EP3467375A1 - Thin light-emitting device with homogeneous lighting - Google Patents

Thin light-emitting device with homogeneous lighting Download PDF

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Publication number
EP3467375A1
EP3467375A1 EP18193052.0A EP18193052A EP3467375A1 EP 3467375 A1 EP3467375 A1 EP 3467375A1 EP 18193052 A EP18193052 A EP 18193052A EP 3467375 A1 EP3467375 A1 EP 3467375A1
Authority
EP
European Patent Office
Prior art keywords
light
substrate
light sources
screen
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18193052.0A
Other languages
German (de)
French (fr)
Other versions
EP3467375B1 (en
Inventor
Natacha AUDY
Franck MILLON
Lingxuan Zhu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Publication of EP3467375A1 publication Critical patent/EP3467375A1/en
Application granted granted Critical
Publication of EP3467375B1 publication Critical patent/EP3467375B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • 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
    • 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]
    • 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
    • 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
    • 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
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/19—Attachment of light sources or lamp holders
    • F21S43/195—Details of lamp holders, terminals or connectors
    • 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
    • F21S43/37—Attachment 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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • 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
    • F21V7/0083—Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane
    • 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
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • 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 invention relates to the field of lighting and light signaling, in particular for a motor vehicle.
  • the published patent document FR 2 697 485 A1 discloses a signaling light comprising a plurality of light emitting diode (LED) type light sources arranged on a support and illuminating substantially perpendicular to the support towards a diffusion screen.
  • the traffic light includes a frame with orifices under which the LEDs are housed.
  • the latter are of the "Brewster" type, that is to say of an old type with mounting tabs on a printed circuit, said tabs extending axially under the body of the LEDs.
  • Such an arrangement requires a certain thickness which, in some applications, may not be available.
  • the LEDs illuminate directly towards the screen, which gives a pixelated or discreet appearance to the light image produced.
  • the published patent document US 2011/0051412 A1 relates to a display screen backlight unit, in particular of the liquid crystal or plasma type.
  • the backlight unit includes side-light emitting diode (LED) type light sources. These sources are arranged on a reflective substrate, the light emitted predominantly in the direction of the substrate is reflected by the reflecting surface of said substrate towards the rear face of the display screen, in view of its backlight.
  • LED side-light emitting diode
  • Such an arrangement is interesting in that it promotes the homogeneity of the backlight, avoiding the appearance of light spots at the light sources, especially when they illuminate directly to the display screen.
  • This arrangement also allows a reduction in thickness of the backlight unit.
  • the light output is low, essentially that a significant portion of the light produced propagates in the unit and fails to cross the screen.
  • the object of the invention is to propose a light device that overcomes at least one of the drawbacks of the above-mentioned state of the art. More particularly, the object of the invention is to propose a light device of thin construction and producing a homogeneous luminous image.
  • the subject of the invention is a light device, in particular for a motor vehicle, comprising: a substrate; light sources of the electroluminescence diode type with lateral illumination, arranged on the substrate and illuminating in principal directions oriented along the substrate; a screen arranged to receive the light rays emitted by the light sources; remarkable in that the substrate comprises openings and the light device further comprises reflective surfaces arranged in front of the openings so as to reflect towards the screen part of the light rays emitted by the light sources.
  • the screen is made of transparent or translucent material.
  • the screen is advantageously diffusing.
  • the substrate is made of electrically insulating material, such as type FR-4, and comprises one or more printed circuits configured to power the light sources.
  • each of the reflective surfaces is configured to reflect the portion of light rays substantially to the right of the corresponding aperture undergoing a divergent beam.
  • the reflecting surfaces are also diffusing.
  • the substrate comprises two opposite main faces, the screen being arranged vis-à-vis a first of said faces and the reflecting surfaces being arranged mainly opposite the second said faces.
  • each of the light sources is adjacent to one of the openings and illuminates substantially in the direction of said aperture.
  • At least two of the light sources are respectively associated with each of the openings,.
  • the substrate extends in a longitudinal direction, each of the openings comprising an edge extending transversely to said direction, the light source or sources adjacent to said aperture being disposed along said edge.
  • the edge of each of the openings is on a portion of the substrate forming a tongue.
  • the tongue thus formed is advantageous in that it discharges the zone of reception of the light source or sources of stresses related to the bending of the substrate when it has, in the mounted state, a curved profile.
  • each of the tongues is formed by two notches of the corresponding aperture, on either side of the corresponding edge.
  • the openings are arranged along the longitudinal direction and the substrate has a curved longitudinal profile.
  • the device comprises a support to which the substrate and the screen are fixed, said support comprising the reflecting surfaces.
  • This configuration is advantageous in more ways than one. It has, in addition to an economic advantage, an advantage of controlling the positioning tolerances of the reflective surfaces and a compactness advantage.
  • the support comprises projecting portions forming the reflecting surfaces and partially penetrating the openings.
  • the reflective surfaces are made by metallization of surfaces of the protruding portions.
  • the support is in one piece made of plastic material.
  • the substrate is fixed to the support, for example by screwing, clipping or snapping.
  • the screen is fixed to the support, for example by clipping and / or by screwing or welding.
  • each of the reflective surfaces comprises a first distal portion of the corresponding light source (s) and a second proximal portion of the at least one light source, the second portion having a mean inclination with respect to the aperture. stronger than a mean inclination of the first portion relative to said a journey.
  • each of the projecting portions has a projection between the first and second portions of the reflecting surface.
  • the fact of providing a projection is interesting in that it allows to choose which part of the cone of light emitted by the source will illuminate the first surface and which part will illuminate the second: the rays coming from the source do not have the same orientation depending on the fraction of the cone they come from, they also do not have the same energy level.
  • each of the first and second portions of each of the reflecting surfaces has a concave curved profile.
  • the device further comprises a light source control unit configured in such a way that at least two of said sources receive two different light intensity instructions. In this case, all the light sources are not lit with the same intensity, especially for a photometric purpose.
  • the device further comprises a light source control unit configured to gradually turn on the light sources step by step in a given direction so as to modulate a surface thus illuminated with the screen.
  • control unit is configured to also gradually turn off, step by step, the light sources located at one end of the illuminated surface which is opposite, in the given direction, the light sources on step by step, so as to move the illuminated surface of the screen.
  • the measurements of the invention are interesting in that they make it possible to produce a light device of small thickness with a great homogeneity of light in the light image produced. They also make it possible to produce a curved or curved luminous device, and this in an economical manner by means in particular of an initially flat substrate able to undergo a bending during its attachment to the support.
  • the production of a very homogeneous light image also has the advantage of being able to modulate the surface of the light image in a continuous and progressive manner. By such modulation, information can be expressed. he may be operating conditions of the vehicle, such as for example the fact that it accelerates or decelerates.
  • FIGS. 1 and 2 illustrate in perspective and exploded light device according to the invention.
  • the light device 2 consists essentially of a substrate 4 provided with openings 6, light sources 8 of the electroluminescence diode (LED) type disposed on the substrate 4, adjacent to the openings 6, a support 10 and a a screen 12 arranged vis-à-vis the substrate 4 and light sources 8.
