EP3853517B1 - Light system for a lighting and/or signalling device of a motor vehicle - Google Patents

Light system for a lighting and/or signalling device of a motor vehicle Download PDF

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Publication number
EP3853517B1
EP3853517B1 EP19766291.9A EP19766291A EP3853517B1 EP 3853517 B1 EP3853517 B1 EP 3853517B1 EP 19766291 A EP19766291 A EP 19766291A EP 3853517 B1 EP3853517 B1 EP 3853517B1
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EP
European Patent Office
Prior art keywords
optical element
light
optical
frame
source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19766291.9A
Other languages
German (de)
French (fr)
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EP3853517A1 (en
Inventor
Pierre Renaud
Benoit Delande
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
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Valeo Vision SAS
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Publication date
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Publication of EP3853517A1 publication Critical patent/EP3853517A1/en
Application granted granted Critical
Publication of EP3853517B1 publication Critical patent/EP3853517B1/en
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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
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/29—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
    • 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
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • 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/or signaling, in particular for motor vehicles. More particularly, the invention relates to a light module for a lighting and/or signaling device for a motor vehicle
  • Motor vehicles are equipped with headlights to illuminate the road in front of the vehicle so that the driver can see the road when the outside light is reduced, particularly at night.
  • a projector comprises a housing and a transparent glass for closing the housing.
  • a light module comprising a light source and an optical element is arranged in the housing. The light source emits light rays towards an entrance face of the optical element which shapes said light rays.
  • the optical module makes it possible to form, from the light rays emitted by the light source, a final light beam with a precise light distribution which is projected onto the road through the closing glass of the headlight.
  • the light source is correctly positioned relative to the entry face of the optical element so that the light rays emitted by the light source are directed towards the entry face of the optical element. optical element.
  • the entrance face must intercept a maximum of the light rays emitted by the light source. To do this, the light source must be positioned as close as possible to the entry face of the optical element, for example at a distance less than 0.4 mm.
  • the light sources are not damaged, it is important that there remains a space between the entry face of the the optical element and the light source. Indeed, if the entry face of the optical element came to touch the light source, the optical element and the light source would be damaged.
  • the documents FR 3 056 700 A1 , CN 107 525 005 A And US 2008/253144 A1 show such projectors.
  • the light source when the light source is turned on, it produces heat. Due to the proximity of the light source and the optical element, the heat produced by the light source heats the optical element. This then deforms, which modifies the distance between the light source and the entrance face of the optical element. The relative position of the light source and the entrance face of the optical element is thus modified. The light rays emitted by the light source then enter differently through the entrance face of the optical element, which leads to a modification of the final light beam.
  • the document EP2306077 describes light modules comprising a light source positioned on a base structure via a printed circuit and an optical element held via a support to the base structure, the support and the optical element being in the same material.
  • the light source when activated, it heats both the optical element and its support.
  • the deformation of the optical element is then compensated by the deformation of the support.
  • An aim of the invention is to provide an alternative solution of a light module making it possible to guarantee the position of the optical element relative to the light source and to guarantee positioning of the light source as close as possible to the face input of the optical element without coming into contact with the latter.
  • Another aim of the invention is to maintain a substantially constant distance between the light source and the entrance face of the optical element, independently of temperature variations.
  • a light module for a motor vehicle lighting and/or signaling device according to claim 1 is provided.
  • Direct contact means that the pad touches the source support. There is therefore no intermediate part between the pad and the source support.
  • the optical element is then referenced directly relative to the source support using said at least one pad.
  • indirect contact we mean that the pad comes into contact with an intermediate part which is in contact with the source support.
  • the optical element is then referenced relative to the source support by means of an intermediate part.
  • the light source can be positioned relative to the optical element.
  • the pad whether in direct or indirect contact with the source support, makes it possible to reference the optical element in relation to the source support and therefore in relation to the light source which is also positioned on the support. from source.
  • the pad makes it possible to control the distance between the optical part and the light source.
  • the light source can therefore be positioned as close as possible to the entry face of the optical element without coming into contact with the latter.
  • the invention also makes it possible to maintain a substantially constant distance between the light source and the entrance face of the optical element, independently of temperature variations. Indeed, as the optical element and the pad are made of the same material, they deform in the same way depending on temperature variations. As the plot serves as referencing, its deformation compensates for the deformation of the optical element, which ensures a constant distance between the entry face of the optical element and the light source.
  • the distance between the at least one light source and the entry face of the optical element is less than 0.4 mm, which allows the entry face to intercept the majority of the light rays. emitted by the light source.
  • the optical element comprises a plurality of pads, for example 2 pads, 3 pads or 4 pads.
  • the at least one pad is placed at the periphery of the input face of the optical element.
  • a single stud can be positioned all along the periphery.
  • several pads can be distributed along the periphery. They can be spaced regularly, that is to say the spaces between two successive pads are identical, or they can be spaced irregularly. They can also be distributed symmetrically on either side of an axis of symmetry of the input face of the optical element.
  • the optical element comprises a plurality of microlenses.
  • the optical element comprises a plurality of optical guides each comprising an entry face forming said entry face of the optical element.
  • the optical guides come from the optical element in the same direction as the pads.
  • the entry faces of the optical guides are thus arranged facing the source support.
  • the optical element comprises at least as many optical guides as light sources.
  • the number of light sources may be less than the number of optical guides. Certain optical guides are then not associated with any light source. Alternatively, the number of light sources can be equal to the number of optical guides, each optical guide is then associated with a light source.
  • Each of the light sources is associated with an optical guide.
  • the light source with which the optical guide is associated is arranged facing the entry face of the optical guide, so that light rays emitted by each of the light sources enter the optical element via the entry face of the optical guide with which it is associated.
  • the frame comprises a base by which it is in contact with said source support, and the orthogonal projection of the free end of at least one of the pads on a straight line perpendicular to the plane tangent to said base is located further upstream or at the same level in the direction of the base as the projection of the entry face of the optical guide which is located furthest downstream in this same direction among all the projections input faces of the optical guides.
  • the ends of the optical guides extend further in the direction of the base than the studs projected on a straight line perpendicular to the plane tangent to the base of the frame.
  • a spacer is in contact with the pad so as to guarantee a space between the entry face of the optical guides and the light sources.
  • the orthogonal projection of the element formed by the spacer and the pad with which it is associated on a straight line perpendicular to the plane tangent to the base is then located further downstream in the direction of the base than the projection of the entry face of the optical guide which is located furthest downstream in this same direction among all the projections of the entry faces of the optical guides.
  • the spacer is positioned on the source support, the pad bearing on the spacer.
  • the spacer is attached to the end of the stud.
  • the frame comprises a base by which it is in contact with said source support, and the orthogonal projection of the free end of at least one of the pads on a straight line perpendicular to the plane tangent to said base is located further downstream in the direction of the base than the projection of the entry face of the optical guide which is located furthest downstream in this same direction among all the projections of the entry faces optical guides.
  • the ends of the optical guides extend less far in the direction of the base than the studs, projecting on a straight line perpendicular to the plane tangent to the base of the frame.
  • the pads then make it possible to reference the optical element on the source support during assembly and make it possible to control the space between the entry face of the optical element and the light sources. They guarantee the maintenance of a space between the entrance face of the optical element and the light sources.
  • each pad before mounting the assembly formed by the optical element and the frame on the source support, each pad intersects the plane tangent to the base. Contact between the pads and the source support is thus ensured for temperatures ranging from -40°C to 25°C.
  • the light module includes an elastic junction between the optical element and the frame capable of deforming when mounting the assembly formed by the frame and the optical element on the source support.
  • the assembly formed by the optical element and the frame can thus be easily assembled on the source support.
  • the elastic junction is made of the same material as the optical element. This facilitates the manufacturing of the light module, a single material having to be injected to make the optical element and the elastic junction.
  • the optical element and the pads are made of an elastically deformable material.
  • the optical element and the pads can be made of silicone. This material has the advantage of offering good resistance to high temperatures, notably up to 150°C, commonly encountered in a environment of a motor vehicle lighting and/or signaling device.
  • the frame is made of a material that is less elastically deformable than the optical element and the pads. This makes it easier to handle and position the light guides in front of the light sources.
  • the frame is made of a material transparent to ultraviolet rays, in order to allow the frame to be fixed to the source support with an adhesive which crosslinks under the effect of ultraviolet radiation.
  • the frame can for example be made of polycarbonate (PC), polymethyl methacrylate (PMMA), polyurethane (PU) or polyetherimide (PEI).
  • PC polycarbonate
  • PMMA polymethyl methacrylate
  • PU polyurethane
  • PEI polyetherimide
  • the coefficient of expansion of the frame is much lower than the coefficient of expansion of the pads, which makes it possible to ensure contact between the pads and the source support in the event of a rise in temperature.
  • the pads come from the material of the optical element. They can thus be produced at the same time as the optical element. Alternatively, the pads are attached to the optical element. They are then produced separately then assembled with the optical element.
  • the optical element is molded onto the frame.
  • the source support is a printed circuit.
  • the light sources are light-emitting diodes also called LEDs for the English acronym “Light Emitting Diode”
  • the frame includes an interface for fixing the frame to the source support.
  • the framework may include one or more holes in which a screw can be positioned.
  • the fixing interface could also be formed by a shoulder of the frame or by a bonding groove on the frame.
  • FIG. 1 illustrates a light module 1 intended to equip a motor vehicle lighting or signaling device.
  • the light module 1 is capable of generating a forward light beam.
  • the light module comprises a source support 10 on which a plurality of light sources 14 are positioned.
