EP0933586A1 - 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
EP0933586A1
EP0933586A1 EP99400185A EP99400185A EP0933586A1 EP 0933586 A1 EP0933586 A1 EP 0933586A1 EP 99400185 A EP99400185 A EP 99400185A EP 99400185 A EP99400185 A EP 99400185A EP 0933586 A1 EP0933586 A1 EP 0933586A1
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EP
European Patent Office
Prior art keywords
mirror
source
projector according
horizontal
zone
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.)
Granted
Application number
EP99400185A
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German (de)
French (fr)
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EP0933586B1 (en
Inventor
Benoít Reiss
Pierre Albou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
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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Publication of EP0933586B1 publication Critical patent/EP0933586B1/en
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Expired - Lifetime legal-status Critical Current

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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 automotive headlights, and more precisely a projector capable of emitting a cut-off beam, at least part of the cut presents an oblique inclination, typically at 15 °, relative to the horizontal.
  • Such a cut is for example that defined by European regulations on the subject, and includes, for a right-hand traffic direction, a left half-way horizontal and a straight half-cut raised 15 ° above of the horizontal.
  • One of the aims of such an orientation is to make projectors whose mirror has a height dimension at least equal, or even substantially greater than its width dimension.
  • FR-A-2 602 305 the description of a mirror able 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 transverse sources for generate a passing beam and a main beam conforming to United States regulations from America, the passing beam being delimited by a cut formed by two horizontal half-planes offset in height.
  • the present invention aims to overcome these limitations of the state of the art.
  • a mirror 20 intended to project infinitely a light beam of light, this mirror receiving in its background a light source constituted by the species by the generally cylindrical filament 10 of 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 sheet, and the axis of the filament extends horizontally in this case.
  • each point of the mirror 20 goes generate an image of the source 10 whose orientation, in a projection plane perpendicular to the axis optics of the mirror, will depend on the coordinates of this point.
  • a first element of the approach leading to the present invention is to locate on the surface of the mirror the points which 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 counterclockwise rotation, so that you can then positioning these images appropriately, generating minus part of the half cut inclined at 15 ° by one standardized European passing beam.
  • FIG. 1 illustrates in back elevation the case study of a mirror 20 having a reflecting surface in the form of a paraboloid of revolution focused in the center of a transverse filament 10, and we have identified on this surface a certain number of lines of points on the surface (L N ) generating images whose major axes all have the same inclination of N degrees relative to the horizontal.
  • Bold are the lines L 15 corresponding to inclinations of source images oriented at 15 ° in one direction or the other with respect to the horizontal.
  • FIG. 2 illustrates in rear view a quarter of a mirror 20, which is constituted by 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 generator of this quarter mirror, as well as the position of the focal point F.
  • a zone Z of the mirror bordering the line L15 will allow, with the parabolic surface described above, to generate images of the filament which in a projection screen, will rotate around their edge lateral homologous to the edge of the filament to which the focus and within angular limits located on either side otherwise the value of 15 °, these images being located at right of the screen reference center.
  • Such a surface is therefore suitable for initiating the upward cut at 15 °, and at the same time to create a spot of concentration immediately below this cut, as we will see in detail later in an embodiment of the present invention.
  • the cylindrical filament 10 which can typically consist of either the transverse filament a H3 standard lamp mounted axially at the bottom of the mirror, either of the axial filament of an H1 or H7 lamp laterally mounted in the mirror.
  • the high and low vertical generators, 20h and 20b respectively, of the mirror 20 are designed to so as to bring all the images of the filament 10 below and essentially flush with the horizontal level, so as to be able to generate, as we will see in detail further on, clear cut beams of good quality.
  • these vertical generators are constructed by drawing lines D1 tangent to the surface of the filament 10, these straight lines being on the side back of the filament with regard to the generator superior 20h, and being on the front side of the filament for the generator 20b.
  • each of these lines D1 corresponding to a light ray emitted by an edge of the filament 10, are respectively associated with 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 up close close, starting from the bottom of the mirror 20 which is fixed at a predetermined dimension relative to the filament, from different lines TG obtained, to define a curved line, which will be called in the following "Evolutionary generator” insofar as it does not does not have a fixed hearth, but a set of hearths that evolve gradually as you move along said generator.
  • Evolutionary generator insofar as it does not does not have a fixed hearth, but a set of hearths that evolve gradually as you move along said generator.
  • FIG. 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 a certain defocus by compared to source 10. These images define a very good horizontal cut.
  • the different zones have relatively similar widths, and typically between 6 and 13 mm, and are characterized for the essential by horizontal generators different, defined according to the lateral offset and of the desired spread of light.
  • central zones 215 and 225 which generate filament 10 images that are horizontal or very slightly inclined with respect to the horizontal, are intended to perform the horizontal cut over an area important.
  • Their horizontal generator is advantageously a straight line.
  • zones 214, 226 either made up of pieces of satellite dishes, or with horizontal and vertical generators of different hearths (the position of the hearth of the generator horizontal determining in particular the positioning symmetrical or dissymmetrical images by relative to the axial vertical plane passing through the center of projection screen reference), either again and preferably with a horizontal generator parabolic and an evolving vertical generator such as described above with reference to Figure 4.
