EP0684420A1 - Headlamp comprising a double filament lamp for low and high beam distribution - Google Patents

Headlamp comprising a double filament lamp for low and high beam distribution Download PDF

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Publication number
EP0684420A1
EP0684420A1 EP95401203A EP95401203A EP0684420A1 EP 0684420 A1 EP0684420 A1 EP 0684420A1 EP 95401203 A EP95401203 A EP 95401203A EP 95401203 A EP95401203 A EP 95401203A EP 0684420 A1 EP0684420 A1 EP 0684420A1
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EP
European Patent Office
Prior art keywords
zone
mirror
cut
projector according
filament
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Granted
Application number
EP95401203A
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German (de)
French (fr)
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EP0684420B1 (en
Inventor
Kamislav Fadel
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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
    • 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 generally to motor vehicle lighting projectors.
  • It relates more particularly to a new headlamp equipped with a lamp with two filaments, one of which does not have a concealment cup and makes it possible to generate a driving beam, and the other of which includes such a cup, to generate a passing beam such as a European standard beam with "V" cut.
  • a lamp can in particular be a standard lamp called "H4".
  • Such a lamp is generally associated with a paraboloid mirror, the focus of which is placed between the filaments of the lamp.
  • the headlamp further comprises a lens which comprises series of prisms and / or ridges so as to spread the beam generally horizontally and along the inclined part of the cut, so as to obtain good lighting comfort and satisfy the photometry regulations.
  • the Applicant has developed for a few years mirrors which, associated with filaments devoid of a concealment cup, make it possible to generate beams such as a European passing beam, with both good respect for the cut in "V" shape and good lateral spreading of the light.
  • the glass can be smooth or practically smooth, which is advantageous both in terms of its cost price and in aesthetic terms.
  • Document FR-A-2 664 677 teaches in particular a projector of this type.
  • this type of reflecting surface has the vocation, as has been indicated, of cooperating with a filament devoid of a concealment cup, and is considered a priori to be uninteresting when the filament comprises a cup intended to form the cut.
  • lamps with two filaments one of which is associated with a cup, and very particularly the standard lamps "H4", continue to be widely used to form mainly code / route headlamps.
  • the present invention is based on the idea of investigating whether the surfaces defined mathematically, as mentioned above, could be used with profit with a lamp of type "H4" or equivalent, although there is no incentive, and it has been discovered that, thanks to this type of surface, the quality of the beam can be greatly improved.
  • the present invention relates to a motor vehicle headlamp, of the type comprising a lamp with two filaments, the first of which is intended to form a cut-off beam, a concealment cup being associated therewith for this purpose, and the second of which is intended to form an unbroken beam and emits freely around it, a mirror and a closing glass, characterized in that: the mirror comprises a first zone generally extending in the upper part of the mirror and able to cooperate with the first filament to generate by itself, without intervention of the obscuring cup, a beam part defining at least partially the cut , a second zone generally extending in a lateral part of the mirror and able to cooperate with the filament and a homologous edge of the concealment cup to generate a beam part defining another part of the cut, and a third zone s generally extending in the lower part of the mirror and able to cooperate only with the second filament, and the ice is smooth or slightly deviating.
  • a projector which includes a mirror 200 in which is mounted a bifilament lamp 100, a filament of which is provided with a concealment cup.
  • a bifilament lamp 100 a filament of which is provided with a concealment cup.
  • it is a standard lamp "H4" comprising a first filament 101 for passing beam, associated with a concealing cup 103, and behind the passing filament, and slightly offset towards the bottom, a filament 102 for driving beam, devoid of cup.
  • Such a lamp is normally intended to cooperate with a generally paraboloidal mirror, the focus of which is located somewhere between the filaments, the shape of the cup, which extends over approximately 165 ° around the filament 101 below that -ci, determining a European standard "V" cutoff, with an increase in the cutoff angle ⁇ typically 15 ° in the right half of the beam for a right-hand traffic direction.
  • the mirror is not a paraboloid, but it mainly comprises three areas 210, 220, 230 which will be defined below.
  • the first zone 210 is generally located in the upper part of the mirror, and is delimited by two axial planes, namely a plane P1 inclined slightly downwards by an angle denoted ⁇ , below the axial horizontal plane yOy, in the part left of the mirror, and a plane P2 located in the right part of the mirror and inclined upwards by an angle noted ⁇ above the horizontal axial plane yOy.
  • the angle ⁇ is preferably a few degrees (for example 5 to 12 °).
  • the angle ⁇ is preferably slightly greater than ⁇ , and for example of the order of 15 to 25 °.
  • the mirror 200 comprises a second zone 220 occupying the right region of the mirror (in front view) and extending between the above-mentioned plane P2 and a plane P3 constituting here the symmetric of the plane P2 with respect to the axial horizontal plane yOy.
  • the values chosen for the angles ⁇ and ⁇ ensure that all of the radiation coming from the crossing filament 101 (whose impact area on the mirror is illustrated by the non-hatched area in FIG. 1) meets zone 210 or zone 220, as the case may be, by avoiding at least at the level of zone 220 any possible positional defects of the filament 101 or of the cup 103.
  • the mirror comprises a third zone 230 generally extending in the lower part of the mirror and delimited by the planes P1 and P3. It is intended to cooperate only with the road filament 102 (to which the areas 210 and 220 are of course also exposed).
  • the area 210 of the mirror is constituted in the present example by a reflecting surface defined mathematically and capable of generating by itself a beam of a certain width, of great homogeneity and the images of the filament of which are all located below of a European cut normalized (line hHc s ⁇ Document error ⁇ Figures 7a and 7b).
  • the highest points of the images of the filament are located in the vicinity of the cut.
  • the beam width (while retaining a central concentration) is obtained, without damaging the cut, by giving the surface horizontal profiles such that the horizontal deviation imparted to a ray from a reference focal point gradually varies from the center towards the edges, and is at least locally zero.
  • Such a surface is defined mathematically in particular by document FR-A-2 664 677 in the name of the Applicant, to which reference will be made for more details.
  • the preferred position of the reference focal point, denoted Fc, of the reflecting surface of the zone 210 is illustrated. in FIG. 2. It is located a few millimeters behind the crossing filament 101.
  • FIGS. 6a and 4a illustrate the light distribution obtained on a projection screen respectively with the central sub-area 212 and with the lateral sub-area 211a or 211b of the area 210, respectively.
  • Sub-area 212 although it encapsulates images of the filament which are vertical and fairly slightly inclined relative to the vertical, makes it possible to obtain a portion of beam of limited thickness, clearly defining the left half-cut as well than the central beam concentration spot (Figure 4a).
  • Sub-areas 211a and 211b generate images of the filament that are horizontal and not very inclined relative to the horizontal.
  • Figure 6a shows that the corresponding beam part is relatively thin and has a large spread in width, with good homogeneity conducive to visual comfort.
  • the zone 220 of the mirror is essentially intended to contribute, in cooperation with the corresponding edge of the obscuring cup 103, to the formation of the half-cut inclined at 15 °, with a good concentration of light below of this half-cut in the vicinity of the reference center H.
  • This zone 220 can be formed by a paraboloid sector of revolution coaxial with the filament 101 and the focal point of which is preferably in the vicinity of the reference focal point Fc illustrated in the figure 2.
  • Figure 5a illustrates the light distribution of the beam portion obtained.
  • the zone 220 can be produced in accordance with the aforementioned document FR-A-2 664 677, so as to give, in addition to the width, the beam portion generated, while respecting the inclined half-cut Hc which is defined by the corresponding edge of the cup.
  • the reflecting surface of the area 230 of the mirror is preferably produced in accordance with the teachings of the aforementioned document FR-A.
  • it is a surface whose horizontal profile is defined in accordance with this document but whose vertical profile does not cause cutting.
  • it may be a surface causing a cut.
  • the preferred position of the reference zone of the third zone 230 is indicated at Fr in FIG. 2.
  • FIG. 7a illustrates the globally obtained passing beam, without closing glass, with the mirror described above.
  • FIG. 8a illustrates the driving beam obtained, still without closing glass. Because this beam has width and homogeneity, work by the glass may prove to be superfluous, and the latter may be smooth or slightly deflecting.
  • the various zones 210, 220 and 230 of the mirror 200 can be equipped with ridges intended to further improve the homogeneity of the beam.
  • Figures 3 and 3 illustrate such a mirror.
  • the streaks S1 and S3 located respectively in the zones 210 and 230 are preferably all vertical.
  • the streaks S2 situated in the zone 220 preferably each consist of a vertical portion S2a extending downward from the transition plane P2, and of a portion S2b having an inclination of 10 to 20 ° relative to vertical, extending upward from the transition plane P3.
  • these streak portions are connected to each other continuously by curved connection zones S2c.
  • these streaks are designed flat, zone by zone, with rays of streaks which can change progressively over their length, depending on the deviation sought, and then projected onto the reflecting surface of the mirror.
  • One objective of these streaks is to attenuate the light defect below the reference center H (see FIG. 7a), light defect due to the significant defocusing of the source with respect to the focal point Fc of zones 210 and 220.
  • FIG. 3 illustrates a preferred example of arrangement of the different streaks.
  • Each streak can have two different rays at its two ends. In this case, this radius varies continuously between said ends.
  • Figures 4b to 8b are the counterparts of Figures 4a to 8a, obtained with the ridged mirror as defined above.
  • FIG. 5b shows that, thanks to the S2 double-inclination streaks, the light is spread on the one hand along the inclined half-cut Hc (thanks to the streak portions inclined at about 15 °), and on the other hand along the horizontal half-cut (thanks to the vertical streak portions).
  • Figure 6b also shows that the light defect appearing in the central region of Figure 6a has been filled.
  • FIG. 7b shows, as a result of all of the above, a spot of central concentration of excellent shape and homogeneity, and a very good definition of the cut-off standardized in "V" over a large width.
  • FIG. 8b shows that the driving beam has an improved shape concentration spot.
  • any other type of headlamp comprising a lamp with two filaments, one of which is associated with a cup, in order to selectively produce a cut beam and an uncut beam.
  • the mirror designed according to the present invention may have in certain areas optical surfaces in which the ridges are superfluous.
  • decor streaks can be provided in these areas, that is to say streaks having no optical role but making it possible to obtain homogeneity appearance of the mirror.