  • the source support 10 shown here is formed by a printed circuit 10'.
  • the light sources 14, visible in particular at the Figure 3 are distributed in a lower row 12 and an upper row 13. Each row has thirteen light sources 14. The superposition of the two rows thus forms a matrix 15 of light sources 14.
  • the light sources are light-emitting diodes.
  • the matrix 15 of light sources 14 extends in a plane orthogonal to the longitudinal direction “L”.
  • the light sources 14 are carried by the front face of the source support 10.
  • the light sources 14 are likely to emit heat during their operation.
  • the source support 10 on which the light sources 14 are positioned is positioned on a heat sink 11.
  • the heat sink 11 comprising a plurality of fins 16 extending in the direction opposite to the source support 10 thus makes it possible to dissipate the heat emitted by light sources 14.
  • the light sources 14 emit light rays. These light rays must be shaped so that the optical module can project a light beam onto the road.
  • the optical module 1 has for this purpose an optical element 30 capable of receiving the light rays coming from the light sources 14.
  • the light sources 14 For the light rays to be correctly shaped, the light sources 14 must be positioned precisely relative to the optical element 30.
  • the position of the optical element relative to the source support is established via a frame 20.
  • the frame 20 makes it possible to hold the optical element 30.
  • the frame 20 is provided with a central hole around which the optical element 30 is overmolded.
  • the frame also has three orifices 21, 22, 23 in which a screw can be positioned so as to form a fixing interface between the frame 20 and the source support 10.
  • the frame 20 can then be fixed to the source support 30 by via screws not shown which are inserted into the orifices 21, 22, 23.
  • the fixing interface could also be formed by a shoulder of the frame 20 or by a bonding groove on the frame 20.
  • the frame 20 includes a base 200 through which it is in contact with the source support 10.
  • the optical element 30 comprises a front portion 30a visible at the figure 2 and a rear portion 30b visible at the Figure 4 .
  • the rear portion 30b is formed by a plurality of optical guides 33, 34.
  • the optical guides 33, 34 extend along a main longitudinal axis from an entry face 33a, 34a to a front end face 36a for exiting the light rays.
  • Each light guide is designed to guide the light rays entering through the entrance face 33a, 34a to the front end face 36a. All of the entry faces 33a, 34a of the optical guides 33, 34 thus form the entry face of the optical element 30 and each front end face 36a forms a secondary light source 36.
  • the rear portion 30b comprises at least as many optical guides 33, 34 as light sources 14.
  • the rear portion 30b comprises as many optical guides 33, 34 as the number of light sources 14 of the light module 1.
  • the rear portion 30b comprises a lower row 312 comprising thirteen optical guides 33 and an upper row 313 comprising thirteen optical guides 34.
  • Each optical guide 33 of the lower row 312 is associated with a light source 14 of the row lower 12 and each optical guide 34 of the upper row 313 is associated with a light source 14 of the upper row 13.
  • the light source 14 with which the optical guide 33, 34 is associated is arranged facing the input face 33a, 34a of the optical guide 33, 34.
  • the face input 33a, 34a of the associated optical guide 33, 34 then intercepts the light rays emitted by the light source 14 with which it is associated.
  • the optical element 30 could comprise a plurality of microlenses.
  • the entrance faces 33a, 34a of the light guides 33, 34 are arranged in a common plane which is parallel to the plane of the source support 10.
  • each face of entrance 33a, 34a of the optical guides 33, 34 is positioned opposite and close to an associated light source 14 so that the majority of the light rays emitted by each light source 14 enter the guide associated optics.
  • Each optical guide 33, 34 has a section adapted to produce an elementary light beam emerging from the desired shape to perform the function of the optical module equipping the lighting or signaling device.
  • the front end faces of the optical guides 33, 34 forming the secondary light sources 36 are arranged along a curved surface C.
  • the optical guides 33, 34 located towards the outside of the optical element 30 thus have a length greater than the optical guides 33, 34 located in the center of the optical element 30.
  • the front end faces of the optical guides 33, 34 could be arranged in a common plane.
  • the front end faces of the optical guides 33, 34 thus form a matrix of secondary light sources 36 which emit elementary light beams.
  • These elementary light beams are shaped by the front portion 30a of the optical element 30.
  • This front portion 30a makes it possible, for example, to spread the elementary light beams vertically and/or horizontally.
  • the front portion 30a has a common front end face 37 for exiting the light rays from the optical element 30.
  • the front portion 30a is integral with the optical guides 33, 34 so that the optical element 30 is a single-piece element.
  • the light module 1 also includes projection optics 41 arranged longitudinally at a distance in front of the optical element 30.
  • the projection optics is capable of projecting the secondary light sources formed by the optical guides towards infinity to form the final light beam.
  • the projection optics comprises an object focal surface S.
  • This focal surface has a concave spherical curvature defect. This defect is called Petzval field aberration.
  • each secondary light source must be located on the focal surface object of the projection optics 41.
  • a field correction optics 40 is interposed between the optical element 30 and the projection lens 41.
  • This field correction optics 40 is designed to correct part of the field curvature aberration of the projection optics 41, the other part of the field curvature aberration of the projection optics 41 being corrected thanks to the curvature formed by the sources of secondary lights 36.
  • the field correction optics 40 is shaped so that the image of the object focal surface S curved by the field correction optics 41 extends in an object focal plane in coincidence with the curved emission surface C of the matrix of secondary light sources 36.
  • the rear portion 30b of the optical element 30 comprises four pads 350 having a free end projecting towards the source support 10.
  • the other end of the pads 350 is integral with the optical element 30.
  • the pads are thus produced monobloc with optical element 30.
  • the pads 350 are distributed along the periphery of the input face of the optical element 30.
  • the pads 350 are positioned symmetrically on either side of a transverse axis passing through the middle of the face d entrance of the optical element 30 and on either side of a vertical axis passing through the middle of the entrance face of the optical element 30.
  • each of the pads 350 has the same length. In a variant, it would be possible to have pads of different lengths.
  • the distribution of the pads 350 at the periphery of the input face of the optical element 30 makes it possible to distribute the support points of the optical element 30 on the source support 10. In fact, during assembly, the pads 350 come into direct or indirect contact with the source support 10.
  • the pads 350 come into indirect contact with the source support 10.
  • the orthogonal projection of the free end of the pads 350 on a straight line D perpendicular to the tangent plane Ta at the base 200 is located further upstream or at the same level in the direction of the base 200 as the projection of the entrance face of the optical guide which is located furthest downstream in this same direction among all the projections of the entrance faces 33a, 34a of the optical guides 33, 34.
  • the pads 350 are then further away from the source support 10 than the input faces 33a, 34a of the optical guides 33, 34.
  • the pads 350 each come into contact with a spacer 351 which is in contact with the source support 10.
  • the optical element 30 is then referenced relative to the source support 10 via the spacers 351.
  • the orthogonal projection of the element formed by a spacer 351 and the pad 350 with which it is associated on a straight line D perpendicular to the tangent plane Ta at the base 200 is then located further downstream in the direction of the base 200 than the projection of the entrance face of the optical guide which is located furthest downstream in this same direction among all the projections of the entrance faces 33a, 34a of the optical guides 33, 34.
  • the spacers 351 thus guarantee the maintenance of a space E between the light sources 14 and the entry faces 33a, 34a of associated optical guides 33, 34, while making it possible to minimize this space E so that a maximum of light rays from the light sources 14 enter through the entrance face 33a, 34a of the associated optical guide 33, 34.
  • This gap can for example be chosen to be less than 0.4 mm.
  • the spacers 351 can be positioned on the source support 10, each pad 350 then bearing on a spacer 351. Alternatively, the spacers 351 can be attached to the end of the pads 350. The assembly formed by the pads 350 and the spacers 351 make it possible to position the optical element relative to the source support 10. Thus, the light source 14 can be positioned as close as possible to the entrance face of the optical element without coming into contact with the latter.
  • the pads 350 come into direct contact with the source support 10.
  • the orthogonal projection of the free end of the pads 350 on a straight line D perpendicular to the tangent plane Ta at the base 200 of the frame 20 is located further downstream in the direction of the base 200 than the projection of the entry face of the guide optical which is located furthest downstream in this same direction among all the projections of the input faces 33a, 34a of the optical guides 33, 34.
  • the pads 350 are then closer to the source support 10 than the input faces 33a, 34a of the optical guides 33, 34.
  • the pads 350 come into contact with the source support 10 and then allow a space to be maintained between the entry face 33a, 34a of the optical guides and the source support 10.
  • the distance between the source support 10 and the entry faces of the optical guides is therefore controlled by the length of the pads 350.
  • the length of the pads 350 is calculated so that this space is greater than the height of the light sources 14 considered in orthogonal projection on this same straight line D perpendicular to the tangent plane Ta at the base 200.
  • a space E is guaranteed between the light sources 14 which are positioned on the source support 10 and the input faces 33a, 34a of the associated optical guides 33, 34.
  • This space E is also such that a maximum of the light rays coming from the light sources 14 enter through the entrance face 33a, 34a of the associated optical guide 33, 34.
  • This gap can for example be chosen to be less than 0.4 mm.
  • each pad 350 intersects the tangent plane Ta at the base 200 of the frame 20, before mounting the assembly formed by the optical element 30 and the frame 20 on the support from source 10. This is particularly visible in the Figure 7 .
  • the light module 1 comprises an elastic junction 24 between the optical element 30 and the frame 20 capable of deforming when mounting the assembly formed by the frame 20 and the optical element 30 on the source support 10. This elastic junction 24 then makes it possible to position the element formed by the frame 20 and the optical element 30 on the source support 10 without deforming the optical element 30, and in particular without damaging the optical guides 33, 34.
  • pads 350 would have different lengths, it would be possible to combine the two embodiments so that certain pads 350 are in indirect contact with the source support, via a spacer and other pads 350 are in direct contact with the source support.
  • the pads 350 are made of the same material as the optical element 10.
  • the optical element 30 and the pads 350 deform in the same way depending on temperature variations.
  • the deformation of the optical element 30 is therefore compensated by the deformation of the pads 350.
  • a substantially constant distance can be maintained between the entry face of the optical element 30 and the light sources 14, independently of variations in temperatures.
  • the optical element 30 and the pads 350 are made of an elastically deformable material, for example silicone.
  • elastically deformable means that the material deforms without breaking when it is subjected to a constraint force. It is therefore flexible.
  • the elastic junction 24 is advantageously made of the same material as the optical element 30 and the pads 350.
  • the optical element 30, the pads 350 and the elastic junction 24 undergo the same deformation, which contributes to maintaining the distance between the light sources 14 and the input faces 33a, 34a of the optical guides 33, 34 substantially constant.
  • the frame 20 is made of a less elastically deformable material than the optical element and the pads, and thus makes it possible to ensure good fixing of the element formed by the frame 20 and the optical element 30 to the source support 10 and to facilitate the positioning of the optical guides 33, 34 opposite the light sources 14.
  • the coefficient of expansion of the frame 20 is much lower than the coefficient of expansion of the pads 350.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

