EP3014172B1 - Indirect lighting device for a motor vehicle tail light - Google Patents

Indirect lighting device for a motor vehicle tail light Download PDF

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Publication number
EP3014172B1
EP3014172B1 EP14790119.3A EP14790119A EP3014172B1 EP 3014172 B1 EP3014172 B1 EP 3014172B1 EP 14790119 A EP14790119 A EP 14790119A EP 3014172 B1 EP3014172 B1 EP 3014172B1
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EP
European Patent Office
Prior art keywords
diffusing element
lighting device
lighting
light
diffusing
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EP14790119.3A
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German (de)
French (fr)
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EP3014172A2 (en
Inventor
Alain Buisson
Yves Fichot
Aurélie SORNIN
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Marelli Automotive Lighting France SAS
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Marelli Automotive Lighting France SAS
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Publication of EP3014172A2 publication Critical patent/EP3014172A2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/40—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/31—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
    • F21S43/33—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors characterised by their material, surface treatment or coatings

Description

La présente invention concerne le domaine de l'éclairage et de la signalisation des véhicules, notamment des véhicules automobiles. Elle concerne plus particulièrement un dispositif pour feu de signalisation de véhicules comprenant un éclairage indirect dont la lumière, émise par au moins une LED, est réfléchie par un matériau diffusant qui la dirige vers une optique de sortie, elle-même diffusante, avec plusieurs variantes possibles selon les besoins.The present invention relates to the field of vehicle lighting and signaling, in particular motor vehicles. It relates more particularly to a device for a vehicle traffic light comprising indirect lighting, the light of which, emitted by at least one LED, is reflected by a diffusing material which directs it towards an output optic, itself diffusing, with several variants possible as needed.

La réglementation en vigueur impose, selon les types de véhicules, différents feux d'éclairage ou de signalisation. Mais, outre le volume de l'ensemble des feux, les performances et l'uniformité d'éclairement des feux individuels ainsi regroupés sont des préoccupations majeures.The regulations in force impose, depending on the type of vehicle, different lighting or signaling lights. But, in addition to the volume of all the lights, the performance and the uniformity of illumination of the individual lights thus grouped together are major concerns.

On connaît déjà dans l'art antérieur des écrans auxiliaires transparents dans lesquels peut se propager la lumière émise par une source de lumière auxiliaire, ces écrans étant destinés à équiper un feu, notamment arrière, d'un véhicule automobile. Des discontinuités locales prévues dans le matériau de l'écran constituent des foyers de diffusion de la lumière hors de ces écrans (voir publication de brevet français No. 2 868 506 ).Transparent auxiliary screens are already known in the prior art in which the light emitted by an auxiliary light source can propagate, these screens being intended to equip a light, in particular a rear light, of a motor vehicle. Local discontinuities provided in the material of the screen constitute foci of light scattering outside these screens (see patent publication French No. 2 868 506 ).

Dans la demande de brevet allemand DE 101 01 795 sont décrits des feux clignotants, notamment des clignotants avant pour véhicules automobiles, dans lesquels une source de lumière auxiliaire pour feu de position illumine un élément disposé transversalement dans l'espace entre le feu principal et la glace frontale, et procure à travers celle-ci un éclairement de même direction que celle du feu principal.In the German patent application DE 101 01 795 flashing lights are described, in particular front turn signals for motor vehicles, in which an auxiliary light source for a position light illuminates an element arranged transversely in the space between the main light and the front window, and provides through the latter illumination from the same direction as that of the main light.

Dans la demande de brevet français 01 00048 , publiée sous le numéro 2 819 040, est décrit un composant d'optique ou de style pour l'éclairage ou la signalisation de véhicules automobiles. Ce composant est en matériau transparent, à l'intérieur duquel des foyers de diffusion de la lumière sont situés uniquement en des endroits prédéterminés pour diffuser la lumière émise par une source associée au dispositif d'éclairage ou de signalisation concerné. Ce composant peut constituer la glace d'un projecteur de véhicule automobile, ou un insert placé dans un tel projecteur.In the patent application French 01 00048 , published under number 2,819,040, describes an optical or styling component for the lighting or signaling of motor vehicles. This component is made of transparent material, inside which light diffusion focal points are located only at predetermined places to diffuse the light emitted by a source associated with the lighting or signaling device concerned. This component can constitute the lens of a motor vehicle headlamp, or an insert placed in such a headlamp.