  • LED electroluminescence diode
  • the support 10 is advantageously made of plastic by injection. It comprises a main portion 10.1 extending along the device and a series of portions 10.2 projecting from the main portion 10.1. Reflective surfaces 14 are formed on these protruding portions 10.2, these portions may be intended to penetrate, at least partially, the openings 6 formed in the substrate 4. The reflective surfaces may be made by metallization of the protruding portions 10.2.
  • the light sources 8 are side-illuminated LEDs (commonly referred to as "sideleds"), such as the LSA67F model from Osram®. Of such LEDs illuminate along a main axis which is transverse, preferably perpendicular to the mounting plane on the substrate. These LEDs illuminate in a cone centered on the main axis and can form an angle of the order of 60 ° with said axis, corresponding to an opening angle of the cone of the order of 120 °, the light intensity being maximum on the main axis and greater than or equal to 50% of the maximum value at the limits of the cone in question.
  • the light sources 8 are thus configured to illuminate laterally to the openings 6 to which they are adjacent, respectively, and hence to the corresponding reflective surfaces 14.
  • each light source Part of the luminous flux emitted by each light source is thus reflected by the corresponding reflective surface, and towards the screen 12; another part of the luminous flux being directly directed from the source to the screen 12.
  • the paths of the rays emitted by the light sources are detailed below in relation to the figure 4 .
  • the substrate 4 is advantageously made of electrically insulating material on which one or more printed circuits are formed, in order to supply the light sources 8.
  • the printed circuits are not visible but are in themselves well known to those skilled in the art.
  • a connector 16 may be disposed on the substrate 4, electrically connected to the printed circuit boards and thus to the light sources 8.
  • the substrate is advantageously made of epoxy resin reinforced with glass fibers, for example of the FR-4 type (acronym "Flame Resistant") commonly used as a printed circuit board.
  • the substrate in question advantageously has a reduced thickness, less than or equal to 1.6 mm, so that it can be bent as is visible in FIG. figure 2 .
  • the presence of the openings 6 in the substrate 4 promotes its bending in that they reduce its stiffness and therefore the forces to be applied at its attachment to the support 10 to ensure its maintenance in the bent state.
  • the screen 12 is made of transparent or translucent material, such as in particular PMMA (polymethylmethacrylate). It is advantageously produced by injection. It may comprise fixing means to the support 10, such as in particular clipping lugs 12.1 and / or screw receiving areas 12.2.
  • PMMA polymethylmethacrylate
  • the figure 3 is another perspective view of a luminous device Figures 1 and 2 , where the screen is absent.
  • each aperture 6 has a polygonal shape whose edge 6.1 forms a side.
  • the openings 6 have a generally rectangular shape, it being understood that other shapes are possible.
  • the light sources 8 are arranged on a tongue 18 formed by a portion of the substrate 4 and by two notches 6.2 of the aperture 6, on either side of the edge 6.1. These notches thus advantageously extend along the longitudinal axis of the device. This configuration is particularly advantageous when the substrate is subjected to a bending force, as is the case in the present embodiment. Indeed, these tabs are free of bending stresses applied to the substrate, thus avoiding the application of constraints at the fixing and the connection of light sources to the substrate, as well as the body of these sources themselves.
  • the light sources are arranged along the edge 6.1 so as to illuminate mainly in the direction of the corresponding aperture 6, that is to say the aperture comprising said edge 6.1.
  • each of the reflective surfaces 14 can be subdivided into two portions, namely a first portion 14.1 distal light sources 8 and a second portion 14.2 proximal said sources. These two portions 14.1 and 14.2 are advantageously connected by a projection 14.3.
  • each of the light surfaces 14 or the first and second portions 14.1 and 14.2 of light surfaces 14 may be subdivided longitudinally between two portions, each of said portions being associated with one of the two light sources 8.
  • the figure 4 is a schematic view in longitudinal section of the device of Figures 1 to 3 , the section passing through one of the light sources 8. It is possible to observe the light ray paths emitted by one of the light sources 8 shown, it being understood that these paths also apply to the other light sources.
  • the substrate 4, the support 10 and the screen 12 are rectilinearly represented for reasons of clarity of presentation, it being understood that the principles set out also apply in a curved or curved configuration, such as in the device of the invention. Figures 1 to 3 .
  • the main illumination axis of the light sources is parallel to the openings, in this case the substrate (insofar as it is flat in the illustrated embodiment).
  • the light source 8 thus illuminates in this direction to the corresponding aperture 6.
  • the substrate 4 comprises a first face 4.1 vis-à-vis the screen 12 and a second face 4.2 opposite to the first.
  • the rays 22 emitted in the direction of the screen 12 are refracted and transmitted by the screen 12.
  • the rays 24 emitted through the aperture 6 are reflected by the reflective surface 14 which is situated opposite the said aperture 6.
  • the rays meeting the reflective surface portion 14.1 distal of the light source 8 are reflected to the left of the aperture 6 while the rays meeting the reflective surface portion 14.2 proximal of the light source 8 are reflected to the right of the a journey 6. It is understood that these directions may be different in another embodiment. It can also be observed that the projection 14.3 between the two portions of reflective surfaces 14.1 and 14.2 allows raising or raising of the second portion 14.2 relative to the first portion 14.1. This enhancement provides the second portion 14.2, at the 14.3 projection, an inclination relative to the plane of the a journey greater than the first portion 14.1 at said spring 14.3. The rays incident on the second portion 14.2 are thus reflected further to the right.
  • the construction of the reflecting surface 14 which has just been described thus makes it possible to widen the reflected light beam, which contributes to a homogenization of the luminous image emitted by the screen 12. that this is not represented at the figure 4 , in order to avoid overloading the schematic representation, the rays emitted by the neighboring light sources directly towards the screen portion illuminated by the light beam reflected by the reflecting surface 14, namely the neighboring light sources on the right, are complete the beam in question. This results in a very good homogeneity, despite the use of discrete light sources and the absence of optical light guide.
  • the particular construction of the reflecting surface 14 which has just been described above can be replaced by other profiles of the reflecting surface while obtaining the same effect of spreading the reflected beam. Indeed, it is conceivable to provide a profile without projection but with varying radii of curvatures. It is also conceivable to subdivide the reflective surface into more portions, longitudinally and / or transversely.
  • the reflective surfaces 14 may have diffusing properties in order to diffuse the rays reflected by said surfaces.
  • the screen 12 is advantageously diffusing, it may in particular have a certain roughness at least one of its faces (preferably the exit face) and / or a filler material diffusing within the transparent or translucent material the constituent.
  • the figure 5 illustrates in perspective the light device 2 of Figures 1 to 3 , electrically connected, via the connector 16, to a control unit 26 of the light sources of said device.
  • the light sources of the device can all be connected together so that they can only be switched on together.
  • the light sources associated with each aperture can be powered independently of other light sources.
  • Such a configuration is interesting in that it allows to vary the surface of the illuminated screen, and this in a progressive manner and providing a continuity effect due to the particularly homogeneous nature of the lighting produced.
  • Such a configuration is also interesting for a static lighting, essentially in that it allows to supply different light sources with different electrical intensities, especially for photometric purposes.
  • the Figures 6 to 8 illustrate an example of variation of the illuminated surface of the screen of the device of Figures 1 to 3 and 5 .
  • the control unit 26 ( figure 5 ) makes it possible to progressively supply more light sources, thus increasing the extent of the surface of the illuminated screen, as can be seen in FIG. figure 7 .
  • the figure 8 it is also possible to provide a progressive stop of the supply of light sources, in particular opposite the light sources which are gradually fed, so as to "move" the illuminated surface.
  • Such a modulation or displacement is interesting in combination with a very homogeneous illumination of the screen because it can give the impression similar to that of a liquid whose boundaries move.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

