EP2871406A1 - Primary optical element, lighting module and headlight for motor vehicle - Google Patents

Primary optical element, lighting module and headlight for motor vehicle Download PDF

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Publication number
EP2871406A1
EP2871406A1 EP20140191981 EP14191981A EP2871406A1 EP 2871406 A1 EP2871406 A1 EP 2871406A1 EP 20140191981 EP20140191981 EP 20140191981 EP 14191981 A EP14191981 A EP 14191981A EP 2871406 A1 EP2871406 A1 EP 2871406A1
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EP
European Patent Office
Prior art keywords
optical element
face
light
input member
primary optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20140191981
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German (de)
French (fr)
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EP2871406B1 (en
Inventor
Marine Courcier
Delphine Puech
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Valeo Vision SAS
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Valeo Vision SAS
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Publication date
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Priority to EP18168736.9A priority Critical patent/EP3372893A1/en
Publication of EP2871406A1 publication Critical patent/EP2871406A1/en
Application granted granted Critical
Publication of EP2871406B1 publication Critical patent/EP2871406B1/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]
    • F21S41/143—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
    • F21S41/10—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
    • 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
    • F21S41/25—Projection lenses
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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

Definitions

  • the technical field of the invention is that of lighting modules for motor vehicles.
  • a motor vehicle is equipped with headlamps, or headlights, intended to illuminate the road in front of the vehicle, at night or in the case of reduced luminosity.
  • headlamps can generally be used in two lighting modes: a first mode “high beam” and a second mode “low beam”.
  • the "high beam” mode provides strong illumination of the road far ahead of the vehicle.
  • the "low beam” mode provides more limited road lighting, but still offers good visibility without dazzling other road users.
  • These two lighting modes are complementary.
  • the driver of the vehicle must manually switch modes depending on the circumstances, at the risk of inadvertently dazzle another user of the road. In practice, changing the lighting mode manually can be unreliable and sometimes dangerous.
  • the dipped beam mode provides visibility sometimes unsatisfactory for the driver of the vehicle.
  • ADB Adaptive Driving Beam
  • Such an ADB function is intended to automatically detect a user of the road likely to be dazzled by a beam of light emitted in headlight mode by a projector, and to modify the outline of this beam of light in a manner to create a shadow zone at the location of the detected user.
  • the advantages of the ADB function are multiple: comfort of use, better visibility compared to a lighting in dipped beam mode, better reliability for the change of mode, risk of dazzling greatly reduced, driving safer.
  • a system comprising a plurality of light sources, a primary optical element and an associated projection optical element, in which the element primary optical system comprises a plurality of light guides and the light guides are outputly connected to a corrective part having an exit face, the light guides and the corrective part forming a one-piece structure and the outputs of the optical element guides.
  • the element primary optical system comprises a plurality of light guides and the light guides are outputly connected to a corrective part having an exit face, the light guides and the corrective part forming a one-piece structure and the outputs of the optical element guides.
  • the element primary optical system comprises a plurality of light guides and the light guides are outputly connected to a corrective part having an exit face, the light guides and the corrective part forming a one-piece structure and the outputs of the optical element guides.
  • primary being positioned in an object focal plane of the projection optical element.
  • each light source enters the associated light guide, propagates to an exit zone of the guide to open into the corrective portion, and is emitted via the exit face of the corrective portion to the element.
  • associated secondary optics The light emitted by each optical guide exit zone and projected by the secondary optical element forms a vertical light segment at the front of the vehicle.
  • the light sources can be switched on independently of one another selectively to obtain the desired illumination.
  • each vertical light segment intensively illuminates the road on one vertical side and has a large extent on the other vertical side so as to improve the visibility of the driver of the vehicle.
  • the present invention aims to solve these problems.
  • the subject of the invention is therefore a primary optical element for a motor vehicle light module, comprising a single one-piece input member and a corrective part, the input member having at least one input face intended to receive the light, the input member being connected at the output to the corrective part, the corrective part comprising an output face of at least partly dome-shaped substantially spherical light, the input member and the corrective portion forming a one-piece structure, characterized in that a vertical profile of the input face of the input member has, in particular over its entire surface, a first convex part and a second flat or concave part.
  • vertical profile of the input face is understood to mean the profile of the input face in a section of this input face by a vertical plane containing an optical axis of the primary optical element during a normal use of the primary optical element, for example when the light module is mounted in the motor vehicle.
  • the presence of a single monobloc input member facilitates the industrialization of the production of such a primary optical element.
  • the first convex portion of the vertical profile of the input face is shaped so that, when a light source is placed opposite this input face to form a vertical light segment, light rays emitted by this source penetrate into the primary optical element via the first convex portion, exit the primary optical element via the output face of the corrective portion and are concentrated on one side of the vertical light segment.
  • the second concave or flat part is shaped so that other light rays emitted by this source penetrate into the primary optical element via the second flat or concave part, and leave the primary optical element via the exit face of the corrective part. and are thus spread to the other side of the vertical light segment.
  • the light rays are not or little deviated due to the substantially spherical dome shape of the output face of this corrective part.
  • the vertical distribution of the vertical light segment is such that the light is highly concentrated on one side of the segment and is spread towards the other side of the segment.
  • the terms "the input member being outputly connected to the correcting portion” mean that the input member is arranged so that light received by the input member opens into the correcting portion of the input level of an output area of the input member, this output area being disposed at the junction between the input member and the corrective part.
  • This exit zone may be flat or curved.
  • substantially spherical dome means a surface whose shape at least partially matches that of a sphere.
  • the corrective part is defined at least by an exit face having at least one spherical portion.
  • the respective refractive indices of the input member and the corrective part are substantially identical.
  • substantially identical refractive indices equal to one hundredth.
  • the input member and the corrective portion may be made of the same material. If necessary, the input member and the corrective part come from the same polymer, for example polymethyl methacrylate.
  • the substantially spherical dome-shaped exit face is centered substantially at the exit zone of the input member, in particular in the center of this exit zone.
  • the corrective portion may be substantially in the shape of a half-sphere.
  • the input face has, in particular over its entire surface, a straight horizontal profile.
  • horizontal profile of the input face is intended to mean the profile of the input face in a section of this input face by a plane perpendicular to the optical axis of the primary optical element when a use normal of the primary optical element, for example when the light module is mounted in the motor vehicle
  • the input member has a cylindrical shape having a generator and a director.
  • the input member has a shape obtained by translation of the generator along the director.
  • the primary optical element having an optical axis
  • said director is a line segment perpendicular to the optical axis.
  • the director corresponds to the horizontal profile of the input face.
  • the input member has an upper reflection face having a convex vertical profile.
  • the upper face may comprise an ellipse portion.
  • the upper face extends from the entry face, in particular from the first convex portion of the entry face, to the corrective portion.
  • This convex vertical profile reflection upper face is shaped so that rays of light emitted by the source, penetrating into the input member and reaching this upper face, are reflected, by total internal reflection, by this upper face towards the face. output and contribute to the concentration of light on one side of the segment.
  • the input member has a flat bottom spreading face.
  • the lower face extends from the input face, in particular from the concave or flat part of the input face, to the corrective part.
  • This flat bottom spreading face is shaped so as to widen the vertical section of the input member from its inlet face to the exit zone. This enlargement of the input member contributes to the spread of light on the other side of the segment.
  • the upper and lower faces are arranged contiguously on either side of the input face.
  • the generatrix of the input member is thus formed by the convex profile of the upper face, the profile of the input face and the plane profile of the lower face.
  • the input member has two side faces, extending between side edges of the upper and lower faces and from the input face to the corrective portion.
  • the input face has, particularly over its entire surface, a corrugated horizontal profile.
  • the horizontal profile of the entrance face may have, especially along its length, a succession of convex portions contiguous one by one.
  • Each convex portion is arranged so that, when a light source is disposed opposite a convex portion and a ray emitted by this light source reaches another adjacent convex portion, the adjacent convex portion refracts this ray toward the output side of the corrective part in a given direction, so that this ray is not emitted by the light module.
  • the convex portions of the horizontal profile may have the same profile, in particular spherical.
  • the input member has a planar upper face.
  • the upper face extends from the input face, in particular from the convex portion of the input face, to the corrective portion.
  • the concave or planar portion of the entrance face extends to the corrective portion.
  • the subject of the invention is also a light module, in particular for illuminating the road, of a motor vehicle, comprising a plurality of light sources, for example four light sources, a primary optical element according to the invention adapted to receive the rays of light emitted by the light sources and a secondary optical element, the secondary optics being arranged to receive light rays issuing from the output face of the corrective part of the primary optical element and to project these rays in a region from the road in front of the light module.
  • a light module in particular for illuminating the road, of a motor vehicle, comprising a plurality of light sources, for example four light sources, a primary optical element according to the invention adapted to receive the rays of light emitted by the light sources and a secondary optical element, the secondary optics being arranged to receive light rays issuing from the output face of the corrective part of the primary optical element and to project these rays in a region from the road in front of the light module.
  • the secondary optical element is preferably distinct from the primary optical element, in particular arranged at a distance from the primary optical element along the optical axis of the primary optical element.
