Multi-functional lighting module for motor vehicle

Abstract

The invention relates to a lighting module (102) for a motor vehicle, comprising: a first light source (104); a first light collector (106); a second light source (110); a second light collector (112), the second light collector being adjacent to the first light collector (106); a projection optical device (108) for projecting the light rays reflected by the first and second light collectors (106, 112), the projection optical device having a first incident surface (108.1. 1) and a second incident surface (108.1. 2); a partition wall (118) that separates the light rays reflected by the first light collector (106) and the light rays reflected by the second light collector (112); wherein the partition wall (118) is made of a material that is transparent or translucent in the visible spectrum and is configured to transmit a portion of the light reflected by one of the first and second light collectors (106, 112) towards the opposite incident surface (108.1. 2).

Description

Field of the Invention

[0001] The present invention relates to the field of lighting, and more particularly to lighting for motor vehicles. Background Art

[0002] The published patent document FR 3 093 789 A1 discloses a lighting device that images the illuminated surfaces of at least two collectors in order to participate in the execution of two lighting functions. For this purpose, light sources are placed vertically on both sides of the optical axis and in such a way that illumination occurs in opposite directions. The light reflected by the upper collector is projected by the upper part of the projection optical device into a first light beam, and the light reflected by the lower collector is projected by the lower part of the projection optical device into a second light beam. The first light beam participates in the execution of a first lighting function, and the first and second light beams together participate in the execution of a second lighting function. An absorption screen is placed substantially along the optical axis between the light source and the projection optical device. This screen is intended to prevent any transmission of light from the upper part to the lower part and vice versa. However, a drawback of this lighting device is that when the first function is activated, only the upper part of the projection optical device is illuminated. The lower part of the projection optical device is not illuminated. Conversely, when the second lighting function is activated, the upper and lower parts of the projection optical device are illuminated. In other words, the projection optical device is fully illuminated. Thus, the projection optical device has at least two illuminated appearances, one in which the projection optical device is fully illuminated and one in which the projection optical device is only partially illuminated. However, this difference between the two lighting functions is undesirable, especially from an aesthetic point of view and from the point of view of the styling of motor vehicles.

[0003] In addition, when the second lighting function is activated, the presence of the absorption screen creates a dark area in the projection optical device between the upper and lower parts of the projection optical device. Summary of the Invention

[0004] The object of the present invention is to alleviate at least one of the drawbacks of the above prior art. More particularly, the object of the present invention is to allow the projection optical device of a multifunctional lighting module or device to have the following appearance: although various lighting functions are emitted, this appearance remains uniform when no lighting function is activated.

[0005] The subject of the present invention is an illumination module, in particular for a motor vehicle, the illumination module comprising: at least a first light source capable of emitting a first light ray; a first light collector having a first reflective surface configured to reflect the first light ray into a first light ray reflected in a first main direction parallel to the optical axis of the illumination module; at least a second light source capable of emitting a second light ray; a second light collector adjacent to the first light collector and having a second reflective surface configured to reflect the second light ray into a second light ray reflected in a second main direction parallel to the first main direction; a projection optical device for projecting the first and second reflected light rays along the optical axis, the projection optical device having a first incident surface for the first reflected light ray and a second incident surface for the second reflected light ray; a partition wall between the first reflected light ray and the second reflected light ray, the partition wall being located between the projection optical device and the first and second light collectors; wherein the partition wall is made of a material that is transparent or translucent in the visible spectrum and is configured to transmit a part of the first reflected light ray towards the second incident surface and / or transmit a part of the second reflected light ray towards the first incident surface.

[0006] The projection optical device allows the first reflected light ray to be projected as a first light beam via the first incident surface. The optical device also allows the second reflected light ray to be projected as a second light beam via the second incident surface.

