OPTICAL MODULE OF A MOTOR VEHICLE LIGHTING SYSTEM

Description

[0001] The invention relates to the field of lighting systems for motor vehicles. More specifically, the invention relates to an optical module for a motor vehicle lighting system.

[0002] In the field of automotive lighting and signaling, it is common practice to project logos or illuminated patterns onto the ground in close proximity to the vehicle, in addition to standard functions. This type of function can be used, for example, in driver assistance systems, such as creating lane markings. It can also support traditional signaling functions, alerting other road users to a change in trajectory.

[0003] To project an illuminated design or logo onto the ground, a common solution is to introduce dark areas into a pixelated light beam emitted by the vehicle's lighting system. The driver or other road user then perceives the design or logo through the contrast between dark and illuminated areas. However, this solution requires a particularly high-resolution light beam and therefore a large number of light sources, making the lighting system expensive and complex.

[0004] Another known solution involves projecting light from a light source through a mask with a perforation whose outline matches that of the design or logo to be projected onto the floor. While this solution is much less expensive than the previous one, it is not effective because a large portion of the light is blocked or absorbed by the mask.

[0005] There is therefore a need for an optical module that can project a luminous pattern or logo onto the ground, which is reasonably priced and effective.

[0006] Document WO 2021 / 052837 A discloses an optical module for ground projection constituting a known solution meeting this need.

[0007] The present invention falls within this context and also aims to address this need.

[0008] The invention is defined by claim 1. It relates to an optical module of a lighting system for a motor vehicle, comprising: a. at least one selectively controllable light source, b. a primary optical element comprising at least one primary optical member connected to an output optical member, said primary optical member having a light-inlet face opposite which said light source is disposed and a junction face connecting said primary optical member to the output optical member, the primary optical element being a single piece, and c. an optical projection system arranged to project onto the ground, from the light emitted by said light source and collected by said primary optical member, an image of said junction face of said primary optical member, said primary optical member being arranged so that the image of its junction face projected onto the ground by the optical projection system is entirely delimited by substantially sharp edges.

[0009] In the invention, the primary optical element is connected to the output optical element via its junction face. The light emitted by the light source passes through the input face of this primary optical element and propagates within it, thus entering the output optical element via this junction face, which thereby forms a virtual output face of the primary optical element. All the light emitted by the light source and collected by this primary optical element is thus used to form, at the junction face of this element, a predefined pattern that corresponds substantially to the one to be projected onto the ground. Since the primary optical element is a single piece, this light undergoes little or no deviation as it passes from the primary optical element to the output optical element.It should be noted that this output element provides, among other things, a base for supporting the primary optical element, without impacting the module's optical performance, and may even contribute to improving it. An image of this pattern can thus be projected onto the ground by the optical projection system without its sharpness, essentially defined by the primary optical element, being affected by the output optical element. The invention therefore makes it possible, for an acceptable number of elements and thus at a reasonable cost and complexity, to project a luminous pattern or logo onto the ground, making optimal use of the light emitted by a light source.

[0010] In the present invention, the luminous pattern forms a logo, a pictogram, a geometric pattern, or a set of several logos, pictograms, or geometric patterns, as well as combinations thereof, such as a pictogram associated with one or more geometric patterns. Advantageously, a geometric pattern whose shape is easily recognizable will be chosen, such as any polygon or regular polygon, chevrons, triangles, or circles.

[0011] In the invention, "substantially sharp edge of an image projected onto the ground" means that the variation in ground illumination caused by this projection, between two points located on either side of this edge in a direction substantially perpendicular to the edge and separated by at least 1 cm, has a slope, in particular at at least one point, greater than or equal to 10 lux / cm.

[0012] Advantageously, the optical module includes: a. a plurality of selectively controllable light sources, b. a primary optical element comprising a plurality of primary optical organs connected to the same output optical organ, each primary optical organ having a light-inlet face opposite which one of said light sources is disposed and a junction face connecting said primary optical organ to the output optical organ, the primary optical element being a single piece, and c. an optical projection system arranged to project onto the ground, from the light emitted by each of the light sources and collected by each primary optical organ, an image of each of the junction faces of these primary optical organs, each primary optical organ being arranged so that the image of its junction face projected onto the ground by the optical projection system is entirely delimited by substantially sharp edges.