  • Figures 8 and 9 illustrate the case where the area 214 is a surface generated by dragging the vertical generator of Figure 4, in such a way that it remains parallel to the plane y0z, on a generator horizontal formed by a piece of parabola whose hearth F is located behind 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 zone 214 has an offset O'y 'axis laterally with respect to the main axis 0y of the mirror, so that the focal point F is brought closer to the lateral end of the filament 10 opposite the side in which is the area 214, while the generator vertical is always of the type illustrated on the figure 4.
  • the resulting images are illustrated on the Figure 13, and we observe that the lateral shift of the focus F creates an image shift on the side of the half-cut inclined Hc, as well as a spot of concentration below this half-cut Hc, so as to better light the side of the road.
  • Another solution is to create 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 if necessary of the streaks having the same function as those projected on the mirror as indicated above.
  • the other areas of the mirror 20 in FIG. 7 are used to provide light distribution satisfactory light in the different areas of the beam.
  • we adapt the horizontal generators of these zones which are same preference for the upper zone and for the lower area so as to avoid discontinuities likely to cause optical defects.
  • the other areas may possibly present, depending on the function which is assigned to them, surfaces of different types, and in particular 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, on behalf of the Applicant.
  • Figures 14 to 22 illustrate by sets of isocandela curves the beam parts that are by example generated by zones 214, 213, 212, 211, 216, 217, 218, 219 and 215 of the mirror of Figure 7, while Figures 23 and 24 illustrate the shape obtained in superimposing the beam parts of the Figures 14 to 17 and the beam parts of Figures 18 at 21.
  • Figure 25 illustrates the appearance of the beam generated by the upper half of the mirror Figure 11, while Figure 26 illustrates the pace of the beam part generated by its half lower.
  • Figure 27 illustrates the beam pattern overall obtained. We observe that it is a beam having all the qualities required in terms of width, thickness and concentration in the axis of the road.
  • the present invention allows to achieve, through the use of a transverse source and to the different areas as described above, mirrors for European passing beam whose width is significantly less than 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 which mainly includes a source luminous 10, such as the filament of a lamp with incandescent or arc of a discharge lamp, a first mirror 40, a mask 30, a second mirror 20 and a mirror 50.
  • a source luminous 10 such as the filament of a lamp with incandescent or arc of a discharge lamp
  • first mirror 40 such as the filament of a lamp with incandescent or arc of a discharge lamp
  • a first mirror 40 such as the filament of a lamp with incandescent or arc of a discharge lamp
  • a first mirror 40 such as the filament of a lamp with incandescent or arc of a discharge lamp
  • a first mirror 40 such as the filament of a lamp with incandescent or arc of a discharge lamp
  • a first mirror 40 such as the filament of a lamp with incandescent or arc of a discharge lamp
  • mask 30 such as the filament of a lamp with incandescent or arc of a discharge
  • the projector also includes, as in the case previous and not illustrated but classic in self, a box and various auxiliary fittings for mounting, electrical connection, etc.
  • the source 10 is positioned on the high focus F1 or in its immediate vicinity. Preferably, in the case from 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, produced for example in 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 the low focal point F2 of the mirror 40 or in its immediate vicinity, and is positioned in such a way that the F2 focus is located at the right of the opening 31. It will be noted here that the preferred orientation from the actual source 10 as described above is the more suitable for homogeneous "filling" aperture 31 with light reflected from the mirror 20.
  • the mirror 20 is a beam-forming mirror lighting which is for example similar to half bottom of the 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 the mask to form the European passing beam.
  • a mask 30 with an opening 31 including the major axis extends transversely to the optical axis AO of the projector allows to generate beams altogether satisfactory with a mirror 20 whose height is important, and typically at least as large as its width.
  • the virtual source is plane allows to build at the level of the mirror 20 a optical surface which generates a clear cut beam in a simpler way than with the source three-dimensional view of the previous embodiment.
  • a planar source makes this form invariable, and in this case in the form of a parallelogram, whatever the observation point.
  • FIGS. 28 to 30 we have shown a concrete embodiment of the mirror 20 of a headlight of the type shown in FIGS. 28 to 30. It is subdivided into two zones, namely a zone upper 20a and a lower area 20b, the height of the zone 20b preferably being substantially greater than that of zone 20a.
  • these subzones are formed by the orthogonal projection of striations such as cylindrical striations of axes vertical, on a base surface which is for example type defined in documents FR-A-2 536 502 and FR-A-2 536 503.
  • Such a projected stripe mirror is described in particular in document FR-A-2 710 393.
  • the upper zone 20a generates, with in this case seven individual subzones 21a to 27a, beam portions of large width, with projected streaks with a relatively radius of curvature low.
  • This area close to the defined virtual source through opening 31, in effect generates images relatively large from the source, hardly conducive to creation well defined areas of concentration in the beam, but on the contrary conducive to giving it the desired width.
  • the lower region 20b of the mirror which generates smaller images of the source, on the contrary consisting of sub-areas 21b to 25b ensuring spreading less important, or even practically zero, so as to create in the beam a spot of appropriate intensity concentration in the axis of the road.
  • relatively large sub-area 24b is produced in accordance with the invention to create on a extent limited to the half-cut at 15 °, for example in using as described above a surface generally parabolic whose focus is judiciously positioned.
  • the projector makes it possible to generate a beam quite satisfactory especially in terms definition of cut.
  • sub-area 24b which defines the inclined half cut extends between the edge lower of the mirror and a level located not at the source height, but noticeably below this can of course also be implemented, for one of the zones 214, 226 or for both, in the embodiment of Figure 7. This avoids work with more inclined images of the filament as 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)