[0007] For example, the first light beam can participate in performing a first lighting function, and the first and second light beams can together participate in performing a second lighting function. In due course, the first lighting function can be a function of the "low beam" type with an upper horizontal cut-off, and the second lighting function can be a function of the "high beam" type without a horizontal cut-off.

[0008] Alternatively, the first light beam can participate in performing a first lighting function, and the second light beam can participate in performing a second lighting function.

[0009] According to an advantageous embodiment of the invention, the parts of the first and second reflected light rays respectively transmitted towards the second incident surface and the first incident surface are between 5% and 30% of the intensity of the first reflected light ray or the second reflected light ray.

[0010] According to an advantageous embodiment of the invention, the translucent material is milky white.

[0011] According to an advantageous embodiment of the invention, the translucent material has a haze greater than or equal to 30% in the visible spectrum according to the test of ASTM D1003-21.

[0012] According to an advantageous embodiment of the invention, the translucent material is absorptive in the visible spectrum and has an absorption coefficient α in the visible spectrum according to the Beer-Lambert law, where 0.5 mm -1 ≥ α ≥ 0.3 mm -1 .

[0013] According to an advantageous embodiment of the invention, the partition wall has a light exit surface facing the projection optical device.

[0014] According to an advantageous embodiment of the invention, the lighting module further comprises at least one auxiliary light source placed so as to illuminate at least one light incident surface of the partition wall. Advantageously, the at least one auxiliary light source is placed facing the at least one light incident surface.

[0015] According to an advantageous embodiment of the invention, at least one light incident surface of the partition wall is opposite to and transverse to the light axis with respect to the light exit surface of the partition wall.

[0016] According to an advantageous embodiment of the invention, when the lighting module is in its normal mounting position, the at least one first light source and the at least one second light source are placed so as to illuminate in two opposite directions transverse to the light axis, and the at least one first light source and the first condenser are placed above the at least one second light source and the second condenser.

[0017] According to an advantageous embodiment of the invention, when the lighting module is in the normal mounting position, the at least one first light source and the at least one second light source are placed so as to illuminate horizontally in corresponding main directions transverse to the light axis and on both sides of the light axis.

[0018] Advantageously, the lighting module comprises at least one lateral light barrier placed between at least one of the first condenser and the second condenser and the projection optical device so as to intercept stray light in the first reflected light and / or the second reflected light, and the at least one lateral light barrier is made of a material that is transparent or translucent in the visible spectrum and is configured to transmit a part of the intercepted stray light towards the first incident surface and / or the second incident surface of the projection optical device.

[0019] The advantage of the measures of the invention is that these measures make it possible to ensure that the entire projection optical device has an illuminated appearance during the individual emission of the first light beam, during the individual emission of the second light beam, and during the simultaneous emission of the first light beam and the second light beam using simple, economical and non-bulky devices.

[0020] The measures of the present invention also make it possible to ensure a satisfactory unlit appearance. The textured and / or translucent or milky white characteristics of the material forming the partition wall and / or the lateral screen make it possible to achieve a uniform unlit appearance, thus masking certain details of the internal structure of the lighting module. The absorptive properties of the material forming the partition wall improve the unlit appearance because the partition wall then darkens. The absorptive properties of the material forming the partition wall also limit the amount of first and second reflected light rays that can be transmitted to the other side of the partition wall, and thus limit the amount of first reflected light rays that interfere with the second reflected light rays. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic cross-sectional view of a dual-function lighting module according to the prior art, with both functions activated at this time;

[0022] Figure 2 corresponds to Figure 1 , with only one function activated at this time;

[0023] Figure 3 is a schematic cross-sectional view of a dual-function lighting module according to a first embodiment of the present invention, with only one function activated at this time, wherein the partition wall is transparent and textured;

[0024] Figure 4 corresponds to Figure 3 , but the partition wall is translucent or milky white;

[0025] Figure 5 corresponds to Figure 3 , but the partition wall is translucent or milky white and absorptive;

[0026] Figure 6 is a schematic cross-sectional view of a dual-function lighting module according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0027] In the description of the present invention, concepts regarding relative positioning such as "upper", "above", "lower", "below", "upward", "downward", "lateral", "left", "right", etc. should be understood in relation to the lighting module being in its normal and operating position, as shown in the figures.

