FR3056691A1 - 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

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,056,691 (to be used only for reproduction orders)

©) National registration number: 16 59369

COURBEVOIE

©) Int Cl ⁸ : F21 V13 / 00 (2017.01), F21 V 7/00, F21 S 41/30

A1 PATENT APPLICATION

©) Date of filing: 09.29.16. ©) Applicant (s): VALEO VISION Joint-stock company (30) Priority: simplified - FR. ©) Inventor (s): GROMFELD YVES. ©) Date of public availability of the request: 30.03.18 Bulletin 18/13. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents Holder (s): VALEO VISION Joint stock company related: folded. ©) Extension request (s): ©) Agent (s): VALEO VISION Limited company.

OPTICAL MODULE FOR A MOTOR VEHICLE PROJECTOR HAVING AN ADAPTIVE LIGHTING FUNCTION, COMPRISING AN OPTICAL SYSTEM FOR RETURNING THE PROJECTED LIGHT BEAM.

FR 3 056 691 - A1 küjV The invention relates to an optical module (1) for a motor vehicle headlight. 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 for projection (6 d towards the outside of a light beam (F2) coming 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 arranged between the optical assembly (2) and the projection optical element (6 j. The intermediate optical device (9) reflects by internal reflection the light rays (F1) that 'it receives in a first direction (D1) towards the optical projection element (6j in a second direction (D2) concurrent with the first direction (D 1). The invention also relates to a lighting device comprising a plurality of such optical modules (1). The invention is applicable to a projector provided with a function adaptive lighting.

OPTICAL MODULE FOR A MOTOR VEHICLE PROJECTOR HAVING AN ADAPTIVE LIGHTING FUNCTION, INCLUDING AN OPTICAL SYSTEM FOR RETURNING THE PROJECTED LIGHT BEAM.

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

Motor vehicles are commonly equipped with projectors generating light beams 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 in order to finally generate the lighting beam projected by the projector. The optical system for this purpose comprises one or more optical members, 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 exploit an opto-electronic type light source, such as an LED (Light Emitting Diode), in view of the advantages provided by such light sources. One or more LEDs are installed on a support, such as a card or an electronic film, integrating a control circuit and a circuit for supplying electrical power to the LEDs. Depending on the lighting function (s) assigned to the projector, the optical module may include 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, as required. equipping the same optical module.

The headlights fitted to motor vehicles include front headlights operating in two lighting modes. One lighting mode produces optimal lighting commonly known as "main beam" Another lighting mode produces limited lighting commonly known as "low beam". In high beam mode, the headlamps illuminate the taxiway comfortably for the driver by generating beams of light of greater range and / or intensity than in low beam. The dipped beam mode allows the lane to be lit 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 depending on the lighting conditions of the taxiway.

In this context, it should be noted that the driver of a vehicle must avoid

0 to dazzle other users of the taxiway. To this end, if necessary, the driver manually changes the lighting mode to switch the headlights fitted to his vehicle from the main beam mode to the low beam mode. To improve driver comfort, headlights for motor vehicles have been proposed with an adaptive lighting function,

5 commonly referred to as ADB by the acronym Adaptive Driving

Beam. Such an adaptive lighting function makes it possible to automatically detect a user of traffic lanes which can be dazzled by a beam of lighting in high beam mode emitted by the headlamp. Based on such detection, the adaptive lighting function changes the shape of the contour of the

0 light beam, with the effect of producing one or more shaded areas preserving the user from being dazzled by the headlamp kept activated in high beam mode.

Such an adaptive lighting function has the advantages of being comfortable for the driver, of providing optimal lighting of the taxiway without dazzling other users. Driving vehicles is made safer.

Reference may for example be made to document 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 lens for projecting outwards 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 dome-shaped correction lens. The optical assembly thus emits light rays directed towards the projection lens which projects outwards a light beam coming from the light rays by providing lighting comprising a plurality of light bands. From a selective activation of the LEDs, the lighting provided by the projector can include shaded areas to avoid dazzling traffic lane users.

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 bulk is in particular induced by the successive arrangement in the direction of projection of the light beam from the light source, of

5 the optical assembly and the projection lens.

Such a size is unsatisfactory in the context of the constraints imposed by the manufacturers of motor vehicles. Indeed, projectors must be structurally organized so as to participate in the resolution of

0 problems related to layout constraints imposed on modern motor vehicles.

