FR3056691B1 - OPTICAL MODULE FOR A MOTOR VEHICLE PROJECTOR WITH ADAPTIVE LIGHTING FUNCTION, COMPRISING AN OPTICAL LIGHT BEAM REFLECTING SYSTEM - Google Patents

Abstract

The invention relates to an optical module (1) for a motor vehicle headlamp. The optical module (1) comprises at least one light source (3), at least one optical assembly (2) traversed by the light produced by the light source (3) to generate light rays (F1), and an optical element of projecting (6 ') towards the outside of a light beam (F2) issuing from the light rays (F1). The optical assembly (2) comprises at least a plurality of light guides (4) integral with a correction lens (5). An intermediate optical device (9) is disposed between the optical assembly (2) and the projection optical element (6 '). The intermediate optical device (9) reflects by internal reflection the light rays (F1) which it receives in a first direction (D1) towards the projection optical element (6 ') in a second direction (D2) concurrent with the first direction (D1). The invention also relates to a lighting device comprising a plurality of such optical modules (1). The invention is applicable to a projector having an adaptive lighting function.

Description

OPTICAL MODULE FOR A MOTOR VEHICLE PROJECTOR WITH AN ADAPTIVE LIGHTING FUNCTION, COMPRISING AN OPTICAL LIGHT HARNESS REFLECTIVE SYSTEM PROJECTED.

The field of the present invention is that of projectors for a motor vehicle equipped with at least one optical module generating a light beam. The present invention more particularly relates to an advantageous application of such an optical module to projectors for a motor vehicle, provided with an adaptive lighting function that automatically prevents the glare of the users of the traffic lanes by a motor vehicle .

Motor vehicles are commonly equipped with projectors generating beams of light to illuminate the taxiway and / or to signal the vehicle to other users of the taxiway. Motor vehicle headlights commonly consist of a housing housing one or more optical modules. In general, such an optical module comprises at least one light source and an optical system modifying the characteristics of the light emitted by the light source to finally generate the light beam projected by the projector. The optical system comprises for this purpose one or more optical elements, such as for example a reflector, a transparent body forming a light guide and / or a lens.

Given the evolution of techniques, it has become common to use an opto-electronic light source, such as a LED (Electro-Luminescent Diode), with regard to the benefits provided by such light sources. One or more LEDs are located on a support, such as a card or an electronic film, incorporating a control circuit and an electrical power supply circuit of the LEDs. Depending on the lighting function (s) assigned to the projector, the optical module may comprise several optical sub-modules each comprising at least one LED and an optical system, which makes it possible to treat the light emitted by the different light sources differently, depending on the needs equipping the same optical module.

Projectors fitted to motor vehicles include front projectors operating in two lighting modes. One lighting mode produces optimum lighting commonly referred to as "high beam". Another lighting mode produces a limited lighting commonly referred to as "low beam". In headlamp mode, headlamps illuminate the lane comfortably for the driver by generating light beams of greater range and / or intensity than low beam headlamps. The dipped beam mode illuminates the traffic lane by providing satisfactory visibility for the driver without dazzling other users.

The two lighting modes mentioned above are complementary by being selectively activatable by control means causing switching between one or the other of the lighting modes. Such control means are traditionally implemented manually by the driver of the vehicle maneuvering a manual control member, or even automatically according to the lighting conditions of the driving lane.

In this context, it should be noted that the driver of a vehicle must avoid dazzling other users of the taxiway. For this purpose, if necessary, the driver manually changes the lighting mode to switch the headlamps on his vehicle from the high beam mode to the dipped beam mode. To improve the comfort of the driver, it has been proposed motor vehicle headlamps with an adaptive lighting function, commonly referred to ADB by the acronym Adaptive Driving Beam. Such an adaptive lighting function makes it possible to automatically detect a user of the traffic lanes that can be dazzled by a lighting beam in the high beam mode emitted by the headlamp. From such a detection, the adaptive lighting function modifies the shape of the contour of the illumination beam, with the effect of producing one or more shadow zones preserving the user from glare by the projector kept activated. in high beam mode.

Such an adaptive lighting function has the advantages of being comfortable for the driver, providing optimum illumination of the taxiway without dazzling other users. The driving of vehicles is made more secure.