[0028] Figure 1 and Figure 2 show a dual-function lighting module according to the prior art.

[0029] ​​​​​​The lighting module 2 includes: a first light source 4 that illuminates in an upwardly directed main direction; a first light concentrator 6 that has a dome-shaped reflective surface with an aperture thereof directed towards the first light source 4; and a first lens 8a that is configured to project the light reflected by the first light concentrator 6. The first projection lens 8a projects the light reflected by the first light concentrator 6 into a first light beam.

[0030] The lighting module 2 further includes: a second light source 10 that illuminates in a downwardly directed main direction; a second light concentrator 12 that has a dome-shaped reflective surface with an aperture thereof directed towards the second light source 10; and a second lens 8b that is configured to project the light reflected by the second light concentrator 12. The second projection lens 8b projects the light reflected by the second light concentrator 12 into a second light beam.

[0031] The first projection lens 8a and the second projection lens 8b are integral and form a projection optical device 8. The first projection lens 8a and the second projection lens 8b each have an incident surface and an exit surface. The projection optical device 8 includes: an upper incident surface 8.1.1 that is formed by the incident surface of the first projection lens 8a; and a lower incident surface 8.1.2 that is formed by the incident surface of the second projection lens 8b. The projection optical device 8 further includes an exit surface 8.2 that is formed by the exit surfaces of the first projection lens 8a and the second projection lens 8b and substantially covers the upper incident surface 8.1.1 and the lower incident surface 8.1.2.

[0032] The first light source 4 and the second light source 10, the first light concentrator 6 and the second light concentrator 12, and the projection optical device 8 are aligned along the optical axis 14 of the lighting module 2.

[0033] It should be noted that each of the first projection lens 8a and the second projection lens 8b has a specific optical axis associated with the first light source and the second light source. Then, the optical axis 14 of the lighting module can be considered as the average optical axis of the projection optical device 8 formed by the first projection lens 8a and the second projection lens 8b.

[0034] The first light source 4 and the second light source 10 are opposite to each other. In particular, the first light source 4 and the second light source 10 are placed on opposite sides of a common carrier 16. The common carrier 16 also serves as a heat sink. In the illustrated example, the common carrier 16 is aligned with the optical axis 14. Thus, the main emission axes of each of the light sources 4, 10 are perpendicular to the optical axis 14.

[0035] The lighting module 2 further includes a partition wall 18 which extends along the optical axis 14 between on the one hand the first light source 4 and the second light source 10 and on the other hand the projection optical device. The partition wall 18 is opaque and thus blocks any light rays from the first light source 4, in particular those reflected by the first condenser 6 and which, in the absence of the partition wall 18, would easily reach the lower incident surface 8.1.2 of the projection optical device 8 and thus interfere with the light beam normally produced by the second light source 10 and the second condenser 12. The same applies to the light rays from the second light source 10, in particular those reflected by the second condenser 6 and which, in the absence of the partition wall 18, would easily reach the upper incident surface 8.1.1 of the projection optical device 8.

[0036] It should be noted that the first projection lens 8a and the second projection lens 8b each have a focal point which is located respectively on the reflection surface of the first condenser 6 and on the reflection surface of the second condenser 12 in order to image these reflection surfaces (which are then illuminated by the corresponding light sources). In particular, the focal point of the first projection lens 8a may be located near the rear edge of the first condenser 6, and / or the focal point of the second projection lens 8b may be located near the rear edge of the second condenser 12. "Located near" means located at a distance less than or equal to 10 mm.