Abstract

The lamp has two filaments, one forming a dipped beam (101), with a dished mask (103) producing this effect. The second filament is not masked, emitting light all round. The lamp has a glass enclosure and includes a mirror (200). This mirror has a upper zone (210), reflecting a dipped beam from the first filament, even without the dished mask. A second lateral zone (220) of the mirror reflects light from this filament, to the corresponding dished mask edge, producing another beam section. A third lower zone (230) of the mirror reflects the second filament, producing the main beam. The mirror glass is smooth, or lightly curved. The dipping may be defined by a horizontal half section and a another inclined to the horizontal. <IMAGE>

Description

La présente invention concerne d'une façon générale les projecteurs d'éclairage de véhicules automobiles.The present invention relates generally to motor vehicle lighting projectors.

Elle concerne plus particulièrement un nouveau projecteur équipé d'une lampe à deux filaments, dont l'un est dépourvu de coupelle d'occultation et permet d'engendrer un faisceau de route, et dont l'autre comporte une telle coupelle, pour engendrer un faisceau de croisement tel qu'un faisceau européen normalisé à coupure dite en "V". Une telle lampe peut être notamment une lampe normalisée dite "H4".It relates more particularly to a new headlamp equipped with a lamp with two filaments, one of which does not have a concealment cup and makes it possible to generate a driving beam, and the other of which includes such a cup, to generate a passing beam such as a European standard beam with "V" cut. Such a lamp can in particular be a standard lamp called "H4".

Une telle lampe est généralement associée à un miroir paraboloïdal, dont le foyer est placé entre les filaments de la lampe. Le projecteur comprend en outre une glace qui comporte des séries de prismes et/ou de stries de manière à assurer un étalement du faisceau généralement horizontalement et suivant la partie inclinée de la coupure, de manière à obtenir un bon confort d'éclairement et satisfaire aux règlements en matière de photométrie.Such a lamp is generally associated with a paraboloid mirror, the focus of which is placed between the filaments of the lamp. The headlamp further comprises a lens which comprises series of prisms and / or ridges so as to spread the beam generally horizontally and along the inclined part of the cut, so as to obtain good lighting comfort and satisfy the photometry regulations.

Par ailleurs, la Demanderesse a développé depuis quelques années des miroirs qui, associés à des filaments dépourvus de coupelle d'occultation, permettent d'engendrer des faisceaux tels qu'un faisceau de croisement européen, avec à la fois un bon respect de la coupure en "V" et un bon étalement latéral de la lumière. Dans ce cas, la glace peut être lisse ou pratiquement lisse, ce qui est avantageux tant sur le plan de son coût de revient que sur le plan esthétique. Le document FR-A-2 664 677 enseigne notamment un projecteur de ce type.Furthermore, the Applicant has developed for a few years mirrors which, associated with filaments devoid of a concealment cup, make it possible to generate beams such as a European passing beam, with both good respect for the cut in "V" shape and good lateral spreading of the light. In this case, the glass can be smooth or practically smooth, which is advantageous both in terms of its cost price and in aesthetic terms. Document FR-A-2 664 677 teaches in particular a projector of this type.

Cela étant, ce type de surface réfléchissante a pour vocation comme on l'a indiqué de coopérer avec un filament dépourvu de coupelle d'occultation, et est considérée a priori comme inintéressante lorsque le filament comporte une coupelle destinée à former la coupure. Or les lampes à deux filaments dont l'un est associé à une coupelle, et tout particulièrement les lampes normalisées "H4", continuent à être largement utilisées pour former principalement des projecteurs code/route.This being the case, this type of reflecting surface has the vocation, as has been indicated, of cooperating with a filament devoid of a concealment cup, and is considered a priori to be uninteresting when the filament comprises a cup intended to form the cut. Now, lamps with two filaments, one of which is associated with a cup, and very particularly the standard lamps "H4", continue to be widely used to form mainly code / route headlamps.

La présente invention est basée sur l'idée consistant à rechercher si les surfaces définies mathématiquement, telles qu'évoquées ci-dessus, pouvaient être utilisées avec profit avec une lampe de type "H4" ou équivalente, bien que rien n'y incite, et il a été découvert que, grâce à ce type de surface, la qualité du faisceau pouvait être grandement améliorée.The present invention is based on the idea of investigating whether the surfaces defined mathematically, as mentioned above, could be used with profit with a lamp of type "H4" or equivalent, although there is no incentive, and it has been discovered that, thanks to this type of surface, the quality of the beam can be greatly improved.

