Light module imaging the illuminated surface of a collector with blocking of interfering rays

Abstract

The invention relates to a light module (102) comprising a light source (104) capable of emitting light rays; a collector (106) with a reflective surface (102.6); an optical system (110) configured to project a light beam by imaging a portion of the reflective surface (102.6) located at the rear of the light source (104); a screen (112) located at the front of the light source (104), with a rear face (112.1) capable of collecting light rays (114) emitted forwards by the light source (104) and not reflected by the reflective surface (102.6); wherein the screen (112) comprises an end face (112.2), adjacent to the rear face (112.1) and opposite the reflected light rays (116), configured to avoid and / or absorb said reflected light rays.

Description

technical field

[0001] The invention relates to the technical field of lighting and signaling, more particularly for applications in the automotive field. Previous technique

[0002] It is generally known to create a cutoff beam using one or more bending light modules. Such a light module typically comprises a collector with a reflective surface of revolution having an elliptical profile, shaped like a cap within a half-space delimited by a horizontal plane. An essentially point light source, such as a light-emitting diode (LED), is located at a first focus of the reflective surface and illuminates the half-space in the direction of said surface. The rays are thus reflected convergently towards a second focus of the reflective surface. Another reflective surface, usually flat, with a cutoff edge at the second focus, ensures upward reflection of the rays that do not pass precisely through the second focus. These rays are then refracted downwards by a thick lens into the lighting beam.This reflective surface is commonly referred to as a "bender" because it bends the rays upwards towards the projection lens, preventing them from forming the upper part of the light beam. Such a light module has the disadvantage of requiring significant precision in the positioning of the bender and the cut edge. Furthermore, the projection lens must be thick due to its short focal length, which increases its weight and complicates its production, particularly due to the risk of sink marks. In addition, the collector has a certain height and, consequently, a certain amount of vertical space.

[0003] The published patent document WO 2020 / 025171 A1 discloses a light module, particularly for motor vehicles, comprising a collector with a reflective surface that gathers and reflects light rays emitted by a light source into a light beam, similar to a folding light module. The light module also includes a projection optical system, such as a lens, specifically configured to project the light beam, forming an image of the collector's reflective surface. To this end, the projection optical system has a focal point located on the reflective surface, for example, at its rear edge, so as to properly image said edge and form a sharp cut in the projected light beam. Some rays emitted by the light source and not reflected by the collector's reflective surface may, however, reach the projection optical system and degrade the projected light beam.To this end, a screen is placed in front of the light source. However, this screen presents certain difficulties, particularly regarding its impact on the rays reflected by the reflective surface and upon encountering it, which can degrade the photometry of the desired beam and, in particular, create stray rays within the beam. Description of the invention

[0004] The invention aims to overcome at least one of the drawbacks of the aforementioned prior art.

[0005] The invention relates to a light module comprising a light source capable of emitting light rays; a collector with a reflective surface configured to collect and reflect a portion of the light rays, called reflected rays, into a light beam reflected along an optical axis of the light module; an optical system configured to project at least the majority of the reflected light beam into a projected light beam by imaging a portion of the reflective surface located, along a general direction of propagation of the reflected light beam along the optical axis, at the rear of the light source; a screen located at the front of the light source, along the general direction of propagation of the light beam along the optical axis, with a rear face arranged to collect direct light rays emitted forwards by the light source and not reflected by the reflective surface;remarkable in that the screen comprises an end face at a free end of said screen, opposite the reflected light rays, arranged so as to be away from said reflected light rays and / or to absorb a part of said reflected light rays.

[0006] Thus, the invention optimizes the function of the blocking screen against rays emitted directly by the light source—that is, rays not reflected by the reflective surface of the collector—which could otherwise reach the optical projection system and degrade the projected light beam, particularly at the cutoff point in the case of a cutoff beam. Indeed, this blocking of direct rays, notably through absorption or appropriate deflection, is achieved while avoiding any detrimental interference with the projected light beam.

[0007] Advantageously, the end face is adjacent to the back face.