  • the secondary optical element is a projection lens.
  • the projection lens has a front face and a rear face and comprises diffusing elements, for example tori, on its front face and / or its rear face.
  • the secondary optical element may be a reflector
  • the secondary optical element may be a projection system comprising a plurality of lenses and / or reflectors.
  • each source is an electroluminescent semiconductor element.
  • all the sources can be arranged in a single row of sources, especially in the form of a multi-chip LED, each source being activatable for the emission of light rays independently of other sources.
  • each chip of the multi-chip LED thus forms a light source, all sources being arranged very close to each other.
  • the distance between two neighboring sources may be less than 0.5 mm.
  • the primary optical element being in accordance with the first embodiment described above, the secondary optical element has a horizontal focusing surface and a vertical focusing surface.
  • horizontal focusing surface is meant a surface defined by a set of points such that all the rays emitted by a source disposed at one of these points are directed by the secondary optical element so that they exit the luminous module parallel to each other, in a plane containing a horizontal line perpendicular to the optical axis of the secondary optical element.
  • vertical focusing surface is meant a surface defined by a set of points such that all the rays emitted by a source disposed at one of these points are directed by the secondary optical element so that they exit the light module parallel to each other, in a plane containing a vertical line perpendicular to the optical axis of the secondary optical element.
  • the optical axis of the secondary optical element coincides with the optical axis of the primary optical element.
  • the horizontal focusing surface of the secondary optical element passes through all the emission surfaces of the light sources.
  • the emission surfaces of the light sources may be arranged on a horizontal line perpendicular to the optical axis of the secondary optical element.
  • the rays emitted from a point of this source, disposed on said horizontal line pass through the primary optical element and are projected by the secondary optical element parallel to the optical axis. Consequently, the horizontal width of the light segment formed by this light source is directly related, in particular proportionally, to the width of said source, which makes it possible to create a light segment of particularly fine width.
  • the secondary optics may be magnified, the width of the light segment being equal to the width of the light source multiplied by this magnification.
  • the exit zone of the input member coincides with the vertical focusing surface of the secondary optical element.
  • the input member creates on the output zone secondary sources whose vertical distribution is such that the light is very concentrated on one side of this source and is spread towards the other side of this source.
  • the rays of each secondary source are then projected by the secondary optical element, parallel to each other in a vertical plane, which allows to create a light segment having the same vertical distribution.
  • the primary optical element being in accordance with the second embodiment described above, the secondary optical element has a single focusing surface.
  • the output zone of the input member is coincident with the focusing surface of the secondary optical element.
  • the input member creates on the output zone secondary sources whose vertical distribution is such that the light is very light. concentrated on one side of this source and spread to the other side of this source.
  • the rays of each secondary source are then projected by the secondary optical element, parallel to each other in a vertical plane, which allows to create a light segment having the same vertical distribution.
  • the horizontal profile of the input face having, especially over its entire length, a succession of convex portions contiguous one by one, the light sources are arranged in front of each convex portion.
  • the adjacent convex portion refracts this ray towards the exit face of the portion correction in a given direction, so that this ray is directed outside the secondary optical element. Consequently, the width of the light segment formed by a light source is directly related, in particular proportionally, to the width of the convex portion in front of which said light source is placed.
  • the secondary optics may have a magnification, the width of the light segment being equal to the width of the convex portion multiplied by this magnification.
  • the invention also relates to a motor vehicle headlight, characterized in that it comprises at least one light module as previously defined, including several light modules.
  • An orthogonal three-dimensional coordinate system is also represented on the figure 1 , the z axis corresponding to the vertical.
  • the Figures 1 to 3 represent a light module 1, in operational position, intended to equip a motor vehicle headlamp, according to a first embodiment.
  • the Figures 1, 2 and 3 respectively represent a perspective view, a side view, in the direction XX ', and a view from above, in the direction ZZ', of the light module.
  • Each source 1 a-1 d is an electroluminescent semiconductor element formed by a chip of a multi-chip LED. Each source is activatable for the emission of light rays independently of other sources.
  • the primary optical element 2 comprises a single monobloc light input member 3 and a corrective part 4.
  • the input member 3 is connected at the level of an exit zone 3a to the corrective part 4, the whole forming a monobloc structure.
  • monobloc structure is meant that the elements of the structure (here the input member 3 and the corrective part 4) are not separable without destruction of at least one of the elements.
  • the corrective part 4 is a sphere portion, or a ball portion, centered on the exit zone 3a. More precisely, the corrective part 4 is a half-ball whose center is situated in the exit zone 3a and on the optical axis 6.
  • the front surface 4a of the corrective part 4 in the form of a spherical dome or a spherical portion, constitutes an exit front face.
  • the rear 4b of the corrective part 4 extends here in the cutting plane of the half-sphere.
  • the input member 3 and the corrective part 4 are made of the same transparent material, for example polymethyl methacrylate, and have the same refractive index.
  • the upper face 3c is an upper reflection face 3c having over its entire surface a convex vertical profile comprising an ellipse portion, extending from the input face 31 to the rear 4b of the corrective portion 4.
  • the lower face 3d is a lower plane 3d spreading surface extending from the input face 31 to the rear 4b of the corrective part.
  • the first convex portion 31a of the vertical profile of the input face 31 is shaped so that the light rays emitted by the sources 1a-1d and penetrating into the primary optical element 3 via the first convex portion 31a, open into the part corrector 4 at the exit zone 3a in a vertically concentrated zone.
  • the second concave part 31b is shaped so that the light rays emitted by these sources 1a-1d and penetrating into the primary optical element 3 via the second concave part 31b open into the corrective part 4 at the exit zone 3a. in a vertically spread zone.
  • the optical axis 6 of the secondary optical element 5 passes through the vertically concentrated zone.
  • the upper reflection face 3c is shaped so that rays of light emitted by the sources 1a-1d, penetrating into the input member 3 and reaching this upper face 3c are reflected, by total internal reflection, by this upper face 3c so that they open into the corrective portion 4 at the exit zone 3a in said vertically concentrated zone.
  • the lower spreading face 3d is shaped so as to widen the vertical section of the input member 3 from its inlet face 31 to the exit zone 3a so that all the spokes passing through the second concave portion 31b open into said vertically spread zone without encountering obstacle on their way.
  • the input member has a width, measured in the direction XX ', sufficient for none of the rays emitted by the light sources 1a-1d to meet the side faces 3b.
  • the role of the corrective part 4, in cooperation with the input member 3, is twofold.
  • the input member has the effect of reducing the opening of the light rays emitted by the sources 1a-1d, the rays entering the body being folded by the laws of refraction.
  • the light rays are not deflected due to the connection between the input member 3 and the corrective part 4. Thanks to this, the reduced opening of the rays is maintained. .
  • the light rays coming out of the corrective part 4 by the exit face 4a are not or little deviated thanks to the spheroidal dome shape of the exit face 4a.
  • the corrective part 4 also makes it possible to correct the field aberrations of the optical system and thus ensure good quality imaging, as will be explained further later.
  • the secondary optical element 5 is a projection lens disposed remotely in front of the primary optical element 3 along the optical axis 6.
  • the secondary optical element 5 has a horizontal focusing surface 5a and a vertical focusing surface 5b.
  • the horizontal focusing surface 5a of the secondary optical element 4 passes through all the emission surfaces of the light sources 1a-1d.
  • each source is capable of forming a light segment whose horizontal width is directly related to the width of said source, which allows to create a light segment of generally rectangular shape and particularly thin width.
  • the exit zone 3a of the input member 3 coincides with the vertical focusing surface 5b of the secondary optical element.
  • the input member 3 creates on the exit zone 3a secondary sources whose vertical distribution comprises said vertically concentrated and spread zones.
  • the rays of each secondary source are then projected by the secondary optical element parallel to each other in a vertical plane, thereby creating a light segment having a vertical distribution such that light is highly concentrated on one side of the segment and is spread to the other side of the segment.
  • the ball portion shape of the corrective portion 4 improves imaging in the field. One can thus generate several light segments, with good imaging, using a same primary optical element 2 and from the light input member 3, positioned around the optical axis 6.
  • the half ball 4 slightly changing the orientation of the rays emitted by the output zone 3a which are offset with respect to the optical axis 6, at the output interface 4a, has a field corrector effect.
  • FIGS. 4, 5 and 6 respectively represent a perspective view, a side view, in the direction XX ', and a view from above, in the direction ZZ', of the light module.
  • the light module 1 comprises a plurality of light sources 1a-1g, represented only in Figures 5 and 6 .
  • the horizontal profile of the inlet face 31 has, over its entire length, a succession of convex portions 31c contiguous one by one.
  • the convex portions 31c of the horizontal profile all have the same profile, in particular spherical.
  • the light sources are disposed in front of each convex portion 31c.
  • the upper face 3c extends from the inlet face to the rear part 4b of the corrective part 4.
  • the second flat part 31b extends to the rear part 4b of the corrective part 4.
  • the second flat portion 31b is shaped so as to widen the vertical section of the input member 3 to the exit zone 3a so that all the rays passing through the second plane portion 31b open into a zone vertically spread without encountering obstacles on their way
  • Each convex portion 31c is arranged so that, a ray emitted by the light source disposed in front of this convex portion 31c reaches another adjacent convex portion, the adjacent convex portion refracts this ray towards the exit face 4a of the corrective portion 4 in a given direction, so that this ray is directed outside the secondary optical element 5.
  • the input member 3 therefore creates at the exit zone 3a secondary sources whose width is directly related the width of the convex portions 31c and vertically presenting concentration zones and spreading zones.
  • the projection lens 5 has a single focusing surface 5a, coinciding with the exit zone 3a.
  • the radii of each secondary source are thus projected by the projection lens 5, parallel to each other, which makes it possible to create a luminous segment of generally rectangular shape, the horizontal width of which is directly related to the width of the convex portions 31c and presenting a vertical distribution such that the light is highly concentrated on one side of the segment and is spread towards the other side of the segment.

