Lighting module

Abstract

The invention relates to a lighting module for a motor vehicle, the lighting module comprising at least two stacked lighting sub-modules (1), each comprising a source (4), a reflector (3), a mirror (5) and a projection device (6), the mirror (5) reflecting the light reflected by the reflector (3) towards the projection device (6), thereby forming a virtual image (7) of the reflector (3), wherein the projection device (6), the mirror (5) and the reflector (3) are positioned relative to one another such that the object focal point (6a) of the projection device (6) is positioned close to the virtual image (7) of the reflective surface of the reflector (3), and wherein the module further comprises a support (11) that extends along a support plane (8) and on which all of the light sources (4) of the sub-modules (1) are positioned. This plane (8), like the mirrors (5), has a predetermined orientation.

Description

Light module

[0001] The present invention relates to the field of lighting, which includes signaling, and that of the components, particularly optical components, which participate therein. It finds particularly advantageous application in the field of motor vehicles. In particular, it relates to a lighting module for a motor vehicle. STATE OF THE ART

[0002] In the automotive sector, we know of modules capable of emitting light beams enabling lighting and / or signaling functions to be performed.

[0003] These modules must provide sufficient safety and comfort for road users, by emitting light specifically in certain areas so as to exclude areas that must remain dark, in particular to avoid dazzling other vehicles. In addition, manufacturers are also faced with the constraint of optimizing the positioning of the various elements making up the light module in order to achieve the light module occupying the smallest possible space while allowing varied lighting configurations and sufficient lighting efficiency in order to achieve a light module that is as easily arranged as possible with the most efficient lighting possible.

[0004] In order to best achieve these different objectives and in particular to obtain the most compact module possible, there are technical solutions implementing a module comprising a reflector and a mirror whose role is to reflect light rays so that the incident light rays (on the mirror) have a direction leading to an arrangement which optimizes the size of the module as much as possible and so that the reflected light rays (by the mirror) are still directed to pass through a projection lens.

[0005] However, this type of technical solution has disadvantages, including the fact that it is limited in terms of lighting efficiency and the possibilities for different lighting configurations.

[0006] An object of the present invention is therefore to propose a light module making it possible to overcome all or part of the drawbacks cited.

[0007] Other objects, features, and advantages of the present invention will become apparent from the following description and accompanying drawings. It is understood that other advantages may be incorporated. SUMMARY

[0008] To achieve this objective, according to one embodiment, a light module for a motor vehicle is provided, comprising at least two light sub-modules superimposed in a superposition direction, each of the at least two sub-modules comprising at least one light source, a reflector, a mirror and a projection device, in which: - in each sub-module, the at least one light source is configured to illuminate the reflector, and the mirror is configured to reflect towards the projection device the light reflected by the reflector, forming a virtual image of the reflector, - in each sub-module, the projection device,the mirror and the reflector are positioned between them so that the object focus of the projection device is positioned between the front edge and the rear edge of the virtual image of the reflecting surface of the reflector or less than 10 mm from the rear edge of the virtual image of the reflecting surface of the reflector along the optical axis of the projection device, the module further comprising a support extending along a support plane and on which all the light sources of the sub-modules are positioned, the light module is characterized in that: - the support plane is oriented so as to comprise an axis parallel to the direction of superposition, - the projection device of each sub-module comprises an optical axis,the optical axes of each of the projection devices of the sub-modules being parallel;- the support plane is oriented so as to intersect the optical axis of each of the projection devices by forming an angle α different from 90° and -90° with a projection of the optical axis considered on a plane normal to the direction of superposition, and- the mirror of each sub-module extends along a plane defined by a first straight line which is the intersection of the support plane and a horizontal plane containing the optical axis of the projection device of said sub-module and by a second straight line which is the bisector between a normal to the support plane and a normal to the horizontal plane containing the optical axis of the projection device of the sub-module.,

[0009] Due to the configuration of the various elements of the light module, this light module makes it possible to significantly reduce the size of the light module while making it possible to obtain various light illumination configurations as well as significant light output. Indeed, due to the positioning of the support plane, supporting all the light sources, so as to comprise an axis parallel to the superposition direction and so as to be intersecting with a module optical axis direction, to which all the optical axes of the projection devices of the sub-modules are parallel, according to a multitude of angles,of the positioning of the mirror of each of the sub-modules so that it extends along a plane defined by a first straight line which is the intersection of the support plane and a horizontal plane containing the optical axis of the projection device of the sub-module and by a second straight line which is the bisector between a normal to the support plane and a normal to the horizontal plane containing the optical axis of the projection device of the sub-module, and of the integration of the reflectors of each sub-module, the invention makes it possible to obtain a large number of distinct light illumination configurations and in particular to produce all or part of a dipped beam and / or a main beam supplementary light. In particular, the light module according to the invention makes it possible to produce different light beams, and this, from a single support plane for all the sub-modules. In addition,the configuration of the module can be adapted according to the shape you want to give it and the space available around the module, by choosing the value of the angle α.,

[0010] In addition, the integration of a single reflector for each sub-module and its positioning relative to the mirror makes it possible to avoid light rays that would be reflected by the mirror towards a direction different from that in which the projection device is located. In particular, in each sub-module, the light rays coming from the at least one light source are reflected by the reflector towards the mirror, and the mirror reflects the rays that it receives towards the projection device, and not towards the reflector or the support.