[0013] In one embodiment of the invention, the optical projection system is arranged to project onto the ground, in the immediate vicinity of the vehicle, the images of the junction faces projected onto the ground by the optical projection system. The immediate vicinity is defined as a projection distance of less than 10 meters, in particular less than 5 meters, and / or an overall projection direction forming an angle of at least 5° below the horizontal, in particular at least 10° below the horizontal. These images can thus contribute to a function indicating the trajectory followed by the vehicle, and in particular as a turn signal or reversing light.

[0014] Preferably, each selectively controllable light source comprises a light-emitting semiconductor chip, in particular a light-emitting diode. Preferably, each selectively controllable light source is capable of emitting white light. Alternatively, each selectively controllable light source is capable of emitting amber light. Alternatively still, each selectively controllable light source is capable of emitting light of a controllable color.

[0015] In one embodiment of the invention, said, in particular each primary optical element comprises a primary light guide. Where applicable, the entrance face of said, in particular each, light guide may be connected to the junction face of said light guide by an envelope such that each point on the contour of the entrance face is connected to a point on the contour of the junction face by a straight line. In other words, the envelope of the light guide is a developable surface. According to this feature, the light emitted by a light source through the entrance face of a primary optical element propagates within that primary optical element by total internal reflection on the walls of the light guide until it reaches the junction face. The fact that the envelope is a developable surface allows the formation, at the junction face, of a pattern entirely delimited by substantially sharp edges.

[0016] Advantageously, the entrance face of each primary optical element is substantially rectangular. Where applicable, the junction face of the primary optical element has a shape substantially different from that of its entrance face. Based on this characteristic, each primary optical element can be optimized to obtain, at its junction face, a predetermined pattern corresponding to the shape of that junction face, which can be distinct from one primary optical element to another, and which can be projected onto the ground as clearly as possible by the optical projection system.

[0017] Alternatively, the entrance face of said primary optical element may have a shape and / or orientation adapted to the contour of the pattern formed at the junction face of said primary optical element and arranged so that the light distribution within this contour is substantially homogeneous. For example, said entrance face may have the shape of a semicircle, a rhombus, or a distorted rectangle. Preferably, said junction face may have a different number of edges than said entrance face and / or edges with dimensions distinct from those of the edges of said entrance face and / or angles between the edges distinct from those between the edges of said entrance face. In particular, the shape of said junction face may be distinct from any shape that can be obtained by scaling the shape of said entrance face.For example, the said joining face may be substantially triangular, trapezoidal, or in the shape of a rhombus or pentagon.

[0018] If desired, at least two entrance faces of two primary optical organs have a distinct orientation from each other.

[0019] According to the invention, the module comprises an opaque shield disposed upstream of the output optical element and having at least one opening, or in particular a plurality of openings, said, or in particular each, primary optical element extending through said opening, or in particular one of said openings. Preferably, each opening is arranged so that its contour borders the primary optical element passing through it. This shield blocks or absorbs stray light rays that would escape from the primary optical elements before the junction face and penetrate the output optical element, thus preventing these stray rays from being projected onto the ground by the projection optical system, which would create unwanted light spots.

[0020] Advantageously, the primary optical elements are arranged one above the other. For example, the primary optical elements are arranged so that the image of the junction face of an upper primary optical element is projected onto the ground, by the optical projection system, upstream or downstream of the image of the junction face of a lower primary optical element arranged below that upper primary optical element. Alternatively, the primary optical elements can be arranged side by side along a horizontal axis.

[0021] According to one embodiment of the invention, the primary optical elements are connected to the output optical element such that the junction faces of at least two adjacent primary optical elements with the output optical element are spaced apart. This feature makes it possible to generate a gap between the images of the junction faces of these two adjacent primary optical elements, this gap being clearly delimited on the ground by the edges of these images.