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

Abstract

L'invention concerne un élément optique primaire (2) pour module lumineux de véhicule automobile, comprenant un unique organe d'entrée monobloc (3) et une partie correctrice (4), l'organe d'entrée présentant au moins une face d'entrée (31) destinée à recevoir de la lumière, l'organe d'entrée étant relié en sortie à la partie correctrice, la partie correctrice comportant une face de sortie de lumière (4a) au moins en partie en forme de dôme sensiblement sphérique, l'organe d'entrée et la partie correctrice formant une structure monobloc, caractérisé en ce que un profil vertical de la face d'entrée de l'organe d'entrée présente une première partie convexe (31 a) et une deuxième partie plane ou concave (31 b).The invention relates to a primary optical element (2) for a motor vehicle light module comprising a single monobloc input member (3) and a corrective part (4), the input member having at least one face of an input (31) for receiving light, the input member being outputly connected to the correcting portion, the corrective portion having a light-emitting (4a) at least partially substantially spherical-shaped, the input member and the corrective part forming a one-piece structure, characterized in that a vertical profile of the input face of the input member has a first convex portion (31 a) and a second flat portion or concave (31b).

Description

Le domaine technique de l'invention est celui des modules d'éclairage pour véhicules automobiles.The technical field of the invention is that of lighting modules for motor vehicles.

Un véhicule automobile est équipé de projecteurs, ou phares, destinés à illuminer la route devant le véhicule, la nuit ou en cas de luminosité réduite. Ces projecteurs peuvent généralement être utilisés selon deux modes d'éclairage : un premier mode « feux de route » et un deuxième mode « feux de croisement ». Le mode « feux de route » permet d'éclairer fortement la route loin devant le véhicule. Le mode « feux de croisement » procure un éclairage plus limité de la route, mais offrant néanmoins une bonne visibilité, sans éblouir les autres usagers de la route. Ces deux modes d'éclairage sont complémentaires. Le conducteur du véhicule doit manuellement changer de mode en fonction des circonstances, au risque d'éblouir par inadvertance un autre usager de la route. En pratique, le fait de changer de mode d'éclairage de façon manuelle peut manquer de fiabilité et s'avérer parfois dangereux. En outre, le mode feux de croisement procure une visibilité parfois insatisfaisante pour le conducteur du véhicule.A motor vehicle is equipped with headlamps, or headlights, intended to illuminate the road in front of the vehicle, at night or in the case of reduced luminosity. These headlamps can generally be used in two lighting modes: a first mode "high beam" and a second mode "low beam". The "high beam" mode provides strong illumination of the road far ahead of the vehicle. The "low beam" mode provides more limited road lighting, but still offers good visibility without dazzling other road users. These two lighting modes are complementary. The driver of the vehicle must manually switch modes depending on the circumstances, at the risk of inadvertently dazzle another user of the road. In practice, changing the lighting mode manually can be unreliable and sometimes dangerous. In addition, the dipped beam mode provides visibility sometimes unsatisfactory for the driver of the vehicle.

Pour améliorer la situation, des projecteurs dotés d'une fonction ADB (Adaptive Driving Beam) d'éclairage adaptatif ont été proposés. Une telle fonction ADB est destinée à détecter de façon automatique un usager de la route susceptible d'être ébloui par un faisceau d'éclairage émis en mode feux de route par un projecteur, et à modifier le contour de ce faisceau d'éclairage de manière à créer une zone d'ombre à l'endroit où se trouve l'usager détecté. Les avantages de la fonction ADB sont multiples : confort d'utilisation, meilleure visibilité par rapport à un éclairage en mode feux de croisement, meilleure fiabilité pour le changement de mode, risque d'éblouissement fortement réduit, conduite plus sûre.To improve the situation, floodlights with Adaptive Driving Beam (ADB) function have been proposed. Such an ADB function is intended to automatically detect a user of the road likely to be dazzled by a beam of light emitted in headlight mode by a projector, and to modify the outline of this beam of light in a manner to create a shadow zone at the location of the detected user. The advantages of the ADB function are multiple: comfort of use, better visibility compared to a lighting in dipped beam mode, better reliability for the change of mode, risk of dazzling greatly reduced, driving safer.

Afin de réaliser une telle fonction ADB, il est par exemple connu un système comprenant une pluralité de sources de lumière, un élément optique primaire et un élément optique de projection associé, dans lequel l'élément optique primaire comprend une pluralité de guides de lumière et les guides de lumière sont reliés en sortie à une partie correctrice comportant une face de sortie, les guides de lumière et la partie correctrice formant une structure monobloc et les sorties des guides de l'élément optique primaire étant positionnées dans un plan focal objet de l'élément optique de projection.In order to achieve such an ADB function, it is for example known a system comprising a plurality of light sources, a primary optical element and an associated projection optical element, in which the element primary optical system comprises a plurality of light guides and the light guides are outputly connected to a corrective part having an exit face, the light guides and the corrective part forming a one-piece structure and the outputs of the optical element guides. primary being positioned in an object focal plane of the projection optical element.

La lumière émise par chaque source de lumière pénètre dans le guide de lumière associé, se propage jusqu'à une zone de sortie du guide pour déboucher dans la partie correctrice, puis est émise via la face de sortie de la partie correctrice vers l'élément optique secondaire associé. La lumière émise par chaque zone de sortie de guide optique et projetée par l'élément optique secondaire, forme à l'avant du véhicule un segment lumineux vertical. Les sources de lumière peuvent être allumées indépendamment l'une de l'autre, de façon sélective, pour obtenir l'éclairage souhaité.The light emitted by each light source enters the associated light guide, propagates to an exit zone of the guide to open into the corrective portion, and is emitted via the exit face of the corrective portion to the element. associated secondary optics. The light emitted by each optical guide exit zone and projected by the secondary optical element forms a vertical light segment at the front of the vehicle. The light sources can be switched on independently of one another selectively to obtain the desired illumination.

Un tel système d'éclairage présente néanmoins certains inconvénients.Such a lighting system nevertheless has certain disadvantages.

En premier lieu, un tel système, du fait de l'utilisation de plusieurs guides de lumière nécessairement espacés les un des autres, ne permet pas la formation de segments lumineux disposés très proches les uns des autres, voire accolés, dans une direction horizontale.In the first place, such a system, because of the use of several light guides necessarily spaced from one another, does not allow the formation of light segments arranged very close to each other, or even contiguous, in a horizontal direction.

En deuxième lieu, la production de l'élément optique primaire d'un tel système est difficilement industrialisable du fait de la présence de la pluralité de guides qui impose l'utilisation de procédés de production complexes et couteux pour former ces guides.Second, the production of the primary optical element of such a system is difficult to industrialize because of the presence of the plurality of guides that requires the use of complex and expensive production processes to form these guides.

Enfin, il est également important que chaque segment lumineux vertical éclaire de manière intense la route d'un côté vertical et présente une étendue importante de l'autre côté vertical de manière à améliorer la visibilité du conducteur du véhicule.Finally, it is also important that each vertical light segment intensively illuminates the road on one vertical side and has a large extent on the other vertical side so as to improve the visibility of the driver of the vehicle.

La présente invention a pour but de résoudre ces problèmes.The present invention aims to solve these problems.

L'invention a donc pour objet un élément optique primaire pour module lumineux de véhicule automobile, comprenant un unique organe d'entrée monobloc et une partie correctrice, l'organe d'entrée présentant au moins une face d'entrée destinée à recevoir de la lumière, l'organe d'entrée étant relié en sortie à la partie correctrice, la partie correctrice comportant une face de sortie de lumière au moins en partie en forme de dôme sensiblement sphérique, l'organe d'entrée et la partie correctrice formant une structure monobloc, caractérisé en ce que un profil vertical de la face d'entrée de l'organe d'entrée présente, notamment sur toute sa surface, une première partie convexe et une deuxième partie plane ou concave.The subject of the invention is therefore a primary optical element for a motor vehicle light module, comprising a single one-piece input member and a corrective part, the input member having at least one input face intended to receive the light, the input member being connected at the output to the corrective part, the corrective part comprising an output face of at least partly dome-shaped substantially spherical light, the input member and the corrective portion forming a one-piece structure, characterized in that a vertical profile of the input face of the input member has, in particular over its entire surface, a first convex part and a second flat or concave part.

On entend par les termes « profil vertical de la face d'entrée » le profil de la face d'entrée dans une section de cette face d'entrée par un plan vertical contenant un axe optique de l'élément optique primaire lors d'une utilisation normale de l'élément optique primaire, par exemple lorsque le module lumineux est monté dans le véhicule automobile.The term "vertical profile of the input face" is understood to mean the profile of the input face in a section of this input face by a vertical plane containing an optical axis of the primary optical element during a normal use of the primary optical element, for example when the light module is mounted in the motor vehicle.

Ainsi grâce à l'invention, il est possible d'utiliser des sources de lumière, ou de créer à la zone de sortie de l'organe d'entrée des sources de lumière secondaires, qui soient disposées suffisamment proches les unes des autres de manière à pouvoir former des segments verticaux de lumière quasiment accolés.Thus, thanks to the invention, it is possible to use light sources, or to create secondary light sources at the output area of the input member, which are arranged sufficiently close to one another to be able to form vertical segments of light almost contiguous.

De plus, la présence d'un unique organe d'entrée monobloc permet de faciliter l'industrialisation de la production d'un tel élément optique primaire.In addition, the presence of a single monobloc input member facilitates the industrialization of the production of such a primary optical element.