L'invention a trait à un dispositif lumineux (2), notamment pour véhicule automobile, comprenant un substrat (4) ; des sources lumineuses (8) du type diode à électroluminescence à éclairage latéral, disposées sur le substrat (4) et éclairant suivant des directions principales (20) orientées suivant le substrat (4) ; un écran (12) disposé de manière à recevoir les rayons lumineux émis par les sources lumineuses (8). Le substrat (4) comprend des ajours (6) et le dispositif lumineux (2) comprend, en outre, des surfaces réfléchissantes (14) disposées en face des ajours (6) de manière à réfléchir vers l'écran (12) une partie des rayons lumineux émis par les sources lumineuses (8).The invention relates to a light device (2), in particular for a motor vehicle, comprising a substrate (4); light sources (8) of the side-lighting electroluminescence diode type disposed on the substrate (4) and illuminating in principal directions (20) oriented along the substrate (4); a screen (12) arranged to receive the light rays emitted by the light sources (8). The substrate (4) comprises openings (6) and the light device (2) further comprises reflecting surfaces (14) arranged opposite the openings (6) so as to reflect towards the screen (12) a portion light rays emitted by the light sources (8).

Description

L'invention a trait au domaine de l'éclairage et de la signalisation lumineuse, notamment pour véhicule automobile.The invention relates to the field of lighting and light signaling, in particular for a motor vehicle.

Le document de brevet publié FR 2 697 485 A1 divulgue un feu de signalisation comprenant plusieurs sources lumineuses du type diode à électroluminescence (LED) disposées sur un support et éclairant essentiellement perpendiculairement au support vers un écran de diffusion. Le feu de signalisation comprend une ossature avec des orifices sous-lesquels les LEDs sont logées. Ces dernières y sont du type « Brewster », c'est-à-dire d'un type ancien avec des pattes de montage sur un circuit imprimé, lesdites pattes s'étendant axialement sous le corps des LEDs. Un tel montage nécessite une certaine épaisseur qui, dans certaines applications, peut s'avérer ne pas être disponible. Par ailleurs, les LEDs éclairent directement vers l'écran, ce qui confère un aspect pixellisé, ou discret, à l'image lumineuse produite.The published patent document FR 2 697 485 A1 discloses a signaling light comprising a plurality of light emitting diode (LED) type light sources arranged on a support and illuminating substantially perpendicular to the support towards a diffusion screen. The traffic light includes a frame with orifices under which the LEDs are housed. The latter are of the "Brewster" type, that is to say of an old type with mounting tabs on a printed circuit, said tabs extending axially under the body of the LEDs. Such an arrangement requires a certain thickness which, in some applications, may not be available. In addition, the LEDs illuminate directly towards the screen, which gives a pixelated or discreet appearance to the light image produced.

Le document de brevet publié US 2011/0051412 A1 a trait à une unité de rétroéclairage d'écran d'affichage notamment du type à cristaux liquides ou plasma. L'unité de rétroéclairage comprend des sources lumineuses du type diode à électroluminescence (LED) à éclairage latéral. Ces sources sont disposées sur un substrat réfléchissant, la lumière émise majoritairement dans la direction du substrat est réfléchie par la surface réfléchissante dudit substrat vers la face arrière de l'écran d'affichage, en vue de son rétroéclairage. Un tel agencement est intéressant en ce qu'il favorise l'homogénéité du rétroéclairage, évitant l'apparition de points lumineux aux endroits des sources lumineuses, en particulier lorsqu'elles éclairent directement vers l'écran d'affichage. Cet agencement permet également une réduction d'épaisseur de l'unité de rétroéclairage. Il présente cependant pour inconvénient que la puissance lumineuse produite est faible, essentiellement en ce qu'une partie importante de la lumière produite se propage dans l'unité et manque de traverser l'écran.The published patent document US 2011/0051412 A1 relates to a display screen backlight unit, in particular of the liquid crystal or plasma type. The backlight unit includes side-light emitting diode (LED) type light sources. These sources are arranged on a reflective substrate, the light emitted predominantly in the direction of the substrate is reflected by the reflecting surface of said substrate towards the rear face of the display screen, in view of its backlight. Such an arrangement is interesting in that it promotes the homogeneity of the backlight, avoiding the appearance of light spots at the light sources, especially when they illuminate directly to the display screen. This arrangement also allows a reduction in thickness of the backlight unit. However, it has the disadvantage that the light output is low, essentially that a significant portion of the light produced propagates in the unit and fails to cross the screen.

L'invention a pour objectif de proposer un dispositif lumineux palliant au moins un des inconvénients de l'état de la technique susmentionnée. Plus particulièrement, l'invention a pour objectif de proposer un dispositif lumineux de construction mince et produisant une image lumineuse homogène.The object of the invention is to propose a light device that overcomes at least one of the drawbacks of the above-mentioned state of the art. More particularly, the object of the invention is to propose a light device of thin construction and producing a homogeneous luminous image.

L'invention a pour objet un dispositif lumineux, notamment pour véhicule automobile, comprenant : un substrat ; des sources lumineuses du type diode à électroluminescence à éclairage latéral, disposées sur le substrat et éclairant suivant des directions principales orientées suivant le substrat ; un écran disposé de manière à recevoir les rayons lumineux émis par les sources lumineuses ; remarquable en ce que le substrat comprend des ajours et le dispositif lumineux comprend, en outre, des surfaces réfléchissantes disposées en face des ajours de manière à réfléchir vers l'écran une partie des rayons lumineux émis par les sources lumineuses.The subject of the invention is a light device, in particular for a motor vehicle, comprising: a substrate; light sources of the electroluminescence diode type with lateral illumination, arranged on the substrate and illuminating in principal directions oriented along the substrate; a screen arranged to receive the light rays emitted by the light sources; remarkable in that the substrate comprises openings and the light device further comprises reflective surfaces arranged in front of the openings so as to reflect towards the screen part of the light rays emitted by the light sources.

Avantageusement, l'écran est en matériau transparent ou translucide. L'écran est avantageusement diffusant.Advantageously, the screen is made of transparent or translucent material. The screen is advantageously diffusing.

Avantageusement, le substrat est en matériau isolant électriquement, tel que du type FR-4, et comprend un ou plusieurs circuits imprimés configurés pour alimenter les sources lumineuses.Advantageously, the substrate is made of electrically insulating material, such as type FR-4, and comprises one or more printed circuits configured to power the light sources.

Avantageusement, chacune des surfaces réfléchissantes est configurée pour réfléchir la partie de rayons lumineux sensiblement au droit de l'ajour correspondantsuivant un faisceau divergent.Advantageously, each of the reflective surfaces is configured to reflect the portion of light rays substantially to the right of the corresponding aperture undergoing a divergent beam.

Avantageusement, les surfaces réfléchissantes sont également diffusantes.Advantageously, the reflecting surfaces are also diffusing.

Selon un mode avantageux de l'invention, le substrat comprend deux faces principales opposées, l'écran étant disposé en vis-à-vis d'une première desdites faces et les surfaces réfléchissantes étant disposées majoritairement en vis-à-vis de la deuxième desdites faces.According to an advantageous embodiment of the invention, the substrate comprises two opposite main faces, the screen being arranged vis-à-vis a first of said faces and the reflecting surfaces being arranged mainly opposite the second said faces.

Selon un mode avantageux de l'invention, chacune des sources lumineuses est adjacente à un des ajours et éclaire sensiblement en direction dudit ajour.According to an advantageous embodiment of the invention, each of the light sources is adjacent to one of the openings and illuminates substantially in the direction of said aperture.

Selon un mode avantageux de l'invention, au moins deux des sources lumineuses sont respectivement associées à chacun des ajours, .According to an advantageous embodiment of the invention, at least two of the light sources are respectively associated with each of the openings,.

Selon un mode avantageux de l'invention, le substrat s'étend suivant une direction longitudinale, chacun des ajours comprenant un bord s'étendant transversalement à ladite direction, la ou les sources lumineuses adjacentes audit ajour étant disposées le long dudit bord.According to an advantageous embodiment of the invention, the substrate extends in a longitudinal direction, each of the openings comprising an edge extending transversely to said direction, the light source or sources adjacent to said aperture being disposed along said edge.

