EP0933586B1 - Vehicle headlight comprising a transversal source and able to generate a V-shaped cut-off - Google Patents

Vehicle headlight comprising a transversal source and able to generate a V-shaped cut-off Download PDF

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Publication number
EP0933586B1
EP0933586B1 EP99400185A EP99400185A EP0933586B1 EP 0933586 B1 EP0933586 B1 EP 0933586B1 EP 99400185 A EP99400185 A EP 99400185A EP 99400185 A EP99400185 A EP 99400185A EP 0933586 B1 EP0933586 B1 EP 0933586B1
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EP
European Patent Office
Prior art keywords
source
reflector
zone
headlight according
mirror
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99400185A
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German (de)
French (fr)
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EP0933586A1 (en
Inventor
Benoít Reiss
Pierre Albou
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Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Publication of EP0933586A1 publication Critical patent/EP0933586A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/155—Surface emitters, e.g. organic light emitting diodes [OLED]
    • 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
    • F21S41/168—Incandescent light sources, e.g. filament or halogen lamps having a filament arranged transversally to the optical axis of the illuminating device
    • 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
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light

Definitions

  • the present invention relates generally motor vehicle headlamps, and more precisely a projector capable of transmitting breaking beam, of which at least part of the cut has an oblique inclination, typically at 15 °, with respect to the horizontal.
  • Such a break is for example that defined by European regulations in this area, and includes, for a direction of traffic on the right, a half-cut on the left horizontal and a half straight cut raised by 15 ° above from the horizontal.
  • Such an orientation is intended in particular to to make projectors whose mirror presents a dimension in height at least equal, or even substantially greater, in its width dimension.
  • FR-A-2 602 305 describes a description of a mirror adapted to cooperate with a transverse source for generate a fog beam
  • FR-A-2 602 306 the description of a mirror capable of cooperating selectively with two cross-sectional sources for generating respectively a passing beam and a road beam in accordance with the regulations of the United States America, the passing beam being delimited by a cut formed by two horizontal half-planes offset in height.
  • FR 2657680 discloses a projector with a transverse source and a mirror whose surfaces generate images having all possible directions. An oblique cut is obtained by positioning these images along the line to train.
  • the present invention offers a vehicle headlamp automobile as defined in claim 1.
  • a mirror 20 for projecting to infinity a light beam of light, this mirror receiving at its bottom a light source consisting of the species by the generally cylindrical filament 10 an incandescent lamp.
  • the axis of the filament 10 is perpendicular to the optical axis of the mirror 20, which is itself perpendicular to the plane of the leaf, and the axis the filament extends in this case horizontally.
  • each point of the mirror 20 is generate an image of the source 10 whose orientation, in a projection plane perpendicular to the axis optical mirror, will depend on the coordinates of this point.
  • a first element of the approach leading to the The present invention consists in locating on the surface of the mirror the points that generate images of the source having the same inclination with respect to the horizontal, and in this case an inclination of 15 ° in the direction of anticlockwise rotation, so that positioning these images appropriately, least part of the half-cut inclined at 15 ° of a standardized European passing beam.
  • FIG. 1 illustrates in a rear elevational view the school case of a mirror 20 having a reflective surface in the form of a paraboloid of revolution focused in the center of a transverse filament 10, and it has been identified on this surface.
  • a certain number of lines of points of the surface (L N ) generating images whose major axes all have the same inclination of N degrees with respect to the horizontal.
  • lines L 15 are lines L 15 corresponding to inclinations of images of the source oriented at 15 ° in one direction or the other with respect to the horizontal.
  • FIG. 2 illustrates, in the rear view, a quarter of a mirror 20, which consists of a piece of paraboloid focused behind the filament 10 and laterally with respect thereto, as well as the lines L 15 of iso-inclination 15 ° images.
  • Figure 3 illustrates the horizontal generatrix of this quarter mirror, as well as the position of the focus F.
  • a zone Z of the mirror surrounding the line L15 will allow, with the above-described parabolic surface, to generate images of the filament which, in a projection screen, will rotate around their edge homologous side of the filament edge on which the focus and within angular boundaries located on both sides the value of 15 °, these images being located at right of the reference center of the screen.
  • Such a surface is therefore suitable for initiating the ascending cut at 15 °, and at the same time to create a concentration spot immediately below this cut, as it is will see in detail later in an embodiment concrete of the present invention.
  • FIGS. 4 and 5 which illustrate a mirror / filament set that we are going to apply the cut-off according to the invention, we have represented the cylindrical filament 10, which can typically be made of either the transverse filament a standard lamp H3 mounted axially at the bottom of the mirror, the axial filament of an H1 or H7 lamp mounted laterally in the mirror.
  • Vertical generators high and low, respectively 20h and 20b, of the mirror 20 are designed to way to bring all the images of filament 10 underneath and essentially flush with the horizontal level, in order to be able to engender, as will be seen in detail further on, clusters net cut of good quality.
  • these vertical generators are constructed by drawing straight lines D1 tangent to the filament surface 10, these lines lying on the back of the filament with respect to the generator upper 20h, and lying on the front side of the filament for the generator 20b.
  • each of these lines D1 corresponding to a light beam emitted by an edge of the filament 10, are respectively associated straight lines D2 parallel to the optical axis y-y of the mirror, which itself is substantially parallel to the axis of the vehicle.
  • Each generator is built from close to near, from the bottom of the mirror 20 that is fixed to a predetermined dimension with respect to the filament, from different TG lines obtained, to define a curved line, which will be called in the following "Evolutionary generator” in so far as it does not not have a fixed focus, but a set of hearths which evolve progressively as one moves along said generator.
  • These generators are distinguished in this respect from fixed-focus generators, that is to say parabolic, described above.
  • Figure 6 illustrates the arrangement of the images, aligned below and flush with the horizontal plane, obtained with a mirror 20 having the generator vertical described above and a generator horizontal with some defocusing by to the source 10. These images define a horizontal cut of very good sharpness.
  • FIG. a concrete embodiment of a mirror defined with the vertical generator described above with reference to Figure 4, but likely to generate by itself, that is without the intervention of ice cream closure, a European-type passing beam having the required horizontal width. It is generated by dividing the mirror 20 into different areas as shown in Figure 7.
  • the mirror has a half upper 21 and a lower half 22, which comprise each nine areas, respectively 211 to 219 and 221 to 229.
  • the different zones have relatively similar widths, and typically between 6 and 13 mm, and are characterized for the main thing by horizontal generators different, defined according to the lateral shift and of the desired spreading of the light.
  • central zones 215 and 225 that generate images of filament 10 that are horizontal or very slightly inclined to the horizontal are intended to realize the horizontal cut on an extent important.
  • Their horizontal generatrix is advantageously a straight line.
  • the zones 214 and 226 are those which are designed according to the principles explained above with reference to FIGS. 1 to 3, and respectively encompass the greater part of two iso-inclination lines L 15 so as to generate images of the filament which are parallel or moderately inclined with respect to the typical 15 ° half-cut of a European passing beam.
  • zones 214, 226 consist of pieces of parables, or with horizontal and vertical generators of different homes (the home position of the generator horizontal determining in particular the positioning symmetrical or otherwise asymmetrical images by relative to the axial vertical plane passing through the center of reference of the projection screen), ie again and preferably having a horizontal generatrix parabolic and a scalable vertical generator such as described above with reference to FIG.
  • Figures 8 and 9 illustrate the case where the zone 214 is a surface generated by dragging the vertical generator of Figure 4, in such a way that it stays parallel to the plane y0z, on a generator horizontal constituted by a piece of parabola whose F hearth is located behind the filament 10, and to the right from its center.
  • Figures 11 and 12 illustrate the case where the piece of parabola defining the generator horizontal of zone 214 has an O'y axis offset laterally with respect to the main axis 0y of the mirror, so that the focus F is brought closer to the lateral end of the filament 10 opposite the side in which is zone 214, while the generator vertical is always of the type illustrated in the Figure 4.
  • the resulting images are illustrated on the Figure 13, and it is observed that the lateral shift of the focus F creates a shift of images on the half-cut side inclined Hc, as well as a concentration spot below this half-cut Hc, so as to better illuminate the side of the road.
  • zone 226, having the same role, located in the lower half of the mirror.
  • zone 226, F homes positioned differently, one being able to find for example at the right of a point located between the center of the filament and one of its edges, and the other may be outside this same edge.
  • the area 214 can be expected to realize the area 214 by giving him a base area located in the continuity, and with the same equations, as the surfaces adjacent areas of the mirror, as we go describe further, and by applying on these surfaces of base, by projection along the Oy axis, elements correcting optics such as prisms and the case appropriate streaks to position the images as indicated.
  • Another solution is to make area 214 with a surface extending in continuity with those adjacent areas, and planning in the area of the closing glass which is homologous to zones 214, 226 of the mirror of the prisms and where appropriate streaks having the same function as those projected on the mirror as indicated above.
  • the other zones of the mirror 20 of FIG. used to ensure a light distribution satisfactory light in the different areas of the beam.
  • central areas are 215, 225 present the vertical generator as described with reference to FIG. 2, the other zones may possibly present, depending on the function that assigned to them, surfaces of different types, and including surfaces derived from the teachings of documents FR-A-2 536 502, FR-A-2 536 503, FR-A-2 602 305, FR-A-2,602,306, FR-A-2,609,146, FR-A-2,609,148, FR-A-2 639 888, FR-A-2 664 677 and FR-A-2 710 393, in the name of Applicant.
  • Figures 14 to 22 illustrate by sets of curves isocandela the beam parts that are by example generated by the zones 214, 213, 212, 211, 216, 217, 218, 219 and 215 of the mirror of Figure 7, while FIGS. 23 and 24 illustrate the shape obtained in superimposing respectively the beam portions of Figures 14 to 17 and the beam portions of Figures 18 at 21.
  • Figure 25 illustrates the pace of the game of beam generated by the upper half of the mirror of Figure 11, while Figure 26 illustrates the pace of the beam part generated by his half lower.
  • Figure 27 illustrates the pace of the beam globally obtained. It is observed that this is a beam having all the qualities required in terms of width, thickness and concentration in the axis of the road.
  • the present invention enables to achieve, through the use of a cross-sectional source and the different areas as described above, mirrors for European passing beam whose width is substantially less than the height.
  • the ratio between height and width can be between 1.2: 1 and 4: 1.
  • the present invention also applies to a projector according to another concrete embodiment of the invention, which will now be described in reference to Figures 28 to 31.
  • Figures 28 to 30 show a projector that mainly includes a source 10, such as the filament of a lamp incandescence or the arc of a discharge lamp, a first mirror 40, a mask 30, a second mirror 20 and an ice cream 50.
  • a source 10 such as the filament of a lamp incandescence or the arc of a discharge lamp
  • the projector also includes, as in the case previous and in a way not illustrated but classic in self, a housing and various auxiliary fittings for mounting, electrical connection, etc.
  • the mirror 40 is of the ellipsoidal, long axis type essentially vertical, and has a first F1 focus or high fireplace and a second F2 fireplace or low fireplace.
  • the source 10 is positioned on the high focus F1 or in its immediate vicinity. Preferably, in the case of an elongated source, this extends horizontally and perpendicular to the optical axis AO as we go define further.
  • the mask 30 is an opaque flat plate, made for example sheet metal, and has an opening 31 whose shape, preferably rectangular and long axis perpendicular to the optical axis AO, is illustrated on the figure 3.
  • the plane of the mask passes through low focus F2 of mirror 40 or in its near vicinity, and is positioned in such a way that the focus F2 is located at the right of the opening 31. It will be noted here that the preferred orientation of the actual source 10 as described above is the more suited to "fill" seamlessly the opening 31 with the light reflected by the mirror 20.
  • the mirror 20 is a beam forming mirror lighting that is for example similar to half lower mirror described with reference to Figure 7. It defines a main optical axis AO and which is suitable for cooperate with the light passing through the opening 31 of mask to form the European passing beam.
  • the virtual source is plane allows to build at mirror level 20 a Optical surface that generates a net cut-off beam in a simpler way than with the source three-dimensional of the previous embodiment.
  • a plane source makes this form invariable, and in this case in the form of a parallelogram, whatever the observation point.
  • the axial vertical section of the mirror 20 can be in this case a simple piece of parable whose home Fb is placed at the level of front edge (that is, the closest to the ice 50) of the opening 31 of the mask 30, which has the effect to bring all the images from the virtual source underneath and flush with the horizontal plane.
  • FIGS. 30 there is represented a concrete embodiment of the mirror 20 a projector of the type shown in FIGS. 30. It is subdivided into two zones, namely a zone upper 20a and a lower zone 20b, the height of zone 20b is preferably substantially greater than that of zone 20a.
  • Each of these areas is subdivided into sub-areas side-by-side, each sub-zone being suitable for generate a beam part whose position and width in the beam are well controlled.
  • these subareas are formed by the orthogonal projection of streaks such as cylindrical axes striations vertically, on a base surface which is, for example, type defined in FR-A-2 536 502 and FR-A-2 536,503.
  • Such a projected streak mirror is described in particularly in FR-A-2 710 393.
  • the upper zone 20a generates, with in this case seven individual sub-areas 21a to 27a, beam sections of large width, with Projected streaks with a relatively large radius of curvature low.
  • This area close to the defined virtual source by the opening 31, generates images relatively large source, unlikely to create well-defined areas of concentration in the beam, but on the contrary conducive to giving it the desired width.
  • the lower zone 20b of the mirror which generates smaller images of the source, is instead consisting of sub-areas 21b to 25b providing a spreading less important, if not virtually zero, of way to create in the beam a spot of concentration of appropriate intensity in the axis of the road.
  • sub-area 24b which is relatively large, is performed in accordance with the invention to create on a limited extent the half-cut at 15 °, for example in using as described above a surface generally parabolic whose focus is judiciously positioned.
  • the projector can generate a beam quite satisfactory especially in term cut definition.
  • sub-area 24b defines the inclined half-cut extends between the edge bottom of the mirror and a level not located at the height of the source but substantially below this one, can of course be implemented also, for one of the zones 214, 226 or both, in the embodiment of Figure 7. This avoids work with more inclined images of the filament as they are generated by points located near the median horizontal plane.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (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 précisément un projecteur susceptible d'émettre un faisceau à coupure, dont au moins une partie de la coupure présente une inclinaison oblique, typiquement à 15°, par rapport à l'horizontale.The present invention relates generally motor vehicle headlamps, and more precisely a projector capable of transmitting breaking beam, of which at least part of the cut has an oblique inclination, typically at 15 °, with respect to the horizontal.