[0011] Furthermore, integrating a mirror into each of the sub-modules allows all the module's light sources to be positioned on the same plane. Thus, a single support can hold the light sources of the sub-modules. This also reduces the size of the light module and its complexity.

[0012] Another aspect relates to a light projector comprising a light module and a housing closed by a closing wall, the light module being arranged inside the housing in such a way that light rays from the at least one light source of each sub-module are emitted through the closing wall. Another aspect is a vehicle equipped with at least one such module and / or at least one such projector, in particular for lighting towards the front of the vehicle. BRIEF DESCRIPTION OF THE FIGURES

[0013] The aims, objects, as well as the characteristics and advantages of the invention will emerge more clearly from the detailed description of an embodiment thereof which is illustrated by the following accompanying drawings in which:

[0014] The figure represents a light module according to an embodiment of the invention in which the support, the light sources, the reflectors, the mirrors and the projection devices of the superimposed sub-modules can be observed.

[0015] Larepresents a sub-module according to an embodiment of the invention in which the light sources, the reflector, the mirror and the projection device as well as the image of the reflector by the mirror can be observed.

[0016] La represents the sub-module of la on which the paths of light rays from light sources to the crossing of the projection device can be observed.

[0017] The represents a light sub-module according to an embodiment of the invention in which the configuration of the different elements of the sub-module makes it possible to produce a near-field light of a dipped beam.

[0018] The represents a light sub-module according to an embodiment of the invention in which the configuration of the different elements of the sub-module makes it possible to produce a main beam supplementary light.

[0019] The figure represents a motor vehicle seen from the front in which the light module according to an embodiment of the invention in which the light module is positioned in a housing in order to form the headlight and in which a housing is positioned on each side of the vehicle.

[0020] The drawings are given by way of example and are not limiting of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily to the scale of practical applications. DETAILED DESCRIPTION

[0021] Before commencing a detailed review of embodiments of the invention, optional features which may optionally be used in combination or alternatively are set out below:

[0022] According to one example, at least one sub-module 1 is configured to emit a light beam forming or participating in forming a main beam supplementary light.

[0023] According to one example, at least one sub-module 1 is configured to emit a light beam forming or participating in forming a light beam with a higher cut-off, such as that of a dipped beam. For example, the sub-module 1 can form or participate in forming a near-field beam of a dipped beam, otherwise called a flat beam (an English term evoking the “flattened” nature of the shape of the beam). According to another example, the sub-module 1 can form or participate in forming a cut-off beam of a dipped beam, otherwise called a kink beam (an English term evoking the “elbow” shape of the beam).

[0024] According to an example, the angle α is included in the following intervals: between -90° exclusive and -5° inclusive and between 5° inclusive and 90° exclusive.

[0025] Thus, thanks to this configuration, the support plane 8 in which the support 11 extends is not perpendicular to the optical axes 9 of the projection devices, that is to say also to the optical axis direction of the module. For each sub-module, this allows, due to the orientation of the reflector and the light source relative to the optical axis of the projection device, that the light rays coming from the light sources are directed in the desired manner towards the projection device. Also, this configuration makes it possible to orient the support 11 and the reflectors 3 (and more precisely the virtual image of the reflectors 3) in different directions so as to form the beams having the desired characteristics (and in particular according to their desired horizontal position, the mirror associated with the reflector ensuring a sort of straightening of the beam).Furthermore, excluding the angles from 0° to 5° and from -5° to 0° ensures that the reflectors 3 send light to the mirrors 5.

[0026] In sub-modules 1, mirror 5 is planar. However, the term planar is understood to mean small variations in curvature. For example, mirror 5 may have a slight curve, and in particular a radius of curvature greater than 100 mm and preferably greater than 200 mm.

[0027] In this case, the mirror is similar to a plane mirror, because given its dimensions, in relation to its radius of curvature, the mirror appears to be plane for the rays it receives.

[0028] This slight curve simply makes it possible to make a more robust mirror.

[0029] Thus, the flat nature of the plane mirror 5 makes it possible to create a symmetrical image of the object relative to the plane of the mirror, without changing its size. The plane mirror 5 then functions as a deflecting mirror.

[0030] According to one example, in at least one sub-module 1, the front edge 7a of the virtual image 7 of the reflector 3 is positioned between the projection device 6 and the rear edge of the virtual image of the reflector.