Selon un mode avantageux de l'invention, le bord de chacun des ajours est sur une portion du substrat formant une languette. La languette ainsi formée est avantageuse en ce qu'elle décharge la zone de réception de la ou des sources lumineuses de contraintes liées à la flexion du substrat lorsque celui-ci présente, à l'état monté, un profil courbe.According to an advantageous embodiment of the invention, the edge of each of the openings is on a portion of the substrate forming a tongue. The tongue thus formed is advantageous in that it discharges the zone of reception of the light source or sources of stresses related to the bending of the substrate when it has, in the mounted state, a curved profile.

Selon un mode avantageux de l'invention, chacune des languettes est formée par deux échancrures de l'ajour correspondant, de part et d'autre du bord correspondant.According to an advantageous embodiment of the invention, each of the tongues is formed by two notches of the corresponding aperture, on either side of the corresponding edge.

Selon un mode avantageux de l'invention, les ajours sont disposés le long de la direction longitudinale et le substrat présente un profil longitudinal courbe.According to an advantageous embodiment of the invention, the openings are arranged along the longitudinal direction and the substrate has a curved longitudinal profile.

Selon un mode avantageux de l'invention, le dispositif comprend un support auquel le substrat et l'écran sont fixés, ledit support comprenant les surfaces réfléchissantes. Cette configuration est avantageuse à plus d'un titre. Elle présente en effet, outre un avantage économique, un avantage de maîtrise des tolérances de positionnement des surfaces réfléchissantes et un avantage de compacité.According to an advantageous embodiment of the invention, the device comprises a support to which the substrate and the screen are fixed, said support comprising the reflecting surfaces. This configuration is advantageous in more ways than one. It has, in addition to an economic advantage, an advantage of controlling the positioning tolerances of the reflective surfaces and a compactness advantage.

Selon un mode avantageux de l'invention, le support comprend des portions en saillie formant les surfaces réfléchissantes et pénétrant partiellement les ajours. Avantageusement, les surfaces réfléchissantes sont réalisées par métallisation de surfaces des portions en saillie. Avantageusement, le support est d'un seul tenant en matériau plastique.According to an advantageous embodiment of the invention, the support comprises projecting portions forming the reflecting surfaces and partially penetrating the openings. Advantageously, the reflective surfaces are made by metallization of surfaces of the protruding portions. Advantageously, the support is in one piece made of plastic material.

Avantageusement, le substrat est fixé au support, par exemple par vissage, clippage ou bouterollage. Avantageusement, l'écran est fixé au support, par exemple par clippage et/ou par vissage ou soudure.Advantageously, the substrate is fixed to the support, for example by screwing, clipping or snapping. Advantageously, the screen is fixed to the support, for example by clipping and / or by screwing or welding.

Selon un mode avantageux de l'invention, chacune des surfaces réfléchissantes comprend une première portion distale de la ou des sources lumineuses correspondantes et une deuxième portion proximale de ladite ou desdits sources lumineuses, la deuxième portion présentant une inclinaison moyenne par rapport à l'ajour plus forte qu'une inclinaison moyenne de la première portion par rapport audit ajour.According to an advantageous embodiment of the invention, each of the reflective surfaces comprises a first distal portion of the corresponding light source (s) and a second proximal portion of the at least one light source, the second portion having a mean inclination with respect to the aperture. stronger than a mean inclination of the first portion relative to said ajour.

Selon un mode avantageux de l'invention, chacune des portions en saillie présente un ressaut entre les première et deuxième portions de la surface réfléchissante. Le fait de prévoir un ressaut est intéressant en ce qu'il permet de choisir quelle partie du cône de lumière émis par la source éclairera la première surface et quelle partie éclairera la seconde : les rayons venus de la source n'ont pas la même orientation selon la fraction du cône dont ils sont issus, ils n'ont pas non plus le même niveau énergétique.According to an advantageous embodiment of the invention, each of the projecting portions has a projection between the first and second portions of the reflecting surface. The fact of providing a projection is interesting in that it allows to choose which part of the cone of light emitted by the source will illuminate the first surface and which part will illuminate the second: the rays coming from the source do not have the same orientation depending on the fraction of the cone they come from, they also do not have the same energy level.

Selon un mode avantageux de l'invention, chacune des première et deuxième portions de chacune des surfaces réfléchissantes présente un profil courbe concave.According to an advantageous embodiment of the invention, each of the first and second portions of each of the reflecting surfaces has a concave curved profile.

Selon un mode avantageux de l'invention, le dispositif comprend, en outre, une unité de commande des sources lumineuses configurée de manière telle qu'au moins deux desdites sources reçoivent deux consignes d'intensité lumineuse différentes. Dans ce cas, toutes les sources lumineuses ne sont pas allumées avec la même intensité, notamment dans un but photométrique.According to an advantageous embodiment of the invention, the device further comprises a light source control unit configured in such a way that at least two of said sources receive two different light intensity instructions. In this case, all the light sources are not lit with the same intensity, especially for a photometric purpose.

Selon un mode avantageux de l'invention, le dispositif comprend, en outre, une unité de commande des sources lumineuses configurée pour allumer progressivement les sources lumineuses de proche en proche suivant une direction donnée de manière à moduler une surface ainsi éclairée de l'écran.According to an advantageous embodiment of the invention, the device further comprises a light source control unit configured to gradually turn on the light sources step by step in a given direction so as to modulate a surface thus illuminated with the screen. .

Selon un mode avantageux de l'invention, l'unité de commande est configurée pour également éteindre progressivement, de proche en proche, les sources lumineuses situées à une extrémité de la surface éclairée qui est opposée, suivant la direction donnée, aux sources lumineuses allumées de proche en proche, de manière à déplacer la surface ainsi éclairée de l'écran.According to an advantageous embodiment of the invention, the control unit is configured to also gradually turn off, step by step, the light sources located at one end of the illuminated surface which is opposite, in the given direction, the light sources on step by step, so as to move the illuminated surface of the screen.

Les mesures de l'invention sont intéressantes en ce qu'elles permettent de réaliser un dispositif lumineux de faible épaisseur avec une grande homogénéité de lumière dans l'image lumineuse produite. Elles permettent également de réaliser un dispositif lumineux cintré ou galbé, et ce de manière économique au moyen notamment d'un substrat initialement plan et apte à subir un cintrage lors de sa fixation au support. La production d'une image lumineuse très homogène présente également l'avantage de pouvoir moduler la surface de l'image lumineuse de manière continue et progressive. Par une telle modulation, des informations peuvent être exprimées. Il peut s'agir de conditions de fonctionnement du véhicule, comme par exemple le fait qu'il accélère ou décélère.The measurements of the invention are interesting in that they make it possible to produce a light device of small thickness with a great homogeneity of light in the light image produced. They also make it possible to produce a curved or curved luminous device, and this in an economical manner by means in particular of an initially flat substrate able to undergo a bending during its attachment to the support. The production of a very homogeneous light image also has the advantage of being able to modulate the surface of the light image in a continuous and progressive manner. By such modulation, information can be expressed. he may be operating conditions of the vehicle, such as for example the fact that it accelerates or decelerates.