Dans la demande de brevet allemand DE 103 11 317 est décrit un dispositif d'éclairage pour véhicule comportant un guide de lumière comprenant des structures de diffusion situées essentiellement au foyer de surfaces réfléchissantes qui laissent ainsi diffuser un éclairement homogène. D'autres dispositifs d'éclairage comprenant des éléments diffusants sont connus des US 2012/163031 A1 , US 2011/317442 A1 ou US 2011/128751 A1 .In the German patent application DE 103 11 317 A lighting device for a vehicle is described comprising a light guide comprising diffusion structures located essentially at the focal point of reflective surfaces which thus allow homogeneous illumination to be diffused. Other lighting devices comprising diffusing elements are known from US 2012/163031 A1 , US 2011/317442 A1 Or US 2011/128751 A1 .

D'autre part, la présente demanderesse a conçu et a décrit, dans la demande de brevet français déposée le 30.01.2012 sous le No. 12 00270 , un nouveau dispositif pour feu d'éclairage et/ou de signalisation de véhicule automobile, comportant une ou plusieurs LEDs et incorporant un guide de lumière, caractérisé en ce qu'il comprend, combiné avec ledit guide, un écran translucide, ledit écran translucide étant muni d'un grainage et disposé entre ledit guide et la face visible du feu ou de l'ensemble de feux concerné, de manière à procurer une fonction lumineuse de couleur homogène, tandis que ledit écran translucide est muni d'un grainage sur l'une ou l'autre ou les deux de ses faces principales aptes à être traversées par la lumière émise par la ou les LEDs, et tandis que la pièce de matériau translucide est placée en avant dudit guide, avantageusement à une distance d'environ 5 à 20 mm dudit guide.On the other hand, the present applicant has designed and described, in the patent application French filed on 30.01.2012 under No. 12 00270 , a new device for a motor vehicle lighting and/or signaling light, comprising one or more LEDs and incorporating a light guide, characterized in that it comprises, combined with said guide, a translucent screen, said translucent screen being provided with graining and arranged between said guide and the visible face of the light or of the set of lights concerned, so as to provide a luminous function of homogeneous color, while said translucent screen is provided with graining on the one or the other or both of its main faces capable of being crossed by the light emitted by the LED(s), and while the piece of translucent material is placed in front of said guide, advantageously at a distance of approximately 5 20 mm from said guide.

Dans ces diverses applications et ces divers modes de réalisation d'écrans lumineux diffusant la lumière émise par au moins une LED, il peut apparaître des inhomogénéités dans la lumière diffusée, en particulier au niveau des guides, y compris ceux qui peuvent être munis de rideaux ou d'écrans diffuseurs.In these various applications and these various embodiments of luminous screens diffusing the light emitted by at least one LED, inhomogeneities may appear in the diffused light, in particular at the level of the guides, including those which may be provided with curtains or diffuser screens.

Il est donc apparu utile de chercher à uniformiser le rendu lumineux de tels feux comportant éventuellement un guide de lumière, ou à en masquer les éventuelles inhomogénéités.It therefore appeared useful to seek to standardize the luminous rendering of such lights optionally comprising a light guide, or to mask any inhomogeneities therein.

La présente invention a pour premier objet un dispositif pour feu d'éclairage et/ou de signalisation, notamment pour feux arrière de véhicule automobile, tel que défini ci- dessus et dans la description qui suit. L'invention a également pour objet un bloc optique comportant un tel dispositif, ainsi que l'utilisation dudit dispositif pour l'éclairage ou la signalisation, notamment mais non exclusivement dans des feux arrière de véhicules automobiles.The first subject of the present invention is a device for a lighting and/or signaling light, in particular for motor vehicle rear lights, as defined above and in the following description. The invention also relates to an optical unit comprising such a device, as well as the use of said device for lighting or signaling, in particular but not exclusively in the taillights of motor vehicles.

La présente invention concerne ainsi un dispositif d'éclairage pour feu d'éclairage et/ou de signalisation de véhicule, notamment pour feux arrière, caractérisé en ce qu'il comporte dans un boîtier:

  • au moins une source de lumière à LED, fixée sur un support opaque comportant une ouverture d'éclairage destinée au passage de la lumière à diffuser indirectement vers l'observateur, - un premier élément diffusant opaque situé en amont de l'ouverture d'éclairage et adapté pour réfléchir et diffuser la lumière issue de la source de lumière en direction de l'ouverture,
  • un deuxième élément diffusant translucide situé en aval du premier élément diffusant au droit de l'ouverture d'éclairage et destiné à transmettre et diffuser la lumière réfléchie et diffusée par du premier élément diffusant,
  • un troisième élément diffusant translucide situé en aval du deuxième élément diffusant et adapté pour transmettre et diffuser la lumière issue du deuxième élément diffusant en direction de l'extérieur du feu concerné, ledit troisième élément diffusant contribuant à la géométrie du feu à l'état allumé et définissant un volume de diffusion par son profil débordant en saillie vers l'extérieur du feu au niveau de l'ouverture d'éclairage.
The present invention thus relates to a lighting device for a vehicle lighting and/or signaling light, in particular for rear lights, characterized in that it comprises in a housing:
  • at least one LED light source, fixed on an opaque support comprising a lighting opening intended for the passage of the light to be diffused indirectly towards the observer, - a first opaque diffusing element located upstream of the lighting opening and adapted to reflect and diffuse the light coming from the light source in the direction of the opening,
  • a second translucent diffusing element located downstream of the first diffusing element in line with the lighting opening and intended to transmit and diffuse the light reflected and diffused by the first diffusing element,
  • a third translucent diffusing element located downstream of the second diffusing element and suitable for transmitting and diffusing the light issuing from the second diffusing element in the direction of the outside of the lamp concerned, said third diffusing element contributing to the geometry of the lamp in the lit state and defining a diffusion volume by its protruding profile projecting outwards from the light at the level of the lighting opening.

