Light module for motor vehicle

Abstract

Light-emitting motor-vehicle module (1), the module comprising: - a plurality of light sources (10) configured to emit light rays (R); - a plurality of cavities (20) each having a first aperture (31) and a second aperture (32) opposite the first aperture (31), each light source (10) being associated with one cavity (20), in such a way that at least some of the light rays (R) emitted by each light source (10) enter the associated cavity (20) through the first aperture (31) and exit from said associated cavity (20) through the second aperture (32), the light sources (10) emitting radially.

Description

technical field

[0001] The present invention is in the field of the automotive industry, and relates more particularly to lighting devices for signaling the presence of the motor vehicle. Previous technique

[0002] We know of lighting systems for motor vehicles comprising a plurality of light sources configured to emit light beams and a plurality of light guides. Each light source is optically coupled to a base of one of the light guides, such that at least a portion of the light beams generated by each light source is injected into the associated light guide. These light beams exit the guide through an exit surface opposite the base. The light sources can be controlled individually or in groups. These lighting systems are called matrix systems because they allow the generation of a plurality of "light pixels" to create numerous lighting functions on motor vehicles.Such visual features allow, in particular, for indicating to a neighboring vehicle one or more pieces of information about the condition of the vehicle on which the device is mounted, such as information about the charge level, a malfunction, the speed, and / or the vehicle's future trajectory. They also allow for indicating to a neighboring vehicle one or more pieces of information about traffic conditions that the neighboring vehicle may not have been able to detect directly.

[0003] In the context of matrix lighting systems, the drawbacks of light-guided devices include their high cost and complex implementation. Another disadvantage of known devices is that the brightness varies within a pixel; that is, there are differences in brightness depending on the observed portion of a given pixel. This inhomogeneity is generally criticized by customers, who want each pixel to exhibit uniform brightness.

[0004] Furthermore, light-guided devices exhibit low luminous efficacy due to losses during both the coupling and guiding of the light rays. Consequently, the light sources must be powerful, increasing both power consumption and heat generation.

[0005] Finally, these devices are poorly suited to significant variations in depth, as depth is measured in the overall direction of the beam emitted by the device. Indeed, as the device's depth increases, manufacturing its components becomes complicated due to technical constraints related to manufacturing techniques, particularly injection molding. It then becomes impossible to manufacture these components using conventional processes, thus increasing costs. However, the shapes desired by customers have increasingly pronounced curves, which implies very different depths depending on the location on the device where they are measured. Description of the invention

[0006] The invention provides a vehicle information display device that at least partially overcomes the aforementioned drawbacks. The display device according to the invention is easy to implement and provides good pixel uniformity. It is also easily adaptable to various curved shapes using simple design elements. It exhibits good photometric efficiency, which reduces power consumption and heat generation while ensuring high brightness. The limited heat generation allows the use of inexpensive materials with limited heat resistance. The good photometric efficiency also reduces the number of light sources required or allows the use of less expensive light sources. These characteristics thus ensure a low cost for the device.It allows pixels to be displayed with a good level of homogeneity, and well separated from each other.

[0007] In this respect, the invention relates to a motor vehicle lighting module according to claim 1.

[0008] Radial emission refers to light emission occurring primarily laterally around the mounting axis of the light source. For example, in the case of an LED (Light Emitting Diode), the LED is mounted on a generally flat surface, at least locally at the LED's location. The radial emission is then lateral to an axis perpendicular to the plane of the surface.

[0009] Advantageously, the emission from the light source exhibits rotational symmetry around the mounting axis. This allows for homogeneous illumination all around the light source.

[0010] According to the invention, a radially emitting light source is installed opposite the cavity, with its emission peak directed towards the walls of said cavity. Thus, the majority of the light rays emitted by the light source go directly to these walls, and a small quantity of these rays, or even none of them, are directed directly towards the second opening and exit the cavity without having encountered any walls.

[0011] Advantageously, the module may include one or more of the following features, taken alone or in combination: The light sources are configured to be selectively activated; the light module includes a perforated mask located at a distance from the plurality of light sources along a direction of light ray propagation, the perforated mask comprising a grid forming a plurality of light cells opposite the cavities and associated light sources, each light cell being separate from a directly adjacent light cell; the light module includes a mask support placed opposite the second openings, so as to be traversed by the light rays, and supporting the perforated mask; the mask support is a diffuser; the perforated mask is a single piece with the mask support; the perforated mask and the mask support are obtained by bi-injection molding of plastic materials; the perforated mask is attached to the mask support, the perforated mask being fixed securely to the support by fastening means;The perforated mask is placed on the mask support; the grid of the perforated mask is formed by a layer of opaque material deposited on one face of the perforated mask; the cavities are formed by light-colored partitions, particularly white; the partitions have at least one textured surface to diffuse the light rays that strike them; some partitions are composed of a superposition of several sub-partitions; the light sources include one or more radially emitting light-emitting diodes.