D'autres caractéristiques et avantages de la présente invention seront mieux compris à l'aide de la description et des dessins parmi lesquels :

  • La figure 1 est une représentation en perspective d'un dispositif lumineux selon l'invention ;
  • La figure 2 est une représentation éclatée du dispositif lumineux de la figure 1 ;
  • La figure 3 est une représentation selon un autre perspective du dispositif lumineux des figures 1 et 2, le dispositif étant sans l'écran de diffusion ;
  • La figure 4 est une représentation schématique en coupe du dispositif des figures 1 à 3, illustrant les parcours des rayons lumineux ;
  • La figure 5 est une vue arrière du dispositif lumineux des figures 1 à 3, relié électriquement à une unité de commande ;
  • Les figures 6 à 8 illustrent des images lumineuses dynamiques produites par le dispositif lumineux des figures 1 à 3 et 5.
Other features and advantages of the present invention will be better understood from the description and the drawings, among which:
  • The figure 1 is a perspective representation of a light device according to the invention;
  • The figure 2 is an exploded representation of the luminous device of the figure 1 ;
  • The figure 3 is a representation from another perspective of the luminous device of Figures 1 and 2 the device being without the broadcast screen;
  • The figure 4 is a schematic representation in section of the device of Figures 1 to 3 , illustrating the path of light rays;
  • The figure 5 is a rear view of the luminous device of the Figures 1 to 3 electrically connected to a control unit;
  • The Figures 6 to 8 illustrate dynamic light images produced by the luminous device of Figures 1 to 3 and 5 .

Les figures 1 et 2 illustrent en perspective et de manière éclatée un dispositif lumineux selon l'invention.The Figures 1 and 2 illustrate in perspective and exploded light device according to the invention.

Le dispositif lumineux 2 est constitué, essentiellement, d'un substrat 4 pourvu d'ajours 6, de sources lumineuses 8 du type diode à électroluminescence (LED) disposées sur le substrat 4, adjacentes aux ajours 6, d'un support 10 et d'un écran 12 disposé en vis-à-vis du substrat 4 et des sources lumineuses 8.The light device 2 consists essentially of a substrate 4 provided with openings 6, light sources 8 of the electroluminescence diode (LED) type disposed on the substrate 4, adjacent to the openings 6, a support 10 and a a screen 12 arranged vis-à-vis the substrate 4 and light sources 8.

Le support 10 est avantageusement réalisé en matière plastique par injection. Il comprend une portion principale 10.1 s'étendant le long du dispositif et une série de portions 10.2 faisant saillie de la portion principale 10.1. Des surfaces réfléchissantes 14 sont formées sur ces portions en saillie 10.2, ces portions pouvant être destinées à pénétrer, au moins partiellement les ajours 6 formés dans le substrat 4. Les surfaces réfléchissantes peuvent être réalisées par métallisation des portions en saillie 10.2.The support 10 is advantageously made of plastic by injection. It comprises a main portion 10.1 extending along the device and a series of portions 10.2 projecting from the main portion 10.1. Reflective surfaces 14 are formed on these protruding portions 10.2, these portions may be intended to penetrate, at least partially, the openings 6 formed in the substrate 4. The reflective surfaces may be made by metallization of the protruding portions 10.2.

Les sources lumineuses 8 sont des LEDs à éclairage latéral (couramment désignés « sideleds » en anglais), comme par exemple le modèle LSA67F de Osram®. De tels LEDs éclairent suivant un axe principal qui est transversal, préférentiellement perpendiculaire, au plan de montage sur le substrat. Ces LEDs éclairent dans un cône centré sur l'axe principal et pouvant former un angle de l'ordre de 60° avec ledit axe, correspondant à un angle d'ouverture du cône de l'ordre de 120°, l'intensité lumineuse étant maximale sur l'axe principale et supérieure ou égale à 50% de ladite valeur maximale aux limites du cône en question. Les sources lumineuses 8 sont ainsi configurées pour éclairer latéralement vers les ajours 6 auxquels elles sont adjacentes, respectivement, et, partant, vers les surfaces réfléchissantes 14 correspondantes. Une partie du flux lumineux émis par chaque source lumineuse est ainsi réfléchie par la surface réfléchissante correspondante, et ce vers l'écran 12 ; une autre partie du flux lumineux étant directement dirigée de la source à l'écran 12. Les parcours des rayons émis par les sources lumineuses sont détaillés plus bas en relation avec la figure 4.The light sources 8 are side-illuminated LEDs (commonly referred to as "sideleds"), such as the LSA67F model from Osram®. Of such LEDs illuminate along a main axis which is transverse, preferably perpendicular to the mounting plane on the substrate. These LEDs illuminate in a cone centered on the main axis and can form an angle of the order of 60 ° with said axis, corresponding to an opening angle of the cone of the order of 120 °, the light intensity being maximum on the main axis and greater than or equal to 50% of the maximum value at the limits of the cone in question. The light sources 8 are thus configured to illuminate laterally to the openings 6 to which they are adjacent, respectively, and hence to the corresponding reflective surfaces 14. Part of the luminous flux emitted by each light source is thus reflected by the corresponding reflective surface, and towards the screen 12; another part of the luminous flux being directly directed from the source to the screen 12. The paths of the rays emitted by the light sources are detailed below in relation to the figure 4 .

Le substrat 4 est avantageusement en matériau isolant électriquement sur lequel un ou plusieurs circuits imprimés sont formés, en vue d'alimenter les sources lumineuses 8. Les circuits imprimés ne sont pas visibles mais sont en soi bien connus de l'homme de métier. A cet effet, un connecteur 16 peut être disposé sur le substrat 4, relié électriquement aux circuits imprimés et ainsi aux sources lumineuses 8. Le substrat est avantageusement en résine époxy renforcée de fibres de verre, comme par exemple du type FR-4 (acronyme de « Flame Résistant ») couramment utilisé comme support de circuits imprimés. Le substrat en question présente avantageusement une épaisseur réduite, inférieure ou égale à 1.6mm, de manière à pouvoir être cintré comme cela est visible à la figure 2. La présence des ajours 6 dans le substrat 4 favorise sa flexion en ce qu'ils réduisent sa raideur et donc les efforts à appliquer au niveau de sa fixation sur le support 10 pour assurer son maintien à l'état cintré.The substrate 4 is advantageously made of electrically insulating material on which one or more printed circuits are formed, in order to supply the light sources 8. The printed circuits are not visible but are in themselves well known to those skilled in the art. For this purpose, a connector 16 may be disposed on the substrate 4, electrically connected to the printed circuit boards and thus to the light sources 8. The substrate is advantageously made of epoxy resin reinforced with glass fibers, for example of the FR-4 type (acronym "Flame Resistant") commonly used as a printed circuit board. The substrate in question advantageously has a reduced thickness, less than or equal to 1.6 mm, so that it can be bent as is visible in FIG. figure 2 . The presence of the openings 6 in the substrate 4 promotes its bending in that they reduce its stiffness and therefore the forces to be applied at its attachment to the support 10 to ensure its maintenance in the bent state.

L'écran 12 est en matériau transparent ou translucide, comme notamment en PMMA (polyméthacrylate de méthyle). Il est avantageusement réalisé par injection. Il peut comprendre des moyens de fixation au support 10, comme notamment des pattes de clippage 12.1 et/ou des zones de réception de vis 12.2.The screen 12 is made of transparent or translucent material, such as in particular PMMA (polymethylmethacrylate). It is advantageously produced by injection. It may comprise fixing means to the support 10, such as in particular clipping lugs 12.1 and / or screw receiving areas 12.2.

La figure 3 est une autre vue en perspective d'un dispositif lumineux des figures 1 et 2, où l'écran est absent.The figure 3 is another perspective view of a luminous device Figures 1 and 2 , where the screen is absent.