Enfin, la première partie convexe du profil vertical de la face d'entrée est conformée pour que, lorsqu'une source de lumière est placée en regard de cette face d'entrée pour former un segment lumineux vertical, des rayons lumineux émis par cette source pénètrent dans l'élément optique primaire via la première partie convexe, sortent de l'élément optique primaire via la face de sortie de la partie correctrice et sont concentrés d'un côté du segment lumineux vertical. La deuxième partie concave ou plane est conformée pour que d'autres rayons lumineux émis par cette source pénètrent dans l'élément optique primaire via la deuxième partie plane ou concave, sortent de l'élément optique primaire via la face de sortie de la partie correctrice et sont ainsi étalés vers l'autre côté du segment lumineux vertical.Finally, the first convex portion of the vertical profile of the input face is shaped so that, when a light source is placed opposite this input face to form a vertical light segment, light rays emitted by this source penetrate into the primary optical element via the first convex portion, exit the primary optical element via the output face of the corrective portion and are concentrated on one side of the vertical light segment. The second concave or flat part is shaped so that other light rays emitted by this source penetrate into the primary optical element via the second flat or concave part, and leave the primary optical element via the exit face of the corrective part. and are thus spread to the other side of the vertical light segment.

En outre, à la sortie de la partie correctrice, les rayons lumineux ne sont pas ou peu déviés grâce à la forme de dôme sensiblement sphérique de la face de sortie de cette partie correctrice.In addition, at the exit of the corrective part, the light rays are not or little deviated due to the substantially spherical dome shape of the output face of this corrective part.

Ainsi, la distribution vertical du segment lumineux vertical est telle que la lumière soit très concentrée d'un côté du segment et soit étalée vers l'autre côté du segment.Thus, the vertical distribution of the vertical light segment is such that the light is highly concentrated on one side of the segment and is spread towards the other side of the segment.

On notera que les termes « l'organe d'entrée étant relié en sortie à la partie correctrice » signifient que l'organe d'entrée est agencé pour que de la lumière reçu par l'organe d'entrée débouche dans la partie correctrice au niveau d'une zone de sortie de l'organe d'entrée, cette zone de sortie étant disposée au niveau de la jonction entre l'organe d'entrée et la partie correctrice. Cette zone de sortie peut être plane ou courbe.It should be noted that the terms "the input member being outputly connected to the correcting portion" mean that the input member is arranged so that light received by the input member opens into the correcting portion of the input level of an output area of the input member, this output area being disposed at the junction between the input member and the corrective part. This exit zone may be flat or curved.

On notera également que par « dôme sensiblement sphérique », on entend désigner une surface dont la forme épouse au moins partiellement celle d'une sphère. En d'autres termes, la partie correctrice est délimitée au moins par une face de sortie présentant au moins une portion sphérique.Note also that "substantially spherical dome" means a surface whose shape at least partially matches that of a sphere. In other words, the corrective part is defined at least by an exit face having at least one spherical portion.

Avantageusement, les indices de réfraction respectifs de l'organe d'entrée et de la partie correctrice sont sensiblement identiques.Advantageously, the respective refractive indices of the input member and the corrective part are substantially identical.

Par « sensiblement identiques », on entend désigner des indices de réfraction égaux au centième près. Ainsi, à la zone de sortie de l'organe d'entrée, les rayons ne subissent pas ou quasiment pas de réfraction.By "substantially identical" is meant refractive indices equal to one hundredth. Thus, at the exit zone of the input member, the rays undergo no or almost no refraction.

Par exemple, l'organe d'entrée et la partie correctrice peuvent fabriqués dans un même matériau. Le cas échéant, l'organe d'entrée et la partie correctrice sont issus d'un même polymère, par exemple en méthacrylate de polyméthyle.For example, the input member and the corrective portion may be made of the same material. If necessary, the input member and the corrective part come from the same polymer, for example polymethyl methacrylate.

De préférence, la face de sortie en forme de dôme sensiblement sphérique est centrée sensiblement au niveau de la zone sortie de l'organe d'entrée, notamment au centre de cette zone de sortie.Preferably, the substantially spherical dome-shaped exit face is centered substantially at the exit zone of the input member, in particular in the center of this exit zone.

Si on le souhaite, la partie correctrice peut avoir sensiblement la forme d'une demi-sphère.If desired, the corrective portion may be substantially in the shape of a half-sphere.

Dans un premier mode de réalisation de l'invention, la face d'entrée présente, notamment sur toute sa surface, un profil horizontal rectiligne.In a first embodiment of the invention, the input face has, in particular over its entire surface, a straight horizontal profile.

On entend par les termes « profil horizontal de la face d'entrée » le profil de la face d'entrée dans une section de cette face d'entrée par un plan perpendiculaire à l'axe optique de l'élément optique primaire lors d'une utilisation normale de l'élément optique primaire, par exemple lorsque le module lumineux est monté dans le véhicule automobileThe term "horizontal profile of the input face" is intended to mean the profile of the input face in a section of this input face by a plane perpendicular to the optical axis of the primary optical element when a use normal of the primary optical element, for example when the light module is mounted in the motor vehicle

Avantageusement, l'organe d'entrée présente une forme cylindrique présentant une génératrice et une directrice. En d'autres termes, l'organe d'entrée présente une forme obtenue par translation de la génératrice le long de la directrice.Advantageously, the input member has a cylindrical shape having a generator and a director. In other words, the input member has a shape obtained by translation of the generator along the director.

De préférence, l'élément optique primaire présentant un axe optique, ladite directrice est un segment de droite perpendiculaire à l'axe optique. Dans ce cas, la directrice correspond au profil horizontal de la face d'entrée.Preferably, the primary optical element having an optical axis, said director is a line segment perpendicular to the optical axis. In this case, the director corresponds to the horizontal profile of the input face.

Avantageusement, l'organe d'entrée présente une face supérieure de réflexion présentant un profil vertical convexe. Par exemple, la face supérieur peut comporter une portion d'ellipse. La face supérieure s'étend depuis la face d'entrée, notamment depuis la première partie convexe de la face d'entrée, jusqu'à la partie correctrice.Advantageously, the input member has an upper reflection face having a convex vertical profile. For example, the upper face may comprise an ellipse portion. The upper face extends from the entry face, in particular from the first convex portion of the entry face, to the corrective portion.

Cette face supérieure de réflexion de profil vertical convexe est conformée pour que des rayons de lumière émis par la source, pénétrant dans l'organe d'entrée et atteignant cette face supérieure soient réfléchis, par réflexion interne totale, par cette face supérieure vers la face de sortie et contribuent à la concentration de la lumière d'un côté du segment.This convex vertical profile reflection upper face is shaped so that rays of light emitted by the source, penetrating into the input member and reaching this upper face, are reflected, by total internal reflection, by this upper face towards the face. output and contribute to the concentration of light on one side of the segment.

Avantageusement, l'organe d'entrée présente une face inférieure d'étalement plane. La face inférieure s'étend depuis la face d'entrée, notamment depuis la partie concave ou plane de la face d'entrée, jusqu'à la partie correctrice.Advantageously, the input member has a flat bottom spreading face. The lower face extends from the input face, in particular from the concave or flat part of the input face, to the corrective part.

Cette face inférieure d'étalement plane est conformée de manière à élargir la section verticale de l'organe d'entrée de sa face d'entrée jusqu'à la zone de sortie. Cet élargissement de l'organe d'entrée contribue à l'étalement de la lumière de l'autre côté du segment.This flat bottom spreading face is shaped so as to widen the vertical section of the input member from its inlet face to the exit zone. This enlargement of the input member contributes to the spread of light on the other side of the segment.

De préférence, les faces supérieures et inférieures sont disposées de manière jointive de part et d'autre de la face d'entrée. La génératrice de l'organe d'entrée est ainsi formée par le profil convexe de la face supérieure, le profil de la face d'entrée et le profil plan de la face inférieure.Preferably, the upper and lower faces are arranged contiguously on either side of the input face. The generatrix of the input member is thus formed by the convex profile of the upper face, the profile of the input face and the plane profile of the lower face.

Si on le souhaite, l'organe d'entrée présente deux faces latérales, s'étendant entre des arêtes latérales des faces supérieure et inférieure et depuis la face d'entrée jusqu'à la partie correctrices.If desired, the input member has two side faces, extending between side edges of the upper and lower faces and from the input face to the corrective portion.

Dans un deuxième mode de réalisation de l'invention, la face d'entrée présente, notamment sur toute sa surface, un profil horizontal ondulé.In a second embodiment of the invention, the input face has, particularly over its entire surface, a corrugated horizontal profile.

Le cas échéant, le profil horizontal de la face d'entrée peut présenter, notamment sur tout son long, une succession de portions convexe accolées une à une.Where appropriate, the horizontal profile of the entrance face may have, especially along its length, a succession of convex portions contiguous one by one.

Chaque portion convexe est agencée pour que, lorsqu'une source de lumière est disposée en face d'une portion convexe et qu'un rayon émis par cette source de lumière atteint une autre portion convexe adjacente, la portion convexe adjacente réfracte ce rayon vers la face de sortie de la partie correctrice selon une direction donnée, de manière à ce que ce rayon ne soit pas émis par le module lumineux.Each convex portion is arranged so that, when a light source is disposed opposite a convex portion and a ray emitted by this light source reaches another adjacent convex portion, the adjacent convex portion refracts this ray toward the output side of the corrective part in a given direction, so that this ray is not emitted by the light module.

Le cas échéant, les portions convexes du profil horizontale peuvent présenter un même profil, notamment sphérique.Where appropriate, the convex portions of the horizontal profile may have the same profile, in particular spherical.

Avantageusement, l'organe d'entrée présente une face supérieure plane. Dans ce cas, la face supérieure s'étend de la face d'entrée, notamment depuis la partie convexe de la face d'entrée, jusqu'à la partie correctrice.Advantageously, the input member has a planar upper face. In this case, the upper face extends from the input face, in particular from the convex portion of the input face, to the corrective portion.

Si on le souhaite, la partie concave ou plane de la face d'entrée s'étend jusqu'à la partie correctrice.If desired, the concave or planar portion of the entrance face extends to the corrective portion.

