WO2010135845A1 - Device for lighting a surface, comprising at least one light source such as a light emitting diode - Google Patents

Device for lighting a surface, comprising at least one light source such as a light emitting diode Download PDF

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Publication number
WO2010135845A1
WO2010135845A1 PCT/CH2010/000131 CH2010000131W WO2010135845A1 WO 2010135845 A1 WO2010135845 A1 WO 2010135845A1 CH 2010000131 W CH2010000131 W CH 2010000131W WO 2010135845 A1 WO2010135845 A1 WO 2010135845A1
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WO
WIPO (PCT)
Prior art keywords
light source
light
illuminated
illumination
structuring
Prior art date
Application number
PCT/CH2010/000131
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French (fr)
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WO2010135845A4 (en
WO2010135845A9 (en
Inventor
Sébastien Leroy
Maurice Gainville
Laurent Derriere
Jean-Pierre Lauret
Original Assignee
Code Lighting Sa
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Publication date
Application filed by Code Lighting Sa filed Critical Code Lighting Sa
Publication of WO2010135845A1 publication Critical patent/WO2010135845A1/en
Publication of WO2010135845A9 publication Critical patent/WO2010135845A9/en
Publication of WO2010135845A4 publication Critical patent/WO2010135845A4/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/08Refractors for light sources producing an asymmetric light distribution
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING 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
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a lighting device for illuminating a determined surface, by means of at least one said extended light source, of the light-emitting diode (LED) type or of the organic light-emitting diode (OLED) type, said surface determined to be illuminated having a specific geometry and said light source having a geometric position defined with respect to said determined surface to be illuminated, this light source being associated with a specific optical structure of the illumination of said determined surface, said specific optical structuring comprising at least one optical lens for structuring the illumination of said determined surface, comprising an input surface of light rays emitted by said light source and an output surface of said light rays having passed through said optical lens.
  • LED light-emitting diode
  • OLED organic light-emitting diode
  • the light sources are usually mounted on masts and radiate more or less symmetrically around this mast.
  • a majority of the light emitted is distributed in pure loss with respect to the desired objective, so that it is necessary to increase the overall power of the light source to be able to have a lighting of the surface to be illuminated, independently of the losses observed due to an uncontrollable spatial distribution of the light source outside this surface.
  • the actual consumption recorded is much higher than the theoretical consumption required to ensure proper illumination of the surface concerned.
  • the surface to be illuminated is often off-center with respect to the light source.
  • the surface to be illuminated is generally in the form of a long strip composed of juxtaposed substantially rectangular elementary surfaces each of which corresponds to a given light source, the complete strip being illuminated by a series of light sources spaced apart from each other .
  • Lighting systems are known to produce a certain asymmetric distribution of light.
  • the US publication US 2008/0239722 A1 and the international application WO 2008/000244 A2 present lighting means in a controlled manner.
  • light sources that are associated with optical systems do not generate both areas in which the light distribution is uniform and control the geometry of the light range.
  • the structure of the optical system associated with the source itself is fundamentally different from that of the device of the invention, so that the results obtained diverge notoriously.
  • the innovative solution proposed solves the problem of the homogeneous distribution of the illumination of a surface, in particular of a rectangular surface, from a so-called extended light source, of the light-emitting diode type or of the organic light-emitting diode type. , off-center, and has the advantage of ensuring a significant saving of energy consumed compared to traditional lighting.
  • the lighting device according to the invention is in fact an assembly composed of a light source and its associated optics, the light source possibly comprising one or more power LEDs.
  • the use of a single lighting device distributes the light flux over the entire surface to be illuminated. It shall be ensured that the mechanical structure on which the lighting device is mounted does not give rise to light pollution.
  • the lighting device as defined in the preamble, is characterized in that said input surface of the optical lens is configured so as to superpose the lighting zone of said a light source with said determined surface to be illuminated, said output surface of the optical lens being arranged to render the illumination uniform over the whole of said determined surface, and in that said surface of entry of the light rays of said optical lens of structuring the illumination of said determined surface comprises at least one reflecting zone arranged to return a portion of the light rays emitted by said light source and coming from the input surface of said optical lens, on at least a part of said surface determined to enlighten.
  • said output surface of the optical lens for structuring the illumination of said determined surface has an asymmetry plane arranged along a longitudinal axis passing through the light source and at least one plane of symmetry disposed along a transverse axis passing through the light source, said planes being oriented according to a given section of the surface to be illuminated.
  • said output surface of the optical lens for structuring the illumination of said determined surface has an asymmetry plane disposed along a longitudinal axis passing through the light source and at least one asymmetrical plane disposed along a transverse axis passing through the light source, said planes being oriented along a given section of the surface to be illuminated.
  • Said input surface of said optical lens for structuring the illumination of said determined surface advantageously integrates at least one convergent meniscus section of which one of the surfaces is reflective.
  • Said entrance surface preferably comprises at least one frosted beach whose function is to distribute a portion of the light rays emitted by the light source to obtain a spread of the luminous flux on the surface to be illuminated and to optimize the homogeneity of the level bright on the surface to be illuminated.
  • the device comprises a set of said extended light sources, of the light-emitting diode (LED) type or of the organic light-emitting diode (OLED) type, each of the light sources being individually associated with a structuring optics of FIG. lighting said determined surface.
  • LED light-emitting diode
  • OLED organic light-emitting diode
  • the device comprises a set of said extended light sources, of the light-emitting diode (LED) type, or of the organic light-emitting diode (OLED) type, this set of light sources being associated generally with an optical system. structuring the illumination of said determined surface.
  • LED light-emitting diode
  • OLED organic light-emitting diode
  • Said optical lens for structuring the illumination of said determined surface can be made by molding in a transparent material.
  • Said light source can be positioned in an interior space defined by the entrance surface of said optical lens for structuring the illumination of said determined surface.
  • the device may advantageously comprise a gas, a liquid, an optical gel or the like disposed between said light source and said optical lens for structuring the illumination of said surface, said gas, liquid, optical gel or the like having specific optical properties. to increase the optical performance of the lighting device.
  • FIG. 1A represents a surface to be illuminated and the distribution of the illumination of this surface with a first off-center light source as used in the device according to the invention
  • FIG. 1B represents a surface to be illuminated and the distribution of the illumination of this surface with a second off-center light source as used in the device according to the invention
  • FIG. 1C represents a surface to be illuminated and the distribution of the illumination of this surface with a third off-center light source as used in the device according to the invention
  • FIG. 2 represents a perspective view of a light source of the power LED type used to illuminate the surface of FIGS. 1A, 1B and 1C,
  • FIGS. 3A, 3B and 3C are views respectively in plan and in longitudinal and transverse section of a lighting device according to the invention.
  • FIGS. 4A, 4B are views respectively in longitudinal and transverse section with the trajectory of the light rays emitted by the light source on the input and output face of the lens of the device according to the invention
  • FIG. 5 is a schematic view illustrating the relative positioning of the lighting device and of a surface such as a road to be illuminated
  • Figs. 6A and 6B are views illustrating the longitudinal projection angles and lateral projection angles of the curb side and the road side
  • Figs. 7A and 7B are views which respectively show the distribution of light as obtained with illumination shown in Fig. 1A and with a succession of light sources identical to that used in Fig. 1A.
  • FIG. 1A is a diagrammatic plan view illustrating, the determined surface 10, which has for example a substantially rectangular shape, by means of a lighting device 11 comprising one or more LED extended light sources 20.
  • the surface 10 is divided into several sectors 10a, 10b, 10c, 10d which substantially correspond to rectangles inscribed in each other and which have decreasing dimensions. These rectangles are in fact lighting zones whose lighting is increasing when the dimensions are decreasing. Indeed, the inner area that corresponds to the rectangle 10a is the most illuminated.
  • the illumination of the surface 10 is symmetrical along a plane of symmetry D1 which passes through the center of the lighting device 11.
  • the perpendicular plane designated by D2 and passing through the center of the lighting device 11 divides the surface 10 into a light.
  • FIG. 1B is a schematic plan view similar to that of FIG. 1A, illustrating the determined surface 10, which has for example a substantially rectangular shape, by means of a lighting device 11 comprising one or more light sources, this lighting device having a different positioning from that of Figure 1A.
  • the surface 10 is decomposed as previously in several sectors 10a, 10b, 10c, 10d which substantially correspond to rectangles inscribed in each other and which have decreasing dimensions. These rectangles are in fact lighting zones whose lighting is increasing when the dimensions are decreasing. Indeed, the inner area that corresponds to the rectangle 10a is the most illuminated.
  • the illumination of the surface 10 is symmetrical with respect to a plane of symmetry D'2 disposed along a transverse axis passing through the center of the light source 20 and asymmetrical with respect to a perpendicular plane D'1 disposed along a longitudinal axis passing through by the center of the light source 20. This divides the surface 10 into a left main illuminated zone which is the largest and a right secondary illuminated zone of reduced extent.
  • FIG. 1C is a schematic plan view similar to that of FIG. 1B, illustrating the determined surface 10, which has for example a substantially rectangular shape, by means of a lighting device 11 comprising one or more light sources, this lighting device having a different positioning than that of Figure 1B.