Ainsi la présente invention concerne un projecteur de véhicule automobile, du type comprenant une lampe à deux filaments, dont le premier est destiné à former un faisceau à coupure, une coupelle d'occultation y étant associée à cet effet, et dont le second est destiné à former un faisceau sans coupure et émet librement autour de lui, un miroir et une glace de fermeture, caractérisé en ce que :
   le miroir comprend une première zone s'étendant généralement dans la partie supérieure du miroir et apte à coopérer avec le premier filament pour engendrer par elle-même, sans intervention de la coupelle d'occultation, une partie de faisceau définissant au moins partiellement la coupure, une seconde zone s'étendant généralement dans une partie latérale du miroir et apte à coopérer avec le filament et un bord homologue de la coupelle d'occultation pour engendrer une partie de faisceau définissant une autre partie de la coupure, et une troisième zone s'étendant généralement dans la partie inférieure du miroir et apte à coopérer uniquement avec le second filament, et
   la glace est lisse ou faiblement déviatrice.Thus the present invention relates to a motor vehicle headlamp, of the type comprising a lamp with two filaments, the first of which is intended to form a cut-off beam, a concealment cup being associated therewith for this purpose, and the second of which is intended to form an unbroken beam and emits freely around it, a mirror and a closing glass, characterized in that:
the mirror comprises a first zone generally extending in the upper part of the mirror and able to cooperate with the first filament to generate by itself, without intervention of the obscuring cup, a beam part defining at least partially the cut , a second zone generally extending in a lateral part of the mirror and able to cooperate with the filament and a homologous edge of the concealment cup to generate a beam part defining another part of the cut, and a third zone s generally extending in the lower part of the mirror and able to cooperate only with the second filament, and
the ice is smooth or slightly deviating.

Des aspects préférés, mais non limitatifs, du projecteur de la présente invention sont les suivants :

  • la coupure est définie par une demi-coupure horizontale et une demi-coupure inclinée par rapport à l'horizontale, et la première zone du miroir est une zone apte à engendrer des images du premier filament situées au-dessous de ladite coupure et dont les points les plus hauts sont situés au voisinage de ladite coupure.
  • ladite première zone du miroir présente des profils horizontaux tels que la déviation horizontale impartie par ladite zone aux rayons issus d'un foyer de référence varie du centre de la première zone vers ses bords, cette déviation étant au moins localement nulle.
  • la deuxième zone est une portion de paraboloïde de révolution focalisée en arrière du premier filament.
  • alternativement, la deuxième zone du miroir ne forme pas de coupure dans la partie de faisceau engendrée et présente des profils horizontaux tels que la déviation horizontale impartie par ladite zone aux rayons issus d'un foyer de référence varie du centre de la première zone vers ses bords, cette déviation étant au moins localement nulle.
  • les première et deuxième zones du miroir se raccordent avec continuité au moins d'ordre zéro dans un plan de transition. Une transition discontinue reste cependant acceptable.
  • la troisième zone présente des profils horizontaux tels que la déviation horizontale impartie par ladite zone aux rayons issus d'un foyer de référence varie du centre de la première zone vers ses bords, cette déviation étant au moins localement nulle.
  • la première et la troisième zone se raccordent dans un premier plan de transition légèrement incliné vers le bas par rapport à un demi-plan horizontal axial du miroir correspondant à une première limite d'éclairement donnée par la coupelle d'occultation.
  • ce premier plan de transition est incliné vers le bas d'un angle compris entre 5 et 12°.
  • la première et la deuxième zone se raccordent dans un deuxième plan de transition, la deuxième et la troisième zone se raccordent dans un troisième plan de transition, et les deuxième et troisième plans de transition sont inclinés essentiellement symétriquement de part et d'autre d'un deuxième demi-plan horizontal axial, avec un angle légèrement supérieur à l'angle de relèvement de la demi-coupure inclinée.
  • l'angle d'inclinaison des deuxième et troisième plans de transition est de l'ordre de 15 à 25°.
  • il est prévu dans au moins une partie d'une zone du miroir dont le foyer de référence est situé à distance de l'un des filaments un ensemble de stries de rayon à plat progressivement variable, ces stries étant aptes à ramener vers le centre du faisceau des images des filaments décalées latéralement du fait de la défocalisation du filament en question.
  • l'ensemble du miroir comporte des stries orientées généralement verticalement.
  • la deuxième zone du miroir comporte des stries comportant une première portion s'étendant verticalement vers le bas à partir de la transition avec la première zone, et une deuxième portion s'étendant vers le haut avec une inclinaison par rapport à la verticale sensiblement égale à l'angle de relèvement de la demi-coupure inclinée, les première et deuxième portion de chaque strie se raccordant continûment dans une portion de raccordement, avec continuité d'ordre 1 ou 2.
Preferred, but not limiting, aspects of the projector of the present invention are as follows:
  • the cut is defined by a horizontal half cut and a half cut inclined with respect to the horizontal, and the first area of the mirror is an area capable of generating images of the first filament situated below of said cut and whose highest points are located in the vicinity of said cut.
  • said first area of the mirror has horizontal profiles such that the horizontal deviation imparted by said area to the rays from a reference focal point varies from the center of the first area towards its edges, this deviation being at least locally zero.
  • the second zone is a portion of paraboloid of revolution focused behind the first filament.
  • alternatively, the second zone of the mirror does not form a cut in the part of the beam generated and has horizontal profiles such that the horizontal deviation imparted by said zone to the rays coming from a reference focal point varies from the center of the first zone towards its edges, this deviation being at least locally zero.
  • the first and second zones of the mirror are connected with continuity of at least zero order in a transition plane. A discontinuous transition remains acceptable, however.
  • the third zone has horizontal profiles such that the horizontal deviation imparted by said zone to the radii from a reference focal point varies from the center of the first zone towards its edges, this deviation being at least locally zero.
  • the first and third zones are connected in a first transition plane slightly inclined downward with respect to an axial horizontal half-plane of the mirror corresponding to a first limit of illumination given by the occulting cup.
  • this first transition plane is inclined downward by an angle between 5 and 12 °.
  • the first and second zones join in a second transition plane, the second and third zones join in a third transition plane, and the second and third transition planes are inclined essentially symmetrically on either side of a second axial horizontal half-plane, with an angle slightly greater than the bearing angle of the inclined half-cut.
  • the angle of inclination of the second and third transition planes is of the order of 15 to 25 °.
  • there is provided in at least part of a region of the mirror, the reference focal point of which is located at a distance from one of the filaments, a set of streaks of gradually varying flat radius, these streaks being capable of bringing the center of the bundle of filament images shifted laterally due to the defocusing of the filament in question.
  • the entire mirror has streaks oriented generally vertically.
  • the second area of the mirror has ridges having a first portion extending vertically downward from the transition with the first area, and a second portion extending upward with an inclination relative to the vertical substantially equal to the angle of raising of the inclined half-cut, the first and second portions of each streak connecting continuously in a connection portion, with order 1 or 2 continuity.