[0037] The reflection surface of each of the first condenser 6 and the second condenser 12 has a substantially elliptical or parabolic profile, with the focal point located at the corresponding light source, such that the light rays emitted thus are reflected towards the projection optical device 8. The light beam projected thus is an inverted image of the illuminated reflection surface. In the case where the profile is elliptical, taking into account the emission direction of the light in the lighting module 2, the profile may have a second focal point which is located near or in front of the projection optical device 8.

[0038] Figure 1 The lighting module 2 is shown when the first light beam and the second light beam are being emitted. A front view of the exit surface 8.2 of the projection optical device 8 is shown on the right in Figure 1 It can be seen that the entire exit surface 8.2 is illuminated, the upper part being illuminated by the first light beam and the lower part being illuminated by the second light beam.

[0039] Figure 2 The lighting module 2 is shown when only the first light beam is being emitted. It is shown on the right in Figure 2A front view of the exit surface 8.2 of the projection optical device 8 is shown on the right. It can be seen that only the upper part of the exit surface 8.2 is illuminated, and the lower part remains completely unilluminated and is thus dark relative to the upper part. This situation is particularly likely to occur when the first light beam participates in forming the first illumination function, which takes the form of an illumination function including an upper horizontal cut-off, i.e., for example, a "low beam" or "near beam" function, which can operate without the second light beam.

[0040] For example, the second light beam can be a light beam without a horizontal cut-off and form a "complementary high beam" distribution, which is added to the "low beam" function so that a "high beam" or "main beam" function can be formed. Therefore, the activation of the second illumination function causes both the upper part of the exit surface 8.2 and the lower part of the exit surface 8.2 to be illuminated, as Figure 1 shown.

[0041] Therefore, when the first illumination function is being executed (in this case, the projection optical device is partially illuminated) and when the second illumination function is being executed (in this case, the projection optical device is fully illuminated), the illuminated appearance of the projection optical device 8 is different. This difference in the illuminated appearance of the lighting module is aesthetically and stylistically undesirable.

[0042] Figure 3 Shows a lighting module according to a first embodiment of the present invention. The reference numerals of the lighting modules of Figure 1 and Figure 2 are used to denote the same or corresponding elements, although these reference numerals have been increased by 100. In addition, reference is made to the description of these elements given with respect to Figure 1 and Figure 2 . Specific reference numerals between 100 and 200 are used to denote the elements specific to this embodiment.

[0043] According to the first embodiment of the present invention, Figure 3 the lighting module 102 of Figure 1 and Figure 2 is basically different from the lighting modules of Figure 3 in that the partition wall 118 is transparent and textured so as to allow a part of the light reflected by the first condenser 106 (i.e., the light incident on the upper surface 118.1 of the partition wall 118) to pass through the partition wall 118 and propagate towards the lower incident surface 108.1.2 of the projection optical device 108. Therefore, this allows the exit surface 108.2 of the projection optical device 108 (the front view of which has been shown on the right in

[0044] In Figure 3As can be seen, the first light beam (generated by the first light source 104, the first condenser 106, and the first projection lens 108a) activates and passes through the partition wall 118 to illuminate the lower incident surface 108.1.2 of the projection optical device 108. However, it should be understood that vice versa, when the second light source is activated, the second light beam (generated by the second light source 110, the second condenser 112, and the second projection lens 108b) can pass through the partition wall 118 to illuminate the upper incident surface 108.1.1 of the projection optical device 108.

[0045] The partition wall 118 can have texture on one or each of the upper surface 118.1 and the lower surface 118.2. When only one of the first light beam and the second light beam can be individually activated, only the surface of the partition wall 118 facing the condenser (the surface that reflects the light rays formed by the first light beam or the second light beam) can have texture. Refer to Figure 3 , the first light beam (generated by the first light source 104, the first condenser 106, and the first projection lens 108a) can be individually activated to form a first illumination function. The first illumination function can be a motor vehicle lighting function, and the motor vehicle lighting function includes an upper horizontal cut-off, that is, for example, "low beam" or "near beam". Then, only the upper surface 118.1 of the partition wall 118 can have texture so as to scatter the light incident on the said surface in the thickness of the partition wall 118. Then, these light rays pass through the refractive interface formed by the lower surface 118.2 and propagate through the air to the lower incident surface 108.1.2 of the projection optical device 108, as Figure 3 shown.