For example, reference can be made to EP2743567A1 (VALEO VISION), which describes an optical module for a motor vehicle headlamp with an adaptive lighting function. The optical module described by this document comprises a light source, an optical assembly for processing the light emitted by the light source, and a projection lens towards the outside of a light beam. The light source is composed of a plurality of LEDs. The optical assembly includes light guides assigned to each of the LEDs and a correction lens arranged in a dome. The optical assembly thus emits light rays directed towards the projection lens which projects outwardly a light beam from the light rays by providing illumination comprising a plurality of light strips. From a selective activation of the LEDs, the illumination provided by the projector may include areas of shadows to avoid dazzling the users of the taxiway.

However, such an optical module has the disadvantage of being bulky in the direction of projection of the light beam out of the optical module. Such a bulk is in particular induced because of the successive arrangement in the direction of projection of the light beam of the light source, the optical assembly and the projection lens.

Such a congestion is unsatisfactory in the context of the constraints imposed by the motor vehicle manufacturers. Indeed, the headlamps must be structurally organized in such a way as to participate in solving the problems related to the layout constraints imposed on modern motor vehicles.

It therefore seems useful to propose an optical module for a headlamp of a motor vehicle, the structure of which is best organized to limit its size in the direction of projection of the light beam illuminating the traffic lane. Such an organization must be part of the constraints related to the quality and relevance of form of the lighting provided by the projector. Brightness fluctuations and chromatic aberrations of the lighting beams produced by the projector must be avoided. Such difficulties are particularly overcome in the context of a projector with an adaptive lighting function, being equipped with at least one optical module generating lighting comprising a plurality of light bands. The arrangement of the optical module, subject to these constraints of size, however, must not affect the delineation of the shadow areas of the adaptive lighting to be selectively obtained. The quality of the lighting produced by the headlamp must be satisfactory, both in optimal lighting situation and in situation of selective lighting of the vehicle environment by the headlamp.

In this context, the present invention relates to an optical module for a motor vehicle headlamp, and a lighting device comprising at least two such optical modules. The present invention also relates to a projector with an adaptive lighting function.

It is more specifically sought by the present invention to provide an optical module for a motor vehicle headlamp that can be provided with an adaptive lighting function. Such research is part of the problem previously described and aims to provide such an optical module and a lighting device whose size is compatible with the constraints imposed by vehicle manufacturers, without affecting their reliability or performance within the constraints previously stated.

Thus, an optical module according to the present invention successively comprises at least one light source and at least one optical assembly traversed by light rays generated by the light source. The optical module also comprises an optical element projecting outwardly of a light beam from the light rays. Said light source comprises in particular one or more LEDs and / or one or more LASER sources. The optical assembly more particularly comprises at least a plurality of light guides integral with a correction lens.

The successive arrangement of the components composing the optical module as it has just been defined, is therefore identified according to the direction of propagation of the light emitted by the light source towards the projection optical element. The optical module produces light strip lighting. In the specific context of a projector having an adaptive lighting function, a plurality of such optical modules provide illumination comprising a plurality of light bands.

According to the present invention, an intermediate optical device is disposed between the optical assembly and the projection optical element. The intermediate optical device is arranged to receive the light rays in a first direction and to reflect by internal reflection the light rays which it receives towards the projection optical element in a second direction concurrent with the first direction.

The intermediate optical device is for example arranged in a prism capable of directing the light rays that it receives towards the projection optical element. Such a prism has several concurrent faces between them. The prism includes in particular at least one reflecting surface returning in the second direction the light rays admitted in the first direction through an entrance face of the prism. The light rays are projected through an exit face of the prism in the second direction. The second direction corresponds to the direction of projection of the light beam out of the optical module through the projection optical element.

The intermediate optical device may be shaped so that the return of the light rays is made according to the constraints of size of the optical module imposed by the car manufacturer. The intermediate optical device allows to best release the space along the longitudinal axis of the vehicle, defined between the front and the rear of the vehicle. The available space along the elevation axis of the vehicle can thus be exploited to house the optical module. The elevation axis of the vehicle, or vertical axis, corresponds to the vertical axis of extension of the optical module in elevation.

To achieve this objective, the light source and the optical assembly are arranged under the intermediate optical device, along the vertical axis of extension of the optical module. The vertical axis of extension of the optical module is parallel to the first direction. The optical assembly is arranged so as to project the light rays substantially along the axis of elevation of the vehicle, that is to say along the vertical axis of extension of the optical module. The intermediate optical device extends along the vertical axis towards the projection optical element. The light beam is projected out of the optical module in the second direction. The second direction corresponds to a longitudinal axis of extension of the optical module and to a longitudinal axis of the vehicle, extending between the front and the rear of the vehicle. The longitudinal axis is parallel to the second direction.

