LIGHTING MODULE FOR LIGHTING AND / OR SIGNALIZING A MOTOR VEHICLE WITH A TWISTED FIBER OPTIC FOR DISPLAYING A LIGHT PATTERN

Description

Technical field to which the invention relates

[0001] The present invention relates to the technical field of light modules for lighting and / or signaling motor vehicles. The present invention relates more particularly to a light module intended to be mounted in an optical unit for a motor vehicle. Technological background

[0002] Documents DE 10 2013 105261 A1, JP 2015 162363 A and CN 209 856 982 U are representative of the prior art.

[0003] For safety reasons, regulations require that every motor vehicle be equipped with lighting and signalling modules, so as to enable road users to easily identify the position and intentions of motor vehicles.

[0004] As is known, a light module consists of a light source illuminating a suitable optic, to project a light beam in accordance with current regulations.

[0005] Depending on the function of the light module, regulations require that the emitted light beam meets the following specific characteristics: an appropriate color, an appropriate light intensity and a sufficient opening angle.

[0006] The value of the opening angle, imposed by the regulations, is of the order of 120°. In order to respect this value, the use of optical lenses and / or optical reflectors is known to increase the opening angle of the light beam emitted by the light source.

[0007] The use of optical lenses and / or optical reflectors has the disadvantage of significantly increasing the size of the light module. As a result, optical units incorporating several light modules are of large dimensions, which limits the possibilities for arranging optical units on the bodies of motor vehicles. However, the arrangement of an optical unit on a motor vehicle is today an important criterion for differentiating between vehicles.

[0008] Another drawback is that the various parts that make up the light modules significantly increase the weight of the light unit. Reducing the weight of motor vehicles is a constant goal for manufacturers, in order to offer more energy-efficient motor vehicles.

[0009] The present invention aims to solve the technical problems mentioned above, by proposing a light module for lighting and / or signaling a motor vehicle, capable of displaying a light pattern, lighter and less bulky compared to the state of the art, while complying with regulatory obligations. Subject of the invention

[0010] For this, the invention proposes a light module, as defined in claim 1, for lighting and / or signaling a motor vehicle, comprising a first light guide extending between a proximal end and a distal end. The first light guide is delimited by two large faces parallel or substantially parallel to each other. A first light source is arranged opposite the proximal end of the first light guide, so as to allow the propagation of a light beam between the large faces and along a propagation direction parallel or substantially parallel to the large faces. The first light guide comprises diffusing elements capable of deflecting the light propagating in the light guide, towards the large faces.

[0011] The invention is remarkable in that along the propagation direction, the diffusing elements form a light pattern when the first light source illuminates the first light guide, and the large faces of the first light guide are twisted along the propagation direction.

[0012] In other words, the large faces of the light guide rotate on themselves, along the direction of propagation of the light beam emitted by the first light source. In other words, along the direction of propagation of the light beam, the light guide has a shape similar to a helix.

[0013] Advantageously, the original shape of the light guide makes it possible to modify, along the direction of propagation of the light beam, the orientation of a vector normal to a large face of the light guide. This characteristic makes it possible to significantly increase the opening angle of a light beam emitted across the entire surface of a large face of the light guide.

[0014] The presence of diffusing elements in the light guide also makes it possible to increase the value of the opening angle of a beam emitted through a large face of the light guide, so as to comply with regulatory obligations, without resorting to the use of an optical lens or an optical reflector.

[0015] Advantageously, the diffusing elements are arranged in the first light guide so as to form a light pattern when illuminated by the first light source.

[0016] Thus, the invention proposes a light module for lighting and / or signaling a motor vehicle, capable of displaying a light pattern, which is lighter and less bulky compared to the state of the art, while complying with regulatory obligations. Advantageously, the light module according to the invention allows the display of a light pattern visible in a wider angular field of observation, in particular in a field of observation perpendicular or substantially perpendicular to the direction of propagation mentioned above.

[0017] The scattering elements may form simple or complex geometric patterns, such as symbols, letters and / or numbers. Preferably, the scattering elements form one or more patterns, extending along the above-mentioned propagation direction.