D'autres aspects, buts et avantages de la présente invention apparaîtront mieux à la lecture de la description détaillée suivante de formes de réalisation préférées de celle-ci, donnée à titre d'exemple non limitatif et faite en référence au dessin annexé, sur lequel :

  • la figure 1 est une vue de face du miroir d'un projecteur selon la présente invention,
  • la figure 2 est une vue partielle en élévation de côté d'une lampe normalisée "H4" pouvant être utilisée dans le projecteur de la présente invention,
  • la figure 3 est une vue de face d'une variante préférée du miroir selon la présente invention, la figure 3'est une vue en perspective du miroir de la figure 3,
  • les figures 4a et 4b illustrent par des courbes isolux sur un écran de projection la partie de faiceau de croisement obtenue avec une première partie (211a et 211b) du miroir de la figure 1 et la même partie du miroir de la figure 3, respectivement,
  • les figures 5a et 5b illustrent par des courbes isolux sur un écran de projection la partie de faiceau de croisement obtenue avec une deuxième partie (220) du miroir de la figure 1 et la même partie du miroir de la figure 3, respectivement,
  • les figures 6a et 6b illustrent par des courbes isolux sur un écran de projection la partie de faiceau de croisement obtenue avec une troisième partie (212) du miroir de la figure 1 et la même partie du miroir de la figure 3, respectivement,
  • les figures 7a et 7b illustrent par des courbes isolux sur un écran de projection 1 faiceau de croisement globalement obtenu avec le miroir de la figure 1 et le miroir de la figure 3, respectivement, et
  • les figures 8a et 8b illustrent par des courbes isolux sur un écran de projection 1 faiceau de route globalement obtenu avec le miroir de la figure 1 et le miroir de la figure 3, respectivement.
Other aspects, aims and advantages of the present invention will appear better on reading the following detailed description of preferred embodiments thereof, given by way of nonlimiting example and made with reference to the appended drawing, in which :
  • FIG. 1 is a front view of the mirror of a projector according to the present invention,
  • FIG. 2 is a partial side elevation view of a standard lamp "H4" which can be used in the headlight of the present invention,
  • Figure 3 is a front view of a variant preferred mirror of the present invention, FIG. 3 is a perspective view of the mirror of FIG. 3,
  • FIGS. 4a and 4b illustrate by isolux curves on a projection screen the part of the crossing beam obtained with a first part (211a and 211b) of the mirror of FIG. 1 and the same part of the mirror of FIG. 3, respectively,
  • FIGS. 5a and 5b illustrate by isolux curves on a projection screen the part of the crossing beam obtained with a second part (220) of the mirror of FIG. 1 and the same part of the mirror of FIG. 3, respectively,
  • FIGS. 6a and 6b illustrate by isolux curves on a projection screen the part of the crossing beam obtained with a third part (212) of the mirror of FIG. 1 and the same part of the mirror of FIG. 3, respectively,
  • FIGS. 7a and 7b illustrate by isolux curves on a projection screen 1 crossing beam generally obtained with the mirror of FIG. 1 and the mirror of FIG. 3, respectively, and
  • FIGS. 8a and 8b illustrate by isolux curves on a projection screen 1 route beam generally obtained with the mirror of FIG. 1 and the mirror of FIG. 3, respectively.

On notera préliminairement que, d'une figure à l'autre, des éléments ou parties identiques ou similaires sont désignés dans la mesure du possible par les mêmes signes de référence.It will be noted at the outset that, from one figure to another, identical or similar elements or parts are designated as far as possible by the same reference signs.

On notera également que la description qui suit concerne un projecteur pour sens de circulation à droite. L'homme de l'art saura faire les adaptations nécessaires pour un sens de circulation à gauche.It will also be noted that the following description relates to a headlamp for right-hand traffic direction. Those skilled in the art will be able to make the necessary adaptations for a direction of left-hand traffic.

En référence tout d'abord aux figures 1 et 2, on a représenté un projecteur qui comprend un miroir 200 dans lequel est montée une lampe bifilament 100, dont un filament est pourvu d'une coupelle d'occultation. Il s'agit en l'espèce d'une lampe normalisée "H4" comportant un premier filament 101 pour faisceau de croisement, associé à une coupelle d'occultation 103, et à l'arrière du filament de croisement, et légèrement décalé vers le bas, un filament 102 pour faisceau de route, dépourvu de coupelle.Referring first to Figures 1 and 2, we have shown a projector which includes a mirror 200 in which is mounted a bifilament lamp 100, a filament of which is provided with a concealment cup. In this case, it is a standard lamp "H4" comprising a first filament 101 for passing beam, associated with a concealing cup 103, and behind the passing filament, and slightly offset towards the bottom, a filament 102 for driving beam, devoid of cup.

Une telle lampe est normalement destinée à coopérer avec un miroir de forme générale paraboloïdale, dont le foyer se situe quelque part entre les filaments, la forme de la coupelle, qui s'étend sur approximativement 165° autour du filament 101 au-dessous de celui-ci, déterminant une coupure en "V" européenne normalisée, avec un relèvement de l'angle de coupure δ typiquement de 15° dans la moitié droite du faisceau pour un sens de circulation à droite.Such a lamp is normally intended to cooperate with a generally paraboloidal mirror, the focus of which is located somewhere between the filaments, the shape of the cup, which extends over approximately 165 ° around the filament 101 below that -ci, determining a European standard "V" cutoff, with an increase in the cutoff angle δ typically 15 ° in the right half of the beam for a right-hand traffic direction.

Selon la présente invention, le miroir n'est pas un paraboloïde, mais il comporte principalement trois zones 210, 220, 230 que l'on va définir ci-dessous.According to the present invention, the mirror is not a paraboloid, but it mainly comprises three areas 210, 220, 230 which will be defined below.

La première zone 210 se situe généralement dans la partie supérieure du miroir, et est délimitée par deux plans axiaux, à savoir un plan P1 incliné légèrement vers le bas d'un angle noté α, au dessous du plan horizontal axial yOy, dans la partie gauche du miroir, et un plan P2 situé dans la partie droite du miroir et incliné vers le haut d'un angle noté β au-dessus du plan horizontal axial yOy.The first zone 210 is generally located in the upper part of the mirror, and is delimited by two axial planes, namely a plane P1 inclined slightly downwards by an angle denoted α, below the axial horizontal plane yOy, in the part left of the mirror, and a plane P2 located in the right part of the mirror and inclined upwards by an angle noted β above the horizontal axial plane yOy.

L'angle α est de préférence de quelques degrés (par exemple 5 à 12°).The angle α is preferably a few degrees (for example 5 to 12 °).

L'angle β est de préférence légèrement supérieur à δ, et par exemple de l'ordre de 15 à 25°.The angle β is preferably slightly greater than δ, and for example of the order of 15 to 25 °.

Le miroir 200 comprend une deuxième zone 220 occupant la région de droite du miroir (en vue de face) et s'étendant entre le plan P2 précité et un plan P3 constituant ici le symétrique du plan P2 par rapport au plan horizontal axial yOy. Les valeurs choisies pour les angles α et β permettent d'assurer que l'ensemble du rayonnement issu du filament de croisement 101 (dont la zone d'impact sur le miroir est illustrée par la zone non-hachurée sur la figure 1) rencontre de façon certaine la zone 210 ou la zone 220, selon les cas, en s'affranchissant au moins au niveau de la zone 220 des éventuels défauts de position du filament 101 ou de la coupelle 103.The mirror 200 comprises a second zone 220 occupying the right region of the mirror (in front view) and extending between the above-mentioned plane P2 and a plane P3 constituting here the symmetric of the plane P2 with respect to the axial horizontal plane yOy. The values chosen for the angles α and β ensure that all of the radiation coming from the crossing filament 101 (whose impact area on the mirror is illustrated by the non-hatched area in FIG. 1) meets zone 210 or zone 220, as the case may be, by avoiding at least at the level of zone 220 any possible positional defects of the filament 101 or of the cup 103.

