EP1267116A1 - Lighting or signalling device - Google Patents

Lighting or signalling device Download PDF

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Publication number
EP1267116A1
EP1267116A1 EP02291426A EP02291426A EP1267116A1 EP 1267116 A1 EP1267116 A1 EP 1267116A1 EP 02291426 A EP02291426 A EP 02291426A EP 02291426 A EP02291426 A EP 02291426A EP 1267116 A1 EP1267116 A1 EP 1267116A1
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EP
European Patent Office
Prior art keywords
light
lighting
light sources
source
secondary source
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.)
Withdrawn
Application number
EP02291426A
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German (de)
French (fr)
Inventor
Benoist c/o Valeo Vision Fleury
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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 EP1267116A1 publication Critical patent/EP1267116A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements
    • 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]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F21S41/145—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device the main emission direction of the LED being opposite to the main emission direction 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
    • F21S41/10—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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled 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
    • F21S41/10—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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • 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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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
    • 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
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/686—Blades, i.e. screens moving in a vertical plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout 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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/40—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/50—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0008—Reflectors for light sources providing for indirect lighting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to lighting or signaling devices, intended in particular but not exclusively to motor vehicles.
  • Such devices include conventionally and schematically a light source emitting light rays which are collected by a reflecting mirror which reflects them towards a closing window and for protecting the lighting or signaling device to form a light beam lighting or signaling.
  • the light sources used may consist of incandescent lamps, halogen lamps or discharge lamps, these different lamps being able to coexist in a spotlight or a fire, each lamp being intended to fulfill a function, that is to say forming the light source at the origin of a beam having a photometry and a geometry predetermined regulations.
  • a global light beam comprising a regulatory cut-off, like a passing light beam or an anti-fog light beam
  • each elementary light beam that is to say generated by a single light source, includes such a cut
  • all elementary cuts exactly overlap to constitute the cut of the light beam global, which would otherwise be unclear, and therefore not in compliance with the regulations.
  • a device comprising several light sources constituted by light-emitting diodes connected in series and each located at the focus of a parabolic reflector.
  • Such a device can provide a signaling beam, but not a lighting beam.
  • WO-97/48 134 Also known from document WO-97/48 134 is a device comprising diodes light emitting devices mounted on a common support, the diodes emitting beams bright in complementary colors, for example amber and green-blue, so that the superimposition of these beams produces a resulting beam of white color.
  • An ice cream colored can be arranged to give a particular color to the beam emerging from the device, which again can provide a signaling beam, but not a beam lighting.
  • Document EP-A-0 158 330 also discloses a lighting device comprising several identical modules aligned, each module comprising a light source and a reflector. A common glass is placed in front of all the modules, so as to ensure the spatial distribution of the beam resulting from the superposition of the beams created by each module, so as to obtain for example a driving beam or a passing beam. The individual modules must then be positioned in relation to each other and by compared to ice with extreme precision to obtain for example a passing beam with clear cut.
  • the present invention is placed in this context and it aims to provide a device lighting or signaling using several light sources to form a light beam in accordance with predetermined regulations, the assembly of sources and their positioning in relation to the other elements of the lighting or signaling device helping to form this light beam being simple and reliable, the device lighting or signaling thus designed being inexpensive.
  • the present invention therefore relates to a lighting or signaling device, comprising at least two light sources, each light source being associated with a first optical system.
  • each first optical system forms a finite distance a real image of the light source, the images of the light sources being confused with a common place constituting a secondary source, and a second optical system having a optical axis passing through the secondary source forms a beam from this secondary source lighting or signaling.
  • Figure 1 a schematic sectional view of a first mode of realization of the present invention.
  • light sources 10A and 10B arranged on a frustoconical crown 12 of axis of revolution Oy. Only two sources have been shown for clarity of design, but it is obvious that this invention applies to any number, greater than or equal to two, of light sources, evenly distributed over the crown 12 around the axis Oy.
  • Convergent lenses 14 are arranged at a distance from the light sources 10A, 10B, ..., so as to collect the light rays emitted by them and to form images thereof 11A, 11B, ....
  • the lenses 14 are all identical, and they can be carried by a common support
  • the images 11A, 11B, ... are merged into a common place S, so that all the rays emitted by sources 10A, 10B, ..., and having passed through the lenses 14, all converge in this common place S.
  • the common place S therefore constitutes a secondary source of light rays resulting from the superposition of images 11A, 11B, ... from sources 10A, 10B, ....
  • the secondary source S can then serve as the main source to give birth to a lighting or signaling beam.
  • a converging lens L so that its object focus is also confused with the common place S.
  • the optical axis of the lens L is advantageously coincident with the axis Oy.
  • the lens L therefore forms an image at infinity of the commonplace S, which thus provides a beam lighting or signaling, which can be easily made to comply with regulations predetermined by choosing sources 10A, 10B, ..., of intensity appropriate to the lighting or signaling function desired.
  • the present invention makes it possible, for example, to obtain in a particularly simple manner a light beam with a clear cut, despite the use of several sources bright.
  • the lens L forms a beam of rays which are parallel, or substantially parallel. It is then possible to have downstream (in the direction of progression of the light rays) of lens L a lens G, shown in dashed lines in FIG. 1, provided with streaks or deflecting elements such as Fresnel prisms, to obtain the distribution in a known manner desired space for rays emerging from ice G.
  • the cover C thus has an edge, located in the immediate vicinity of the common place S, and therefore in the focal plane of the lens L.
  • the lens L therefore forms at infinity the image of the edge of the cover C, which constitutes the cut-off of the light beam emitted by the lens L.
  • We can advantageously plan to make the cover mobile for example mobile in rotation around of an axis perpendicular to the optical axis Oy, between two positions, a first position in which it intercepts part of the light rays constituting the secondary source for obtain a cut-off beam such as a passing beam, and a second position in which it lets pass all the light rays coming from the secondary source, to obtain a uninterrupted beam such as a driving beam.
  • FIG. 2 a schematic sectional view of a variant of the first embodiment of the present invention which has just been described.
  • light sources 10A and 10B arranged on a ring 12, which in this variant can be a flat or frustoconical ring, of axis of revolution Oy. Only two sources have been shown for clarity of the drawing, but it is obvious that the present invention applies to any number, greater than or equal to two, of light sources, evenly distributed over the crown or ring 12 around the axis Oy.
  • the optical systems forming real images of the light sources 10A, 10B, ... are portions of ellipsoids 24, arranged in a corolla around the axis Oy, in such a way that their first foci coincide with sources 10A, 10B, ..., and that their second hearths are confused between them on the axis Oy and with the hearth object of the lens L.
  • ellipsoid should be understood as designating a global surface is close to that of an ellipsoid of revolution, i.e. a surface whose section through a plane passing through the two foci is a portion of an ellipse or approaches of a portion of ellipse, but whose eccentricity can vary from one section plane to another, the surface may include areas of limited extent, the section of which deviates from that a portion of an ellipse.
  • the light rays coming from the different sources 10A, 10B, ... all converge on the commonplace S, which still constitutes a secondary source of light rays resulting from the superposition of images 11A, 11B, ... sources 10A, 10B, ....
  • the secondary source S serves as the main source to give birth, by the lens L whose object focus coincides with the secondary source S, to a lighting or signaling beam, which can be easily made to conform to a predetermined regulation by choosing sources 10A, 10B, ..., of appropriate intensity to the desired lighting or signaling function.
  • a desired spatial distribution beam for example a cut-off beam, using a deflecting glass G, or a cover C, possibly movable between two positions.
  • FIG. 3 a schematic sectional view of a second mode of realization of the present invention.
  • the light sources 10A and 10B are still arranged on a frustoconical crown 12 of axis of revolution Oy.
  • the present invention applies to any number, greater or equal to two, from light sources, distributed regularly on the crown 12 around the axis Oy.
  • converging lenses 14 are arranged away from light sources 10A, 10B, ..., so as to form real images thereof 11A, 11B, ....
  • the images 11A, 11B, ..., are again confused in a common place S, so that all the rays emitted by sources 10A, 10B, ..., and having passed through lenses 14, all converge in this commonplace S, which then constitutes the secondary source S of light rays resulting from the superposition of images 11A, 11B, ... of sources 10A, 10B, ... and which can then be used as the main source to give birth to a lighting or signaling beam.
  • the optical system used to form the beam lighting or signaling from source S consists of a reflective surface A.
  • the reflective surface R can consist of a conventional spotlight reflector lighting or signaling light, i.e. a concave surface, the secondary source S playing the role of a classic lamp.
  • the reflective surface R can then be considered as the surface of a paraboloid of revolution.
  • This dish of revolution is arranged so that its optical axis coincides with the axis Oy of symmetry in relation to which the light sources 10A, 10B, etc. are arranged, and that its focus is confused with the secondary source S.
  • the reflecting surface R being convex, it transforms the secondary source S, formed real images of light sources 10A, 10B, ..., into a virtual object, the surface of which reflective R gives a real image, located at infinity in the case of a paraboloid of revolution, which thus provides a lighting or signaling beam, which can be rendered easily complies with predetermined regulations by choosing 10A sources, 10B, ..., of appropriate intensity for the desired lighting or signaling function.
  • FIG 4 a schematic sectional view of a variant of the second embodiment which has just been described.
  • light sources 10A and 10B arranged on a crown 12, which can also be a flat ring or frustoconical, axis of revolution Oy. Only two sources have been shown for clarity of the drawing, the invention however applying to any number, greater than or equal to two, from light sources, distributed regularly on the crown or the ring 12 around the Oy axis.
  • the optical systems forming real images of the light sources 10A, 10B, ... are portions of ellipsoids 24, arranged in a corolla around the Oy axis, in such a way that their first foci coincide with sources 10A, 10B, ..., and that their second foci are confused with each other on the axis Oy and with the focus object of the reflecting surface R.
  • the secondary source S serves as the main source to give birth, for through the reflecting surface R, whose object focus coincides with the secondary source S, to a lighting or signaling beam, which can be rendered easily complies with a predetermined regulation by choosing sources 10A, 10B, ..., intensity appropriate to the desired lighting or signaling function.
  • a desired spatial distribution beam for example a cut-off beam, using a deflecting lens G, or a convex reflecting surface R produced in accordance to the teachings of documents FR-A-2 760 067 and FR-A-2 760 068 mentioned above.
  • the light sources 10A, 10B, ... are turned on. selectively, gradually or “all or nothing”, depending on the lighting function or signaling that one wishes to see present in the final beam.
  • Such a possibility is also open for the first embodiment shown in Figure 1. It suffices to move a light source, for example the source 10B, and / or the lens 14 associated therewith, and / or to modify the focal length of the lens 14, to modify its contribution in the final bundle. Similarly, in the case of Figure 2, just move a light source, for example source 10B, and / or the portion ellipsoid 24 associated therewith, and / or to modify the focal distance or the eccentricity of the portion of ellipsoid 24, to modify the contribution of the source 10B in the final beam.
  • a lighting or signaling device has therefore been produced according to the present invention using multiple light sources to form a conforming light beam to predetermined regulations.
  • This beam being defined by a single system, namely the second optical system consisting of the converging lens or the reflecting surface, obtaining its spatial characteristics is very simple.
  • a lighting or signaling device is obtained particularly compact in its dimension parallel to the optical axis, i.e. thin.
  • the assembly of the sources and their positioning in relation to the other elements of the lighting or signaling device contributing to forming this light beam can be to do in a simple and reliable way, the sources being fixed on a support comprising a part in a frustoconical crown or a flat ring, a part serving to support the first systems optical elements forming real images of these light sources, and a part serving as support for the second optical system forming a bundle of these real images lighting or signaling.
  • a lighting or signaling device thus designed is inexpensive to build, assemble and maintain.
  • the present invention is not limited to the embodiments which have have been described, but those skilled in the art may on the contrary make numerous modifications to it that fall within its framework.
  • the light sources used may be incandescent lamps, halogen lamps, discharge lamps, light-emitting diodes, or the ends of optical fibers or light guides, the light sources used to constitute a single lighting or lighting device signaling according to the present invention which can be of different types, for example in the second embodiment, a discharge lamp may be used to produce a beam and a halogen lamp to make a driving beam.