L'invention a également pour objet un module lumineux, notamment d'éclairage de la route, de véhicule automobile, comprenant une pluralité de sources de lumière, par exemple quatre sources de lumière, un élément optique primaire selon l'invention apte à recevoir les rayons de lumière émis par les sources de lumière et un élément optique secondaire, l'optique secondaire étant agencée pour recevoir des rayons lumineux sortant de la face de sortie de la partie correctrice de l'élément optique primaire et pour projeter ces rayons dans une région de la route située devant le module lumineux.The subject of the invention is also a light module, in particular for illuminating the road, of a motor vehicle, comprising a plurality of light sources, for example four light sources, a primary optical element according to the invention adapted to receive the rays of light emitted by the light sources and a secondary optical element, the secondary optics being arranged to receive light rays issuing from the output face of the corrective part of the primary optical element and to project these rays in a region from the road in front of the light module.

L'élément optique secondaire est de préférence distinct de l'élément optique primaire, notamment disposée à distance devant l'élément optique primaire le long de l'axe optique de l'élément optique primaire.The secondary optical element is preferably distinct from the primary optical element, in particular arranged at a distance from the primary optical element along the optical axis of the primary optical element.

Avantageusement, l'élément optique secondaire est une lentille de projection.Advantageously, the secondary optical element is a projection lens.

Si on le souhaite, la lentille de projection présente une face avant et une face arrière et comporte des éléments diffusants, par exemple des tores, sur sa face avant et/ou sa face arrière.If desired, the projection lens has a front face and a rear face and comprises diffusing elements, for example tori, on its front face and / or its rear face.

En variante, l'élément optique secondaire peut être un réflecteur.Alternatively, the secondary optical element may be a reflector.

En variante encore, l'élément optique secondaire peut être un système de projection comportant une pluralité de lentilles et/ou de réflecteurs.In another variant, the secondary optical element may be a projection system comprising a plurality of lenses and / or reflectors.

De préférence, chaque source est un élément semi-conducteur électroluminescent.Preferably, each source is an electroluminescent semiconductor element.

Le cas échéant, toutes les sources peuvent être disposées en une unique rangée de sources, notamment sous la forme d'une LED multipuces, chaque source étant activable pour l'émission de rayons de lumière indépendamment des autres sources. Dans ce cas, chaque puce de la LED multipuces forme ainsi une source de lumière, toutes les sources étant disposées très proches les unes des autres. Par exemple, la distance entre deux sources voisines peut être inférieure à 0,5 mm.Where appropriate, all the sources can be arranged in a single row of sources, especially in the form of a multi-chip LED, each source being activatable for the emission of light rays independently of other sources. In this case, each chip of the multi-chip LED thus forms a light source, all sources being arranged very close to each other. For example, the distance between two neighboring sources may be less than 0.5 mm.

Selon un mode de réalisation du module lumineux selon l'invention, l'élément optique primaire étant conforme au premier mode de réalisation décrit ci-dessus, l'élément optique secondaire présente une surface de focalisation horizontale et une surface de focalisation verticale.According to one embodiment of the light module according to the invention, the primary optical element being in accordance with the first embodiment described above, the secondary optical element has a horizontal focusing surface and a vertical focusing surface.

On entend par surface de focalisation horizontale une surface définie par un ensemble de points tels que, tous les rayons émis par une source disposée à l'un de ces points sont dirigés par l'élément optique secondaire de manière à ce qu'ils sortent du module lumineux parallèles entre eux, dans un plan contenant une droite horizontale perpendiculaire à l'axe optique de l'élément optique secondaire.By horizontal focusing surface is meant a surface defined by a set of points such that all the rays emitted by a source disposed at one of these points are directed by the secondary optical element so that they exit the luminous module parallel to each other, in a plane containing a horizontal line perpendicular to the optical axis of the secondary optical element.

On entend par surface de focalisation verticale une surface définie par un ensemble de points tels que, tous les rayons émis par une source disposée à l'un de ces points sont dirigés par l'élément optique secondaire de manière à ce qu'ils sortent du module lumineux parallèles entre eux, dans un plan contenant une droite verticale perpendiculaire à l'axe optique de l'élément optique secondaire.By vertical focusing surface is meant a surface defined by a set of points such that all the rays emitted by a source disposed at one of these points are directed by the secondary optical element so that they exit the light module parallel to each other, in a plane containing a vertical line perpendicular to the optical axis of the secondary optical element.

De préférence, l'axe optique de l'élément optique secondaire est confondu avec l'axe optique de l'élément optique primaire.Preferably, the optical axis of the secondary optical element coincides with the optical axis of the primary optical element.

Avantageusement, la surface de focalisation horizontale de l'élément optique secondaire passe par toutes les surfaces d'émissions des sources de lumière. Le cas échéant, les surfaces d'émissions des sources de lumière peuvent être disposées sur une droite horizontale perpendiculaire à l'axe optique de l'élément optique secondaire. Ainsi, pour chaque source de lumière, les rayons émis d'un point de cette source, disposé sur ladite droite horizontale, traversent l'élément optique primaire et sont projetés par l'élément optique secondaire parallèlement à l'axe optique. Par conséquent, la largeur horizontale du segment lumineux formé par cette source de lumière est directement liée, notamment de façon proportionnelle, à la largeur de ladite source, ce qui permet de créer un segment lumineux de largeur particulièrement fine. Par exemple, l'optique secondaire peut présenter un grandissement, la largeur du segment lumineux étant égale à la largeur de la source de lumière multipliée par ce grandissement.Advantageously, the horizontal focusing surface of the secondary optical element passes through all the emission surfaces of the light sources. Where appropriate, the emission surfaces of the light sources may be arranged on a horizontal line perpendicular to the optical axis of the secondary optical element. Thus, for each light source, the rays emitted from a point of this source, disposed on said horizontal line, pass through the primary optical element and are projected by the secondary optical element parallel to the optical axis. Consequently, the horizontal width of the light segment formed by this light source is directly related, in particular proportionally, to the width of said source, which makes it possible to create a light segment of particularly fine width. For example, the secondary optics may be magnified, the width of the light segment being equal to the width of the light source multiplied by this magnification.

Avantageusement, la zone de sortie de l'organe d'entrée est confondue avec la surface de focalisation verticale de l'élément optique secondaire. De cette façon, l'organe d'entrée crée sur la zone de sortie des sources secondaires dont la distribution verticale est telle que la lumière soit très concentrée d'un côté de cette source et soit étalée vers l'autre côté de cette source. Les rayons de chaque source secondaire sont ensuite projetés par l'élément optique secondaire, parallèles entre eux dans un plan vertical, ce qui permet de créer un segment lumineux présentant cette même distribution verticale.Advantageously, the exit zone of the input member coincides with the vertical focusing surface of the secondary optical element. In this way, the input member creates on the output zone secondary sources whose vertical distribution is such that the light is very concentrated on one side of this source and is spread towards the other side of this source. The rays of each secondary source are then projected by the secondary optical element, parallel to each other in a vertical plane, which allows to create a light segment having the same vertical distribution.

Selon un autre mode de réalisation du module lumineux selon l'invention, l'élément optique primaire étant conforme au deuxième mode de réalisation décrit ci-dessus, l'élément optique secondaire présente une surface de focalisation unique.According to another embodiment of the light module according to the invention, the primary optical element being in accordance with the second embodiment described above, the secondary optical element has a single focusing surface.

Le cas échéant, la zone de sortie de l'organe d'entrée est confondue avec la surface de focalisation de l'élément optique secondaire.If necessary, the output zone of the input member is coincident with the focusing surface of the secondary optical element.

De cette façon, l'organe d'entrée crée sur la zone de sortie des sources secondaires dont la distribution verticale est telle que la lumière soit très concentrée d'un côté de cette source et soit étalée vers l'autre côté de cette source. Les rayons de chaque source secondaire sont ensuite projetés par l'élément optique secondaire, parallèles entre eux dans un plan vertical, ce qui permet de créer un segment lumineux présentant cette même distribution verticale.In this way, the input member creates on the output zone secondary sources whose vertical distribution is such that the light is very light. concentrated on one side of this source and spread to the other side of this source. The rays of each secondary source are then projected by the secondary optical element, parallel to each other in a vertical plane, which allows to create a light segment having the same vertical distribution.

Par ailleurs, le profil horizontal de la face d'entrée présentant, notamment sur toute sa longueur, une succession de portions convexe accolées une à une, les sources de lumière sont disposés en face de chaque portion convexe.Furthermore, the horizontal profile of the input face having, especially over its entire length, a succession of convex portions contiguous one by one, the light sources are arranged in front of each convex portion.

Ainsi, lorsqu'une source de lumière est disposée en face d'une portion convexe et qu'un rayon émis par cette source de lumière atteint une autre portion convexe adjacente, la portion convexe adjacente réfracte ce rayon vers la face de sortie de la partie correctrice selon une direction donnée, de manière à ce que ce rayon soit dirigé en dehors de l'élément optique secondaire. Par conséquent, la largeur du segment lumineux formé par une source de lumière est directement liée, notamment de façon proportionnelle, à la largeur de la portion convexe devant laquelle est placée ladite source de lumière.Thus, when a light source is disposed opposite a convex portion and a ray emitted by this light source reaches another adjacent convex portion, the adjacent convex portion refracts this ray towards the exit face of the portion correction in a given direction, so that this ray is directed outside the secondary optical element. Consequently, the width of the light segment formed by a light source is directly related, in particular proportionally, to the width of the convex portion in front of which said light source is placed.

Par exemple, l'optique secondaire peut présenter un grandissement, la largeur du segment lumineux étant égale à la largeur de la portion convexe multipliée par ce grandissement.For example, the secondary optics may have a magnification, the width of the light segment being equal to the width of the convex portion multiplied by this magnification.