Une telle coupure est par exemple celle définie par les règlements européens en la matière, et comporte, pour un sens de circulation à droite, une demi-coupure gauche horizontale et une demi-coupure droite relevée de 15° au-dessus de l'horizontale.Such a break is for example that defined by European regulations in this area, and includes, for a direction of traffic on the right, a half-cut on the left horizontal and a half straight cut raised by 15 ° above from the horizontal.

On connaít déjà des miroirs de projecteurs capables d'engendrer par eux-mêmes, en coopérant avec une source lumineuse allongée orientée axialement, un faisceau délimité par une telle coupure.We already know mirrors of capable projectors to generate by themselves, cooperating with a source luminous elongated axially oriented, a beam delimited by such a cut.

On citera notamment les documents FR-A-2 536 502, FR-A-2 599 121, FR-A-2 609 148, FR-A-2 639 888, FR-A-2 664 667 au nom de la Demanderesse.In particular, documents FR-A-2 536 502, FR-A-2 599 121, FR-A-2 609 148, FR-A-2 639 888, FR-A-2 664,667 in the name of the Applicant.

Ces miroirs connus, s'ils donnent généralement satisfaction, sont cependant d'une conception telle qu'il leur est difficile d'aboutir au résultat recherché en termes de coupure si la source, telle que le filament cylindrique d'une lampe à incandescence, n'est pas orientée axialement, c'est-à-dire parallèlement à l'axe optique du miroir.These known mirrors, if they usually give satisfaction, however, are of such a design that it is difficult to achieve the desired result in cutoff terms if the source, such as the filament cylinder of an incandescent lamp, is not oriented axially, that is to say parallel to the axis optical mirror.

Or on cherche aujourd'hui à réaliser des projecteurs dans lesquels la source est orientée dans le miroir toujours horizontalement, mais cette fois-ci transversalement à l'axe optique.Nowadays we are trying to achieve projectors in which the source is oriented in the mirror always horizontally but this time transversely to the optical axis.

Une telle orientation a pour but notamment de réaliser des projecteurs dont le miroir présente une dimension en hauteur au moins égale, voire sensiblement supérieure, à sa dimension en largeur.Such an orientation is intended in particular to to make projectors whose mirror presents a dimension in height at least equal, or even substantially greater, in its width dimension.