Enfin le miroir comporte une troisième zone 230 s'étendant généralement dans la partie inférieure du miroir et délimitée par les plans P1 et P3. Elle est destinée à coopérer uniquement avec le filament de route 102 (auquel les zones 210 et 220 sont bien entendu également exposées).Finally, the mirror comprises a third zone 230 generally extending in the lower part of the mirror and delimited by the planes P1 and P3. It is intended to cooperate only with the road filament 102 (to which the areas 210 and 220 are of course also exposed).

La zone 210 du miroir est constituée dans le présent exemple par une surface réfléchissante définie mathématiquement et capable d'engendrer par elle même un faisceau d'une certaine largeur, d'une grande homogénéité et dont les images du filament sont toutes situées au-dessous d'une coupure européenne
normalisée (ligne hHc s^^^Erreur document^^^les figures 7a et 7b). De préférence, les points les plus hauts des images du filament sont situés au voisinage de la coupure. La largeur du faisceau (tout en conservant une concentration centrale) est obtenue, sans détériorer la coupure, en donnant à la surface des profils horizontaux tels que la déviation horizontale impartie à un rayon issue d'un foyer de référence varie progressivement du centre vers les bords, et est au moins localement nulle.The area 210 of the mirror is constituted in the present example by a reflecting surface defined mathematically and capable of generating by itself a beam of a certain width, of great homogeneity and the images of the filament of which are all located below of a European cut
normalized (line hHc s ^^^ Document error ^^^ Figures 7a and 7b). Preferably, the highest points of the images of the filament are located in the vicinity of the cut. The beam width (while retaining a central concentration) is obtained, without damaging the cut, by giving the surface horizontal profiles such that the horizontal deviation imparted to a ray from a reference focal point gradually varies from the center towards the edges, and is at least locally zero.

Une telle surface est définie mathématiquement en particulier par le document FR-A-2 664 677 au nom de la Demanderesse, auquel on se reportera pour davantage de détails.Such a surface is defined mathematically in particular by document FR-A-2 664 677 in the name of the Applicant, to which reference will be made for more details.

La position préférée du foyer de référence, noté Fc, de la surface réfléchissante de la zone 210 est illustrée sur la figure 2. Il se situe à quelques millimètres en arrière du filament de croisement 101.The preferred position of the reference focal point, denoted Fc, of the reflecting surface of the zone 210 is illustrated. in FIG. 2. It is located a few millimeters behind the crossing filament 101.

On a illustré sur les figures 6a et 4a la répartition lumineuse obtenue sur un écran de projection respectivement avec la sous-zone centrale 212 et avec la sous-zone latérale 211a ou 211b de la zone 210, respectivement.FIGS. 6a and 4a illustrate the light distribution obtained on a projection screen respectively with the central sub-area 212 and with the lateral sub-area 211a or 211b of the area 210, respectively.

La sous-zone 212, bien qu'elle engrendre des images du filament qui sont verticales et assez peu inclinées par rapport à la verticale, permet d'obtenir une partie de faisceau d'épaisseur limitée, définissant bien la demi-coupure de gauche ainsi que la tache de concentration centrale du faisceau (figure 4a).Sub-area 212, although it encapsulates images of the filament which are vertical and fairly slightly inclined relative to the vertical, makes it possible to obtain a portion of beam of limited thickness, clearly defining the left half-cut as well than the central beam concentration spot (Figure 4a).

Les sous-zones 211a et 211b engendrent des images du filament horizontales et assez peu inclinées par rapport à l'horizontale. La figure 6a montre que la partie de faisceau correspondante est relativement peu épaisse et présente un étalement important en largeur, avec une bonne homogénéité propice au confort visuel.Sub-areas 211a and 211b generate images of the filament that are horizontal and not very inclined relative to the horizontal. Figure 6a shows that the corresponding beam part is relatively thin and has a large spread in width, with good homogeneity conducive to visual comfort.

La zone 220 du miroir est destinée pour l'essentiel à contribuer, en coopération avec le bord correspondant de la coupelle d'occultation 103, à la formation de la demi-coupure inclinée à 15°, avec une bonne concentration de lumière au-dessous de cette demi-coupure au voisinage du centre de référence H. Cette zone 220 peut être formée par un secteur de paraboloïde de révolution coaxial avec le filament 101 et dont le foyer se trouve de préférence au voisinage du foyer de référence Fc illustré sur la figure 2. La figure 5a illustre la répartition lumineuse de la partie de faisceau obtenue.The zone 220 of the mirror is essentially intended to contribute, in cooperation with the corresponding edge of the obscuring cup 103, to the formation of the half-cut inclined at 15 °, with a good concentration of light below of this half-cut in the vicinity of the reference center H. This zone 220 can be formed by a paraboloid sector of revolution coaxial with the filament 101 and the focal point of which is preferably in the vicinity of the reference focal point Fc illustrated in the figure 2. Figure 5a illustrates the light distribution of the beam portion obtained.

En variante, la zone 220 peut être réalisée conformément au document FR-A-2 664 677 précité, de manière à donner en plus de la largeur à la partie de faisceau engendrée, tout en respectant la demi-coupure inclinée Hc qui est définie par le bord correspondant de la coupelle.As a variant, the zone 220 can be produced in accordance with the aforementioned document FR-A-2 664 677, so as to give, in addition to the width, the beam portion generated, while respecting the inclined half-cut Hc which is defined by the corresponding edge of the cup.

On observera ici que par conception appropriée des zones 210 et 220, on peut faire en sorte que leur raccordement au niveau du plan P2 s'effectue avec continuité, et de préférence avec continuité au second ordre. Une telle continuité au second ordre peut être obtenue par exemple par la technique décrite dans le document FR-A-2 634 003 au nom de la Demanderesse.It will be observed here that by appropriate design of the zones 210 and 220, it is possible to ensure that their connection at the level of the plane P2 takes place with continuity, and preferably with second order continuity. Such second order continuity can be obtained for example by the technique described in document FR-A-2 634 003 in the name of the Applicant.

Enfin la surface réfléchissante de la zone 230 du miroir est de préférence réalisée conformément aux enseignements du document FR-A précité. Dans un premier mode de réalisation, il s'agit d'une surface dont le profil horizontal est défini conformément à ce document mais dont le profil vertical n'engendre pas de coupure. Dans un deuxième mode, il peut s'agir d'une surface engendrant une coupure. La position préférée du foyer de référence de la troisième zone 230 est indiquée en Fr sur la figure 2.Finally, the reflecting surface of the area 230 of the mirror is preferably produced in accordance with the teachings of the aforementioned document FR-A. In a first embodiment, it is a surface whose horizontal profile is defined in accordance with this document but whose vertical profile does not cause cutting. In a second mode, it may be a surface causing a cut. The preferred position of the reference zone of the third zone 230 is indicated at Fr in FIG. 2.

On observera ici que du fait du décalage entre les foyers Fc et Fr, il existe une discontinuité entre la zone 230 et les zones 210 et 220 au niveau des plans de transition P1 et P3. Dans la mesure où ces régions de transition sont occultées par la coupelle 103 lorsque le filament de croisement 101 est allumé, cette discontinuité ne risque nullement de provoquer des anomalies optiques (rayons remontants susceptibles d'éblouir les conducteurs des véhicules roulant en sens inverse).It will be observed here that due to the offset between the foci Fc and Fr, there is a discontinuity between the zone 230 and the zones 210 and 220 at the level of the transition planes P1 and P3. Insofar as these transition regions are obscured by the cup 103 when the crossing filament 101 is lit, this discontinuity in no way risks causing optical anomalies (rising rays likely to dazzle drivers of vehicles traveling in the opposite direction).