[0008] Advantageously, the projected light beam can have a cutoff line, preferably horizontal. The invention is particularly advantageous for such a beam, as dazzling stray rays are reduced or even eliminated.

[0009] The collector may have a rear edge whose profile, projected by the optical system, forms the cut-off line. This eliminates the need for a cover, particularly a bending machine, to create the cut-off line.

[0010] Advantageously, the optical system can have a focal area located on the reflective surface of the collector, particularly behind the light source. This simply allows imaging of the portion of the reflective surface located behind the light source.

[0011] More advantageously, the focal area can be located at a rear edge of said reflective surface.

[0012] Generally speaking, this focal area can be a focal point, also called a focus, or it can be a focal line, also called a line of foci.

[0013] The optical system may include a lens, or one or more mirrors, whose focal area is that of the optical system.

[0014] The following are described advantageous but not limiting modes of the invention, one or more of these modes being able to be combined with each other.

[0015] The collector can be a concave reflector.

[0016] At least some of these reflected rays have angles of inclination with respect to the optical axis that are less than or equal to 10°. This allows us to be in the so-called Gaussian conditions, thus enabling stigmatism.

[0017] According to an advantageous embodiment of the invention, the end face of the screen may have a length, along the general direction of propagation of the light beam along the optical axis, less than or equal to 1mm, making it possible to avoid reflected light rays.

[0018] According to an advantageous embodiment of the invention, the end face of the screen can be inclined with respect to the nearest reflected light rays, so as to be away from said reflected light rays. This is a simple way of implementing the screen while minimizing its interference with the reflected rays.

[0019] Advantageously, the reflected rays may have an inclination with respect to the optical axis, and the inclination of the end face of the screen with respect to the optical axis may be greater than the inclination of the reflected light rays closest to said end face, or even directly adjacent to this end face, so as to be away from said reflected light rays.

[0020] The end face can be an inclined surface oriented towards the optical system. In particular, it can join the rear face at an acute angle to form an edge. This further minimizes the risk of interference with the reflected beam.

[0021] Specifically, this edge can be arranged so that, at its level, the lowest rays of the reflected beam pass very close to the edge, while the other reflected rays pass over it. This optimizes the blocking effect by interfering as little as possible, or even not at all, with the reflected light beam. The projected beam is thus optimized.

[0022] According to an advantageous embodiment of the invention, the optical system has a focal area located on the reflective surface of the collector, at the rear of the light source.

[0023] According to an advantageous embodiment of the invention, the end face of the screen can have a reflectance in the visible light spectrum of less than 0.3. This characteristic can be applied to the end face in particular when said end face is not inclined.

[0024] According to an advantageous embodiment of the invention, the screen is opposite the reflective surface.

[0025] According to an advantageous embodiment of the invention, the screen extends transversely to the optical axis from a plate supporting the light source. For example, the screen may be a separate part of the plate. Alternatively, the screen may be an integral part of the plate.

[0026] According to an advantageous embodiment of the invention, the screen is an outgrowth of a cooling radiator for the light source, said radiator being located on a face of the plate opposite the light source.

[0027] According to an advantageous embodiment of the invention, the screen is a first screen located on the same side of the optical axis as the light source, said light module comprising a second screen located on the opposite side of the optical axis and in front of the reflective surface, and comprising a rear face configured to collect direct light rays emitted forwards by the light source, not reflected by the reflective surface and passing beside the end face of the first screen and between said end face and the reflective surface.

[0028] According to an advantageous embodiment of the invention, the second screen comprises an end face at one free end of said second screen and opposite the reflected light rays, arranged so as to be away from the reflected light rays, absorb and / or reflect said reflected light rays towards a lower half of the reflected light beam. Advantageously, the end face of the second screen is adjacent to the rear face of said second screen.

[0029] According to an advantageous embodiment of the invention, the end face of the second screen has an inclination with respect to the nearest reflected light rays, so as to be away from said reflected light rays.