Certes la Demanderesse a également développé des surfaces réfléchissantes aptes à engendrer avec une source ayant une telle orientation, et sans recourir à des coupelles ou analogues occultant une partie du rayonnement émis par la source, des faisceaux à coupure. On trouve ainsi dans FR-A-2 602 305 la description d'un miroir apte à coopérer avec une source transversale pour engendrer un faisceau antibrouillard, et dans FR-A-2 602 306 la description d'un miroir apte à coopérer sélectivement avec deux sources transversales pour engendrer respectivement un faisceau de croisement et un faisceau de route conformes aux règlements des Etats-Unis d'Amérique, le faisceau de croisement étant délimité par une coupure formée par deux demi-plans horizontaux décalés en hauteur.Admittedly, the Claimant has also developed reflective surfaces capable of generating with a source having such an orientation, and without recourse to cups or the like obscuring part of the radiation emitted by the source, cut-off beams. Thus, FR-A-2 602 305 describes a description of a mirror adapted to cooperate with a transverse source for generate a fog beam, and in FR-A-2 602 306 the description of a mirror capable of cooperating selectively with two cross-sectional sources for generating respectively a passing beam and a road beam in accordance with the regulations of the United States America, the passing beam being delimited by a cut formed by two horizontal half-planes offset in height.

FR 2657680 décrit un projecteur avec une source transversale et un miroir dont les surfaces engendrent des images ayant toutes les directions possibles. Une coupure oblique est obtenue en positionnant ces images le long de la ligne à former.FR 2657680 discloses a projector with a transverse source and a mirror whose surfaces generate images having all possible directions. An oblique cut is obtained by positioning these images along the line to train.

La présente invention propose un projecteur de véhicule automobile tel que défini dans la revendication 1.The present invention offers a vehicle headlamp automobile as defined in claim 1.

Des aspects préférés, mais non limitatifs, du projecteur selon l'invention sont définis dans les revendications dépendantes.Preferred, but not limiting, aspects of according to the invention are defined in the dependent claims.

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

  • la figure 1 est une vue de dos d'un miroir de projecteur, et de la source associée, permettant d'expliquer le comportement du miroir en termes d'inclinaison des images engendrées,
  • la figure 2 est une vue partielle de dos d'un autre genre de miroir et de sa source, illustrant le même type de comportement,
  • la figure 3 est une vue schématique en coupe de la partie de miroir et de la source de la figure 2,
  • la figure 4 est une vue en coupe verticale axiale illustrant la construction d'un miroir auquel s'applique avantageusement la présente invention,
  • la figure 5 est un vue de face du miroir de la figure 4,
  • la figure 6 illustre la répartition, sur un écran de projection, d'images de la source engendrées par le miroir des figures 4 et 5,
  • la figure 7 illustre une première forme de réalisation concrète d'un miroir de projecteur selon l'invention,
  • les figures 8 et 9 illustrent schématiquement, respectivement en coupe horizontale axiale et en vue de face, la conception d'une surface réfléchissante de l'une des zones du miroir de la figure 7,
  • la figure 10 illustre la répartition d'images de la source obtenues avec la zone conçue selon les figures 8 et 9,
  • les figures 11 et 12 illustrent schématiquement, respectivement en coupe horizontale axiale et en vue de face, une variante de la conception d'une surface réfléchissante de l'une des zones du miroir de la figure 7,
  • la figure 13 illustre la répartition d'images de la source obtenues avec la zone conçue selon les figures 11 et 12,
  • les figures 14 à 27 illustrent par des ensembles de courbes isocandela le comportement photométrique de différentes zones du miroir de la figure 7 et son comportement global,
  • la figure 28 est une vue en coupe verticale axiale d'un projecteur selon une autre forme de réalisation concrète de l'invention,
  • la figure 29 est une vue de face du projecteur de la figure 28,
  • la figure 30 est une vue de dessus d'un élément de masquage du projecteur des figures 28 et 29, et
  • la figure 31 illustre en vue de face une forme de réalisation concrète d'un miroir du projecteur des figures 28 et 29.
    • Other aspects, objects and advantages of the present invention will appear better on reading the following detailed description of preferred embodiments thereof, which is given by way of nonlimiting example and with reference to the appended drawings, in which: :
  • FIG. 1 is a rear view of a projector mirror, and the associated source, making it possible to explain the behavior of the mirror in terms of the inclination of the generated images,
  • FIG. 2 is a partial view of the back of another kind of mirror and its source, illustrating the same type of behavior,
  • FIG. 3 is a diagrammatic sectional view of the mirror portion and of the source of FIG. 2,
  • FIG. 4 is an axial vertical sectional view illustrating the construction of a mirror to which the present invention advantageously applies,
  • FIG. 5 is a front view of the mirror of FIG. 4,
  • FIG. 6 illustrates the distribution, on a projection screen, of images of the source generated by the mirror of FIGS. 4 and 5,
  • FIG. 7 illustrates a first concrete embodiment of a projector mirror according to the invention,
  • FIGS. 8 and 9 schematically illustrate, respectively in axial horizontal section and in front view, the design of a reflecting surface of one of the areas of the mirror of FIG. 7,
  • FIG. 10 illustrates the distribution of images of the source obtained with the zone designed according to FIGS. 8 and 9,
  • FIGS. 11 and 12 schematically illustrate, respectively in axial horizontal section and in front view, a variant of the design of a reflecting surface of one of the zones of the mirror of FIG. 7,
  • FIG. 13 illustrates the distribution of images of the source obtained with the zone designed according to FIGS. 11 and 12,
  • FIGS. 14 to 27 illustrate, by sets of isocandal curves, the photometric behavior of different zones of the mirror of FIG. 7 and its overall behavior,
  • FIG. 28 is an axial vertical sectional view of a headlight according to another concrete embodiment of the invention,
  • FIG. 29 is a front view of the projector of FIG. 28,
  • FIG. 30 is a top view of a projector masking element of FIGS. 28 and 29, and
  • Figure 31 illustrates in front view a concrete embodiment of a projector mirror of Figures 28 and 29.

    • En référence tout d'abord à la figure 1, on a représenté en vue de face un miroir 20 destiné à projeter à l'infini un faisceau lumineux d'éclairage, ce miroir recevant en son fond une source lumineuse constituée en l'espèce par le filament généralement cylindrique 10 d'une lampe à incandescence. L'axe du filament 10 est perpendiculaire à l'axe optique du miroir 20, qui est lui-même perpendiculaire au plan de la feuille, et l'axe du filament s'étend en l'espèce horizontalement.Referring first to Figure 1, we have shown in front view a mirror 20 for projecting to infinity a light beam of light, this mirror receiving at its bottom a light source consisting of the species by the generally cylindrical filament 10 an incandescent lamp. The axis of the filament 10 is perpendicular to the optical axis of the mirror 20, which is itself perpendicular to the plane of the leaf, and the axis the filament extends in this case horizontally.

    On comprend que chaque point du miroir 20 va engendrer une image de la source 10 dont l'orientation, dans un plan de projection perpendiculaire à l'axe optique du miroir, va dépendre des coordonnées de ce point. Un premier élément de la démarche aboutissant à la présente invention consiste à localiser sur la surface du miroir les points qui engendrent des images de la source ayant une même inclinaison par rapport à l'horizontale, et en l'espèce une inclinaison de 15° dans le sens de rotation antihoraire, de manière à pouvoir ensuite, en positionnant ces images convenablement, engendrer au moins une partie de la demi-coupure inclinée à 15° d'un faisceau de croisement européen normalisé.We understand that each point of the mirror 20 is generate an image of the source 10 whose orientation, in a projection plane perpendicular to the axis optical mirror, will depend on the coordinates of this point. A first element of the approach leading to the The present invention consists in locating on the surface of the mirror the points that generate images of the source having the same inclination with respect to the horizontal, and in this case an inclination of 15 ° in the direction of anticlockwise rotation, so that positioning these images appropriately, least part of the half-cut inclined at 15 ° of a standardized European passing beam.