Abstract

Luminous sources (10A,10B) supported on a crown (12) emit light which after passing through first optical systems (14) produces superimposed real images (11A,11B). The real images constitute a secondary light source (S) which is used with a secondary convex lens optical system (L) to produce a lighting or signalling beam. The beam may be easily modified as required by a Fresnel glass (G) or a mask

Description

La présente invention concerne les dispositifs d'éclairage ou de signalisation, destinés notamment mais non exclusivement aux véhicules automobiles. De tels dispositifs comportent classiquement et schématiquement une source lumineuse émettant des rayons lumineux qui sont recueillis par un miroir réflecteur qui les réfléchit en direction d'une glace de fermeture et de protection du dispositif d'éclairage ou de signalisation pour former un faisceau lumineux d'éclairage ou de signalisation.The present invention relates to lighting or signaling devices, intended in particular but not exclusively to motor vehicles. Such devices include conventionally and schematically a light source emitting light rays which are collected by a reflecting mirror which reflects them towards a closing window and for protecting the lighting or signaling device to form a light beam lighting or signaling.

En juxtaposant plusieurs de ces dispositifs, on peut ainsi classiquement fournir différents faisceaux lumineux respectant chacun diverses réglementations, concernant leur photométrie et leur répartition spatiale.By juxtaposing several of these devices, it is thus conventionally possible to provide different light beams, each respecting various regulations, concerning their photometry and their spatial distribution.

Les sources lumineuses utilisées peuvent être constituées de lampes à incandescence, de lampes halogènes ou de lampes à décharge, ces différentes lampes pouvant coexister dans un projecteur ou un feu, chaque lampe étant destinée à remplir une fonction, c'est à dire à former la source lumineuse à l'origine d'un faisceau possédant une photométrie et une géométrie réglementaires prédéterminées.The light sources used may consist of incandescent lamps, halogen lamps or discharge lamps, these different lamps being able to coexist in a spotlight or a fire, each lamp being intended to fulfill a function, that is to say forming the light source at the origin of a beam having a photometry and a geometry predetermined regulations.

Il peut être souhaitable d'utiliser plusieurs sources lumineuses pour remplir une même fonction, soit pour obtenir un faisceau plus intense en utilisant plusieurs des sources lumineuses citées ci-dessus, soit pour obtenir un faisceau d'intensité égale à celle d'un faisceau obtenu avec une seule de ces sources lumineuses, mais en utilisant plusieurs sources lumineuses moins puissantes.It may be desirable to use multiple light sources to fill a single function, i.e. to obtain a more intense beam by using several of the light sources cited above, either to obtain a beam of intensity equal to that of a beam obtained with only one of these light sources, but using multiple light sources less powerful.