[0046] It should also be noted that the partition wall 118 can have a light-emitting surface 118.3 by virtue of its transparent material, and this light-emitting surface faces the projection optical device 108. In the current case, this light-emitting surface 118.3 is the front surface of the partition wall 118 and is placed directly facing the projection optical device 108. Part of the light scattered into the partition wall 118 from one of the upper surface 118.1 and the lower surface 118.2 can propagate along the partition wall 118 via successive total reflections, and then the partition wall 118 acts as a light guide. Then, the light exiting from the light-emitting surface 118.3 enters the projection optical device 108 at the junction of the upper incident surface 108.1.1 and the lower incident surface 108.1.2. This light enables ensuring that the exit surface 108.2 is illuminated at the junction of the upper part and the lower part corresponding to the upper incident surface 108.1.1 and the lower incident surface 108.1.2.

[0047] As Figure 3The advantage of the shown configuration of the partition wall 118 is that when only one of the first and second light beams is activated, the illuminated appearance of the exit surface 108.2 of the projection optical device is relatively uniform without adding complex and expensive elements, especially additional light sources for example. However, the disadvantage of this is that the portion of the light of one of the first and second light beams passing through the partition wall 118 is large enough to interfere with the formation of the other of the first and second light beams. This effect is generally referred to as crosstalk. In addition, when neither the first nor the second light beam is activated, the closed appearance of the exit surface 108.2 of the projection optical device 108 is white or milky, while a dark and matte appearance is generally desired.

[0048] Figure 4 A lighting module according to a first embodiment of the present invention is shown, such as Figure 3 shown, but wherein the partition wall 118' is translucent or milky white. If a material allows light to pass through but does not allow an object to be clearly visible due to multiple anisotropic refractions of the light, the material is called translucent. Opalescence is an optical property of a transparent or translucent material that gives the material a milky appearance or hue, where the iridescent reflection is reminiscent of the iridescent reflection of an opal.

[0049] The haze or opalescence of a material can be determined according to the test method of ASTM D1003-21. When a material has a haze greater than 30%, the material is considered diffusive. Advantageously, the material of the partition wall 118' has a haze greater than 30%. This then ensures that a portion of the light emitted by one of the lighting functions is transmitted to the other lighting function.

[0050] Figure 5 A lighting module according to a first embodiment of the present invention is shown, such as Figure 4 shown, but wherein the partition wall 118'' is absorbent in addition to being translucent or milky white. For this purpose, the material can be a so-called "smoked" material, i.e., a material that contains dark particles in its body, and these dark particles are capable of absorbing a portion of the light passing through the material (light in the visible spectrum in the current case).

[0051] The absorbent property of a transparent or translucent material can be evaluated and determined by the Beer-Lambert law, i.e.,

[0052] [Equation 1]

[0053] I(λ,X) = I0(λ)·e -αX

[0054] Wherein, I0(λ) is the intensity incident on the material varying with the wavelength λ (ignoring Fresnel reflection), I(λ,X) is the intensity emitted from the material varying with the wavelength λ (ignoring Fresnel reflection), X is the thickness of the material (in mm), and α is the absorption coefficient of the material (in mm -1 units).

[0055] For example, a transparent and colorless material (such as PMMA) has an absorption coefficient of 0.03mm -1 ≥α≥0.0001mm -1 while a "smoked" transparent or translucent material has an absorption coefficient of 0.5mm -1 ≥α≥0.3mm -1 of the absorption coefficient.