[0030] Advantageously, the reflected rays have an inclination with respect to the optical axis, and the inclination of the end face of the second screen with respect to the optical axis is greater than the inclination of the reflected light rays directly adjacent to said end face, so as to be away from said reflected light rays.

[0031] According to an advantageous embodiment of the invention, the end face of the second screen has a reflectance in the visible light spectrum of less than 0.3. This characteristic can be applied to the end face of the second screen in particular when said end face is not inclined.

[0032] According to one embodiment of the invention, the end face of the second screen has a reflectance in the visible light spectrum substantially equal to 0.9. Here, by "substantially equal" means equality to within + / - 10%.

[0033] According to an advantageous embodiment of the invention, the end face of the second screen has a convex curvature suitable for reflecting the reflected light rays towards the lower half of the light beam.

[0034] According to an advantageous embodiment of the invention, the second screen is located in front of the reflective surface of the collector.

[0035] According to an advantageous embodiment of the invention, the second screen is supported by the collector. For example, the second screen can be formed integrally with the collector.

[0036] The invention also relates to a motor vehicle projector, comprising a light module according to the invention.

[0037] The measures of the invention are advantageous in that they allow the projected light beam to be prevented from being disturbed by stray light rays, and this in an efficient and simple manner. In particular, the provision of a screen with an end face specially sized and / or configured to prevent the unwanted reflection of rays from the reflective surface back into the projected light beam.

[0038] Also, providing a second screen on the opposite side to the first screen relative to the optical axis of the light module allows control of the portion of the rays emitted forward by the light source and not reflected by the reflective surface. Brief description of the drawings

[0039] [ Fig 1 ] is a schematic, side-view representation of a light module according to a first embodiment of the invention; [ Fig 2 ] is a perspective view of the light module collector of the figure 1 ; Fig 3 ] is a view of the inner surface of the light module collector of the figure 1 , from the outside along the optical axis; [ Fig 4 ] is a graphical representation of the luminous image of the lighting beam produced by the luminous module of the figure 1 ; Fig 5 ] is a schematic, side-view representation of a light module according to a second embodiment of the invention; [ Fig 6 ] is a schematic, side-view representation of a variant of the light module of the second embodiment of the invention of the figure 5 ; Fig 7 ] is a schematic, side-view representation of a light module according to a third embodiment of the invention; [ Fig 8 ] corresponds to the figure 7 of the third embodiment of the invention, illustrating the inclination of the end faces of the screens; [ Fig 9] is a schematic, side-view representation of a light module according to a fourth embodiment of the invention; [ Fig 10 ] is a schematic, side-view representation of a light module according to a fifth embodiment of the invention; [ Fig 11 ] is a schematic representation, viewed from above, of a light module according to the fifth embodiment of the invention, while also being applicable to each of the different embodiments of the invention; [ Fig 12 ] is a perspective representation of a screen with an inclined end face, fully formed with a cooling radiator; [ Fig 13 ] is a perspective representation of the realization of a screen with a more inclined end face and fully formed with a cooling radiator. Detailed description

[0040] THE figures 1 to 4illustrate a first embodiment of a light module according to the invention.

[0041] There figure 1 This is a schematic, side-view representation of the light module and its operating principle. The light module 2 essentially comprises a light source 4, a collector 6 capable of reflecting the light rays emitted by the light source 4 to form a light beam along an optical axis 8 of the light module, and a projection lens 10 for this beam. The optical axis 8 of the light module coincides with the optical axis of the projection lens 10. Other optical projection systems besides the projection lens are possible, such as one or more mirrors.

[0042] Here, as generally according to the invention, the light source 4 is advantageously of the semiconductor type, such as, in particular, a light-emitting diode. Specifically, the light source 4 emits light rays into a half-space delimited by the principal plane of said source, in a principal direction perpendicular to said plane and to the optical axis 8.