[0031] According to one example, each projection device 6 comprises a projection lens 6b, the projection lenses of the sub-modules 1 being superimposed on top of each other in the superposition direction 2.

[0032] According to one example, each projection device 6 consists of a projection lens 6b.

[0033] According to one example, the projection lenses 6b of at least two sub-modules 1 are formed in a single block. Optionally, the projection lenses 6b of each sub-module 1 are formed in a single block.

[0034] Thus, thanks to this configuration, the production, for example by injection, of projection lenses is facilitated as well as their positioning and orientation in space.

[0035] According to one example, in at least one sub-module 1, the reflector 3 has an elliptical profile, one of the foci of which is positioned on the light source. The second focus is positioned before or after the virtual image 13 of the projection device 6. In particular, when the second focus is positioned before the virtual image 13 of the projection device 6, it is positioned after the front edge 7b of the reflective surface of the reflector 3.

[0036] According to one example, in at least one sub-module 1, the reflector 3 is integral with the support 11. Optionally, the reflectors 3 of each of the sub-modules are integral with the support 11.

[0037] According to one example, in at least two sub-modules 1, the reflectors 3 and the mirrors 5 are integral with the support 11. Optionally, the reflectors 3 and the mirrors 5 of each of the sub-modules 1 are integral with the support 11.

[0038] Thus, this configuration allows the rotation of the support 11 relative to the vertical axis to cause a modification of the position of the reflectors and the mirrors and therefore allows the light beam to be formed having the desired characteristics.

[0039] According to one example, the reflectors 3 and the mirrors 5 of at least two sub-modules 1 are made in a single piece. Optionally, the reflectors 3 and the mirrors 5 of each of the sub-modules 1 are made in a single single piece.

[0040] In fact, thanks to the arrangement of the mirrors in relation to the reflectors, it is possible to produce a single part comprising the mirrors and the reflectors. The design of the light module is then simplified.

[0041] In the characteristics set out herein, the terms relating to verticality, horizontality or transversality (or lateral direction or position), or their equivalents, are understood in relation to the position in which the light module is intended to be mounted in a vehicle. The terms "vertical" and "horizontal" are used in this description to designate directions, following an orientation perpendicular to the plane of the horizon for the term "vertical" (which corresponds to the height of the systems), and following an orientation parallel to the plane of the horizon for the term "horizontal". They are to be considered in the operating conditions of the module in a vehicle. The use of these words does not mean that slight variations around the vertical and horizontal directions are excluded from the invention.For example, an inclination relative to these directions of the order of + or – 10° is here considered as a minor variation around the two preferred directions. Relative to the horizontal plane, the inclination is in principle between -5° and +4° and it is between -6° and +7.5° laterally.

[0042] In the context of this description, the adjectives "lower" and "upper" and their equivalents (under, below, on, above) are to be taken in relation to the vertical direction, that is to say the direction perpendicular to the horizontal plane. In the same context, a higher element is located above (but not necessarily in contact with, nor directly in line with) a lower element, following the vertical direction.

[0043] It is specified that in the context of the present invention, the words "top" and "bottom" are to be taken into account in relation to a horizontal plane. Thus, the element which is at the top is positioned above that which is positioned at the bottom.

[0044] The term "rear edge" means the rearmost part of the virtual image of the reflector relative to the one positioned furthest forward (i.e. the one closest to the projection device). In the context of the present invention, this "rear edge" is considered to be a volume less than or equal to 15% of the total volume of the virtual image of the reflector.

[0045] It is specified that in the context of the present invention, the expression "positioned less than 10 mm from the rear edge of the virtual image" means that the positioning can be carried out at most 10 mm from the end of the rear edge of the virtual image, that is to say that the positioning can be carried out at most 10 mm from the end of the rear edge of the virtual image considering all possible directions.

[0046] According to one embodiment, shown with five sub-modules 1, a light module for a motor vehicle is provided comprising at least two light sub-modules 1 positioned one above the other in a superposition direction 2. This configuration makes it possible to form a light module extending vertically. Figures 2 and 3 show more precisely that each of the at least two sub-modules 1 comprises at least one light source 4, a reflector 3 having a cap-shaped reflecting surface, a mirror 5 and a projection device 6.

[0047] The reflective surface of the reflector 3 is capable of collecting and reflecting the light rays emitted by the at least one light source and is arranged opposite the at least one light source with which it is associated. The reflective surface of the reflector 3 can be positioned facing or opposite the at least one light source. The projection device 6 is capable of projecting the beam formed by the light rays having been reflected by the mirror 5.

[0048] The mirror 5 is configured to receive and return the light rays coming from the at least one light source, and reflected by the reflector 3, towards the projection device 6. The diagram shows the path of certain light rays from the source 4, passing through the reflector 3 then the mirror 5 before impacting the projection device 6; generally speaking, the entire projection device, typically a lens or a train of lenses, is impacted by the beam over its entire input diopter (the rays shown in the drawing are therefore only very partial). The mirror 5 is configured to form a virtual image 7 of the reflector 3, and of its reflective surface following the interception of the light rays coming from the at least one light source 4 with the mirror 5. The mirror 5 is also configured to form a virtual image of the at least one light source 4.The mirror 5 is also configured to form a virtual image 13 of the projection device 6.