Abstract

The lamp includes the source mounted transversely w.r.t. the mirror axis. The headlamp for a motor vehicle comprises a light source (10) and a mirror (20) and a cover glass. The light source is orientated transversely w.r.t. the optical axis of the mirror. The mirror includes at least one region (Z) which is designed to generate images of the source, with an inclination which varies in a limited interval about a given inclination w.r.t. the horizontal. An optical correction system is designed to position these images along the length of an inclined part of the a cut through the beam, generated by the mirror. The inclination of this part corresponds to the given inclination of the images.

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 automotive headlights, and more precisely a projector capable of emitting a cut-off beam, at least part of the cut presents an oblique inclination, typically at 15 °, relative 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 cut is for example that defined by European regulations on the subject, and includes, for a right-hand traffic direction, a left half-way horizontal and a straight half-cut raised 15 ° above of 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 capable projectors to generate by themselves, cooperating with a source elongated light oriented axially, 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.Mention will in particular be made of the 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 Claimant.

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 generally give satisfaction, are however of such a conception that it is difficult for them to achieve the desired result in cut-off terms if the source, such as the filament cylindrical of an incandescent lamp, is not axially oriented, i.e. parallel to the axis mirror optics.

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.Now we are trying to achieve projectors in which the source is oriented in the always horizontally mirror, 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.One of the aims of such an orientation is to make projectors whose mirror has a height dimension at least equal, or even substantially greater than 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.Certainly the Applicant has also developed reflective surfaces capable of generating with a source with such an orientation, and without resorting to cups or the like obscuring part of the radiation emitted by the source, cut-off beams. One thus finds in FR-A-2 602 305 the description of a mirror able 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 transverse sources for generate a passing beam and a main beam conforming to United States regulations from America, the passing beam being delimited by a cut formed by two horizontal half-planes offset in height.