[0018] For example, the diffusing elements may be arranged in the first light guide so as to form light patterns, reproducing the appearance of optical fibers diffusing light.

[0019] According to a particular embodiment of the invention, when the first light source illuminates the first light guide, the diffusing elements form at least two light lines. Preferably, the light lines are parallel or substantially parallel to the above-mentioned propagation direction. To allow easy observation of the light lines, preferably, the diffusing elements form lines whose width is between 1 mm and 10 mm, preferably between 2 mm and 5 mm.

[0020] According to a preferred embodiment of the invention, when the first light source illuminates the first light guide, the diffusing elements form at least two light lines spaced apart by a distance of between 2 mm and 20 mm, preferably between 5 mm and 10 mm.

[0021] According to another embodiment of the invention, in a plane normal to the direction of propagation in the light guide of the light beam emitted by the first light source, the proximal end of the light guide extends along a first direction of elongation and the distal end of the light guide extends along a second direction of elongation, and the first direction of elongation forms with the second direction of elongation a twist angle, the value of which is between 10° and 60°, preferably between 40° and 50°. Preferably, along the direction of propagation of the light beam in the light guide, the twisting of the large faces is regular.

[0022] According to another embodiment of the invention, the distance separating the proximal end from the distal end of the first light guide is between 60 mm and 120 mm, preferably between 70 mm and 80 mm.

[0023] According to another embodiment of the invention, the light module comprises a second light source, arranged opposite the distal end of the first light guide, capable of at least partially illuminating the pattern formed by the diffusing elements.

[0024] According to the invention, the light module comprises a second light guide, extending between a proximal end and a distal end, the second light guide being delimited by two large faces parallel or substantially parallel to each other, a third light source being arranged opposite the proximal end of the second light guide, so as to allow the propagation of a light beam between the large faces and along a propagation direction parallel or substantially parallel to the large faces, the second light guide comprising diffusing elements, capable of deflecting the light propagating in the light guide in the direction of the large faces, characterized in that a large front face of the second light guide faces a large rear face of the first light guide. Preferably, the two large faces of the second light guide are parallel or substantially parallel to the large faces of the first light guide.

[0025] According to another embodiment of the invention, the light module comprises a fourth light source, arranged screw-on to the distal end of the second light guide, so as to allow the propagation of a light beam in the second light guide.

[0026] According to the first variant of the invention, the diffusing elements are arranged in the second light guide, so as to form a luminous background which is homogeneous or substantially homogeneous to the first light guide, when the diffusing elements are illuminated by the third light source and / or the fourth light source.

[0027] In other words, the diffusing elements are arranged in the second light guide, so as to allow the diffusion of a visible light background through the first light guide. Thus, advantageously, the second light guide can be used as the first light guide, to emit a light signal for illuminating and / or signaling a motor vehicle.

[0028] According to the second variant of the invention, the light module comprises an optical reflector arranged opposite a large rear face of the second light guide. Preferably, the optical reflector is parallel or substantially parallel to the large rear face of the light guide. The reflector may be light in color and / or its surface may be grained.

[0029] According to another embodiment of the invention, the light sources are capable of emitting a light beam of amber, red or white color.

[0030] According to another embodiment of the invention, the first light guide is capable of emitting a light signal indicating the presence of a motor vehicle to an observer, and the second light guide is capable of emitting a light signal indicating the braking and / or reversing and / or change of direction of a motor vehicle to an observer.

[0031] In other words, the first light guide can be used as a lantern of a motor vehicle, and the second light guide can be used as a reversing light, a brake light and / or a turn signal light, emitting a light beam passing through the first light guide.

[0032] According to another embodiment of the invention, the smallest distance separating two large faces of a light guide is between 2 mm and 5 mm, preferably between 3 mm and 4 mm.

[0033] According to another embodiment of the invention, at least one light source comprises several light-emitting diodes arranged along one end of a light guide. According to a preferred embodiment, at least two light-emitting diodes are capable of emitting light beams of different colors.

[0034] Of course, the various features, variants and embodiments mentioned above may be combined with each other in various combinations, provided that they are not incompatible or mutually exclusive.

[0035] The invention also relates to an optical unit for a motor vehicle, comprising at least one light module as described above.