[0056] The absorptive and translucent or milky white material of the partition wall 118” has an absorption coefficient of 0.5mm -1 ≥α≥0.3mm -1 of the absorption coefficient.

[0057] The advantage of the absorptive property of the transparent or translucent material of the partition wall is that this absorptive property enables the limitation of the part of light transferred from one function to another function, while allowing sufficient transfer to ensure a uniform illuminated appearance when only one function is activated. The absorptive property of the transparent or translucent material also ensures an overall dark and matte closed appearance.

[0058] Referring Figure 5 , one or more auxiliary light sources 120 can be arranged facing the light incident surface 118”.4 of the partition wall 118”. The light emitted by these one or more auxiliary light sources 120 enters the partition wall 118” and propagates longitudinally along the optical axis 114 through successive total internal reflections at the refractive interface formed between the upper surface 118”.1 and the lower surface 118”.2 and the ambient air. Then, these light rays reach the light exit surface 118”.3 and feed the middle part of the projection optical device at the junction of the upper incident surface 108.1.1 and the lower incident surface 108.1.2. Advantageously, these one or more auxiliary light sources 120 are placed on a common carrier 116, which also serves as a heat sink for these light sources. More specifically, the first light source 104 and the second light source 110 can be placed on separate parallel plates carried by the common carrier 116, which extends along the optical axis 114. Then, one or more auxiliary light sources 120 can be placed on the front surface of the common carrier 116.

[0059] It should be understood that what has just been described regarding one or more auxiliary light sources also applies to Figure 3 and Figure 4 .

[0060] Figure 6 shows a lighting module according to a second embodiment of the present invention. The same or corresponding elements have been denoted by the reference numerals of the lighting module used Figures 3 to 5 , although these reference numerals have been increased by 100. Furthermore, reference is made to the description of these elements given with respect to Figures 3 to 5 . Specific reference numerals between 200 and 300 have been used to denote the elements specific to this embodiment.

[0061] The lighting module 202 of the second embodiment differs from the lighting module of the first embodiment essentially in that the first and second light beams are emitted side by side instead of one above the other. For this purpose, the collectors 206, 212 are juxtaposed in the lateral direction instead of being stacked one above the other in the vertical direction as in the first embodiment. Similar to the Figure 3 , Figure 4 and Figure 5 partition walls 118, 118' and 118'' of, the central partition wall 218.1 between the first collector 206 and the second collector 212 is made of a transparent, translucent or milky white and optionally absorptive material.

[0062] The lighting module includes a plurality of first light sources 204 which are distributed transversely to the optical axis 214 of the projection optical device 208. The first collector 206 forms a plurality of reflecting domes which are adjacent to each other and whose apertures are directed towards the corresponding light sources. The first light sources 204, the first collector 206 and the first projection lens 208a form a first light beam. The first light beam participates in forming a first lighting function which is here a motor vehicle lighting function without an upper horizontal cut-off, commonly referred to as the "complementary high beam" function, and which, when added to the "low beam" function, allows the formation of a function called "high beam" or "main beam". This function is called a matrix function because it forms a light beam which is divided into selectively activatable adjacent luminous zones, each luminous zone corresponding to one of the first light sources 204 and the corresponding reflecting dome of the first collector 206. Then, the first light sources 204 illuminate downwards, and the first collector 206 is located below the first light sources 204. The reflected light rays emitted by the first light sources 204 and reflected by the first collector 206 propagate towards the incident surface of the first projection lens 208a, thus forming the left incident surface 208.1.1 of the projection optical device 208.