[0022] According to another embodiment of the invention, cumulative or alternative, at least two primary optical elements join each other upstream of their junction faces, so as to be connected to the output optical element by a single junction face. This feature makes it possible to project a particularly long pattern onto the ground, such as a long line, which is not possible with a single primary optical element. The dimensions of the junction face in the case of a single primary optical element to produce such a pattern would imply that the rays emitted by the light source in the input face of this element and intended to form the ends of this line would arrive at such an angle that they would not be projected by the optical projection system. Conversely, combining several primary optical elements to obtain a single junction face makes it possible to obtain a large and homogeneous pattern.

[0023] Advantageously, the output optical element has a substantially smooth, dome-shaped output face. For example, the output optical element can be a truncated sphere or, alternatively, a truncated cylinder. This characteristic allows the output optical element to be equipped with a function for correcting the geometric aberrations introduced by the projection optical system when projecting the images of the junction faces onto the ground.

[0024] Preferably, the respective refractive indices of the primary optical elements and the output optical element are substantially identical. For example, the primary optical elements and the output optical element are made of the same material, and in particular, are made from the same polymer. By "same material," it is meant that the primary optical elements and the output optical element are made of materials derived from at least the same base polymer, for example, polycarbonate (or PC) or PMMA. However, these materials may have different fillers. Preferably, the primary optical elements and the output optical element can be formed from a single mold to create the primary optical element, this primary optical element thus being a single piece.

[0025] Alternatively, one or more, or even all, of the primary optical elements and the output optical element may be produced from separate molds and then assembled to form the primary optical element. If necessary, these primary optical elements produced from molds separate from that of the output optical element may be bonded to the output optical element using an adhesive with a refractive index substantially identical to those of the primary optical elements and the output optical element.

[0026] For example, the output optical element may have a notch formed in an upstream face opposite the output face, and at least one primary optical element having a base designed to be inserted into said notch such that a downstream face of the base is opposite the notch and forms the junction face of this primary optical element. In this example, it is thus possible for one of the primary optical elements to be manufactured independently of the output optical element, while another primary optical element is made with the output optical element, the notch ensuring that the junction faces of these primary optical elements are coplanar.

[0027] In another example, the primary optical elements form a single unit equipped with a base to which the primary optical elements are connected via their junction faces. This single unit is assembled with an output optical element such that a downstream face of the base is opposite an upstream face of the output optical element. In this case, the base and the output optical element together form the output optical element.

[0028] If desired, the primary optical element(s), produced from molds separate from that of the output optical element, may include mounting and positioning tabs designed to cooperate with the output optical element, for example, with the edges of the output optical element or with additional mounting tabs of the output optical element. These features ensure the precise relative positioning of the output optical element with the primary optical element(s).

[0029] Advantageously, the optical projection system has a focal surface passing substantially through the junction face of said primary optical element with the output optical element, in particular through the junction faces of said primary optical elements with the output optical element. For example, said focal surface may be a plane or a curved surface located substantially at the junction plane between the junction surfaces and the output optical element.

[0030] For example, the projection optical system comprises at least one lens and / or one reflector and / or a combination of at least one lens and at least one reflector. Preferably, the projection optical system may comprise a single projection lens whose focal surface passes substantially through the junction surfaces of the primary optical elements with the output optical element. It should be noted that the term "substantially" refers to a displacement of a few millimeters between the focal surface and the junction surfaces, which would allow for defocusing introduced by the output face of the output optical element.Alternatively, the optical projection system may include a substantially flat mirror arranged to form virtual images of the junction surfaces on one side of this substantially flat mirror, and a projection lens located on the other side of this substantially flat mirror, the focal surface of which passes substantially through these virtual images. This type of optical projection system allows for a significant reduction in the size of the optical module.

[0031] The invention also relates to a lighting system for a motor vehicle, comprising an optical module according to the invention, and a control unit for the light sources of said optical module.