La mise en oeuvre de trois éléments diffusants sur le trajet de la lumière avant sa perception par un observateur permet de maîtriser au mieux l'homogénéité perçue en atténuant l'effet de sources lumineuses ponctuelles induites par la ou les diodes électroluminescentes, en abrégé DEL ou LED pour en anglais « electro luminescent diode », constitutives de la source de lumière selon l'invention. De plus, le fait que les trois éléments diffusants ne sont pas juxtaposés mais éloignés les un des autres permet de mieux exploiter leur effet diffusant. Par ailleurs, il doit être remarqué que chaque élément diffusant offre au moins deux moyens de moduler la diffusion qu'il induit à savoir la nature du matériau qui le constitue et/ou l'état de l'une de ses surfaces extérieures.The implementation of three diffusing elements on the path of the light before its perception by an observer makes it possible to better control the perceived homogeneity by attenuating the effect of point light sources induced by the light-emitting diode(s), abbreviated LED or LED for “electro luminescent diode”, constituting the light source according to the invention. In addition, the fact that the three diffusing elements are not juxtaposed but distant from one another makes it possible to better exploit their diffusing effect. Furthermore, it should be noted that each diffusing element offers at least two means of modulating the diffusion which it induces, namely the nature of the material which constitutes it and/or the state of one of its external surfaces.

Le dispositif d'éclairage selon l'invention met en oeuvre un éclairage indirect en ce sens que la lumière issue de la source de lumière sort du dispositif d'éclairage après réflexion sur la surface du premier élément diffusant. Ainsi la source de lumière est portée par un support opaque qui fait obstacle à toute sortie directe de la lumière à l'extérieur du dispositif d'éclairage.The lighting device according to the invention implements indirect lighting in the sense that the light issuing from the light source leaves the lighting device after reflection on the surface of the first diffusing element. Thus the light source is carried by an opaque support which obstructs any direct exit of light outside the lighting device.

Selon une caractéristique de l'invention, afin d'augmenter la quantité de lumière réfléchie le premier élément diffusant est de couleur blanche opalescente. Une telle couleur permet une réflexion efficace de la lumière.According to one characteristic of the invention, in order to increase the amount of reflected light, the first diffusing element is opalescent white in color. Such a color allows efficient reflection of light.

Selon une autre caractéristique la surface de réflexion du premier élément diffusant présente un état de surface irrégulier. Par état de surface irrégulier il convient d'entendre que la surface de réflexion du premier élément diffusant ne comprend pas un motif régulier tel que des miroirs ou des lentilles de Fresnel mais un motif irrégulier aléatoire ou pseudo aléatoire. Ainsi, le caractère irrégulier de l'état de surface peut être assimilé à un caractère non homogène. Cet état irrégulier peut par exemple être obtenu par grainage. On entend ici par grainage la formation de discontinuités dans et/ou sur le matériau constitutif de l'élément diffusant concerné.According to another characteristic, the reflection surface of the first diffusing element has an irregular surface state. By irregular surface condition it should be understood that the reflection surface of the first diffusing element does not comprise a regular pattern such as mirrors or Fresnel lenses but a random or pseudo-random irregular pattern. Thus, the irregular character of the surface condition can be assimilated to an inhomogeneous character. This irregular state can for example be obtained by graining. Graining here means the formation of discontinuities in and/or on the constituent material of the diffusing element concerned.

Classiquement, le matériau grainé peut alors être réalisé:

  • sans adjonction ni retrait de matière, par traitement approprié de tout ou partie de la paroi intérieure du moule de confection de l'élément à grainer, et/ou
  • par addition de matière réactive apte à générer des inclusions dans la matière servant à élaborer l'élément diffusant ou écran opalin grainé, dans les conditions de préparation de celui-ci,
dans les deux cas selon des techniques connues de l'homme du métier, qui sait adapter la rugosité obtenue à l'effet recherché.Conventionally, the grained material can then be made:
  • without adding or removing material, by appropriate treatment of all or part of the inner wall of the mold for making the element to be grained, and/or
  • by adding reactive material capable of generating inclusions in the material used to produce the diffusing element or grained opaline screen, under the conditions of preparation thereof,
in both cases according to techniques known to those skilled in the art, who knows how to adapt the roughness obtained to the desired effect.