[0012] The invention also relates to a motor vehicle lighting device comprising at least one lighting module according to the invention. Advantageously, the lighting device is intended to be mounted at the rear of a motor vehicle. Brief description of the drawings

[0013] The invention will be better understood upon reading the following description and examining the accompanying figures: [ Fig.1 ] is a schematic cross-sectional view of a module according to a first embodiment of the invention; [ Fig. 2 ] is a schematic cross-sectional view of a module according to a second embodiment of the invention; [ Fig.3 ] is a schematic cross-sectional view of a module according to a third embodiment of the invention; [ Fig. 4 ] is a schematic cross-sectional view of a module according to a fourth embodiment of the invention; [ Fig. 5a ] is a schematic side view of a light source positioned on a support; [ Fig. 5b ] is a diagram representing an example of the relative intensity of a radially emitting light source. Detailed description

[0014] The reference numbers of the first embodiment are used to designate identical or corresponding elements of the second, third, and fourth embodiments, these numbers being increased by 200, 300, and 400 respectively. Reference is also made to the description of these elements in the first embodiment. Elements appearing from the second embodiment onward follow a similar numbering system, having the same tens and units digits in all embodiments, and with a "2" for the second embodiment, a "3" for the third embodiment, and a "4" for the fourth embodiment as the hundreds digit. Reference is also made to the description of these elements in the preceding embodiments.

[0015] There [ Fig.1] is a schematic cross-sectional view of a module according to a first embodiment of the invention.

[0016] Module 1 comprises a plurality of light sources 10 arranged on a support 11. For example, the light sources are LEDs. The support can be a printed circuit board, for example, a PCB (Printed Circuit Board) or IMS (Insulated Metal Substrate). It can also be a flexible circuit board. In this case, the support is designed to supply power to the light sources 10 from an electrical power source. Alternatively, the support can be a heat sink without an electrical trace, with the power supply circuit for the light sources attached to it. The light sources 10 are configured to be selectively activated. The control module that operates them is configured to be able to switch each light source 10 on and off individually or in groups.

[0017] Each light source 10 is associated with a cavity 20 having a first opening 31 oriented towards the light source, and a second opening 32 opposite the first opening 31. In other words, with respect to the associated light source 10, the first opening 31 is proximal and the second opening is distal. Each cavity 20 corresponds, for example, to a through-hole in a cavity element of the module. Thus, the cavity element has a plurality of through-holes, each hole corresponding to a cavity 20, delimited by partitions 21. Each hole corresponds to a pixel that one wishes to illuminate. Alternatively, it is possible to use several cavity elements placed side by side which, once assembled, define the complete range of pixels.

[0018] Each light source 10 exhibits radial emission, meaning that the light rays R emitted by the light source, when powered, are oriented mostly laterally with respect to a mounting axis of the light source 10, and all around this axis. For example, in the case of an LED, the radial emission is lateral with respect to an axis perpendicular to the plane of the support. Such light sources are described in more detail in connection with figures 5a and Sb.

[0019] When the light source 10 is powered by electricity, by conventional means not shown in the figures, at least some of the emitted light rays R enter the associated cavity 20 through the first opening 31 and strike the partitions 21 of said cavity 20. They are reflected and / or scattered by said partitions 21, and some of them exit said associated cavity 20 through the second opening 32. The partitions 21 are advantageously made of a diffusing material, particularly a light color, especially white. Alternatively or complementarily, the walls of the partitions 21 may have a diffusing texture, in particular a grain. These characteristics have the effect of scattering the light rays R. This makes it possible to obtain good homogeneity in the illuminated appearance of a pixel.

[0020] The profile of each wall of partition 21 has a re-entrant angle, meaning that it comprises two portions, notably straight, forming a re-entrant angle β, i.e., greater than 180°, when viewed from cavity 20. Furthermore, the angle β has a value less than 270°. Thus, partition 21 has a cross-section in the shape of two opposing trapezoids whose longer bases are common. As an example, the common base is represented by a dashed line on the rightmost partition 21 of the [ Fig.1 ]. The angle is obtuse when viewed from inside partition 21. Thus, when cavity 20 is traversed from the first opening 31 to the second opening 32, the surface area of ​​its cross-section decreases, passes through a minimum, particularly at the level where the profile of the walls presents an angle, and then increases again.

