FR3025863A1 - LUMINOUS MODULE COMPRISING A MULTI-SOURCE OPTICAL LENS - Google Patents

Abstract

The invention relates to a light module comprising at least one light source (50), a radiator (3) and a piece (7) of transparent material, comprising at least two portions (16, 17, 18, 19, 20). each of an input surface (21, 22, 23, 24, 25) and an output surface (26, 27, 28, 29, 30), the output surfaces (26, 27, 28) , 29, 30) being joined together to form an overall exit surface of said workpiece (7) which is continuous, and the input surfaces (21, 22, 23, 24, 25) being at a distance from each other. the other. Such a light module has the particularity of having at least one fixing lug (5, 6, 8) intended to directly mount said piece (7) transparent on said radiator (3).

Description

The invention relates to a light module comprising a multi-source optical lens. Light modules for mounting in vehicle projectors exist and have already been patented. It is possible, for example, to quote the patent application US2007 / 0120137 which relates to a multi-source light module, comprising a multiplicity of unitary and distinct assemblies. Each assembly comprises a light source which is mounted on a substrate providing current to said source, and a lens associated with said source. A major part of the light emitted by this light source is transmitted to an exit diopter of the lens, via a pipe whose cross section progressively increases from said source to said exit diopter. The exit diopter has a D-shape and makes it possible to transmit the light beams coming from the light source, in the same direction. The light module described in this document is modular, because it can consist of a variable number of unit assemblies, depending on the lighting requirements encountered. Such a light module, however, has the disadvantage of being difficult to implement, because of the large number of parts involved. Indeed, the presence of several unitary assemblies and therefore of several separate lenses, requires a certain complexity of assembly, and generates additional costs related in particular to the multiplicity of lenses to be manufactured. A light module according to the invention implements a lens and several light sources able to provide modular lighting, while remaining easy and quick to assemble. The invention firstly relates to a light module comprising at least one light source, a radiator and a piece of transparent material, comprising at least two elementary portions each consisting of an entrance surface and an exit surface, the exit surfaces being joined to form an overall exit surface of said part which is continuous, and the entrance surfaces being at a distance from each other, said transparent part having at least one leg of fixing intended to directly mount said transparent part on said radiator. In this way, each fastening tab is intended to come into contact with the radiator to ensure direct stowage of the transparent part on said radiator. It is therefore no longer necessary to interpose an interface piece between the transparent part and the radiator to ensure a fastening of said part to said radiator. The term "bracket" is a general term for any means for securing two objects together. Each fixing lug may constitute either an insert which is secured to the piece of transparent material, or an extension of said transparent piece forming with it a single resultant piece. The transparent part serves as a lens within the light module, to produce a specific and modular light beam in collaboration with each light source of the light module. It is assumed that each light source is arranged in the light module so that the beams emitted by said source first illuminate each input surface, and then the output surface associated therewith. Preferably, the piece of transparent material 20 comprises five aligned elementary portions, thus defining two end elementary portions framing three intermediate elementary portions. Advantageously, within each elementary portion, the output surface is focused at the input surface. Advantageously, said at least two elementary portions are aligned along a longitudinal axis of the part and make it possible to define two end portions, said part having two fixing lugs each disposed at an end portion. Preferably, the two fastening tabs extend laterally with respect to the longitudinal axis of the part.

Preferably, the part has a third fixing lug disposed in a central zone of said part, the two end fixing lugs extending on one side of the longitudinal axis of the part and the central fixing lug. extending on the other side of said longitudinal axis. Advantageously, each fixing lug has a fixing member intended to cooperate with a fixing means of the radiator. For example, each bracket has an orifice to be matched with a radiator port for the passage of a fixing screw. According to another embodiment, each fixing lug has an orifice intended to receive a fixing pin of the radiator, said pin being able for example subsequently to be riveted. According to another embodiment, each fixing lug has a pin intended to be introduced into an orifice of the radiator, said pin being able for example to be subsequently riveted. Advantageously, at least one fixing lug comprises a secondary member intended to cooperate with a secondary means of the radiator, so as to ensure the prepositioning of the part on said radiator. For example, each fixing lug has a secondary orifice intended to cooperate with a relief of the radiator. These secondary orifices may be blind or completely cross the bracket. The transparent piece is thus brought into contact with a wall of the radiator, and is then correctly positioned on said radiator by virtue of its secondary orifices which interact with reliefs projecting from the radiator, before being definitively fixed on the radiator. According to another embodiment, each fixing lug comprises a relief intended to cooperate with a secondary orifice of the radiator.