Selon une autre caractéristique de l'invention, le premier élément diffusant est réalisé dans un matériau chargé de particules de dimensions supérieures ou égales au micron et/ou comprenant des inclusions de dimensions supérieures ou égales au micron. Le matériau constitutif du premier élément diffusant est alors un matériau non homogène tel qu'un matériau opalin. Un tel matériau de type opalin peut par exemple être du PMMA (poly méthacrylate de méthyle) ou du PC (polycarbonate) auquel sont additionnées des matières choisies parmi des microbilles de matériau à effet opalescent ou une matière dispersable, notamment pour créer des inclusions telles que des micro bulles par l'injection et la distribution d'un gaz, notamment C02 , pour conférer un caractère aléatoire à l'opalescence produite. Le matériau opalin peut être blanc ou être coloré, notamment pour apparaître de couleur ambre ou bleu super-léger, par des techniques connues de l'homme du métier. Il peut ainsi permettre d'obtenir une couleur à l'état allumé différente de la couleur à l'état éteint. Il également possible d'utiliser dans la source de lumière une ou plusieurs LED qui émettent une lumière colorée par exemple rouge ou ambre.According to another characteristic of the invention, the first diffusing element is made of a material loaded with particles of dimensions greater than or equal to one micron and/or comprising inclusions of dimensions greater than or equal to one micron. The constituent material of the first diffusing element is then an inhomogeneous material such as an opaline material. Such an opaline type material can for example be PMMA (poly methyl methacrylate) or PC (polycarbonate) to which are added materials chosen from microbeads of material with an opalescent effect or a dispersible material, in particular to create inclusions such as micro bubbles by injecting and distributing a gas, in particular C02, to give a random character to the opalescence produced. The opaline material can be white or be colored, in particular to appear super-light amber or blue, by techniques known to those skilled in the art. It can thus make it possible to obtain a color in the on state that is different from the color in the off state. It is also possible to use in the light source one or more LEDs which emit colored light, for example red or amber.

De manière préférée, les deuxième et troisième éléments diffusants sont translucides. Cet état translucide peut être obtenu de différentes manières, soit par l'état de l'une ou l'autre voire des deux surfaces externes de chaque élément diffusant soit par la nature du matériau qui le constitue, soit la combinaison de plusieurs de ces trois moyens.Preferably, the second and third diffusing elements are translucent. This translucent state can be obtained in different ways, either by the state of one or the other or even of the two external surfaces of each diffusing element or by the nature of the material which constitutes it, or the combination of several of these three means.

Selon une caractéristique de l'invention, la surface avant et/ou la surface arrière du deuxième élément diffusant présente un état de surface irrégulier. Cet état irrégulier peut être obtenu de la même manière que pour l'état irrégulier de la surface de réflexion du premier élément diffusant. Les termes avant et arrière sont utilisés dans le cadre de la présente invention en rapport au trajet de la lumière issue de la source de lumière à LED, la face avant recevant la lumière avant la face arrière. Il en est de même pour les termes amont et aval.According to one characteristic of the invention, the front surface and/or the rear surface of the second diffusing element has an irregular surface state. This irregular state can be obtained in the same way as for the irregular state of the reflection surface of the first diffusing element. The terms front and rear are used in the context of the present invention in relation to the path of the light coming from the LED light source, the front face receiving the light before the rear face. The same is true for the terms upstream and downstream.

Selon une autre caractéristique de l'invention, le deuxième élément diffusant est réalisé dans un matériau chargé de particules de dimensions supérieures ou égal au micron et/ou comprenant des inclusions de dimensions supérieures ou égales au micron. Un tel matériau chargé peut être un matériau transparent coloré ou non dont les inclusions lui confèrent un caractère translucide. Le matériau, dit également matrice, peut être du PMMA (poly méthacrylate de méthyle) ou du PC (polycarbonate).According to another characteristic of the invention, the second diffusing element is made of a material filled with particles of dimensions greater than or equal to one micron and/or comprising inclusions of dimensions greater than or equal to one micron. Such a filled material can be a transparent material, colored or not, the inclusions of which give it a translucent character. The material, also called matrix, can be PMMA (poly methyl methacrylate) or PC (polycarbonate).