It therefore appears useful to propose an optical module for a headlamp of a motor vehicle, the structure of which is best organized to limit its size according to 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 the shape of the lighting provided by the projector. Light intensity fluctuations and chromatic aberrations in the light beams produced by the projector must be avoided. Such difficulties are in particular to be overcome in the context of a projector provided with an adaptive lighting function, by being equipped with at least one optical module îo generating lighting comprising a plurality of light bands.

The arrangement of the optical module, subject to these space constraints, must not however affect the delimitation 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 partial selective lighting of the vehicle environment by the headlamp.

In this context, the present invention relates to an optical module for

0 a motor vehicle headlamp, as well as 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 a

5 optical module for a motor vehicle headlamp which can be fitted with an adaptive lighting function. Such research is part of the above problem and aims to propose such an optical module and a lighting device whose size is compatible with the constraints imposed by vehicle manufacturers, and this without affecting their reliability or

0 performance within the framework of the previously stated constraints.

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 includes an optical element for projecting outwards a light beam from the light rays. Said light source notably consists of 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 of 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 optical projection element. The optical module produces light strip lighting. In the specific context of a projector with an adaptive lighting function, a plurality of such optical modules provide lighting comprising a plurality of light strips. 15

According to the present invention, an intermediate optical device is disposed between the optical assembly and the optical projection 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

0 the optical projection element in a second direction concurrent with the first direction.

The intermediate optical device is for example arranged in the form of a prism capable of directing the light rays which it receives towards the optical projection element. Such

5 prism has several concurrent faces between them. The prism in particular comprises at least one reflecting face returning in the second direction the light rays admitted in the first direction through an entry face of the prism. The light rays are projected through an exit face of the prism in the second direction. The second direction corresponds

0 to the direction of projection of the light beam out of the optical module through the projection optical element.

The intermediate optical device can be shaped so that the light rays are returned according to the size constraints of the optical module imposed by the car manufacturer. The intermediate optical device makes it possible to free up the space along the longitudinal axis of the vehicle, defined between the front and the rear of the vehicle. The space available along the elevation axis of the vehicle can thus be used 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.

îo 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 elevation axis 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 optical projection 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

0 vehicle. The longitudinal axis is parallel to the second direction.

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

5 It should be noted that according to the arrangement of the methods of returning the light rays by the intermediate optical device, the general conformation of the intermediate optical device can be adapted according to the constraints linked to the available space for receiving the projector and / or its components on the vehicle. In addition, a plurality of light sources and optical assemblies

0 specific to several optical modules, can be arranged adjacent 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 successive adjacent arrangement of the optical modules along the lateral axis is possibly to be appreciated, except for a variation, such as for example in a substantially curved orientation as referred to below.

The difficulty then arises of the return of the light rays by the intermediate optical device, by adapting their concentration to the optical projection element to limit distortions and chromatic aberrations of the light beam emitted by the projector. To this end, the choice is made to organize the entry face of the prisms through which the light rays are admitted.

Thus, an entry 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 entry face of the intermediate optical device is curved in its general plane in two directions of concurrent inflection, and advantageously perpendicular.

The two directions of inflection of the entry face of the intermediate optical device are in particular the directions defining the general plane of the entry face of the intermediate optical device. The general plane of the entry face of the intermediate optical device is identified along the longitudinal axis and the lateral axis

5 extension 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 optical device

0 intermediate is defined by a first radius in a first direction of inflection and by a second radius in 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 of the second radius are for information 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 ray and the value of the second ray are different, in order to better concentrate the light rays towards the optical projection element by optimizing the quality of the lighting obtained. The value of the first ray and the value of the second ray are in particular adapted according to the position and / or the inclination of the optical assembly relative to at least one reflecting face of the intermediate optical device returning the light rays towards the optical element. projection.

More particularly, the intermediate optical device comprises an entry face through which the light rays are admitted and an exit face through which the light rays exit. The intermediate optical device

0 further comprises at least one reflecting face capable of returning the light rays from the entry face to the exit face. The reflecting face is inclined relative to the entry face by an angle of an indicative value between 30 ° and 60 °.

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

0 extension of the optical module.

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

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

0 through the domed part of the optical assemblies. Overall, the correction lens can be arranged in a sphere integral with 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

5 a given number of optical modules arranged successively adjacent along the lateral axis. The light strips composing the lighting provided by the optical modules are placed as close as possible to each other along the lateral axis.

0 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 lighting provided by the lighting device is thus composed of a plurality of light strips successively adjacent along the lateral axis.

In this context, the respective intermediate optical devices to the optical modules are advantageously integral by forming a monobloc unit. The monobloc unit combines all of the intermediate optical devices in a single body, notably transparent.