Mais il n'existe dans l'état de la technique aucune solution pour engendrer, avec une telle source transversale, un faisceau de type européen.However, there is no prior art solution to generate, with such a source transverse, a European type beam.

La présente invention vise à pallier ces limitations de l'état de la technique.The present invention aims to overcome these limitations of the state of the art.

Elle propose à cet effet un projecteur de véhicule automobile tel que défini dans la revendication 1.To this end, it 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 projector according to the invention are defined in 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, aims and advantages of the present invention will appear better on reading the following detailed description of preferred embodiments thereof, this one given by way of nonlimiting example and made with reference to the accompanying drawings, in which :
  • FIG. 1 is a rear view of a projector mirror, and of the associated source, making it possible to explain the behavior of the mirror in terms of the inclination of the images generated,
  • FIG. 2 is a partial back view of another kind of mirror and its source, illustrating the same type of behavior,
  • FIG. 3 is a schematic sectional view of the mirror part and of the source of FIG. 2,
  • FIG. 4 is a view in axial vertical section 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 zones of the mirror of FIG. 7,
  • FIG. 10 illustrates the distribution of source images obtained with the area 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 source images obtained with the area designed according to FIGS. 11 and 12,
  • FIGS. 14 to 27 illustrate by sets of isocandela curves the photometric behavior of different zones of the mirror of FIG. 7 and its overall behavior,
  • FIG. 28 is a view in axial vertical section of a headlamp 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 masking element of the projector of FIGS. 28 and 29, and
  • FIG. 31 illustrates a front view of a concrete embodiment of a projector mirror from FIGS. 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 intended to project infinitely a light beam of light, this mirror receiving in its background a light source constituted by the species by the generally cylindrical filament 10 of 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 sheet, and the axis of the filament extends horizontally in this case.

    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 goes generate an image of the source 10 whose orientation, in a projection plane perpendicular to the axis optics of the mirror, will depend on the coordinates of this point. A first element of the approach leading to the present invention is to locate on the surface of the mirror the points which 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 counterclockwise rotation, so that you can then positioning these images appropriately, generating minus part of the half cut inclined at 15 ° by one 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 paraboloïde 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 back elevation the case study of a mirror 20 having a reflecting surface in the form of a paraboloid of revolution focused in the center of a transverse filament 10, and we have identified on this surface a certain number of lines of points on the surface (L N ) generating images whose major axes all have the same inclination of N degrees relative to the horizontal. Bold are the lines L 15 corresponding to inclinations of source images 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 :
       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.
    It is therefore understood that a zone Z of the mirror, as indicated by hatching, will generate images of the source all having an inclination which varies within relatively narrow limits around the targeted orientation of 15 °. It is therefore possible:
    using the other parts of the surface of the mirror to form a beam such as a standardized European passing beam, possibly in cooperation with optical arrangements on the ice;
    • to use zone Z specifically to at least initiate the rising half-cut at about 15 ° from the beam, here again possibly in cooperation with the glass.