[0043] The collector 6 comprises a main body 6.1 in the shape of a shell or dome, and a reflective surface 6.2 on the inner face of the main body 6.1. The reflective surface 6.2 may advantageously have an elliptical or parabolic profile. It is advantageously a surface of revolution about an axis parallel to the optical axis. Alternatively, it may be a freeform surface. It may also have several sectors. The shell- or dome-shaped collector 6 is advantageously made of materials with good heat resistance, for example, glass or synthetic polymers such as polycarbonate (PC) or polyetherimide (PEI).

[0044] The term "parabolic" generally applies to reflectors whose surface has a single focal point, that is, a zone of convergence for light rays such that light rays emitted by a light source placed at this convergence zone are projected over a great distance after reflection from the surface. Projected over a great distance means that these light rays do not converge towards a zone 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 do 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 or may not have parabolic sections. A reflector with such a surface can, in particular, be used alone to create a beam of light.

[0045] The light source 4 is positioned at a focus of the reflecting surface 6.2 such that its rays are collected and reflected into a beam of light along the optical axis. At least some of these reflected rays have angles of inclination α with respect to said optical axis that are less than or equal to 10°, thus meeting Gaussian conditions, which allow for stigmatism, i.e., a sharp projected image. Advantageously, these are the rays reflected by the rear part of the reflecting surface 6.2.

[0046] The projection lens 10 is advantageously a plano-convex lens, that is, with a flat entrance face 10.1 and a convex exit face 10.2. The lens 10 is said to be thin, for example less than 6 mm, due to the shallow angle of the rays to be deflected. The lens 10 has a focal point 10.3 located along the optical axis 8, at the level of the light source 4 or behind said source. In this case, the focal point 10.3 is located on the reflective surface 6.2 of the collector 6, more precisely at its rear edge, here also referred to as its lower edge.

[0047] The reflecting surface, if it is of the elliptical type, has a second focus 6.3 located in front of the lens 10 and at a distance from the optical axis 8. It should be noted that it is also possible that this focus is located behind the lens and / or on the optical axis, preferably close to the lens, so as to reduce the width of the beam at the level of the entrance face of the lens.

[0048] The light module 2 includes a screen 12 positioned in front of the light source 4 and opposite the reflective surface 6.2 of the collector 6, with a rear face 12.1 adapted to collect the direct light rays 14 emitted forwards directly by the source 4, i.e., rays not intersecting the reflective surface 6.2. This measure is useful for preventing the presence of stray light rays that could contribute to the formation of the light beam without actually being imaged. These direct rays 14, particularly those parallel or nearly parallel to the optical axis 8, would then potentially illuminate an upper part of the light beam, which is undesirable in the case of a cutoff beam.

[0049] The rear face 12.1 of the screen 12 is advantageously opaque in order to absorb the direct rays 14, emitted forward directly by the light source 4, it being understood that it is also conceivable that it may be reflective in order to reflect these rays towards an absorption area.

[0050] The screen 12 extends along a main transverse direction, advantageously perpendicular to the optical axis 8. It has an end face 12.2 opposite the rays 16 reflected by the reflective surface 6.2. The end face 12.2 is adjacent to the rear face 12.1. One can observe at the figure 1Among the rays 16 reflected by the reflective surface 6.2, the closest rays directly adjacent to the end face 12.2 are only very slightly disturbed by said surface due to its small width along the direction of the optical axis 8. The reflected rays 16 incident on this end face 12.2 are absorbed, reflected, or a combination of both, depending on the optical reflectance properties of said face. The luminous flux associated with these rays is reduced so that the portion of these reflected rays is negligible. For this purpose, the width of the end face 12.2 is advantageously less than or equal to 1 mm.

[0051] In practice such a thin screen 12, in the form of a blade, can be made from a portion of sheet metal, the thickness of which forms the width of the screen 12.