[0032] For example, said lighting system may include a light device such as a rear light of a motor vehicle, and / or a front headlight of a motor vehicle, and / or a light device arranged in a bumper of a motor vehicle and / or in a rearview mirror of a motor vehicle, the optical module being arranged in this light device.

[0033] Advantageously, the control unit is capable of selectively controlling each of the light sources of said optical module according to an instruction received from a computer of the motor vehicle.

[0034] According to one example, the lighting system may include an additional optical module comprising at least one additional light source capable of emitting a signaling light beam, including regulatory ones, and the control unit may be arranged, according to an instruction received from a computer of the motor vehicle, to control in a synchronized manner said additional light source of the additional optical module and said light sources of the optical module.

[0035] For example, the additional optical module may be capable of emitting a regulatory direction indicator light beam and the control unit may be arranged, according to an instruction received from a computer of the motor vehicle, to control the emission of said light beam by the additional light source intermittently and to control the emission of light by each of the light sources of the optical module simultaneously with the emission of said light beam.

[0036] According to another example, the additional optical module may include several additional light sources and may be capable of performing a regulatory scrolling direction indicator type function and the control unit may be arranged, according to an instruction received from a computer of the motor vehicle, to control the sequential and / or progressive emission of light beams by the additional light sources and to control the emission of light by each of the light sources sequentially and / or progressively and in a manner synchronized with the sequential and / or progressive emission of said light beams.

[0037] The present invention is now described by means of purely illustrative and in no way limiting examples of the scope of the invention, and from the accompanying drawings, in which the various figures represent: [ Fig. 1 ] represents, schematically and partially, a cross-sectional view of an optical module according to an embodiment of the invention; [ Fig. 2 ] represents, schematically and partially, a perspective view of the primary optical element of the module of the [ Fig. 1 ] ; ] Fig. 3 ] represents, schematically and partially, a lighting system of a motor vehicle according to an embodiment of the invention and incorporating the optical module of the [ Fig. 1 ] ; And [ Fig. 4 ] represents, schematically and partially, a cross-sectional view of an optical module according to another embodiment of the invention.

[0038] In the description that follows, identical elements, by structure or by function, appearing on different figures retain, unless otherwise specified, the same references.

[0039] We have represented in [ Fig. 1 ] an optical module 1 of a lighting system of a motor vehicle according to a first embodiment of the invention.

[0040] The optical module 1 comprises a plurality of light-emitting diodes 2 mounted on the same printed circuit board 3. In the example described, the optical module 1 comprises three LEDs 2, each of which can be controlled independently of the others to emit white light.

[0041] The optical module 1 comprises a primary optical element 4 arranged downstream of the light-emitting diodes 2. This primary optical element 4 will be described in connection with the [ Fig. 2 ] which shows this element 4 in a rear perspective view.

[0042] The primary optical element 4 comprises a plurality of primary optical elements 5 and an output optical element 6 to which these primary optical elements 5 are connected. In the example described, the primary optical element 4 comprises three primary optical elements 5, each implemented in the form of a light guide. The primary optical elements 5 are arranged one above the other.

[0043] Each light guide 5 has an entrance face 51, opposite which is arranged one of the LEDs 2, the light that can be emitted by this LED 2 thus entering the light guide 5 through this entrance face 51.

[0044] Each light guide 5 is connected to the output optical element 6 by a junction face 52, opposite the input face 51, and located at the level of an upstream wall 61 of the output optical element 6.

[0045] For each light guide 5, the inlet face 51 is connected to the junction face 52 by an envelope 53. This envelope 53 is a developable surface, such that each point on the contour of the inlet face 51 is connected, via the envelope 53, to a point on the contour of the junction face 52 by a straight line. The light emitted by the LED 2 located opposite the inlet face 51 is thus coupled to the light guide 5 when it enters this light guide 5 through this inlet face 51, and propagates by successive total internal reflections against the envelope 53 until it reaches the junction face 52, where it is decoupled from the light guide 5 and enters the optical output element 6. The junction face 52 thus forms a fictitious output face of the light guide 5.