Thus and to optimize the utility of the optical module, the first direction and the second direction preferably form an angle substantially equal to 90 °.

It should be noted that according to the arrangement of the means for returning the light rays by the intermediate optical device, the general conformation of the intermediate optical device can be adapted according to the constraints related to the available space of reception of the projector and / or its components on the vehicle. In addition, a plurality of light sources and optical assemblies specific to several optical modules may be disposed adjacently in an orientation extending along a lateral axis of general extension of the optical modules.

Said lateral axis corresponds to the lateral axis of general extension of the vehicle, perpendicular to its longitudinal axis and to its vertical axis of elevation relative to the rolling plane of the vehicle. The arrangement in successive adjacency of the optical modules along the lateral axis is possibly to be appreciated with a variation, as for example in a substantially curved orientation as referred to below.

It then arises the difficulty of returning the light rays by the intermediate optical device, by adjusting their concentration towards the optical projection element to limit the distortions and chromatic aberrations of the light beam emitted by the projector. For this purpose, the choice is made to organize the entrance face of the prisms through which the light rays are admitted.

Thus, an input face of the intermediate optical device through which the light rays are admitted is curved in its general plane in at least one direction of inflection. More specifically, the input face of the intermediate optical device is curved in its general plane according to two intersecting inflection directions, and advantageously perpendicular.

The two inflection directions of the input face of the intermediate optical device are in particular the directions defining the general plane of the input face of the intermediate optical device. The general plane of the input face of the intermediate optical device is identified along the longitudinal axis and the lateral extension axis of the optical module. The input face of the intermediate optical device is preferably convex seen from the optical assembly and more specifically seen from the correction lens.

More particularly, the curvature of the input face of the intermediate optical device is defined by a first radius along a first direction of inflection and by a second radius along a second direction of inflection. The first direction of inflection extends in particular along the longitudinal axis of extension of the optical module. The second direction of inflection extends in particular along the lateral axis of extension of the optical module.

The values of the first radius and the second radius are indicative between 20 mm and 80 mm.

According to one embodiment, the value of the first radius and the value of the second radius are identical. According to another embodiment, the value of the first radius and the value of the second radius are different, in order to better concentrate the light rays towards the projection optical element by optimizing the quality of the illumination obtained. The value of the first radius and the value of the second radius are in particular adapted according to the position and / or inclination of the optical assembly with respect to at least one reflecting face of the intermediate optical device returning the light rays to the optical element projection.

More particularly, the intermediate optical device comprises an input face through which the light rays are admitted and an output face through which the light rays emerge. The intermediate optical device further comprises at least one reflecting face adapted to return the light rays from the input face to the output face. The reflecting face is inclined with respect to the input face by an angle indicative of between 30 ° and 60 °.

The exit face of the intermediate optical device is preferably concavely curved, seen from the projection optical element, in the first direction. In other words, the concavity of the output face of the intermediate optical device is at least considered between the opposite edges of the output face of the intermediate optical device along the vertical axis of extension of the optical module.

The intermediate optical device is in particular arranged in a prism having a generally triangular profile in the plane of the optical module defined by its longitudinal axis and its vertical axis of extension. The triangular profile of the prism is defined between the input face, the output face and the reflective face of the intermediate optical device.

The input face and the output face of the intermediate optical device are preferably oriented relative to each other substantially at right angles. In this case, the triangular profile of the prism is more particularly defined by a right triangle, whose hypotenuse identifies the reflecting face and whose two other sides respectively identify the input face and the output face of the intermediate optical device.

According to one embodiment, the intermediate optical device is formed by a one-piece body. The internal reflection of the intermediate optical device is involved in the one-piece body.

According to one embodiment, the correction lens of the optical assembly is at least partly arranged in a dome through which the light rays are projected. The light rays are projected out of the optical assemblies through the domed portion of the optical assemblies. Overall, the correction lens may be arranged in a sphere secured to the light guides.

Such a sphere is advantageously truncated along the lateral axis. As a result, the size of the lighting device along the lateral axis is limited for a given number of optical modules arranged successively adjacent along the lateral axis. The light bands composing the illumination provided by the optical modules are placed closest to each other along the lateral axis.