  • the surface 10 is decomposed as previously in several sectors 10a, 10b, 10c, 10d which substantially correspond to rectangles inscribed in each other and which have decreasing dimensions. These rectangles are in fact lighting zones whose lighting is increasing when the dimensions are decreasing. Indeed, the inner area that corresponds to the rectangle 10a is the most illuminated.
  • the illumination of the surface 10 is asymmetrical with respect to a first plane of symmetry D "2 disposed along a transverse axis passing through the light source 20 and asymmetrical with respect to a perpendicular plane D" 1 disposed along a longitudinal axis passing through the light source.
  • the surface 10 is divided into a front and left main illuminated zone which is the most extensive and a rear and right secondary illuminated zone of reduced extent. An application of this distribution of light concerns for example the lighting of parking areas or the like, a courtyard, playgrounds and sports, station platforms, pedestrian crossings, etc.
  • This controlled distribution is achieved by means of the lighting device 11 so that it is possible to obtain homogeneous illumination, for example on an illuminated strip corresponding to the juxtaposition of surfaces 10, for example for the illumination of a road.
  • the zones 10b, 10c, and 10d with progressively decreasing illumination of a first surface 10 to be illuminated by means of a first illumination device 11 are superimposed on the areas with progressively increasing illumination 10d, 10c, and 10b of a second surface. 10 to illuminate, adjacent to said first surface to be illuminated, by means of a second lighting device 11.
  • a distribution will be illustrated by the view of Figure 7B.
  • the position of the lighting device is asymmetrical with respect to the illuminated surface. This asymmetry of the distribution of the light generated by the lighting device is obtained by a specific construction with a particular geometry of the essential components of the device, in this case the optical system associated with the light sources.
  • the lighting device 11 is composed of one or more light sources 20 and one or more specific optical structure 30 of the illumination of the surface to be illuminated consisting essentially of an optical lens 31.
  • the source 20, such as that represented by FIG. 2, mainly comprises an extended LED source 21, for example a LED of the CREE company, model XR or XP, mounted on a support, for example a printed circuit of the FR4 type, a reflector 22, a substrate 23 and a dome 26.
  • the reflector 22 consists of a metal or metal ring which surrounds the base of the dome 26, this ring being mounted on the substrate 23.
  • the substrate 23 consists of a plate carrying the source and the terminals for connection to an electrical power supply.
  • the structuring optics 30 is preferably positioned precisely on the LED and fixed on its support by screwing, gluing, clipping, welding or any other appropriate means.
  • the assembled assembly, in particular the structuring optics with its support, must be perfectly sealed and can protect the source of the ambient air and moisture. This seal may be obtained by the use of a waterproof glue, an O-ring or flat seal, an ultrasonic weld or by bi-injection of a seal directly on the structuring optics 30 or by encapsulation or an equivalent process.
  • Positioning feet 27 are preferably provided for positioning the optics 30 relative to the support, which advantageously comprises holes 28 for receiving these positioning feet, and thus to center the optics 30 with respect to the LED. Holes on the base of the optics 30 allow it to be held on the support by screws. In the case of clipping, the screw holes are replaced by clipping pins and, in the case of ultrasonic welding, lips will be provided on the periphery of the structuring optics 30.
  • This structuring optics 30 is configured to provide specific illumination as described above. It is preferably composed mainly of a lens 31 molded from a transparent thermoformable material and having an inlet surface 33, described below, whose shape and appearance are worked to obtain the desired results and an exit surface 36, also described below, which also presents a particular geometry adapted to the specifications in correlation with the geometry of the surface to be illuminated. Said outlet surface 36 may for example have a ring-like texture to further improve the homogeneity of the distribution on the specified surface.
  • FIGS. 3A and 3B show a view respectively in plan and in longitudinal section of the lighting device 11 with the light source 20 and the structuring optics 30.
  • the profile of the lens 31 and in particular the profile of its surface In this example, the inlet 33 and its outlet surface 36 have axial symmetry in one direction and asymmetry in the perpendicular direction. This characteristic makes it possible to obtain specific light distributions, particularly as shown in FIGS. 1A, 1B and 1C.
  • Fig. 3C is a cross-sectional view of the illuminator 11 shown in Fig. 3A.
  • the inner profile, ie the entrance surface 33 of the lens 31 is complex and incorporates a protuberance 34 in the form of at least one convergent meniscus section whose S2 surface is reflective. It can be metallized so as to increase their mirror effect and limit light loss.
  • FIGS. 4A and 4B illustrate the optical path of the light rays emitted by the light source 20 through optics 30 in the two directions, respectively longitudinal X and transverse Y of the beam.
  • the two radii R1d and R1g, on the one hand, and the two radii R2d and R2g, on the other hand, are respectively symmetrical with respect to an axis Z passing through the center O of the emitting light source. 20.
  • the radius R3 emitted by the source 20 enters the optics 30 by a convex input surface S1 at a point M, the refracted radius corresponding to this radius R3 is reflected at a point N of the reflecting surface S2 of the section converging meniscus 34 and spring of the optic 30 at a point P of the exit surface 36 of this optic 30.
  • the reflecting surface S2 being at total reflection, substantially all the light entering the converging meniscus section 34 is returned to the sector of the exit surface 36 which is located on one side of the line D2 (see FIG. 1A) passing through the center of the source 20 and perpendicular to the plane of symmetry D1. Note that this ray being deviated, the lighting it produces is shifted so as to approach the axis of the source.
  • the spokes R4, R5 and R6 penetrate into the optical structuring 30 by a convex surface S3, whose radius of curvature is gradually decreasing, and emerge from this optic 30 by the output surface 36 profiled for the light to be spread, substantially uniformly over the entire width of the illuminated rectangle, shown by way of example in Figure 1 A.
  • the entrance surface 33 of the optics 30 comprises at least one and preferably two frosted beaches Pa and Pb whose function is to disperse a portion of the radiation and spread it on the surface to be illuminated in the peripheral zones mentioned above in order to obtain an optimization of the distribution and homogeneity of the light over the entire surface specified.
  • the shapes and positions of these frosted beaches Pa and Pb are a function of the application and of said determined surface.
  • FIG. 5 represents a possible configuration with a light source 20 and its structuring optics 30, which is intended to illuminate a surface which corresponds mainly to a road traffic lane and in a minority to an adjoining sidewalk (FIG. 1A).
  • Line A1 corresponds to the perpendicular axis of the position of the lighting device 11 relative to the surface to be illuminated.
  • Line A2 corresponds to the possible angle of inclination of the optical axis of the lens relative to the lighting device 11.
  • lines A3 and A4 define the light beam as emitted by the lighting device 11.
  • the line A3 defines the curb side beam and the line A4 defines the beam side road.
  • the distance between the point B1 and the point B3 corresponds substantially to the width of the strip illuminated on the side of the sidewalk.
  • the distance between point B1 and point B4 corresponds substantially to the width of the illuminated strip on the road side.
  • This distribution of the lighting is obtained both by the arrangement, in particular the relative inclination of the lighting device 11, and in particular the lens relative to the surface to be illuminated, but above all thanks to the specific configuration of this lens.
  • the angle of inclination ⁇ of the lighting device 11 will be a function of the application. It should be 0 ° in most applications.
  • the sidewalk-lit strip is narrow and the illuminated strip on the road side is much wider.
  • This distribution of the lighting is obtained both by the arrangement and in particular the inclination of the lighting device 11, but especially by the specific configuration of the lens 31 and in particular its inner surface or entrance surface 33 light rays emitted by the source.
  • the lens 31 has the overall function of modifying the beam emitted by the light source 20, the initial characteristic of which is circular geometry, into a structured beam shifted laterally and spread in a substantially uniform manner over the entire illuminated surface.
  • FIGS. 6A and 6B show the longitudinal projection angles L (Lg and Ld) and the lateral projection angles T (sidewalk side) and R (road side), associated with a possible angle of inclination of the lighting device with respect to at the surface determined to be illuminated, these angles being a function of the application and of said determined surface.
  • Figure 7A shows a range illuminated by a lighting device 11 as shown in Figure 1A.
  • a lighting device 11 we find approximately the distribution light described with reference to this figure and in particular a central range 10a having a substantially uniform light distribution.
  • Fig. 7B shows a illuminated range 11 as shown in Fig. 1A and arranged along a straight line. It is found that the light distribution is substantially uniform in an approximately rectangular central region 10a.
  • the exemplary embodiment described essentially mentions a light source of the LED type associated with a single optic.
  • a single source is generally not sufficient and it is appropriate to group together a set of sources of the LED type and to associate each with a dedicated optics, or to associate with the set a single profiled optic of appropriate way.
  • the arrangement of different light sources is studied according to the geometry of the areas to be illuminated. The central surface of each area to be illuminated is approximately rectangular and the light distribution is substantially uniform.

