement des paramètres des deux équations. En variante, on peut décaler le plan P1 de 7,5° vers le bas pour garantir la continuité au premier ordre.In the P1 plane, there is in theory a discontinuity between the profiles of the two surfaces. This discontinuity can be minimized, until practically disappeared, by adjustment of the parameters of the two equations. Alternatively, you can shift the P1 plane 7.5 ° down to guarantee continuity at first order.

    La figure 3a montre par des courbes isocandéla dans un plan de projection normalisé (H, h, v) la photométrie de la partie de faisceau engendrée par la zone 12a, en l'absence de glace de fermeture. On observe que la demi-coupure horizontale Hh est définie avec une bonne netteté sur une étendue substantielle, et que la concentration au voisinage de l'axe est satisfaisante.Figure 3a shows by isocandela curves in a normalized projection plane (H, h, v) the photometry of the part of the beam generated by zone 12a, in the absence closing ice. We observe that the half-cut horizontal Hh is defined with good sharpness on a substantial extent, and that the concentration in the vicinity of the axis is satisfactory.

    La figure 3b montre la photométrie obtenue pour la zone 12b. On observe que la demi-coupure relevée Hc est obtenue avec netteté sur une étendue substantielle, et que la concentration immédiatement à droite de l'axe est satisfaisante, pour bien éclairer le bas côté de la route dans le lointain.Figure 3b shows the photometry obtained for the area 12b. It is observed that the half-cut noted Hc is obtained with sharpness over a substantial extent, and that the concentration immediately to the right of the east axis satisfactory, to properly light the side of the road in the distance.

    Maintenant en référence aux figures 4 et 5, on a représenté une autre forme de réalisation de l'invention dans laquelle le miroir 10' est constitué de deux zones 12a' et 12b', séparées par deux demi-plans P1' et P2' alignés l'un avec l'autre et décalés de 7,5° (valeur non limitative) dans le sens inverse de celui des aiguilles d'une montre par rapport aux demi-plans verticaux supérieur et inférieur respectivement.Now with reference to Figures 4 and 5, we have shown another embodiment of the invention in which the mirror 10 'consists of two zones 12a' and 12b ', separated by two half-planes P1' and P2 'aligned with each other and offset by 7.5 ° (non-limiting value) counterclockwise by with respect to the upper and lower vertical half-planes respectively.

    La surface de la zone 12a' répond à l'équation (2) du document FR-A-2 599 121 sus-mentionnée, tandis que la zone 12b' répond à l'équation (3) également sus-mentionnée.The surface of zone 12a 'corresponds to equation (2) of document FR-A-2 599 121 mentioned above, while the zone 12b 'meets equation (3) also mentioned above.

    Avec ces équations et les demi-plans de transition tels qu'indiqués, on assure une continuité de raccordement au premier ordre dans ces deux demi-plans, de la même manière que dans le demi-plan P2 dans la première forme de réalisation.With these equations and the transition half-planes such that indicated, a continuity of connection to the first order in these two half planes, in the same way that in the half-plane P2 in the first form of production.

    Les figures 6a et 6b illustrent la photométrie des deux parties de faisceau obtenues respectivement avec les zones 12a' et 12b', en l'absence de la glace. On comprend que lorsque ces deux parties de faisceau se combinent pour former le faisceau global, une certaine largeur est déjà acquise du fait que les deux parties de faisceau occupent sensiblement deux zones juxtaposées de la coupure, tandis que les taches de concentration des deux parties de faisceau vont se fondre en une tache de concentration élargie dont l'intensité n'est pas excessive.Figures 6a and 6b illustrate the photometry of the two beam parts obtained respectively with the zones 12a 'and 12b', in the absence of ice. We understand that when these two beam parts combine to form the overall beam, a certain width is already acquired from the fact that the two beam parts occupy substantially two juxtaposed areas of the cut, while that the concentration spots of the two beam parts will merge into a spot of enlarged concentration whose the intensity is not excessive.

    Dans cette forme de réalisation, la partie du faisceau s'étendant sous la demi-coupure inclinée Hc de l'écran de projection normalisé est renforcée en intensité.In this embodiment, the part of the beam extending under the inclined half-cut Hc of the screen of normalized projection is enhanced in intensity.