Thus, the present invention also relates to a lighting device comprising at least two optical modules such as the optical module which has just been described. The illumination provided by the lighting device is thus composed of a plurality of light bands successively adjacent along the lateral axis.

In this context, the respective intermediate optical devices to the optical modules are advantageously integral in forming a unitary unit. The unit unit includes in one body, including transparent, all the intermediate optical devices.

The respective optical projection elements to the optical modules are also advantageously integral, in particular forming a monoblock projection lens.

The optical assemblies respectively to the optical modules are in particular arranged successively adjacent and separated from each other. Channels for individual channeling of the light rays generated respectively by the optical assemblies are preferably arranged between the optical assemblies and the intermediate optical devices. Such corridors are for example defined by masks interposed between two immediately adjacent optical modules. The masks are potentially reported individually on the optical assembly forming a support of the masks. According to one variant, the masks may be mounted on a common support attached to the optical assembly.

The respective optical assemblies to the optical modules may be arranged successively adjacent in a substantially curved orientation generally oriented along the lateral axis of extension of the optical module. More particularly as previously referred to, the successively adjacent arrangement of the optical modules is in this case to be assessed along the lateral axis of extension of the optical module, taking into account a possible curvature of an alignment orientation of the sets. overall optics along the lateral axis of extension of the optical module.

According to one embodiment, the projection lens comprises an input diopter through which are admitted the light rays at the output of the intermediate optical devices. The projection lens also has an output dioptre projecting the light beam from the light rays to the outside of the lighting device. The input diopter and the output diopter are arranged in directions that are concurrent with each other in a plane perpendicular to the first direction and parallel to the second direction. The concurrent orientations of the input diopter and the output diopter give the projection lens a variable thickness along its length extending along the lateral axis of extension of the optical module. As an indication, the thickness of the projection lens varies according to its longitudinal extension between a minimum thickness greater than 1 mm and a maximum thickness less than or equal to 50 mm.

More specifically, the output diopter of the projection lens is generally inclined at an angle between 10 ° and 40 ° with respect to the input diopter, conferring on the projection lens its variation in thickness along its length. In addition, the exit diopter is preferably curved along the length of the projection lens. As an indication, the output diopter is curved in its general plane along the length of the optical lens with a radius of curvature of a value between 140 mm and 160 mm.

The reflecting face of the intermediate optical devices is preferably inclined with respect to the input face of an inclination angle of identical value for each of the intermediate optical devices.

It is not to be excluded from another embodiment, according to which the inclination of the reflecting face with respect to the input face varies potentially from one intermediate optical device to another. Such variation of inclination is achieved according to the changes in shape to obtain lighting produced by the projector.

Thus and according to this embodiment, the reflecting face is inclined with respect to the input face of an angle of distinct values for at least two adjacent prisms, in particular immediately adjacent, or for each of the prisms. By way of example, the extension of the intermediate optical device along the longitudinal axis of extension of each of the optical modules is between 40 mm and 60 mm, for an individual size dimension of the optical modules along the longitudinal axis. between 80 mm and 100 mm. Alternatively and as an indication, the extension of the set of intermediate optical devices along the lateral axis of extension of the lighting device is between 100 mm and 150 mm, for an example number of four sub optical modules. According to the vertical axis of extension of the optical modules, the extension of the intermediate optical device is indicative between 20 mm and 30 mm.

The different dimensional values indicated for the lighting device, concerning each optical module and / or each of the intermediate optical devices are given as an indication. Such values are to be corrected according to the particular case, in particular as a function of the desired extension of the optical module or modules in the second direction, that is to say along the longitudinal axis, and as a function of the angle of return of light rays from the first direction to the projection lens in the second direction.

The present invention also relates to a motor vehicle headlamp equipped with at least one optical module or at least one lighting device as just described. The projector is particularly equipped with an adaptive lighting function and is preferably equipped with a lighting device as just described.

The present invention also relates to a motor vehicle equipped with at least one such projector. It is specified an exemplary embodiment of a lighting device of the present invention mounted on a motor vehicle. The successive arrangement of the light sources and the optical assemblies which are respectively assigned to them, is potentially inclined relative to the rolling plane of the vehicle by an angle of between 1 ° and 5 °.