On peut observer le positionnement des surfaces de réflexion 14 en vis-à-vis de chacun des ajours 6 pratiqués dans le substrat 4. Plus spécifiquement, on peut observer qu'en l'occurrence, deux sources lumineuses 8 sont associées à chacun des ajours 6. Il est toutefois entendu que ce nombre peut être différent, à savoir qu'une seule source lumineuse ou encore plus de deux sources lumineuses peuvent être associées à chacun des ajours. Les sources lumineuses 8 de chaque ajour 6 sont disposées le long d'un bord 6.1 de l'ajour. Ce bord 6.1 est avantageusement rectiligne. Il s'étend avantageusement transversalement, préférentiellement perpendiculairement, à un axe longitudinale du dispositif 2. Chaque ajour 6 présente avantageusement une forme polygonale dont le bord 6.1 forme un côté. En l'occurrence les ajours 6 ont une forme généralement rectangulaire, étant entendu que d'autres formes sont envisageables. On peut également observer que les sources lumineuses 8 sont disposées sur une languette 18 formée par une portion du substrat 4 et par deux échancrures 6.2 de l'ajour 6, de part et d'autre du bord 6.1. Ces échancrures s'étendent ainsi avantageusement suivant l'axe longitudinal du dispositif. Cette configuration est particulièrement intéressante lorsque le substrat est soumis à un effort de flexion, comme c'est le cas dans l'exemple de réalisation présent. En effet, ces languettes sont libres des contraintes de flexion appliquées au substrat, évitant ainsi l'application de contraintes au niveau de la fixation et de la connexion de sources lumineuses au substrat, ainsi que du corps de ces sources elles-mêmes. Les sources lumineuses sont disposées le long du bord 6.1 de manière à éclairer majoritairement en direction de l'ajour correspondant 6, c'est-à-dire l'ajour comprenant ledit bord 6.1.We can observe the positioning of the reflection surfaces 14 vis-à-vis each of the openings 6 made in the substrate 4. More specifically, it can be observed that in this case, two light sources 8 are associated with each of the openings 6. It is understood, however, that this number may be different, ie that only one light source or more than two light sources may be associated with each of the openings. The light sources 8 of each aperture 6 are arranged along an edge 6.1 of the aperture. This edge 6.1 is advantageously rectilinear. It advantageously extends transversely, preferably perpendicularly, to a longitudinal axis of the device 2. Each aperture 6 advantageously has a polygonal shape whose edge 6.1 forms a side. In this case the openings 6 have a generally rectangular shape, it being understood that other shapes are possible. It can also be observed that the light sources 8 are arranged on a tongue 18 formed by a portion of the substrate 4 and by two notches 6.2 of the aperture 6, on either side of the edge 6.1. These notches thus advantageously extend along the longitudinal axis of the device. This configuration is particularly advantageous when the substrate is subjected to a bending force, as is the case in the present embodiment. Indeed, these tabs are free of bending stresses applied to the substrate, thus avoiding the application of constraints at the fixing and the connection of light sources to the substrate, as well as the body of these sources themselves. The light sources are arranged along the edge 6.1 so as to illuminate mainly in the direction of the corresponding aperture 6, that is to say the aperture comprising said edge 6.1.

Toujours à la figure 3, on peut observer que les portions en saillie 14.2 du support 14 pénètrent partiellement les ajours 6, respectivement. On peut également observer que les surfaces réfléchissantes 14 sont inclinées par rapport aux ajours de manière à ce que lesdites surfaces sortent des ajours au fur et à mesure que l'on s'éloigne longitudinalement des sources lumineuses associées. On peut par ailleurs également observer que chacune des surfaces réfléchissantes 14 peut être subdivisée en deux portions, à savoir une première portion 14.1 distale des sources lumineuses 8 et une deuxième portion 14.2 proximales desdites sources. Ces deux portions 14.1 et 14.2 sont avantageusement reliées par un ressaut 14.3. Similairement, chacune des surfaces lumineuses 14 ou des première et deuxième portions 14.1 et 14.2 de surfaces lumineuses 14 peut être subdivisée longitudinalement entre deux portions, chacune desdites portions étant associée à une des deux sources lumineuses 8.Always at the figure 3 it can be seen that the projecting portions 14.2 of the support 14 partially penetrate the openings 6, respectively. It can also be observed that the reflective surfaces 14 are inclined relative to the openings so that said surfaces emerge from the openings as one moves away longitudinally from the associated light sources. It can also be observed that each of the reflective surfaces 14 can be subdivided into two portions, namely a first portion 14.1 distal light sources 8 and a second portion 14.2 proximal said sources. These two portions 14.1 and 14.2 are advantageously connected by a projection 14.3. Similarly, each of the light surfaces 14 or the first and second portions 14.1 and 14.2 of light surfaces 14 may be subdivided longitudinally between two portions, each of said portions being associated with one of the two light sources 8.

La figure 4 est une vue schématique en coupe longitudinale du dispositif des figures 1 à 3, la coupe passant par une des sources lumineuses 8. On peut y observer les parcours de rayons lumineux émis par une des sources lumineuses 8 représentée, étant entendu que ces parcours s'appliquent également aux autres sources lumineuses. Le substrat 4, le support 10 et l'écran 12 y sont représentés rectilignes pour des raisons de clarté d'exposé, étant entendu que les principes exposés s'appliquent également dans une configuration cintrée ou galbée, telle qu'au dispositif des figures 1 à 3.The figure 4 is a schematic view in longitudinal section of the device of Figures 1 to 3 , the section passing through one of the light sources 8. It is possible to observe the light ray paths emitted by one of the light sources 8 shown, it being understood that these paths also apply to the other light sources. The substrate 4, the support 10 and the screen 12 are rectilinearly represented for reasons of clarity of presentation, it being understood that the principles set out also apply in a curved or curved configuration, such as in the device of the invention. Figures 1 to 3 .