[0052] There figure 2 is a rear, perspective view of collector 6 of light module 2 of the figure 1The shell-like or cap-like shape of the main body 6.1 can be observed, as well as the fact that the reflective surface (not visible) has a front edge 6.2.1 and a rear edge 6.2.2. Given that the main body 6.1, and consequently the reflective surface 6.2, form a shell, notably one that is globally symmetrical in revolution, this shell is delimited by a plane. This plane includes a portion of the rear edge 6.2.2, which extends laterally on either side of the axis of revolution. When the reflective surface 6.2 is illuminated by the light source, it is illuminated across its entire surface, which is delimited by the front edge 6.2.1 and the rear edge 6.2.2.

[0053] There figure 3Figure 6.2 represents the light intensity at the reflective surface 6.2 as seen from the outside, along the optical axis. More specifically, it represents the surface illuminance, namely the power of the electromagnetic radiation striking per unit area perpendicular to its direction, expressed in W / m². Zone 6.2.3, covering the majority of the surface, corresponds to lower illuminance levels, while the central zone 6.2.4 corresponds to higher illuminance levels. It can be observed that zone 6.2.3 is clearly delimited by edges 6.2.1 and 6.2.2. In other words, the illuminated surface 6.2 naturally has sharp edges capable of creating breaks in the projected light beam illuminating this surface.

[0054] There figure 4 is a graphical representation of the image projected by the light module of the figure 1, in particular on a vertical screen located 25 meters from the light module. The horizontal and vertical axes intersect at the optical axis of the light module. The curves are isolux, that is, they correspond to areas of the light beam that have the same illuminance expressed in lux. The curves in the center correspond to a higher illuminance level than at the periphery. It can be observed that the light beam produced has a horizontal cutoff, essentially at the horizontal axis, slightly below it, specifically by 1 degree. The cutoff is approximately straight. In any case, the horizontal cutoff is made by the edge 6.2.2 ( figure 3 ) which is the rear edge ( figure 2 ) of the reflective surface 6.2 of the collector 6.

[0055] There figure 5is a schematic, side-view representation of a light module according to a second embodiment of the invention. The reference numbers of the first embodiment of the light module ( figures 1 to 4 ) are used to designate the same or corresponding elements, these numbers being increased by 100. Reference is also made to the description of these elements in relation to the figures 1 to 4 .

[0056] The second embodiment is similar to the first embodiment and differs essentially in that the screen 112 is solid, that is to say, it does not form a thin sheet like the screen 12. figure 1Given the mass of the screen 112, the end face 112.2 has a length along the direction of the optical axis 108 sufficient to disrupt, by reflection of reflected rays 116 onto said end face 112.2, the reflected light beam, and thus the projected light beam. For this reason, the end face 112.2 is inclined towards the optical system relative to the optical axis 108 more than directly adjacent reflected rays 116, so as to avoid these rays. In this way, only the rear face 112.1 of the screen 112 collects the direct rays 114, emitted forwards directly by the light source 104.

[0057] As can be seen, the light source 104 is arranged on a plate 118 which can also support the screen 112. This measure is applicable to other embodiments, in particular the first embodiment.

[0058] As is also visible in the figure 5The projection lens 110 is of the biconvex type, meaning that each of the entrance face 110.1 and exit face 110.2 is convex. It is understood that the plano-convex lens of the first embodiment is applicable to this second embodiment and vice versa.

[0059] There figure 6 represents a variant of the second embodiment to the figure 5 According to this variant, the screen 112' is entirely formed with a radiator 120 for cooling the light source 104. The latter is arranged under the plate 118', that is to say on one of the two main faces of said plate 118', opposite to the other of said two faces, supporting the light source 104. In this case, the plate 118' has an opening through which the screen 112' extends, it being understood however that it is also possible that the screen 112' extends to the front of the plate 118'.

[0060] Generally, according to the invention, as shown here, the 118' plate can be a printed circuit board carrying the light source. Alternatively, the light source can be mounted directly on the heat sink and connected to the printed circuit board via traces, in particular wire bonding.

[0061] There figure 7 is a schematic, side-view representation of a light module according to a third embodiment of the invention. The reference numbers of the second embodiment of the light module ( figure 5 ) are used to designate the same or corresponding elements, these numbers being increased by 100. Reference is also made to the description of these elements in the second embodiment.