Le problème que pose alors l'utilisation simultanée de plusieurs sources lumineuses pour former un faisceau réside dans le fait que les contributions individuelles de chaque source doivent s'additionner exactement pour former un faisceau résultant dont la photométrie soit conforme à la réglementation en vigueur.The problem then posed by the simultaneous use of several light sources to form a beam lies in the fact that the individual contributions of each source must be added exactly to form a resulting beam whose photometry complies with the regulations in force.

Pour former par exemple un faisceau lumineux global comportant une coupure réglementaire, comme un faisceau lumineux de croisement ou un faisceau lumineux antibrouillard, il est nécessaire d'une part que chaque faisceau lumineux élémentaire, c'est à dire engendré par une seule source lumineuse, comporte une telle coupure, et d'autre part que toutes les coupures élémentaires se superposent exactement pour constituer la coupure du faisceau lumineux global, qui autrement serait floue, et donc non conforme à la réglementation.To form, for example, a global light beam comprising a regulatory cut-off, like a passing light beam or an anti-fog light beam, it is necessary on the one hand that each elementary light beam, that is to say generated by a single light source, includes such a cut, and on the other hand that all elementary cuts exactly overlap to constitute the cut of the light beam global, which would otherwise be unclear, and therefore not in compliance with the regulations.

On connaít par exemple par le document US-A-5 084 804 un dispositif, comportant plusieurs sources lumineuses constituées par des diodes électroluminescentes connectées en série et situées chacune au foyer objet d'un réflecteur parabolique. Un tel dispositif peut fournir un faisceau de signalisation, mais pas un faisceau d'éclairage.We know for example from document US-A-5 084 804 a device, comprising several light sources constituted by light-emitting diodes connected in series and each located at the focus of a parabolic reflector. Such a device can provide a signaling beam, but not a lighting beam.

On connaít également du document WO-97/48 134 un dispositif comportant des diodes électroluminescentes montées sur un support commun, les diodes émettant des faisceaux lumineux de couleurs complémentaires, par exemple ambre et vert-bleu, de manière que la superposition de ce faisceaux produise un faisceau résultant de couleur blanche. Une glace colorée peut être disposée pour conférer une couleur particulière au faisceau émergeant du dispositif, qui là encore peut fournir un faisceau de signalisation, mais pas un faisceau d'éclairage.Also known from document WO-97/48 134 is a device comprising diodes light emitting devices mounted on a common support, the diodes emitting beams bright in complementary colors, for example amber and green-blue, so that the superimposition of these beams produces a resulting beam of white color. An ice cream colored can be arranged to give a particular color to the beam emerging from the device, which again can provide a signaling beam, but not a beam lighting.

On connaít encore du document EP-A-0 158 330 un dispositif d'éclairage comportant plusieurs modules identiques alignés, chaque module comprenant une source lumineuse et un réflecteur. Un glace commune est disposée devant tous les modules, de manière à assurer la répartition spatiale du faisceau résultant de la superposition des faisceaux créés par chaque module, de manière à obtenir par exemple un faisceau de route ou un faisceau de croisement. Les modules individuels doivent alors être positionnés les uns par rapport aux autres et par rapport à la glace avec une extrême précision pour obtenir par exemple un faisceau de croisement à coupure nette.Document EP-A-0 158 330 also discloses a lighting device comprising several identical modules aligned, each module comprising a light source and a reflector. A common glass is placed in front of all the modules, so as to ensure the spatial distribution of the beam resulting from the superposition of the beams created by each module, so as to obtain for example a driving beam or a passing beam. The individual modules must then be positioned in relation to each other and by compared to ice with extreme precision to obtain for example a passing beam with clear cut.

On connaít enfin des documents EP-A-0 949 449 et EP-A-1 008 801 un dispositif d'éclairage comportant une source lumineuse unique, disposée au premier foyer commun à plusieurs portions d'ellipsoïdes disposés en corolle. Chaque ellipsoïde forme ainsi de cette source unique une image en son deuxième foyer, un système optique associé à chaque image formant une partie du faisceau global résultant. Bien qu'utilisant une source lumineuse unique, les rayons lumineux issus de cette source sont partagés en un certain nombre de faisceaux élémentaires, convergeant vers plusieurs points sources secondaires, des lentilles convergentes formant de ces points sources secondaires des faisceaux différents se superposant pour constituer un faisceau de photométrie prédéterminée, par exemple un faisceau de croisement si on dispose aux points sources secondaires des caches appropriés. Dans ces conditions, les sources lumineuses, les réflecteurs, les caches et les lentilles doivent avoir des positions relatives parfaitement déterminées, d'où il en résulte une grande complexité de montage de ce dispositif d'éclairage, un coût élevé et un manque de fiabilité dû aux vibrations auxquelles il est soumis durant son utilisation sur un véhicule.We finally know from documents EP-A-0 949 449 and EP-A-1 008 801 a device of lighting comprising a single light source, disposed at the first focal point common to several portions of ellipsoids arranged in a corolla. Each ellipsoid thus forms of this single source an image in its second focus, an optical system associated with each image forming part of the resulting overall beam. Although using a single light source, the light rays coming from this source are divided into a certain number of beams elementary, converging towards several secondary source points, converging lenses forming from these secondary source points different beams superimposed to constitute a beam of predetermined photometry, for example a passing beam if one has appropriate caches at secondary source points. Under these conditions, the sources lights, reflectors, covers and lenses must have relative positions perfectly determined, resulting in a great complexity of mounting this device lighting, high cost and unreliability due to the vibrations at which it is submitted during use on a vehicle.

La présente invention se place dans ce contexte et elle a pour but de proposer un dispositif d'éclairage ou de signalisation utilisant plusieurs sources lumineuses pour former un faisceau lumineux conforme à une réglementation prédéterminée, l'assemblage des sources et leur positionnement par rapport aux autres éléments du dispositif d'éclairage ou de signalisation concourant à former ce faisceau lumineux se faisant de manière simple et fiable, le dispositif d'éclairage ou de signalisation ainsi conçu étant peu onéreux.The present invention is placed in this context and it aims to provide a device lighting or signaling using several light sources to form a light beam in accordance with predetermined regulations, the assembly of sources and their positioning in relation to the other elements of the lighting or signaling device helping to form this light beam being simple and reliable, the device lighting or signaling thus designed being inexpensive.

La présente invention a donc pour objet un dispositif d'éclairage ou de signalisation, comportant au moins deux sources lumineuses, chaque source lumineuse étant associée à un premier système optique.The present invention therefore relates to a lighting or signaling device, comprising at least two light sources, each light source being associated with a first optical system.

Selon la présente invention, chaque premier système optique forme à distance finie une image réelle de la source lumineuse, les images des sources lumineuses étant confondues en un lieu commun constituant une source secondaire, et un deuxième système optique ayant un axe optique passant par la source secondaire forme de cette source secondaire un faisceau d'éclairage ou de signalisation.According to the present invention, each first optical system forms a finite distance a real image of the light source, the images of the light sources being confused with a common place constituting a secondary source, and a second optical system having a optical axis passing through the secondary source forms a beam from this secondary source lighting or signaling.