Selon une autre caractéristique de l'invention, la surface avant et/ou la surface arrière du troisième élément diffusant présente un état de surface irrégulier. Cet état de surface irrégulier peut être analogue à l'éventuel état de surface irrégulier du deuxième élément diffusant.According to another characteristic of the invention, the front surface and/or the rear surface of the third diffusing element has an irregular surface state. This irregular surface condition can be analogous to any irregular surface condition of the second diffusing element.

Selon une autre caractéristique de l'invention, le troisième élément diffusant est réalisé dans un matériau chargé de particules de dimensions supérieures ou égal au micron et/ou comprenant des inclusions de dimensions supérieures ou égales au micron. Ce matériau chargé translucide peut être comme décrit précédemment pour le deuxième élément diffusant.According to another characteristic of the invention, the third diffusing element is made of a material filled with particles of dimensions greater than or equal to one micron and/or comprising inclusions of dimensions greater than or equal to one micron. This translucent filled material can be as described previously for the second diffusing element.

Selon une forme de réalisation de l'invention le dispositif d'éclairage comprend un voyant transparent et/ou translucide adapté pour fermer le boîtier. De manière préférée le voyant assure une fermeture étanche à l'eau.According to one embodiment of the invention, the lighting device comprises a transparent and/or translucent indicator adapted to close the case. Preferably, the sight glass provides watertight closure.

Selon une autre forme de réalisation, le troisième élément diffusant est adapté pour fermé le boîtier. De manière préférée, le troisième élément diffusant assure une fermeture étanche à l'eau.According to another embodiment, the third diffusing element is suitable for closing the case. Preferably, the third diffusing element provides a watertight closure.

Selon une variante de cette forme de réalisation, le troisième élément diffusant possède une surface arrière lisse.According to a variant of this embodiment, the third diffusing element has a smooth rear surface.

Selon une caractéristique de l'invention, le support opaque est situé sur la face arrière ou sur la face avant d'une portion du troisième élément diffusant qui est décalée par rapport à l'ouverture d'éclairage et qui porte la source de lumière.According to one characteristic of the invention, the opaque support is located on the rear face or on the front face of a portion of the third diffusing element which is offset with respect to the lighting opening and which carries the light source.

Selon une variante de cette caractéristique, le deuxième élément diffusant est doublé, de préférence par surmoulage, par la portion décalée du troisième élément diffusant.According to a variant of this characteristic, the second diffusing element is doubled, preferably by overmoulding, by the offset portion of the third diffusing element.

Selon une autre caractéristique de l'invention, le deuxième élément diffusant porte l' élément opaque qui l'occulte en partie.According to another characteristic of the invention, the second diffusing element bears the opaque element which partially conceals it.

Bien entendu, les différentes caractéristiques, variantes et formes de réalisation de l'invention peuvent être associées les unes avec les autres selon diverses combinaisons dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres.Of course, the different characteristics, variants and embodiments of the invention can be associated with each other in various combinations insofar as they are not incompatible or exclusive of each other.

Par ailleurs, diverses autres caractéristiques de l'invention ressortent de la description annexée effectuée en référence aux dessins qui illustrent des formes non limitatives de réalisation d'un dispositif d'éclairage conforme à l'invention.

  • Fig. 1 est une représentation schématique en élévation d'une coupe horizontale d'un dispositif d'éclairage selon l'invention,
  • Fig. 2 est une représentation schématique en élévation d'une coupe horizontale d'une variante du dispositif d'éclairage selon l'invention,
  • Fig. 3 est une représentation schématique en élévation d'une coupe horizontale d'une autre variante du dispositif d'éclairage selon l'invention,
Il est à noter que sur ces figures les éléments structurels et/ou fonctionnels communs aux différentes variantes peuvent présenter les mêmes références.Furthermore, various other characteristics of the invention emerge from the appended description made with reference to the drawings which illustrate non-limiting embodiments of a lighting device according to the invention.
  • Fig. 1 is a schematic representation in elevation of a horizontal section of a lighting device according to the invention,
  • Fig. 2 is a schematic representation in elevation of a horizontal section of a variant of the lighting device according to the invention,
  • Fig. 3 is a schematic representation in elevation of a horizontal section of another variant of the lighting device according to the invention,
It should be noted that in these figures the structural and/or functional elements common to the different variants may have the same references.

Comme le montre la Fig. 1 un dispositif d'éclairage selon l'invention comprend dans un boîtier 1 au moins une source de lumière à LED comprenant au moins une plaque de circuit imprimé ou PCB 2 portant au moins une LED 3. La source de lumière est fixée sur un support opaque 4 comportant au moins une ouverture d'éclairage 5. Le dispositif d'éclairage comprend alors un premier élément diffusant 6 adapté pour réfléchir et diffuser la lumière en direction de l'ouverture d'éclairage 5.As shown in Fig. 1 a lighting device according to the invention comprises in a housing 1 at least one LED light source comprising at least one printed circuit board or PCB 2 carrying at least one LED 3. The light source is fixed on an opaque support 4 comprising at least one lighting opening 5. The lighting device then comprises a first diffusing element 6 adapted to reflect and diffuse the light in the direction of the lighting opening 5.