Abstract

The invention relates to a lighting device (11) which resolves the problem of uniformly distributing light on a surface, in particular on a rectangular surface, from a so-called area light source, such as a light emitting diode (LED) or an off-centre organic light emitting diode (OLED). Said lighting device includes a light source (20) connected to a specific structuring optical unit (30) for lighting the predetermined surface. Said specific structuring optical unit (30) comprises an ophthalmic lens (31) for structuring the lighting of the predetermined surface (10), said lens comprising an input surface (33) for the light rays emitted by the light source (20) and an emitting surface (36) for the light rays that pass through the ophthalmic lens (31). The input surface (33) of the ophthalmic lens is configured such as to place the lighting area of the light source (20) vertically adjacent to the predetermined surface to be lighted, the emitting surface (36) of the ophthalmic lens being arranged such as to ensure the uniformity of the light across the entire predetermined surface.

Description

DISPOSITIF D'ECLAIRAGE D'UNE SURFACE, COMPORTANT AU MOINS UNE SOURCE LUMINEUSE DU TYPE A DIODE ELECTROLUMINESCENTE SURFACE LIGHTING DEVICE HAVING AT LEAST ONE LIGHT-EMITTING DIODE-LIKE SOURCE
Domaine technique La présente invention concerne un dispositif d'éclairage pour éclairer une surface déterminée, au moyen d'au moins une source lumineuse dite étendue, du type à diode électroluminescente (LED) ou du type à diode électroluminescente organique (OLED), ladite surface déterminée à éclairer ayant une géométrie spécifique et ladite source lumineuse ayant une position géométrique définie par rapport à ladite surface déterminée à éclairer, cette source lumineuse étant associée à une optique spécifique de structuration de l'éclairage de ladite surface déterminée, ladite optique spécifique de structuration comportant au moins une lentille optique de structuration de l'éclairage de ladite surface déterminée, comportant une surface d'entrée dés rayons lumineux émis par ladite source lumineuse et une surface de sortie desdits rayons lumineux ayant traversé ladite lentille optique.TECHNICAL FIELD The present invention relates to a lighting device for illuminating a determined surface, by means of at least one said extended light source, of the light-emitting diode (LED) type or of the organic light-emitting diode (OLED) type, said surface determined to be illuminated having a specific geometry and said light source having a geometric position defined with respect to said determined surface to be illuminated, this light source being associated with a specific optical structure of the illumination of said determined surface, said specific optical structuring comprising at least one optical lens for structuring the illumination of said determined surface, comprising an input surface of light rays emitted by said light source and an output surface of said light rays having passed through said optical lens.
Technique antérieurePrior art
La recherche de l'économie de la consommation d'énergie amène les fabricants de dispositifs d'éclairage, notamment dans le contexte de l'éclairage de grandes surfaces extérieures, telles que par exemple des zones d'éclairage public, ou des surfaces de zones d'activité qui doivent rester éclairées toute la nuit pour des raisons sécuritaires ou des raisons professionnelles, à concevoir des solutions plus économiques que les systèmes actuels. La plupart des dispositifs d'éclairage actuels comportent des sources lumineuses qui émettent un rayonnement lumineux à distribution sphérique, alors que le besoin se limite habituellement à l'éclairage d'une surface sensiblement plane au niveau du sol.The pursuit of the economy of energy consumption brings the manufacturers of lighting devices, in particular in the context of the lighting of large external surfaces, such as for example public lighting zones, or areas of zones. of activities that must stay informed all night for security reasons or professional reasons, to design solutions more economical than current systems. Most current lighting devices have light sources that emit spherical light radiation, whereas the need is usually limited to lighting a substantially flat surface at ground level.
En outre, les sources lumineuses sont habituellement montées sur des mâts et rayonnent plus ou moins symétriquement autour de ce mât. En conséquence, une partie majoritaire de la lumière émise est distribuée en pure perte par rapport à l'objectif recherché, de sorte qu'il est nécessaire d'augmenter la puissance globale de la source lumineuse pour pouvoir disposer d'un éclairage adéquat de la surface à éclairer, indépendamment des pertes constatées dues à une distribution spatiale incontrôlable de la source lumineuse en dehors de cette surface. De ce fait, la consommation effective enregistrée est très supérieure à la consommation théorique nécessaire pour assurer l'éclairage approprié de la surface concernée.In addition, the light sources are usually mounted on masts and radiate more or less symmetrically around this mast. As a result, a majority of the light emitted is distributed in pure loss with respect to the desired objective, so that it is necessary to increase the overall power of the light source to be able to have a lighting of the surface to be illuminated, independently of the losses observed due to an uncontrollable spatial distribution of the light source outside this surface. As a result, the actual consumption recorded is much higher than the theoretical consumption required to ensure proper illumination of the surface concerned.
Diverses solutions ont été proposées, telles que par exemple celle consistant à enfermer la source lumineuse dans un volume comportant une surface réfléchissante pour assurer une meilleure répartition de la lumière émise et un renvoi des faisceaux en direction de la surface à éclairer. Néanmoins, ces solutions qui sont devenues classiques ne répondent pas, de façon satisfaisante à cette recherche de solutions économiques. De nouvelles sources lumineuses qui répondent au besoin d'économie de la consommation sont apparues sur le marché. Il s'agit des sources lumineuses dites étendues, du type à diodes électroluminescentes, couramment appelées LED (light emitting diode). Utilisées individuellement ou montées de façon groupée; leur puissance d'émission est suffisante pour assurer un éclairage efficace sur des bases de consommation économiques. Toutefois, elles ont un diagramme d'intensité qui présente sensiblement une symétrie de révolution, de sorte qu'elles ne sont pas aptes à être utilisées directement pour éclairer de manière homogène une surface non circulaire, par exemple une surface rectangulaire, comme c'est le cas pour un éclairage public, par exemple une route, une cour, une zone de stockage etc.. En outre, pour un éclairage routier, la surface à éclairer est souvent décentrée par rapport à la source lumineuse. En effet, la surface à éclairer se présente généralement sous la forme d'une longue bande composée de surfaces élémentaires sensiblement rectangulaires juxtaposées dont chacune correspond à une source lumineuse donnée, la bande complète étant éclairée par une suite de sources lumineuses espacées les unes des autres. Une des contraintes imposées pour l'éclairage d'une telle bande de surfaces élémentaires sensiblement rectangulaires est que les rectangles juxtaposés ne se superposent pas afin que l'éclairage de toute la bande soit homogène et ne présente pas des zones sur-éclairées en raison de ia superposition locale de surfaces élémentaires adjacentes.Various solutions have been proposed, such as for example that of enclosing the light source in a volume having a reflective surface to ensure a better distribution of the emitted light and a return of the beams towards the surface to be illuminated. Nevertheless, these solutions that have become classic do not respond satisfactorily to this search for economic solutions. New light sources that meet the need for consumer economics have appeared on the market. These are so-called extended light sources, of the type with light-emitting diodes, commonly called LEDs (light emitting diode). Used individually or mounted in groups; their emitting power is sufficient to ensure efficient lighting on economic consumption bases. However, they have an intensity diagram which has substantially a symmetry of revolution, so that they are not suitable to be used directly to illuminate in a homogeneous manner a non-circular surface, for example a rectangular surface, as is the case for public lighting, for example a road, a yard, a storage area, etc. In addition, for road lighting, the surface to be illuminated is often off-center with respect to the light source. Indeed, the surface to be illuminated is generally in the form of a long strip composed of juxtaposed substantially rectangular elementary surfaces each of which corresponds to a given light source, the complete strip being illuminated by a series of light sources spaced apart from each other . One of the constraints imposed for the lighting of such a band of substantially rectangular elementary surfaces is that the juxtaposed rectangles are not superimposed so that the lighting of the entire strip is homogeneous and does not have over-illuminated areas due to the local overlapping of adjacent elementary surfaces.
On connaît des systèmes d'éclairage destinés à produire une certaine distribution asymétrique de la lumière. En particulier la publication américaine US 2008/0239722 A1 et la demande internationale WO 2008/000244 A2 présentent des moyens d'éclairage de manière contrôlée. Toutefois, les sources lumineuses qui sont associées à des systèmes optiques ne permettent pas de générer à la fois des zones dans lesquelles la distribution lumineuse est uniforme et de contrôler la géométrie de la plage lumineuse. La structure du système optique associé à la source proprement dite est fondamentalement différente de celle du dispositif de l'invention, de sorte que les résultats obtenus divergent notoirement.Lighting systems are known to produce a certain asymmetric distribution of light. In particular the US publication US 2008/0239722 A1 and the international application WO 2008/000244 A2 present lighting means in a controlled manner. However, light sources that are associated with optical systems do not generate both areas in which the light distribution is uniform and control the geometry of the light range. The structure of the optical system associated with the source itself is fundamentally different from that of the device of the invention, so that the results obtained diverge notoriously.
Exposé de l'inventionPresentation of the invention
La solution innovante proposée résout le problème de la répartition homogène de l'éclairage d'une surface, en particulier d'une surface rectangulaire, à partir d'une source lumineuse dite étendue, du type à diode électroluminescente ou du type à diode électroluminescente organique, décentrée, et présente l'avantage d'assurer une économie conséquente de l'énergie consommée par rapport aux éclairages traditionnels.The innovative solution proposed solves the problem of the homogeneous distribution of the illumination of a surface, in particular of a rectangular surface, from a so-called extended light source, of the light-emitting diode type or of the organic light-emitting diode type. , off-center, and has the advantage of ensuring a significant saving of energy consumed compared to traditional lighting.