On peut observer à la figure 4 que l'axe principal 20 d'éclairage des sources lumineuses est parallèle aux ajours, en l'occurrence au substrat (dans la mesure où celui-ci est plan dans le mode de réalisation illustrée). La source lumineuse 8 éclaire ainsi suivant cette direction vers l'ajour correspondant 6. Le substrat 4 comprend une première face 4.1 en vis-à-vis de l'écran 12 et une deuxième face 4.2 opposée à la première. Parmi les rayons émis, les rayons 22 émis en direction de l'écran 12 sont réfractés et transmis par l'écran 12. Par contre, les rayons 24 émis au travers de l'ajour 6 sont réfléchis par la surface réfléchissante 14 qui est située en vis-à-vis dudit ajour 6. Plus spécifiquement, les rayons rencontrant la portion de surface réfléchissante 14.1 distale de la source lumineuse 8 sont réfléchis vers la gauche de l'ajour 6 alors que les rayons rencontrant la portion de surface réfléchissante 14.2 proximale de la source lumineuse 8 sont réfléchis vers la droite de l'ajour 6. Il est entendu que ces directions peuvent être différentes dans un autre mode de réalisation. On peut par ailleurs observer que le ressaut 14.3 entre les deux portions de surfaces réfléchissantes 14.1 et 14.2 permet un relèvement ou rehaussement de la deuxième portion 14.2 par rapport à la première portion 14.1. Ce rehaussement procure à la deuxième portion 14.2, au niveau du ressaut 14.3, une inclinaison par rapport au plan de l'ajour plus importante que sur la première portion 14.1 au niveau dudit ressaut 14.3. Les rayons incidents sur la deuxième portion 14.2 sont ainsi réfléchis d'avantage vers la droite. La construction de la surface réfléchissante 14 qui vient d'être décrite permet ainsi d'élargir le faisceau lumineux réfléchi, ce qui participe à une homogénéisation de l'image lumineuse émise par l'écran 12. Bien que cela ne soit pas représenté à la figure 4, en vue d'éviter de surcharger la représentation schématique, les rayons émis par les sources lumineuses voisines directement vers la portion d'écran éclairée par le faisceau lumineux réfléchi par la surface réfléchissante 14, à savoir les sources lumineuses voisines situées à droite, vont compléter le faisceau en question. Il en résulte alors une très bonne homogénéité, et ce malgré l'utilisation de sources lumineuse discrètes et l'absence de guide optique de lumière.We can observe at figure 4 that the main illumination axis of the light sources is parallel to the openings, in this case the substrate (insofar as it is flat in the illustrated embodiment). The light source 8 thus illuminates in this direction to the corresponding aperture 6. The substrate 4 comprises a first face 4.1 vis-à-vis the screen 12 and a second face 4.2 opposite to the first. Among the rays emitted, the rays 22 emitted in the direction of the screen 12 are refracted and transmitted by the screen 12. On the other hand, the rays 24 emitted through the aperture 6 are reflected by the reflective surface 14 which is situated opposite the said aperture 6. More specifically, the rays meeting the reflective surface portion 14.1 distal of the light source 8 are reflected to the left of the aperture 6 while the rays meeting the reflective surface portion 14.2 proximal of the light source 8 are reflected to the right of the ajour 6. It is understood that these directions may be different in another embodiment. It can also be observed that the projection 14.3 between the two portions of reflective surfaces 14.1 and 14.2 allows raising or raising of the second portion 14.2 relative to the first portion 14.1. This enhancement provides the second portion 14.2, at the 14.3 projection, an inclination relative to the plane of the ajour greater than the first portion 14.1 at said spring 14.3. The rays incident on the second portion 14.2 are thus reflected further to the right. The construction of the reflecting surface 14 which has just been described thus makes it possible to widen the reflected light beam, which contributes to a homogenization of the luminous image emitted by the screen 12. that this is not represented at the figure 4 , in order to avoid overloading the schematic representation, the rays emitted by the neighboring light sources directly towards the screen portion illuminated by the light beam reflected by the reflecting surface 14, namely the neighboring light sources on the right, are complete the beam in question. This results in a very good homogeneity, despite the use of discrete light sources and the absence of optical light guide.

Il est à noter que la construction particulière de la surface réfléchissante 14 qui vient d'être décrite ci-avant peut être remplacée par d'autres profils de la surface réfléchissante tout en obtenant le même effet d'étalement du faisceau réfléchi. En effet, il est envisageable de prévoir un profil sans ressaut mais avec des rayons de courbures variables. Il est également envisageable de subdiviser la surface réfléchissante en davantage de portions, longitudinalement et/ou transversalement.It should be noted that the particular construction of the reflecting surface 14 which has just been described above can be replaced by other profiles of the reflecting surface while obtaining the same effect of spreading the reflected beam. Indeed, it is conceivable to provide a profile without projection but with varying radii of curvatures. It is also conceivable to subdivide the reflective surface into more portions, longitudinally and / or transversely.

Toujours en référence à la figure 4, les surfaces réfléchissantes 14 peuvent présenter des propriétés diffusantes afin de diffuser les rayons réfléchis par lesdites surfaces. Similairement, l'écran 12 est avantageusement diffusant, il peut notamment présenter une certaine rugosité au niveau d'au moins une de ses faces (avantageusement la face de sortie) et/ou un matériau de charge diffusant au sein de la matière transparente ou translucide le constituant.Still referring to the figure 4 the reflective surfaces 14 may have diffusing properties in order to diffuse the rays reflected by said surfaces. Similarly, the screen 12 is advantageously diffusing, it may in particular have a certain roughness at least one of its faces (preferably the exit face) and / or a filler material diffusing within the transparent or translucent material the constituent.

La figure 5 illustre en perspective le dispositif lumineux 2 des figures 1 à 3, relié électriquement, via le connecteur 16, à une unité de commande 26 des sources lumineuses dudit dispositif. Les sources lumineuses du dispositif peuvent être toutes reliées entre elles de sorte qu'elles ne puissent être allumées que toutes ensemble. Alternativement, il est envisageable de prévoir des zones d'alimentation indépendantes, notamment le long de la direction longitudinale du dispositif. En l'occurrence, les sources lumineuses associées à chaque ajour peuvent être alimentées indépendamment des autres sources lumineuses. Une telle configuration est intéressante en ce qu'elle permet de faire varier la surface de l'écran éclairée, et ce de manière progressive et procurant un effet de continuité en raison du caractère particulièrement homogène de l'éclairage produit. Une telle configuration est également intéressante pour un éclairage statique, essentiellement en ce qu'elle permet d'alimenter différences sources lumineuses avec des intensités électriques différentes, notamment à des fins photométriques.The figure 5 illustrates in perspective the light device 2 of Figures 1 to 3 , electrically connected, via the connector 16, to a control unit 26 of the light sources of said device. The light sources of the device can all be connected together so that they can only be switched on together. Alternatively, it is conceivable to provide independent supply zones, especially along the longitudinal direction of the device. In this case, the light sources associated with each aperture can be powered independently of other light sources. Such a configuration is interesting in that it allows to vary the surface of the illuminated screen, and this in a progressive manner and providing a continuity effect due to the particularly homogeneous nature of the lighting produced. Such a configuration is also interesting for a static lighting, essentially in that it allows to supply different light sources with different electrical intensities, especially for photometric purposes.

Les figures 6 à 8 illustrent un exemple de variation de la surface éclairée de l'écran du dispositif des figures 1 à 3 et 5. A la figure 6 on peut observer qu'une portion droite de l'écran est éclairée. L'unité de commande 26 (figure 5) permet d'alimenter progressivement davantage de sources lumineuses, augmentant ainsi l'étendue de la surface de l'écran éclairée, comme cela est visible à la figure 7. En référence à la figure 8, il est également possible de prévoir un arrêt progressif de l'alimentation de sources lumineuses, notamment à l'opposé des sources lumineuses qui sont progressivement alimentées, à de manière à « déplacer » la surface éclairée. Une telle modulation ou un tel déplacement est intéressant en combinaison avec un éclairage très homogène de l'écran car il peut donner l'impression similaire à celle d'un liquide dont les limites se déplacent.The Figures 6 to 8 illustrate an example of variation of the illuminated surface of the screen of the device of Figures 1 to 3 and 5 . To the figure 6 it can be seen that a straight portion of the screen is illuminated. The control unit 26 ( figure 5 ) makes it possible to progressively supply more light sources, thus increasing the extent of the surface of the illuminated screen, as can be seen in FIG. figure 7 . With reference to the figure 8 it is also possible to provide a progressive stop of the supply of light sources, in particular opposite the light sources which are gradually fed, so as to "move" the illuminated surface. Such a modulation or displacement is interesting in combination with a very homogeneous illumination of the screen because it can give the impression similar to that of a liquid whose boundaries move.