Preferably, the fastening tabs are made of the same material as that of the transparent part, said tabs and said part constituting a single piece. Advantageously, the material may be polymethyl methacrylate (PMMA) or polycarbonate (PC). The single piece can be made by molding in one piece, or by overmolding 30 of said fastening tabs on the transparent part.

According to another preferred embodiment of a light device according to the invention, the fastening tabs are made of a material different from that of the transparent piece, said tabs and said piece constituting a single piece. Advantageously, the material constituting the fixing lugs is a material at least as rigid as that of the transparent part. For example, the material of the transparent part may be polymethyl methacrylate (PMMA), and that of the fastening lugs of polycarbonate (PC). Preferably, the single piece is made by overmolding said fastening tabs on the transparent piece.

Advantageously, the entrance surfaces are separated by means able to prevent rays originating from a light source placed at the inlet surface of a portion from passing through the exit surface of the portion. adjacent elementary. Advantageously, the means are constituted by walls originating at each entrance surface and extending towards the corresponding exit surface. These walls are arranged to reflect the light beams coming from the input surfaces, and not to transmit them to the output surfaces of the adjacent elementary portions. Advantageously, each wall extends towards an edge delimiting the exit surface. Preferably, the elementary portions are aligned, the two input surfaces of the two elementary end portions being bordered by a single wall, and the input surfaces of the other elementary portions being each bordered by two walls. Indeed, each of the two elementary end portions has a single wall to prevent beams from its input surface, to pass through the exit surface of the single adjacent elementary portion. The other elementary portions being flanked by two adjacent elementary portions, therefore require two walls to prevent the beams coming from their input surfaces from passing through the exit surface of said two adjacent elementary portions. Preferably, each wall has a curved profile. Indeed, the walls are not rigorously flat. This is a low-amplitude curvature, not affecting the overall expansion direction of said wall. Advantageously, the part has several recesses delimited each by a wall of an elementary portion and a wall of the adjacent elementary portion. In this way, said part has an optimized geometry so that its weight and its size are as small as possible. Advantageously, each hollow has a rounded bottom. In other words, the two walls of the two adjacent elementary portions delimiting a hollow, meet by means of a curved segment. Preferably, the walls are aluminized. In this way, each of said walls can effectively reflect light beams from the input surface to converge them to the output surface of the same elemental portion. Advantageously, a light module according to the invention comprises at least two light sources illuminating the input surfaces of two adjacent elementary portions, the beams coming from an input surface being able to pass only through the exit surface of the same elementary portion, the separation means preventing said beams from passing through the exit surface of the adjacent elementary portion. In this way, such a light module makes it possible to emit a resulting light beam, coming from the exit surfaces, having several components each coming from an elementary portion of the piece of transparent material, said beam being devoid of any spurious signal. due to light interferences between said elementary portions.

Advantageously, each light source is constituted by a light-emitting semiconductor chip. For example, the semiconductor light-emitting chip may consist of a light-emitting diode. Such a diode provides good light beam quality while remaining small in size. It is therefore perfectly adapted to a light module according to the invention, whose dimensions must be limited to be, for example, incorporated in a motor vehicle. Preferably, the light source is mounted directly on the radiator, for example by gluing the light source directly onto a surface of the radiator. Advantageously, the light module may comprise a control unit of the light source, for example mounted on the radiator or alternatively remote from the radiator. If desired, the control unit is electrically connected to the light source by bridging with a wire. The subject of the invention is a vehicle headlamp comprising at least one light module according to the invention. The third object of the invention is a piece of transparent material for producing a light module according to the invention.