Le dispositif d'éclairage selon l'invention est en fait un ensemble composé d'une source lumineuse et de son optique associée, la source lumineuse pouvant comporter une ou plusieurs LED de puissance. L'utilisation d'un seul dispositif d'éclairage permet de distribuer le flux lumineux sur toute la surface à éclairer. On veillera à ce que la structure mécanique sur laquelle est monté le dispositif d'éclairage n'engendre pas de pollution lumineuse.The lighting device according to the invention is in fact an assembly composed of a light source and its associated optics, the light source possibly comprising one or more power LEDs. The use of a single lighting device distributes the light flux over the entire surface to be illuminated. It shall be ensured that the mechanical structure on which the lighting device is mounted does not give rise to light pollution.
Pour atteindre ce but, le dispositif d'éclairage selon l'invention, tel que défini en préambule, est caractérisé en ce que ladite surface d'entrée de la lentille optique est configurée de manière à superposer la zone d'éclairage de ladite source lumineuse avec ladite surface déterminée à éclairer, ladite surface de sortie de la lentille optique étant agencée pour rendre homogène l'éclairage sur l'ensemble de ladite surface déterminée, et en ce que ladite surface d'entrée des rayons lumineux de ladite lentille optique de structuration de l'éclairage de ladite surface déterminée comporte au moins une zone réfléchissante agencée pour renvoyer une partie des rayons lumineux émis par ladite source lumineuse et issus de la surface d'entrée de ladite lentille optique, sur au moins une partie de ladite surface déterminée à éclairer.To achieve this goal, the lighting device according to the invention, as defined in the preamble, is characterized in that said input surface of the optical lens is configured so as to superpose the lighting zone of said a light source with said determined surface to be illuminated, said output surface of the optical lens being arranged to render the illumination uniform over the whole of said determined surface, and in that said surface of entry of the light rays of said optical lens of structuring the illumination of said determined surface comprises at least one reflecting zone arranged to return a portion of the light rays emitted by said light source and coming from the input surface of said optical lens, on at least a part of said surface determined to enlighten.
Selon une première forme de réalisation préférée dans laquelle ladite surface déterminée à éclairer est au moins partiellement décentrée par rapport à ladite source lumineuse, ladite surface de sortie de la lentille optique de structuration de l'éclairage de ladite surface déterminée présente un plan d'asymétrie disposé selon un axe longitudinal passant par la source lumineuse et au moins un plan de symétrie disposé selon un axe transversal passant par la source lumineuse, lesdits plans étant orientés selon une section déterminée de la surface à éclairer.According to a first preferred embodiment in which said determined area to be illuminated is at least partially off-center with respect to said light source, said output surface of the optical lens for structuring the illumination of said determined surface has an asymmetry plane arranged along a longitudinal axis passing through the light source and at least one plane of symmetry disposed along a transverse axis passing through the light source, said planes being oriented according to a given section of the surface to be illuminated.
Selon une seconde forme de réalisation préférée dans laquelle ladite surface déterminée à éclairer est au moins partiellement décentrée par rapport à ladite source lumineuse, ladite surface de sortie de la lentille optique de structuration de l'éclairage de ladite surface déterminée présente un plan d'asymétrie disposé selon un axe longitudinal passant par la source lumineuse et au moins un plan d'asymétrie disposé selon un axe transversal passant par la source lumineuse, lesdits plans étant orientés selon une section déterminée de la surface à éclairer.According to a second preferred embodiment in which said determined area to be illuminated is at least partially off-center with respect to said light source, said output surface of the optical lens for structuring the illumination of said determined surface has an asymmetry plane disposed along a longitudinal axis passing through the light source and at least one asymmetrical plane disposed along a transverse axis passing through the light source, said planes being oriented along a given section of the surface to be illuminated.
Ladite surface d'entrée de ladite lentille optique de structuration de l'éclairage de ladite surface déterminée intègre avantageusement au moins un tronçon de ménisque convergent dont une des surfaces est réfléchissante. Ladite surface d'entrée comporte de préférence au moins une plage dépolie qui a pour fonction de distribuer une partie des rayons lumineux émis par la source lumineuse pour obtenir un étalement du flux lumineux sur la surface à éclairer et d'optimiser l'homogénéité du niveau lumineux sur la surface à éclairer.Said input surface of said optical lens for structuring the illumination of said determined surface advantageously integrates at least one convergent meniscus section of which one of the surfaces is reflective. Said entrance surface preferably comprises at least one frosted beach whose function is to distribute a portion of the light rays emitted by the light source to obtain a spread of the luminous flux on the surface to be illuminated and to optimize the homogeneity of the level bright on the surface to be illuminated.
Selon un mode de réalisation particulier, le dispositif comporte un ensemble de sources lumineuses dites étendues, du type à diode électroluminescente (LED) ou du type à diode électroluminescente organique (OLED), chacune des sources lumineuses étant individuellement associée à une optique de structuration de l'éclairage de ladite surface déterminée.According to a particular embodiment, the device comprises a set of said extended light sources, of the light-emitting diode (LED) type or of the organic light-emitting diode (OLED) type, each of the light sources being individually associated with a structuring optics of FIG. lighting said determined surface.
Selon un autre mode de réalisation particulier, le dispositif comporte un ensemble de sources lumineuses dites étendues, du type à diode électroluminescente (LED), ou du type à diode électroluminescente organique (OLED), cet ensemble de sources lumineuses étant associé globalement à une optique de structuration de l'éclairage de ladite surface déterminée.According to another particular embodiment, the device comprises a set of said extended light sources, of the light-emitting diode (LED) type, or of the organic light-emitting diode (OLED) type, this set of light sources being associated generally with an optical system. structuring the illumination of said determined surface.
Ladite lentille optique de structuration de l'éclairage de ladite surface déterminée peut être réalisée par moulage en un matériau transparent.Said optical lens for structuring the illumination of said determined surface can be made by molding in a transparent material.
Ladite source lumineuse peut être positionnée dans un espace intérieur défini par la surface d'entrée de ladite lentille optique de structuration de l'éclairage de ladite surface déterminée.Said light source can be positioned in an interior space defined by the entrance surface of said optical lens for structuring the illumination of said determined surface.
Le dispositif peut avantageusement comporter un gaz, un liquide, un gel optique ou similaire disposé entre ladite source lumineuse et ladite lentille optique de structuration de l'éclairage de ladite surface, ledit gaz, liquide, gel optique ou similaire ayant des propriétés optiques spécifiques en vue d'augmenter les performances optiques du dispositif d'éclairage. Description sommaire des dessinsThe device may advantageously comprise a gas, a liquid, an optical gel or the like disposed between said light source and said optical lens for structuring the illumination of said surface, said gas, liquid, optical gel or the like having specific optical properties. to increase the optical performance of the lighting device. Brief description of the drawings
La présente invention et ses avantages apparaîtront mieux dans la description suivante d'un mode de réalisation donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels :The present invention and its advantages will appear better in the following description of an embodiment given by way of non-limiting example, with reference to the appended drawings in which:
la figure 1A représente une surface à éclairer et la répartition de l'éclairage de cette surface avec une première source de lumière décentrée telle qu'utilisée dans le dispositif selon l'invention,FIG. 1A represents a surface to be illuminated and the distribution of the illumination of this surface with a first off-center light source as used in the device according to the invention,
la figure 1B représente une surface à éclairer et la répartition de l'éclairage de cette surface avec une deuxième source de lumière décentrée telle qu'utilisée dans le dispositif selon l'invention,FIG. 1B represents a surface to be illuminated and the distribution of the illumination of this surface with a second off-center light source as used in the device according to the invention,
la figure 1C représente une surface à éclairer et la répartition de l'éclairage de cette surface avec une troisième source de lumière décentrée telle qu'utilisée dans le dispositif selon l'invention,FIG. 1C represents a surface to be illuminated and the distribution of the illumination of this surface with a third off-center light source as used in the device according to the invention,
la figure 2 représente une vue en perspective d'une source lumineuse du type LED de puissance utilisée pour effectuer l'éclairage de la surface des figure 1 A, 1B et 1C,FIG. 2 represents a perspective view of a light source of the power LED type used to illuminate the surface of FIGS. 1A, 1B and 1C,
les figures 3A, 3B et 3C sont des vues respectivement en plan et en coupe longitudinale et transversale d'un dispositif d'éclairage selon l'invention,FIGS. 3A, 3B and 3C are views respectively in plan and in longitudinal and transverse section of a lighting device according to the invention,
les figures 4A, 4B sont des vues respectivement en coupe longitudinale et transversale avec la trajectoire des rayons lumineux émis par la source lumineuse sur la face d'entrée et de sortie de la lentille du dispositif selon l'invention,FIGS. 4A, 4B are views respectively in longitudinal and transverse section with the trajectory of the light rays emitted by the light source on the input and output face of the lens of the device according to the invention,
la figure 5 est une vue schématique illustrant le positionnement relatif du dispositif d'éclairage et d'une surface telle qu'une route à éclairer, les figures 6A et 6B sont des vues qui illustrent les angles de projection longitudinaux et les angles de projection latéraux du côté trottoir et du côté route, etFIG. 5 is a schematic view illustrating the relative positioning of the lighting device and of a surface such as a road to be illuminated, Figs. 6A and 6B are views illustrating the longitudinal projection angles and lateral projection angles of the curb side and the road side, and
les figures 7A et 7B sont des vues qui représentent respectivement la répartition de la lumière telle qu'elle est obtenue avec un éclairage représenté par la figure 1A et avec une succession de sources de lumière identiques à celle qui est utilisée dans la figure 1 A.Figs. 7A and 7B are views which respectively show the distribution of light as obtained with illumination shown in Fig. 1A and with a succession of light sources identical to that used in Fig. 1A.