L'invention concerne le domaine de l'éclairage et/ou de signalisation, notamment pour véhicules automobiles. Plus particulièrement, l'invention concerne un module lumineux de dispositif d'éclairage et/ou de signalisation de véhicule automobile
Les véhicules automobiles sont équipés de projecteurs permettant d'éclairer la route à l'avant du véhicule de sorte à ce que le conducteur puisse voir la route lorsque la luminosité extérieure est réduite, notamment la nuit. Un projecteur comporte un boitier et une glace transparente de fermeture du boitier. Un module lumineux comportant une source de lumière et un élément optique est disposé dans le boitier. La source de lumière émet des rayons lumineux en direction d'une face d'entrée de l'élément optique qui met en forme lesdits rayons lumineux. Le module optique permet de former, à partir des rayons lumineux émis par la source de lumière, un faisceau lumineux final avec une distribution lumineuse précise qui est projetée sur la route à travers la glace de fermeture du projecteur.The invention relates to the field of lighting and/or signaling, in particular for motor vehicles. More particularly, the invention relates to a light module for a lighting and/or signaling device for a motor vehicle
Motor vehicles are equipped with headlights to illuminate the road in front of the vehicle so that the driver can see the road when the outside light is reduced, particularly at night. A projector comprises a housing and a transparent glass for closing the housing. A light module comprising a light source and an optical element is arranged in the housing. The light source emits light rays towards an entrance face of the optical element which shapes said light rays. The optical module makes it possible to form, from the light rays emitted by the light source, a final light beam with a precise light distribution which is projected onto the road through the closing glass of the headlight.

Il est important que la distribution lumineuse du faisceau lumineux final soit maitrisée. Elle doit notamment être conforme à la réglementation en vigueur et elle ne doit pas éblouir les différents usagers de la route, comme les conducteurs des véhicules croisés ou suivis.It is important that the light distribution of the final light beam is controlled. In particular, it must comply with the regulations in force and it must not dazzle various road users, such as the drivers of vehicles being passed or followed.

Il est donc essentiel que la source de lumière soit correctement positionnée par rapport à la face d'entrée de l'élément optique de sorte à ce que les rayons lumineux émis par la source de lumière soient dirigés vers la face d'entrée de l'élément optique. De plus, pour permettre une bonne efficacité du module lumineux, la face d'entrée doit intercepter un maximum des rayons lumineux émis par la source de lumière. Pour cela, la source de lumière doit être positionnée au plus proche de la face d'entrée de l'élément optique, par exemple à une distance inférieure à 0,4 mm. Toutefois, pour que les sources de lumière ne soient pas détériorées, il est important qu'il reste un espace entre la face d'entrée de l'élément optique et la source de lumière. En effet, si la face d'entrée de l'élément optique venait toucher la source de lumière, l'élément optique et la source de lumière seraient endommagés. Les documents FR 3 056 700 A1 , CN 107 525 005 A et US 2008/253144 A1 montrent de tels projecteurs.It is therefore essential that the light source is correctly positioned relative to the entry face of the optical element so that the light rays emitted by the light source are directed towards the entry face of the optical element. optical element. In addition, to allow good efficiency of the light module, the entrance face must intercept a maximum of the light rays emitted by the light source. To do this, the light source must be positioned as close as possible to the entry face of the optical element, for example at a distance less than 0.4 mm. However, so that the light sources are not damaged, it is important that there remains a space between the entry face of the the optical element and the light source. Indeed, if the entry face of the optical element came to touch the light source, the optical element and the light source would be damaged. The documents FR 3 056 700 A1 , CN 107 525 005 A And US 2008/253144 A1 show such projectors.

De plus, lorsque la source de lumière est allumée, celle-ci produit de la chaleur. En raison de la proximité de la source de lumière et de l'élément optique, la chaleur produite par la source de lumière vient chauffer l'élément optique. Celui-ci se déforme alors, ce qui vient modifier la distance entre la source de lumière et la face d'entrée de l'élément optique. La position relative de la source de lumière et de la face d'entrée de l'élément optique est ainsi modifiée. Les rayons lumineux émis par la source de lumière entrent alors différemment par la face d'entrée de l'élément optique, ce qui entraine une modification du faisceau lumineux final.In addition, when the light source is turned on, it produces heat. Due to the proximity of the light source and the optical element, the heat produced by the light source heats the optical element. This then deforms, which modifies the distance between the light source and the entrance face of the optical element. The relative position of the light source and the entrance face of the optical element is thus modified. The light rays emitted by the light source then enter differently through the entrance face of the optical element, which leads to a modification of the final light beam.

Le document EP2306077 décrit des modules lumineux comportant une source de lumière positionnée sur une structure de base par l'intermédiaire d'un circuit imprimé et un élément optique maintenu par l'intermédiaire d'un support à la structure de base, le support et l'élément optique étant dans le même matériau. Ainsi, lorsque la source de lumière est activée, elle chauffe à la fois l'élément optique et son support. La déformation de l'élément optique est alors compensée par la déformation du support.The document EP2306077 describes light modules comprising a light source positioned on a base structure via a printed circuit and an optical element held via a support to the base structure, the support and the optical element being in the same material. Thus, when the light source is activated, it heats both the optical element and its support. The deformation of the optical element is then compensated by the deformation of the support.

Un but de l'invention est de fournir une solution alternative d'un module lumineux permettant de garantir la position de l'élément optique par rapport à la source de lumière et de garantir un positionnement de la source de lumière au plus proche de la face d'entrée de l'élément optique sans entrer en contact avec cette dernière. Un autre but de l'invention est de maintenir une distance sensiblement constante entre la source de lumière et la face d'entrée de l'élément optique, indépendamment des variations de températures.An aim of the invention is to provide an alternative solution of a light module making it possible to guarantee the position of the optical element relative to the light source and to guarantee positioning of the light source as close as possible to the face input of the optical element without coming into contact with the latter. Another aim of the invention is to maintain a substantially constant distance between the light source and the entrance face of the optical element, independently of temperature variations.

A cet effet, on prévoit selon l'invention un module lumineux de dispositif d'éclairage et/ou de signalisation de véhicule automobile selon la revendication 1.For this purpose, according to the invention, a light module for a motor vehicle lighting and/or signaling device according to claim 1 is provided.

On entend par contact direct que le plot vient toucher le support de source. Il n'y a donc aucune pièce intermédiaire entre le plot et le support de source. L'élément optique est alors référencé directement par rapport au support de source grâce audit au moins un plot.Direct contact means that the pad touches the source support. There is therefore no intermediate part between the pad and the source support. The optical element is then referenced directly relative to the source support using said at least one pad.

On entend par contact indirect que le plot vient au contact d'une pièce intermédiaire qui est en contact avec le support de source. L'élément optique est alors référencé par rapport au support de source au moyen d'une pièce intermédiaire.By indirect contact we mean that the pad comes into contact with an intermediate part which is in contact with the source support. The optical element is then referenced relative to the source support by means of an intermediate part.

Ainsi, grâce à la présente invention, la source de lumière peut être positionnée par rapport à l'élément optique. En effet, le plot, qu'il soit en contact direct ou indirect avec le support de source, permet de référencer l'élément optique par rapport au support de source et donc par rapport à la source de lumière qui est également positionnée sur le support de source.Thus, thanks to the present invention, the light source can be positioned relative to the optical element. Indeed, the pad, whether in direct or indirect contact with the source support, makes it possible to reference the optical element in relation to the source support and therefore in relation to the light source which is also positioned on the support. from source.

De plus, le plot permet de contrôler la distance entre la pièce optique et la source de lumière. La source de lumière peut donc être positionnée au plus proche de la face d'entrée de l'élément optique sans entrer en contact avec cette dernière.In addition, the pad makes it possible to control the distance between the optical part and the light source. The light source can therefore be positioned as close as possible to the entry face of the optical element without coming into contact with the latter.