[0036] Preferably, the light module is arranged in the optical unit so that the direction of propagation in the first light guide, of the light beam emitted by the first light source, is perpendicular or substantially perpendicular to the roadway, when the optical unit is mounted on a motor vehicle, and a large front face of at least one light module is visible from outside the optical unit.

[0037] The optical unit can be mounted at the front or at the rear of a motor vehicle, to illuminate and / or signal the presence of the motor vehicle to other road users.

[0038] According to another embodiment of the invention, the optical unit comprises at least two light modules described above, capable of alternately emitting light through their large front faces.

[0039] Preferably, the optical unit comprises at least two light modules whose light sources are integral with the same plate.

[0040] According to another embodiment of the invention, the optical block comprises at least three light modules, arranged so that their large front faces are clearly visible from outside the optical housing.

[0041] According to another embodiment of the invention, the light module(s) present in the optical unit illuminate a surface visible from the outside of the optical unit, the surface area of which is equal to or greater than 50 cm 2< . Description of the figures

[0042] The invention will be better understood from the following description, which relates to preferred embodiments, given as non-limiting examples, and explained with reference to the appended schematic drawings, in which: [ Fig. 1] illustrates a schematic and perspective view of a first embodiment of a light module not having all the characteristics of the invention; [ Fig. 2 ] illustrates a schematic and perspective view of a second embodiment of a light module according to the invention; [ Fig. 3 ] illustrates a schematic and perspective view of a third embodiment of a light module according to the invention; [ Fig. 4 ] illustrates a schematic and perspective view of a fourth embodiment of a light module according to the invention; [ Fig. 5 ] illustrates a schematic and perspective view of a fifth embodiment of a light module according to the invention; [ Fig. 6 ] illustrates a schematic view of one side of an optical block according to the invention; [ Fig. 7 ] illustrates a schematic view of a cross-section of the optical block represented by the Figure 6, at different heights along the direction of propagation of a light beam in the light guides. Detailed description of the invention

[0043] As a reminder, the invention proposes a light module for lighting and / or signaling a motor vehicle, capable of displaying a light pattern, lighter and less bulky compared to the state of the art, while complying with regulatory obligations.

[0044] There Figure 1 illustrates a first non-limiting embodiment of a light module 2A.

[0045] The light module 2A consists of a light guide 4 illuminated by a first light source 6.

[0046] The light guide 4 extends between a proximal end 8 and a distal end 10. The proximal end 8 of the light guide is delimited by a proximal face 12. The proximal face 12 is parallel or substantially parallel to a distal face 14, delimiting the distal end 10 of the light guide. The distal and proximal faces are spaced apart by a distance of between 60 mm and 120 mm, preferably between 70 mm and 80 mm.

[0047] The proximal and distal faces are connected by two large opposite faces 16, parallel or substantially parallel to each other. The large faces 16 are perpendicular or substantially perpendicular to the proximal face 12. The large faces 16 are spaced apart by a distance of between 2 mm and 5 mm, preferably between 3 mm and 4 mm. The width of the large faces 16, defined in a direction parallel or substantially parallel to the proximal face 12, is between 30 mm and 60 mm, preferably between 40 mm and 45 mm.

[0048] The light guide 4 is made from a material that is transparent or translucent to daylight, preferably from one of the following materials: polycarbonate (PC) or polymethyl methacrylate (PMMA).

[0049] The first light source 6 is arranged so as to illuminate the proximal face 12 of the light guide, in order to allow the propagation of a light beam between the large faces 16, along a propagation direction 18 parallel or substantially parallel to the large faces 16.

[0050] According to the present example, the first light source 6 comprises three separate light-emitting diodes 20, arranged along the proximal face 12 of the first light guide. The light beams emitted by the light-emitting diodes 20 propagate in the first light guide 4 parallel or substantially parallel to the propagation direction 18.

[0051] The light-emitting diodes 20 are capable of emitting light beams of identical colors or of different colors, in particular light beams of white, amber or red color, so that the light module 2A can respectively be used as a reversing light, indicator light or position and / or brake light.