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

The respective optical assemblies to the optical modules are in particular arranged successively adjacent and separated from each other. Corridors for individually channeling the light rays generated respectively by the optical assemblies are preferably provided between the optical assemblies and the intermediate optical devices. Such corridors are for example delimited by masks interposed between two immediately adjacent optical modules. The masks are potentially attached individually to the optical assembly forming a support for the masks. According to a variant, the

0 masks can be mounted on a common support attached to the optical assembly.

The optical assemblies respective to the optical modules can be successively adjacent in a substantially curved orientation

5 generally oriented along the lateral axis of extension of the optical module. More particularly as previously mentioned, the arrangement successively adjacent 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 assemblies optics generally along the lateral axis

0 extension of the optical module.

According to one embodiment, the projection lens comprises an input diopter through which the light rays are admitted at the output of the intermediate optical devices. The projection lens also includes an output diopter projecting the light beam from the light rays towards the outside of the lighting device. The input diopter and the output diopter are arranged in concurrent orientations with respect to 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 of between 10 ° and 40 ° relative to the input diopter, giving the projection lens its thickness variation along its length. In addition, the output 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

0 curvature with a value between 140 mm and 160 mm.

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

It is not to exclude another embodiment, according to which the inclination of the reflecting face with respect to the entry face potentially varies from one intermediate optical device to another. Such a variation in inclination is carried out as a function of the shape modifications to be obtained from

0 the lighting produced by the projector.

Thus, according to this embodiment, the reflecting face is inclined relative to the entry face by an angle of distinct values for at least two adjacent prisms, in particular immediately adjacent, or even for each of the prisms.

For 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 a dimension of individual size of the optical modules along the longitudinal axis between 80 mm and 100 mm. Alternatively and by way of indication, the extension of all of the 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 optical sub-modules. According to the vertical axis of extension of the optical modules, the extension of the intermediate optical device is for information between 20 mm and 30 mm.

The different dimensional values indicated for the lighting device, for each optical module and / or each of the intermediate optical devices are given for information. Such values are to be corrected according to the case in point, in particular according to the desired extension of the

0 or optical modules in the second direction, that is to say along the longitudinal axis, and as a function of the angle of return of the light rays from the first direction towards the projection lens in the second direction.

The present invention also relates to a headlight for a motor vehicle 25 equipped with at least one optical module or at least one lighting device as they have just been described. The projector is notably endowed with an adaptive lighting function and is preferably equipped with a lighting device as it has just been described.

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

In this context, it is preferred to tilt 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 of the optical assemblies which are respectively assigned to them. Still in this context, the projection lens is potentially inclined relative to the running plane of the vehicle according to the angle of inclination of the successive arrangement of the light sources and of the 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 by way of indication, in relation to exemplary embodiments of the invention illustrated in the figures of the appended plates, in which boards :

- Figure 1 is a schematic representation in a vertical plane of an optical module according to the present invention.

0 - Figures 2 and 3 are illustrations of a lighting device according to the present invention, respectively shown in exploded perspective and in rear view.

- Figure 4 is a perspective illustration of a transparent body incorporating a plurality of participating intermediate optical devices of the

5 lighting device shown in FIG. 2 and FIG. 3.

- Figure 5 is a profile illustration of an intermediate optical device participating in an optical module as shown in Figure 1.

- Figure 6 is a representation of the geometric configuration of an input face of the intermediate optical device illustrated in Figure 5.

It should first of all be noted that the figures show the present invention in detail and according to specific methods 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.

Furthermore, to clarify and make it easier to read the description which will be given of the present invention, as well as to avoid overloading the figures, the common members represented in the different figures are respectively identified in the descriptions specific to these figures with the same reference numbers and / or letters, without implying their individual representation in each of the figures.

In FIG. 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 by LEDs and / or LASER light sources. Depending on 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 as a lens.

Referring more particularly to FIG. 3, the generating members

0 of light 3 ’assigned to a given optical assembly 2a, 2b, 2c or 2d, are for example five. The light generating members 3 ’are successively arranged in adjacent fashion along a lateral axis A2 for the extension 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

5 or 2d comprises light guides 4 respectively assigned to each of the light generating members 3 ’, hereinafter designated by LED.

More particularly in FIG. 1 and also visible in FIG. 3, the light L emitted by each of the LEDs 3 'penetrates into light guides 4

0 which are assigned to them, to be directed towards a correction lens 5. In FIG. 1, 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 in a dome. The correction lens 5 is shaped into a laterally truncated ball, as more particularly visible in FIGS. 2 and FIG. 3. The optical assembly 2 thus emits the light rays F1 generally in the first direction D1, oriented along a vertical axis A3 d elevation of the optical module 1 corresponding, when the optical module 1 is installed on the vehicle, to the vertical axis of elevation of the vehicle relative to its running plane.