L'invention permet également de maintenir une distance sensiblement constante entre la source de lumière et la face d'entrée de l'élément optique, indépendamment des variations de températures. En effet, comme l'élément optique et le plot sont réalisés dans le même matériau, ils se déforment de la même façon en fonction des variations de température. Comme le plot sert de référencement, sa déformation vient compenser la déformation de l'élément optique, ce qui permet d'assurer une distance constante entre la face d'entrée de l'élément optique et la source de lumière.The invention also makes it possible to maintain a substantially constant distance between the light source and the entrance face of the optical element, independently of temperature variations. Indeed, as the optical element and the pad are made of the same material, they deform in the same way depending on temperature variations. As the plot serves as referencing, its deformation compensates for the deformation of the optical element, which ensures a constant distance between the entry face of the optical element and the light source.

Avantageusement, la distance entre la au moins une source de lumière et la face d'entrée de l'élément optique est inférieure à 0,4 mm, ce qui permet à la face d'entrée d'intercepter la plus grande partie des rayons lumineux émis par la source de lumière.Advantageously, the distance between the at least one light source and the entry face of the optical element is less than 0.4 mm, which allows the entry face to intercept the majority of the light rays. emitted by the light source.

Avantageusement, l'élément optique comporte une pluralité de plots, par exemple 2 plots, 3 plots ou 4 plots.Advantageously, the optical element comprises a plurality of pads, for example 2 pads, 3 pads or 4 pads.

Avantageusement, le au moins un plot est placé à la périphérie de la face d'entrée de l'élément optique.Advantageously, the at least one pad is placed at the periphery of the input face of the optical element.

Un unique plot peut être positionné tout le long de la périphérie. Alternativement, plusieurs plots peuvent être répartis le long de la périphérie. Ils peuvent être espacés régulièrement, c'est-à-dire que les espaces entre deux plots successifs sont identiques, ou ils peuvent être espacés irrégulièrement. Ils peuvent également être répartis de façon symétrique de part et d'autre d'un axe de symétrie de la face d'entrée de l'élément optique.A single stud can be positioned all along the periphery. Alternatively, several pads can be distributed along the periphery. They can be spaced regularly, that is to say the spaces between two successive pads are identical, or they can be spaced irregularly. They can also be distributed symmetrically on either side of an axis of symmetry of the input face of the optical element.

Avantageusement, l'élément optique comporte une pluralité de microlentilles.Advantageously, the optical element comprises a plurality of microlenses.

Selon l'invention, l'élément optique comporte une pluralité de guides optiques comportant chacun une face d'entrée formant ladite face d'entrée de l'élément optique. Les guides optiques sont issus de l'élément optique dans la même direction que les plots. Les faces d'entrée des guides optiques sont ainsi disposées en regard du support de source.According to the invention, the optical element comprises a plurality of optical guides each comprising an entry face forming said entry face of the optical element. The optical guides come from the optical element in the same direction as the pads. The entry faces of the optical guides are thus arranged facing the source support.

L'élément optique comporte au moins autant de guides optiques que de sources de lumière. Le nombre de sources de lumière peut être inférieur au nombre de guide optique. Certains guides optiques ne sont alors associés à aucune source de lumière. Alternativement, le nombre de sources de lumière peut être égal au nombre de guide optique, chaque guide optique est alors associé à une source de lumière.The optical element comprises at least as many optical guides as light sources. The number of light sources may be less than the number of optical guides. Certain optical guides are then not associated with any light source. Alternatively, the number of light sources can be equal to the number of optical guides, each optical guide is then associated with a light source.

Chacune des sources de lumière est associée à un guide optique. La source de lumière à laquelle est associée le guide optique est disposée en regard de la face d'entrée du guide optique, de sorte que des rayons lumineux émis par chacune des sources de lumière entrent dans l'élément optique par la face d'entrée du guide optique auquel elle est associée.Each of the light sources is associated with an optical guide. The light source with which the optical guide is associated is arranged facing the entry face of the optical guide, so that light rays emitted by each of the light sources enter the optical element via the entry face of the optical guide with which it is associated.

Selon un premier mode de réalisation qui sort du cadre de l'invention, le cadre comporte une base par laquelle il est en contact avec ledit support de source, et la projection orthogonale de l'extrémité libre d'au moins un des plots sur une droite perpendiculaire au plan tangent à ladite base est situé plus en amont ou au même niveau dans la direction de la base que la projection de la face d'entrée du guide optique qui est située la plus en aval selon cette même direction parmi toutes les projections des faces d'entrée des guides optiques. Autrement dit, les extrémités des guides optiques s'étendent plus loin dans la direction de la base que les plots en projection sur une droite perpendiculaire au plan tangent à la base du cadre.According to a first embodiment which goes beyond the scope of the invention, the frame comprises a base by which it is in contact with said source support, and the orthogonal projection of the free end of at least one of the pads on a straight line perpendicular to the plane tangent to said base is located further upstream or at the same level in the direction of the base as the projection of the entry face of the optical guide which is located furthest downstream in this same direction among all the projections input faces of the optical guides. In other words, the ends of the optical guides extend further in the direction of the base than the studs projected on a straight line perpendicular to the plane tangent to the base of the frame.

Avantageusement selon ce premier mode sortant du cadre de l'invention, un espaceur est en contact avec le plot de sorte à garantir un espace entre la face d'entrée des guides optiques et les sources de lumières. La projection orthogonale de l'élément formé par l'espaceur et le plot auquel il est associé sur une droite perpendiculaire au plan tangent à la base est alors située plus en aval dans la direction de la base que la projection de la face d'entrée du guide optique qui est située la plus en aval selon cette même direction parmi toutes les projections des faces d'entrée des guides optiques. L'espaceur permet ainsi de garantir le bon positionnement des sources de lumière par rapport à la face d'entrée de l'élément optique. Il permet de maîtriser l'espace entre la face d'entrée de l'élément optique et les sources de lumière et garanti ainsi le maintien d'un espace entre la face d'entrée de l'élément optique et les sources de lumière.Advantageously, according to this first mode falling outside the scope of the invention, a spacer is in contact with the pad so as to guarantee a space between the entry face of the optical guides and the light sources. The orthogonal projection of the element formed by the spacer and the pad with which it is associated on a straight line perpendicular to the plane tangent to the base is then located further downstream in the direction of the base than the projection of the entry face of the optical guide which is located furthest downstream in this same direction among all the projections of the entry faces of the optical guides. The spacer thus makes it possible to guarantee the correct positioning of the light sources relative to the entry face of the optical element. It makes it possible to control the space between the entry face of the optical element and the light sources and thus guarantees the maintenance of a space between the entry face of the optical element and the light sources.

Selon une première variante, l'espaceur est positionné sur le support de source, le plot prenant appui sur l'espaceur.According to a first variant, the spacer is positioned on the source support, the pad bearing on the spacer.

Selon une deuxième variante, l'espaceur est rapporté à l'extrémité de du plot.According to a second variant, the spacer is attached to the end of the stud.

Selon un deuxième mode de réalisation correspondant au cadre de l'invention, le cadre comporte une base par laquelle il est en contact avec ledit support de source, et la projection orthogonale de l'extrémité libre d'au moins un des plots sur une droite perpendiculaire au plan tangent à ladite base est situé plus en aval dans la direction de la base que la projection de la face d'entrée du guide optique qui est située la plus en aval selon cette même direction parmi toutes les projections des faces d'entrée des guides optiques. Autrement dit, les extrémités des guides optiques s'étendent moins loin dans la direction de la base que les plots, en projection sur une droite perpendiculaire au plan tangent à la base du cadre. Les plots permettent alors de référencer l'élément optique sur le support de source lors du montage et permettent de maîtriser l'espace entre la face d'entrée de l'élément optique et les sources de lumière. Ils garantissent le maintien d'un espace entre la face d'entrée de l'élément optique et les sources de lumière.According to a second embodiment corresponding to the framework of the invention, the frame comprises a base by which it is in contact with said source support, and the orthogonal projection of the free end of at least one of the pads on a straight line perpendicular to the plane tangent to said base is located further downstream in the direction of the base than the projection of the entry face of the optical guide which is located furthest downstream in this same direction among all the projections of the entry faces optical guides. In other words, the ends of the optical guides extend less far in the direction of the base than the studs, projecting on a straight line perpendicular to the plane tangent to the base of the frame. The pads then make it possible to reference the optical element on the source support during assembly and make it possible to control the space between the entry face of the optical element and the light sources. They guarantee the maintenance of a space between the entrance face of the optical element and the light sources.

Selon l'invention, avant le montage de l'ensemble formé par l'élément optique et le cadre sur le support de source, chaque plot est sécant au plan tangent à la base. Le contact entre les plots et le support de source est ainsi assuré pour des températures allant de -40°C à 25°C.According to the invention, before mounting the assembly formed by the optical element and the frame on the source support, each pad intersects the plane tangent to the base. Contact between the pads and the source support is thus ensured for temperatures ranging from -40°C to 25°C.

Le cas échéant, le module lumineux comporte une jonction élastique entre l'élément optique et le cadre apte à se déformer au montage de l'ensemble formé par le cadre et l'élément optique sur le support de source. L'ensemble formé par l'élément optique et le cadre peut ainsi être facilement assemblé sur le support de source.Where appropriate, the light module includes an elastic junction between the optical element and the frame capable of deforming when mounting the assembly formed by the frame and the optical element on the source support. The assembly formed by the optical element and the frame can thus be easily assembled on the source support.

Avantageusement, la jonction élastique est réalisée dans le même matériau que l'élément optique. Cela facilite la fabrication du module lumineux, une seule matière devant être injectée pour faire l'élément optique et la jonction élastique.Advantageously, the elastic junction is made of the same material as the optical element. This facilitates the manufacturing of the light module, a single material having to be injected to make the optical element and the elastic junction.