    Ainsi la figure 1 illustre en vue en élévation de dos le cas d'école d'un miroir 20 possédant une surface réfléchissante en forme de paraboloide de révolution focalisée en centre d'un filament transversal 10, et l'on a identifié sur cette surface un certain nombre de lignes de points de la surface (LN) engendrant des images dont les grands axes ont tous la même inclinaison de N degrés par rapport à l'horizontal. En gras figurent les lignes L15 correspondant à des inclinaisons d'images de la source orientées à 15° dans un sens ou dans l'autre par rapport à l'horizontale.Thus, FIG. 1 illustrates in a rear elevational view the school case of a mirror 20 having a reflective surface in the form of a paraboloid of revolution focused in the center of a transverse filament 10, and it has been identified on this surface. a certain number of lines of points of the surface (L N ) generating images whose major axes all have the same inclination of N degrees with respect to the horizontal. In bold are lines L 15 corresponding to inclinations of images of the source oriented at 15 ° in one direction or the other with respect to the horizontal.

    On comprend donc qu'une zone Z du miroir, telle qu'indiquée par des hachures, va engendrer des images de la source ayant toutes une inclinaison qui varie dans des limites relativement étroites autour de l'orientation visée de 15°. Il est donc possible :It is therefore clear that a zone Z of the mirror, such than indicated by hatching, will generate images of the source having all an inclination which varies in relatively narrow boundaries around the orientation target of 15 °. It is therefore possible:

    d'utiliser les autres parties de la surface du miroir pour former un faisceau tel qu'un faisceau de croisement européen normalisé, éventuellement en coopération avec des aménagements optiques sur la glace ;

    • d'utiliser spécifiquement la zone Z pour au moins amorcer la demi-coupure remontante à environ 15° du faisceau, ici encore éventuellement en coopération avec la glace.
    using the other parts of the mirror surface to form a beam such as a standardized European passing beam, possibly in cooperation with optical arrangements on the ice;
    • to specifically use the zone Z to at least initiate the upgoing half-cut at about 15 ° of the beam, here again possibly in cooperation with the ice.

    La figure 2 illustre en vue de dos un quart d'un miroir 20, qui est constitué par un morceau de paraboloide focalisée en arrière du filament 10 et latéralement par rapport à celui-ci, ainsi que les lignes L15 d'iso-inclinaison des images à 15°. La figure 3 illustre la génératrice horizontale de ce quart de miroir, ainsi que la position du foyer F.FIG. 2 illustrates, in the rear view, a quarter of a mirror 20, which consists of a piece of paraboloid focused behind the filament 10 and laterally with respect thereto, as well as the lines L 15 of iso-inclination 15 ° images. Figure 3 illustrates the horizontal generatrix of this quarter mirror, as well as the position of the focus F.

    On comprend qu'une zone Z du miroir avoisinant la ligne L15 va permettre, avec la surface parabolique sus-décrite, d'engendrer des images du filament qui, dans un écran de projection, vont pivoter autour de leur bord latéral homologue du bord du filament auquel est situé le foyer et dans des limites angulaires situées de part et d'autre de la valeur de 15°, ces images étant situées à droite du centre de référence de l'écran. Une telle surface est donc propre à amorcer la coupure remontante à 15°, et en même temps à créer une tache de concentration immédiatement au-dessous de cette coupure, comme on le verra en détail plus loin dans une forme de réalisation concrète de la présente invention.It is understood that a zone Z of the mirror surrounding the line L15 will allow, with the above-described parabolic surface, to generate images of the filament which, in a projection screen, will rotate around their edge homologous side of the filament edge on which the focus and within angular boundaries located on both sides the value of 15 °, these images being located at right of the reference center of the screen. Such a surface is therefore suitable for initiating the ascending cut at 15 °, and at the same time to create a concentration spot immediately below this cut, as it is will see in detail later in an embodiment concrete of the present invention.

    En référence maintenant aux figures 4 et 5, qui illustrent un ensemble miroir/filament auquel on va appliquer l'obtention de coupure selon l'invention, on a représenté le filament cylindrique 10, qui peut typiquement être constitué, soit du filament transversal d'une lampe normalisée H3 montée axialement au fond du miroir, soit du filament axial d'une lampe H1 ou H7 montée latéralement dans le miroir.Referring now to FIGS. 4 and 5, which illustrate a mirror / filament set that we are going to apply the cut-off according to the invention, we have represented the cylindrical filament 10, which can typically be made of either the transverse filament a standard lamp H3 mounted axially at the bottom of the mirror, the axial filament of an H1 or H7 lamp mounted laterally in the mirror.

    Les génératrices verticales haute et basse, respectivement 20h et 20b, du miroir 20 sont conçues de manière à amener toutes les images du filament 10 au-dessous et essentiellement au ras du niveau horizontal, de manière à pouvoir engendrer, comme on le verra en détail plus loin, des faisceaux à coupure nette de bonne qualité.Vertical generators high and low, respectively 20h and 20b, of the mirror 20 are designed to way to bring all the images of filament 10 underneath and essentially flush with the horizontal level, in order to be able to engender, as will be seen in detail further on, clusters net cut of good quality.

    Préférentiellement, et en se référant en particulier à la figure 4, ces génératrices verticales sont construites en traçant des droites D1 tangentes à la surface du filament 10, ces droites se trouvant du côté arrière du filament pour ce qui concerne la génératrice supérieure 20h, et se trouvant du côté avant du filament pour ce qui concerne la génératrice 20b.Preferentially, and with reference to particular in Figure 4, these vertical generators are constructed by drawing straight lines D1 tangent to the filament surface 10, these lines lying on the back of the filament with respect to the generator upper 20h, and lying on the front side of the filament for the generator 20b.

    A chacune de ces droites D1, correspondant à un rayon lumineux émis par un bord du filament 10, sont respectivement associées des droites D2 parallèles à l'axe optique y-y du miroir, qui lui même est sensiblement parallèle à l'axe du véhicule.To each of these lines D1, corresponding to a light beam emitted by an edge of the filament 10, are respectively associated straight lines D2 parallel to the optical axis y-y of the mirror, which itself is substantially parallel to the axis of the vehicle.

    Pour chaque couple de droites (D1, D2) on détermine leur bissectrice BS et la droite TG qui est perpendiculaire à cette bissectrice.For each pair of lines (D1, D2) we determine their bisector BS and the TG right that is perpendicular to this bisector.

    Chaque génératrice est construite de proche en proche, en partant du fond du miroir 20 que l'on fixe à une cote prédéterminée par rapport au filament, à partir des différentes droites TG obtenues, pour définir une ligne courbe, que l'on appellera dans la suite « génératrice évolutive » dans la mesure où elle ne présente pas un foyer fixe, mais un ensemble de foyers qui évoluent progressivement à mesure que l'on se déplace le long de ladite génératrice. Ces génératrices se distinguent en cela des génératrices à foyer fixe, c'est-à-dire paraboliques, décrites plus haut. Each generator is built from close to near, from the bottom of the mirror 20 that is fixed to a predetermined dimension with respect to the filament, from different TG lines obtained, to define a curved line, which will be called in the following "Evolutionary generator" in so far as it does not not have a fixed focus, but a set of hearths which evolve progressively as one moves along said generator. These generators are distinguished in this respect from fixed-focus generators, that is to say parabolic, described above.

    On comprend ici qu'en jouant sur la distance horizontale entre le fond du miroir 20 et le filament 10, on va pouvoir ainsi concevoir des génératrices 20a, 20b plus ou moins ouvertes ou fermées autour de la source, et donc jouer d'une part sur la taille des images du filament engendrées, et d'autre part sur la quantité de flux lumineux que le miroir récupère sur une hauteur donnée.We understand here that by playing on the distance horizontal between the bottom of the mirror 20 and the filament 10, we will be able to design generators 20a, 20b more or less open or closed around the source, and so play on the one hand on the size of the images of the filament generated, and secondly on the quantity of luminous flux that the mirror recovers on a height given.

    L'équation différentielle des génératrices 20h et 20b, qu'il est aisé de résoudre par des moyens de calcul assistés par ordinateur, peut s'exprimer de la façon suivante : Δz = Δb.(z.sinβ - y.cosβ) Δy = Δz.tg(β/2) avec comme conditions initiales : z = -Rfil y = -F où :

  • (y,z) : repère orthonormé dont l'origine est au centre du filament 10, y étant l'axe optique horizontal et z étant vertical.
  • Rfil : rayon du filament, et
  • F : distance mesurée selon y entre le centre du filament et le fond du miroir.
    • The differential equation of the generators 20h and 20b, which can easily be solved by computer-assisted computing means, can be expressed as follows: Δz = Δb. (Z.sinβ - y.cosβ) Δy = Δz.tg (β / 2) with as initial conditions: z = -Rfil y = -F or :
  • (y, z): orthonormal reference whose origin is at the center of the filament 10, y being the horizontal optical axis and z being vertical.
  • Rfil: radius of the filament, and
  • F: distance measured along y between the center of the filament and the bottom of the mirror.