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

Still in FIG. 1, the intermediate optical device 9, otherwise referred to below as a 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 ’

0 through which a light beam F2 is projected. The prism 9 is arranged as a member for returning the light rays F1 to the optical projection 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 illustrated embodiment, the first direction D1 and the second direction

5 D2 are concurrent at an angle of 90 °. Such arrangements make it possible to limit the size of the optical module 1 in 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

0 optical module 1 is installed on the vehicle.

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

îo The profile of the prism 9 has in its plane defined by the longitudinal axis A1 and by 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 inlet face 10, the outlet face 11 and the reflective face 12. More particularly, the inlet face 10 and to the outlet face 11 of the prism 9 are oriented relative to each other at substantially right angles in their general plane. The reflecting face 12 is inclined relative to the general orientation of the entry face 10 of the prism 9 by an angle of inclination B of a value between 30 ° and 60 °, such as of the order of 45 ° on the illustrated embodiment. The light rays F1 emitted by the optical assembly 2 penetrate inside the prism 9 to

0 through its entry face 10 in the first direction D1, and are returned by the reflecting face 12 to the exit face 11 of the prism 9 in the second direction D2.

It is then necessary to obtain a relevant and reliable projection of the rays

5 bright F1 to the 6 ’projection optical element. A quality light beam F2 must also be obtained at the output of the optical module 1, in particular by avoiding light intensity fluctuations and chromatic aberrations of the light beam F2. To this end and with reference to FIG. 6, it is proposed to arrange, according to a particular geometric 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 entry face 10 of the intermediate optical device 9 is curved in two directions of extension defining its general plane and corresponding respectively to the longitudinal axis A1 and to the lateral axis A2 of extension 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. Seen 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 along 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 in the value of the first radius R1 and / or of 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. projection 6 '.

In FIGS. 2 and FIG. 3, a lighting device is arranged to equip

0 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 case 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 example of

5 illustrated embodiment, 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 projection optical elements respectively assigned to the different optical modules

0 are incorporated into the same monobloc assembly formed by a projection lens 6. As previously mentioned, the optical assemblies 2a, 2b, 2c, 2d are each generators of light rays F1 generally 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 formed individually by a transparent body. To facilitate the realization and the geometric referencing of the prisms 9a, 9b, 9c, 9d therebetween, as well as their mounting inside the lighting device, it is preferred to incorporate the prisms 9a, 9b, 9c, 9d in the same transparent body 13, thus forming a unitary and monobloc assembly as illustrated in FIG. 4.

The optical assemblies 2a, 2b, 2c, 2d are successively disposed side by side in an orientation D corresponding overall 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 exemplary embodiment illustrated. The optical assemblies 2a, 2b, 2c, 2d are advantageously grouped in the same unitary assembly. Such a unitary assembly can easily be installed in an enclosure 16, partially illustrated

0 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 lighting at the front of the vehicle comprising a plurality of light strips. The lighting provided by the lighting device

5 is formed by vertical light segments partially overlapping. Such lighting can advantageously be used for a projector in particular provided with an adaptive lighting function.

More specifically, the outline of the lighting provided by the device

0 lighting 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 illumination beam of the projector capable of following the lateral movement of a vehicle being followed or crossed. Such provisions make it possible to avoid dazzling users of the taxiway in high beam mode.

In FIG. 3, corridors 7 are delimited by masks 8 interposed 5 at least partly between the optical modules 2a, 2b, 2c, 2d. Such masks 8 are absent from FIG. 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 to the intermediate optical devices 9a, 9b, 9c, 9d which are respectively assigned to them. Such arrangements make it possible to avoid parasitic radiation from 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 by means of a common support. The masks 8 can also be mounted on the lighting device by means of a specific support on which all the masks 8 are grouped together. The masks 8 can then be mounted on such an enclosure

16.

0 In FIG. 2, the projection lens 6 comprises an input diopter 14 and an output diopter 15. The input diopter 14 jointly receives the light rays F1 returned 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 light rays F1 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 the prisms 9a, 9b, 9c, 9d, focusing the light beam F2 generated by the lighting device towards a transparent wall of the projector through which the light produced by

0 the lighting device. The output diopter 15 may optionally include patterns on its surface, such as of the modulation or microstructure type for example, to provide controlled blurring at the level of the cuts made by the light bands.