La figure 7a illustre le faisceau de croisement globalement obtenu, sans glace de fermeture, avec le miroir décrit ci-dessus. La figure 8a illustre le faisceau de route obtenu, toujours sans glace de fermeture. Du fait que ce faisceau présente largeur et homogénéité, le travail par la glace peut s'avérer superflu, et celle-ci peut être lisse ou faiblement déviatrice.FIG. 7a illustrates the globally obtained passing beam, without closing glass, with the mirror described above. FIG. 8a illustrates the driving beam obtained, still without closing glass. Because this beam has width and homogeneity, work by the glass may prove to be superfluous, and the latter may be smooth or slightly deflecting.

Dans une variante de réalisation de l'invention, les diverses zones 210, 220 et 230 du miroir 200 peuvent être équipées de stries destinées à améliorer encore l'homogénéité du faisceau. Les figures 3 et 3' illustrent un tel miroir. Les stries S1 et S3 situées respectivement dans les zones 210 et 230 sont de préférence toutes verticales. Les stries S2 situées dans la zone 220 sont de préférence constituées chacune d'une portion verticale S2a s'étendant vers le bas à partir du plan de transition P2, et d'une portion S2b ayant une inclinaison de 10 à 20° par rapport à la verticale, s'étendant vers le haut à partir du plan de transition P3. De façon préférée, ces portions de stries se raccordent les unes aux autres de façon continue par des zones de raccordement courbes S2c.In an alternative embodiment of the invention, the various zones 210, 220 and 230 of the mirror 200 can be equipped with ridges intended to further improve the homogeneity of the beam. Figures 3 and 3 'illustrate such a mirror. The streaks S1 and S3 located respectively in the zones 210 and 230 are preferably all vertical. The streaks S2 situated in the zone 220 preferably each consist of a vertical portion S2a extending downward from the transition plane P2, and of a portion S2b having an inclination of 10 to 20 ° relative to vertical, extending upward from the transition plane P3. Preferably, these streak portions are connected to each other continuously by curved connection zones S2c.

Selon une autre caractéristique, ces stries sont conçues à plat, zone par zone, avec des rayons de stries qui peuvent évoluer de façon progressive sur leur longueur, en fonction de la déviation recherchée, et ensuite projetées sur la surface réfléchissante du miroir.According to another characteristic, these streaks are designed flat, zone by zone, with rays of streaks which can change progressively over their length, depending on the deviation sought, and then projected onto the reflecting surface of the mirror.

Un objectif de ces stries est d'atténuer le défaut de lumière au-dessous du centre de référence H (voir figure 7a), défaut de lumière dû à la défocalisation importante de la source par rapport au foyer Fc des zones 210 et 220.One objective of these streaks is to attenuate the light defect below the reference center H (see FIG. 7a), light defect due to the significant defocusing of the source with respect to the focal point Fc of zones 210 and 220.

La figure 3 illustre un exemple préféré d'agencement des différentes stries. Chaque strie peut présenter deux rayons différents à ses deux extrémités. Dans ce cas, ce rayon varie continûment entre lesdites extrémités.FIG. 3 illustrates a preferred example of arrangement of the different streaks. Each streak can have two different rays at its two ends. In this case, this radius varies continuously between said ends.

Les figures 4b à 8b sont les homologues des figures 4a à 8a, obtenues avec le miroir strié tel que défini ci-dessus.Figures 4b to 8b are the counterparts of Figures 4a to 8a, obtained with the ridged mirror as defined above.

On observe sur la figure 4b l'étalement horizontal obtenu, et surtout le comblement du défaut de lumière au centre apparaissant sur la figure 4a. En effet les stries de la sous-zone 211a, 211b sont conçues pour en partie ramener vers le centre des images du filament présentes en abondance de part et d'autre de "l'encoche" sans lumière visible sur la figure 4a.We observe in Figure 4b the horizontal spread obtained, and especially the filling of the light defect in the center appearing in Figure 4a. Indeed the streaks of the sub-area 211a, 211b are designed to partially bring towards the center images of the filament present in abundance on either side of the "notch" without visible light in FIG. 4a.

La figure 5b montre que, grâce au stries S2 à double inclinaison, la lumière est étalée d'une part le long de la demi-coupure inclinée Hc (grâce aux portions de stries inclinées à environ 15°), et d'autre part le long de la demi-coupure horizontale (grâce aux portions de stries verticales).FIG. 5b shows that, thanks to the S2 double-inclination streaks, the light is spread on the one hand along the inclined half-cut Hc (thanks to the streak portions inclined at about 15 °), and on the other hand along the horizontal half-cut (thanks to the vertical streak portions).

La figure 6b montre aussi que le défaut de lumière apparaîssant dans la région centrale de la figure 6a a été comblé.Figure 6b also shows that the light defect appearing in the central region of Figure 6a has been filled.

Enfin la figure 7b montre, en résultat de tout ce qui précède, une tache de concentration centrale de forme et d'homogénéité excellentes, et une très bonne définition de la coupure normalisée en "V" sur une largeur importante.Finally, FIG. 7b shows, as a result of all of the above, a spot of central concentration of excellent shape and homogeneity, and a very good definition of the cut-off standardized in "V" over a large width.

De même, la figure 8b montre que le faisceau de route présente une tache de concentration de forme améliorée.Likewise, FIG. 8b shows that the driving beam has an improved shape concentration spot.

Bien entendu, la présente invention n'est nullement limitée aux formes de réalisation décrites et représentées, mais l'homme de l'art saura y apporter toute variante ou modification conforme à son esprit.Of course, the present invention is not limited to the embodiments described and shown, but those skilled in the art will be able to make any variant or modification in accordance with his spirit.

En particulier, elle peut être appliquée à tout autre type de projecteur comportant une lampe à deux filaments dont, l'un est associé à une coupelle, en vue de produire sélectivement un faisceau coupé et un faisceau non coupé.In particular, it can be applied to any other type of headlamp comprising a lamp with two filaments, one of which is associated with a cup, in order to selectively produce a cut beam and an uncut beam.

Par ailleurs, on peut se reporter également aux documents FR-A-2 639 888, FR-A-2 609 146 et FR-A-2 609 148 au nom de la Demanderesse, qui décrivent également des surfaces réfléchissantes capables en elles-mêmes d'engendrer des faisceaux larges et pour certaines respectant une certaine coupure.. Les techniques qui y sont décrites peuvent également être utilisées dans un projecteur selon la présente invention.Furthermore, reference may also be made to documents FR-A-2 639 888, FR-A-2 609 146 and FR-A-2 609 148 in the name of the Applicant, which also describe reflective surfaces capable in themselves to generate wide beams and some respecting a certain cutoff. The techniques described therein can also be used in a projector according to the present invention.

On observera pour terminer que le miroir conçu selon la présente invention peut présenter dans certaines zones des surfaces optiques dans lesquelles les stries sont superflues. Dans ce cas, on peut prévoir dans ces zones des stries de décor, c'est à dire des stries n'ayant pas de rôle optique mais permettant d'obtenir une homogénéité d'aspect du miroir.Finally, it will be observed that the mirror designed according to the present invention may have in certain areas optical surfaces in which the ridges are superfluous. In this case, decor streaks can be provided in these areas, that is to say streaks having no optical role but making it possible to obtain homogeneity appearance of the mirror.