    • On comprend que, grâce à une telle conception des génératrices 20h, 20b, ont aboutit à ce que chaque image du filament 10 qu'elle engendre se situe immédiatement au-dessous et au ras d'une coupure horizontale qui passe par l'axe y-y. We understand that thanks to such a conception of generators 20h, 20b, have resulted in each image of the filament 10 that it generates is immediately below and flush with a horizontal cut that passes by the y-y axis.

    La figure 6 illustre la disposition des images, alignées au-dessous et au ras du plan horizontal, obtenues avec un miroir 20 possédant la génératrice verticale décrite ci-dessus et une génératrice horizontale présentant une certaine défocalisation par rapport à la source 10. Ces images définissent une coupure horizontale de très bonne netteté.Figure 6 illustrates the arrangement of the images, aligned below and flush with the horizontal plane, obtained with a mirror 20 having the generator vertical described above and a generator horizontal with some defocusing by to the source 10. These images define a horizontal cut of very good sharpness.

    A partir de là, on comprend qu'en combinant une surface de ce type avec une surface constituée par exemple par la zone Z de la figure 2, on peut réaliser un faisceau de croisement conforme aux règlements européens.From there, we understand that by combining a surface of this type with a surface constituted by example by zone Z of FIG. 2, it is possible to realize a passing beam according to European regulations.

    On va maintenant décrire en référence à la figure 7 une forme de réalisation concrète d'un miroir défini avec la génératrice verticale décrite plus haut en référence à la figure 4, mais susceptible d'engendrer par lui-même, c'est-à-dire sans l'intervention de la glace de fermeture, un faisceau de croisement de type européen possédant la largeur horizontale requise. Celui-ci est engendré en divisant le miroir 20 en différentes zones comme illustré sur la figure 7.We will now describe with reference to FIG. a concrete embodiment of a mirror defined with the vertical generator described above with reference to Figure 4, but likely to generate by itself, that is without the intervention of ice cream closure, a European-type passing beam having the required horizontal width. It is generated by dividing the mirror 20 into different areas as shown in Figure 7.

    Sur cette figure, le miroir possède une moitié supérieure 21 et une moitié inférieure 22, qui comportent chacune neuf zones, respectivement 211 à 219 et 221 à 229.In this figure, the mirror has a half upper 21 and a lower half 22, which comprise each nine areas, respectively 211 to 219 and 221 to 229.

    Dans l'exemple représenté, les différentes zones ont des largeurs relativement voisines, et typiquement comprises entre 6 et 13 mm, et sont caractérisées pour l'essentiel par des génératrices horizontales différentes, définies en fonction du décalage latéral et de l'étalement souhaités de la lumière.In the example shown, the different zones have relatively similar widths, and typically between 6 and 13 mm, and are characterized for the main thing by horizontal generators different, defined according to the lateral shift and of the desired spreading of the light.

    Ainsi les zones centrales 215 et 225 qui engendrent des images du filament 10 qui sont horizontales ou très peu inclinées par rapport à l'horizontale, sont destinées à réaliser la coupure horizontale sur une étendue importante. Leur génératrice horizontale est avantageusement une droite.Thus the central zones 215 and 225 that generate images of filament 10 that are horizontal or very slightly inclined to the horizontal, are intended to realize the horizontal cut on an extent important. Their horizontal generatrix is advantageously a straight line.

    Les zones 214 et 226 sont celles qui sont conçues selon les principes exposés plus haut en référence aux figures 1 à 3, et englobent respectivement la plus grande partie de deux lignes d'iso-inclinaison L15 de manière à engendrer des images du filament qui sont parallèles ou modérément inclinées par rapport à la demi-coupure à 15° typique d'un faisceau de croisement européen.The zones 214 and 226 are those which are designed according to the principles explained above with reference to FIGS. 1 to 3, and respectively encompass the greater part of two iso-inclination lines L 15 so as to generate images of the filament which are parallel or moderately inclined with respect to the typical 15 ° half-cut of a European passing beam.

    Le positionnement des images du filament engendrées par ces deux zones immédiatement au-dessous de la demi-coupure inclinée est réalisé de préférence comme décrit plus haut. Ainsi l'on peut utiliser des zones 214, 226 soit constituées de morceaux de paraboles, soit présentant des génératrices horizontale et verticale de foyers différents (la position du foyer de la génératrice horizontale déterminant en particulier le positionnement symétrique ou au contraire dissymétrique des images par rapport au plan vertical axial passant par le centre de référence de l'écran de projection), soit encore et de préférence présentant une génératrice horizontale parabolique et une génératrice verticale évolutive telle que décrite ci-dessus en référence à la figure 4.The positioning of the generated filament images by these two areas immediately below the half-cut inclined is preferably carried out as described upper. Thus, it is possible to use zones 214, 226 consist of pieces of parables, or with horizontal and vertical generators of different homes (the home position of the generator horizontal determining in particular the positioning symmetrical or otherwise asymmetrical images by relative to the axial vertical plane passing through the center of reference of the projection screen), ie again and preferably having a horizontal generatrix parabolic and a scalable vertical generator such as described above with reference to FIG.

    Ainsi les figures 8 et 9 illustrent le cas où la zone 214 est une surface engendrée en faisant glisser la génératrice verticale de la figure 4, de telle manière qu'elle reste parallèle au plan y0z, sur une génératrice horizontale constituée par un morceau de parabole dont le foyer F est situé en arrière du filament 10, et au droit de son centre. Il en résulte la répartition d'images telle qu'illustrée sur la figure 10, dont on observe qu'elle amorce avec netteté à la fois la demi-coupure horizontale hH du faisceau et sa demi-coupure remontante Hc, et qu'elle participe à une tache de concentration lumineuse dans l'axe de la route.Thus Figures 8 and 9 illustrate the case where the zone 214 is a surface generated by dragging the vertical generator of Figure 4, in such a way that it stays parallel to the plane y0z, on a generator horizontal constituted by a piece of parabola whose F hearth is located behind the filament 10, and to the right from its center. This results in the distribution of images as illustrated in Figure 10, which can be observed that it primed with clarity both the half-cut horizontal hH of the beam and its rising half-break Hc, and she participates in a concentration task bright in the axis of the road.

    Les figures 11 et 12 illustrent quant à elles le cas où le morceau de parabole définissant la génératrice horizontale de la zone 214 présente un axe O'y' décalé latéralement par rapport à l'axe principal 0y du miroir, de manière à ce que le foyer F soit rapproché de l'extrémité latérale du filament 10 opposée au côté dans lequel se trouve la zone 214, tandis que la génératrice verticale est toujours du type de celle illustrée sur la figure 4. Les images résultantes sont illustrées sur la figure 13, et l'on observe que le décalage latéral du foyer F crée un décalage des images du côté de la demi-coupure inclinée Hc, ainsi qu'une tache de concentration au-dessous de cette demi-coupure Hc, de manière à mieux éclairer le bas-côté de la route.Figures 11 and 12 illustrate the case where the piece of parabola defining the generator horizontal of zone 214 has an O'y axis offset laterally with respect to the main axis 0y of the mirror, so that the focus F is brought closer to the lateral end of the filament 10 opposite the side in which is zone 214, while the generator vertical is always of the type illustrated in the Figure 4. The resulting images are illustrated on the Figure 13, and it is observed that the lateral shift of the focus F creates a shift of images on the half-cut side inclined Hc, as well as a concentration spot below this half-cut Hc, so as to better illuminate the side of the road.

    L'homme du métier saura facilement transposer la description ci-dessus au cas de la zone 226, ayant le même rôle, située dans la moitié inférieure du miroir. Le cas échéant, et de matière à élargir la tache de concentration et la définition de la demi-coupure inclinée, il peut être avantageux d'utiliser, pour les génératrices horizontales des zones 214 et 226, des foyers F positionnés différemment, l'un pouvant se trouver par exemple au droit d'un point situé entre le centre du filament et l'un de ses bords, et l'autre pouvant se trouver à l'extérieur de ce même bord.The skilled person will easily transpose the description above in the case of zone 226, having the same role, located in the lower half of the mirror. The where appropriate, and of material to expand the task of concentration and the definition of the half-cut inclined, it may be advantageous to use, for horizontal generators of zones 214 and 226, F homes positioned differently, one being able to find for example at the right of a point located between the center of the filament and one of its edges, and the other may be outside this same edge.