A light module according to the invention has the advantage of implementing a single piece of transparent material, and intended to be used with several light sources, to fulfill a specific lighting or signaling function. Since the transparent part has a compact geometry, said module has the advantage of being compact. It also has the advantage of generating moderate costs, avoiding having to manufacture several lenses, each dedicated to a particular lighting and / or signaling function. It also has the advantage of being able to produce a great variability of light beams according to the number and location of the associated light sources, to meet different needs and requirements in terms of lighting. A light module according to the invention finally has the advantage of being of simple design, the piece of transparent material being fixed directly to the radiator without the intermediary of an additional interface piece. The following is a detailed description of a preferred embodiment of a piece of transparent material according to the invention, and of a light module using such a part, with reference to FIGS. 1 to 6. FIG. 1 is a schematic view from above of a projector according to the invention using at least one light module according to the invention; FIG. 2 is an enlarged view from above of a light module according to the invention of FIG. FIG. 3 is a side view of a piece of transparent material according to the invention; FIG. 4 is a 90 ° view of the part of FIG. 3; FIG. FIG. 6 is a perspective view from another angle of the part of FIG. 5. Referring to FIG. 1 a vehicle front projector 1 according to the invention, comprises at least one light module 2 according to the invention for illuminating an area before AV of the vehicle or providing a signaling function of said vehicle. Referring to FIG. 2, each light module 2 comprises a part 7 made of transparent material and a radiator 3, said transparent part 7 being directly secured to a wall 4 of said radiator 3 by means of fastening tabs 5, 6, 8 openwork and screws 9, 10.