[0049] The mirror 5 extends in a plane. It will be understood that this does not exclude the possibility that the mirror 5 may have a slight curve, and in particular a radius of curvature greater than 100 mm and preferably 200 mm. Indeed, the curve given to the mirror 5 makes it possible to prevent the mirror 5 from deforming (and thus to have a more solid part) while maintaining good imaging quality. However, the radius of curvature is sufficiently large compared to the dimensions of the mirror so that it appears as a plane for the rays which encounter it.

[0050] In each sub-module 1, the projection device 6, the mirror 5 and the reflector 3 are positioned between them so that the object focus 6a of the projection device 6 is located close to the virtual image of the reflecting surface of the reflector 3. In particular, the object focus 6a of the projection device may be located between the front edge 7a and the rear edge of the virtual image 7 of the reflecting surface 3, along the optical axis of the projection device 6. According to one example, the object focus 6a of the projection device 6 is located at the rear edge of the virtual image 7, at a distance of less than 10 mm from the rear edge. The projection device 6 thus has the role of creating the image of the virtual image of the light sources 4 and the reflector 3.

[0051] The module further comprises a support 11 visible in figures 1, 4 and 5, extending along a support plane 8 and on which all the light sources 4 of the sub-modules 1 are fixed. The support plane 8 comprises a straight line parallel to the straight line of extension of all the projection devices 6, that is to say parallel to the direction of superposition 2.

[0052] In the case where the superposition direction is the vertical direction, the support plane 8 is directed so as to intersect the optical axis 9 of the projection device 6 by forming an angle α different from the right angle (in both directions of space) with the optical axis 9, in projection in a horizontal plane. In the case where the superposition direction is not the vertical direction, the support plane 8 is directed so as to intersect the optical axis 9 by forming an angle α different from the right angle (in both directions of space) with a projection of the optical axis 9 on a plane normal to the superposition direction 2.

[0053] The mirror 5 is oriented so that at least a portion of the rear edge of the virtual image of the reflecting surface of the reflector is located in a horizontal plane 10. In other words, the mirror 5 is constructed so that its reflection plane is between the support plane 8 and the horizontal plane 10. The reflection plane of the mirror 5 is thus the plane of symmetry between the support plane 8 and the horizontal plane 10. According to the invention, the mirror of each sub-module extends along a plane defined by a first straight line which is the intersection of the support plane 8 and a horizontal plane containing the optical axis of the projection device 6 and by a second straight line which is the bisector between a normal to the support plane 8 and a normal to the horizontal plane containing the optical axis of the projection device of the sub-module.The bisector chosen can be the bisector of the acute angle or the obtuse angle formed between the normal to the support plane 8 and the normal to the horizontal plane containing the optical axis of the projection device of the sub-module chosen. There are thus two possible positions for the orientation of the mirror. The choice between these two positions will be made according to the lighting function that one wishes to achieve and the orientation of the light sources on the support determining their direction of light emission.

[0054] The definition of the second line which defines the plane of the mirror, amounts to saying that the mirror 5 is in a plane of symmetry between the plane of the support 8 and a horizontal plane. This is valid whatever the bisector chosen.

[0055] This orientation of the mirror 5 makes it possible to create a virtual image of the sources with the desired orientation, namely that the virtual sources are thus configured to emit light rays in a vertical direction.

[0056] This also means that the virtual image of the support plane 8 becomes a horizontal plane. In particular, each mirror 5 makes a virtual image of the support plane 8, we then obtain a plurality of virtual planes superimposed horizontally. In other words, we obtain a plurality of horizontal virtual planes superimposed along the direction of superposition.

[0057] It is understood that each mirror 5 is located in a specific plane corresponding to the light projection to be carried out for a given sub-module; thus, the mirrors 5 of the different sub-modules 1 will generally be oriented in distinct planes defined for each sub-module by the optical axis of the projection device of the latter, and the projection to be carried out from the light source 4 and the reflector 3. If, for all the light sub-modules 1, the same bisector is chosen to define the second straight line defining the plane in which the mirror extends, then the mirrors 5 of the different sub-modules 1 are all oriented in parallel planes, as is the case in the.If, for some light sub-modules, the bisector of the acute angle is chosen, and for other light sub-modules, the bisector of the obtuse angle is chosen, then the mirrors 5 of the sub-modules for which the bisector of the acute angle is chosen to define the plane in which the mirror extends are oriented in first parallel planes, and the mirrors of the sub-modules for which the bisector of the obtuse angle is chosen to define the plane in which the mirror extends are oriented in second parallel planes, these second parallel planes not being parallel to the first parallel planes.