Quel que soit le mode de réalisation, pris seul ou combiné avec l'autre, l'élément optique et les plots sont réalisés dans un matériau élastiquement déformable. Par exemple, l'élément optique et les plots peuvent être réalisés en silicone. Ce matériau a pour avantage d'offrir une bonne tenue à des températures élevées, notamment jusqu'à 150°C, couramment rencontrée dans un environnement de dispositif d'éclairage et/ou de signalisation de véhicule automobile.Whatever the embodiment, taken alone or combined with the other, the optical element and the pads are made of an elastically deformable material. For example, the optical element and the pads can be made of silicone. This material has the advantage of offering good resistance to high temperatures, notably up to 150°C, commonly encountered in a environment of a motor vehicle lighting and/or signaling device.

Avantageusement, le cadre est réalisé dans un matériau moins élastiquement déformable que l'élément optique et les plots. Cela permet de faciliter la manipulation et le positionnement des guides de lumière en face des sources de lumière.Advantageously, the frame is made of a material that is less elastically deformable than the optical element and the pads. This makes it easier to handle and position the light guides in front of the light sources.

Avantageusement, le cadre est réalisé dans un matériau transparent aux rayons ultra-violets, afin de permettre la fixation du cadre au support de source avec une colle qui réticule sous l'effet d'un rayonnement ultra-violet.Advantageously, the frame is made of a material transparent to ultraviolet rays, in order to allow the frame to be fixed to the source support with an adhesive which crosslinks under the effect of ultraviolet radiation.

Le cadre peut par exemple être réalisé en polycarbonate (PC), en polyméthacrylate de méthyle (PMMA), en polyuréthane (PU) ou en polyétherimide (PEI).The frame can for example be made of polycarbonate (PC), polymethyl methacrylate (PMMA), polyurethane (PU) or polyetherimide (PEI).

Selon l'invention, le coefficient de dilatation du cadre est très inférieur au coefficient de dilatation des plots, ce qui permet d'assurer le contact entre les plots et le support de sources en cas d'élévation de la température.According to the invention, the coefficient of expansion of the frame is much lower than the coefficient of expansion of the pads, which makes it possible to ensure contact between the pads and the source support in the event of a rise in temperature.

Avantageusement, les plots sont issus de matière de l'élément optique. Ils peuvent ainsi être réalisés en même temps que l'élément optique. Alternativement, les plots sont rapportés sur l'élément optique. Ils sont alors réalisés séparément puis assemblés avec l'élément optique.Advantageously, the pads come from the material of the optical element. They can thus be produced at the same time as the optical element. Alternatively, the pads are attached to the optical element. They are then produced separately then assembled with the optical element.

Avantageusement, l'élément optique est surmoulé sur le cadre.Advantageously, the optical element is molded onto the frame.

Avantageusement, le support de source est un circuit imprimé.Advantageously, the source support is a printed circuit.

Avantageusement, les sources de lumière sont des diodes électroluminescentes également appelées LED pour l'acronyme anglais « Light Emitting Diode »
Avantageusement, le cadre comporte une interface de fixation du cadre au support de source. Par exemple, le cadre peut comprendre un ou plusieurs orifices dans lesquels une vis peut être positionnée. Alternativement, l'interface de fixation pourrait également être formée par un épaulement du cadre ou par une gorge de collage sur le cadre.Advantageously, the light sources are light-emitting diodes also called LEDs for the English acronym “Light Emitting Diode”
Advantageously, the frame includes an interface for fixing the frame to the source support. For example, the framework may include one or more holes in which a screw can be positioned. Alternatively, the fixing interface could also be formed by a shoulder of the frame or by a bonding groove on the frame.

D'autres caractéristiques et avantages de la présente invention apparaitront plus clairement à l'aide de la description et des dessins parmi lesquels :

  • la figure 1 représente un module lumineux selon l'invention
  • la figure 2 représente le module lumineux de la figure 1 sans la lentille de correction
  • la figure 3 représente une vue en perspective aval d'un support d'une matrice de diodes électroluminescentes
  • la figure 4 représente en vue en perspective amont de l'arrière d'un élément optique faisant partie du module lumineux de la figure 1
  • la figure 5 représente une vue en coupe d'une partie du module lumineux selon l'axe V-V présenté à la figure 2 selon un premier mode de réalisation sortant du cadre de l'invention
  • la figure 6 représente une vue en coupe d'une partie du module lumineux selon l'axe V-V présenté à la figure 2 selon un deuxième mode de réalisation entrant dans le cadre de l'invention
  • la figure 7 représente une vue en coupe de la pièce représentée à la figure 6 avant qu'elle ne soit assemblée avec un support de source
  • la figure 8 représente une vue en coupe du module lumineux selon un plan de coupe vertical latéral
Other characteristics and advantages of the present invention will appear more clearly with the help of the description and the drawings including:
  • there figure 1 represents a light module according to the invention
  • there figure 2 represents the light module of the figure 1 without the correction lens
  • there Figure 3 represents a downstream perspective view of a support of a matrix of light-emitting diodes
  • there Figure 4 represents in perspective view upstream of the rear of an optical element forming part of the light module of the figure 1
  • there Figure 5 represents a sectional view of a part of the light module along the axis VV presented in figure 2 according to a first embodiment falling outside the scope of the invention
  • there Figure 6 represents a sectional view of a part of the light module along the axis VV presented in figure 2 according to a second embodiment falling within the scope of the invention
  • there Figure 7 represents a sectional view of the part shown in Figure 6 before it is assembled with source media
  • there figure 8 represents a sectional view of the light module along a vertical lateral sectional plane

Dans la suite de la description, on adoptera à titre non limitatif des orientations suivantes :

  • longitudinale « L » orientée d'arrière en avant selon l'axe optique de l'optique de projection du module lumineux
  • transversale « T » orientée de gauche à droite
  • verticale « V » orientée de bas en haut
In the remainder of the description, we will adopt, on a non-limiting basis, the following orientations:
  • longitudinal “L” oriented from back to front along the optical axis of the projection optics of the light module
  • transversal “T” oriented from left to right
  • vertical “V” oriented from bottom to top

La figure 1 illustre un module lumineux 1 destiné à équiper un dispositif d'éclairage ou de signalisation de véhicule automobile. Le module lumineux 1 est apte à générer un faisceau lumineux vers l'avant.There figure 1 illustrates a light module 1 intended to equip a motor vehicle lighting or signaling device. The light module 1 is capable of generating a forward light beam.

Le module lumineux comporte un support de source 10 sur lequel est positionnée une pluralité de source de lumière 14. Le support de source 10 représenté est ici formé par un circuit imprimé 10'.The light module comprises a source support 10 on which a plurality of light sources 14 are positioned. The source support 10 shown here is formed by a printed circuit 10'.

Les sources de lumière 14, visibles notamment à la figure 3, sont réparties selon une rangée inférieure 12 et une rangée supérieure 13. Chaque rangée comporte treize sources de lumière 14. La superposition des deux rangées forme ainsi une matrice 15 de sources de lumière 14.The light sources 14, visible in particular at the Figure 3 , are distributed in a lower row 12 and an upper row 13. Each row has thirteen light sources 14. The superposition of the two rows thus forms a matrix 15 of light sources 14.

Les sources de lumière sont des diodes électroluminescentes.The light sources are light-emitting diodes.

La matrice 15 de sources de lumière 14 s'étend dans un plan orthogonal à la direction longitudinale « L ». Les sources de lumière 14 sont portées par la face avant du support de sources 10.The matrix 15 of light sources 14 extends in a plane orthogonal to the longitudinal direction “L”. The light sources 14 are carried by the front face of the source support 10.

Les sources de lumière 14 sont susceptibles d'émettre de la chaleur durant leur fonctionnement. Le support de source 10 sur lequel sont positionnées les sources de lumière 14 est positionné sur un dissipateur thermique 11. Le dissipateur thermique 11 comportant une pluralité d'ailettes 16 s'étendant dans la direction opposée au support de source 10 permet ainsi de dissiper la chaleur émise par les sources de lumière 14.The light sources 14 are likely to emit heat during their operation. The source support 10 on which the light sources 14 are positioned is positioned on a heat sink 11. The heat sink 11 comprising a plurality of fins 16 extending in the direction opposite to the source support 10 thus makes it possible to dissipate the heat emitted by light sources 14.

Les sources de lumière 14 émettent des rayons lumineux. Ces rayons lumineux doivent être mis en forme de sorte à ce que le module optique puisse projeter un faisceau lumineux sur la route.The light sources 14 emit light rays. These light rays must be shaped so that the optical module can project a light beam onto the road.

Le module optique 1 présente à cet effet un élément optique 30 apte à recevoir les rayons lumineux issus des sources de lumière 14. Pour que les rayons lumineux soient correctement mis en forme, les sources de lumière 14 doivent être positionnés de façon précise par rapport à l'élément optique 30. La position de l'élément optique par rapport au support de source est établie par l'intermédiaire d'un cadre 20.The optical module 1 has for this purpose an optical element 30 capable of receiving the light rays coming from the light sources 14. For the light rays to be correctly shaped, the light sources 14 must be positioned precisely relative to the optical element 30. The position of the optical element relative to the source support is established via a frame 20.