    Bien entendu, d'autres solutions peuvent être utilisées pour positionner les images du filament d'une façon analogue à celle illustrée sur les figures 10 et 13.Of course, other solutions can be used to position the filament images of a analogous to that illustrated in FIGS. 13.

    En particulier, on peut prévoir de réaliser la zone 214 en lui donnant une surface de base située dans la continuité, et avec les mêmes équations, que les surfaces des zones adjacentes du miroir, telles qu'on va les décrire plus loin, et en appliquant sur ces surfaces de base, par projection selon l'axe Oy, des éléments optiques correcteurs tels que des prismes et le cas échéant des stries destinés à positionner les images comme indiqué.In particular, it can be expected to realize the area 214 by giving him a base area located in the continuity, and with the same equations, as the surfaces adjacent areas of the mirror, as we go describe further, and by applying on these surfaces of base, by projection along the Oy axis, elements correcting optics such as prisms and the case appropriate streaks to position the images as indicated.

    Une autre solution consiste à réaliser la zone 214 avec une surface s'étendant dans la continuité de celles des zones adjacentes, et en prévoyant dans la zone de la glace de fermeture qui est homologue des zones 214, 226 du miroir des prismes et le cas échéant des stries ayant la même fonction que celles projetées sur le miroir comme indiqué plus haut.Another solution is to make area 214 with a surface extending in continuity with those adjacent areas, and planning in the area of the closing glass which is homologous to zones 214, 226 of the mirror of the prisms and where appropriate streaks having the same function as those projected on the mirror as indicated above.

    Les autres zones du miroir 20 de la figure 7 sont utilisées pour assurer une répartition lumineuse satisfaisante de la lumière dans les différentes zones du faisceau. Pour ce faire, on adapte au cas par cas les génératrices horizontales de ces zones, qui sont de préférence les mêmes pour la zone supérieure et pour la zone inférieure de manière à éviter des discontinuités susceptibles d'engendrer des défauts optiques.The other zones of the mirror 20 of FIG. used to ensure a light distribution satisfactory light in the different areas of the beam. To do this, we adapt on a case-by-case basis the horizontal generators of these areas, which are preferably the same for the upper zone and for the lower zone so as to avoid discontinuities likely to cause optical defects.

    On observera ici que si les génératrices des différentes zones adjacentes se raccordent entre elles de façon continue (mais pas nécessairement de façon dérivable), alors la surface du miroir est également continue dans la mesure où la surface est engendrée en faisant glisser la génératrice verticale le long de la génératrice horizontale.We will observe here that if the generators of different adjacent areas connect to each other continuous way (but not necessarily so differentiable), then the surface of the mirror is also continues insofar as the surface is generated in sliding the vertical generator along the horizontal generator.

    On observera en outre que, si les zones centrales 215, 225 présentent la génératrice verticale telle que décrite en référence à la figure 2, les autres zones peuvent éventuellement présenter, selon la fonction qui leur est attribuée, des surfaces de types différents, et notamment des surfaces dérivées des enseignements des documents FR-A-2 536 502, FR-A-2 536 503, FR-A-2 602 305, FR-A-2 602 306, FR-A-2 609 146, FR-A-2 609 148, FR-A-2 639 888, FR-A-2 664 677 et FR-A-2 710 393, au nom de la Demanderesse.In addition, if central areas are 215, 225 present the vertical generator as described with reference to FIG. 2, the other zones may possibly present, depending on the function that assigned to them, surfaces of different types, and including surfaces derived from the teachings of documents FR-A-2 536 502, FR-A-2 536 503, FR-A-2 602 305, FR-A-2,602,306, FR-A-2,609,146, FR-A-2,609,148, FR-A-2 639 888, FR-A-2 664 677 and FR-A-2 710 393, in the name of Applicant.

    Les figures 14 à 22 illustrent par des ensembles de courbes isocandela les parties de faisceau qui sont par exemple engendrées par les zones 214, 213, 212, 211, 216, 217, 218, 219 et 215 du miroir de la figure 7, tandis que les figures 23 et 24 illustrent l'allure obtenue en superposant respectivement les parties de faisceau des figures 14 à 17 et les parties de faisceau des figures 18 à 21.Figures 14 to 22 illustrate by sets of curves isocandela the beam parts that are by example generated by the zones 214, 213, 212, 211, 216, 217, 218, 219 and 215 of the mirror of Figure 7, while FIGS. 23 and 24 illustrate the shape obtained in superimposing respectively the beam portions of Figures 14 to 17 and the beam portions of Figures 18 at 21.

    La figure 25 illustre l'allure de la partie de faisceau engendrée par la moitié supérieure du miroir de la figure 11, tandis que la figure 26 illustre l'allure de la partie de faisceau engendrée par sa moitié inférieure.Figure 25 illustrates the pace of the game of beam generated by the upper half of the mirror of Figure 11, while Figure 26 illustrates the pace of the beam part generated by his half lower.

    La figure 27 illustre l'allure du faisceau globalement obtenu. On observe qu'il s'agit d'un faisceau présentant toutes les qualités requises en termes de largeur, d'épaisseur et de concentration dans l'axe de la route.Figure 27 illustrates the pace of the beam globally obtained. It is observed that this is a beam having all the qualities required in terms of width, thickness and concentration in the axis of the road.

    On observe en particulier sur la figure 14 la répartition lumineuse obtenue avec la zone 214 du miroir, résultant d'une répartition d'images du type de celle illustrée sur la figure 13.In particular, FIG. light distribution obtained with the zone 214 of the mirror, resulting from a distribution of images of the type of illustrated in Figure 13.

    On observera ici que la présente invention permet de réaliser, grâce au recours à une source transversale et aux différentes zones telles que décrites plus haut, des miroirs pour faisceau de croisement européen dont la largeur est sensiblement inférieure à la hauteur. Typiquement le rapport entre hauteur et largeur peut être compris entre 1,2:1 et 4:1.It will be observed here that the present invention enables to achieve, through the use of a cross-sectional source and the different areas as described above, mirrors for European passing beam whose width is substantially less than the height. Typically the ratio between height and width can be between 1.2: 1 and 4: 1.

    La présente invention s'applique également à un projecteur selon une autre forme de réalisation concrète de l'invention, que l'on va maintenant décrire en référence aux figures 28 à 31.The present invention also applies to a projector according to another concrete embodiment of the invention, which will now be described in reference to Figures 28 to 31.

    Ainsi les figures 28 à 30 représentent un projecteur qui comprend principalement une source lumineuse 10, telle que le filament d'une lampe à incandescence ou l'arc d'une lampe à décharge, un premier miroir 40, un masque 30, un second miroir 20 et une glace 50.Thus, Figures 28 to 30 show a projector that mainly includes a source 10, such as the filament of a lamp incandescence or the arc of a discharge lamp, a first mirror 40, a mask 30, a second mirror 20 and an ice cream 50.

    Le projecteur comprend également, comme dans le cas précédent et de façon non illustrée mais classique en soi, un boítier et différents aménagements auxiliaires pour son montage, sa connexion électrique, etc.The projector also includes, as in the case previous and in a way not illustrated but classic in self, a housing and various auxiliary fittings for mounting, electrical connection, etc.

    Le miroir 40 est du genre ellipsoïdal, de grand axe essentiellement vertical, et possède un premier foyer F1 ou foyer haut et un second foyer F2 ou foyer bas.The mirror 40 is of the ellipsoidal, long axis type essentially vertical, and has a first F1 focus or high fireplace and a second F2 fireplace or low fireplace.

    La source 10 est positionnée sur le foyer haut F1 ou en son proche voisinage. De préférence, dans le cas d'une source allongée, celle-ci s'étend horizontalement et perpendiculairement à l'axe optique AO tel qu'on va le définir plus loin. The source 10 is positioned on the high focus F1 or in its immediate vicinity. Preferably, in the case of an elongated source, this extends horizontally and perpendicular to the optical axis AO as we go define further.

    Le masque 30 est une plaque plane opaque, réalisée par exemple en tôle, et possède une ouverture 31 dont la forme, de préférence rectangulaire et de grand axe perpendiculaire à l'axe optique AO, est illustrée sur la figure 3.The mask 30 is an opaque flat plate, made for example sheet metal, and has an opening 31 whose shape, preferably rectangular and long axis perpendicular to the optical axis AO, is illustrated on the figure 3.