[0046] As can be seen in [ Fig. 2 The entrance faces 51 of the light guides 5 can be distinct from one another. In the example described, the entrance face 51 of the lower light guide has a semi-circular shape, while the entrance faces 51 of the central and upper light guides are rectangular. Other shapes than those described could be conceived, in particular diamond or distorted rectangle shapes, without departing from the scope of the present invention. Similarly, it could be conceived that all the shapes of the entrance faces 51 are distinct from one another, or that the dimensions of only some or all of the entrance faces 51 are distinct from one another, or that the orientations of only some or all of the entrance faces 51 are distinct from one another, without departing from the scope of the present invention.As will be described later, the choice of the shape of the entrance face 51 of a light guide 5 is mainly related to the shape of the junction face 52 of this guide 5 and to the desired light distribution at the level of this junction face 52.

[0047] Similarly, the junction faces 52 of the light guides 5 can be distinct from one another, and the junction face 52 of each light guide 5 is distinct from the entrance face 51 of that light guide 5. The junction face 52 of a light guide 5 thus defines, by virtue of its contour, a pattern whose shape is predetermined and specific to that light guide 5. The shape of the entrance face 51 and the envelope 53 of each light guide 5 thus makes it possible to utilize all the light emitted by an LED 2 through the entrance face 51 to obtain, at the junction face 52, a pattern entirely delimited by substantially sharp edges. Likewise, the shape of the entrance face 51 and the envelope 53 make it possible to obtain a homogeneous light distribution within this pattern, at the junction face 52.

[0048] In the example described, the junction face 52 of the lower light guide has a triangular shape, while the junction faces 52 of the central and upper light guides are trapezoidal, with the dimensions of the junction face 52 of the upper guide being smaller than those of the junction face 52 of the central guide. It should be noted that the semi-circular shape of the entrance face 51 of the lower guide is particularly well-suited for achieving a homogeneous light distribution at the junction face 52 of this lower guide, and that the rectangular shapes of the entrance faces 51 of the central and upper light guides are particularly well-suited for achieving a homogeneous light distribution at the junction faces 52 of these central and upper light guides.

[0049] Furthermore, the light guides 5 are arranged so that two adjacent junction faces 52 are spaced apart by a space 54.

[0050] The primary optical element 4 is a single piece, with the light guides 5 and the output optical element 6 made of the same material, namely polycarbonate or PC. In the example described, the primary optical element 4 is a single-piece molded component. In other words, the refractive index of the light guides 5 and the output optical element 6 is identical, and there are no diopters at the junction faces 52, so the light entering from the light guides 5 into the output optical element 6 undergoes no deviation at the junction faces 52.

[0051] The optical output element 6 has an output face 62, opposite the smooth, dome-shaped upstream face 61. More precisely, this output face 62 can be partially spherical, giving the optical output element 6 a truncated sphere shape. The output face 62 is centered on the junction face 52 of the central light guide 5. Consequently, the light from the junction faces 52 undergoes virtually no deviation as it exits the primary optical element 4 via this output face 62. The optical output element 6 thus forms a mounting support for the light guides 5, and it is possible to arrange mounting elements for the primary optical element 4 on this optical output element 6.

[0052] Optical module 1 includes a projection optical system 7. In the example of the [ Fig. 1 ], the optical projection system 7 is a projection lens 7 having a focal plane 71 passing substantially through the junction surfaces 52 of the light guides 5.

[0053] This projection lens 7 is thus arranged to project images of the junction faces 52 onto the ground in the near field. Since the patterns formed at the junction faces 52 are entirely delimited by sharp edges due to the light guides 5, and the focal plane 71 passes through these junction faces 52, these projected images on the ground are themselves entirely delimited by sharp edges, corresponding to the edges of these junction faces 52, after inversion by the projection lens 7. It should be noted that a distortion is introduced during the projection of the images by the projection lens 7, insofar as the projection is not carried out perpendicular to the ground. However, in the case of projection onto a plane orthogonal to the optical axis of the optical module, the projected images correspond precisely to the junction faces 52.