L'invention concerne encore un projecteur de véhicule automobile, caractérisé en ce qu'il comprend au moins un module lumineux tel que précédemment défini, notamment plusieurs modules lumineux.The invention also relates to a motor vehicle headlight, characterized in that it comprises at least one light module as previously defined, including several light modules.

On va maintenant décrire différentes formes de réalisation de l'invention, en référence aux dessins annexés sur lesquels :

  • la figure 1 représente une vue en perspective d'un module lumineux, selon un mode de réalisation de l'invention ;
  • la figure 2 représente une vue latérale du module de la figure 1 ;
  • la figure 3 représente une vue de dessus du module de la figure 1 ;
  • la figure 4 représente une vue en perspective d'un module lumineux selon un autre mode de réalisation de l'invention ;
  • la figure 5 représente une vue latérale du module de la figure 1 ; et
  • la figure 6 représente une vue de dessus du module de la figure 1.
Various embodiments of the invention will now be described with reference to the accompanying drawings in which:
  • the figure 1 represents a perspective view of a light module, according to one embodiment of the invention;
  • the figure 2 represents a side view of the module of the figure 1 ;
  • the figure 3 represents a top view of the module of the figure 1 ;
  • the figure 4 represents a perspective view of a light module according to another embodiment of the invention;
  • the figure 5 represents a side view of the module of the figure 1 ; and
  • the figure 6 represents a top view of the module of the figure 1 .

D'emblée on notera que, par souci de clarté, les éléments correspondants représentés sur différentes figures portent les mêmes références, sauf indication contraire.From the outset it will be noted that, for the sake of clarity, the corresponding elements shown in different figures bear the same references, unless otherwise indicated.

Un repère tridimensionnel orthogonal est également représenté sur la figure 1, l'axe z correspondant à la verticale.An orthogonal three-dimensional coordinate system is also represented on the figure 1 , the z axis corresponding to the vertical.

Les figures 1 à 3 représentent un module lumineux 1, en position opérationnelle, destiné à équiper un projecteur de véhicule automobile, selon un premier mode de réalisation. Les figures 1, 2 et 3 représentent respectivement une vue en perspective, une vue latérale, selon la direction XX', et une vue de dessus, selon la direction ZZ', du module lumineux.The Figures 1 to 3 represent a light module 1, in operational position, intended to equip a motor vehicle headlamp, according to a first embodiment. The Figures 1, 2 and 3 respectively represent a perspective view, a side view, in the direction XX ', and a view from above, in the direction ZZ', of the light module.

Le module lumineux 1 comprend :

  • une pluralité de sources de lumière, référencées 1a-1d ;
  • un élément optique primaire 2 et
  • un élément optique secondaire 5, ayant un axe optique 6.
The light module 1 comprises:
  • a plurality of light sources, referenced 1a-1d;
  • a primary optical element 2 and
  • a secondary optical element 5, having an optical axis 6.

Chaque source 1 a-1 d est un élément semi-conducteur électroluminescent, formée par une puce d'une LED multipuce. Chaque source est activable pour l'émission de rayons de lumière indépendamment des autres sources.Each source 1 a-1 d is an electroluminescent semiconductor element formed by a chip of a multi-chip LED. Each source is activatable for the emission of light rays independently of other sources.

L'élément optique primaire 2 comprend un unique organe d'entrée de lumière monobloc 3 et une partie correctrice 4. L'organe d'entrée 3 est relié au niveau d'une zone de sortie 3a à la partie correctrice 4, le tout formant une structure monobloc. Par « structure monobloc », on entend signifier que les éléments de la structure (ici l'organe d'entrée 3 et la partie correctrice 4) ne sont pas séparables sans destruction de l'un au moins des éléments.The primary optical element 2 comprises a single monobloc light input member 3 and a corrective part 4. The input member 3 is connected at the level of an exit zone 3a to the corrective part 4, the whole forming a monobloc structure. By "monobloc structure" is meant that the elements of the structure (here the input member 3 and the corrective part 4) are not separable without destruction of at least one of the elements.

La partie correctrice 4 est une portion de sphère, ou une portion de boule, centrée sur la zone de sortie 3a. Plus précisément, la partie correctrice 4 est une demi-boule dont le centre est situé dans la zone de sortie 3a et sur l'axe optique 6. La surface avant 4a de la partie correctrice 4, en forme de dôme sphérique ou portion sphérique, constitue une face avant de sortie. L'arrière 4b de la partie correctrice 4 s'étend ici dans le plan de coupe de la demi-sphère.The corrective part 4 is a sphere portion, or a ball portion, centered on the exit zone 3a. More precisely, the corrective part 4 is a half-ball whose center is situated in the exit zone 3a and on the optical axis 6. The front surface 4a of the corrective part 4, in the form of a spherical dome or a spherical portion, constitutes an exit front face. The rear 4b of the corrective part 4 extends here in the cutting plane of the half-sphere.

L'organe d'entrée 3 et la partie correctrice 4 sont fabriqués dans un même matériau transparent, par exemple en méthacrylate de polyméthyle, et ont un même indice de réfraction.The input member 3 and the corrective part 4 are made of the same transparent material, for example polymethyl methacrylate, and have the same refractive index.

L'organe d'entrée 3 présente une forme cylindrique et comporte

  • une face 31 d'entrée de la lumière ;
  • une zone de sortie 3a ;
  • deux faces latérales 3b;
  • une face supérieure 3c;
  • une face inférieure 3d.
The input member 3 has a cylindrical shape and comprises
  • a face 31 of entry of the light;
  • an exit zone 3a;
  • two lateral faces 3b;
  • an upper face 3c;
  • a lower face 3d.

Par souci de clarté, certaines références de faces de guide ne sont pas reportées sur les figures, afin de ne pas les surcharger.For the sake of clarity, some references of guide faces are not shown in the figures, so as not to overload them.

La face d'entrée 31 présente :

  • verticalement, un profil vertical comportant, sur toute sa surface, une première partie convexe 31 a et une deuxième partie concave 31 b.
  • horizontalement, un profil horizontal rectiligne.
The entry face 31 has:
  • vertically, a vertical profile having, over its entire surface, a first convex portion 31a and a second concave portion 31b.
  • horizontally, a straight horizontal profile.

La face supérieure 3c est une face supérieure de réflexion 3c présentant sur toute sa surface un profil vertical convexe comportant une portion d'ellipse, s'étendant depuis la face d'entrée 31 jusqu'à l'arrière 4b de la partie correctrice 4.The upper face 3c is an upper reflection face 3c having over its entire surface a convex vertical profile comprising an ellipse portion, extending from the input face 31 to the rear 4b of the corrective portion 4.

La face inférieure 3d est une face inférieure d'étalement 3d plane s'étendant depuis la face d'entrée 31 jusqu'à l'arrière 4b de la partie correctrice.The lower face 3d is a lower plane 3d spreading surface extending from the input face 31 to the rear 4b of the corrective part.

Les profils verticaux des faces supérieure 3c, d'entrée 31 et inférieure 3d forment ainsi une génératrice de l'organe d'entrée 3, l'organe d'entrée 3 étant alors formée par une translation de cette génératrice le long du profil rectiligne de la face d'entrée 31.The vertical profiles of the upper faces 3c, input 31 and lower 3d thus form a generatrix of the input member 3, the input member 3 then being formed by a translation of this generator along the straight profile of the entrance face 31.

La première partie convexe 31a du profil vertical de la face d'entrée 31 est conformée pour que les rayons lumineux émis par les sources 1a-1d et pénétrant dans l'élément optique primaire 3 via la première partie convexe 31 a, débouchent dans la partie correctrice 4 au niveau de la zone de sortie 3a dans une zone verticalement concentrée. La deuxième partie concave 31 b est conformée pour que les rayons lumineux émis par ces sources 1a-1d et pénétrant dans l'élément optique primaire 3 via la deuxième partie concave 31 b débouchent dans la partie correctrice 4 au niveau de la zone de sortie 3a dans une zone verticalement étalée. Avantageusement, l'axe optique 6 de l'élément optique secondaire 5 passe par la zone verticalement concentrée.The first convex portion 31a of the vertical profile of the input face 31 is shaped so that the light rays emitted by the sources 1a-1d and penetrating into the primary optical element 3 via the first convex portion 31a, open into the part corrector 4 at the exit zone 3a in a vertically concentrated zone. The second concave part 31b is shaped so that the light rays emitted by these sources 1a-1d and penetrating into the primary optical element 3 via the second concave part 31b open into the corrective part 4 at the exit zone 3a. in a vertically spread zone. Advantageously, the optical axis 6 of the secondary optical element 5 passes through the vertically concentrated zone.

La face supérieure de réflexion 3c est conformée pour que des rayons de lumière émis par les sources 1a-1d, pénétrant dans l'organe d'entrée 3 et atteignant cette face supérieure 3c soient réfléchis, par réflexion interne totale, par cette face supérieure 3c de manière à ce qu'ils débouchent dans la partie correctrice 4 au niveau de la zone de sortie 3a dans ladite zone verticalement concentrée.The upper reflection face 3c is shaped so that rays of light emitted by the sources 1a-1d, penetrating into the input member 3 and reaching this upper face 3c are reflected, by total internal reflection, by this upper face 3c so that they open into the corrective portion 4 at the exit zone 3a in said vertically concentrated zone.

La face inférieure d'étalement 3d est conformée de manière à élargir la section verticale de l'organe d'entrée 3 de sa face d'entrée 31 jusqu'à la zone de sortie 3a de manière à ce que tous les rayons traversant la deuxième partie concave 31 b débouchent dans ladite zone verticalement étalée sans rencontrer d'obstacle sur leur trajet.The lower spreading face 3d is shaped so as to widen the vertical section of the input member 3 from its inlet face 31 to the exit zone 3a so that all the spokes passing through the second concave portion 31b open into said vertically spread zone without encountering obstacle on their way.