[0058] In the embodiment where it is desired to produce a beam without cut-off, for example for a road supplement, the object focus 6a is preferably located, on the reflective surface of the virtual image 7 of the reflector 3, between the front edge and the rear edge of the latter, preferably at the location producing the maximum light intensity. This configuration emerges from the positioning of the object focus 6a of the.

[0059] In the embodiment where it is desired to produce a cut-off beam, the object focus 6a is advantageously located at the rear edge to clearly image the cut-off, as is apparent from the embodiment of the. The fact that the mirror 5 is oriented so that at least a portion of the rear edge of the virtual image 7 is located in a horizontal plane 10 makes it possible to form a clear horizontal cut-off by imaging the rear edge by the projection device 6 (typically a lens).

[0060] More specifically, given that the symmetrical positioning of the reflection plane of the mirror 5 between the support plane 8 and the horizontal plane 10 can be obtained according to several configurations, depending on the configuration chosen, in particular according to the bisector chosen to define the plane in which the mirror extends, it is possible to form the desired beam. Indeed, depending on the orientation of the reflection plane of the mirror 5 between the support plane 8 in which the support 11 extends and the horizontal plane 10, several beam configurations can be obtained.

[0061] Indeed, the support plane 8 has two directions of normals (one positive and one negative). In the same way, the normal to the horizontal plane 10 containing the optical axis of the projection device of the sub-module considered can also be in two directions (one positive and one negative). Taking into account the two directions of the normal of the support plane 8 and the two directions of the normal to the horizontal plane, four orientation possibilities are possible for the choice of the bisector defining the plane in which the mirror extends, and therefore four orientation possibilities are possible for the plane in which the mirror 5 extends (i.e. oriented in the space present between the two normals chosen according to their chosen positive or negative direction) are possible and therefore 4 virtual images of the reflector are possible where the virtual sources are also configured to emit light rays along the vertical axis.However, since only the direction of the chosen bisector matters, but not its direction, among these four possibilities, only two give different orientations of the mirror plane. Thus, we obtain a first possible orientation if we choose the bisector of the obtuse angle, whatever its direction, and a second possible orientation if we choose the bisector of the acute angle, whatever its direction.

[0062] Then, depending on the side of the support on which the light sources are arranged, that is to say, depending on the direction of emission of the light sources chosen, and therefore the direction of emission of the light rays chosen, the sub-module will be configured to participate in the formation of a main beam supplement, or a dipped beam.

[0063] Each of these configurations allows the virtual image of the support plane 8, formed by the mirror 5 of each sub-module 1, to become a horizontal plane. The mirror 5 of each sub-module 1 then acts as an optical rectifier, making it possible to bring the beam to be projected back to the horizontal via the projection device, and, typically, the beam edge corresponding to the rear edge of the reflector. In other words, the mirror 5 makes it possible to make the virtual sources appear to emit light beams in the vertical direction (upwards or downwards). Thus, the projection device makes it possible to operate as if the light sources were arranged in superimposed horizontal planes, on which sources are arranged.

[0064] Since each mirror 5 of the light module forms a virtual image of the support plane 8, a plurality of virtual planes is then formed, and they are advantageously parallel to each other.

[0065] Illustrates an example of a light module according to the invention comprising several sub-modules 1. Illustrates a particular example of sub-module 1 on which one can see the at least one light source 4, the reflector 3, the mirror 5 and the projection device 6. As well as the virtual image 7 of the reflector 3 and the virtual image 13 of the projection device 6.

[0066] Illustrates the path of the light rays emitted by the at least one light source 4. The configuration of the different elements of the light module allows that after the light rays coming from the at least one light source 4 are reflected by the reflective surface of the reflector 3, they head towards the mirror 5 to then be returned towards the projection device 6 to form, depending on their position relative to the projection device 6, a light beam which can form or participate in forming a main beam supplement or a dipped beam.

[0067] The fact that the object focus 6a of the projection device 6 is between the front edge 7a and the rear edge of the virtual image 7 of the reflecting surface of the reflector 3 formed by the mirror 5 or less than 10 mm from the rear edge of the virtual image 7 of the reflecting surface of the reflector 3 formed by the mirror 5, along the optical axis of the projection device 6, allows the projection device 6 to project the light beam from the at least one light source to infinity. More precisely, the projection device 6 is therefore configured to image the reflecting surface illuminated by the at least one associated light source, in particular the portion of the reflecting surface in question where the virtual focus 6a is located.

[0068] More precisely, thanks to this configuration, the mirror 5 makes it possible to create a virtual image of the light sources 4 and the reflector 3. The projection lens 6b then has the role of creating the image of the virtual image of the light sources 4 and the reflector 3.