In this context, it is preferred to incline the orientation of the input faces of the intermediate optical devices, according to the angle of inclination of the successive arrangement of the light sources and the optical assemblies which are respectively assigned to them. Again in this context, the projection lens is potentially inclined relative to the rolling plane of the vehicle according to the inclination angle of the successive arrangement of the light sources and optical assemblies which are respectively assigned to them. Other characteristics, details and advantages of the present invention will emerge more clearly on reading the description given below as an indication, in relation to exemplary embodiments of the invention illustrated in the figures of the attached plates, in which boards: - Figure 1 is a schematic representation in a vertical plane of an optical module according to the present invention. - Figures 2 and 3 are illustrations of a lighting device according to the present invention, respectively shown in exploded perspective and in rear view. FIG. 4 is a perspective illustration of a transparent body incorporating a plurality of participating intermediate optical devices of the lighting device shown in FIG. 2 and FIG. 3. FIG. 5 is a profile illustration of an optical device. participating intermediate of an optical module as shown in FIG. 1. FIG. 6 is a representation of the geometrical configuration of an input face of the intermediate optical device illustrated in FIG.

It should first be noted that the figures show the present invention in detail and in particular ways of its implementation.

Said figures can of course be used, if necessary, to better define the present invention, both in its particularities and in its generality.

Moreover, to clarify and make easy the reading of the description that will be made of the present invention, and to avoid overloading the figures, the common organs shown in the different figures are respectively identified in the descriptions of these figures with the same numbers and / or letters of reference, without implying their individual representation on each of the figures.

In Figure 1, an optical module 1 is arranged to equip a motor vehicle headlight. The optical module 1 receives light L emitted by a light source 3. The light source 3 comprises a plurality of light generating members 3 ', such as each formed of LEDs and / or LASER light sources. According to the direction of light flow through it, the optical module 1 successively comprises an optical assembly 2, an intermediate optical device 9 and an optical projection element 6 'arranged in a lens.

Referring more particularly to Figure 3, the light generating members 3 'assigned to a given optical assembly 2a, 2b, 2c or 2d are for example five in number. The light generating members 3 'are successively arranged in adjacency along a lateral extension axis A2 of a given optical module, corresponding substantially to the lateral axis of the vehicle on which the optical modules are installed. A given optical assembly 2a, 2b, 2c or 2d comprises light guides 4 respectively assigned to each of the light generating members 3 ', hereinafter designated by DEL.

More particularly in FIG. 1 and also visible in FIG. 3, the light L emitted by each of the LEDs 3 'enters light guides 4 which are assigned to them, to be directed towards a correction lens 5. In FIG. the correction lens 5, receiving the light segments reflected internally by the light guides 4, projects light rays F1 generally in a first direction D1. The correction lens 5 is arranged at least partly dome. The correction lens 5 is shaped into a laterally truncated ball, as more particularly visible in FIG. 2 and FIG. 3. The optical assembly 2 thus emits the light rays F1 generally along the first direction D1, oriented along a vertical axis A3d. raising the corresponding optical module 1, when the optical module 1 is installed on the vehicle, to the vertical axis of elevation of the vehicle relative to its rolling plane.

The light guides 4 and the correction lens 5 are advantageously integral, forming a one-piece assembly. Such a one-piece assembly provides an excellent connection of the light guides 4 and the correction lens 5 between them, improving the optical efficiency of the optical assembly 2. There is therefore no diopter of air between one end a light guide 4 and an input face of the correction lens 5.

Still in FIG. 1, the intermediate optical device 9, hereinafter referred to as prism, is formed by a transparent body. The prism 9 is defined by a plurality of faces 10, 11, 12 concurrent at least two by two. The prism 9 concentrates the light rays F1 towards the optical projection element 6 'through which a light beam F2 is projected. The prism 9 is arranged as a reflection member of the light rays F1 towards the projection optical element 6 'in a direction D2 concurrent with the first direction D1. The light beam F2 is thus projected out of the optical module 1 in the direction D2. In the exemplary embodiment illustrated, the first direction D1 and the second direction D2 are concurrent at an angle of 90 °. Such arrangements make it possible to limit the bulk of the optical module 1 along the second direction D2, oriented essentially along the longitudinal axis A1 of extension of the optical module 1. The longitudinal axis A1 of extension of the optical module 1 corresponds to the longitudinal axis of extension of the vehicle between the front and the rear when the optical module 1 is installed on the vehicle.