[0052] The light-emitting diodes 20 are electrically powered by a control unit, not shown in the Figure 1 , capable of operating each light-emitting diode 20 autonomously. The control unit is in particular programmed to operate the light-emitting diodes simultaneously or alternatively in order to create dynamic visual effects.

[0053] The first light guide 4 includes diffusing elements, making it possible to deflect at least part of a light beam propagating in the first light guide 4, towards its large faces 16.

[0054] By way of non-limiting example, the diffusing elements are located at a large rear face 22 of the first light guide and form lines 23 parallel or substantially parallel to the propagation direction 18. The diffusing elements are configured so that a portion of the light beam emitted by the first light source 6 passes through a large front face 24 of the first light guide 4. The opening angle of the light beam emitted through the large front face 24 of the light guide is between 15° and 40°, preferably of the order of 30°.

[0055] According to an alternative embodiment not shown, the diffusing elements are arranged so as to form a line in front of each light-emitting diode 20, so that each line can be illuminated by a light-emitting diode independently of the other lines. This embodiment is particularly advantageous for creating a "sweep" type animation effect.

[0056] According to the present example, the diffusing elements consist of conical cavities, open on the large rear face 22 of the first light guide 4. The tops of the cavities are oriented towards the large front face 24. The internal volume of each cavity is between 48,000 µm 3< and 536,000 µm 3< , preferably of the order of 95,000 µm 3< and 268,000 µm 3< , preferably of the order of 218,000 µm 3< . The cavities are spaced apart, at the large rear face 22, by a distance of between 0.12 mm and 0.7 mm, preferably between 0.13 mm and 0.5 mm.

[0057] As mentioned above, the diffusing elements form lines 23 visible on the Figure 1 , the width of which is between 1 mm and 10 mm, preferably between 2 mm and 5 mm. Preferably, two lines 23 are spaced apart by a distance of between 2 mm and 20 mm, preferably between 5 mm and 10 mm.

[0058] As illustrated by the Figure 1 , the large faces 16 of the first light guide 4 are twisted, along the propagation direction 18. In other words, the large faces 16 perform a rotating movement on themselves, along the propagation direction 18.

[0059] This rotating movement advantageously makes it possible to modify the orientation of the large front face 24 of the first light guide 4. On the Figure 1 , the orientation of the large front face 24 is represented by a normal vector 26 to said large face. We thus observe on the Figure 1that the orientation of the normal vector 26 changes along the propagation direction 18.

[0060] As a result, the orientation of the light beam emitted through the large front face 24 of the first light guide 4 pivots along the propagation direction 18, so that the light lines 23 are visible more widely in a plane normal to the propagation direction 18. By the term "more widely" is meant the fact that the light lines are visible according to a wider viewing angle, in a plane perpendicular or substantially perpendicular to the propagation direction 18.

[0061] In other words, the light guide 4 is capable of pivoting the light beam emitted by the light module 2A, along the propagation direction 18, so as to increase the diffusion angle of the light emitted by the lines 23 along the light guide.

[0062] The visibility of the 23 light lines is thus increased, without resorting to the use of a bulky and fragile mechanical system.

[0063] Preferably, the rotating movement of the large faces 16 is regular along the propagation direction 18, so that the first light guide 4 is a shape similar to a helix.

[0064] In a plane normal to the propagation direction 18, the proximal face 12 of the first light guide extends along a first elongation direction 28, and the distal face 14 of the first light guide extends along a second elongation direction 30. Preferably, the first elongation direction 28 forms with the second elongation direction 30, a twist angle whose value is between 10° and 60°, preferably between 40° and 50°.

[0065] The diffusing elements and the twist angle of the large faces 16 thus allow the light module 2A to emit a light signal through the large front face 24 of the first light guide 4, illuminating between 80° and 130°, preferably between 110° and 130°, of a landscape included in a plane normal to the propagation direction 18. Thus, the invention proposes a light module 2A that is simpler in design, less bulky and lighter compared to the state of the art, to emit a more widely visible light pattern.

[0066] A second variant embodiment of a light module 2B, which is according to the invention, is illustrated by the Figure 2 . The elements that are identical or similar between the different variant embodiments of the invention described below are designated by the same references in the attached figures.