Selon d'autres caractéristiques avantageuses et non limitatives de l'invention :

  • les premiers systèmes optiques sont constitués par des lentilles convergentes formant des sources lumineuses des images réelles confondues pour former la source secondaire ;
  • les premiers systèmes optiques sont constitués par des ellipsoïdes ayant chacun un foyer objet confondu avec les sources lumineuses, les foyers image des ellipsoïdes étant tous confondus pour former la source secondaire ;
  • le deuxième système optique est constitué par une lentille convergente, dont le foyer objet est confondu avec la source secondaire et formant le faisceau d'éclairage ou de signalisation ;
  • le deuxième système optique est constitué par une surface réfléchissante, possédant un foyer objet confondu avec la source secondaire et formant le faisceau d'éclairage ou de signalisation;
  • la surface réfléchissante est convexe ;
  • la surface réfléchissante convexe est une portion de paraboloïde ;
  • une glace déviatrice est disposée en aval du deuxième système optique pour conférer au faisceau lumineux émergeant du dispositif une répartition spatiale prédéterminée ;
  • la surface réfléchissante convexe comporte au moins une région apte à engendrer par elle même un faisceau d'éclairage ou de signalisation avec coupure;
  • un cache est disposé perpendiculairement à l'axe optique du deuxième système optique ;
  • le cache est mobile entre deux positions, une première position dans laquelle il intercepte une partie des rayons lumineux constituant la source secondaire et une deuxième position dans laquelle il laisse passer tous les rayons lumineux issus de la source secondaire ;
  • les sources lumineuses sont des diodes électroluminescentes ;
  • les sources lumineuses sont constituées par les extrémités de fibres optiques ou de guides de lumière ;
  • les sources lumineuses sont allumées sélectivement.
According to other advantageous and non-limiting characteristics of the invention:
  • the first optical systems are constituted by converging lenses forming light sources of the real images combined to form the secondary source;
  • the first optical systems are constituted by ellipsoids each having an object focus coincident with the light sources, the image focal points of the ellipsoids all being combined to form the secondary source;
  • the second optical system consists of a converging lens, the object focus of which coincides with the secondary source and forming the lighting or signaling beam;
  • the second optical system is constituted by a reflecting surface, having an object focus coincident with the secondary source and forming the lighting or signaling beam;
  • the reflecting surface is convex;
  • the convex reflecting surface is a portion of a dish;
  • a deflecting lens is arranged downstream of the second optical system to give the light beam emerging from the device a predetermined spatial distribution;
  • the convex reflecting surface comprises at least one region capable of generating by itself a lighting or signaling beam with cutoff;
  • a cover is arranged perpendicular to the optical axis of the second optical system;
  • the cover is movable between two positions, a first position in which it intercepts part of the light rays constituting the secondary source and a second position in which it lets through all the light rays coming from the secondary source;
  • the light sources are light-emitting diodes;
  • the light sources are formed by the ends of optical fibers or light guides;
  • the light sources are selectively switched on.

D'autres buts, caractéristiques et avantages de la présente invention ressortiront clairement de la description qui va maintenant être faite d'un exemple de réalisation donné à titre non limitatif en référence aux dessins annexés sur lesquels :

  • La Figure 1 représente une vue schématique en coupe d'un premier mode de réalisation de la présente invention ;
  • La Figure 2 représente une vue schématique en coupe d'une variante du premier mode de réalisation de la présente invention ;
  • La Figure 3 représente une vue schématique en coupe d'un deuxième mode de réalisation de la présente invention, et
  • La Figure 4 représente une vue schématique en coupe d'une variante du deuxième mode de réalisation de la présente invention.
Other objects, characteristics and advantages of the present invention will emerge clearly from the description which will now be made of an exemplary embodiment given without limitation with reference to the appended drawings in which:
  • Figure 1 shows a schematic sectional view of a first embodiment of the present invention;
  • Figure 2 shows a schematic sectional view of a variant of the first embodiment of the present invention;
  • FIG. 3 represents a schematic sectional view of a second embodiment of the present invention, and
  • Figure 4 shows a schematic sectional view of a variant of the second embodiment of the present invention.

Sur les différentes Figures, les éléments identiques ou jouant le même rôle sont affectés des mêmes signes de référence. In the different Figures, identical elements or playing the same role are affected of the same reference signs.

On a représenté sur la Figure 1 une vue en coupe schématique d'un premier mode de réalisation de la présente invention. On voit sur cette Figure des sources lumineuses 10A et 10B, disposées sur une couronne tronconique 12 d'axe de révolution Oy. Seulement deux sources ont été représentées pour la clarté du dessin, mais il est bien évident que la présente invention s'applique à un nombre quelconque, supérieur ou égal à deux, de sources lumineuses, réparties régulièrement sur la couronne 12 autour de l'axe Oy.There is shown in Figure 1 a schematic sectional view of a first mode of realization of the present invention. We see in this Figure light sources 10A and 10B, arranged on a frustoconical crown 12 of axis of revolution Oy. Only two sources have been shown for clarity of design, but it is obvious that this invention applies to any number, greater than or equal to two, of light sources, evenly distributed over the crown 12 around the axis Oy.

Des lentilles convergentes 14 sont disposées à distance des sources lumineuses 10A, 10B,..., de manière à recueillir les rayons lumineux émis par celles-ci et à en former des images réelles 11A, 11B,.... De préférence, les lentilles 14 sont toutes identiques, et elles peuvent être portées par un support communConvergent lenses 14 are arranged at a distance from the light sources 10A, 10B, ..., so as to collect the light rays emitted by them and to form images thereof 11A, 11B, .... Preferably, the lenses 14 are all identical, and they can be carried by a common support

Conformément à la présente invention, les images 11A, 11B, ..., sont confondues en un lieu commun S, de manière à ce que tous les rayons émis par les sources 10A, 10B, ..., et ayant traversé les lentilles 14, soient tous convergents en ce lieu commun S. Le lieu commun S constitue donc une source secondaire de rayons lumineux résultant de la superposition des images 11A, 11B,... des sources 10A, 10B,....According to the present invention, the images 11A, 11B, ..., are merged into a common place S, so that all the rays emitted by sources 10A, 10B, ..., and having passed through the lenses 14, all converge in this common place S. The common place S therefore constitutes a secondary source of light rays resulting from the superposition of images 11A, 11B, ... from sources 10A, 10B, ....

La source secondaire S peut alors servir de source principale pour donner naissance à un faisceau d'éclairage ou de signalisation. On peut alors disposer, à distance du lieu commun S, une lentille convergente L, de telle sorte que son foyer objet soit également confondu avec le lieu commun S. L'axe optique de la lentille L est avantageusement confondu avec l'axe Oy. La lentille L forme donc une image à l'infini du lieu commun S, ce qui fournit ainsi un faisceau d'éclairage ou de signalisation, qui peut être rendu facilement conforme à une réglementation prédéterminée en choisissant des sources 10A, 10B, ..., d'intensité appropriée à la fonction d'éclairage ou de signalisation désirée.The secondary source S can then serve as the main source to give birth to a lighting or signaling beam. We can then have, away from the common place S, a converging lens L, so that its object focus is also confused with the common place S. The optical axis of the lens L is advantageously coincident with the axis Oy. The lens L therefore forms an image at infinity of the commonplace S, which thus provides a beam lighting or signaling, which can be easily made to comply with regulations predetermined by choosing sources 10A, 10B, ..., of intensity appropriate to the lighting or signaling function desired.

La présente invention permet par exemple d'obtenir de façon particulièrement simple un faisceau lumineux avec une coupure nette, et ce malgré l'utilisation de plusieurs sources lumineuses. En effet, la lentille L forme un faisceau de rayons parallèles, ou sensiblement parallèles. On peut alors disposer en aval (dans le sens de progression des rayons lumineux) de la lentille L une glace G, représentée en traits tiretés sur la Figure 1, munie de stries ou d'éléments déviateurs tels que des prismes de Fresnel, pour obtenir de façon connue la répartition spatiale désirée pour les rayons émergeant de la glace G.The present invention makes it possible, for example, to obtain in a particularly simple manner a light beam with a clear cut, despite the use of several sources bright. Indeed, the lens L forms a beam of rays which are parallel, or substantially parallel. It is then possible to have downstream (in the direction of progression of the light rays) of lens L a lens G, shown in dashed lines in FIG. 1, provided with streaks or deflecting elements such as Fresnel prisms, to obtain the distribution in a known manner desired space for rays emerging from ice G.