Le dispositif d'éclairage comprend, au niveau de l'ouverture un écran translucide formant le deuxième élément diffusant 7 adapté pour être traversé par la lumière diffusée par le premier élément diffusant 6 et pour diffuser ladite lumière.The lighting device comprises, at the level of the opening, a translucent screen forming the second diffusing element 7 adapted to be traversed by the light diffused by the first diffusing element 6 and to diffuse said light.

Le dispositif d'éclairage comprend également un troisième élément diffusant 8 contribue à son tour à la diffusion de la lumière qui le traverse.The lighting device also comprises a third diffusing element 8 which in turn contributes to the diffusion of the light passing through it.

Ainsi la combinaison des trois éléments diffusants 6, 7, 8, le premier travaillant en réflexion, les deux autres en transmission, produit ainsi l'émission vers l'extérieur, sur la face frontale ou avant du feu concerné, d'un éclairage homogénéisé, dont la source n'est pas ou très peu visible de l'observateur. La lumière n'est alors pas perçue par l'observateur comme issue d'une juxtaposition de sources ponctuelles intenses mais comme provenant d'une unique source diffuse sans point chaud ce qui réduit l'éblouissement de l'observateur lorsqu'il est proche du feu.Thus the combination of the three diffusing elements 6, 7, 8, the first working in reflection, the other two in transmission, thus produces the emission towards the outside, on the frontal or front face of the light concerned, of a homogenized lighting , whose source is not or very little visible to the observer. The light is then not perceived by the observer as coming from a juxtaposition of intense point sources but as coming from a single diffuse source without a hot spot, which reduces the glare of the observer when he is close to the fire.

Selon l'exemple illustré, les faces avant et arrière du troisième élément diffusant 8 sont munies de grainage 11.According to the example illustrated, the front and rear faces of the third diffusing element 8 are provided with graining 11.

Par ailleurs, dans le cas présent, la face arrière par rapport au PCB 2 portant la LED 3 de la partie 10 de l'élément 8 est avantageusement munie d'un élément opaque, sous forme du support opaque 4, 4 occulte les parties diffusantes en regard, donc autres que celles dédiées au troisième élément diffusant 8, aux yeux de l'observateur. Cet élément d'occultation peut en pratique être profilé et métallisé à convenance, et jouer ainsi un rôle de cache vis-à-vis des rayons lumineux autres que ceux que le troisième élément diffusant reçoit et diffuse.Furthermore, in the present case, the rear face relative to the PCB 2 carrying the LED 3 of the part 10 of the element 8 is advantageously provided with an opaque element, in the form of the opaque support 4, 4 conceals the diffusing parts opposite, therefore other than those dedicated to the third diffusing element 8, in the eyes of the observer. This concealment element can in practice be profiled and metallized suitably, and thus act as a shield vis-à-vis the light rays other than those that the third diffusing element receives and diffuses.

Pour plus d'homogénéité, un meilleur rendu de l'éclairage et une bonne évacuation de la chaleur émise par les LEDs, le PCB 2 support des LEDs est écarté du plan de la partie du troisième élément diffusant située hors de l'épargne ou ouverture susdite, tandis que l'ensemble PCB + LEDs est entouré d'un support ne comportant qu'une ouverture choisie ou ajustable à convenance en regard des LED.For more homogeneity, better rendering of the lighting and good evacuation of the heat emitted by the LEDs, the PCB 2 supporting the LEDs is moved away from the plane of the part of the third diffusing element located outside the savings or opening aforesaid, while the PCB+LEDs assembly is surrounded by a support having only one chosen or adjustable opening at convenience next to the LEDs.

Selon les exemples illustrés Fig 1 à Fig.3, le support opaque 4, 9 est situé, à convenance, sur la face arrière ou sur la face avant d'une portion 10 du troisième élément diffusant débordant de l'ouverture, le PCB est alors fixé sur cette portion du troisième élément diffusant.According to the examples shown Fig 1 to Fig.3 , the opaque support 4, 9 is located, as appropriate, on the rear face or on the front face of a portion 10 of the third diffusing element projecting from the opening, the PCB is then fixed on this portion of the third diffusing element.

Dans la forme de réalisation représentée sur la Fig. 1, le matériau du deuxième élément diffusant 7 est doublé, de préférence par surmoulage, par ladite partie débordante du troisième élément diffusant 8.In the embodiment shown in the Fig. 1 , the material of the second diffusing element 7 is doubled, preferably by overmoulding, by said projecting part of the third diffusing element 8.