More particularly in Figure 5, an embodiment of the prism 9 is shown in profile along a plane defined by the longitudinal axis A1 and the vertical axis A3. The prism 9 has an input face 10 through which the light rays F1 are admitted. The prism 9 also has an exit face 11 through which the light beam F2 is projected towards the projection optical element 6 '. The exit face 11 of the prism 9 is concavely curved along the vertical axis A3 seen from the projection optical element 6 '. A reflecting face 12 of the prism 9 is inclined with respect to the entry face 10 and the exit face 11 of the prism 9.

The profile of the prism 9 has in its plane defined by the longitudinal axis A1 and the vertical axis A3, a generally triangular conformation. The sides of the triangle defining the profile of the prism 9 are respectively defined by the entry face 10, the exit face 11 and the reflecting face 12. More particularly, the entry face 10 and the exit face 11 of the prism 9 are oriented relative to each other substantially at right angles in their general plane. The reflecting face 12 is inclined with respect to the general orientation of the input face 10 of the prism 9 of an inclination angle B of a value between 30 ° and 60 °, such as in the order of 45 ° on the exemplary embodiment illustrated. The light rays F1 emitted by the optical assembly 2 penetrate inside the prism 9 through its input face 10 in the first direction D1, and are reflected by the reflecting face 12 towards the exit face 11 of the prism 9 following the second direction D2.

It is then necessary to obtain a relevant and reliable projection of the light rays F1 towards the projection optical element 6 '. It must also be obtained at the output of the optical module 1 a quality light beam F2, avoiding in particular fluctuations in light intensity and chromatic aberrations of the light beam F2. For this purpose and with reference to FIG. 6, it is proposed to arrange, in a particular geometrical configuration, the input face 10 of the intermediate optical device 9 through which the light rays F1 are admitted.

It can be seen in FIG. 6 that the input face 10 of the intermediate optical device 9 is curved in two directions of extension defining its general plane and respectively corresponding to the longitudinal axis A1 and to the lateral extension axis A2 of the optical module 1. More particularly, the input face 10 of the intermediate optical device 9 is curved along a first radius R1 along the longitudinal axis A1 and along a second radius R2 along the lateral axis A2. Viewed from the optical assembly 2, and more particularly from the correction lens 5, the curved configuration of the input face 10 gives it a double-inflection convexity according to the dimensions A1, A2 defining its general plane.

The values of the first radius R1 and the second radius R2 are between twenty millimeters (20 mm) and eighty millimeters (80 mm). The respective values of the first radius R1 and the second radius R2 are identical or different values. Thus, a variation of the value of the first radius R1 and / or the second radius R2 may be necessary to adapt the configuration of the intermediate optical device 9 according to the inclination, the curvature and / or the variation in thickness of the optical element 6 'projection.

In FIGS. 2 and 3, a lighting device is arranged to equip a motor vehicle headlamp. The lighting device can be mounted in a specific housing for mounting on the vehicle and / or inside a projector enclosure. Such a housing is not shown to avoid overloading the figures. The lighting device comprises a plurality of optical modules, such as the optical module 1 shown in FIG. 1. In the exemplary embodiment illustrated, the optical modules are four in number.

The optical modules each comprise an optical assembly 2a, 2b, 2c or 2d and an intermediate optical device 9a, 9b, 9c or 9d. The optical projection elements respectively assigned to the various optical modules are incorporated in the same one-piece assembly formed of a projection lens 6. As previously referred to, the optical assemblies 2a, 2b, 2c, 2d are each generators of light beams F1 globally oriented in the first direction D1. The light rays F1 are returned by the intermediate optical devices 9a, 9b, 9c or 9d to the projection lens 6 in the second direction D2.

According to an exemplary embodiment, the different prisms 9a, 9b, 9c, 9d are each individually formed by a transparent body. To facilitate the realization and the geometrical referencing of the prisms 9a, 9b, 9c, 9d between them, as well as their mounting inside the lighting device, it is preferred to incorporate the prisms 9a, 9b, 9c, 9d into the same transparent body 13, thus forming a unitary unitary assembly as shown in FIG. 4.