[0063] The lighting module includes a plurality of second light sources 210, which are similar to the first light source 204 and are distributed transversely to the optical axis 214 of the projection optical device 208. Similar to the first condenser 206, the second condenser 212 forms a plurality of reflecting domes that are adjacent to each other and whose apertures are directed towards the corresponding light sources. The second light sources 210, the second condenser 212, and the second projection lens 208b form a second light beam. The second light beam participates in forming a second lighting function, which in this case is a motor vehicle lighting function that does not include an upper horizontal cut-off. For example, the second lighting function can be a matrix "complementary high beam" function, thus completing the lighting function performed by the first light source 204 and the first condenser 206. The reflected light rays emitted by the second light sources 210 and reflected by the second condenser 212 propagate towards the incident surface of the second projection lens 208b, thereby forming the right incident surface 208.1.2 of the projection optical device 208.

[0064] It should be noted that each of the first projection lens 208a and the second projection lens 208b has a specific optical axis associated with the corresponding light source, and these two optical axes are preferably parallel. The optical axis 214 of the lighting module can be considered as the average optical axis of the projection optical device 208 formed by the first projection lens 208a and the second projection lens 208b.

[0065] Advantageously, the central partition wall 218.1 between the above-mentioned first light beam and the second light beam is made of a transparent, translucent, or milky white and optionally absorptive material, so as to allow a part of the light rays of the first light beam and the second light beam to reach the opposite incident surfaces 208.1.1 or 208.1.2 of the projection optical device 208.

[0066] Similar to Figure 5 the lighting module, one or more auxiliary light sources 220.1 can be placed facing the light incident surface of the central partition wall 218.1.

[0067] The lighting module 204 also includes lateral baffles 222.1 and 222.2, which are longitudinally placed between the projection optical device 208 and the first condenser 206 and the second condenser 212. These lateral baffles 222.1 and 222.2 are placed so as to intercept and block certain stray reflected light rays that are likely to reduce the clarity of certain light-emitting areas of the matrix light-emitting image. Similar to Figure 3 、 Figure 4 and Figure 5The dividing partitions 118, 118', and 118'' are similar. At least one of the two transverse baffles 222.1 and 222.2 (in the current case, each transverse baffle) is made of a transparent, translucent, or milky white, and optionally absorptive material in such a way as to ensure illumination of other unilluminated portions of the corresponding incident surfaces 208.1.1 or 208.1.2. Specifically, it can be seen that each of the first light collector 206 and the second light collector 212 is configured to horizontally converge the reflected light rays towards the central portion of the corresponding incident surface 208.1.1 or 208.1.2 of the projection optical device 208. The transverse baffles 222.1 and 222.2 made of a transparent, translucent, or milky white, and optionally absorptive material make it possible to ensure illumination of other unilluminated portions of the corresponding incident surface of the projection optical device 208, although the illumination is weak.

[0068] In addition to the central dividing partition 218.1, the illumination module 202 may include lateral dividing partitions 218.2 and 218.3. Similar to Figure 3 , Figure 4 and Figure 5 the dividing partitions 118, 118', and 118'', these dividing partitions may also be made of a transparent, translucent, or milky white, and optionally absorptive material. This is particularly useful when one or more auxiliary light sources 220.2 and 220.3 are placed facing the light incident surfaces of the lateral dividing partitions 218.2 and 218.3 under discussion. It should be noted that the illumination module 202 is not limited to the two functions described above and Figure 6 shown. Specifically, other functions regarding the Figure 6 shown laterally placed functions may be provided, such as in particular an illumination function including an upper horizontal cut-off, and more particularly an illumination function including a flat and horizontally extending upper horizontal cut-off, which is completed by a horizontally narrow illumination function including a kinked upper cut-off. For example, these additional functions may be placed directly laterally to the right of the lateral dividing partition 218.3. In this case, the fact that this dividing partition is made of a transparent, translucent, or milky white, and optionally absorptive material allows a portion of the light rays emitted by the adjacent illumination function to be transmitted towards the right incident surface 208.1.2 of the projection optical device. It should be understood that in the presence of additional illumination functions, the projection optical device is further extended to these functions.