[0067] The light module 2B differs from the light module 2A described above, in that it comprises a second light source 32 illuminating the distal face 14 of the first light guide 4. According to the present example, the second light source 32 is identical or similar to the first light source 6, it is composed of three light-emitting diodes 20 positioned along the distal face 14 of the first light guide 4. This embodiment advantageously makes it possible to illuminate the large front face 24 of the first light guide more uniformly.

[0068] According to a preferred embodiment, the first light source 6 and the second light source 32 emit light beams of different colors. By way of non-limiting example, the first light source 6 can emit a red or amber colored light beam, and the second light source 32 can emit a white colored light beam.

[0069] There Figure 3presents a third variant of a light module 2C according to the invention. The light module 2C differs from the light module 2B described above, in that it comprises a second light guide 4A extending between a proximal end 8A and a distal end 10A. The second light guide 4A is delimited by two large faces parallel or substantially parallel to each other. A third light source 6A is arranged opposite the proximal end 8A of the second light guide 4A, so as to allow the propagation of a light beam between the large faces, along a propagation direction 18 parallel or substantially parallel to the large faces. The second light guide 4A comprises diffusing elements not visible in the figures, capable of deflecting the light propagating in the light guide 4A, towards its large faces.The second light guide 4A is arranged opposite the first light guide 4, such that a large front face 24A of the second light guide 4A faces a large rear face of the first light guide 4.

[0070] The large faces of the first light guide and the large faces of the second light guide are parallel or substantially parallel to each other. Preferably, the large front face 24A of the second light guide 4A and the large rear face of the first light guide 4 are spaced apart so as not to modify the diffusion properties of the diffusing elements present on the large rear face of the first light guide 4. According to the present example, the first light guide 4 is spaced apart from the second light guide 4A by a distance of between 0.5 mm and 30 mm, preferably between 10 mm and 20 mm.

[0071] The third light source 6A is configured to illuminate all of the diffusing elements present at the large rear face of the second light guide 4A. The diffusing elements are configured and arranged to form a luminous background at the large front face 24A of the second light guide. In other words, the third light source is capable of illuminating in a homogeneous or substantially homogeneous manner the large front face 24A of the second light guide, opposite the large rear face of the first light guide 4.

[0072] Preferably, the diffusing elements are formed from cavities identical or similar to the cavities described above.

[0073] According to the present example, the distal end 10A of the second light guide 4A is illuminated by a fourth light source 32A identical or similar to the first light source 6.

[0074] There Figure 4illustrates another embodiment of a 2D light module according to the invention. The 2D light module differs from the 2C light module described above, in that it comprises an optical reflector 34, arranged opposite the large rear face of the second light guide 4A. The optical reflector 34 is parallel or substantially parallel to the large rear face of the second light guide 4A. The optical reflector 34 is preferably light in color and its surface is grained. The optical reflector 34 is positioned at a distance from the large rear face of the second light guide 4A, so as not to modify the diffusion properties of the diffusing elements. According to the present example, the smallest distance between the optical reflector 34 and the large rear face 22 of the light guide 4 is between 0.5 mm and 1 mm.

[0075] There Figure 5presents a fifth variant of a 2E light module according to the invention. The 2E light module differs from the 2D light module described above, in that it comprises three 2D light modules arranged side by side. The proximal ends 8 of the 2D light modules are parallel or substantially parallel to each other. The first light sources 6 are mounted on the same first plate 36. The second light sources 32 are mounted on the same second plate 38. The second plate 38 is parallel or substantially parallel to the first plate 36. Preferably, the plates serve as a support for holding and electrically connecting a set of electronic components together, with the aim of producing a complex electronic circuit. By way of non-limiting example, a plate can serve as a support for the control unit of the light sources which illuminate the light guides.

[0076] The large front faces of the first light guides 4 are arranged side by side, so that when the first three light guides 4 are illuminated simultaneously, the light module 2E illuminates a continuous or substantially continuous surface for an observer of the light module, the total surface area of which at the level of the large front faces is greater than 40 cm 2< , preferably equal to or greater than 50 cm 2< .