En effet, le cadre 20 permet de maintenir l'élément optique 30. Le cadre 20 est pourvu d'un trou central autour duquel l'élément optique 30 est surmoulé. Le cadre présente également trois orifices 21, 22, 23 dans lesquels une vis peut être positionnée de sorte à former une interface de fixation entre le cadre 20 et le support de source 10. Le cadre 20 peut alors être fixé au support de source 30 par l'intermédiaire de vis non représentées qui sont insérées dans les orifices 21, 22, 23. Alternativement, l'interface de fixation pourrait également être formée par un épaulement du cadre 20 ou par une gorge de collage sur le cadre 20.Indeed, the frame 20 makes it possible to hold the optical element 30. The frame 20 is provided with a central hole around which the optical element 30 is overmolded. The frame also has three orifices 21, 22, 23 in which a screw can be positioned so as to form a fixing interface between the frame 20 and the source support 10. The frame 20 can then be fixed to the source support 30 by via screws not shown which are inserted into the orifices 21, 22, 23. Alternatively, the fixing interface could also be formed by a shoulder of the frame 20 or by a bonding groove on the frame 20.

Le cadre 20 comporte une base 200 par laquelle il est en contact avec le support de source 10.The frame 20 includes a base 200 through which it is in contact with the source support 10.

L'élément optique 30 comporte une portion avant 30a visible à la figure 2 et une portion arrière 30b visible à la figure 4. La portion arrière 30b est formée par une pluralité de guides optiques 33, 34. Comme visible à la figure 8, les guides optiques 33, 34 s'étendent selon un axe principal longitudinal depuis une face d'entrée 33a, 34a jusqu'à une face d'extrémité avant 36a de sortie des rayons lumineux. Chaque guide de lumière est conçu pour guider les rayons lumineux entrant par la face d'entrée 33a, 34a jusqu'à la face d'extrémité avant 36a. L'ensemble des faces d'entrée 33a, 34a des guides optiques 33, 34 forme ainsi la face d'entrée de l'élément optique 30 et chaque face de d'extrémité avant 36a forme une source de lumière secondaire 36.The optical element 30 comprises a front portion 30a visible at the figure 2 and a rear portion 30b visible at the Figure 4 . The rear portion 30b is formed by a plurality of optical guides 33, 34. As visible in the figure 8 , the optical guides 33, 34 extend along a main longitudinal axis from an entry face 33a, 34a to a front end face 36a for exiting the light rays. Each light guide is designed to guide the light rays entering through the entrance face 33a, 34a to the front end face 36a. All of the entry faces 33a, 34a of the optical guides 33, 34 thus form the entry face of the optical element 30 and each front end face 36a forms a secondary light source 36.

La portion arrière 30b comporte au moins autant de guides optiques 33, 34 que de sources de lumière 14. Dans l'exemple illustré, la portion arrière 30b comporte autant de guides optiques 33, 34 que le nombre de sources de lumière 14 du module lumineux 1. En effet, la portion arrière 30b comporte une rangée inférieure 312 comportant treize guides optiques 33 et une rangée supérieure 313 comportant treize guides optiques 34. Chaque guide optique 33 de la rangée inférieur 312 est associé à une source de lumière 14 de la rangée inférieur 12 et chaque guide optique 34 de la rangée supérieure 313 est associé à une source de lumière 14 de la rangée supérieure 13.The rear portion 30b comprises at least as many optical guides 33, 34 as light sources 14. In the example illustrated, the rear portion 30b comprises as many optical guides 33, 34 as the number of light sources 14 of the light module 1. Indeed, the rear portion 30b comprises a lower row 312 comprising thirteen optical guides 33 and an upper row 313 comprising thirteen optical guides 34. Each optical guide 33 of the lower row 312 is associated with a light source 14 of the row lower 12 and each optical guide 34 of the upper row 313 is associated with a light source 14 of the upper row 13.

La source de lumière 14 à laquelle est associée le guide optique 33, 34 est disposée en regard de la face d'entrée 33a, 34a du guide optique 33, 34. La face d'entrée 33a, 34a du guide optique 33, 34 associé intercepte alors les rayons lumineux émis par la source de lumière 14 à laquelle il est associé.The light source 14 with which the optical guide 33, 34 is associated is arranged facing the input face 33a, 34a of the optical guide 33, 34. The face input 33a, 34a of the associated optical guide 33, 34 then intercepts the light rays emitted by the light source 14 with which it is associated.

Alternativement, l'élément optique 30 pourrait comporter une pluralité de microlentilles.Alternatively, the optical element 30 could comprise a plurality of microlenses.

Les faces d'entrée 33a, 34a des guides de lumière 33, 34 sont agencées dans un plan commun qui est parallèle au plan du support de source 10. Lorsque l'élément optique 30 est agencé dans le module optique 1, chaque face d'entrée 33a, 34a des guides optiques 33, 34 est positionnée en vis-à-vis et à proximité d'une source de lumière 14 associée de sorte à ce que la majorité des rayons lumineux émis par chaque source de lumière 14 entre dans le guide optique associé.The entrance faces 33a, 34a of the light guides 33, 34 are arranged in a common plane which is parallel to the plane of the source support 10. When the optical element 30 is arranged in the optical module 1, each face of entrance 33a, 34a of the optical guides 33, 34 is positioned opposite and close to an associated light source 14 so that the majority of the light rays emitted by each light source 14 enter the guide associated optics.

Chaque guide optique 33, 34 présente une section adaptée pour produire un faisceau lumineux élémentaire sortant de la forme souhaitée pour réaliser la fonction du module optique équipant le dispositif d'éclairage ou de signalisation.Each optical guide 33, 34 has a section adapted to produce an elementary light beam emerging from the desired shape to perform the function of the optical module equipping the lighting or signaling device.

Les faces d'extrémité avant des guides optiques 33, 34 formant les sources de lumière secondaires 36 sont agencées selon une surface courbe C. Les guides optiques 33, 34 situés vers l'extérieur de l'élément optique 30 présentent ainsi une longueur supérieure aux guides optiques 33, 34 situés au centre de l'élément optique 30.The front end faces of the optical guides 33, 34 forming the secondary light sources 36 are arranged along a curved surface C. The optical guides 33, 34 located towards the outside of the optical element 30 thus have a length greater than the optical guides 33, 34 located in the center of the optical element 30.

Dans une variante, les faces d'extrémité avant des guides optique 33, 34 pourraient être agencées dans un plan commun.In a variant, the front end faces of the optical guides 33, 34 could be arranged in a common plane.

Les faces d'extrémité avant des guides optiques 33, 34 forment ainsi une matrice de sources de lumière secondaires 36 qui émettent des faisceaux lumineux élémentaires. Ces faisceaux lumineux élémentaires sont mis en forme par la portion avant 30a de l'élément optique 30. Cette portion avant 30a permet par exemple d'étaler les faisceaux lumineux élémentaires verticalement et/ou horizontalement.The front end faces of the optical guides 33, 34 thus form a matrix of secondary light sources 36 which emit elementary light beams. These elementary light beams are shaped by the front portion 30a of the optical element 30. This front portion 30a makes it possible, for example, to spread the elementary light beams vertically and/or horizontally.

La portion avant 30a comporte une face 37 d'extrémité avant commune de sortie des rayons lumineux de l'élément optique 30.The front portion 30a has a common front end face 37 for exiting the light rays from the optical element 30.

La portion avant 30a est venue de matière avec les guides optiques 33, 34 de sorte à ce que l'élément optique 30 est un élément monobloc.The front portion 30a is integral with the optical guides 33, 34 so that the optical element 30 is a single-piece element.

Le module lumineux 1 comporte également une optique de projection 41 agencée longitudinalement à distance en avant de l'élément optique 30. L'optique de projection est apte à projeter les sources de lumière secondaire formées par les guides optiques vers l'infini pour former le faisceau lumineux final.The light module 1 also includes projection optics 41 arranged longitudinally at a distance in front of the optical element 30. The projection optics is capable of projecting the secondary light sources formed by the optical guides towards infinity to form the final light beam.

L'optique de projection comporte une surface focale objet S. Cette surface focale présente un défaut de courbure sphérique concave. Ce défaut est appelé aberration de champ de Petzval.The projection optics comprises an object focal surface S. This focal surface has a concave spherical curvature defect. This defect is called Petzval field aberration.

Pour que le faisceau final obtenu présente des caractéristiques lumineuses souhaitées pour son utilisation, il est nécessaire que les sources de lumière secondaire soient imagées de façon nette. Pour cela, chaque source de lumière secondaire doit être située sur la surface focale objet de l'optique de projection 41.For the final beam obtained to have the desired luminous characteristics for its use, it is necessary that the secondary light sources be imaged clearly. For this, each secondary light source must be located on the focal surface object of the projection optics 41.

Pour permettre de focaliser correctement l'optique de projection 41 sur les sources de lumière secondaires 36, une optique de correction de champ 40 est interposée entre l'élément optique 30 et la lentille de projection 41. Cette optique de correction de champ 40 est conçue pour corriger une partie de l'aberration de courbure de champ de l'optique de projection 41, l'autre partie de l'aberration de courbure de champ de l'optique de projection 41 étant corrigée grâce à la courbure formée par les sources de lumières secondaires 36.To enable the projection optics 41 to be correctly focused on the secondary light sources 36, a field correction optics 40 is interposed between the optical element 30 and the projection lens 41. This field correction optics 40 is designed to correct part of the field curvature aberration of the projection optics 41, the other part of the field curvature aberration of the projection optics 41 being corrected thanks to the curvature formed by the sources of secondary lights 36.

L'optique de correction de champ 40 est conformée de sorte que l'image de la surface focale objet S courbe par l'optique de correction de champ 41 s'étende dans un plan focal objet en coïncidence avec la surface courbe C d'émission de la matrice de sources de lumière secondaires 36.The field correction optics 40 is shaped so that the image of the object focal surface S curved by the field correction optics 41 extends in an object focal plane in coincidence with the curved emission surface C of the matrix of secondary light sources 36.