[0069] It can be seen from Figure 6 that the dividing partitions 218.1, 218.2, and 218.3 may have a cross-section that varies along their extent, along the optical axis 214. In the current case, the thickness of the dividing partition gradually decreases from the rear to the front (i.e., in the main direction of light propagation).

[0070] Generally, although the lighting modules according to the above two embodiments include a projection optical device in the form of juxtaposed projection lenses, it should be noted that other forms of projection optical devices can be envisaged, in particular mirror-based projection optical devices such as those shown in FIGS. 16 and 17 of the published patent application WO 2020 / 025171 A1.

Claims

1. A lighting module (102; (202) A lighting module, in particular for a motor vehicle, the lighting module comprising: - at least a first light source (104; 204) capable of emitting a first light beam; - a first condenser (106; 206) having a first reflective surface configured to reflect the first light beam into a first light beam reflected in a first main direction parallel to the optical axis (114; 214) of the lighting module; - at least a second light source (110; 210) capable of emitting a second light beam; - a second condenser (112; 212) adjacent to the first condenser (106; 206) and having a second reflective surface configured to reflect the second light beam into a second light beam reflected in a second main direction parallel to the first main direction; - a projection optical device (108; 208) for projecting the first and second reflected light beams along the optical axis (114; 214), the projection optical device having a first incident surface (108.1.1; 208.1.1) for the first reflected light beam and a second incident surface (108.1.2; 208.1.2) for the second reflected light beam; - a partition wall (118, 118’, 118”; 218.1) located between the projection optical device (108; 208) and the first and second condensers (106, 112; 206, 212); The partition wall (118, 118’, 118”; 218.1) is made of a material that is transparent or translucent in the visible spectrum and is configured to transmit a portion of the first reflected light beam towards the second incident surface (108.1.2; 208.1.2) and / or transmit a portion of the second reflected light beam towards the first incident surface (108.1.1; 208.1.1).

2. The lighting module (102; 202) according to claim 1, wherein, The portions of the first and second reflected light beams transmitted towards the second and first incident surfaces respectively are between 5% and 30% of the intensity of the first or second reflected light beam.

3. The lighting module (102; 202) according to any one of claims 1 and 2, wherein, The translucent material is milky white.

4. The lighting module (102; 202) according to any one of claims 1 to 3, wherein, According to the test of ASTM D1003-21, the translucent material has a haze of greater than or equal to 30% in the visible spectrum.

5. The lighting module (102; 202) according to any one of claims 1 to 4, wherein, The semi-transparent material is absorptive in the visible spectrum and has an absorption coefficient α in the visible spectrum according to the Beer-Lambert law, where 0.5 mm -1 ≥ α ≥ 0.3 mm -1 .

6. The lighting module (102) according to any one of claims 1 to 5, wherein, The partition wall (118, 118’, 118”) has a light exit surface (118.3, 118’.3, 118”.3) facing the projection optical device (108).

7. The lighting module (102; 202) according to any one of claims 1 to 6, the lighting module further comprising: - at least one auxiliary light source (120; 220.1) placed to illuminate at least one light incident surface (118”.4) of the partition wall.

8. The lighting module (102) according to claims 6 and 7, wherein, The at least one light incident surface (118”.4) of the partition wall (118”) is opposite to the light exit surface (118”.3) of the partition wall and is transverse to the optical axis (114).

9. The lighting module (102) according to any one of claims 1 to 8, wherein, When the illumination module (102) is in its normal mounting position, the at least one first light source (104) and the at least one second light source (110) are arranged to illuminate in two opposite directions transverse to the optical axis (114), and the at least one first light source (104) and the first light collector (106) are arranged above the at least one second light source (110) and the second light collector (212).

10. The lighting module (202) according to any one of claims 1 to 8, wherein, When the illumination module (202) is in the normal mounting position, the at least one first light source (206) and the at least one second light source (210) are arranged to illuminate horizontally in corresponding main directions transverse to the optical axis (214) and on both sides of the optical axis (214).

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