[0069] The reflective surface of the reflectors 3 advantageously has an elliptical or parabolic profile. It is advantageously a surface of revolution around an axis. Alternatively, it may be a free-form surface or a swept surface or an asymmetrical surface. It may also be multiple so as to comprise several sectors. The shell- or cap-shaped reflector 3 is advantageously made of materials having good heat resistance, for example glass or synthetic polymers such as polycarbonate (PC) or polyetherimide (PEI). The expression "parabolic type" generally applies to reflectors whose surface has a single focus, that is to say a zone of convergence of the light rays such that the light rays emitted by a light source placed at this convergence zone are projected over a great distance after reflection on the surface.Projected at a great distance means that these light rays do not converge towards an area located at least 10 times the dimensions of the reflector. In other words, the reflected rays do not converge towards a convergence zone or, if they converge, this convergence zone is located at a distance greater than or equal to 10 times the dimensions of the reflector. A parabolic surface may therefore have parabolic portions or not. A reflector having such a surface is generally used alone to create a light beam. Alternatively, it can be used as a projection surface associated with an elliptical reflector. In this case, the light source of the parabolic reflector is the convergence zone of the rays reflected by the elliptical reflector. The at least one light source 4 is arranged at a focus of the reflecting surface of the reflector 3 so that its rays are collected and reflected towards the mirror 5.

[0070] The mirrors 5 and the reflectors 3 of a sub-module 1 or of several sub-modules 1 can be produced in the same part.

[0071] As shown in, for each sub-module 1, the optical axis 9 of the projection device 6 can be positioned along the x-axis of a Cartesian coordinate system xyz. The vertical axis can be positioned along the z-axis of the Cartesian coordinate system xyz. The x-axis is parallel to the longitudinal axis of the motor vehicle when the lighting module is in the mounting and operational position on the motor vehicle. Under these conditions, the y-axis is horizontal.

[0072] The light module may comprise more than 2 light sub-modules. For example, it may comprise 3, 4, 5, 6, 7, 8, 9 or 10 light sub-modules 1. The illustrated light module comprises five sub-modules 1. It can be seen that each sub-module 1 comprises a reflector 3, a mirror 5, at least one light source 4 and a projection device 6.

[0073] In the illustration of the, all the reflectors 3 of the different superimposed sub-modules 1 have the same orientation in emitting light towards the lower face of their associated mirror 5; this is in accordance with the embodiment also visible in the. A reverse configuration, in which the reflectors 3 emit light towards the upper face of the associated mirror 5, is also possible; this is in accordance with the embodiment visible in the. In another variant, in the same module, one or more sub-modules 1 are associated with the relative orientation of the reflector 3 and the mirror 5 corresponding to that of the and one or more sub-modules 1 for which this orientation corresponds to that of the.

[0074] It can be noted that between la and la, the mirrors are oriented in different positions. In the case of la, for each sub-module 1, the bisector of the acute angle between the normal to the support plane and the normal to the horizontal plane containing the optical axis of the projection device of the sub-module was chosen to define the plane in which the mirror extends. In the case of la, for each sub-module 1, the bisector of the obtuse angle between the normal to the support plane and the normal to the horizontal plane containing the optical axis of the projection device of the sub-module was chosen.

[0075] The configuration of the sub-modules of the, and in particular the orientation of the reflectors 3, the mirrors 5, the support 11 and the sources on the support, is particularly suitable for the sub-modules 1 to participate in the realization of a dipped beam function. The configuration of the sub-modules 1 of the, and in particular the orientation of the reflectors 3, the mirrors 5, the support 11 and the sources on the support, is particularly suitable for the sub-modules 1 to participate in the realization of a high beam function.

[0076] Generally speaking, when the orientations of the different elements of a sub-module are arranged so that the virtual image of the reflector has a downward-facing reflective surface, as for example on the, the sub-module will be particularly suitable for contributing to the production of a dipped beam; and when the orientations of the different elements of a sub-module are arranged so that the virtual image of the reflector has an upward-facing reflective surface, as for example on the, the sub-module will be particularly suitable for contributing to the production of a main beam.

[0077] Advantageously, there may be a single light source 4 for a reflector 3. Alternatively, there may be several light sources for a reflector 3. For example, there may be two light sources 4 for a reflector 3, three light sources 4 for a reflector 3 or four light sources 4 for a reflector 3. The reflector of such a sub-module 1 will then advantageously comprise as many caps as there are light sources in the sub-module 1.

[0078] The light sources 4 may be positioned more towards the rear edge 3a of the reflector 3 than the front edge; this may correspond to the placement of the at least one source near the focus closest to the rear edge 3a of the ellipsoidal or parabolic surface which forms the reflector.

[0079] Preferably, the joining of the beams formed by all or only part of the sub-modules 1 allows the projection of a single beam which can be all or part of a main beam or additional main beam, or a dipped beam.

[0080] The superposition direction 2 may be vertical or may be inclined relative to the vertical backwards (around y) and / or laterally (around x). For an inclination around y, this inclination may have a value between -60° and 60° around the vertical direction; this interval is preferably between -45° and 45°. For an inclination around x, the interval may be between -90° and 90°, which means that this direction may possibly be horizontal. This inclination makes it possible in particular to facilitate the integration of the light module into a motor vehicle.