La portion arrière 30b de l'élément optique 30 comporte quatre plots 350 présentant une extrémité libre en saillie vers le support de source 10. L'autre extrémité des plots 350 est venue de matière avec l'élément optique 30. Les plots sont ainsi réalisés monobloc avec l'élément optique 30.The rear portion 30b of the optical element 30 comprises four pads 350 having a free end projecting towards the source support 10. The other end of the pads 350 is integral with the optical element 30. The pads are thus produced monobloc with optical element 30.

Les plots 350 sont répartis le long de la périphérie de la face d'entrée de l'élément optique 30. Les plots 350 sont positionnés de façon symétrique de part et d'autre d'un axe transversal passant par le milieu de la face d'entrée de l'élément optique 30 et de part et d'autre d'un axe vertical passant par le milieu de la face d'entrée de l'élément optique 30.The pads 350 are distributed along the periphery of the input face of the optical element 30. The pads 350 are positioned symmetrically on either side of a transverse axis passing through the middle of the face d entrance of the optical element 30 and on either side of a vertical axis passing through the middle of the entrance face of the optical element 30.

On pourrait prévoir, sans limitation de l'invention, d'avoir un autre nombre de plots et/ou de positionner les plots différemment à la périphérie de la face d'entrée de l'élément optique 30.It could be envisaged, without limitation of the invention, to have another number of pads and/or to position the pads differently at the periphery of the input face of the optical element 30.

Ici, chacun des plots 350 présente la même longueur. Dans une variante, il serait possible d'avoir des plots de différentes longueurs.Here, each of the pads 350 has the same length. In a variant, it would be possible to have pads of different lengths.

La répartition des plots 350 à la périphérie de la face d'entrée de l'élément optique 30 permet de répartir les points d'appui de l'élément optique 30 sur le support de source 10. En effet, lors du montage, les plots 350 viennent en contact direct ou indirect avec le support de source 10.The distribution of the pads 350 at the periphery of the input face of the optical element 30 makes it possible to distribute the support points of the optical element 30 on the source support 10. In fact, during assembly, the pads 350 come into direct or indirect contact with the source support 10.

Selon un premier mode de réalisation sortant du cadre de l'invention illustré à la figure 5, les plots 350 viennent en contact indirect avec le support de source 10.According to a first embodiment falling outside the scope of the invention illustrated in Figure 5 , the pads 350 come into indirect contact with the source support 10.

La projection orthogonale de l'extrémité libre des plots 350 sur une droite D perpendiculaire au plan tangent Ta à la base 200 est situé plus en amont ou au même niveau dans la direction de la base 200 que la projection de la face d'entrée du guide optique qui est située la plus en aval selon cette même direction parmi toutes les projections des faces d'entrée 33a, 34a des guides optiques 33, 34.The orthogonal projection of the free end of the pads 350 on a straight line D perpendicular to the tangent plane Ta at the base 200 is located further upstream or at the same level in the direction of the base 200 as the projection of the entrance face of the optical guide which is located furthest downstream in this same direction among all the projections of the entrance faces 33a, 34a of the optical guides 33, 34.

Les plots 350 sont alors plus éloignés du support de source 10 que les faces d'entrée 33a, 34a des guides optiques 33, 34.The pads 350 are then further away from the source support 10 than the input faces 33a, 34a of the optical guides 33, 34.

Les plots 350 viennent chacun au contact d'un espaceur 351 qui est en contact avec le support de source 10. L'élément optique 30 est alors référencé par rapport au support de source 10 par l'intermédiaire des espaceurs 351.The pads 350 each come into contact with a spacer 351 which is in contact with the source support 10. The optical element 30 is then referenced relative to the source support 10 via the spacers 351.

La projection orthogonale de l'élément formé par un espaceur 351 et le plot 350 auquel il est associé sur une droite D perpendiculaire au plan tangent Ta à la base 200 est alors situé plus en aval dans la direction de la base 200 que la projection de la face d'entrée du guide optique qui est située la plus en aval selon cette même direction parmi toutes les projections des faces d'entrée 33a, 34a des guides optiques 33, 34.The orthogonal projection of the element formed by a spacer 351 and the pad 350 with which it is associated on a straight line D perpendicular to the tangent plane Ta at the base 200 is then located further downstream in the direction of the base 200 than the projection of the entrance face of the optical guide which is located furthest downstream in this same direction among all the projections of the entrance faces 33a, 34a of the optical guides 33, 34.

Les espaceurs 351 garantissent ainsi le maintien d'un espace E entre les sources de lumière 14 est les faces d'entrée 33a, 34a de guides optiques 33, 34 associés, tout en permettant de minimiser cet espace E de sorte qu'un maximum des rayons lumineux issus des sources de lumière 14 entre par la face d'entrée 33a, 34a du guide optique 33, 34 associé. Cet écart peut par exemple être choisi inférieur à 0,4 mm.The spacers 351 thus guarantee the maintenance of a space E between the light sources 14 and the entry faces 33a, 34a of associated optical guides 33, 34, while making it possible to minimize this space E so that a maximum of light rays from the light sources 14 enter through the entrance face 33a, 34a of the associated optical guide 33, 34. This gap can for example be chosen to be less than 0.4 mm.

Les espaceurs 351 peuvent être positionnés sur le support de source 10, chaque plot 350 prenant ensuite appui sur un espaceur 351. Alternativement, les espaceurs 351 peuvent être rapportés à l'extrémité des plots 350. L'ensemble formé par les plots 350 et les espaceurs 351 permettent de positionner l'élément optique par rapport au support de source 10. Ainsi, la source de lumière 14 peut être positionnée au plus proche de la face d'entrée de l'élément optique sans entrer en contact avec cette dernière.The spacers 351 can be positioned on the source support 10, each pad 350 then bearing on a spacer 351. Alternatively, the spacers 351 can be attached to the end of the pads 350. The assembly formed by the pads 350 and the spacers 351 make it possible to position the optical element relative to the source support 10. Thus, the light source 14 can be positioned as close as possible to the entrance face of the optical element without coming into contact with the latter.

Selon un deuxième mode de réalisation représenté aux figures 6 et 7, les plots 350 viennent en contact direct avec le support de source 10.According to a second embodiment shown in figures 6 And 7 , the pads 350 come into direct contact with the source support 10.

La projection orthogonale de l'extrémité libre des plots 350 sur une droite D perpendiculaire au plan tangent Ta à la base 200 du cadre 20 est situé plus en aval dans la direction de la base 200 que la projection de la face d'entrée du guide optique qui est située la plus en aval selon cette même direction parmi toutes les projections des faces d'entrée 33a, 34a des guides optiques 33, 34.The orthogonal projection of the free end of the pads 350 on a straight line D perpendicular to the tangent plane Ta at the base 200 of the frame 20 is located further downstream in the direction of the base 200 than the projection of the entry face of the guide optical which is located furthest downstream in this same direction among all the projections of the input faces 33a, 34a of the optical guides 33, 34.

Les plots 350 sont alors plus proches du support de source 10 que les faces d'entrée 33a, 34a des guides optiques 33, 34. Les plots 350 viennent en contact avec le support de source 10 et permettent alors le maintien d'un espace entre la face d'entrée 33a, 34a des guides optiques et le support de source 10. La distance entre le support de source 10 et les faces d'entrée des guides optiques est donc maîtrisée par la longueur des plots 350.The pads 350 are then closer to the source support 10 than the input faces 33a, 34a of the optical guides 33, 34. The pads 350 come into contact with the source support 10 and then allow a space to be maintained between the entry face 33a, 34a of the optical guides and the source support 10. The distance between the source support 10 and the entry faces of the optical guides is therefore controlled by the length of the pads 350.

De plus, la longueur des plots 350 est calculée de sorte que cet espace soit supérieur à la hauteur des sources de lumière 14 considérées en projection orthogonale sur cette même droite D perpendiculaire au plan tangent Ta à la base 200. Ainsi, un espace E est garanti entre les sources de lumière 14 qui sont positionnées sur le support de sources 10 et les faces d'entrée 33a, 34a des guides optiques 33, 34 associés. Cet espace E est de plus tel qu'un maximum des rayons lumineux issus des sources de lumières 14 entrent par la face d'entrée 33a, 34a du guide optique 33, 34 associé. Cet écart peut par exemple être choisi inférieur à 0,4 mm.In addition, the length of the pads 350 is calculated so that this space is greater than the height of the light sources 14 considered in orthogonal projection on this same straight line D perpendicular to the tangent plane Ta at the base 200. Thus, a space E is guaranteed between the light sources 14 which are positioned on the source support 10 and the input faces 33a, 34a of the associated optical guides 33, 34. This space E is also such that a maximum of the light rays coming from the light sources 14 enter through the entrance face 33a, 34a of the associated optical guide 33, 34. This gap can for example be chosen to be less than 0.4 mm.

Selon ce mode de réalisation et dans l'exemple illustré, chaque plot 350 est sécant au plan tangent Ta à la base 200 du cadre 20, avant le montage de l'ensemble formé par l'élément optique 30 et le cadre 20 sur le support de source 10. Cela est notamment visible à la figure 7.According to this embodiment and in the example illustrated, each pad 350 intersects the tangent plane Ta at the base 200 of the frame 20, before mounting the assembly formed by the optical element 30 and the frame 20 on the support from source 10. This is particularly visible in the Figure 7 .