It should be noted that Figures 3 and 4 illustrate only the functional part of the transparent part 7, the fixing lugs 5, 6, 8 not being visible in these two figures; Thus, with reference to FIGS. 3 and 4, the piece 7 made of transparent material according to the invention is solid and is made of PVC (polyvinyl chloride), and plays the role of an optical lens within the light module. This piece schematically comprises a central body 13, bordered by two arms 14, 15 of parallel end and extending in a direction which is perpendicular to a longitudinal axis of said piece 7. The body 13 of this piece 7 is divided into five elementary portions 16, 17, 18, 19, 20 full, each characterized by an inlet surface 21, 22, 23, 24, 25 and an outlet surface 26, 27, 28, 29, 30. These five portions 16, 17, 18, 19, 20 are substantially aligned along a longitudinal axis of the part 7. This transparent part 7 thus has two elementary end portions 16, 17, materialized by the two arms 14, 15 end , and three intermediate elementary portions 18, 19, 20 positioned between said end portions 16, 17. The five exit surfaces 26, 27, 28, 29, 30 are joined, to form an overall exit surface of said workpiece 7, which is continuous. These five exit surfaces 26, 27, 28, 29, 30 constitute the foremost part of the body 13. The five inlet surfaces 21, 22, 23, 24, 25 are separated from one another. Each portion 16, 17, 18, 19, 20 is elongated, the inlet surface 21, 22, 23, 24, 25 and the outlet surface 26, 27, 28, 29, 30 constituting the two ends of each of said portions. 16, 17, 18, 19, 20 along their longitudinal axis. The three intermediate elementary portions 18, 19, 20 each have two walls 31, 32, 33, 34, 35, 36 originating at the inlet surface 23, 24, 25 and extending towards two edges delimiting the outlet surface 28, 29, 30 of the same portion 18, 19, 20. These walls 31, 32, 33, 34, 35, 36, which may for example be aluminized, are intended to prevent the beams produced by a source 30 illuminated at an input surface 23, 24, 25 of a portion 18, 19, 20, to pass through the exit surface of an adjacent portion. The two elementary end portions 16, 17 have only one wall 37, 38 for preventing a light source placed at the entrance surface 21, 22, of one of them, irradiating an exit surface of an adjacent elementary portion, since each of said end portions 16, 17 has only one adjacent elementary portion. The walls 31, 32, 33, 34, 35, 36, 37, 38 of two adjacent elementary portions 16, 17, 18, 19, 20 meet by means of a curved wall segment. The transparent part 7 thus has a series of four recesses 39, 40, 41, 42 aligned in alternation with the five elementary portions 16, 17, 18, 19, 20, each recess being thus delimited by a wall of an elementary portion 10 and by a wall of an adjacent elementary portion. The two inlet surfaces 21, 22 of the two end elementary portions 16, 17 are set back from the input surfaces 23, 24, 25 of the three intermediate elementary portions 18, 19, 20. For each of the five elementary portions 16, 17, 18, 19, 20, the average distance between the inlet surface and the exit surface is substantially constant. The inlet surfaces 21, 22, 23, 24, 25 are parallel and the outlet surfaces 26, 27, 28, 29, 30 are rounded in shape. A light device according to the invention 2 according to the invention comprises five light-emitting diodes LED 50, fixed on a wall 4 of the radiator 3 20 so that each of the five LEDs 50 comes to be positioned at an input surface 21, 22, 23, 24, 25 of said piece 7. More precisely, the LEDs 50 are found outside the elementary portions 16, 17, 18, 19, 20 of the part 7, so that each LED 6 can sending light beams to the input surface 21, 22, 23, 24, 25 with which it is associated, said beams passing through said input surface 21, 22, 23, 24, 25 to then pass through the surface of outlet 26, 27, 28, 29, 30 of the same portion. Thus, the light beams coming from each input surface 21, 22, 23, 24, 25 may either directly reach the corresponding exit surface 26, 27, 28, 29, 30, or may be previously reflected on the walls 31. , 32, 33, 34, 35, 36, 37, 38 before reaching said outlet surface 26, 27, 28, 29, 30. The walls 31, 32, 33, 34, 35, 36, 37, 38 avoid that the light beams emitted by an LED 6 placed at an elementary portion 16, 3025863 10 17, 18, 19, 20, reach the exit surface 26, 27, 28, 29, 30 d an adjacent elementary portion 16, 17, 18, 19, 20. The elementary portions 16, 17, 18, 19, 20 act separately and autonomously, in order to obtain a resultant light beam, without parasitic interference. Referring to FIGS. 5 and 6, the piece of transparent material has three fastening tabs 5, 6 and 8, two of which 5, 6 of said tabs extend the two arms 14, 15 embodying the two elementary end portions 16, 17 and whose third tab 8 extends the three input surfaces 23, 24, 25 of the three intermediate elementary portions 18, 19, 20. In this way, a light device 2 according to the invention has two end tabs 5 , 6 each extending an arm 14, 15, and a central fixing lug 8 extending the three input surfaces 23, 24, 25 of the three intermediate portions 18, 19, 20. The three attachment lugs 5, 6, 8 are 15 flat and thin. They are, in addition, parallel and extend in a plane which is perpendicular to the longitudinal axis of the two arms 14, 15. In other words, the two end tabs 5, 6 extend parallel to the two surfaces of 21, 22 of the two elementary end portions 16, 17, and the central lug 8 extends parallel to the inlet surfaces 23, 24, 20 of the three intermediate elementary portions 18, 19, 20. The two legs end 5, 6 extend on one side of a longitudinal axis of the part 7, while the central leg 8 extends on the other side of said longitudinal axis. Each fixing lug 5, 6, 8 has a main orifice 51, 52, 53 positioned at one of its ends. This orifice 51, 52, 53 is intended to be matched with an orifice of a wall 4 of the radiator 3 to allow the passage of a fixing screw 9, 10. Each fixing lug 5, 6, 8 has in addition to a secondary orifice 54, 55, 56 adapted to cooperate with a relief projecting from the radiator 3, to ensure the prepositioning of the piece 7 of transparent material on said radiator 3, before proceeding to its final fixation on this latter by means of fixing screws 9, 10. These secondary orifices 54, 55, 56 are preferably blind holes. The three fixing lugs 5, 6, 8 are also made of PVC.

Advantageously, the piece 7 made of transparent material and the three fixing lugs 5, 6, 8 constitute one and the same piece produced by molding or overmolding. Referring to FIG. 2, the piece 7 made of transparent material of a light device 2 according to the invention is first pre-positioned directly on the wall 4 of the radiator 3 via its secondary orifices 54, 55 , 56. No interface piece is required to secure the piece 7 of transparent material on the radiator 3. Once this prepositioning has been carried out, the main orifices 51, 52, 53 of the fixing lugs 5 , 6 and 8 are found in correspondence with orifices of the wall 4 of the radiator 3. Three fastening screws 9, 10 are then introduced into these pairs of superposed orifices, in order to ensure the definitive fixing of the piece 7 of material directly transparent on the wall 4 of the radiator 3. Although the LEDs all have the same reference in the description, in this case the number 50, they can naturally have different structural, geometrical and luminous characteristics. within a same light module 1, said LEDs 50 being chosen according to the specific needs in terms of lighting.