Claims (14)

Projecteur de véhicule automobile, du type comprenant une lampe (100) à deux filaments (101, 102), dont le premier (101) est destiné à former un faisceau à coupure, une coupelle d'occultation (103) y étant associée à cet effet, et dont le second (102) est destiné à former un faisceau sans coupure et émet librement autour de lui, un miroir (200) et une glace de fermeture, caractérisé en ce que:
   le miroir comprend une première zone (210) s'étendant généralement dans la partie supérieure du miroir et apte à coopérer avec le premier filament pour engendrer par elle-même, sans intervention de la coupelle d'occultation, une partie de faisceau définissant au moins partiellement la coupure, une seconde zone (220) s'étendant généralement dans une partie latérale du miroir et apte à coopérer avec le filament et un bord homologue de la coupelle d'occultation pour engendrer une partie de faisceau définissant une autre partie de la coupure, et une troisième zone (230) s'étendant généralement dans la partie inférieure du miroir et apte à coopérer uniquement avec le second filament, et
   la glace est lisse ou faiblement déviatrice.Motor vehicle headlamp, of the type comprising a lamp (100) with two filaments (101, 102), the first of which (101) is intended to form a cut-off beam, a concealment cup (103) being associated therewith effect, and the second of which (102) is intended to form an unbroken beam and freely emits around it, a mirror (200) and a closing glass, characterized in that:
the mirror comprises a first zone (210) generally extending in the upper part of the mirror and able to cooperate with the first filament to generate by itself, without intervention of the obscuring cup, a beam part defining at least partially the cut, a second zone (220) generally extending in a lateral part of the mirror and able to cooperate with the filament and a homologous edge of the blackout cup to generate a part of the beam defining another part of the cut , and a third zone (230) generally extending in the lower part of the mirror and able to cooperate only with the second filament, and
the ice is smooth or slightly deviating. Projecteur selon la revendication 1, caractérisé en ce que la coupure est définie par une demi-coupure horizontale (hH) et une demi-coupure (Hc) inclinée par rapport à l'horizontale, et en ce que la première zone (210) du miroir est une zone apte à engendrer des images du premier filament situées au-dessous de ladite coupure et dont les points les plus hauts sont situés au voisinage de ladite coupure.Projector according to claim 1, characterized in that the cut-off is defined by a horizontal half-cut (hH) and a half-cut (Hc) inclined with respect to the horizontal, and in that the first zone (210) of the mirror is an area capable of generating images of the first filament located below said cut and the highest points of which are located in the vicinity of said cut. Projecteur selon la revendication 2, caractérisé en ce que ladite première zone (210) du miroir présente des profils horizontaux tels que la déviation horizontale impartie par ladite zone aux rayons issus d'un foyer de référence varie du centre de la première zone vers ses bords, cette déviation étant au moins localement nulle.Projector according to claim 2, characterized in that said first zone (210) of the mirror has horizontal profiles such that the horizontal deviation imparted by said zone to the rays coming from a reference focal point varies from the center of the first zone towards its edges , this deviation being at least locally zero. Projecteur selon la revendication 2 ou 3, caractérisé en ce que la deuxième zone (220) est une portion de paraboloïde de révolution focalisée en arrière du premier filament (101).Projector according to claim 2 or 3, characterized in that the second zone (220) is a portion of paraboloid of revolution focused behind the first filament (101). Projecteur selon la revendication 2 ou 3, caractérisé en ce que la deuxième zone (220) du miroir ne forme pas de coupure dans la partie de faisceau engendrée et présente des profils horizontaux tels que la déviation horizontale impartie par ladite zone aux rayons issus d'un foyer de référence (Fc) varie du centre de la première zone vers ses bords, cette déviation étant au moins localement nulle.Projector according to claim 2 or 3, characterized in that the second zone (220) of the mirror does not form a cut in the part of the beam generated and has horizontal profiles such as the horizontal deviation imparted by said zone to rays from a reference focus (Fc) varies from the center of the first zone towards its edges, this deviation being at least locally zero. Projecteur selon la revendication 5, caractérisé en ce que les première et deuxième zones (210, 220) du miroir se raccordent avec continuité au moins d'ordre zéro dans un plan de transition (P2).Projector according to claim 5, characterized in that the first and second zones (210, 220) of the mirror are connected with continuity of at least zero order in a transition plane (P2). Projecteur selon l'une des revendications 2 à 6, caractérisé en ce que la troisième zone (230) présente des profils horizontaux tels que la déviation horizontale impartie par ladite zone aux rayons issus d'un foyer de référence (Fr) varie du centre de la première zone vers ses bords, cette déviation étant au moins localement nulle.Projector according to one of claims 2 to 6, characterized in that the third zone (230) has horizontal profiles such that the horizontal deviation imparted by said zone to the rays coming from a reference focal point (Fr) varies from the center of the first zone towards its edges, this deviation being at least locally zero. Projecteur selon l'une des revendications 2 à 6, caractérisé en ce que la première et la troisième zone (210, 230) se raccordent dans un premier plan de transition (P1) légèrement incliné vers le bas par rapport à un demi-plan horizontal axial (Oy) du miroir correspondant à une première limite d'éclairement donnée par la coupelle d'occultation (103).Projector according to one of Claims 2 to 6, characterized in that the first and third zones (210, 230) are connected in a first transition plane (P1) slightly inclined downwards with respect to an axial horizontal half-plane (Oy) of the mirror corresponding to a first illumination limit given by the occultation cup (103). Projecteur selon la revendication 8, caractérisé en ce que ledit premier plan de transition (P1) est incliné vers le bas d'un angle compris entre 5 et 12°.Projector according to claim 8, characterized in that said first transition plane (P1) is inclined downward by an angle between 5 and 12 °. Projecteur selon l'une des revendications 8 et 9, caractérisé en ce que la première et la deuxième zone (210, 220) se raccordent dans un deuxième plan de transition (P2), en ce que la deuxième et la troisième zone (220, 230) se raccordent dans un troisième plan de transition (P3), et en ce que les deuxième et troisième plans de transition sont inclinés essentiellement symétriquement de part et d'autre d'un deuxième demi-plan horizontal axial, avec un angle (β) légèrement supérieur à l'angle (δ) de relèvement de la demi-coupure inclinée.Projector according to either of Claims 8 and 9, characterized in that the first and the second zone (210, 220) are connected in a second transition plane (P2), in that the second and the third zone (220, 230) are connected in a third transition plane (P3), and in that the second and third transition planes are inclined essentially symmetrically on either side of a second axial horizontal half-plane, with an angle (β ) slightly greater than the angle (δ) of raising the inclined half-cut. Projecteur selon la revendication 10, caractérisé en ce que l'angle d'inclinaison (β) des deuxième et troisième plans de transition est de l'ordre de 15 à 25°.Projector according to claim 10, characterized in that the angle of inclination (β) of the second and third transition planes is of the order of 15 to 25 °. Projecteur selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu dans au moins une partie d'une zone du miroir dont le foyer de référence est situé à distance de l'un des filaments un ensemble de stries (S1, S2, S3) de rayons à plat progressivement variables, ces stries étant aptes à ramener vers le centre du faisceau des images des filaments décalées latéralement du fait de la défocalisation du filament en question.Projector according to one of the preceding claims, characterized in that it is provided in at least part of a region of the mirror, the reference focus of which is located at a distance from one of the filaments, a set of ridges (S1, S2, S3) of progressively variable flat radii, these streaks being able to bring back towards the center of the beam images of the filaments shifted laterally due to the defocusing of the filament in question. Projecteur selon la revendication 12, caractérisé en ce que l'ensemble du miroir (200) comporte des stries orientées généralement verticalement.Projector according to claim 12, characterized in that the assembly of the mirror (200) has grooves oriented generally vertically. Projecteur selon la revendication 12 ou 13 prise en combinaison avec la revendication 4 ou 5, caractérisé en ce que la deuxième zone (220) du miroir comporte des stries (S2) comportant une première portion (S2a) s'étendant verticalement vers le bas à partir de la transition avec la première zone, et une deuxième portion (S2b) s'étendant vers le haut avec une inclinaison par rapport à la verticale sensiblement égale à l'angle de relèvement de la demi-coupure inclinée, les première et deuxième portion de chaque strie se raccordant continûment dans une portion de raccordement (S2c).Projector according to claim 12 or 13 taken in combination with claim 4 or 5, characterized in that the second zone (220) of the mirror has ridges (S2) comprising a first portion (S2a) extending vertically downwards from the transition with the first zone, and a second portion (S2b) extending upward with an inclination relative to the vertical substantially equal to the bearing angle of the inclined half-cut, the first and second portion of each streak connecting continuously in a connecting portion (S2c).
EP95401203A 1994-05-26 1995-05-23 Headlamp comprising a double filament lamp for low and high beam distribution Expired - Lifetime EP0684420B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9406376A FR2720476B1 (en) 1994-05-26 1994-05-26 Projector comprising a lamp with two filaments to generate a cut beam and an uncut beam.
FR9406376 1994-05-26