L'organe d'entrée présente une largeur, mesurée selon la direction XX', suffisante pour qu'aucun des rayons émis par les sources de lumière 1a-1d ne rencontre les faces latérales 3b.The input member has a width, measured in the direction XX ', sufficient for none of the rays emitted by the light sources 1a-1d to meet the side faces 3b.

Le rôle de la partie correctrice 4, en coopération avec l'organe d'entrée 3, est double.The role of the corrective part 4, in cooperation with the input member 3, is twofold.

Elle permet d'une part d'améliorer l'efficacité optique du module lumineux. L'organe d'entrée a pour effet de réduire l'ouverture des rayons lumineux émis par les sources 1 a-1 d, les rayons pénétrant dans l'organe étant rabattus par les lois de la réfraction. En outre, au niveau de la zone de sortie 3a, les rayons lumineux ne sont pas déviés en raison de la connexion entre l'organe d'entrée 3 et la partie correctrice 4. Grâce à cela, l'ouverture réduite des rayons est conservée. Enfin, les rayons lumineux sortant de la partie correctrice 4 par la face de sortie 4a ne sont pas ou peu déviés grâce à la forme de dôme sphéroïdal de la face de sortie 4a. En effet, la partie correctrice demi-sphérique 4 étant centrée sur la zone de sortie 3a, un rayon provenant de cette zone de sortie 3a au niveau de l'axe optique 6 est normal ou quasiment normal à la face de sortie 4a et n'est par conséquent pas dévié à l'interface entre la partie correctrice 4 et l'air environnant. Un rayon provenant d'une zone écartée de l'axe optique 6 est rabattu vers cet axe optique 6. La réfraction à l'interface entre la partie correctrice 4 et le milieu environnant (air) est en quelque sorte « compensée » par la forme sphérique, ou sensiblement sphérique, de la face de sortie 4a.On the one hand, it improves the optical efficiency of the light module. The input member has the effect of reducing the opening of the light rays emitted by the sources 1a-1d, the rays entering the body being folded by the laws of refraction. In addition, at the exit zone 3a, the light rays are not deflected due to the connection between the input member 3 and the corrective part 4. Thanks to this, the reduced opening of the rays is maintained. . Finally, the light rays coming out of the corrective part 4 by the exit face 4a are not or little deviated thanks to the spheroidal dome shape of the exit face 4a. Indeed, the half-spherical corrective part 4 being centered on the exit zone 3a, a ray coming from this exit zone 3a at the level of the optical axis 6 is normal or almost normal to the exit face 4a and n ' is therefore not diverted to the interface between the corrective part 4 and the surrounding air. A ray originating from an area remote from the optical axis 6 is folded towards this optical axis 6. The refraction at the interface between the corrective part 4 and the surrounding medium (air) is in a way "compensated" by the shape spherical, or substantially spherical, of the exit face 4a.

La partie correctrice 4 permet d'autre part de corriger les aberrations de champ du système optique et d'assurer ainsi une imagerie de bonne qualité, comme cela sera davantage explicité plus loin.The corrective part 4 also makes it possible to correct the field aberrations of the optical system and thus ensure good quality imaging, as will be explained further later.

L'élément optique secondaire 5 est une lentille de projection disposée à distance devant l'élément optique primaire 3 le long de l'axe optique 6.The secondary optical element 5 is a projection lens disposed remotely in front of the primary optical element 3 along the optical axis 6.

L'élément optique secondaire 5 présente une surface de focalisation horizontale 5a et une surface de focalisation verticale 5b.The secondary optical element 5 has a horizontal focusing surface 5a and a vertical focusing surface 5b.

La surface de focalisation horizontale 5a de l'élément optique secondaire 4 passe par toutes les surfaces d'émissions des sources de lumière 1a-1d.The horizontal focusing surface 5a of the secondary optical element 4 passes through all the emission surfaces of the light sources 1a-1d.

Ainsi, pour chaque source de lumière 1 a-1 d, les rayons émis d'un point de cette source traversent l'élément optique primaire 3 et sont projetés par l'élément optique secondaire 5 parallèlement à l'axe optique 6. Par conséquent, chaque source est capable de former un segment lumineux dont la largeur horizontale est directement liée à la largeur de ladite source, ce qui permet de créer un segment lumineux de forme globalement rectangulaire et de largeur particulièrement fine.Thus, for each light source 1 a-1 d, the rays emitted from a point of this source pass through the primary optical element 3 and are projected by the secondary optical element 5 parallel to the optical axis 6. , each source is capable of forming a light segment whose horizontal width is directly related to the width of said source, which allows to create a light segment of generally rectangular shape and particularly thin width.

La zone de sortie 3a de l'organe d'entrée 3 est confondue avec la surface de focalisation verticale 5b de l'élément optique secondaire. De cette façon, l'organe d'entrée 3 crée sur la zone de sortie 3a des sources secondaires dont la distribution verticale comprend lesdites zones verticalement concentrée et étalée. Les rayons de chaque source secondaire sont ensuite projetés par l'élément optique secondaire de manière parallèles entre eux dans un plan vertical, ce qui permet de créer un segment lumineux présentant une distribution verticale telle que la lumière soit très concentrée d'un côté du segment et soit étalée vers l'autre côté du segment.The exit zone 3a of the input member 3 coincides with the vertical focusing surface 5b of the secondary optical element. In this way, the input member 3 creates on the exit zone 3a secondary sources whose vertical distribution comprises said vertically concentrated and spread zones. The rays of each secondary source are then projected by the secondary optical element parallel to each other in a vertical plane, thereby creating a light segment having a vertical distribution such that light is highly concentrated on one side of the segment and is spread to the other side of the segment.

La forme de portion de boule de la partie correctrice 4 améliore l'imagerie dans le champ. On peut ainsi générer plusieurs segments lumineux, avec une bonne imagerie, à l'aide d'un même élément optique primaire 2 et à partir l'organe d'entrée de lumière 3, positionné autour de l'axe optique 6. La demi-boule 4, en modifiant légèrement l'orientation des rayons émis par la zone de sortie 3a qui sont décalées par rapport à l'axe optique 6, à l'interface de sortie 4a, a un effet correcteur de champ.The ball portion shape of the corrective portion 4 improves imaging in the field. One can thus generate several light segments, with good imaging, using a same primary optical element 2 and from the light input member 3, positioned around the optical axis 6. The half ball 4, slightly changing the orientation of the rays emitted by the output zone 3a which are offset with respect to the optical axis 6, at the output interface 4a, has a field corrector effect.

En référence aux figures 4 à 6, on va maintenant décrire une deuxième forme de réalisation du module lumineux. Seuls les éléments qui diffèrent de la première forme de réalisation sont décrits ci-après. Les figures 4, 5 et 6 représentent respectivement une vue en perspective, une vue latérale, selon la direction XX', et une vue de dessus, selon la direction ZZ', du module lumineux.With reference to Figures 4 to 6 a second embodiment of the light module will now be described. Only the elements that differ from the first embodiment are described below. The Figures 4, 5 and 6 respectively represent a perspective view, a side view, in the direction XX ', and a view from above, in the direction ZZ', of the light module.

Le module lumineux 1 comporte une pluralité de sources de lumière 1a-1g, uniquement représentées en figures 5 et 6.The light module 1 comprises a plurality of light sources 1a-1g, represented only in Figures 5 and 6 .

L'organe d'entrée 3 comporte

  • une face 31 d'entrée de la lumière ;
  • une zone de sortie 3a ;
  • deux faces latérales 3b; et
  • une face supérieure 3c.
The input member 3 comprises
  • a face 31 of entry of the light;
  • an exit zone 3a;
  • two lateral faces 3b; and
  • an upper face 3c.

Par souci de clarté, certaines références de l'organe d'entrée 3 ne sont pas reportées sur les figures, afin de ne pas les surcharger.For the sake of clarity, some references of the input member 3 are not shown in the figures, so as not to overload them.

La face d'entrée 31 présente :

  • verticalement, un profil vertical comportant, sur toute sa surface, une première partie convexe 31 a et une deuxième partie plane 31 b.
  • horizontalement, un profil horizontal ondulé.
The entry face 31 has:
  • vertically, a vertical profile having, over its entire surface, a first convex portion 31a and a second flat portion 31b.
  • horizontally, a corrugated horizontal profile.

Le profil horizontal de la face d'entrée 31 présente, sur toute sa longueur, une succession de portions convexe 31 c accolées une à une.The horizontal profile of the inlet face 31 has, over its entire length, a succession of convex portions 31c contiguous one by one.

Les portions convexes 31 c du profil horizontal présentent toutes un même profil, notamment sphérique.The convex portions 31c of the horizontal profile all have the same profile, in particular spherical.

Les sources de lumière sont disposées en face de chaque portion convexe 31 c.The light sources are disposed in front of each convex portion 31c.

La face supérieure 3c s'étend depuis la face d'entrée jusqu'à la partie arrière 4b de la partie correctrice 4.The upper face 3c extends from the inlet face to the rear part 4b of the corrective part 4.

La deuxième partie plane 31 b s'étend jusqu'à la partie arrière 4b de la partie correctrice 4.The second flat part 31b extends to the rear part 4b of the corrective part 4.