[0021] This configuration allows for a significant depth of the cavities 21, particularly when the cavity element is produced by pressure injection molding, the depth of the cavity 21 being the distance between the first opening 31 and the second opening 32. Indeed, to ensure proper demolding of the cavity part, it is necessary to guarantee a minimum draft angle between the walls of the partitions 21 and the demolding axis. This draft angle is generally greater than 3°, and even greater than 5° when the wall has a texture, such as graining. However, it is also desirable to have a limited thickness of the partition 21.Since the maximum thickness of partition 21 is located approximately in its middle, it is possible to roughly double the height of said partition 21 compared to that which would be possible with a partition whose thickness increased continuously from the first opening 31 to the second opening 32, or vice versa, and which had the same maximum thickness. This results in cavities 20 with a depth of up to 20 mm. Furthermore, this shape of the partitions 21 also allows for better diffusion of light within the cavity 20, thus improving the level of homogeneity.

[0022] Advantageously, each cavity 20 is associated with a single light source 10. This optimizes the required flux because it avoids the shadows that could be cast by several light sources 10 positioned opposite the same cavity 20. These shadows correspond to a portion of the light rays R emitted by one light source and intercepted by a neighboring light source associated with the same cavity. These light rays R do not reach the partitions 21 and are therefore lost for the purpose of providing the light.

[0023] Alternatively, it may sometimes be necessary to associate at least some, or even all, of the cavities 20, each with several light sources 10. This is particularly the case when using a single light source 10 per cavity would not provide sufficient luminous flux, for example, either because each light source is not powerful enough, or because the lighting function to be performed requires a large amount of light. Using several light sources 10 in association with a cavity 20 then makes it possible to increase the available luminous flux in a cavity 20, despite the shadows cast.

[0024] In a preferred embodiment, module 1 includes a perforated mask 40 located at a distance from the light sources 10 along a path direction S of the light. The path direction of the light is understood as the general direction in which the light rays propagate within the cavity 20, oriented from the first aperture 31 to the second aperture 32. The perforated mask comprises a grid 41 forming a plurality of light cells 42 opposite the cavities 20 and their associated light sources 10. More precisely, each light cell 42 is opposite a cavity 20. Furthermore, each light cell 42 is separate from a directly adjacent light cell 42. Each light cell 42 corresponds to a pixel.

[0025] The perforated mask 40 can be placed on a mask support 50. The mask support 50 is advantageously made of a transparent or translucent material. A translucent material diffuses light throughout its mass; for example, it is of the opal type. Alternatively or in addition, the mask support 50 has at least one textured face, notably one with graining. The translucent material and / or the presence of graining improve the uniformity of the pixel's illuminated appearance.

[0026] The perforated mask 40 can be attached to the mask support 50, in particular by bonding or welding. Alternatively, the perforated mask 40 and the mask support 50 form a single piece obtained by two-material molding. In another alternative, the grid 41 is a layer of opaque material deposited on one face of the perforated mask, for example painted or printed onto the mask 40. This alternative is shown in the [ Fig. 2[by reference 241]. This layer of opaque material can also be a layer of metal, for example obtained by vacuum deposition. Alternatively, the layer of opaque material can form the perforated mask and be deposited directly onto the mask support.

[0027] It should be noted that all the alternatives described above for the mask and the mask support can be applied to all embodiments of the present invention.

[0028] There [ Fig. 2Figure ] is a schematic cross-sectional view of a module according to a second embodiment of the invention. This embodiment differs from the first embodiment in that certain cavities 220' have one or more partitions 221' obtained by the superposition of two sub-partitions 221a, 221a', 221b'. The sub-partitions 221a, 221a', 221b' defining a partition 221' are aligned. They are advantageously in contact. They define a cavity 220' with greater depth compared to the first embodiment. The sub-partitions 221a and 221a' have a similar or identical height, as do the sub-partitions 221b'. However, the height differs between the sub-partitions 221a and 221a' on the one hand, and 221b' on the other. In particular, sub-partitions 221b' have a lower height than sub-partitions 221a and 221a'.

[0029] Advantageously, the sub-partitions 221a have the same height as the partitions 221 with a single sub-partition. The partitions 221 and the sub-partitions 221a are part of the same cavity element. This allows the use of a first cavity element located near the light sources 210, defining the first opening 231 of each cavity 220, 220'. The first cavity element therefore uses the same height for all the partitions 221 and sub-partitions 221a it comprises.