The optical assemblies 2a, 2b, 2c, 2d are arranged successively in adjacent side by side in an orientation D corresponding generally to the lateral axis A2 of extension of the optical modules and consequently to the lateral axis A2 of general extension of the lighting device. The successive arrangement of the optical assemblies is more particularly curved along the lateral axis A2 in the example embodiment illustrated. The optical assemblies 2a, 2b, 2c, 2d are advantageously grouped together in a single unitary assembly. Such unitary assembly can be easily installed in an enclosure 16, partially illustrated in Figure 2 to avoid overloading the figures. From the light rays F1 emitted by the optical assemblies 2a, 2b, 2c, 2d, the lighting device produces at the front of the vehicle illumination comprising a plurality of light strips. The lighting provided by the lighting device is formed of vertical light segments partially overlapping. Such lighting can advantageously be exploited for a projector including an adaptive lighting function.

More particularly, the outline of the illumination provided by the lighting device can be adapted from a selective activation of the respective LEDs 3 to each of the optical assemblies 2a, 2b, 2c, 2d. It is thus possible to create a dark window in the lighting beam of the headlamp adapted to follow the lateral displacement of a vehicle followed or crossed. Such provisions make it possible to avoid dazzling in the high beam mode the users of the taxiway.

In Figure 3, corridors 7 are delimited by masks 8 interposed at least partly between the optical modules 2a, 2b, 2c, 2d. Such masks 8 are absent from Figure 2 to facilitate reading. The corridors 7 make it possible to channel the light rays F1 individually from the optical assemblies 2a, 2b, 2c, 2d towards the intermediate optical devices 9a, 9b, 9c, 9d assigned to them respectively. Such arrangements make it possible to avoid parasitic radiation of an optical assembly 2a, 2b, 2c, 2d with respect to another immediately adjacent optical assembly 2a, 2b, 2c, 2d.

The masks 8 are for example mounted on the optical assemblies 2a, 2b, 2c, 2d, either independently or via a common support. The masks 8 can also be mounted on the lighting device via a specific support on which are grouped all the masks 8. The masks 8 can then be mounted on such a speaker 16.

In FIG. 2, the projection lens 6 comprises an input diopter 14 and an output diopter 15. The input diopter 14 receives, together, the light rays F1 reflected by the reflecting face 12 of the set of prisms 9a, 9b, 9c, 9d. The input diopter 14 has a planar or alternately concave profile seen from the exit face 11 of the prisms 9a, 9b, 9c, 9d. The F1 light rays admitted into the projection lens 6 escape from the optical module through the output diopter 15 in the second direction D2. The output diopter 15 has a convex profile, seen from prisms 9a, 9b, 9c, 9d, focusing the light beam F2 generated by the lighting device to a transparent wall of the projector through which the light produced by the light emitting device emerges. 'lighting. The output diopter 15 may optionally comprise patterns on its surface, such as modulations or microstructures for example, to provide a controlled blur at the cuts made by the light strips.

The input diopter 14 and the output diopter 15 are oriented in directions that are concurrent with each other, in a plane defined by the longitudinal axis A1 and the lateral axis A2. Such provisions give the projection lens 6 a variable thickness E1, E2 along the lateral axis A2 extension of the lighting device. In addition, the exit diopter 15 is preferably curved in its general plane between its thickest end E1 and its thinnest end E2. Such a curvature of the output diopter 15 is defined by a radius of curvature R3 of the order of 150 mm, as an indication.

In FIG. 3, reference is made to a plane P parallel to the rolling plane of the vehicle equipped with a headlamp comprising the lighting device. In the exemplary embodiment illustrated, the orientation D of the arrangement in succession adjacent optical assemblies 2a, 2b, 2c, 2d is inclined relative to the rolling plane of the vehicle, an angle G of the order of 3 °. As a result, the input faces 10 of the prisms 9a, 9b, 9c, 9d are likewise inclined along said angle G. It follows that the optical assemblies 2a, 2b, 2c, 2d are successively arranged in a curved orientation at the along the lateral axis A2 and along the vertical axis A3 of extension of the lighting device.

Claims (21)