[0077] According to an alternative embodiment, the light sources are controlled by a control unit not shown in the Figure 5 , allowing each light guide to be illuminated with a different color, simultaneously or alternately, in order to create a light animation.

[0078] Preferably, the first and second light sources are configured to emit a red or amber color, and the third and fourth light sources are configured to emit a white and / or red color.

[0079] According to a variant embodiment not illustrated, the light module may comprise at least two light guides whose torsion angles are of different values.

[0080] According to a variant embodiment not illustrated, the light module may comprise at least two light guides of different lengths.

[0081] According to a variant embodiment not illustrated, the light module may comprise at least two light guides whose large front faces are oriented differently.

[0082] There Figure 6shows a side view of an optical unit 40 for a motor vehicle. According to the present example, the optical unit is intended to be mounted at the front of a motor vehicle. The optical unit 40 consists of an optical housing 42 delimited by a lower face 44. The lower face is intended to be parallel or substantially parallel to the roadway, when the optical unit 40 is mounted on a motor vehicle. The optical unit 40 has an opening closed by a glass 46, protecting the elements present in the optical housing 40 from the external environment, while allowing their observation from outside the optical unit.

[0083] According to the invention, the optical housing 42 comprises a light module 2E as described above and shown in the Figure 5. The light module 2E is arranged in the optical housing so that the large front faces 24 of the first light guides are oriented towards the glass 46, so as to be visible through the glass. More precisely, the first light guides 4 are positioned in the optical housing 42 so that the directions of propagation 18 in the light guides, of the light beams emitted by the first light sources, are perpendicular or substantially perpendicular to the lower face 44 of the optical housing 42.

[0084] Cross sections of the optical block 40, at different heights, are illustrated in the Figures 7A to 7C The height of the light guides is defined in a direction parallel to the direction of propagation 18 of the light beams, emitted by the first light sources, in the light guides.

[0085] More specifically, the Figures 7A to 7Crespectively represent a cross-section of the optical unit 40 at the height of the proximal end 8 of the light guides, a cross-section of the optical unit 40 at mid-height of the light guides and a cross-section of the optical unit 40 at the height of the distal end 10 of the light guides. Reference 48 symbolizes the longitudinal axis of a motor vehicle, passing through the front and the rear of the motor vehicle, equipped with the optical unit 40.

[0086] As illustrated by the Figure 7A , the 2D light module is positioned in the optical block so that the large front faces 24 of the first light guides are oriented towards the center of the roadway, forming with the straight line 48 an angle whose value is of the order of 22°5.

[0087] As illustrated by the Figure 7B, at mid-height, the large front faces 24 of the light guides are perpendicular to the line 48. In other words, at mid-height, the large front faces 24 of the first light guides face the road.

[0088] As illustrated by the Figure 7C , at their distal ends 10, the first light guides are oriented so that their large front faces form an angle of - 22°5 with the straight line 48. In other words, the distal ends of the first light guides 4 are oriented towards an edge of the road.

[0089] The optical block 40 illustrated by the Figures 6 to 7C is thus able to emit one or more light patterns, in the form of illuminated lines for example, of identical or different colors.

[0090] Advantageously, the diffusing elements are arranged in the second light guide, so as to allow the diffusion of a visible light background through the first light guide. Thus, the second light guide can be used like the first light guide, to emit a light signal for illuminating and / or signaling a motor vehicle, in accordance with the regulations in force, without resorting to the use of an optical lens or a bulky optical reflector.

[0091] As a result, the optical housing 42 is less expensive to produce and less heavy compared to the state of the art.

[0092] According to another advantage, the dimensions of the optical unit can be reduced in order to facilitate its integration into a motor vehicle, taking into account the small size of the light module. An optical unit according to the invention is thus more compact compared to the state of the art.