La deuxième partie plane 31 b est conformée de manière à élargir la section verticale de l'organe d'entrée 3 jusqu'à la zone de sortie 3a de manière à ce que tous les rayons traversant la deuxième partie plan 31 b débouchent dans une zone verticalement étalée sans rencontrer d'obstacle sur leur trajetThe second flat portion 31b is shaped so as to widen the vertical section of the input member 3 to the exit zone 3a so that all the rays passing through the second plane portion 31b open into a zone vertically spread without encountering obstacles on their way

Chaque portion convexe 31 c est agencée pour que, un rayon émis par la source de lumière disposée devant cette portion convexe 31 c atteint une autre portion convexe adjacente, la portion convexe adjacente réfracte ce rayon vers la face de sortie 4a de la partie correctrice 4 selon une direction donnée, de manière à ce que ce rayon soit dirigé en dehors de l'élément optique secondaire 5. L'organe d'entrée 3 crée donc au niveau de la zone de sortie 3a des sources secondaires dont la largeur est directement liée à la largeur des portions convexes 31 c et présentant verticalement des zones de concentration et des zones d'étalement.Each convex portion 31c is arranged so that, a ray emitted by the light source disposed in front of this convex portion 31c reaches another adjacent convex portion, the adjacent convex portion refracts this ray towards the exit face 4a of the corrective portion 4 in a given direction, so that this ray is directed outside the secondary optical element 5. The input member 3 therefore creates at the exit zone 3a secondary sources whose width is directly related the width of the convex portions 31c and vertically presenting concentration zones and spreading zones.

La lentille de projection 5 présente une surface de focalisation unique 5a, confondue avec la zone de sortie 3a. Les rayons de chaque source secondaire sont donc projetés par la lentille de projection 5, parallèles entre eux, ce qui permet de créer un segment lumineux de forme globalement rectangulaire, dont la largeur horizontal est directement liée à la largeur des portions convexes 31c et présentant une distribution verticale telle que la lumière soit très concentrée d'un côté du segment et soit étalée vers l'autre côté du segment.The projection lens 5 has a single focusing surface 5a, coinciding with the exit zone 3a. The radii of each secondary source are thus projected by the projection lens 5, parallel to each other, which makes it possible to create a luminous segment of generally rectangular shape, the horizontal width of which is directly related to the width of the convex portions 31c and presenting a vertical distribution such that the light is highly concentrated on one side of the segment and is spread towards the other side of the segment.

Claims (19)

Elément optique primaire (2) pour module lumineux de véhicule automobile, comprenant un unique organe d'entrée monobloc (3) et une partie correctrice (4), l'organe d'entrée présentant au moins une face d'entrée (31) destinée à recevoir de la lumière, l'organe d'entrée étant relié en sortie à la partie correctrice, la partie correctrice comportant une face de sortie de lumière (4a) au moins en partie en forme de dôme sensiblement sphérique, l'organe d'entrée et la partie correctrice formant une structure monobloc, caractérisé en ce que un profil vertical de la face d'entrée de l'organe d'entrée présente une première partie convexe (31 a) et une deuxième partie plane ou concave (31 b).Primary optical element (2) for a motor vehicle light module, comprising a single one-piece input member (3) and a corrective part (4), the input member having at least one input face (31) for receiving light, the input member being outputly connected to the correcting portion, the correcting portion having a light-emitting (4a) at least partially substantially spherical-shaped dome-shaped exit face, the input and the corrective portion forming a one-piece structure, characterized in that a vertical profile of the input face of the input member has a first convex portion (31 a) and a second planar or concave portion (31 b). . Elément optique primaire (2) selon la revendication précédente, dans lequel la partie correctrice (4) a sensiblement la forme d'une demi-sphère.Primary optical element (2) according to the preceding claim, wherein the corrective part (4) has substantially the shape of a hemisphere. Elément optique primaire (2) selon l'une des revendications précédentes, caractérisé en ce que la face d'entrée (31) présente un profil horizontal rectiligne.Primary optical element (2) according to one of the preceding claims, characterized in that the input face (31) has a straight horizontal profile. Elément optique primaire (2) selon l'une des revendications précédentes, caractérisé en ce que l'organe d'entrée (3) présente une forme cylindrique présentant une génératrice et une directrice.Primary optical element (2) according to one of the preceding claims, characterized in that the input member (3) has a cylindrical shape having a generatrix and a director. Elément optique primaire (2) selon l'une des revendications 3 ou 4, caractérisé en ce que l'organe d'entrée (3) présente une face supérieure de réflexion (3c) présentant un profil vertical convexe.Primary optical element (2) according to one of claims 3 or 4, characterized in that the input member (3) has an upper reflection face (3c) having a convex vertical profile. Elément optique primaire (2) selon l'une des revendications 3 à 5, caractérisé en ce que l'organe d'entrée (3) présente une face inférieure d'étalement plane (3d).Primary optical element (2) according to one of claims 3 to 5, characterized in that the input member (3) has a planar lower face (3d). Elément optique primaire (2) selon l'une des revendications 1 à 2, caractérisé en ce que la face d'entrée (31) présente un profil horizontal ondulé.Primary optical element (2) according to one of claims 1 to 2, characterized in that the input face (31) has a corrugated horizontal profile. Elément optique primaire (2) selon la revendication précédente, caractérisé en ce que le profil horizontal de la face d'entrée (31) présente une succession de portions convexe (31 c) accolées une à une.Primary optical element (2) according to the preceding claim, characterized in that the horizontal profile of the inlet face (31) has a succession of convex portions (31 c) contiguous one by one. Elément optique primaire (2) selon la revendication précédente, caractérisé en ce que les portions convexes (31 c) du profil horizontal présentent un même profil, notamment sphérique.Primary optical element (2) according to the preceding claim, characterized in that the convex portions (31c) of the horizontal profile have the same profile, in particular spherical. Elément optique primaire (2) selon l'une des revendications 7 à 9, caractérisé en ce que l'organe d'entrée (3) présente une face supérieure plane (3c).Primary optical element (2) according to one of claims 7 to 9, characterized in that the input member (3) has a flat upper face (3c). Module lumineux (1) de véhicule automobile, comprenant une pluralité de sources de lumière (1a-1d ; 1a-1g), un élément optique primaire (2) selon l'une des revendications 1 à 10 apte à recevoir les rayons de lumière émis par les sources de lumière et un élément optique secondaire (5), l'élément optique secondaire étant agencé pour recevoir des rayons lumineux sortant de la face de sortie (4a) de la partie correctrice (4) de l'élément optique primaire et pour projeter ces rayons dans une région de la route située devant le module lumineux.Motor vehicle light module (1), comprising a plurality of light sources (1a-1d; 1a-1g), a primary optical element (2) according to one of claims 1 to 10 adapted to receive the light rays emitted by the light sources and a secondary optical element (5), the secondary optical element being arranged to receive light rays issuing from the output face (4a) of the corrective part (4) of the primary optical element and for project these rays into a region of the road ahead of the light module. Module lumineux (1) selon la revendication précédente, caractérisé en ce que l'élément optique secondaire (5) est une lentille de projection.Light module (1) according to the preceding claim, characterized in that the secondary optical element (5) is a projection lens. Module lumineux (1) selon l'une des revendications 11 ou 12, caractérisé en ce que chaque source (1a-1d ; 1a-1g) est un élément semi-conducteur électroluminescent.Light module (1) according to one of claims 11 or 12, characterized in that each source (1a-1d; 1a-1g) is an electroluminescent semiconductor element. Module lumineux (1) selon la revendication précédente, l'élément optique primaire (2) étant un élément optique primaire selon l'une des revendications 3 à 6, caractérisé en ce que l'élément optique secondaire (5) présente une surface de focalisation horizontale (5a) et une surface de focalisation verticale (5b).Light module (1) according to the preceding claim, the primary optical element (2) being a primary optical element according to one of claims 3 to 6, characterized in that the secondary optical element (5) has a focusing surface horizontal (5a) and a vertical focusing surface (5b). Module lumineux (1) selon la revendication précédente, caractérisé en ce que la zone de sortie (3a) de l'organe d'entrée (3) est confondu avec la surface de focalisation verticale (5b) de l'élément optique secondaire (5).Light module (1) according to the preceding claim, characterized in that the output region (3a) of the input member (3) coincides with the vertical focusing surface (5b) of the secondary optical element (5). ). Module lumineux (1) selon l'une des revendications 14 ou 15, caractérisé en ce que la surface de focalisation horizontale (5a) de l'élément optique secondaire (5) passe par toutes les surfaces d'émissions des sources de lumière (1a-1d).Light module (1) according to one of Claims 14 or 15, characterized in that the horizontal focusing surface (5a) of the secondary optical element (5) passes through all the emission surfaces of the light sources (1a -1d). Module lumineux (1) selon l'une des revendications 11 à 13, l'élément optique primaire (2) étant un élément optique primaire selon l'une des revendications 7 à 10, caractérisé en ce que l'élément optique secondaire (5) présente une surface de focalisation unique (5a).Light module (1) according to one of Claims 11 to 13, the primary optical element (2) being a primary optical element according to one of Claims 7 to 10, characterized in that the secondary optical element (5) has a single focusing surface (5a). Module lumineux (1) selon la revendication précédente, caractérisé en ce que la zone de sortie (3a) de l'organe d'entrée (3) est confondu avec la surface de focalisation (5a) de l'élément optique secondaire (5).Light module (1) according to the preceding claim, characterized in that the output region (3a) of the input member (3) coincides with the focusing surface (5a) of the secondary optical element (5). . Projecteur de véhicule automobile, caractérisé en ce qu'il comprend au moins un module lumineux (1) selon l'une des revendications 11 à 18.Motor vehicle headlamp, characterized in that it comprises at least one light module (1) according to one of claims 11 to 18.
EP14191981.1A 2013-11-07 2014-11-06 Primary optical element, lighting module and headlight for motor vehicle Active EP2871406B1 (en)

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EP2871406B1 (en) 2018-05-30
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FR3012867A1 (en) 2015-05-08

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