Meilleure manière de réaliser l'inventionBest way to realize the invention
La figure 1A est une vue schématique en plan illustrant, la surface déterminée 10, qui a par exemple une forme sensiblement rectangulaire, au moyen d'un dispositif d'éclairage 11 comportant une ou plusieurs sources lumineuses 20 dites étendues du type LED. La surface 10 se décompose en plusieurs secteurs 10a, 10b, 10c, 10d qui correspondent sensiblement à des rectangles inscrits les uns dans les autres et qui ont des dimensions décroissantes. Ces rectangles sont en fait des zones d'éclairage dont l'éclairage est croissant lorsque les dimensions sont décroissantes. En effet, la zone intérieure qui correspond au rectangle 10a est la plus éclairée. L'éclairage de la surface 10 est symétrique selon un plan de symétrie D1 qui passe par le centre du dispositif d'éclairage 11. Le plan perpendiculaire désigné par D2 et passant par le centre du dispositif d'éclairage 11 divise la surface 10 en une zone éclairée principale avant, qui est la plus large et une zone éclairée secondaire arrière de largeur réduite. Une telle répartition de la lumière est par exemple utile pour un éclairage routier où l'on souhaite limiter la diffusion de la lumière à une voie de circulation et en partie à un trottoir attenant, sachant qu'une installation équivalente est prévue de l'autre côté de la chaussée pour éclairer l'autre voie de circulation avec un trottoir attenant. L'application n'est pas limitée à cet exemple, mais peut s'étendre à de nombreuses utilisations, éventuellement avec des adaptations de cas en cas. La figure 1 B est une vue schématique en plan similaire à celle de la figure 1A, illustrant la surface déterminée 10, qui a par exemple une forme sensiblement rectangulaire, au moyen d'un dispositif d'éclairage 11 comportant une ou plusieurs sources lumineuses, ce dispositif d'éclairage ayant un positionnement différent de celui de la figure 1A. La surface 10 se décompose comme précédemment en plusieurs secteurs 10a, 10b, 10c, 10d qui correspondent sensiblement à des rectangles inscrits les uns dans les autres et qui ont des dimensions décroissantes. Ces rectangles sont en fait des zones d'éclairage dont l'éclairage est croissant lorsque les dimensions sont décroissantes. En effet, la zone intérieure qui correspond au rectangle 10a est la plus éclairée. L'éclairage de la surface 10 est symétrique par rapport à un plan de symétrie D'2 disposé selon un axe transversal passant par le centre de la source lumineuse 20 et asymétrique par rapport à un plan perpendiculaire D'1 disposé selon un axe longitudinal passant par le centre de la source lumineuse 20. Cela divise la surface 10 en une zone éclairée principale gauche qui est la plus étendue et une zone éclairée secondaire droite d'étendue réduite. Une utilisation avantageuse et bien adaptée à cette répartition concerne l'éclairage des tunnels. On notera que la "projection" de la lumière s'effectue dans un seul sens, ce qui permet par exemple d'éclairer un tunnel dans le sens de la circulation et évite, les automobilistes étant éclairés par l'arrière, un éblouissement par un éclairage de face.FIG. 1A is a diagrammatic plan view illustrating, the determined surface 10, which has for example a substantially rectangular shape, by means of a lighting device 11 comprising one or more LED extended light sources 20. The surface 10 is divided into several sectors 10a, 10b, 10c, 10d which substantially correspond to rectangles inscribed in each other and which have decreasing dimensions. These rectangles are in fact lighting zones whose lighting is increasing when the dimensions are decreasing. Indeed, the inner area that corresponds to the rectangle 10a is the most illuminated. The illumination of the surface 10 is symmetrical along a plane of symmetry D1 which passes through the center of the lighting device 11. The perpendicular plane designated by D2 and passing through the center of the lighting device 11 divides the surface 10 into a light. front main lighted area, which is the widest and a secondary back lit area of reduced width. Such a distribution of light is for example useful for road lighting where it is desired to limit the diffusion of light to a traffic lane and in part to an adjoining sidewalk, knowing that an equivalent installation is provided on the other side of the road to illuminate the other traffic lane with an adjoining sidewalk. The application is not limited to this example, but can be extended to many uses, possibly with case-by-case adaptations. FIG. 1B is a schematic plan view similar to that of FIG. 1A, illustrating the determined surface 10, which has for example a substantially rectangular shape, by means of a lighting device 11 comprising one or more light sources, this lighting device having a different positioning from that of Figure 1A. The surface 10 is decomposed as previously in several sectors 10a, 10b, 10c, 10d which substantially correspond to rectangles inscribed in each other and which have decreasing dimensions. These rectangles are in fact lighting zones whose lighting is increasing when the dimensions are decreasing. Indeed, the inner area that corresponds to the rectangle 10a is the most illuminated. The illumination of the surface 10 is symmetrical with respect to a plane of symmetry D'2 disposed along a transverse axis passing through the center of the light source 20 and asymmetrical with respect to a perpendicular plane D'1 disposed along a longitudinal axis passing through by the center of the light source 20. This divides the surface 10 into a left main illuminated zone which is the largest and a right secondary illuminated zone of reduced extent. An advantageous use and well adapted to this distribution concerns tunnel lighting. It should be noted that the "projection" of the light takes place in one direction only, which makes it possible for example to illuminate a tunnel in the direction of the traffic and avoids, the motorists being lighted by the rear, a dazzling by a front lighting.
La figure 1C est une vue schématique en plan similaire à celle de la figure 1B, illustrant la surface déterminée 10, qui a par exemple une forme sensiblement rectangulaire, au moyen d'un dispositif d'éclairage 11 comportant une ou plusieurs sources lumineuses, ce dispositif d'éclairage ayant un positionnement différent de celui de la figure 1B. La surface 10 se décompose comme précédemment en plusieurs secteurs 10a, 10b, 10c, 10d qui correspondent sensiblement à des rectangles inscrits les uns dans les autres et qui ont des dimensions décroissantes. Ces rectangles sont en fait des zones d'éclairage dont l'éclairage est croissant lorsque les dimensions sont décroissantes. En effet, la zone intérieure qui correspond au rectangle 10a est la plus éclairée. L'éclairage de la surface 10 est asymétrique par rapport à un premier plan de symétrie D"2 disposé selon un axe transversal passant par la source lumineuse 20 et asymétrique par rapport à un plan perpendiculaire D"1 disposé selon un axe longitudinal passant par la source lumineuse. La surface 10 est divisée en une zone éclairée principale avant et gauche qui est la plus étendue et une zone éclairée secondaire arrière et droite d'étendue réduite. Une application de cette répartition de la lumière concerne par exemple l'éclairage des aires de stationnement ou similaires, d'une cour intérieure, de terrains de jeu et de sport, de quais de gare, des passages pour piétons, etc.FIG. 1C is a schematic plan view similar to that of FIG. 1B, illustrating the determined surface 10, which has for example a substantially rectangular shape, by means of a lighting device 11 comprising one or more light sources, this lighting device having a different positioning than that of Figure 1B. The surface 10 is decomposed as previously in several sectors 10a, 10b, 10c, 10d which substantially correspond to rectangles inscribed in each other and which have decreasing dimensions. These rectangles are in fact lighting zones whose lighting is increasing when the dimensions are decreasing. Indeed, the inner area that corresponds to the rectangle 10a is the most illuminated. The illumination of the surface 10 is asymmetrical with respect to a first plane of symmetry D "2 disposed along a transverse axis passing through the light source 20 and asymmetrical with respect to a perpendicular plane D" 1 disposed along a longitudinal axis passing through the light source. The surface 10 is divided into a front and left main illuminated zone which is the most extensive and a rear and right secondary illuminated zone of reduced extent. An application of this distribution of light concerns for example the lighting of parking areas or the like, a courtyard, playgrounds and sports, station platforms, pedestrian crossings, etc.