    La figure 2 illustre en vue de dos un quart d'un miroir 20, qui est constitué par un morceau de paraboloïde 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 rear view a quarter of a mirror 20, which is constituted by 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 generator of this quarter mirror, as well as the position of the focal point 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.We understand that a zone Z of the mirror bordering the line L15 will allow, with the parabolic surface described above, to generate images of the filament which in a projection screen, will rotate around their edge lateral homologous to the edge of the filament to which the focus and within angular limits located on either side otherwise the value of 15 °, these images being located at right of the screen reference center. Such a surface is therefore suitable for initiating the upward cut at 15 °, and at the same time to create a spot of concentration immediately below this cut, as we will see in detail later in an embodiment 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 Figures 4 and 5, which illustrate a mirror / filament assembly to which we are going apply the obtaining of cutoff according to the invention, we have shown the cylindrical filament 10, which can typically consist of either the transverse filament a H3 standard lamp mounted axially at the bottom of the mirror, either of the axial filament of an H1 or H7 lamp laterally mounted 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.The high and low vertical generators, 20h and 20b respectively, of the mirror 20 are designed to so as to bring all the images of the filament 10 below and essentially flush with the horizontal level, so as to be able to generate, as we will see in detail further on, clear cut beams 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.Preferably, and with reference to particular to figure 4, these vertical generators are constructed by drawing lines D1 tangent to the surface of the filament 10, these straight lines being on the side back of the filament with regard to the generator superior 20h, and being 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 ray emitted by an edge of the filament 10, are respectively associated with 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 straight line TG which 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 up close close, starting from the bottom of the mirror 20 which is fixed at a predetermined dimension relative to the filament, from different lines TG obtained, to define a curved line, which will be called in the following "Evolutionary generator" insofar as it does not does not have a fixed hearth, but a set of hearths that evolve gradually as you move along said generator. These generators are distinguish in this way from generators with fixed focus, that is to say dishes, 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 therefore play on the one hand on the size of the images of the filament generated, and on the other hand on the amount of luminous flux that the mirror recovers over 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 is easy to solve by means of computer-aided calculation, 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, resulted in each image of the filament 10 which it generates is located 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.FIG. 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 a certain defocus by compared to source 10. These images define a very good horizontal cut.

    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 figure 2, one can realize a passing beam conforming 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 Figure 7 a concrete embodiment of a mirror defined with the vertical generator described above with reference to FIG. 4, but capable of generating by itself, that is to say without the intervention of ice closing, a European type passing beam with the required horizontal width. It is generated by dividing the mirror 20 into different zones as illustrated 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 half upper 21 and lower half 22, which have each nine zones, 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 essential by horizontal generators different, defined according to the lateral offset and of the desired spread of 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 which generate filament 10 images that are horizontal or very slightly inclined with respect to the horizontal, are intended to perform the horizontal cut over an area important. Their horizontal generator 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 set out above with reference to FIGS. 1 to 3, and respectively encompass the major 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 15 ° half-cut typical 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 zones immediately below the half-cut inclined is preferably carried out as described upper. So we can use zones 214, 226 either made up of pieces of satellite dishes, or with horizontal and vertical generators of different hearths (the position of the hearth of the generator horizontal determining in particular the positioning symmetrical or dissymmetrical images by relative to the axial vertical plane passing through the center of projection screen reference), either again and preferably with a horizontal generator parabolic and an evolving vertical generator such as described above with reference to Figure 4.

    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.Figures 8 and 9 illustrate the case where the area 214 is a surface generated by dragging the vertical generator of Figure 4, in such a way that it remains parallel to the plane y0z, on a generator horizontal formed by a piece of parabola whose hearth F is located behind filament 10, and to the right from its center. This results in the distribution of images as illustrated in Figure 10, which is observed that it initiates with clarity both the half-cut horizontal hH of the beam and its rising half-cut Hc, and that she participates in a spot of concentration 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 zone 214 has an offset O'y 'axis laterally with respect to the main axis 0y of the mirror, so that the focal point F is brought closer to the lateral end of the filament 10 opposite the side in which is the area 214, while the generator vertical is always of the type illustrated on the figure 4. The resulting images are illustrated on the Figure 13, and we observe that the lateral shift of the focus F creates an image shift on the side of the half-cut inclined Hc, as well as a spot of concentration below this half-cut Hc, so as to better light 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.A person skilled in the art will be able to easily transpose the description above in the case of zone 226, having the same role, located in the lower half of the mirror. The if necessary, and material to enlarge the stain of concentration and the definition of the half-cut inclined, it may be advantageous to use, for horizontal generators of zones 214 and 226, fireplaces F positioned differently, one can be find for example to the right of a point located between the center of the filament and one of its edges, and the other which 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 similar to that illustrated in Figures 10 and 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, we can plan to realize the area 214 by giving it a base surface located in the continuity, and with the same equations, as the surfaces adjacent areas of the mirror, as we will describe further, and by applying on these surfaces base, by projection along the axis Oy, of the elements corrective optics such as prisms and the case appropriate streaks intended 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 create 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 if necessary of the 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 areas of the mirror 20 in FIG. 7 are used to provide light distribution satisfactory light in the different areas of the beam. To do this, we adapt the horizontal generators of these zones, which are same preference for the upper zone and for the lower area 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.It will be observed here that if the generatrices of different adjacent areas connect to each other continuously (but not necessarily so differentiable), then the surface of the mirror is also continues to the extent that 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.It will also be observed that, if the central zones 215, 225 present the vertical generator such that described with reference to Figure 2, the other areas may possibly present, depending on the function which is assigned to them, surfaces of different types, and in particular 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, on behalf of the 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 isocandela curves the beam parts that are by example generated by zones 214, 213, 212, 211, 216, 217, 218, 219 and 215 of the mirror of Figure 7, while Figures 23 and 24 illustrate the shape obtained in superimposing the beam parts of the Figures 14 to 17 and the beam parts 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 appearance of the beam generated by the upper half of the mirror Figure 11, while Figure 26 illustrates the pace of the beam part generated by its 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 beam pattern overall obtained. We observe that it 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.We observe in particular in Figure 14 the light distribution obtained with zone 214 of the mirror, resulting from a distribution of images of the type of that 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 allows to achieve, through the use of a transverse source and to the different areas as described above, mirrors for European passing beam whose width is significantly less than 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.Figures 28 to 30 show a projector which mainly includes a source luminous 10, such as the filament of a lamp with incandescent or arc of a discharge lamp, a first mirror 40, a mask 30, a second mirror 20 and a mirror 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 not illustrated but classic in self, a box 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 genus, of major axis essentially vertical, and has a first F1 focus or high focus and a second F2 focus or low focus.