Au lieu d'utiliser une glace déviatrice G, on peut prévoir avantageusement de disposer un cache C au voisinage immédiat du lieu commun S, perpendiculairement à l'axe optique Oy de la lentille L, pour intercepter les rayons lumineux dirigés vers la lentille L et qui en ressortiraient en étant situés du côté non désiré de cette coupure.Instead of using a deflecting glass G, it is advantageous to plan to have a cover C in the immediate vicinity of the common place S, perpendicular to the optical axis Oy of lens L, to intercept the light rays directed towards lens L and which would emerge from it by being located on the unwanted side of this cut.

Le cache C possède ainsi un bord, situé au voisinage immédiat du lieu commun S, et donc dans le plan focal de la lentille L. La lentille L forme donc à l'infini l'image du bord du cache C, qui constitue la coupure du faisceau lumineux émis par la lentille L. On pourra avantageusement prévoir de rendre le cache mobile, par exemple mobile en rotation autour d'un axe perpendiculaire à l'axe optique Oy, entre deux positions, une première position dans laquelle il intercepte une partie des rayons lumineux constituant la source secondaire pour obtenir un faisceau à coupure tel qu'un faisceau de croisement, et une deuxième position dans laquelle il laisse passer tous les rayons lumineux issus de la source secondaire, pour obtenir un faisceau sans coupure tel qu'un faisceau de route.The cover C thus has an edge, located in the immediate vicinity of the common place S, and therefore in the focal plane of the lens L. The lens L therefore forms at infinity the image of the edge of the cover C, which constitutes the cut-off of the light beam emitted by the lens L. We can advantageously plan to make the cover mobile, for example mobile in rotation around of an axis perpendicular to the optical axis Oy, between two positions, a first position in which it intercepts part of the light rays constituting the secondary source for obtain a cut-off beam such as a passing beam, and a second position in which it lets pass all the light rays coming from the secondary source, to obtain a uninterrupted beam such as a driving beam.

On pourra alors utiliser dans ce cas une glace G lisse ou faiblement déviatrice puis-qu'elle n'a plus de fonction de répartition spatiale du faisceau lumineux.We can then use in this case a smooth or slightly deflecting glass G since it no longer has a function of spatial distribution of the light beam.

On a représenté sur la Figure 2 une vue en coupe schématique d'une variante du premier mode de réalisation de la présente invention qui vient d'être décrit. On voit sur cette Figure des sources lumineuses 10A et 10B, disposées sur une couronne 12, qui dans cette variante peut être un anneau plat ou tronconique, d'axe de révolution Oy. Seulement deux sources ont été représentées pour la clarté du dessin, mais il est bien évident que la présente invention s'applique à un nombre quelconque, supérieur ou égal à deux, de sources lumineuses, réparties régulièrement sur la couronne ou l'anneau 12 autour de l'axe Oy.There is shown in Figure 2 a schematic sectional view of a variant of the first embodiment of the present invention which has just been described. We see in this Figure light sources 10A and 10B, arranged on a ring 12, which in this variant can be a flat or frustoconical ring, of axis of revolution Oy. Only two sources have been shown for clarity of the drawing, but it is obvious that the present invention applies to any number, greater than or equal to two, of light sources, evenly distributed over the crown or ring 12 around the axis Oy.

Selon cette variante, les systèmes optiques formant des images réelles des sources lumineuses 10A, 10B, ..., sont des portions d'ellipsoïdes 24, disposés en corolle autour de l'axe Oy, de telle manière que leurs premiers foyers coïncident avec les sources 10A, 10B,..., et que leurs deuxièmes foyers soient confondus entre eux sur l'axe Oy et avec le foyer objet de la lentille L.According to this variant, the optical systems forming real images of the light sources 10A, 10B, ..., are portions of ellipsoids 24, arranged in a corolla around the axis Oy, in such a way that their first foci coincide with sources 10A, 10B, ..., and that their second hearths are confused between them on the axis Oy and with the hearth object of the lens L.

Dans la présente description, le terme « ellipsoïde » doit être entendu comme désignant une surface globale est voisine de celle d'un ellipsoïde de révolution, c'est à dire une surface dont la section par un plan passant par les deux foyers est une portion d'ellipse ou s'approche d'une portion d'ellipse, mais dont l'excentricité peut varier d'un plan de section à un autre, la surface pouvant comprendre des zones d'étendues limitées dont la section s'éloigne de celle d'une portion d'ellipse.In the present description, the term "ellipsoid" should be understood as designating a global surface is close to that of an ellipsoid of revolution, i.e. a surface whose section through a plane passing through the two foci is a portion of an ellipse or approaches of a portion of ellipse, but whose eccentricity can vary from one section plane to another, the surface may include areas of limited extent, the section of which deviates from that a portion of an ellipse.

De la même manière que précédemment, les rayons lumineux issus des différentes sources 10A, 10B,..., sont tous convergents vers le lieu commun S, qui constitue encore une source secondaire de rayons lumineux résultant de la superposition des images 11A, 11B, ... des sources 10A, 10B, ....La source secondaire S sert de source principale pour donner naissance, par l'intermédiaire de la lentille L dont le foyer objet coïncide avec la source secondaire S, à un faisceau d'éclairage ou de signalisation, qui peut être rendu facilement conforme à une réglementation prédéterminée en choisissant des sources 10A, 10B, ..., d'intensité appropriée à la fonction d'éclairage ou de signalisation désirée.In the same way as before, the light rays coming from the different sources 10A, 10B, ..., all converge on the commonplace S, which still constitutes a secondary source of light rays resulting from the superposition of images 11A, 11B, ... sources 10A, 10B, .... The secondary source S serves as the main source to give birth, by the lens L whose object focus coincides with the secondary source S, to a lighting or signaling beam, which can be easily made to conform to a predetermined regulation by choosing sources 10A, 10B, ..., of appropriate intensity to the desired lighting or signaling function.

Comme dans le mode de réalisation représenté sur la Figure 1, on peut facilement obtenir un faisceau de répartition spatiale désirée, par exemple un faisceau à coupure, en utilisant une glace déviatrice G, ou un cache C, éventuellement mobile entre deux positions.As in the embodiment shown in Figure 1, one can easily obtain a desired spatial distribution beam, for example a cut-off beam, using a deflecting glass G, or a cover C, possibly movable between two positions.

On a représenté sur la Figure 3 une vue en coupe schématique d'un deuxième mode de réalisation de la présente invention. On voit sur cette Figure que les sources lumineuses 10A et 10B sont encore disposées sur une couronne tronconique 12 d'axe de révolution Oy. Comme dans le premier mode de réalisation, Seules deux sources ont été représentées pour la clarté du dessin, mais la présente invention s'applique à un nombre quelconque, supérieur ou égal à deux, de sources lumineuses, réparties régulièrement sur la couronne 12 autour de l'axe Oy.There is shown in Figure 3 a schematic sectional view of a second mode of realization of the present invention. We see in this Figure that the light sources 10A and 10B are still arranged on a frustoconical crown 12 of axis of revolution Oy. As in the first embodiment, only two sources have been represented for the clarity of the drawing, but the present invention applies to any number, greater or equal to two, from light sources, distributed regularly on the crown 12 around the axis Oy.