Cette répartition contrôlée est réalisée au moyen du dispositif d'éclairage 11 afin que l'on puisse obtenir un éclairage homogène, par exemple sur une bande éclairée correspondant à la juxtaposition de surfaces 10, par exemple pour l'éclairage d'une route. Les zones 10b, 10c, et 10d à éclairage progressivement décroissant d'une première surface 10 à éclairer au moyen d'un premier dispositif d'éclairage 11 se superposent aux zones à éclairage progressivement croissant 10d, 10c, et 10b d'une deuxième surface à éclairer 10, adjacente à ladite première surface à éclairer, au moyen d'un deuxième dispositif d'éclairage 11. Une telle répartition sera illustrée par la vue de la figure 7B. Dans tous ces cas de figure, la position du dispositif d'éclairage est asymétrique par rapport à la surface éclairée. Cette asymétrie de la répartition de la lumière générée par le dispositif d'éclairage est obtenue par une construction spécifique avec une géométrie particulière des composants essentiels du dispositif, en l'occurrence du système optique associé aux sources lumineuses.This controlled distribution is achieved by means of the lighting device 11 so that it is possible to obtain homogeneous illumination, for example on an illuminated strip corresponding to the juxtaposition of surfaces 10, for example for the illumination of a road. The zones 10b, 10c, and 10d with progressively decreasing illumination of a first surface 10 to be illuminated by means of a first illumination device 11 are superimposed on the areas with progressively increasing illumination 10d, 10c, and 10b of a second surface. 10 to illuminate, adjacent to said first surface to be illuminated, by means of a second lighting device 11. Such a distribution will be illustrated by the view of Figure 7B. In all these cases, the position of the lighting device is asymmetrical with respect to the illuminated surface. This asymmetry of the distribution of the light generated by the lighting device is obtained by a specific construction with a particular geometry of the essential components of the device, in this case the optical system associated with the light sources.
Le dispositif d'éclairage 11 se compose d'une ou de plusieurs sources lumineuses 20 et d'une ou de plusieurs optiques spécifiques de structuration 30 de l'éclairage de la surface déterminée à éclairer constituées essentiellement d'une lentille optique 31. La source lumineuse 20, telle que celle représentée par la figure 2, comprend principalement une source étendue LED 21 , par exemple une LED de la société CREE, modèle XR ou XP, montée sur un support, par exemple un circuit imprimé du type FR4, un réflecteur 22, un substrat 23 et un dôme 26. Le réflecteur 22 est constitué d'une bague métallique ou métallisée qui entoure la base du dôme 26, cette bague étant montée sur le substrat 23. Le substrat 23 est constitué d'une platine portant la source et les bornes de raccordement à une alimentation en énergie électrique.The lighting device 11 is composed of one or more light sources 20 and one or more specific optical structure 30 of the illumination of the surface to be illuminated consisting essentially of an optical lens 31. The source 20, such as that represented by FIG. 2, mainly comprises an extended LED source 21, for example a LED of the CREE company, model XR or XP, mounted on a support, for example a printed circuit of the FR4 type, a reflector 22, a substrate 23 and a dome 26. The reflector 22 consists of a metal or metal ring which surrounds the base of the dome 26, this ring being mounted on the substrate 23. The substrate 23 consists of a plate carrying the source and the terminals for connection to an electrical power supply.
L'optique de structuration 30, est de préférence positionnée précisément sur la LED et fixée sur son support par vissage, collage, clipsage, soudage ou tout autre moyen approprié. L'ensemble assemblé, en particulier l'optique de structuration avec son support, doit être parfaitement étanche et permettre de protéger la source de l'air ambiant et de l'humidité. Cette étanchéité pourra être obtenue par l'utilisation d'une colle étanche, d'un joint torique ou plat, d'une soudure à ultrasons ou par bi-injection d'un joint directement sur l'optique de structuration 30 ou par encapsulage ou un procédé équivalent.The structuring optics 30 is preferably positioned precisely on the LED and fixed on its support by screwing, gluing, clipping, welding or any other appropriate means. The assembled assembly, in particular the structuring optics with its support, must be perfectly sealed and can protect the source of the ambient air and moisture. This seal may be obtained by the use of a waterproof glue, an O-ring or flat seal, an ultrasonic weld or by bi-injection of a seal directly on the structuring optics 30 or by encapsulation or an equivalent process.
Le positionnement de la LED est effectué de telle manière que le dôme 26 de la LED soit correctement positionné par rapport à l'optique de structuration 30 (sans contact). Des pieds de positionnement 27 sont de préférence prévus pour positionner l'optique 30 par rapport au support, qui comporte avantageusement des trous 28 en vue de recevoir ces pieds de positionnement, et de centrer ainsi l'optique 30 par rapport à la LED. Des trous sur la base de l'optique 30 permettent son maintien sur le support par des vis. Dans le cas de clipsage, les trous de vis sont remplacés par des pions de clipsage et, dans le cas d'une soudure par ultrasons, des lèvres seront prévues sur la périphérie de l'optique de structuration 30.The positioning of the LED is performed in such a way that the dome 26 of the LED is correctly positioned relative to the structuring optics 30 (without contact). Positioning feet 27 are preferably provided for positioning the optics 30 relative to the support, which advantageously comprises holes 28 for receiving these positioning feet, and thus to center the optics 30 with respect to the LED. Holes on the base of the optics 30 allow it to be held on the support by screws. In the case of clipping, the screw holes are replaced by clipping pins and, in the case of ultrasonic welding, lips will be provided on the periphery of the structuring optics 30.
Cette optique de structuration 30 est configurée de manière à réaliser un éclairage spécifique tel que décrit ci-dessus. Elle est de préférence constituée principalement d'une lentille 31 moulée en un matériau thermoformable transparent et comportant une surface d'entrée 33, décrite ci-dessous, dont la forme et l'aspect sont travaillés pour obtenir les résultats souhaités et une surface de sortie 36, décrite également ci-dessous, qui présente également une géométrie particulière adaptée au cahier des charges en corrélation avec la géométrie de la surface à éclairer. Ladite surface de sortie 36 peut par exemple présenter une texture du type annulaire pour améliorer davantage l'homogénéité de la distribution sur la surface spécifiée.This structuring optics 30 is configured to provide specific illumination as described above. It is preferably composed mainly of a lens 31 molded from a transparent thermoformable material and having an inlet surface 33, described below, whose shape and appearance are worked to obtain the desired results and an exit surface 36, also described below, which also presents a particular geometry adapted to the specifications in correlation with the geometry of the surface to be illuminated. Said outlet surface 36 may for example have a ring-like texture to further improve the homogeneity of the distribution on the specified surface.
Les figures 3A et 3B représentent une vue respectivement en plan et en coupe longitudinale du dispositif d'éclairage 11 avec la source lumineuse 20 et l'optique de structuration 30. On notera que le profil de la lentille 31 et notamment le profil de sa surface d'entrée 33 et de sa surface de sortie 36 présentent dans cet exemple une symétrie axiale dans une direction, et une asymétrie dans la direction perpendiculaire. Cette caractéristique permet d'obtenir des répartitions lumineuses spécifiques, notamment telles que le montrent les figures 1A, 1B et 1C.FIGS. 3A and 3B show a view respectively in plan and in longitudinal section of the lighting device 11 with the light source 20 and the structuring optics 30. It will be noted that the profile of the lens 31 and in particular the profile of its surface In this example, the inlet 33 and its outlet surface 36 have axial symmetry in one direction and asymmetry in the perpendicular direction. This characteristic makes it possible to obtain specific light distributions, particularly as shown in FIGS. 1A, 1B and 1C.
La figure 3C est une vue en coupe transversale du dispositif d'éclairage 11 représenté par la figure 3A. On notera, dans cet exemple, que le profil intérieur, c'est-à-dire la surface d'entrée 33 de la lentille 31 est complexe et intègre une protubérance 34 sous la forme d'au moins un tronçon de ménisque convergent dont la surface S2 est réfléchissante. Elle peut être métallisée de manière à augmenter leur effet miroir et limiter les pertes de lumière.Fig. 3C is a cross-sectional view of the illuminator 11 shown in Fig. 3A. In this example, it will be noted that the inner profile, ie the entrance surface 33 of the lens 31 is complex and incorporates a protuberance 34 in the form of at least one convergent meniscus section whose S2 surface is reflective. It can be metallized so as to increase their mirror effect and limit light loss.
Les figures 4A et 4B illustrent le trajet optique des rayons lumineux émis par la source lumineuse 20 à travers l'optique 30 dans les deux directions respectivement longitudinale X et transversale Y du faisceau. Dans l'exemple représenté, les deux rayons R1d et R1g, d'une part, et les deux rayons R2d et R2g, d'autre part, sont respectivement symétriques par rapport à un axe Z passant par le centre O de la source lumineuse émettrice 20. Le rayon R3 émis par la source 20 pénètre dans l'optique 30 par une surface convexe d'entrée S1 en un point M, le rayon réfracté correspondant à ce rayon R3 est réfléchi en un point N de la surface réfléchissante S2 du tronçon de ménisque convergent 34 et ressort de l'optique 30 en un point P de la surface de sortie 36 de cette optique 30. La surface réfléchissante S2 étant à réflexion totale, pratiquement toute la lumière qui pénètre dans le tronçon de ménisque convergent 34 est renvoyée vers le secteur de la surface de sortie 36 qui est localisée d'un côté de la ligne D2 (voir figure 1A) passant par le centre de la source 20 et perpendiculaire au plan de symétrie D1. On notera que ce rayon étant dévié, l'éclairage qu'il produit est décalé de manière à se rapprocher de l'axe de la source. Les rayons R4, R5 et R6 pénètrent dans l'optique de structuration 30 par une surface convexe S3, dont le rayon de courbure est progressivement décroissant, et ressortent de cette optique 30 par la surface de sortie 36 profilée pour que la lumière soit étalée, sensiblement uniformément sur toute la largeur du rectangle éclairé, représenté à titre d'exemple par la figure 1 A.FIGS. 4A and 4B illustrate the optical path of the light rays emitted by the light source 20 through optics 30 in the two directions, respectively longitudinal X and transverse Y of the beam. In the example shown, the two radii R1d and R1g, on the one hand, and the two radii R2d and R2g, on the other hand, are respectively symmetrical with respect to an axis Z passing through the center O of the emitting light source. 20. The radius R3 emitted by the source 20 enters the optics 30 by a convex input surface S1 at a point M, the refracted radius corresponding to this radius R3 is reflected at a point N of the reflecting surface S2 of the section converging meniscus 34 and spring of the optic 30 at a point P of the exit surface 36 of this optic 30. The reflecting surface S2 being at total reflection, substantially all the light entering the converging meniscus section 34 is returned to the sector of the exit surface 36 which is located on one side of the line D2 (see FIG. 1A) passing through the center of the source 20 and perpendicular to the plane of symmetry D1. Note that this ray being deviated, the lighting it produces is shifted so as to approach the axis of the source. The spokes R4, R5 and R6 penetrate into the optical structuring 30 by a convex surface S3, whose radius of curvature is gradually decreasing, and emerge from this optic 30 by the output surface 36 profiled for the light to be spread, substantially uniformly over the entire width of the illuminated rectangle, shown by way of example in Figure 1 A.