    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 from 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, produced for example in 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 the low focal point F2 of the mirror 40 or in its immediate vicinity, and is positioned in such a way that the F2 focus is located at the right of the opening 31. It will be noted here that the preferred orientation from the actual source 10 as described above is the more suitable for homogeneous "filling" aperture 31 with light reflected from 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 which is for example similar to half bottom of the 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 the 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, the use of a mask 30 with an opening 31 including the major axis extends transversely to the optical axis AO of the projector allows to generate beams altogether satisfactory with a mirror 20 whose height is important, and typically at least as large 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 the level of the mirror 20 a optical surface which generates a clear cut beam in a simpler way than with the source three-dimensional view 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, the use of a planar 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 in this case be a simple piece of dish whose focal point Fb is placed at the level of the leading edge (i.e. closest to glass 50) of the opening 31 of the mask 30, which has the effect to bring all the images from the virtual source below 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, we have shown a concrete embodiment of the mirror 20 of a headlight of the type shown in FIGS. 28 to 30. It is subdivided into two zones, namely a zone upper 20a and a lower area 20b, the height of the zone 20b preferably being 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 extending side by side, each sub-area 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 subzones are formed by the orthogonal projection of striations such as cylindrical striations of axes vertical, on a base surface which is for example type defined in documents 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 stripe mirror is described in particular in document 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 subzones 21a to 27a, beam portions of large width, with projected streaks with a relatively radius of curvature low. This area, close to the defined virtual source through opening 31, in effect generates images relatively large from the source, hardly conducive to creation 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 region 20b of the mirror, which generates smaller images of the source, on the contrary consisting of sub-areas 21b to 25b ensuring spreading less important, or even practically zero, so as to create in the beam a spot of appropriate intensity concentration 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, relatively large sub-area 24b is produced in accordance with the invention to create on a extent limited to 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 makes it possible to generate a beam quite satisfactory especially in terms definition of cut.

    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 peculiarity of this embodiment, whereby sub-area 24b which defines the inclined half cut extends between the edge lower of the mirror and a level located not at the source height, but noticeably below this can of course also be implemented, for one of the zones 214, 226 or for both, in the embodiment of Figure 7. This avoids work with more inclined images of the filament as 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 by no means limited to the embodiments described and represented, but the skilled person will be able to bring it any variant or modification in accordance with its spirit.