Claims (16)

Dispositif lumineux (2), notamment pour véhicule automobile, comprenant : - un substrat (4) ; - des sources lumineuses (8) du type diode à électroluminescence à éclairage latéral, disposées sur le substrat (4) et éclairant suivant des directions principales (20) orientées suivant le substrat (4) ; - un écran (12) disposé de manière à recevoir les rayons lumineux émis par les sources lumineuses (8) ; caractérisé en ce que
le substrat (4) comprend des ajours (6) et le dispositif lumineux (2) comprend, en outre, des surfaces réfléchissantes (14) disposées en face des ajours (6) de manière à réfléchir vers l'écran (12) une partie des rayons lumineux émis par les sources lumineuses (8).Luminous device (2), in particular for a motor vehicle, comprising: a substrate (4); - Light sources (8) of the electroluminescence diode type with lateral illumination, arranged on the substrate (4) and illuminating in principal directions (20) oriented along the substrate (4); a screen (12) arranged to receive the light rays emitted by the light sources (8); characterized in that
the substrate (4) comprises perforations (6) and the luminous device (2) further comprises reflecting surfaces (14) arranged opposite the perforations (6) so as to reflect towards the screen (12) a part light rays emitted by the light sources (8). Dispositif lumineux (2) selon la revendication 1, caractérisé en ce que le substrat (4) comprend deux faces principales opposées (4.1, 4.2), l'écran (12) étant disposé en vis-à-vis d'une première (4.1) desdites faces et les surfaces réfléchissantes (14) étant disposées majoritairement en vis-à-vis de la deuxième (4.2) desdites faces.Light device (2) according to claim 1, characterized in that the substrate (4) comprises two opposite main faces (4.1, 4.2), the screen (12) being arranged opposite a first one (4.1, 4.2). ) of said faces and the reflecting surfaces (14) being arranged mainly opposite the second (4.2) of said faces. Dispositif lumineux (2) selon l'une des revendications 1 et 2, caractérisé en ce que chacune des sources lumineuses (8) est adjacente à un des ajours (6) et éclaire sensiblement en direction dudit ajour (6).Light device (2) according to one of claims 1 and 2, characterized in that each of the light sources (8) is adjacent to one of the openings (6) and illuminates substantially in the direction of said aperture (6). Dispositif lumineux (2) selon la revendication 3, caractérisé en ce qu'au moins deux des sources lumineuses (8) sont respectivement associées à chacun des ajours (6).Light device (2) according to claim 3, characterized in that at least two of the light sources (8) are respectively associated with each of the openings (6). Dispositif lumineux (2) selon l'une des revendications 3 et 4, caractérisé en ce que le substrat (4) s'étend suivant une direction longitudinale, chacun des ajours (6) comprenant un bord (6.1) s'étendant transversalement à ladite direction, la ou les sources lumineuses (8) adjacentes audit ajour (6) étant disposées le long dudit bord (6.1).Light device (2) according to one of claims 3 and 4, characterized in that the substrate (4) extends in a longitudinal direction, each of the openings (6) comprising an edge (6.1) extending transversely to said direction, the light source (s) (8) adjacent said aperture (6) being disposed along said edge (6.1). Dispositif lumineux (2) selon la revendication 5, caractérisé en ce que le bord (6.1) de chacun des ajours (6) est sur une portion du substrat (4) formant une languette (18).Light device (2) according to claim 5, characterized in that the edge (6.1) of each of the openings (6) is on a portion of the substrate (4) forming a tongue (18). Dispositif lumineux (2) selon la revendication 6, caractérisé en ce que chacune des languettes (18) est formée par deux échancrures (6.2) de l'ajour correspondant (6), de part et d'autre du bord correspondant (6.1).Light device (2) according to claim 6, characterized in that each of the tongues (18) is formed by two notches (6.2) of the corresponding aperture (6), on either side of the corresponding edge (6.1). Dispositif lumineux (2) selon l'une des revendications 5 à 7, caractérisé en ce que les ajours (6) sont disposés le long de la direction longitudinale et le substrat (4) présente un profil longitudinal courbe.Light device (2) according to one of claims 5 to 7, characterized in that the openings (6) are arranged along the longitudinal direction and the substrate (4) has a curved longitudinal profile. Dispositif lumineux (2) selon l'une des revendications 1 à 8, caractérisé en ce que ledit dispositif comprend un support (10) auquel le substrat (4) et l'écran (12) sont fixés, ledit support (10) comprenant les surfaces réfléchissantes (14).Light device (2) according to one of claims 1 to 8, characterized in that said device comprises a support (10) to which the substrate (4) and the screen (12) are fixed, said support (10) comprising the reflective surfaces (14). Dispositif lumineux (2) selon la revendication 9, caractérisé en ce que le support (10) comprend des portions en saillie (10.2) formant les surfaces réfléchissantes (14) et pénétrant partiellement les ajours (6).Light device (2) according to claim 9, characterized in that the support (10) comprises projecting portions (10.2) forming the reflecting surfaces (14) and partially penetrating the openings (6). Dispositif lumineux (2) selon l'une des revendications 1 à 10, caractérisé en ce que chacune des surfaces réfléchissantes (14) comprend une première portion (14.1) distale de la ou des sources lumineuses correspondantes (8) et une deuxième portion (14.2) proximale de ladite ou desdits sources lumineuses (8), la deuxième portion (14.2) présentant une inclinaison moyenne par rapport à l'ajour (6) qui est plus forte qu'une inclinaison moyenne de la première portion (14.1) par rapport audit ajour.Light device (2) according to one of claims 1 to 10, characterized in that each of the reflecting surfaces (14) comprises a first portion (14.1) distal to the corresponding light source (s) (8) and a second portion (14.2) ) proximal to said one or more light sources (8), the second portion (14.2) having a mean inclination with respect to the aperture (6) which is greater than a mean inclination of the first portion (14.1) relative to said up to date. Dispositif lumineux (2) selon la revendication 11, caractérisé en ce que chacune des portions en saillie (10.2) présente un ressaut (14.3) entre les première et deuxième portions (14.1, 14.2) de la surface réfléchissante correspondante (14).Light device (2) according to claim 11, characterized in that each of the projecting portions (10.2) has a projection (14.3) between the first and second portions (14.1, 14.2) of the corresponding reflecting surface (14). Dispositif lumineux (2) selon l'une des revendications 11 et 12, caractérisé en ce que chacune de première et deuxième portions (14.1, 14.2) de chacune des surfaces réfléchissantes (14) présente un profil courbe concave.Light device (2) according to one of claims 11 and 12, characterized in that each of first and second portions (14.1, 14.2) of each of the reflective surfaces (14) has a concave curved profile. Dispositif lumineux (2) selon l'une des revendication 1 à 13, caractérisé en ce que ledit dispositif comprend, en outre, une unité de commande (26) des sources lumineuses (8) configurée de manière telle qu'au moins deux desdites sources reçoivent deux consignes d'intensité lumineuse différentes.Light device (2) according to one of claims 1 to 13, characterized in that said device further comprises a control unit (26) of the sources light source (8) configured such that at least two of said sources receive two different light intensity indications. Dispositif lumineux (2) selon l'une des revendications 1 à 14, caractérisé en ce que ledit dispositif comprend, en outre, une unité de commande (26) des sources lumineuses (8) configurée pour allumer progressivement les sources lumineuses de proche en proche suivant une direction donnée de manière à moduler une surface ainsi éclairée de l'écran.Light device (2) according to one of claims 1 to 14, characterized in that said device further comprises a control unit (26) of the light sources (8) configured to gradually turn on the light sources step by step in a given direction so as to modulate an illuminated surface of the screen. Dispositif lumineux (2) selon la revendication 15, caractérisé en ce que l'unité de commande (26) est configurée pour également éteindre progressivement, de proche en proche, les sources lumineuses situées à une extrémité de la surface éclairée qui est opposée, suivant la direction donnée, aux sources lumineuses allumées de proche en proche, de manière à déplacer la surface ainsi éclairée de l'écran.Light device (2) according to claim 15, characterized in that the control unit (26) is configured to gradually switch off, step by step, the light sources located at one end of the illuminated surface which is opposite, following the given direction, the light sources lit gradually, so as to move the illuminated surface of the screen.
EP18193052.0A 2017-09-12 2018-09-06 Lighting device with a low profile and uniform illumination Active EP3467375B1 (en)

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CN109506199A (en) 2019-03-22
US10551025B2 (en) 2020-02-04

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