[0081] According to a preferred example, one light module may be positioned on the left side and one light module may be positioned on the right side at the front of the motor vehicle.

[0082] According to the invention, the at least one light source may be a light-emitting diode, also called a LED or LED.

[0083] The use of a single support 11 for all the sub-modules of the light module makes it possible to simplify the construction and assembly operations of the light module.

[0084] The support 11 may be composed of several parts.

[0085] The support 11 may be an external surface of a printed circuit board (PCB).

[0086] According to an advantageous example, at least one first sub-module 1 is configured to emit a light beam forming or participating in forming a main beam supplementary light.

[0087] According to a preferred example, at least one second sub-module 1 is configured to emit a light beam forming or participating in forming a light beam with an upper cut-off, for example a dipped beam. For this configuration (and more precisely when upper cut-offs for the dipped beam are formed), the object focus 6a of the projection device 6 is positioned at + / - 10 mm from the rear edge of the virtual image of the reflective surface of the reflector 7.

[0088] Preferably, at least one third sub-module 1 is configured to emit a light beam forming or participating in forming a near-field beam of dipped beam.

[0089] The low beam cut-off beam is used to define a cut-off area. The low beam near field beam can also be called a "flat" beam for flat or spread beam. It is projected generally below the cut-off and is used to illuminate the near field in front of the vehicle. Thus, the combination of the near field beams and the low beam cut-off beam makes it possible to at least partially define a low beam beam.

[0090] The dipped beam cut-off beam is therefore configured to produce, in dipped beam mode, a portion of dipped beam with cut-off. The resulting angled portion is often called the "kink" of the "dipped beam". Dipped beam type beams typically have a first lateral zone (normally on the edge of the roadway) projecting at a height slightly higher than in a second lateral zone (normally on the middle of the roadway), these two zones following each other laterally with the presence of a bend or bend between them.

[0091] A near-field beam from a dipped headlight is typically a relatively spread projection laterally in front of the vehicle, mostly or completely below the horizon line, generally seeking a good distribution of illumination across the entire illuminated area.

[0092] The invention can also participate in a main beam supplement function which has the function of illuminating the scene in front of the vehicle over a wide area, but also over a substantial distance, typically around two hundred meters. This light beam, due to its lighting function, is located mainly above the horizon line. In particular, it can be used to generate a lighting function of the "complementary" type which forms a portion of a main beam complementary to that produced by a near-field beam, the main beam supplement seeking entirely or at least mainly to illuminate above the horizon line while the near-field beam (which can have the specificities of a dipped beam) seeks to illuminate entirely or at least mainly below the horizon line.The route complement can therefore be a main part of the overall “route” beam and be associated with another beam participating in the code.

[0093] Preferably, the reflector 3 of the at least one first sub-module 1 is configured so that after the projection device 6, the light beam from the light sources 4 is directed towards an upper part of the space located after the projection device 6. According to a preferred example, the reflector 3 of the at least one second sub-module 1 is configured so that after the projection device 6, the light beam from the light sources 4 is directed towards a lower part of the space located after the projection device 6. The upper part of the space located after the projection device 6 is positioned above (in a vertical direction perpendicular to the horizontal plane 10) the lower part of the space located after the projection device 6.

[0094] In the case where the reflector 3 of the at least one first sub-module 1 is configured in such a way that after the projection device 6, the light beam from the light sources 4 is directed towards a lower part of the space located after the projection device 6, the virtual rear edge of the reflector is at the bottom and the rest of the virtual reflector extends above the virtual rear edge (see).

[0095] In the case where the reflector 3 of the at least one second sub-module 1 is configured so that after the projection device 6, the light beam from the light sources 4 is directed towards an upper part of the space located after the projection device 6, the virtual rear edge of the reflector is at the top and the rest of the virtual reflector extends below ().

[0096] More specifically, the passages "a beam directed upwards in a vertical direction perpendicular to the horizontal plane" and "a beam directed downwards in a vertical direction perpendicular to the horizontal plane" are to be taken into account considering that the beam directed upwards can be projected above the horizon line and the beam directed downwards can be projected below the horizon line.

[0097] Advantageously, in at least one sub-module 1, the angle α is included in one of the following intervals: between -90° exclusive and -5° and between 5° and 90° exclusive. Preferably, the angle α is 32°.

[0098] According to an advantageous example, in at least one sub-module 1, the reflection surface of the mirror 5 is a flat surface.

[0099] According to a preferred example, in at least one sub-module 1, the front edge 7b of the virtual image 7 is closer to the projection device 6 than the rear edge 7a.

[0100] Preferably, each projection device 6 comprises a projection lens 6b. The projection lenses of the sub-modules 1 are positioned one above the other in the superposition direction 2.