    Claims (15)

    Projecteur de véhicule automobile, comprenant une source lumineuse (10 ; 31), un miroir (20) et une glace (50), la source étant orientée essentiellement transversalement à un axe optique du miroir, caractérisé en ce que le miroir comprend, dans au moins une zone (214, 226 ; 24b) apte à engendrer des images de la source présentant une inclinaison variant dans un intervalle limité autour d'une inclinaison donnée par rapport à l'horizontale, des moyens de correction optique aptes à positionner lesdites images le long d'une partie inclinée (Hc) d'une coupure du faisceau engendré par ledit miroir, dont l'inclinaison correspond à ladite inclinaison donnée des images.Motor vehicle headlight, comprising a light source (10; 31), a mirror (20) and a glass (50), the source being oriented essentially transversely to an optical axis of the mirror, characterized in that the mirror includes, in at least one area (214, 226; 24b) able to generate images of the source having an inclination varying in an interval limited around a given inclination with respect to horizontal, optical correction means capable of positioning said images along an inclined part (Hc) of a cut in the beam generated by said mirror, whose inclination corresponds to said given inclination images. Projecteur selon la revendication 1, caractérisé en ce que la source (10 ; 31) est orientée horizontalement.Projector according to claim 1, characterized in that the source (10; 31) is oriented horizontally. Projecteur selon la revendication 2, caractérisé en ce que la source (10) est une source réelle en volume.Projector according to claim 2, characterized in that the source (10) is a source real in volume. Projecteur selon la revendication 3, caractérisé en ce que la source s'étend à une hauteur intermédiaire entre les bords supérieur et inférieur du miroir, et en ce que les moyens de correction optique sont prévus dans deux zones (214, 226) du miroir situées respectivement dans deux quadrants opposés du miroir. Projector according to claim 3, characterized in that the source extends to a height intermediate between the upper and lower edges of the mirror, and in that the optical correction means are provided in two areas (214, 226) of the mirror located respectively in two opposite quadrants of the mirror. Projecteur selon la revendication 2, caractérisé en ce que la source est une source plane.Projector according to claim 2, characterized in that the source is a planar source. Projecteur selon la revendication 5, caractérisé en ce que la source est définie à partir d'une lumière issue d'une source réelle (10) et projetée à partir d'un motif plan donné (31), et en ce que les moyens de correction optique sont prévus dans une zone (24b) du miroir décalée latéralement et s'éloignant verticalement de ladite source.Projector according to claim 5, characterized in that the source is defined from light from a real source (10) and projected from a given planar pattern (31), and in that the optical correction means are provided in an area (24b) of the mirror shifted laterally and moving away vertically from said source. Projecteur selon l'une des revendications 5 et 6, caractérisé en ce que la ou chaque zone (214, 226 ; 24b) du miroir s'étend entre un bord supérieur ou inférieur du miroir et un plan essentiellement horizontal (x0y) passant au voisinage de la source plane (31).Projector according to one of claims 5 and 6, characterized in that the or each zone (214, 226; 24b) of the mirror extends between an upper edge or bottom of the mirror and an essentially horizontal plane (x0y) passing in the vicinity of the planar source (31). Projecteur selon l'une des revendications 5 et 6, caractérisé en ce que la ou chaque zone (214, 226 ; 24b) du miroir s'étend entre un bord supérieur ou inférieur du miroir et une limite située à distance d'un plan essentiellement horizontal passant au voisinage de la source plane.Projector according to one of claims 5 and 6, characterized in that the or each zone (214, 226; 24b) of the mirror extends between an upper edge or lower of the mirror and a limit located at a distance of essentially horizontal plane passing in the vicinity of the plane source. Projecteur selon l'une des revendications 1 à 8, caractérisé en ce que la ou chaque zone (214, 226 ; 24b) présente, en vue de face du miroir, un contour essentiellement rectangulaire de grand axe généralement vertical.Projector according to one of claims 1 to 8, characterized in that the or each zone (214, 226; 24b) has, in front view of the mirror, an outline essentially rectangular with a major axis generally vertical. Projecteur selon l'une des revendications 1 à 9, caractérisé en ce que les moyens de correction sont constitués par une surface de la ou de chaque zone, qui possède une génératrice horizontale essentiellement parabolique.Projector according to one of claims 1 to 9, characterized in that the correction means are formed by a surface of the or each zone, which basically has a horizontal generator parabolic. Projecteur selon la revendication 10 prise en combinaison avec l'une des revendications 3 et 4, caractérisé en ce que ladite surface présente une génératrice verticale telle qu'un rayon lumineux (D1) émis tangentiellement par un bord de la source est réfléchi (D2) parallèlement audit axe optique, les rayons lumineux émis par le reste de la source étant réfléchis avec une inclinaison vers le bas par rapport audit axe optique.Projector according to claim 10 taken combination with one of claims 3 and 4, characterized in that said surface has a vertical generator such as a light ray (D1) emitted tangentially by an edge of the source is reflected (D2) parallel to said optical axis, the rays light emitted by the rest of the source being reflected with a downward inclination relative to said axis optical. Projecteur selon la revendication 10 prise en combinaison avec l'une des revendications 5 à 8, caractérisé en ce que ladite surface présente une génératrice verticale essentiellement parabolique dont le foyer s'étend au voisinage d'un bord de la source plane qui est transversal à l'axe optique.Projector according to claim 10 taken combination with one of claims 5 to 8, characterized in that said surface has a essentially parabolic vertical generator whose hearth extends in the vicinity of an edge of the planar source which is transverse to the optical axis. Projecteur selon l'une des revendications 10 à 12, caractérisé en ce que l'axe (0'y') de la génératrice horizontale est décalé latéralement, par rapport au centre de la source, vers le côté du miroir opposé à celui contenant la zone qui possède cette génératrice horizontale.Projector according to one of claims 10 to 12, characterized in that the axis (0'y ') of the horizontal generator is offset laterally, by towards the center of the source, towards the side of the mirror opposite to the one containing the area that has this horizontal generator. Projecteur selon l'une des revendications 1 à 9, caractérisé en ce que les moyens de correction optique sont constitués par des éléments optiques projetés sur une surface de base de la ou desdites zones (214, 226 ; 24b) prolongeant de façon continue des zones adjacentes.Projector according to one of claims 1 to 9, characterized in that the optical correction means are made up of optical elements projected onto a base surface of the at least one zone (214, 226; 24b) continuously extending adjacent areas. Projecteur selon l'une des revendications 1 à 9, caractérisé en ce que les moyens de correction optique sont constitués par des éléments optiques formés sur la glace du projecteur dans des zones de celle-ci qui sont homologues de la ou desdites zones (214, 226 ; 24b) du miroir.Projector according to one of claims 1 to 9, characterized in that the optical correction means consist of optical elements formed on the projector glass in areas thereof that are counterparts of the said zone (s) (214, 226; 24b) of the mirror.
    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