Les zones périphériques 10b, 10c et 10d (voir figure 1A) à éclairage progressivement décroissant se superposent à des zones périphériques similaires à éclairage progressivement croissant de telle manière que la somme des intensités lumineuses soit sensiblement constante. En outre, afin que les superpositions de zones ne soient pas critiques au point de créer des lignes ou des taches lumineuses suréclairées ou sombres, la surface d'entrée 33 de l'optique 30 comporte au moins une et de préférence deux plages dépolies Pa et Pb qui ont pour fonction de disperser une partie du rayonnement et de l'étaler sur la surface à éclairer dans les zones périphériques mentionnées ci- dessus afin d'obtenir une optimisation de la distribution et de l'homogénéité de la lumière sur toute la surface spécifiée. Les formes et les positions de ces plages dépolies Pa et Pb sont fonction de l'application et de ladite surface déterminée.The peripheral zones 10b, 10c and 10d (see FIG. 1A) with progressively decreasing illumination are superimposed on similar peripheral zones with gradually increasing illumination so that the sum of the light intensities is substantially constant. In addition, so that the overlays of zones are not critical to the point of creating lines or light spots that are over-lit or dark, the entrance surface 33 of the optics 30 comprises at least one and preferably two frosted beaches Pa and Pb whose function is to disperse a portion of the radiation and spread it on the surface to be illuminated in the peripheral zones mentioned above in order to obtain an optimization of the distribution and homogeneity of the light over the entire surface specified. The shapes and positions of these frosted beaches Pa and Pb are a function of the application and of said determined surface.
La figure 5 représente une configuration possible avec une source lumineuse 20 et son optique de structuration 30, qui est destinée à éclairer une surface qui correspond majoritairement à une voie de circulation routière et minoritairement à un trottoir attenant (figure 1A). La ligne A1 correspond à l'axe perpendiculaire de la position du dispositif d'éclairage 11 par rapport à la surface à éclairer. La ligne A2 correspond à l'angle d'inclinaison possible de l'axe optique de la lentille par rapport au dispositif d'éclairage 11. Les deux lignes A3 et A4 délimitent le faisceau lumineux tel qu'il est émis par le dispositif d'éclairage 11. La ligne A3 définit le faisceau du côté du trottoir et la ligne A4 définit le faisceau du côté route. La distance entre le point B1 et le point B3 correspond sensiblement à la largeur de la bande éclairée du côté du trottoir. La distance entre le point B1 et le point B4 correspond sensiblement à la largeur de la bande éclairée du côté de la route. Cette répartition de l'éclairage est obtenue à la fois par la disposition, notamment l'inclinaison relative du dispositif d'éclairage 11 , et en particulier de la lentille par rapport à la surface à éclairer, mais surtout grâce à la configuration spécifique de cette lentille. On notera que l'angle d'inclinaison α du dispositif d'éclairage 11 sera fonction de l'application. Il devrait être de 0° dans la majeure partie des applications.FIG. 5 represents a possible configuration with a light source 20 and its structuring optics 30, which is intended to illuminate a surface which corresponds mainly to a road traffic lane and in a minority to an adjoining sidewalk (FIG. 1A). Line A1 corresponds to the perpendicular axis of the position of the lighting device 11 relative to the surface to be illuminated. Line A2 corresponds to the possible angle of inclination of the optical axis of the lens relative to the lighting device 11. lines A3 and A4 define the light beam as emitted by the lighting device 11. The line A3 defines the curb side beam and the line A4 defines the beam side road. The distance between the point B1 and the point B3 corresponds substantially to the width of the strip illuminated on the side of the sidewalk. The distance between point B1 and point B4 corresponds substantially to the width of the illuminated strip on the road side. This distribution of the lighting is obtained both by the arrangement, in particular the relative inclination of the lighting device 11, and in particular the lens relative to the surface to be illuminated, but above all thanks to the specific configuration of this lens. It will be noted that the angle of inclination α of the lighting device 11 will be a function of the application. It should be 0 ° in most applications.
On constate que la bande éclairée du côté du trottoir est étroite et que la bande éclairée du côté route est nettement plus large. Cette répartition de l'éclairage est obtenue à la fois par la disposition et en particulier de l'inclinaison du dispositif d'éclairage 11 , mais surtout par la configuration spécifique de la lentille 31 et en particulier sa surface intérieure ou surface d'entrée 33 des rayons lumineux émis par la source. La lentille 31 a globalement comme fonction de modifier le faisceau émis par la source lumineuse 20, dont la caractéristique initiale est la géométrie circulaire, en un faisceau structuré décalé latéralement et étalé de manière sensiblement uniforme sur toute la surface éclairée.It can be seen that the sidewalk-lit strip is narrow and the illuminated strip on the road side is much wider. This distribution of the lighting is obtained both by the arrangement and in particular the inclination of the lighting device 11, but especially by the specific configuration of the lens 31 and in particular its inner surface or entrance surface 33 light rays emitted by the source. The lens 31 has the overall function of modifying the beam emitted by the light source 20, the initial characteristic of which is circular geometry, into a structured beam shifted laterally and spread in a substantially uniform manner over the entire illuminated surface.
Les figures 6A et 6B représentent les angles de projection longitudinaux L (Lg et Ld) et les angles de projection latéraux T (côté trottoir) et R (côté route), associés à un angle d'inclinaison possible du dispositif d'éclairage par rapport à la surface déterminée à éclairer, ces angles étant fonction de l'application et de ladite surface déterminée.FIGS. 6A and 6B show the longitudinal projection angles L (Lg and Ld) and the lateral projection angles T (sidewalk side) and R (road side), associated with a possible angle of inclination of the lighting device with respect to at the surface determined to be illuminated, these angles being a function of the application and of said determined surface.
La figure 7A représente une plage éclairée par un dispositif d'éclairage 11 tel que représenté par la figure 1A. On retrouve approximativement la distribution lumineuse décrite en référence à cette figure et notamment une plage centrale 10a ayant une distribution lumineuse sensiblement uniforme.Figure 7A shows a range illuminated by a lighting device 11 as shown in Figure 1A. We find approximately the distribution light described with reference to this figure and in particular a central range 10a having a substantially uniform light distribution.
La figure 7B représente une plage éclairée par dispositif d'éclairage 11 tels que représentés par la figure 1A et disposés le long d'une ligne droite. On constate que la distribution lumineuse est sensiblement uniforme dans une plage centrale 10a approximativement rectangulaire.Fig. 7B shows a illuminated range 11 as shown in Fig. 1A and arranged along a straight line. It is found that the light distribution is substantially uniform in an approximately rectangular central region 10a.
Il est bien évident que diverses modifications pourraient être apportées au dispositif en fonction de la forme géométrique de la surface à éclairer.It is obvious that various modifications could be made to the device depending on the geometric shape of the surface to be illuminated.
L'exemple de réalisation décrit mentionne essentiellement une source lumineuse du type LED associée à une optique unique. Pour l'éclairage public, une seule source n'est généralement pas suffisante et il convient de regrouper un ensemble de sources du type LED et de leur associer à chacune une optique dédiée, ou d'associer à l'ensemble une optique unique profilée de façon appropriée. La disposition de différentes sources lumineuses est étudiée en fonction de la géométrie des zones à éclairer. La surface centrale de chaque zone à éclairer est approximativement rectangulaire et la distribution lumineuse est sensiblement uniforme. The exemplary embodiment described essentially mentions a light source of the LED type associated with a single optic. For public lighting, a single source is generally not sufficient and it is appropriate to group together a set of sources of the LED type and to associate each with a dedicated optics, or to associate with the set a single profiled optic of appropriate way. The arrangement of different light sources is studied according to the geometry of the areas to be illuminated. The central surface of each area to be illuminated is approximately rectangular and the light distribution is substantially uniform.