En pratique, pour un bon rendu de l'intensité lumineuse jusqu'à la sortie du boîtier du feu concerné, le premier élément diffusant est réalisé en PC [polycarbonate] blanc opalin.In practice, for good rendering of the light intensity up to the output of the light housing concerned, the first diffusing element is made of opal white PC [polycarbonate].

Les deuxième et troisième élément diffusants 7, 8 sont de préférence réalisés en PMMA [polyméthacrylate de méthyle] ou en PC [polycarbonate], avec au moins une surface extérieure irrégulière de préférence grainée, sablée ou brossée. Le matériau constitutif des deuxième et troisième éléments diffusants peut également être chargé en particules microscopiques de dimensions supérieures au micron de manière à augmenter le pouvoir diffusant des dits éléments.The second and third diffusing elements 7, 8 are preferably made of PMMA [polymethyl methacrylate] or PC [polycarbonate], with at least one irregular outer surface, preferably grained, sandblasted or brushed. The constituent material of the second and third diffusing elements can also be loaded with microscopic particles of dimensions greater than one micron so as to increase the diffusing power of said elements.

Selon l'exemple de réalisation illustré figure 1, le boîtier 1 est fermé par un voyant ou vitre 12.According to the illustrated embodiment figure 1 , the case 1 is closed by an indicator or window 12.

La Fig. 2 montre une autre forme de réalisation qui diffère de celle de la Fig. 1 en ce que le support opaque 4, 9 est plan et appliqué contre la face libre du troisième élément diffusant 10 qui est lui-même avantageusement formé en surmoulage avec le deuxième élément diffusant 7;There Fig. 2 shows another embodiment which differs from that of the Fig. 1 in that the opaque support 4, 9 is flat and applied against the free face of the third diffusing element 10 which is itself advantageously formed by overmoulding with the second diffusing element 7;

Selon la forme de réalisation représentée à la Fig. 3, l'élément 4 ou 9 opaque est intégré dans le feu en avant du deuxième élément diffusant 7 et libère ainsi sa surface opposée sur laquelle est appliqué le troisième élément diffusant 8 qui peut alors constituer à lui seul le voyant 12 du feu, dont le volume de diffusion défini par le profil de l'élément 8 déborde en saillie vers l'extérieur du feu.According to the embodiment shown in Fig. 3 , the opaque element 4 or 9 is integrated into the light in front of the second diffusing element 7 and thus releases its opposite surface on which is applied the third diffusing element 8 which can then constitute on its own the light 12 of the fire, whose diffusion volume defined by the profile of the element 8 overflows projecting outwards from the fire.

Cette forme de réalisation possède comme avantage de permettre de disposer d'un boîtier de feu d'éclairage et/ou de signalisation d'épaisseur réduite. En pratique, l'épaisseur maximale représentée par A sur la figure peut ainsi être comprise ente 20 mm et 30 mm. De plus, il est possible de faire varier à convenance également les cotes X et Y de l'espace enfermé par le troisième élément diffusant 8, selon des choix autant esthétiques que fonctionnels aisément applicables par l'homme du métier.This embodiment has the advantage of making it possible to have a lighting and/or signaling light housing of reduced thickness. In practice, the maximum thickness represented by A in the figure can thus be between 20 mm and 30 mm. In addition, it is possible to also vary the dimensions X and Y of the space enclosed by the third diffusing element 8 as desired, according to both aesthetic and functional choices that are easily applicable by those skilled in the art.

Dans la forme de réalisation illustrée à la Fig.3, il est préconisé de prévoir le grainage uniquement sur la face intérieure, mais pas sur la face extérieure du troisième élément diffusant qui est alors lisse.In the embodiment illustrated in Fig.3 , it is recommended to provide graining only on the inner face, but not on the outer face of the third diffusing element which is then smooth.

Le dispositif selon l'invention peut comporter d'autres caractéristiques pouvant être prises séparément ou dans n'importe laquelle de leurs combinaisons techniquement possibles, notamment:

  • le support 9 est constitué par un enjoliveur métalisable participant à l'aspect esthétique du pourtour du feu concerné.
  • un grainage peut être prévu sur la face externe (arrière) et/ou sur la face interne (avant) du troisième élément diffusant,
  • On préfère conférer ledit grainage à la face interne du troisième élément lorsque celui- ci se substitue au voyant du boîtier.
The device according to the invention may comprise other characteristics which may be taken separately or in any of their technically possible combinations, in particular:
  • the support 9 consists of a metallizable trim contributing to the aesthetic appearance of the perimeter of the light concerned.
  • a graining can be provided on the external face (rear) and/or on the internal face (front) of the third diffusing element,
  • It is preferred to confer said graining on the internal face of the third element when the latter replaces the sight glass of the case.