Comme dans le premier mode de réalisation, des lentilles convergentes 14 sont disposées à distance des sources lumineuses 10A, 10B, ..., de manière à en former des images réelles 11A, 11B,.... Les images 11A, 11B, ..., sont là encore confondues en un lieu commun S, de manière à ce que tous les rayons émis par les sources 10A, 10B, ..., et ayant traversé les lentilles 14, soient tous convergents en ce lieu commun S, qui constitue alors la source secondaire S de rayons lumineux résultant de la superposition des images 11A, 11B, ... des sources 10A, 10B, ... et qui peut alors servir de source principale pour donner naissance à un faisceau d'éclairage ou de signalisation.As in the first embodiment, converging lenses 14 are arranged away from light sources 10A, 10B, ..., so as to form real images thereof 11A, 11B, .... The images 11A, 11B, ..., are again confused in a common place S, so that all the rays emitted by sources 10A, 10B, ..., and having passed through lenses 14, all converge in this commonplace S, which then constitutes the secondary source S of light rays resulting from the superposition of images 11A, 11B, ... of sources 10A, 10B, ... and which can then be used as the main source to give birth to a lighting or signaling beam.

Dans ce mode de réalisation, le système optique utilisé pour former le faisceau d'éclairage ou de signalisation à partir de la source S est constitué d'une surface réfléchissante R. La surface réfléchissante R peut être constituée d'un réflecteur classique de projecteur d'éclairage ou de feu de signalisation, c'est à dire une surface concave, la source secondaire S jouant le rôle d'une lampe classique.In this embodiment, the optical system used to form the beam lighting or signaling from source S consists of a reflective surface A. The reflective surface R can consist of a conventional spotlight reflector lighting or signaling light, i.e. a concave surface, the secondary source S playing the role of a classic lamp.

Cependant, pour des raisons d'encombrement, il est avantageux d'utiliser une surface réfléchissante convexe, ainsi qu'on l'a représenté sur la Figure 3. La surface réfléchissante R peut alors être considérée comme la surface d'un paraboloïde de révolution. Ce paraboloïde de révolution est disposé de telle sorte que son axe optique soit confondu avec l'axe Oy de symétrie par rapport auquel sont disposées les sources lumineuses 10A, 10B,..., et que son foyer soit confondu avec la source secondaire S.However, for reasons of space, it is advantageous to use a surface convex reflective, as shown in Figure 3. The reflective surface R can then be considered as the surface of a paraboloid of revolution. This dish of revolution is arranged so that its optical axis coincides with the axis Oy of symmetry in relation to which the light sources 10A, 10B, etc. are arranged, and that its focus is confused with the secondary source S.

La surface réfléchissante R étant convexe, elle transforme la source secondaire S, formée d'images réelles des sources lumineuses 10A, 10B,..., en un objet virtuel, dont la surface réfléchissante R donne une image réelle, située à l'infini dans le cas d'un paraboloïde de révolution, ce qui fournit ainsi un faisceau d'éclairage ou de signalisation, qui peut être rendu facilement conforme à une réglementation prédéterminée en choisissant des sources 10A, 10B, ..., d'intensité appropriée à la fonction d'éclairage ou de signalisation désirée.The reflecting surface R being convex, it transforms the secondary source S, formed real images of light sources 10A, 10B, ..., into a virtual object, the surface of which reflective R gives a real image, located at infinity in the case of a paraboloid of revolution, which thus provides a lighting or signaling beam, which can be rendered easily complies with predetermined regulations by choosing 10A sources, 10B, ..., of appropriate intensity for the desired lighting or signaling function.

Selon ce mode de réalisation, il est également possible d'obtenir de façon particulièrement simple un faisceau lumineux avec une coupure nette, et ce malgré l'utilisation de plusieurs sources lumineuses. En effet, il suffit de disposer sur le parcours du faisceau en aval de la surface réfléchissante R une glace déviatrice G, pour obtenir la répartition spatiale désirée pour les rayons lumineux. According to this embodiment, it is also possible to obtain particularly simple a light beam with a clear cut, despite the use of several light sources. Indeed, it suffices to have on the beam path downstream of the reflecting surface R a deflecting glass G, to obtain the desired spatial distribution for light rays.

Au lieu de disposer une glace déviatrice G, on pourra avantageusement choisir de conformer la surface réfléchissante R pour qu'elle soit apte à engendrer par elle même un faisceau d'éclairage ou de signalisation avec coupure. Elle pourra par exemple être réalisée en tenant compte des enseignements des documents FR-A-2 760 067 et FR-A-2 760 068, tous deux au nom de la Demanderesse. On utilisera ainsi une surface réfléchissante R de forme convexe complémentaire de la forme concave décrite dans ces documents.Instead of having a deflecting glass G, it is advantageously possible to choose to conform the reflecting surface R so that it is capable of generating by itself a beam lighting or signaling with cut-off. It could for example be carried out in taking into account the lessons learned from documents FR-A-2 760 067 and FR-A-2 760 068, all two in the name of the Applicant. We will thus use a reflective surface R of shape convex complementary to the concave shape described in these documents.

On pourra alors utiliser dans ce cas une glace G lisse ou faiblement déviatrice puis-qu'elle n'a plus de fonction de répartition spatiale du faisceau lumineux.We can then use in this case a smooth or slightly deflecting glass G since it no longer has a function of spatial distribution of the light beam.

On a représenté sur la Figure 4 une vue en coupe schématique d'une variante du deuxième mode de réalisation qui vient d'être décrit. On voit sur cette Figure des sources lumineuses 10A et 10B, disposées sur une couronne 12, qui peut encore être un anneau plat ou tronconique, d'axe de révolution Oy. Seules deux sources ont été représentées pour la clarté du dessin, l'invention s'appliquant toutefois à un nombre quelconque, supérieur ou égal à deux, de sources lumineuses, réparties régulièrement sur la couronne ou l'anneau 12 autour de l'axe Oy.There is shown in Figure 4 a schematic sectional view of a variant of the second embodiment which has just been described. We see in this Figure light sources 10A and 10B, arranged on a crown 12, which can also be a flat ring or frustoconical, axis of revolution Oy. Only two sources have been shown for clarity of the drawing, the invention however applying to any number, greater than or equal to two, from light sources, distributed regularly on the crown or the ring 12 around the Oy axis.

Comme dans la variante du premier mode de réalisation, les systèmes optiques formant des images réelles des sources lumineuses 10A, 10B, ..., sont des portions d'ellipsoïdes 24, disposés en corolle autour de l'axe Oy, de telle manière que leurs premiers foyers coïncident avec les sources 10A, 10B, ..., et que leurs deuxièmes foyers soient confondus entre eux sur l'axe Oy et avec le foyer objet de la surface réfléchissante R.As in the variant of the first embodiment, the optical systems forming real images of the light sources 10A, 10B, ..., are portions of ellipsoids 24, arranged in a corolla around the Oy axis, in such a way that their first foci coincide with sources 10A, 10B, ..., and that their second foci are confused with each other on the axis Oy and with the focus object of the reflecting surface R.

De la même manière que précédemment, les rayons lumineux issus des différentes sources 10A, 10B, ..., sont tous convergents vers le lieu commun S, qui constitue encore une source secondaire de rayons lumineux résultant de la superposition des images 11A, 11B, ... des sources 10A, 10B, ....In the same way as before, the light rays coming from the different sources 10A, 10B, ..., all converge on the commonplace S, which still constitutes a secondary source of light rays resulting from the superposition of images 11A, 11B, ... sources 10A, 10B, ....