    Claims (4)

    1. A motor vehicle headlight, comprising a light source (20), such as the filament of an incandescent lamp, for emitting light freely around itself, a reflector (10; 10') and a front glass (30), the reflector being adapted to generate by itself a beam which is delimited by a cut-off line defined by a horizontal half cut-off line (hH) and a half cut-off line (Hc) which is elevated through a given angle with respect to the horizontal, the two half cut-off lines being joined at the level of a central reflector axis, the reflector comprising two zones (12a, 12b; 12a', 12b') separated by two transition half planes (P1, P2; P1', P2') passing in the vicinity of the source, and the two zones generating beam portions which are delimited respectively by a horizontal cut-off line containing the said horizontal half cut-off line, and by an inclined cut-off line which contains the said elevated half cut-off line, characterised in that at least one of the two transition half planes extends essentially vertically, in that the first zone (12a; 12a') of the reflector is defined by a surface for generating a part of the beam which, in the vicinity of the cut-off line, is offset to the side of the horizontal half cut-off line (hH) with respect to the said central axis, and in that the second zone (12b; 12b') of the reflector is defined by a surface for generating a part of the beam which, in the vicinity of the cut-off line, is offset to the side of the elevated half cut-off line (Hc) with respect to the said central axis.
    2. A headlight according to Claim 1, characterised in that a first transition half plane (P1) is substantially horizontal, and in that a second transition half plane (P2) is offset angularly with respect to a lower vertical half plane, on the side opposite to the first half plane, by a value (α/2) which is substantially equal to one half of the angle (a) of elevation of the elevated half cut-off line, the first zone (12a) being the zone of greater angular extent.
    3. A headlight according to Claim 1, characterised in that the first and second transition half planes (P1', P2') are aligned and offset angularly with respect to two vertical half planes, namely an upper half plane and a lower half plane respectively, in the same direction and by the same value (α/2) which is substantially equal to one half of the angle (α) of elevation of the elevated half cut-off line.
    4. A headlight according to one of Claims 1 to 3, characterised in that all of the images of the source have their highest point situated in the vicinity of the respective half cut-off line (hH, HC).
    EP96402390A 1995-11-08 1996-11-08 Vehicle headlamp comprising a reflector capable to generate a light pattern with V-shaped cut off on its own Expired - Lifetime EP0773400B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9513203A FR2740858B1 (en) 1995-11-08 1995-11-08 MOTOR VEHICLE PROJECTOR COMPRISING A MIRROR CAPABLE OF GENERATING A V-CUT BEAM BY ITSELF
    FR9513203 1995-11-08

    Publications (2)

    Publication Number Publication Date
    EP0773400A1 EP0773400A1 (en) 1997-05-14
    EP0773400B1 true EP0773400B1 (en) 2003-10-01

    Family

    ID=9484349

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96402390A Expired - Lifetime EP0773400B1 (en) 1995-11-08 1996-11-08 Vehicle headlamp comprising a reflector capable to generate a light pattern with V-shaped cut off on its own

    Country Status (6)

    Country Link
    US (1) US5951156A (en)
    EP (1) EP0773400B1 (en)
    JP (1) JPH09167503A (en)
    DE (1) DE69630185T2 (en)
    ES (1) ES2208722T3 (en)
    FR (1) FR2740858B1 (en)

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2536502B1 (en) * 1982-11-19 1987-01-09 Cibie Projecteurs CROSSING PROJECTOR FOR MOTOR VEHICLE
    FR2599121B1 (en) * 1986-05-26 1988-09-16 Cibie Projecteurs OFFSET MIXED CROSSING PROJECTOR
    DE3808086A1 (en) * 1988-03-11 1989-09-28 Hella Kg Hueck & Co REFLECTOR FOR Dimmed or Dimmable Motor Vehicle Headlights
    DE4206881A1 (en) * 1992-03-05 1993-09-09 Bosch Gmbh Robert LOW-BEAM HEADLIGHTS FOR MOTOR VEHICLES
    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

    Also Published As

    Publication number Publication date
    JPH09167503A (en) 1997-06-24
    ES2208722T3 (en) 2004-06-16
    FR2740858B1 (en) 1998-01-23
    US5951156A (en) 1999-09-14
    DE69630185T2 (en) 2004-07-29
    DE69630185D1 (en) 2003-11-06
    FR2740858A1 (en) 1997-05-09
    EP0773400A1 (en) 1997-05-14

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