Publications (2)

Publication Number Publication Date
EP0684420A1 true EP0684420A1 (en) 1995-11-29
EP0684420B1 EP0684420B1 (en) 1999-09-08

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EP95401203A Expired - Lifetime EP0684420B1 (en) 1994-05-26 1995-05-23 Headlamp comprising a double filament lamp for low and high beam distribution

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EP (1) EP0684420B1 (en)
DE (1) DE69511935T2 (en)
FR (1) FR2720476B1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2744518A1 (en) * 1996-02-01 1997-08-08 Bosch Gmbh Robert LONG-RANGE HEADLIGHT FOR MOTOR VEHICLES
EP0791779A2 (en) * 1996-02-23 1997-08-27 Hella KG Hueck & Co. Motor vehicle headlamp for dipped and main beam and lamp
DE19747314A1 (en) * 1996-11-08 1998-05-14 Valeo Vision Motor vehicle headlamp with multi-zone reflector
DE19805216A1 (en) * 1997-02-21 1998-08-27 Valeo Vision Vehicle headlamp with two filaments forming beams with and without light dark boundary
FR2762380A1 (en) * 1997-04-18 1998-10-23 Autopal Np PROJECTOR FOR MOTOR VEHICLE
DE19718336A1 (en) * 1997-04-30 1998-11-05 Hella Kg Hueck & Co Reflector for a vehicle headlight
FR2782149A1 (en) * 1998-08-10 2000-02-11 Valeo Vision Dipped and full beam headlamp assembly includes dual filament lamp with multiple zone mirror offering cut-off beam and full axial beam
FR2782148A1 (en) * 1998-08-10 2000-02-11 Valeo Vision Automobile headlight for main and dipped beam functions, comprises two-filament lamp with masked dipped beam filament, and reflector configured to support both operating modes
AT413753B (en) * 1999-08-16 2006-05-15 Zizala Lichtsysteme Gmbh VEHICLE HEADLIGHTS
EP1382900B2 (en) † 2002-07-15 2009-10-21 Valeo Vision Motor vehicle headlamp with a double filament lamp

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2760067B1 (en) * 1997-02-21 1999-05-14 Valeo Vision MOTOR VEHICLE HEADLIGHT WITH MIRROR WITH LATERALLY JUXTAPOSED ZONES, AND METHOD FOR MANUFACTURING SUCH A MIRROR
FR2818210B1 (en) 2000-12-20 2003-04-11 Valeo Vision ROTATING PROJECTOR FOR A MOTOR VEHICLE COMPRISING A TWO-SOURCE LAMP
DE102012006505A1 (en) * 2012-03-29 2013-10-02 GM Global Technology Operations LLC (n.d. Ges. d. Staates Delaware) Scattered lens for a headlight

Citations (3)

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DE3742191A1 (en) * 1987-12-12 1989-06-22 Hella Kg Hueck & Co Dippable vehicle headlight (headlamp)
US5055981A (en) * 1989-02-17 1991-10-08 Koito Manufacturing Co., Ltd. Automotive projector type headlight
EP0581679A1 (en) * 1992-07-30 1994-02-02 Valeo Vision Vehicle headlamp comprising a double filament lamp for selectively producing a fog beam und a high beam

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3742191A1 (en) * 1987-12-12 1989-06-22 Hella Kg Hueck & Co Dippable vehicle headlight (headlamp)
US5055981A (en) * 1989-02-17 1991-10-08 Koito Manufacturing Co., Ltd. Automotive projector type headlight
EP0581679A1 (en) * 1992-07-30 1994-02-02 Valeo Vision Vehicle headlamp comprising a double filament lamp for selectively producing a fog beam und a high beam

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2744518A1 (en) * 1996-02-01 1997-08-08 Bosch Gmbh Robert LONG-RANGE HEADLIGHT FOR MOTOR VEHICLES
EP0791779A2 (en) * 1996-02-23 1997-08-27 Hella KG Hueck & Co. Motor vehicle headlamp for dipped and main beam and lamp
EP0791779A3 (en) * 1996-02-23 1999-02-10 Hella KG Hueck & Co. Motor vehicle headlamp for dipped and main beam and lamp
DE19747314A1 (en) * 1996-11-08 1998-05-14 Valeo Vision Motor vehicle headlamp with multi-zone reflector
DE19747314B4 (en) * 1996-11-08 2014-05-22 Valeo Vision Motor vehicle headlight with a discharge lamp with cover elements and a multi-zone reflector
DE19805216A1 (en) * 1997-02-21 1998-08-27 Valeo Vision Vehicle headlamp with two filaments forming beams with and without light dark boundary
FR2762380A1 (en) * 1997-04-18 1998-10-23 Autopal Np PROJECTOR FOR MOTOR VEHICLE
DE19718336A1 (en) * 1997-04-30 1998-11-05 Hella Kg Hueck & Co Reflector for a vehicle headlight
FR2782149A1 (en) * 1998-08-10 2000-02-11 Valeo Vision Dipped and full beam headlamp assembly includes dual filament lamp with multiple zone mirror offering cut-off beam and full axial beam
FR2782148A1 (en) * 1998-08-10 2000-02-11 Valeo Vision Automobile headlight for main and dipped beam functions, comprises two-filament lamp with masked dipped beam filament, and reflector configured to support both operating modes
AT413753B (en) * 1999-08-16 2006-05-15 Zizala Lichtsysteme Gmbh VEHICLE HEADLIGHTS
EP1382900B2 (en) † 2002-07-15 2009-10-21 Valeo Vision Motor vehicle headlamp with a double filament lamp

Also Published As

Publication number Publication date
FR2720476A1 (en) 1995-12-01
FR2720476B1 (en) 1996-08-09
EP0684420B1 (en) 1999-09-08
DE69511935T2 (en) 2000-01-20
DE69511935D1 (en) 1999-10-14

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