La source secondaire S sert de source principale pour donner naissance, par l'intermédiaire de la surface réfléchissante R, dont le foyer objet coïncide avec la source secondaire S, à un faisceau d'éclairage ou de signalisation, qui peut être rendu facilement conforme à une réglementation prédéterminée en choisissant des sources 10A, 10B, ..., d'intensité appropriée à la fonction d'éclairage ou de signalisation désirée.The secondary source S serves as the main source to give birth, for through the reflecting surface R, whose object focus coincides with the secondary source S, to a lighting or signaling beam, which can be rendered easily complies with a predetermined regulation by choosing sources 10A, 10B, ..., intensity appropriate to the desired lighting or signaling function.

Comme dans le mode de réalisation représenté sur la Figure 3, on peut facilement obtenir un faisceau de répartition spatiale désirée, par exemple un faisceau à coupure, en utilisant une glace déviatrice G, ou une surface réfléchissante convexe R réalisée conformément aux enseignements des documents FR-A-2 760 067 et FR-A-2 760 068 précités.As in the embodiment shown in Figure 3, one can easily obtain a desired spatial distribution beam, for example a cut-off beam, using a deflecting lens G, or a convex reflecting surface R produced in accordance to the teachings of documents FR-A-2 760 067 and FR-A-2 760 068 mentioned above.

Dans le deuxième mode de réalisation représenté sur la Figure 3 ou sa variante représentée sur la Figure 4, on remarque d'autre part qu'il est très facilement possible d'identifier dans le faisceau émergeant du dispositif les rayons lumineux qui proviennent d'une source lumineuse prédéterminée et ayant été réfléchis par une région prédéterminée de la surface réfléchissante R. Ainsi, dans le cas de l'utilisation de seulement deux sources lumineuses pour simplifier, les rayons lumineux émis par la source 10A sont tous compris dans la moitié gauche du faisceau des Figures 3 et 4, alors que les rayons lumineux émis par la source 10B sont tous compris dans la moitié droite du faisceau lumineux représenté sur ces Figures.In the second embodiment shown in Figure 3 or its variant shown in Figure 4, we note on the other hand that it is very easily possible to identify in the beam emerging from the device the light rays which come from a source predetermined light and having been reflected by a predetermined region of the reflecting surface A. Thus, in the case of using only two light sources for simplify, the light rays emitted by the 10A source are all included in the left half of the beam of Figures 3 and 4, while the light rays emitted by the source 10B are all included in the right half of the light beam shown in these Figures.

Il est ainsi possible d'affecter certaines sources lumineuses et/ou certaines régions de la surface réfléchissante R à des géométries particulières de faisceaux, à des intensités lumineuses particulières, ou même à des couleurs particulières. On pourra ainsi prévoir :

  • que certaines sources lumineuses émettent une couleur particulière, par exemple rouge ou ambre, pour fournir dans le faisceau une fonction de signalisation,
  • que certaines régions de la surface réfléchissante R associées à des sources prédéterminées soient paraboliques, pour fournir par exemple dans le faisceau une fonction éclairage de route, et/ou
  • que certaines régions de la surface réfléchissante R associées à des sources prédéterminées soient conformes aux enseignements des documents FR-A-2 760 067 et FR-A-2 760 068 précités, pour fournir par exemple dans le faisceau une fonction éclairage de croisement.
It is thus possible to assign certain light sources and / or certain regions of the reflecting surface R to particular geometries of beams, to particular light intensities, or even to particular colors. We can thus plan:
  • that certain light sources emit a particular color, for example red or amber, to provide a signaling function in the beam,
  • that certain regions of the reflecting surface R associated with predetermined sources are parabolic, to provide for example in the beam a road lighting function, and / or
  • that certain regions of the reflecting surface R associated with predetermined sources comply with the teachings of the documents FR-A-2 760 067 and FR-A-2 760 068 mentioned above, to provide for example in the beam a low beam function.

Selon une telle conception, les sources lumineuses 10A, 10B, ..., sont allumées de manière sélective, progressivement ou en « tout ou rien », selon la fonction d'éclairage ou de signalisation que l'on désire voir présente dans le faisceau final. According to such a design, the light sources 10A, 10B, ..., are turned on. selectively, gradually or “all or nothing”, depending on the lighting function or signaling that one wishes to see present in the final beam.

Une telle possibilité est également ouverte pour le premier mode de réalisation représenté sur la Figure 1. Il suffit en effet de déplacer une source lumineuse, par exemple la source 10B, et/ou la lentille 14 qui lui est associée, et/ou de modifier la distance focale de la lentille 14, pour modifier sa contribution dans le faisceau final. De même, dans le cas de la Figure 2, il suffit de déplacer une source lumineuse, par exemple la source 10B, et/ou la portion d'ellipsoïde 24 qui lui est associée, et/ou de modifier la distance focale ou l'excentricité de la portion d'ellipsoïde 24, pour modifier la contribution de la source 10B dans le faisceau final.Such a possibility is also open for the first embodiment shown in Figure 1. It suffices to move a light source, for example the source 10B, and / or the lens 14 associated therewith, and / or to modify the focal length of the lens 14, to modify its contribution in the final bundle. Similarly, in the case of Figure 2, just move a light source, for example source 10B, and / or the portion ellipsoid 24 associated therewith, and / or to modify the focal distance or the eccentricity of the portion of ellipsoid 24, to modify the contribution of the source 10B in the final beam.

Selon cette conception, il suffit alors d'allumer sélectivement les sources lumineuses 10A, 10B, ..., sélectivement ou en « tout ou rien », pour moduler leur contribution dans le faisceau final.According to this design, it is then sufficient to selectively switch on the light sources 10A, 10B, ..., selectively or "all or nothing", to modulate their contribution in the final beam.

On a donc bien réalisé selon la présente invention un dispositif d'éclairage ou de signalisation utilisant plusieurs sources lumineuses pour former un faisceau lumineux conforme à une réglementation prédéterminée. Ce faisceau étant défini par un système unique, à savoir le deuxième système optique constitué de la lentille convergente ou de la surface réfléchissante, l'obtention de ses caractéristiques spatiales se fait très simplement. D'autre part, et surtout avec le deuxième mode de réalisation, on obtient un dispositif d'éclairage ou de signalisation particulièrement compact dans sa dimension parallèle à l'axe optique, c'est à dire peu épais. L'assemblage des sources et leur positionnement par rapport aux autres éléments du dispositif d'éclairage ou de signalisation concourant à former ce faisceau lumineux peut se faire de manière simple et fiable, les sources étant fixées sur un support comportant une partie en couronne tronconique ou un anneau plat, une partie servant de support aux premiers systèmes optiques formant de ces sources lumineuses des images réelles, et une partie servant de support au deuxième système optique formant de ces images réelles confondues un faisceau d'éclairage ou de signalisation. Un dispositif d'éclairage ou de signalisation ainsi conçu est peu onéreux à construire, a assembler et à entretenir.A lighting or signaling device has therefore been produced according to the present invention using multiple light sources to form a conforming light beam to predetermined regulations. This beam being defined by a single system, namely the second optical system consisting of the converging lens or the reflecting surface, obtaining its spatial characteristics is very simple. On the other hand, and especially with the second embodiment, a lighting or signaling device is obtained particularly compact in its dimension parallel to the optical axis, i.e. thin. The assembly of the sources and their positioning in relation to the other elements of the lighting or signaling device contributing to forming this light beam can be to do in a simple and reliable way, the sources being fixed on a support comprising a part in a frustoconical crown or a flat ring, a part serving to support the first systems optical elements forming real images of these light sources, and a part serving as support for the second optical system forming a bundle of these real images lighting or signaling. A lighting or signaling device thus designed is inexpensive to build, assemble and maintain.