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

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    DE (1) DE69926090T2 (en)
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    Cited By (3)

    * Cited by examiner, † Cited by third party
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    FR2865021A1 (en) * 2004-01-13 2005-07-15 Valeo Vision Headlight for motor vehicle, has light source with axis that is parallel to or oblique with respect to optical axis of verticalized reflector, where reflector cooperates with source for generating light beam
    DE10224812B4 (en) * 2002-06-05 2010-01-28 Automotive Lighting Reutlingen Gmbh Motor vehicle headlamps
    FR2982929A1 (en) * 2011-11-22 2013-05-24 Valeo Vision LIGHT EMITTING DEVICE FOR MOTOR VEHICLE PROJECTOR

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    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

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    DE10224812B4 (en) * 2002-06-05 2010-01-28 Automotive Lighting Reutlingen Gmbh Motor vehicle headlamps
    FR2865021A1 (en) * 2004-01-13 2005-07-15 Valeo Vision Headlight for motor vehicle, has light source with axis that is parallel to or oblique with respect to optical axis of verticalized reflector, where reflector cooperates with source for generating light beam
    FR2982929A1 (en) * 2011-11-22 2013-05-24 Valeo Vision LIGHT EMITTING DEVICE FOR MOTOR VEHICLE PROJECTOR
    EP2597360A1 (en) * 2011-11-22 2013-05-29 Valeo Vision Light emitting device for a motor vehicle headlamp

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    DE69926090D1 (en) 2005-08-18
    FR2774149A1 (en) 1999-07-30
    FR2774149B1 (en) 2000-04-14
    ES2244152T3 (en) 2005-12-01
    EP0933586B1 (en) 2005-07-13
    DE69926090T2 (en) 2006-04-20

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