Claims

REVENDICATIONS
1. Dispositif d'éclairage (11) pour éclairer une surface déterminée (10), au moyen d'au moins une source lumineuse (20) dite étendue, du type à diode électroluminescente (LED) ou du type à diode électroluminescente organique (OLED), ladite surface déterminée à éclairer ayant une géométrie spécifique et ladite source lumineuse ayant une position géométrique définie par rapport à ladite surface déterminée à éclairer, cette source lumineuse (20) étant associée à une optique spécifique de structuration (30) de l'éclairage de ladite surface déterminée, ladite optique spécifique de structuration (30) comportant au moins une lentille optique (31) de structuration de l'éclairage de ladite surface déterminée (10), comportant une surface d'entrée (33) des rayons lumineux émis par ladite source lumineuse (20) et une surface de sortie (36) desdits rayons lumineux ayant traversé ladite lentille optique (31), caractérisé en ce que ladite surface d'entrée (33) de la lentille optique est configurée de manière à superposer la zone d'éclairage de ladite source lumineuse (20) avec ladite surface déterminée (10) à éclairer, ladite surface de sortie (36) de la lentille optique (31) étant agencée pour rendre homogène l'éclairage sur l'ensemble de ladite surface déterminée (10), et en ce que ladite surface d'entrée (33) des rayons lumineux de ladite lentille optique (31) de structuration de l'éclairage de ladite surface déterminée comporte au moins une zone réfléchissante agencée pour renvoyer une partie des rayons lumineux émis par ladite source lumineuse (20) et issus de la surface d'entrée (33) de ladite lentille optique, sur au moins une partie de ladite surface déterminée (10) à éclairer.1. Illumination device (11) for illuminating a determined surface (10) by means of at least one light source (20) said extended, of the type of light emitting diode (LED) or the type of organic light-emitting diode (OLED ), said determined surface to be illuminated having a specific geometry and said light source having a geometric position defined with respect to said determined surface to be illuminated, this light source (20) being associated with a specific optical structuring (30) of the illumination of said determined surface, said specific optical structuring (30) comprising at least one optical lens (31) for structuring the illumination of said determined surface (10), comprising an input surface (33) of the light rays emitted by said light source (20) and an output surface (36) of said light rays having passed through said optical lens (31), characterized in that said input surface (33) of the optical lens is configured to superpose the illumination area of said light source (20) with said determined surface (10) to be illuminated, said output surface (36) of the optical lens (31) being arranged to render homogeneous illumination on all of said determined surface (10), and in that said input surface (33) of the light rays of said optical lens (31) for structuring the illumination of said determined surface comprises at least at least one reflecting zone arranged to return a portion of the light rays emitted by said light source (20) and coming from the input surface (33) of said optical lens, over at least a portion of said determined surface (10) to be illuminated .
2. Dispositif d'éclairage selon la revendication 1 , dans lequel ladite surface déterminée (10) à éclairer est au moins partiellement décentrée par rapport à ladite source lumineuse (20), caractérisé en ce que ladite surface de sortie (36) de la lentille optique (31) de structuration de l'éclairage de ladite surface déterminée présente un plan d'asymétrie (D'1) disposé selon un axe longitudinal passant par la source lumineuse (20) et au moins un plan de symétrie (D'2) disposé selon un axe transversal passant par la source lumineuse (20), lesdits plans (D'1, D'2) étant orientés selon une section déterminée de la surface à éclairer.2. Lighting device according to claim 1, wherein said determined surface (10) to be illuminated is at least partially off-center with respect to said light source (20), characterized in that said exit surface (36) of the lens optical (31) for structuring the illumination of said determined surface has an asymmetric plane (D'1) disposed along a longitudinal axis passing through the light source (20) and at least one plane of symmetry (D'2) disposed along a transverse axis passing through the light source (20), said planes (D'1, D'2) being oriented according to a given section of the surface to be illuminated.
3. Dispositif d'éclairage selon la revendication 1 , dans lequel ladite surface déterminée (10) à éclairer est au moins partiellement décentrée par rapport à ladite source lumineuse (20), caractérisé en ce que ladite surface de sortie (36) de la lentille optique (31) de structuration de l'éclairage de ladite surface déterminée présente un plan d'asymétrie3. Lighting device according to claim 1, wherein said determined area (10) to be illuminated is at least partially off-center with respect to said light source (20), characterized in that said exit surface (36) of the lens optical (31) structuring the illumination of said determined surface has an asymmetrical plane
(D"1) disposé selon un axe longitudinal passant par la source lumineuse (20) et au moins un plan d'asymétrie (D"2) disposé selon un axe transversal passant par la source lumineuse (20), lesdits plans (D"1 , D"2) étant orientés selon une section déterminée de la surface à éclairer.(D "1) disposed along a longitudinal axis passing through the light source (20) and at least one asymmetric plane (D" 2) disposed along a transverse axis passing through the light source (20), said planes (D "" 1, D "2) being oriented according to a given section of the surface to be illuminated.
4. Dispositif d'éclairage selon la revendication 1 , caractérisé en ce que ladite surface d'entrée (33) de ladite lentille optique (31) de structuration de l'éclairage de ladite surface déterminée intègre au moins un tronçon de ménisque convergent (34) dont une (S2) des surfaces est réfléchissante.4. Lighting device according to claim 1, characterized in that said input surface (33) of said optical lens (31) for structuring the illumination of said determined surface integrates at least one convergent meniscus section (34). ) of which one (S2) surfaces is reflective.
5. Dispositif d'éclairage selon la revendication 1 , caractérisé en ce que ladite surface d'entrée(33) comporte au moins une plage dépolie (Pa et/ou Pb) qui a pour fonction de distribuer une partie des rayons lumineux émis par la source lumineuse (20) pour obtenir un étalement du flux lumineux sur la surface à éclairer (10) et optimiser l'homogénéité du niveau lumineux sur ladite surface à éclairer.5. Lighting device according to claim 1, characterized in that said input surface (33) comprises at least one frosted area (Pa and / or Pb) whose function is to distribute a portion of the light rays emitted by the light source (20) for spreading the luminous flux over the surface to be illuminated (10) and optimizing the homogeneity of the luminous level on said surface to be illuminated.
6. Dispositif d'éclairage selon la revendication 1 , caractérisé en ce qu'il comporte un ensemble de sources lumineuses (20) dites étendues, du type à diode électroluminescente (LED) ou du type à diode électroluminescente organique (OLED), chacune des sources lumineuses étant individuellement associée à une optique de structuration (30) de l'éclairage de ladite surface déterminée (10).6. Lighting device according to claim 1, characterized in that it comprises a set of light sources (20) said extended, the type of light emitting diode (LED) or organic light-emitting diode type (OLED), each of light sources being individually associated with an optical structuring (30) of the illumination of said determined surface (10).
7. Dispositif d'éclairage selon la revendication 1 , caractérisé en ce qu'il comporte un ensemble de sources lumineuses (20) dites étendues, du type à diode électroluminescente (LED) ou du type à diode électroluminescente organique (OLED), cet ensemble de sources lumineuses étant associé globalement à une optique de structuration (30) de l'éclairage de ladite surface déterminée.7. Lighting device according to claim 1, characterized in that it comprises a set of light sources (20) said extended, of the type of light emitting diode (LED) or organic light-emitting diode (OLED), this set light sources being generally associated with an optical structuring (30) of the illumination of said determined surface.
8. Dispositif d'éclairage selon les revendications 1 , 6 et 7, caractérisé en ce que ladite optique de structuration (30) de l'éclairage de ladite surface déterminée (10) est réalisée par moulage en un matériau transparent.8. Lighting device according to claims 1, 6 and 7, characterized in that said optical structuring (30) of the illumination of said determined surface (10) is made by molding a transparent material.
9. Dispositif d'éclairage selon la revendication 1, caractérisé en ce que ladite source lumineuse (20) est positionnée dans un espace intérieur défini par la surface d'entrée (33) de ladite lentille optique (31) de structuration de l'éclairage de ladite surface déterminée.9. Lighting device according to claim 1, characterized in that said light source (20) is positioned in an interior space defined by the input surface (33) of said optical lens (31) structuring the lighting of said determined surface.
10. Dispositif d'éclairage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte un gaz, un liquide, un gel optique ou similaire disposé entre ladite source lumineuse (20) et ladite lentille optique (31) de structuration de l'éclairage de ladite surface, ledit gaz, liquide, gel optique ou similaire ayant des propriétés optiques spécifiques en vue d'augmenter les performances optiques du dispositif d'éclairage (11). 10. Lighting device according to any one of the preceding claims, characterized in that it comprises a gas, a liquid, an optical gel or the like disposed between said light source (20) and said optical lens (31) structuring illuminating said surface, said gas, liquid, optical gel or the like having specific optical properties to increase the optical performance of the lighting device (11).
PCT/CH2010/000131 2009-05-25 2010-05-20 Device for lighting a surface, comprising at least one light source such as a light emitting diode WO2010135845A1 (en)

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CH00804/09A CH701116A1 (en) 2009-05-25 2009-05-25 Device surface lighting, with at least one light source type emitting diode.

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