[0101] According to one example, the projection lenses 6b of at least two sub-modules 1 form a single piece having no separation between the different projection lenses 6b. For example, it is possible to have a smooth and continuous exit face, and an entry face comprising entry diopters of each sub-module 1, each of these entry diopters forming a bump. The overall entry face then has discontinuities formed by the junction of the entry diopters of two juxtaposed lenses.

[0102] Advantageously, in at least one sub-module 1, the reflector 3 has an elliptical or parabolic profile whose concavity is directed towards the at least one light source 4.

[0103] According to a preferred example, in at least one sub-module 1, the reflector 3 is fixed to the support 11.

[0104] Preferably, in at least two sub-modules 1, the reflectors 3 and the mirrors 5 are fixed to the support 11.

[0105] According to an advantageous example, the light projector comprises a light module and a closed housing 12 comprising a closing wall 12a. The light module is positioned inside the housing 12 so that light rays from the at least one light source 4 of each sub-module 1 can pass through the closing wall 12a.

[0106] The invention is not limited to the embodiments previously described and extends to all embodiments covered by the invention.

[0107] List of references: 1. light sub-modules 2. direction of superposition 3. reflector 3a. front edge of the reflector 5. mirror 6. projection device 6a. object focus 6b. projection lens 7. virtual image 7a. front edge of the reflector 7b. front edge of the virtual image 8. support plane 9. optical axis 10. horizontal plane 11. support 12. housing 12a. closing wall 13. virtual lens 14. bisector α. angle

Claims

Light module for a motor vehicle, comprising at least two light sub-modules (1) superimposed along a superposition direction (2), each of the at least two sub-modules (1) comprising at least one light source (4), a reflector (3), a mirror (5) and a projection device (6), in which: in each sub-module (1), the at least one light source (4) is configured to illuminate the reflector (3) and the mirror (5) is configured to reflect towards the projection device (6) the light reflected by the reflector (3), forming a virtual image (7) of the reflector (3), in each sub-module (1), the projection device (6),the mirror (5) and the reflector (3) are positioned between them so that the object focus (6a) of the projection device (6) is positioned between the front edge (7a) and the rear edge of the virtual image (7) of the reflective surface of the reflector (3) or less than 10 mm from the rear edge of the virtual image (7) of the reflective surface of the reflector (3) along the optical axis of the projection device (6),the module further comprising a support (11) extending along a support plane (8) and on which all the light sources (4) of the sub-modules (1) are positioned,characterized in that:the support plane (8) is oriented so as to comprise an axis parallel to the superposition direction (2),the projection device (6) of each sub-module (1) comprises an optical axis (9),the optical axes (9) of each of the projection devices (6) of the sub-modules (1) being parallel; the support plane (8) is oriented so as to intersect the optical axis (9) of each of the projection devices (6) by forming an angle (α) different from 90° and -90° with a projection of the optical axis (9) considered on a plane normal to the superposition direction (2), and the mirror (5) of each sub-module (1) extends along a plane defined by a first straight line which is the intersection of the support plane (8) and a horizontal plane (10) containing the optical axis (9) of the projection device (6) of said sub-module and by a second straight line which is the bisector (14) between a normal to the support plane (8) and a normal to the horizontal plane (10) containing the optical axis of the projection device (6) of the sub-module (1)., Light module according to the preceding claim in which at least one sub-module (1) is configured to emit a light beam forming or participating in forming a main beam supplementary light. Light module according to any one of the preceding claims in which at least one sub-module (1) is configured to emit a light beam forming or participating in forming a light beam with an upper cut-off, such as a dipped beam. Light module according to any one of the preceding claims in which the angle (α) is included in the following intervals: between -90° exclusive and -5° inclusive and between 5° inclusive and 90° exclusive. Light module according to any one of the preceding claims wherein in at least one sub-module (1), the front edge (7a) of the virtual image (7) of the reflector (3) is positioned between the projection device (6) and the rear edge of the virtual image (7) of the reflector (3). Light module according to any one of the preceding claims in which each projection device (6) comprises a projection lens (6b), the projection lenses of the sub-modules (1) being superimposed on each other in the superposition direction (2). Light module according to the preceding claim in which the projection lenses (6b) of at least two sub-modules (1) are formed in a single block. Light module according to any one of the preceding claims, in which in at least one sub-module (1), the reflector (3) is integral with the support (11). Light module according to any one of the preceding claims in which, in at least two sub-modules (1), the reflectors (3) and the mirrors (5) are integral with the support (11). Light module according to any one of the preceding claims in which the reflectors (3) and the mirrors (5) of at least two sub-modules (1) are made in a single piece. Light projector comprising a light module according to any one of the preceding claims and a housing (12) closed by a closing wall (12a), the light module being arranged inside the housing (12) so that light rays from the at least one light source (4) of each sub-module (1) are emitted through the closing wall (12a).

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