    Le plan du masque passe par le foyer bas F2 du miroir 40 ou en son proche voisinage, et est positionné de telle manière que le foyer F2 soit situé au droit de l'ouverture 31. On notera ici que l'orientation préférée de la source réelle 10 telle que décrite plus haut est la plus adaptée pour « remplir » de façon homogène l'ouverture 31 avec la lumière réfléchie par le miroir 20.The plane of the mask passes through low focus F2 of mirror 40 or in its near vicinity, and is positioned in such a way that the focus F2 is located at the right of the opening 31. It will be noted here that the preferred orientation of the actual source 10 as described above is the more suited to "fill" seamlessly the opening 31 with the light reflected by the mirror 20.

    Le miroir 20 est un miroir de formation de faisceau d'éclairage qui est par exemple semblable à la moitié inférieure du miroir décrit en référence à la figure 7. Il définit un axe optique principal AO et qui est apte à coopérer avec la lumière passant par l'ouverture 31 du masque pour former le faisceau de croisement européen.The mirror 20 is a beam forming mirror lighting that is for example similar to half lower mirror described with reference to Figure 7. It defines a main optical axis AO and which is suitable for cooperate with the light passing through the opening 31 of mask to form the European passing beam.

    Dans le même esprit que précédemment, le recours à un masque 30 doté d'une ouverture 31 dont le grand axe s'étend transversalement à l'axe optique AO du projecteur permet d'engendrer des faisceaux tout à fait satisfaisants avec un miroir 20 dont la hauteur est importante, et typiquement au moins aussi grande que sa largeur.In the same spirit as before, recourse to a mask 30 having an opening 31 whose major axis extends transversely to the optical axis AO of the headlamp allows to generate beams quite satisfactory with a mirror 20 whose height is important, and typically at least as big as its width.

    En outre, le fait que la source virtuelle soit plane permet de construire au niveau du miroir 20 une surface optique qui engendre un faisceau à-coupure nette d'une manière plus simple qu'avec la source tridimensionnelle de la forme de réalisation précédente. En effet, alors que dans le cas d'une source tridimensionnelle, son contour vu du miroir 20 varie selon le point d'observation sur ce miroir, le recours à une source plane permet de rendre cette forme invariable, et en l'espèce en forme de parallélogramme, quel que soit le point d'observation.In addition, the fact that the virtual source is plane allows to build at mirror level 20 a Optical surface that generates a net cut-off beam in a simpler way than with the source three-dimensional of the previous embodiment. Indeed, while in the case of a source three-dimensional, its contour seen from the mirror 20 varies according to the observation point on this mirror, recourse to a plane source makes this form invariable, and in this case in the form of a parallelogram, whatever the observation point.

    En particulier, la section verticale axiale du miroir 20 peut être dans ce cas un simple morceau de parabole dont le foyer Fb se trouve placé au niveau du bord avant (c'est-à-dire le plus proche de la glace 50) de l'ouverture 31 du masque 30, ce qui a pour effet d'amener toutes les images de la source virtuelle au-dessous et au ras du plan horizontal.In particular, the axial vertical section of the mirror 20 can be in this case a simple piece of parable whose home Fb is placed at the level of front edge (that is, the closest to the ice 50) of the opening 31 of the mask 30, which has the effect to bring all the images from the virtual source underneath and flush with the horizontal plane.

    En référence maintenant à la figure 31, on a représenté une forme de réalisation concrète du miroir 20 d'un projecteur du type représenté sur les figures 28 à 30. Il est subdivisé en deux zones, à savoir une zone supérieure 20a et une zone inférieure 20b, la hauteur de la zone 20b étant de préférence sensiblement supérieure à celle de la zone 20a.Referring now to Figure 31, there is represented a concrete embodiment of the mirror 20 a projector of the type shown in FIGS. 30. It is subdivided into two zones, namely a zone upper 20a and a lower zone 20b, the height of zone 20b is preferably substantially greater than that of zone 20a.

    Chacune de ces zones est subdivisée en sous-zones s'étendant côte-à-côte, chaque sous-zone étant apte à engendrer une partie de faisceau dont la position et la largeur dans le faisceau sont bien contrôlés.Each of these areas is subdivided into sub-areas side-by-side, each sub-zone being suitable for generate a beam part whose position and width in the beam are well controlled.

    Selon une forme de réalisation particulière, ces sous-zones sont formées par la projection orthogonale de stries telles que des stries cylindriques d'axes verticaux, sur une surface de base qui est par exemple du type défini dans les documents FR-A-2 536 502 et FR-A-2 536 503.According to a particular embodiment, these subareas are formed by the orthogonal projection of streaks such as cylindrical axes striations vertically, on a base surface which is, for example, type defined in FR-A-2 536 502 and FR-A-2 536,503.

    Un tel miroir à stries projetées est décrit en particulier dans le document FR-A-2 710 393. Such a projected streak mirror is described in particularly in FR-A-2 710 393.

    Avantageusement, la zone supérieure 20a engendre, avec en l'espèce sept sous-zones individuelles 21a à 27a, des parties de faisceau de largeur importante, avec des stries projetées d'un rayon de courbure relativement faible. Cette zone, proche de la source virtuelle définie par l'ouverture 31, engendre en effet des images relativement grandes de la source, peu propices à créer des zones de concentration bien définies dans le faisceau, mais au contraire propices à lui donner la largeur désirée.Advantageously, the upper zone 20a generates, with in this case seven individual sub-areas 21a to 27a, beam sections of large width, with Projected streaks with a relatively large radius of curvature low. This area, close to the defined virtual source by the opening 31, generates images relatively large source, unlikely to create well-defined areas of concentration in the beam, but on the contrary conducive to giving it the desired width.

    La zone inférieure 20b du miroir, qui engendre des images plus petites de la source, est au contraire constituée de sous-zones 21b à 25b assurant un étalement latéral moins important, voire pratiquement nul, de manière à créer dans le faisceau une tache de concentration d'intensité appropriée dans l'axe de la route.The lower zone 20b of the mirror, which generates smaller images of the source, is instead consisting of sub-areas 21b to 25b providing a spreading less important, if not virtually zero, of way to create in the beam a spot of concentration of appropriate intensity in the axis of the road.

    Enfin la sous-zone 24b, relativement étendue, est réalisée conformément à l'invention pour créer sur une étendue limitée la demi-coupure à 15°, par exemple en utilisant comme décrit plus haut une surface généralement parabolique dont le foyer est judicieusement positionné.Finally, sub-area 24b, which is relatively large, is performed in accordance with the invention to create on a limited extent the half-cut at 15 °, for example in using as described above a surface generally parabolic whose focus is judiciously positioned.

    Ici encore, le projecteur permet d'engendrer un faisceau tout à fait satisfaisant en particulier en terme de définition de coupure.Here again, the projector can generate a beam quite satisfactory especially in term cut definition.

    On observera ici qu'une particularité de cette forme de réalisation, selon laquelle la sous-zone 24b qui définit la demi-coupure inclinée s'étend entre le bord inférieur du miroir et un niveau situé non pas à la hauteur de la source, mais sensiblement en-dessous de celle-ci, peut bien entendu être mise en oeuvre également, pour l'une des zones 214, 226 ou pour les deux, dans la forme de réalisation de la figure 7. On évite ainsi de travailler avec des images plus inclinées du filament telles qu'elles sont engendrées par des points situés près du plan horizontal médian.We will observe here that a particularity of this embodiment, that sub-area 24b defines the inclined half-cut extends between the edge bottom of the mirror and a level not located at the height of the source but substantially below this one, can of course be implemented also, for one of the zones 214, 226 or both, in the embodiment of Figure 7. This avoids work with more inclined images of the filament as they are generated by points located near the median horizontal plane.