Claims

1. Light module (2A, 2B, 2C, 2D, 2E) for lighting and / or signaling for a motor vehicle, comprising: - a first light guide (4) extending between a proximal end (8) and a distal end (10), the first light guide (4) being delimited by two big faces which are parallel or essentially parallel to each other, a first light source (6) being arranged in front of the proximal end (8) of the first light guide (4), so as to allow the propagation of a light beam between both big faces and in a direction of propagation (18) parallel or essentially parallel to the big faces (16), the first light guide (4) comprising scattering elements suitable for deviating the light that propagates inside the light guide (4) towards the big faces (16) along the direction of propagation (18), the big faces (16) of the light guide (4) being twisted along the direction of propagation (18), and - a second light guide (4A) extending between a proximal end (8A) and a distal end (10A), the second light guide (4A) being delimited by two big faces which are parallel or essentially parallel to each other, a third light source (6A) being arranged in front of the proximal end (8A) of the second light guide (4A), so as to allow the propagation of a light beam between both big faces and in a direction of propagation (18) parallel or essentially parallel to the big faces (16), the second light guide (4A) comprising scattering elements suitable for deviating the light that propagates inside the second light guide (4A) towards the big faces, a big front face (24A) of the second light guide (4A) facing a big rear face of the first light guide (4), characterized in that: i) the scattering elements form a light pattern (23) when the first light source (6) lights the first light guide (4), and in that: ii) the scattering elements of the second light guide are arranged in the second light guide (4A) so as to form, when they are lighted, a homogeneous or essentially homogeneous shimmering background for the first light guide (4); and / or iii) the light module comprises an optical reflector (34) arranged in front of a big rear face of the second light guide (4A).

2. Light module (2A, 2B, 2C, 2D, 2E) according to claim 1, characterized in that, when the first light source (6) lights the first light guide (4), the scattering elements form at least two light lines (23).

3. Light module (2A, 2B, 2C, 2D, 2E) according to claim 1 or 2, characterized in that, when the first light source (6) lights the first light guide (4), the scattering elements form at least two light lines (23) being spaced at a distance of between 2 mm and 20 mm, preferably between 5 mm and 10 mm.

4. Light module (2A, 2B, 2C, 2D, 2E) according to one of claims 1 to 3, characterized in that, in a plane perpendicular to the direction of propagation (18), the proximal end (8) extends along a first direction of extension (28) and the distal end (10) extends along a second direction of extension (30), and in that the first direction of extension (28) and the second direction of extension (30) form a twisting angle, the value of which is between 10° and 60°, preferably between 40° and 50°.

5. Light module (2A, 2B, 2C, 2D, 2E) according to one of claims 1 to 4, characterized in that the distance between the proximal end (8) and the distal end (10) of the first light guide (4) is between 60 mm and 120 mm, preferably between 70 mm and 80 mm.

6. Light module (2B, 2C, 2D) according to one of claims 1 to 5, characterized in that it comprises a second light source (32) arranged in front of the distal end (10) of the first light guide (4), suitable for lighting, at least partially, the pattern (23) formed by the scattering elements.

7. Light module (2C, 2D, 2E) according to one of claims 1 to 6, characterized in that both big faces of the second light guide (4A) are parallel or essentially parallel to the big faces of the first light guide (4).

8. Light module (2A, 2B, 2C, 2D, 2E) according to claim 1, characterized in that it comprises a fourth light source (32A) arranged in front of the distal end (10A) of the second light guide (4A), so as to allow the propagation of a light beam in the second light guide (4A).

9. Light module according to one of the claims 1 too 8, characterized in that the light sources are suitable for emitting a light beam having a yellow, red, or white color.

10. Light module according to claim 9, characterized in that the first light guide (4) is suitable for emitting a light signal indicating the presence of the motor vehicle to an observer, and in that the second light guide (4A) is suitable for emitting a light signal indicating breaking and / or rolling backwards and / or changing the direction of a motor vehicle to an observer.

11. Optical block (40) for a motor vehicle, characterized in that it comprises at least one light module (2A, 2B, 2C, 2D, 2E) according to one of claims 1 to 10.

12. Optical block (40) according to claim 11, characterized in that the light module (2A, 2B, 2C, 2D, 2E) is arranged in the optical block (40) so that the direction of propagation (18) of the light beam emitted by the first light source (6) inside the first light guide (4) is perpendicular or essentially perpendicular to the road when the optical block (40) is mounted on the motor vehicle, and in that a front big face (24) of at least one light module (2A, 2B, 2C, 2D, 2E) is visible from the outside of the optical block (40).