Claims (15)

REVENDICATIONS1. Luminous module comprising at least one light source (50), a radiator (3) and a piece (7) made of transparent material, comprising at least two elementary portions (16, 17, 18, 19, 20) each consisting of a surface inlet (21, 22, 23, 24, 25) and an outlet surface (26, 27, 28, 29, 30), the exit surfaces (26, 27, 28, 29, 30) being joined so as to form an overall output surface of said piece (7) which is continuous, and the input surfaces (21, 22, 23, 24, 25) being at a distance from each other, said transparent piece (7) having at least one bracket (5, 6, 8) for directly mounting said piece (7) transparent on said radiator (3). 2. The light module according to claim 1, wherein said at least two elementary portions (16, 17, 18, 19, 20) are aligned along a longitudinal axis of the piece (7) and make it possible to define two end portions ( 16, 17), said piece (7) having two fastening tabs (5, 6) each disposed at an end portion (16, 17). 3. Light module according to claim 2, wherein the two fastening lugs (5, 6) extend laterally with respect to the longitudinal axis of the piece (7). 4. Light module according to any one of claims 2 or 3, wherein the piece (7) has a third tab (8) for fixing arranged in a central zone (23, 24, 25) of said piece (7), the two end fixing lugs (5, 6) extending on one side of the longitudinal axis of the workpiece (7) and the central fixing lug (8) extending on the other side of said axis longitudinal. 5. Light module according to any one of claims 1 to 4, wherein each bracket (5, 6, 8) has a securing member (51, 52, 53) for cooperating with a radiator fastening means (3). 3025863 13 6. Light module according to any one of claims 1 to 5 wherein at least one bracket (5, 6, 8) comprises a secondary member (54, 55, 56) for cooperating with a secondary means of the radiator ( 3), so as to ensure the prepositioning of the part 5 (7) on said radiator (3). The light module according to any one of claims 1 to 6, wherein the input surfaces (21, 22, 23, 24, 25) are separated by means (31, 32, 33, 34, 35, 36 , 37, 38) adapted to prevent rays from a light source placed at the input surface (21, 22, 23, 24, 25) of a portion (16, 17, 18, 19 , 20) can pass through the exit surface (26, 27, 28, 29, 30) of the adjacent elementary portion (16, 17, 18, 19, 20). 8. The light module according to claim 7 wherein the means are constituted by walls (31, 32, 33, 34, 35, 36, 37, 38) originating at each input surface (21, 22, 23, 24, 25) and extending to the corresponding exit surface (26, 27, 28, 29, 30). The light module of claim 8 wherein each wall (31, 32, 33, 34, 35, 36, 37, 38) extends to an edge defining the exit surface (26, 27, 28, 29, 30). 10. Light module according to any one of claim 8 or 9, wherein the portions (16, 17, 18, 19, 20) are elementary aligned, the two input surfaces (21, 22) of the two portions (16). , 17) being surrounded by a single wall (37, 38), and the input surfaces (23, 24, 25) of the other elementary portions (23, 24, 25) being each bordered by two walls (31, 32, 33, 34, 35, 36). 11.Luminaire module according to any one of claims 8 to 10, having several recesses (39, 40, 41, 42) each delimited by a wall (31, 32, 33, 34, 35, 36, 37, 38) d an elementary portion (16, 17, 18, 19, 20) and a wall (31, 32, 33, 34, 35, 36, 37, 38) of the adjacent elementary portion (16, 17, 18, 19). , 20). 12. Light module according to claim 7, comprising at least two light sources illuminating the input surfaces of two portions 18, 19, 20), the beams coming from an input surface (21, 22, 23, 24, 25) being able to pass only through the exit surface (26, 27, 28, 29, 30). of the same elementary portion (16, 17, 18, 19, 20), the separating means (31, 32, 33, 34, 35, 36, 37, 38) preventing said beams from passing through the exit surface ( 26, 27, 28, 29, 30) of the adjacent elementary portion (16, 17, 18, 19, 20). 13. Light module according to any one of claims 1 to 12, wherein each light source is constituted by a semiconductor chip (50) emitting light. 15 14. Piece (7) of transparent material for producing a light module according to any one of claims 1 to 13. Vehicle projector comprising at least one light module (1) according to any one of claims 1 to 13.