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

    Claims (15)

    1. A motor vehicle headlight comprising a light source (10; 31), a reflector (20) and a cover glass (50), the source being oriented essentially transversely with respect to an optical axis of the reflector, characterised in that the reflector on its base surface, or the cover glass, includes optical correcting means, adapted to position the said images along the said inclined portion of the cut-off and disposed in line with at least one zone of the reflector (214. 226; 24b) adapted to generate images of the source, all of which have an inclination which vanes within a limited range about a given inclination with respect to the horizontal, and specifically adapted to start an inclined portion (Hc) of a cut-off of the beam produced by the said reflector, the inclination of which corresponds to the said given inclination of the images.
    2. A headlight according to Claim 1, characterised in that the source (10: 31) is oriented horizontally.
    3. A headlight according to Claim 2, characterised in that the source (10) is a real volumetric source.
    4. A headlight according to Claim 3. characterised in that the source is at a height intermediate between the upper and lower edges of the reflector, and in that the optical correcting means are arranged in two zones (214, 226) of the reflector which are situated respectively in two opposed quadrants of the reflector.
    5. A headlight according to Claim 2. characterised in that the source is a flat source.
    6. A headlight according to Claim 5, characterised in that the source is defined by a light issuing from a real source (10) and projected from a given flat motif (31). and in that the optical correcting means are arranged in a zone (24b) of the reflector which is offset laterally and spaced vertically away from the said source
    7. A headlight according to Claim 5 or Claim 6, characterised in that the or each zone (213, 226; 24b) of the reflector extends between an upper or lower edge of the reflector and a substantially horizontal plane (x0y) passing close to the flat source (31)
    8. A headlight according to Claim 5 or Claim 6. characterised in that the or each zone (213, 226; 24b) of the reflector extends between an upper or lower edge of the reflector and a limit which is situated at a distance from an essentially horizontal plane passing close to the flat source.
    9. A headlight according to one of Claims 1 to 8, characterised in that the or each zone (214, 226, 24b) has, in front view of the reflector, an essentially rectangular contour having a major axis which is generally vertical.
    10. A headlight according to one of Claims 1 to 9, characterised m that the correcting means consist of a surface of the or each zone of the reflector which has an essentially parabolic horizontal generatrix.
    11. A headlight according to Claim 10 taken in combination with Claim 3 or Claim 4, characterised in that the said surface has a vertical generatrix such that a light ray (DI) emitted tangentially by an edge of the source is reflected (D2) parallel to the said optical axis, the light rays emitted by the remainder of the source being reflected in a downwardly inclined direction with respect to the said optical axis.
    12. A headlight according to Claim 10 taken in combination with one of Claims 5 to 8, characterised in that the said surface has an essentially parabolic vertical generatrix, the focus of which lies in the vicinity of an edge of the flat source which is transverse to the optical axis
    13. A headlight according to one of Claims 10 to 12, characterised in that the axis (0'y') of the horizontal generatrix is offset laterally with respect to the centre of the source, towards the side of the reflector which is opposed to that which contains the zone that has the said horizontal generatrix
    14. A headlight according to one of Claims 1 to 9. characterised in that the optical correcting means consist of optical elements projected on a base surface of the said zone or zones (214, 226, 24b) of the reflector which extend the adjacent zones continuously.
    15. A headlight according to one of Claims 1 to 9, characterised in that the optical correcting means consist of optical elements constituted on the cover glass of the headlight in zones of the latter which are homologous with the said zone or zones (214, 226; 24b) of the reflector.
    EP99400185A 1998-01-28 1999-01-27 Vehicle headlight comprising a transversal source and able to generate a V-shaped cut-off Expired - Lifetime EP0933586B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9800904A FR2774149B1 (en) 1998-01-28 1998-01-28 MOTOR VEHICLE HEADLIGHT, INCLUDING A CROSS-SECTIONAL SOURCE, AND CAPABLE OF GENERATING A BEAM WITH NON-RECTILLINE CUT
    FR9800904 1998-01-28

    Publications (2)

    Publication Number Publication Date
    EP0933586A1 EP0933586A1 (en) 1999-08-04
    EP0933586B1 true EP0933586B1 (en) 2005-07-13

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    EP99400185A Expired - Lifetime EP0933586B1 (en) 1998-01-28 1999-01-27 Vehicle headlight comprising a transversal source and able to generate a V-shaped cut-off

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    EP (1) EP0933586B1 (en)
    DE (1) DE69926090T2 (en)
    ES (1) ES2244152T3 (en)
    FR (1) FR2774149B1 (en)

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    FR2804495B1 (en) 2000-01-31 2002-06-07 Valeo Vision MOTOR VEHICLE HEADLIGHT, INCLUDING A CROSS-SECTIONAL SOURCE, AND CAPABLE OF GENERATING A BEAM WITH NON-RECTILLINE CUT
    FR2808867B1 (en) 2000-05-11 2002-08-23 Valeo Vision BI-FUNCTIONAL PROJECTOR WITH SINGLE LIGHT SOURCE AND MOBILE OCCULTER FOR MOTOR VEHICLE
    FR2819042B1 (en) 2000-12-28 2003-03-14 Valeo Vision VEHICLE PROJECTOR COMPRISING A REFLECTOR AND A HORIZONTAL LIGHT SOURCE ORIENTED TRANSVERSELY TO AN OPTICAL AXIS OF THE REFLECTOR
    DE10224812B4 (en) * 2002-06-05 2010-01-28 Automotive Lighting Reutlingen Gmbh Motor vehicle headlamps
    FR2865021B1 (en) * 2004-01-13 2007-03-16 Valeo Vision VERTICALIZED PROJECTOR FOR MOTOR VEHICLE.
    FR2982929B1 (en) * 2011-11-22 2014-01-17 Valeo Vision LIGHT EMITTING DEVICE FOR MOTOR VEHICLE PROJECTOR

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    FR609148A (en) 1925-05-29 1926-08-09 Budd Edward G Mfg Co Improvements to roller levelers
    FR2516203B1 (en) * 1981-11-12 1986-03-14 Cibie Projecteurs MOTOR VEHICLE PROJECTOR
    FR2536503B1 (en) 1982-11-19 1987-12-31 Cibie Projecteurs FOG SPOTLIGHT FOR MOTOR VEHICLE
    FR2536502B1 (en) 1982-11-19 1987-01-09 Cibie Projecteurs CROSSING PROJECTOR FOR MOTOR VEHICLE
    IT8552923V0 (en) * 1985-01-30 1985-01-30 Comind Spa LAMINAR BEAM PROJECTOR COLARMENTALLY FOR VEHICLES
    FR2599121B1 (en) 1986-05-26 1988-09-16 Cibie Projecteurs OFFSET MIXED CROSSING PROJECTOR
    FR2602305B1 (en) 1986-08-04 1990-03-23 Cibie Projecteurs FOG PROJECTOR WITH TRANSVERSE FILAMENT FOR MOTOR VEHICLE
    FR2602306B1 (en) 1986-08-04 1988-11-10 Cibie Projecteurs CROSS-ROAD PROJECTOR WITH TWO CROSS-FILAMENTS FOR A MOTOR VEHICLE
    FR2609148B1 (en) 1986-12-30 1991-07-12 Cibie Projecteurs MOTOR VEHICLE PROJECTOR COMPRISING A REFLEXER WITH A MODIFIED BOTTOM COMPLEX SURFACE
    FR2609146B1 (en) 1986-12-30 1990-01-05 Cibie Projecteurs MOTOR VEHICLE PROJECTOR COMPRISING A MODIFIED BACKGROUND PARABOLIC REFLECTOR
    FR2639888B1 (en) 1988-12-07 1993-08-13 Valeo Vision MOTOR VEHICLE PROJECTOR COMPRISING A REFLECTOR WITH A COMPLEX SURFACE WITH MODIFIED INTERMEDIATE AREAS
    FR2657680B1 (en) * 1990-01-26 1993-02-05 Valeo Vision MOTOR VEHICLE HEADLIGHT COMPRISING AN IMPROVED LIGHT SOURCE.
    FR2664667B1 (en) 1990-07-12 1993-07-16 Barca Didier VIBRATION DAMPING DEVICE.
    FR2664677A1 (en) 1990-07-13 1992-01-17 Valeo Vision REFLECTOR FOR A LIGHTING DEVICE OF A MOTOR VEHICLE, AND PROJECTOR AND SIGNALING LIGHT INCORPORATING SUCH A REFLECTOR.
    FR2710393B1 (en) 1993-09-24 1995-12-15 Valeo Vision Smooth glass headlamp, in particular for a motor vehicle, and method for manufacturing the reflector of such a headlamp.
    GB2284658B (en) * 1993-12-09 1997-07-16 Koito Mfg Co Ltd Headlamp for an automobile

    Also Published As

    Publication number Publication date
    ES2244152T3 (en) 2005-12-01
    FR2774149A1 (en) 1999-07-30
    DE69926090T2 (en) 2006-04-20
    FR2774149B1 (en) 2000-04-14
    DE69926090D1 (en) 2005-08-18
    EP0933586A1 (en) 1999-08-04

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