The input diopter 14 and the output diopter 15 are oriented in concurrent directions relative to each other, in a plane defined by the longitudinal axis A1 and the lateral axis A2. Such arrangements give the projection lens 6 a variable thickness E1, E2 along the lateral axis A2 of extension of the lighting device. In addition, the output 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, for information.

In FIG. 3, reference is made to a plane P parallel to the running plane of the vehicle provided with a headlight comprising the lighting device. In the illustrated embodiment, the orientation D of the arrangement in adjacent succession of the optical assemblies 2a, 2b, 2c, 2d is inclined relative to the running plane of the vehicle, by 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 at said angle G. It appears therefrom that the optical assemblies 2a, 2b, 2c, 2d are successively arranged in a curved orientation at the times along the lateral axis A2 and along the vertical axis A3

0 extension of the lighting device.

Claims (22)

1. Optical module (1) for a motor vehicle headlamp successively comprising 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 ') outward 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 disposed between the optical assembly (2) and the optical projection element (6 ') 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). 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 input face (10) of the intermediate optical device (9) through which the light rays (F1) are admitted is curved in its general plane in at least one direction of inflection (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 directions of inflection (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 by a second radius (R2) in a second direction of inflection (A2), the values of the first radius (R1) and of the second radius (R2) are between 20 mm and 80 mm. 7. Optical module (1) according to any one of claims 1 to 6, characterized in that the intermediate optical device (9) comprises an entry face (10) through which the light rays (F1) are admitted, an exit face (11) through which the light rays (F1) exit, and at least one reflecting face (12) capable of returning the light rays (F1) from the entry face (10) to the exit face (11). 8. Optical module (1) according to claim 7, characterized in that the reflecting face (12) is inclined relative to the input face (10) by an angle (B) of a value between 30 ° and 60 °. 9. Optical module (1) according to any one of claims 7 and 8, characterized in that the outlet face (11) of the intermediate optical device (9) is curved concave seen from the optical projection element ( 6 '), following the first direction (D1). 10. Optical module (1) according to any one of claims 1 to 9, characterized in that the intermediate optical device (9) is formed by a monobloc body, the internal reflection of the intermediate optical device (9) intervening in the body monobloc. 11. Optical module (1) according to any one of claims 1 to 10, characterized in that the correction lens (5) of the optical assembly (2) is at least partially arranged in a dome. 12. Lighting device comprising at least two optical modules (1) according to any one of claims 1 to 11. 13. Lighting device according to claim 12, characterized in that the 5 intermediate optical devices (9a, 9b, 9c, 9d) respective to the optical modules (1) are integral by forming a monobloc unit. 14. Lighting device according to any one of claims 12 and 13, characterized in that the optical projection elements (6 ') respective to the optical modules (1) are integral by forming a projection lens (6) in one piece . 15. Lighting device according to any one of claims 12 to 14, characterized in that the optical assemblies (2a, 2b, 2c, 2d) respective to 15 optical modules (1) are arranged adjacent to and separated from each other. 16. Lighting device according to claim 15, characterized in that corridors (7) for individual channeling of the light rays (F1) are formed between the optical assemblies (2a, 2b, 2c, 2d) and the optical devices 2 0 intermediates (9a, 9b, 9c, 9d). 17. Lighting device according to claim 16, characterized in that the corridors (7) are delimited by masks (8) interposed between two immediately adjacent optical modules (1). 18. Lighting device according to any one of claims 13 to 17, characterized in that the optical assemblies (2a, 2b, 2c, 2d) respective to the optical modules (1) are disposed adjacent in an orientation (D) substantially curve. 19. Lighting device according to any one of claims 14 to 18, characterized in that the projection lens (6) comprises an input diopter (14) through which the light rays (F1) exiting the intermediate optical devices (9a, 9b, 9c, 9d) and an output diopter (15) projecting towards the outside of the lighting device the light beam (F2), the input diopter (14) and the output diopter (15) being arranged in directions 5 concurrent with each other in a plane perpendicular to the first direction (D1) and parallel to the second direction (D2), giving a variable thickness (E1, E2) to the projection lens (6) . 20. Lighting device according to claim 19, characterized in that the output diopter (15) of the projection lens (6) is generally inclined by an angle (C) between 10 ° and 40 ° relative to to the input diopter (14) by conferring on the projection lens (6) its variation in thickness (E1, E2). 21. Lighting device according to any one of claims 19 and 20, 15 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. 22. Motor vehicle headlamp with lighting function Adaptive and equipped with at least one optical module (1) according to any one of claims 1 to 11 or at least one lighting device according to any one of claims 12 to 21. 1/2 2a ' 2/2 < Ό CM