[0062] The light module 202 according to this third embodiment includes a second screen 222, separate from the first screen 212 and located on one side of the optical axis 208 opposite to that where the first screen 212 is located. The second screen 222 is configured to block the light rays 214.2 emitted forwards by the light source, not reflected by the reflective surface and passing through the first screen 212. For this purpose, the second screen 222 includes a rear face 222.1 collecting these rays 214.2. Similar to the first screen 212, the second screen 222 extends along a main transverse direction, advantageously perpendicular to the optical axis 208. It includes an end face 222.2 opposite the rays 216 reflected by the reflective surface 206.2 of the collector 206. This end face 222.2 is directly adjacent to the rear face 222.1.It is inclined relative to the optical axis 208 more than the nearest reflected rays 216, that is, those directly adjacent to the face in question, so as to avoid these rays. In other words, these rays pass in front of the edge formed by the intersection of the rear face 222.1 with the end face 222.2, without encountering said end face 222.2. These rays are thus not deflected. Only the direct rays 214.2, emitted forward directly from the light source, encountering the rear face 222.1 of the second screen are blocked by absorption, reflection, or a combination of both.

[0063] There figure 8 essentially corresponds to the figure 7 namely a schematic representation, in side view, of a light module according to the third embodiment of the invention, illustrating the inclinations of the end faces of the first and second screens 212 and 222.

[0064] It can be observed that the rays 216 reflected by the reflective surface 206.2 of the collector 306 have angles of inclination α1 and α2 with respect to the optical axis 208, angle α1 concerning the rays passing below the optical axis 208 and angle α2 concerning the rays passing above the optical axis 208. The end face 212.2 of the first screen 212, located below the optical axis 208, is inclined at an angle β1 > α1. Similarly, the end face 222.2 of the second screen 222, located above the optical axis 208, is inclined at an angle β2 > α2. For the two end faces 212.2 and 222.2, the inclinations are considered with respect to an edge corresponding to the intersection of the back face 212.1 or 222.1 with the end face 212.2 or 222.2. In other words, the inclinations β 1 and β 2 of each of the end faces 212.1 and 222.1 are such that each of said faces moves progressively away from the reflected rays 216 passing directly in front of the edge formed by the intersection of the back face 212.1 or 222.1 with the end face 212.2 or 222.2, moving away from said edge in the direction of propagation of the reflected rays 216.

[0065] There figure 9 is a schematic, side-view representation of a light module according to a fourth embodiment of the invention. The reference numbers of the third embodiment of the light module ( figure 7 ) are used to designate the same or corresponding elements, these numbers being increased by 100. Reference is also made to the description of these elements in the context of the third embodiment.

[0066] The light module 302 according to the fourth embodiment differs from the third embodiment essentially in that the end faces 312.2 and 322.2 of the first and second screens 312 and 322, respectively, are not inclined more than the reflected rays 316 passing near said faces, but exhibit light absorption properties, expressed by a reflectance ratio for visible light less than or equal to 30%, preferably 20%, and even more preferably 10%. This means that the reflected rays 316 from the ends of the light beam directed towards the lens 310 and striking the end faces 312.2 and 322.2 are absorbed, at least predominantly. If there are reflections, they are minor and negligible.

[0067] There Figure 10is a schematic, side-view representation of a light module according to a fifth embodiment of the invention. The reference numbers of the fourth embodiment of the light module ( figure 9 ) are used to designate the same or corresponding elements, these numbers being increased by 100. Reference is also made to the description of these elements in the context of the fourth embodiment.

[0068] The light module 402 according to the fifth embodiment differs from the fourth embodiment essentially in that the end face 422.2 of the second screen 422 is rounded and reflective.