Bien entendu, la présente invention n'est pas limitée aux modes de réalisation qui ont été décrits, mais l'homme du métier pourra au contraire lui apporter de nombreuses modifications qui rentrent dans son cadre. C'est ainsi par exemple que les sources lumineuses utilisées peuvent être des lampes à incandescence, des lampes à halogène, des lampes à décharge, des diodes électroluminescentes, ou encore les extrémités de fibres optiques ou de guides de lumière, les sources lumineuses utilisées pour constituer un seul dispositif d'éclairage ou de signalisation selon la présente invention pouvant être de différents types, par exemple dans le deuxième mode de réalisation, on pourra utiliser une lampe à décharge pour réaliser un faisceau de croisement et une lampe à halogène pour réaliser un faisceau de route.Of course, the present invention is not limited to the embodiments which have have been described, but those skilled in the art may on the contrary make numerous modifications to it that fall within its framework. For example, the light sources used may be incandescent lamps, halogen lamps, discharge lamps, light-emitting diodes, or the ends of optical fibers or light guides, the light sources used to constitute a single lighting or lighting device signaling according to the present invention which can be of different types, for example in the second embodiment, a discharge lamp may be used to produce a beam and a halogen lamp to make a driving beam.

Claims (14)

Dispositif d'éclairage ou de signalisation, comportant au moins deux sources lumineuses (10A, 10B), chaque source lumineuse (10A, 10B) étant associée à un premier système optique (14, 24), caractérisé en ce que chaque premier système optique (14, 24) forme à distance finie une image réelle (11A, 11B) de la source lumineuse (10A, 10B), les images (11A, 11B) des sources lumineuses (10A, 10B) étant confondues en un lieu commun constituant une source secondaire (S), et en ce qu'un deuxième système optique (L, R) ayant un axe optique (Oy) passant par la source secondaire (S) forme de cette source secondaire (S) un faisceau d'éclairage ou de signalisation.Lighting or signaling device, comprising at least two light sources (10A, 10B), each light source (10A, 10B) being associated with a first optical system (14, 24), characterized in that each first optical system ( 14, 24) forms a real image (11A, 11B) of the light source (10A, 10B) at a finite distance, the images (11A, 11B) of the light sources (10A, 10B) being combined in a common place constituting a source secondary (S), and in that a second optical system (L, R) having an optical axis (Oy) passing through the secondary source (S) forms from this secondary source (S) a lighting or signaling beam . Dispositif selon la revendication 1, caractérisé en ce que les premiers systèmes optiques (14) sont constitués par des lentilles convergentes (14) formant des sources lumineuses (10A, 10B) des images réelles (11A, 11B) confondues pour former la source secondaire (S).Device according to claim 1, characterized in that the first optical systems (14) are constituted by converging lenses (14) forming light sources (10A, 10B) of the real images (11A, 11B) combined to form the secondary source ( S). Dispositif selon la revendication 1, caractérisé en ce que les premiers systèmes optiques (24) sont constitués par des ellipsoïdes (24) ayant chacun un foyer objet confondu avec les sources lumineuses (10A, 10B), les foyers image (11A, 11B) des ellipsoïdes étant tous confondus pour former la source secondaire (S).Device according to claim 1, characterized in that the first optical systems (24) consist of ellipsoids (24) each having an object focus coincident with the light sources (10A, 10B), the image focuses (11A, 11B) of the ellipsoids being all combined to form the secondary source (S). Dispositif selon la revendication 1, caractérisé en ce que le deuxième système optique (L) est constitué par une lentille convergente (L), dont le foyer objet est confondu avec la source secondaire (S) et formant le faisceau d'éclairage ou de signalisation.Device according to Claim 1, characterized in that the second optical system (L) consists of a converging lens (L), the object focus of which coincides with the secondary source (S) and forming the lighting or signaling beam . Dispositif selon la revendication 1, caractérisé en ce que le deuxième système optique (R) est constitué par une surface réfléchissante (R), possédant un foyer objet confondu avec la source secondaire (S) et formant le faisceau d'éclairage ou de signalisation.Device according to claim 1, characterized in that the second optical system (R) consists of a reflecting surface (R), having an object focus coincident with the secondary source (S) and forming the lighting or signaling beam. Dispositif selon la revendication 5, caractérisé en ce que la surface réfléchissante (R) est convexe.Device according to claim 5, characterized in that the reflecting surface (R) is convex. Dispositif selon la revendication 6, caractérisé en ce que la surface réfléchissante convexe (R) est une portion de paraboloïde. Device according to claim 6, characterized in that the convex reflecting surface (R) is a portion of paraboloid. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une glace déviatrice (G) est disposée en aval du deuxième système optique (L, R) pour conférer au faisceau lumineux émergeant du dispositif une répartition spatiale prédéterminée.Device according to any one of the preceding claims, characterized in that a deflecting glass (G) is arranged downstream of the second optical system (L, R) to give the light beam emerging from the device a predetermined spatial distribution. Dispositif selon la revendication 6, caractérisé en ce que la surface réfléchissante convexe (R) comporte au moins une région apte à engendrer par elle même un faisceau d'éclairage ou de signalisation avec coupure.Device according to claim 6, characterized in that the convex reflecting surface (R) comprises at least one region capable of generating by itself a lighting or signaling beam with cut-off. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'un cache (C) est disposé perpendiculairement à l'axe optique du deuxième système optique (L).Device according to any one of Claims 1 to 7, characterized in that a cover (C) is arranged perpendicular to the optical axis of the second optical system (L). Dispositif selon la revendication 9, caractérisé en ce que le cache (C) est mobile entre deux positions, une première position dans laquelle il intercepte une partie des rayons lumineux constituant la source secondaire (S) et une deuxième position dans laquelle il laisse passer tous les rayons lumineux issus de la source secondaire (S).Device according to claim 9, characterized in that the cover (C) is movable between two positions, a first position in which it intercepts part of the light rays constituting the secondary source (S) and a second position in which it lets all light rays from the secondary source (S). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les sources lumineuses (10A, 10B) sont des diodes électroluminescentes.Device according to any one of the preceding claims, characterized in that the light sources (10A, 10B) are light-emitting diodes. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que les sources lumineuses (10A, 10B) sont constituées par les extrémités de fibres optiques ou de guides de lumière.Device according to any one of Claims 1 to 10, characterized in that the light sources (10A, 10B) are formed by the ends of optical fibers or light guides. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que les sources lumineuses (10A, 10B) sont allumées sélectivement.Device according to any one of the preceding claims, characterized in that the light sources (10A, 10B) are selectively switched on.
EP02291426A 2001-06-14 2002-06-07 Lighting or signalling device Withdrawn EP1267116A1 (en)

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FR0107998A FR2826098B1 (en) 2001-06-14 2001-06-14 LIGHTING OR SIGNALING DEVICE, PARTICULARLY FOR VEHICLE, COMPRISING SEVERAL LIGHT SOURCES
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FR2826098B1 (en) 2003-12-26
FR2826098A1 (en) 2002-12-20
US6830359B2 (en) 2004-12-14
US20020191395A1 (en) 2002-12-19
JP2003065805A (en) 2003-03-05

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