An optical module (1) for a motor vehicle headlamp comprising successively at least one light source (3), at least one optical assembly (2) traversed by light rays (F1) generated by the light source (3), an element optical projection (6 ') to the outside of a light beam (F2) from the light rays (F1), the optical assembly (2) comprising at least a plurality of light guides (4) integral with a correction lens (5), characterized in that an intermediate optical device (9) is arranged between the optical assembly (2) and the projection optical element (6 ') while being arranged to receive the light rays (F1 ) in a first direction (D1) and for reflecting by internal reflection the light rays (F1) towards the projection optical element (6 ') in a second direction (D2) concurrent with the first direction (D1), the optical device intermediate (9) comprising a face d input (10) through which are admitted the light rays (F1), an exit face (11) through which the light rays (F1) emerge, and at least one reflecting surface (12) able to return the light rays ( F1) from the input face (10) to the output face (11). 2. Optical module (1) according to claim 1, characterized in that the first direction (D1) and the second direction (D2) form an angle substantially equal to 90 °. 3. Optical module (1) according to any one of claims 1 and 2, characterized in that an entrance face (10) of the intermediate optical device (9) through which are admitted the light rays (F1) is curved in its general plane according to at least one inflection direction (A1, A2). 4. Optical module (1) according to claim 3, characterized in that the input face (10) of the intermediate optical device (9) is curved in its general plane in two inflection directions (A1, A2) concurrent. 5. Optical module (1) according to any one of claims 3 and 4, characterized in that the input face (10) of the intermediate optical device (9) is convex, seen from the optical assembly (2). 6. Optical module (1) according to claims 4 and 5, characterized in that the curvature of the input face (10) of the intermediate optical device (9) being defined by a first radius (R1) in a first direction d Inflection (A1) and a second radius (R2) in a second inflection direction (A2), the values of the first radius (R1) and the second radius (R2) are between 20 mm and 80 mm. 7. Optical module (1) according to any one of the preceding claims, characterized in that the reflecting face (12) is inclined relative to the input face (10) of an angle (B) of a value between 30 ° and 60 °. 8. Optical module (1) according to any one of the preceding claims, characterized in that the output face (11) of the intermediate optical device (9) is concavely curved seen from the optical projection element (6 '). ), following the first direction (D1). 9. Optical module (1) according to any one of claims 1 to 8, characterized in that the intermediate optical device (9) is formed by a one-piece body, the internal reflection of the intermediate optical device (9) involved in the body piece. 10. Optical module (1) according to any one of claims 1 to 9, characterized in that the correction lens (5) of the optical assembly (2) is at least partly arranged in a dome. 11. Lighting device comprising at least two optical modules (1) according to any one of claims 1 to 10. 12. Lighting device according to claim 11, characterized in that the intermediate optical devices (9a, 9b, 9c, 9d) respectively to the optical modules (1) are integral forming a unitary unit. 13. Lighting device according to any one of claims 11 and 12, characterized in that the projection optical elements (6 ') respectively optical modules (1) are integral in forming a projection lens (6) monobloc. 14. Lighting device according to any one of claims 11 to 13, characterized in that the optical assemblies (2a, 2b, 2c, 2d) respectively to the optical modules (1) are arranged adjacent and separated from each other. 15. Lighting device according to claim 14, characterized in that corridors (7) for individual channeling of the light rays (F1) are arranged between the optical assemblies (2a, 2b, 2c, 2d) and the intermediate optical devices ( 9a, 9b, 9c, 9d). 16. Lighting device according to claim 15, characterized in that the corridors (7) are delimited by masks (8) interposed between two optical modules (1) immediately adjacent. Lighting device according to one of Claims 12 to 16, characterized in that the optical assemblies (2a, 2b, 2c, 2d) respectively to the optical modules (1) are arranged adjacent in an orientation (D) substantially curve. 18. Lighting device according to any one of claims 13 to 17, characterized in that the projection lens (6) comprises an input diopter (14) through which are admitted the light rays (F1) emerging from intermediate optical devices (9a, 9b, 9c, 9d) and an exit diopter (15) projecting the light beam (F2), the input diopter (14) and the output dioptre outwardly of the lighting device (15) being arranged in concurrent orientations with respect to each other in a plane perpendicular to the first direction (D1) and parallel to the second direction (D2), conferring a thickness (E1, E2) variable to the projection lens (6). 19. Lighting device according to claim 18, characterized in that the output diopter (15) of the projection lens (6) is generally inclined at an angle (C) between 10 ° and 40 ° relative to the input diopter (14) conferring on the projection lens (6) its thickness variation (E1, E2). 20. Lighting device according to any one of claims 18 and 19, characterized in that the thickness (E1, E2) of the projection lens (6) varies between a minimum thickness (E2) greater than 1 mm and a maximum thickness (E1) less than or equal to 50 mm. Motor vehicle headlamp with an adaptive lighting function and equipped with at least one optical module (1) according to any one of claims 1 to 10 or at least one lighting device according to any one of the preceding claims. claims 11 to 20.