[0069] As can be seen in the Figure 10The direct rays 414.2 striking the end face 422.2 are reflected towards a lower part, in this case the lower half, of the projection lens 410. The inclination of the reflected rays is such that these rays will be projected towards a lower part of the light beam. With reference to the figure 4 illustrating the luminous image of the lighting beam produced by a luminous module such as that of the figure 1 but also Figures 5 to 10The rays reflected by the end face 422.2 of the second screen, once projected by the projection lens 410, contribute to the formation of the luminous image at a distance from the horizontal cutoff edge. These rays will therefore not significantly disrupt the produced luminous image. This measure also optimizes luminous efficiency by recovering light that would otherwise be lost. The reflective properties of the end face can also be easily achieved when the screen is made of a naturally reflective material such as aluminum.

[0070] There figure 11 is a schematic representation, viewed from above, of the light module according to the fifth embodiment of the invention, while being applicable to each of the different embodiments of the invention.

[0071] It can be observed that the first screen 412 has a width, along a direction perpendicular to the optical axis 408, which is limited and determined by the light beam formed by the rays 414 emitted forwards directly by the light source 404 and capable of striking the lens 410. It can also be observed that the second screen 422 has a width, along the direction perpendicular to the optical axis 408, which is greater than that of the first screen 412, determined by the light beam formed by the rays 416 reflected by the reflective surface 406.2 of the collector 406, and capable of striking the lens 410. For this purpose, the second screen 422 can have a curved profile in the plane of view of the figure 11 . In this case, the rear face 422.1 of the second screen has a concave curved profile.

[0072] There figure 12is a perspective representation of a screen with an inclined end face and fully formed with a cooling radiator, as in the second embodiment in figures 5 and 6 .

[0073] We can observe at the figure 12 A plate 118 supports several light sources 104, and a screen 112 is positioned in front of each light source 104. In this case, the screens 112 are formed entirely with a heat sink made of a heat-conducting material such as aluminum or a specific plastic. The geometry of the screen 112, located at the center of the figure, is schematically represented by an inverted U-shaped envelope. The inclination of an angle β1 can be observed.

[0074] There figure 13is a perspective representation of a screen with an inclined end face and fully formed with a cooling radiator, as in the second embodiment in figures 5 and 6 , as an alternative to the figure 12 .

[0075] It can be observed that the end face 112.2 has an inclination of an angle β1 greater than at the figure 13 Also, the end face 112.2 is confused with a front face of the screen, unlike the figure 13 where the screen has a distinct front face.

[0076] In general, the various light modules described above can be integrated into a lighting device in combination with other light modules. Therefore, for the sake of clarity, the light source and the collector are each presented as unique. However, it is understood that certain light modules according to the invention may comprise several light sources and / or several collectors, in particular several collectors arranged side-by-side, each having a light source and an associated screen.

Claims

1. Light module (2; 102; 202; 302; 402) comprising: - a light source (4; 104; 204; 304; 404) capable of emitting light rays; - a collector (6; 106; 206; 306; 406) with a reflective surface (6.2; 102.6; 202.6; 302.6; 402.6) configured to collect and reflect a part of the light rays, called reflected light rays, into a reflected light beam along an optical axis (8; 108; 208; 308; 408) of the light module; - an optical system (10; 110; 210; 310; 410) configured to project at least the majority of the reflected light beam into a projected light beam by imaging a part of the reflective surface (6.2; 102.6; 202.6; 302.6; 402.6) located, following a general direction of propagation of the reflected light beam along the optical axis (8; 108; 208; 308; 408), at the rear of the light source (4; 104; 204; 304; 404); - a screen (12; 112; 212; 312; 412) located in front of the light source (4; 104; 204; 304; 404), following the general direction of propagation of the light beam along the optical axis (8; 108; 208; 308; 408), with a rear face (12.1; 112.1; 212.1; 312.1; 412.1) arranged so as to collect direct light rays (14; 114; 214.1; 314.1; 414.1) emitted forwards by the light source (4; 104; 204; 304; 404) and not reflected by the reflective surface (6.2; 102.6; 202.6; 302.6 ; 402.6) ; . characterized in that- The screen (12; 112; 212; 312; 412) comprises an end face (12.2; 112.2; 212.2; 312.2; 412.2), at a free end of the screen and opposite the reflected light rays (16; 116; 216; 316; 416), arranged so as to be away from said reflected light rays. - The screen (112; 212; 312; 412) extends transversely to the optical axis (108; 208; 308; 408) from a plate (118; 218; 318; 418) supporting the light source (104; 204; 304; 404). - The screen (112') is a protrusion of a radiator (120) for cooling the light source (104), said radiator being located on one face of the plate (118) opposite the light source (104) - the screen (112') extends to the front of the plate (118').