[0054] There [ Fig. 3 ] describes a lighting system 10 of a motor vehicle according to an example of an embodiment of the invention.

[0055] The lighting system 10 comprises a rear light 11 and a front headlight 12. The rear light 11 comprises a plurality of light sources, not shown, which can be controlled independently of each other. The optical module 1 of the [ Fig. 1 ] is arranged in the front projector 12.

[0056] The lighting system 10 includes a control unit (not shown) receiving instructions from a computer in the motor vehicle for the performance of lighting functions, and controlling the light sources of the rear light 11 and the LEDs 2 of the optical module 1 according to these instructions.

[0057] Upon receiving an instruction to emit a scrolling direction indicator type function, for example generated by the computer during a lane change of the motor vehicle, the control unit cyclically controls the light sources of the rear light 11, each cycle consisting of the progressive emission of three light beams 11a, 11b and 11c, from the inside to the outside of the motor vehicle, followed by the extinction of these three beams.

[0058] Simultaneously, for each cycle, the control unit activates the lower LED 2 simultaneously with the emission of the light beam 11a, the optical module 1 thus projecting onto the ground, in the vehicle's immediate vicinity, the image 1a of the junction face 52 of the lower light guide 5. The control unit then activates the central LED 2 simultaneously with the emission of the light beam 11b, the optical module 1 thus projecting onto the ground, in the vehicle's immediate vicinity, the image 1b of the junction face 52 of the central light guide 5, the lower LED 2 remaining activated. The control unit then activates the upper LED 2 simultaneously with the emission of the light beam 11c, the optical module 1 thus projecting onto the ground, in the vehicle's immediate vicinity, the image 1c of the junction face 52 of the upper light guide 5, the lower and central LEDs 2 remaining activated. Finally, the control unit deactivates all 2 LEDs simultaneously with the switching off of light beams 11a, 11b, and 11c.

[0059] It is thus understood that the optical module 1 performs a complementary direction indicator function to the scrolling direction indicator function performed by the rear light 11. Since the images 1a, 1b, and 1c are projected onto the ground in the near field of view of the vehicle, they are likely to be easily perceived by a road user traveling in front of the vehicle. The arrangement of the light guides 5 one above the other allows these images 1a, 1b, and 1c to be projected one behind the other, the spaces 54 between the junction faces 52 creating gaps between these images to further enhance their sharpness.

[0060] We have represented in [ Fig. 4 ] an optical module 20 of a lighting system of a motor vehicle according to a second embodiment of the invention.

[0061] In this example, the optical module 20 includes, as in the example of the [ Fig. 1 ], three LEDs 2 and a primary optical element 4 arranged downstream of the light-emitting diodes 2, the primary optical element 4 conforming to the example of the [ Fig. 1 ] and the [ Fig. 3 ].

[0062] The optical module 20 also includes an opaque cover 21 arranged upstream of the upstream face 61 of the output optical element 6. This cover 21 has a plurality of openings 22, each light guide 5 passing through one of these openings 22. This cover 21 thus makes it possible to block stray light rays which would escape from the light guides 5 before reaching the junction faces 52, so as to improve the sharpness of the edges of the patterns formed at the level of these junction faces 52.

[0063] Furthermore, the optical module includes an optical projection system 7 comprising on the one hand a plane mirror 72 and on the other hand a projection lens 73.

[0064] The plane mirror 72 is arranged downstream of the exit face 62 of the optical output member 6 and allows virtual images of the junction surfaces 52 to be formed behind this plane mirror 72. The projection lens 73 is located downstream of the plane mirror 72 and has a focal plane 74 passing substantially through the position of these virtual images, so that it can project images of these virtual images onto the ground.

[0065] The preceding description clearly explains how the invention achieves its objectives, namely to offer an optical module for projecting a luminous pattern or logo onto the ground, which is reasonably priced and effective, this optical module comprising a single-piece primary optical element combining primary optical organs capable of forming sharp patterns and an output optical organ allowing these primary optical organs to be maintained without impacting the optical performance of the module.