Le dispositif selon l'invention est principalement destiné à équiper, avec la source d'énergie et la connectique appropriées, des systèmes d'éclairage formant lanterne, feu de stop, feu de stop surélevé, clignotant et/ou éventuellement feu diurne avant de véhicules automobiles.The device according to the invention is mainly intended to equip, with the appropriate energy source and connectors, lighting systems forming a lantern, brake light, raised brake light, flashing light and/or optionally front daytime running light of vehicles automobiles.

Claims (14)

  1. A lighting device for a vehicle lighting and/or signalling lamp, in particular for rear lamps, characterized in that it includes in a casing (1):
    - at least one LED light source (3), fastened to an opaque support (4, 9) including a lighting aperture (5) for the passage of the light to be diffused indirectly towards the observer,
    - a first opaque diffusing element (6) located upstream from the lighting aperture and adapted to reflect and diffuse the light coming from the light source towards the aperture,
    - a second translucent diffusing element (7) located downstream from the first diffusing element facing the lighting aperture (5) and intended to transmit and diffuse the light reflected and diffused by the first diffusing element,
    - a third translucent diffusing element (8) located downstream from the second diffusing element (7) and adapted to transmit and diffuse the light coming from the second diffusing element towards the outside of the concerned lamp, said third diffusing element contributing to the geometry of the lamp at the lighted state and defining a diffusion volume by its profile projecting outwards from the lamp at the lighting aperture (5).
  2. The lighting device according to the preceding claim, characterized in that the first diffusing element is of white colour.
  3. The lighting device according to one of the preceding claims, characterized in that the reflective surface of the first diffusing element has an irregular state of surface.
  4. The lighting device according to one of the preceding claims, characterized in that the first diffusing element is made of a material filled with particles of dimensions greater than or equal to one micron and/or comprising inclusions of dimensions greater than or equal to one micron.
  5. The lighting device according to one of the preceding claims, characterized in that the front surface and/or the rear surface of the second element has an irregular state of surface.
  6. The lighting device according to one of the preceding claims, characterized in that the second diffusing element is made of a material filled with particles of dimensions greater than or equal to one micron and/or comprising inclusions of dimensions greater than or equal to one micron.
  7. The lighting device according to one of the preceding claims, characterized in that the front surface and/or the rear surface of the third element has an irregular state of surface.
  8. The lighting device according to one of the preceding claims, characterized in that the third diffusing element is made of a material filled with particles of dimensions greater than or equal to one micron and/or comprising inclusions of dimensions greater than or equal to one micron.
  9. The lighting device according to one of the preceding claims, characterized in that it comprises a transparent and/or translucent sight glass (12) adapted to close the casing.
  10. The lighting device according to one of the preceding claims, characterized in that the third diffusing element (8) is adapted to close the casing.
  11. The lighting device according to claim 9, characterized in that the third diffusing element (8) has a smooth rear surface.
  12. The lighting device according to one of the preceding claims, characterized in that the opaque support (4, 9) is located on the rear face or the front face of a portion of the third diffusing element offset with respect to the lighting aperture that carries the light source.
  13. The lighting device according to claim 11, characterized in that the second diffusing element (7) is lined, preferably by overmoulding, by the offset portion of the third diffusion element (8).
  14. The lighting device according to one of the preceding claims, characterized in that the second diffusing element carries the opaque support that partly hides it.
EP14790119.3A 2013-06-28 2014-06-30 Indirect lighting device for a motor vehicle tail light Active EP3014172B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1301537A FR3007821B1 (en) 2013-06-28 2013-06-28 INDIRECT LIGHTING DEVICE FOR REAR LIGHT OF MOTOR VEHICLE
PCT/FR2014/051676 WO2014207414A2 (en) 2013-06-28 2014-06-30 Indirect lighting device for a motor vehicle tail light

Publications (2)

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EP3014172A2 EP3014172A2 (en) 2016-05-04
EP3014172B1 true EP3014172B1 (en) 2023-07-12

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EP (1) EP3014172B1 (en)
JP (1) JP2016526768A (en)
CN (1) CN105492824B (en)
FR (1) FR3007821B1 (en)
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WO (1) WO2014207414A2 (en)

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Publication number Publication date
CN105492824B (en) 2019-07-30
PL3014172T3 (en) 2023-12-11
JP2016526768A (en) 2016-09-05
FR3007821A1 (en) 2015-01-02
FR3007821B1 (en) 2018-04-20
WO2014207414A2 (en) 2014-12-31
EP3014172A2 (en) 2016-05-04
CN105492824A (en) 2016-04-13
WO2014207414A3 (en) 2015-04-16

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