2. Light module (6) according to claim 1, wherein the end face (12.2) of the screen (12) has a length, along the general direction of propagation of the light beam along the optical axis (8), less than or equal to 1mm, allowing to avoid reflected light rays (16).

3. Light module (102; 202) according to claim 1 or 2, wherein the reflected rays have an inclination with respect to the optical axis, and wherein the end face (112.2; 212.2) of the screen (112; 212) has an inclination, with respect to the optical axis, greater than the inclination of the reflected rays (116; 216) adjacent to said end face, so as to be away from said reflected light rays.

4. Light module (2; 102; 202; 302; 402) according to any one of claims 1 to 3, wherein the optical system (10; 110; 210; 310; 410) has a focal area (10.3; 110.3) located on the reflective surface (6.2; 102.6; 202.6; 302.6; 402.6) of the collector (6; 106; 206; 306; 406), at the rear of the light source (4; 104; 204; 304; 404).

5. Light module (302; 402) according to any one of claims 1 to 4, wherein the end face (312.2; 412.2) of the screen (312; 412) has a reflectance in the visible light spectrum of less than 0.

3.

6. Light module (2; 102; 202; 302; 402) according to any one of claims 1 to 5, wherein the screen (12; 112; 212; 312; 412) is opposite the reflective surface (6.2; 102.6; 202.6; 302.6; 402.6).

7. A light module (202; 302; 402) according to any one of claims 1 to 6, wherein the screen (212; 312; 412) is a first screen located on the same side of the optical axis (208; 308; 408) as the light source (204; 304; 404), said light module comprising a second screen (222; 322; 422) located on the opposite side of the optical axis (208; 308; 408) and in front of the reflective surface (206.2; 306.2; 406.2), and comprising a rear face (222.1; 322.1; 422.1) configured to collect direct light rays (214.2; 314.2; 414.2) emitted forwards by the light source (204 ; 304 ; 404), not reflected by the reflective surface (206.2 ; 306.2 ; 406.2) and passing by the end face (212.2 ; 312.2 ; 412.2) of the first screen (212 ; 312 ; 412) and between this end face and the reflective surface.

8. Light module (202; 302; 402) according to claim 7, wherein the second screen (222; 322; 422) comprises an end face, (222.2; 322.2; 422.2) at a free end of the second screen and opposite the reflected light rays (216; 316; 416), arranged so as to be away from said reflected light rays, to absorb and / or reflect said reflected light rays towards a lower half of the reflected light beam.

9. Light module (202) according to claim 8, wherein the reflected rays have an inclination with respect to the optical axis, and wherein the end face (222.2) of the second screen (222) has an inclination, with respect to the optical axis, greater than the inclination of the reflected rays (216) adjacent to said end face, so as to be away from said reflected light rays.

10. Light module (302) according to claim 8, wherein the end face (322.2) of the second screen (322) has a reflectance in the visible light spectrum of less than 0.

3.

11. Light module (402) according to claim 8, wherein the end face (422.2) of the second screen (422) has a convex curvature suitable for reflecting the reflected light rays towards the lower half of the light beam.

12. Light module (202; 302; 402) according to any one of claims 7 to 11, wherein the second screen (222; 322; 422) is located in front of the reflective surface (206.2; 306.2; 406.2) of the collector (206; 306; 406).

13. Light module (202; 302; 402) according to any one of claims 7 to 12, wherein the second screen (222; 322; 422) is supported by the collector (206; 306; 406).

14. Vehicle projector comprising a light module according to one of the preceding claims.

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