[0066] In any event, the invention is not limited to the embodiments specifically described in this document, and extends in particular to all equivalent means and to any technically feasible combination of these means. It may be considered, in particular, to use other types of light sources than those described, and especially light sources capable of emitting light of a color other than white or light whose color can be controlled. It may also be considered to use other shapes for the junction faces than those described. It may also be considered to use other lighting functions than those described, and in particular other functions for indicating a change in the trajectory of a motor vehicle, such as a reversing indicator or a lane change indicator, driver assistance functions, or even vehicle-to-vehicle communication functions.

Claims

1. Optical module (1, 20) of a luminous system (10) for a motor vehicle, comprising: a. at least one selectively controllable light source (2), b. a primary optical element (4) comprising at least one primary optical component (5) connected to an output optical component (6), said primary optical element having a light entry face (51) opposite which said light source is disposed and a junction face (52) connecting said primary optical element to the output optical element, the primary optical element being a single-piece component, and c. a projection optical system (7) arranged to project onto the ground, from the light emitted by said light source and collected by said primary optical element, an image (1a, 1b, 1c) of said junction face of this primary optical element, said primary optical element being arranged so that the image of its junction face projected onto the ground by the optical projection system is entirely delimited by substantially sharp edges, characterized in that the module comprises an opaque cover (21) disposed upstream of the optical output element (6), the opaque cover (21) having at least one opening (22), said primary optical element (5) extending through said opening.

2. Optical module (1, 20) according to the previous claim, wherein said primary optical element (5) comprises a primary light guide, the input face (51) of said light guide being connected to the junction face (52) of said light guide by an envelope (53) such that each point on the contour of the input face is connected to a point on the contour of the junction face by a straight line.

3. An optical module (1, 20) according to one of the preceding claims, wherein the input face (51) of said primary optical member (5) is substantially rectangular, and wherein the junction face (52) of said primary optical member has a shape substantially different from that of the input face of said primary optical member.

4. An optical module (1, 20) according to any one of the preceding claims, comprising: a. a plurality of selectively controllable luminous sources (2), b. the primary optical element (4) comprising a plurality of primary optical elements (5) connected to a single output optical element (6), each primary optical element having a light input face (51) opposite which one of said light sources is disposed and a junction face (52) connecting said primary optical element to the output optical element, the primary optical element being a single piece, and c. the optical projection system (7) arranged to project onto the ground, from the light emitted by each of the light sources and collected by each primary optical element, an image (1a, 1b, 1c) of each of the junction faces of these primary optical elements, each primary optical element being arranged so that the image of its junction face projected onto the ground by the optical projection system is entirely delimited by substantially sharp edges.

5. Optical module (1, 20) according to the previous claim, in which the primary optical elements (5) are arranged one above the other.

6. Optical module (1, 20) according to one of claims 4 or 5, wherein the primary optical elements (5) are connected to the output optical element (6) such that the junction faces (52) with the output optical element of two adjacent primary optical elements are spaced apart from each other.

7. An optical module (1, 20) according to one of claims 4 to 6, wherein at least two primary optical elements (5) join each other upstream of their junction faces (52) so as to be connected together to the output optical element (6) by a single junction face.

8. An optical module (1, 20) according to one of the preceding claims, wherein the output optical element (6) has an output face (62) that is substantially smooth and dome-shaped.

9. An optical module (1, 20) according to one of the preceding claims, wherein the projection optical system (7) has a focal surface (71) passing substantially through the junction face (52) of said primary optical element (5) with the output optical element (6).

10. An optical module (1, 20) according to the preceding claim, wherein the projection optical system (7) comprises at least one lens (7, 73) and / or a reflector (72) and / or a combination of at least one lens and at least one reflector.

11. Luminous system (10) for a motor vehicle, comprising an optical module (1, 20) according to one of the preceding claims, and a control unit for the light sources of said optical module.