Le module lumineux 1 comporte une jonction élastique 24 entre l'élément optique 30 et le cadre 20 apte à se déformer au montage de l'ensemble formé par le cadre 20 et l'élément optique 30 sur le support de source 10. Cette jonction élastique 24 permet alors de positionner l'élément formé par le cadre 20 et l'élément optique 30 sur le support de source 10 sans déformer l'élément optique 30, et notamment sans endommager les guides optiques 33, 34.The light module 1 comprises an elastic junction 24 between the optical element 30 and the frame 20 capable of deforming when mounting the assembly formed by the frame 20 and the optical element 30 on the source support 10. This elastic junction 24 then makes it possible to position the element formed by the frame 20 and the optical element 30 on the source support 10 without deforming the optical element 30, and in particular without damaging the optical guides 33, 34.

Dans une variante dans laquelle les plots 350 auraient des longueurs différentes, il serait envisageable de combiner les deux modes de réalisation de sorte que certains plots 350 soient en contact indirect avec le support de source, par l'intermédiaire d'un espaceur et d'autres plots 350 soient en contact direct avec le support de source.In a variant in which the pads 350 would have different lengths, it would be possible to combine the two embodiments so that certain pads 350 are in indirect contact with the source support, via a spacer and other pads 350 are in direct contact with the source support.

De plus, dans chacun des modes de réalisation, les plots 350 sont réalisés dans le même matériau que l'élément optique 10. Ainsi, lorsque les sources de lumière 14 sont allumées et qu'elles produisent de la chaleur, l'élément optique 30 et les plots 350 se déforment de la même façon en fonction des variations de température. La déformation de l'élément optique 30 est donc compensée par la déformation des plots 350. Ainsi, une distance sensiblement constante peut être maintenue entre la face d'entrée de l'élément optique 30 et les sources de lumière 14, indépendamment des variations de températures.Furthermore, in each of the embodiments, the pads 350 are made of the same material as the optical element 10. Thus, when the light sources 14 are turned on and they produce heat, the optical element 30 and the pads 350 deform in the same way depending on temperature variations. The deformation of the optical element 30 is therefore compensated by the deformation of the pads 350. Thus, a substantially constant distance can be maintained between the entry face of the optical element 30 and the light sources 14, independently of variations in temperatures.

L'élément optique 30 et les plots 350 sont réalisés dans un matériau élastiquement déformable, par exemple en silicone. Dans la présente invention, on entend par élastiquement déformable que le matériau se déforme sans rupture lorsqu'il subit une force de contrainte. Il est donc flexible.The optical element 30 and the pads 350 are made of an elastically deformable material, for example silicone. In the present invention, elastically deformable means that the material deforms without breaking when it is subjected to a constraint force. It is therefore flexible.

Selon un autre exemple, ils pourraient être réalisés en polycarbonate, en polyméthylméthacrylate (PMMA) ou en tout autre matériau adapté pour la réalisation de guides optiques 33, 34
De plus, dans le deuxième mode de réalisation, la jonction élastique 24 est avantageusement réalisée dans le même matériau que l'élément optique 30 et les plots 350. Ainsi, lorsque les sources de lumière 14 sont allumées et dissipent de la chaleur, l'élément optique 30, les plots 350 et la jonction élastique 24 subissent la même déformation, ce qui participe à maintenir la distance entre les sources de lumière 14 et les faces d'entrée 33a, 34a des guides optiques 33, 34 sensiblement constante.According to another example, they could be made of polycarbonate, polymethylmethacrylate (PMMA) or any other material suitable for the production of optical guides 33, 34
Furthermore, in the second embodiment, the elastic junction 24 is advantageously made of the same material as the optical element 30 and the pads 350. Thus, when the light sources 14 are turned on and dissipate heat, the optical element 30, the pads 350 and the elastic junction 24 undergo the same deformation, which contributes to maintaining the distance between the light sources 14 and the input faces 33a, 34a of the optical guides 33, 34 substantially constant.

Le cadre 20 est réalisé dans un matériau moins élastiquement déformable que l'élément optique et les plots, et permet ainsi d'assurer la bonne fixation de l'élément formé par le cadre 20 et l'élément optique 30 au support de source 10 et de faciliter le positionnement des guides optiques 33, 34 en face des sources de lumière 14. En particulier, le coefficient de dilatation du cadre 20 est très inférieur au coefficient de dilatation des plots 350.The frame 20 is made of a less elastically deformable material than the optical element and the pads, and thus makes it possible to ensure good fixing of the element formed by the frame 20 and the optical element 30 to the source support 10 and to facilitate the positioning of the optical guides 33, 34 opposite the light sources 14. In particular, the coefficient of expansion of the frame 20 is much lower than the coefficient of expansion of the pads 350.

Claims (8)

  1. Light module (1) of a lighting and/or signalling device for a motor vehicle, comprising:
    at least one light source (14) positioned on a source support (10)
    an optical element (30) comprising an input face which receives light rays emitted by said at least one light source (14) and is positioned facing the latter a frame (20) supporting the optical element (30) and fastened to said source support (10)
    the optical element (30) having at least one stud (350) having a free end projecting towards the source support (10), said at least one stud (350) being made of the same material as the optical element (30) and being in direct or indirect contact with the source support (10) when the light module (1) is assembled, and in that the optical element (30) comprises a plurality of optical guides (33, 34), each comprising an input face (33a, 34a) forming said input face of the optical element (30), and in that the optical element (30) also comprises at least as many optical guides as there are light sources (14), each of the light sources (14) being associated with an optical guide (33, 34) so that light rays emitted by each light source (14) enter the optical element (30) through the input face (33a, 34a) of the optical guide (33, 34) with which it is associated,
    the frame (20) comprising a base (200) by means of which it is in contact with said source support (10), and the orthogonal projection of the free end of at least one of the studs (350) onto a straight line D perpendicular to the plane Ta tangent to said base (200) is located further downstream, in the direction of the base (200), than the projection of that input face (33a, 34a) of the optical guide (33, 34) that is located furthest downstream in this same direction from among all the projections of the input faces (33a, 34a) of the optical guides (33, 34), and before the assembly formed by the optical element (30) and the frame (20) is mounted on the source support (10), each stud (350) is secant to the plane Ta tangent to the base (200),
    characterized in that the coefficient of expansion of the frame (20) is much lower than the coefficient of expansion of the studs (350).
  2. Light module (1) according to the preceding claim, characterized in that the distance between the at least one light source (14) and the input face of the optical element (30) is less than 0.4 mm.
  3. Light module (1) according to either one of the preceding claims, characterized in that the optical element (30) comprises a plurality of studs (350), for example 2 studs, 3 studs or 4 studs.
  4. Light module (1) according to any one of the preceding claims, characterized in that the at least one stud (350) is placed on the periphery of the input face of the optical element (30).
  5. Light module (1) according to any one of the preceding claims, characterized in that it comprises a resilient joint (24) between the optical element (30) and the frame (20), which can be deformed when the assembly formed by the frame (20) and the optical element (30) is mounted on the source support (10).
  6. Light module (1) according to Claim 5, characterized in that the resilient joint (24) is made of the same material as the optical element (30).
  7. Light module (1) according to any one of the preceding claims, characterized in that the optical element (30) and the studs (350) are made of a resiliently deformable material.
  8. Light module (1) according to any one of the preceding claims, characterized in that the frame (20) is made of a less resiliently deformable material than the optical element (30) and the studs (350).
EP19766291.9A 2018-09-19 2019-09-17 Light system for a lighting and/or signalling device of a motor vehicle Active EP3853517B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1858477A FR3085903B1 (en) 2018-09-19 2018-09-19 LIGHTING SYSTEM FOR LIGHTING AND / OR SIGNALING DEVICES OF A MOTOR VEHICLE
PCT/EP2019/074907 WO2020058289A1 (en) 2018-09-19 2019-09-17 Luminous system for a lighting and/or signalling device of a motor vehicle

Publications (2)

Publication Number Publication Date
EP3853517A1 EP3853517A1 (en) 2021-07-28
EP3853517B1 true EP3853517B1 (en) 2024-01-03

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EP19766291.9A Active EP3853517B1 (en) 2018-09-19 2019-09-17 Light system for a lighting and/or signalling device of a motor vehicle

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US (1) US11435046B2 (en)
EP (1) EP3853517B1 (en)
JP (1) JP7330266B2 (en)
CN (1) CN112739948B (en)
FR (1) FR3085903B1 (en)
WO (1) WO2020058289A1 (en)

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JP7579709B2 (en) * 2021-01-22 2024-11-08 スタンレー電気株式会社 Vehicle lighting fixtures
USD1029318S1 (en) * 2021-03-11 2024-05-28 Hasco Vision Technology Co., Ltd. Lens module for automobile lamp
USD1019995S1 (en) * 2021-03-11 2024-03-26 Hasco Vision Technology Co., Ltd. Lens module for automobile lamp

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JP5206658B2 (en) * 2009-12-16 2013-06-12 豊田合成株式会社 Light source unit
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FR3026462B1 (en) * 2014-09-30 2019-06-28 Valeo Vision Belgique VEHICLE LIGHT DEVICE WITH PLATE OPTICAL ELEMENT WITH LIGHT SOURCE SUPPORT
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FR3085903B1 (en) 2021-06-25
EP3853517A1 (en) 2021-07-28
WO2020058289A1 (en) 2020-03-26
CN112739948A (en) 2021-04-30
JP7330266B2 (en) 2023-08-21
CN112739948B (en) 2023-04-04
US20210348732A1 (en) 2021-11-11
JP2022501773A (en) 2022-01-06
FR3085903A1 (en) 2020-03-20
US11435046B2 (en) 2022-09-06

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