[0030] The sub-partitions 221a' and 221b' form part of a second cavity element, superimposed on the first cavity element; that is, it is located between the first cavity element and the perforated mask 240. Thus, module 201 comprises a standardized first cavity element onto which a second cavity element is superimposed to increase the depth of at least some of the cavities. Advantageously, the sub-partitions 221a' and 221b' have a height that increases from one edge of module 201 to the other.

[0031] The partitions 221 comprising a single sub-partition, and the sub-partitions 221a, 221a', 221b' have the same characteristics as the partitions 21 of the first embodiment. Thus, the sub-partitions are standardized elements, or at least have a standardized design, thereby reducing design and / or manufacturing costs.

[0032] This embodiment allows module 201 to be adapted to the external curve of the vehicle on which it is intended to be installed.

[0033] It should be noted that to accommodate a more pronounced curve, three or more sub-partitions can be stacked to form a partition. The sub-partitions can have the characteristics described above.

[0034] There [ Fig.3Figure ] is a schematic cross-sectional view of a module according to a third embodiment of the invention. This embodiment differs from the second embodiment in that the first cavity element is now positioned opposite the perforated mask 340 and in that the module comprises a first support 311' and a second support 311" for the light sources 310. The second support 311" is offset rearward relative to the first support 311', taking as a reference the direction S of the light path. The second cavity element is located between the first cavity element and the light sources 310 located on the second support 311".

[0035] The second cavity element includes sub-partitions 321b' of similar or identical height. Each sub-partition 321b' is advantageously in contact with the sub-partition 321a of the first cavity element, with which it defines a partition 321'. The second cavity element also includes at least one sub-partition 321b" of a different height than the sub-partitions 321b', in particular a shorter height. This sub-partition 312b" is located at the edge of the second cavity element and is intended to extend at least partially beneath the first support 311'. This configuration is advantageous for having an identical width for all cavities 320, 320', while utilizing a first support 311' of significant extension, which allows for good dissipation of the heat generated by the light sources 310 located on said first support 311'.

[0036] The partitions 321 comprising a single sub-partition, and the sub-partitions 321a, 321b', 321b" have the same characteristics as the partitions 21 of the first embodiment.

[0037] This embodiment allows the depth of the module to be adapted, particularly when the external curve of the vehicle on which it is intended to be installed is not very pronounced.

[0038] There [ Fig. 4 Figure ] is a schematic cross-sectional view of a module according to a fourth embodiment of the invention. This embodiment differs from the third embodiment in that the partition 421b" is not located under the support 411' but on its side. This configuration is advantageous for having standardized sub-partitions 421b', 421b", that is, all having an identical cross-section.

[0039] The partitions 421 comprising a single sub-partition, and the sub-partitions 421a, 421b', 421b" have the same characteristics as the partitions 21 of the first embodiment.

[0040] In the third and fourth embodiments, it should be noted that to accommodate a more pronounced change in depth, three or more sub-partitions can be stacked to form a partition. The sub-partitions may have the characteristics described above.

[0041] According to an embodiment not shown, the first cavity element of the third and fourth embodiments has partitions of variable height, similar to that described for the second cavity element of the second embodiment. This allows the module 301, 401 of the third and fourth embodiments to be further adapted to the external curve of the vehicle on which it is intended to be installed.

[0042] In relation to figures 5a and 5b We describe the light emission characteristics of a radially emitting light source.

[0043] There [ Fig. 5a Figure 10 represents a schematic side view of a light source 10 positioned on a support 11. The light source 10 has a mounting axis X, perpendicular to the support 11. When powered, the light source 10 emits light rays R, mostly oriented laterally with respect to the mounting axis X. These rays form a light intensity indicator that depends on the direction measured by the angle α with respect to the mounting axis X.

[0044] There [ Fig. 5b ] represents a diagram of an example of the relative intensity of the light source of the [ Fig. 5a In other words, it is a diagram of the light intensity indicator of the light source.

[0045] The x-axis represents the value of angle α. The y-axis represents the relative intensity of light emitted by the light source 10 in the direction corresponding to angle α. The value 100 is assigned to the maximum intensity emitted by the source in a given direction. The curve is thus expressed as a percentage of this maximum value.

[0046] This diagram shows that the emission from the light source 10 is symmetrical with respect to the mounting axis X, meaning that the intensity value is approximately the same for a direction corresponding to the angle +α and the angle -α. More precisely, the diagram of the [ Fig. 5b ] represents the emission of the source in a radial plane containing the mounting axis X. Thus, the emission of the light source 10 has a rotational symmetry about said mounting axis X, that is, regardless of the orientation of the radial plane around the mounting axis X.

[0047] For convenience, we use the notation +α and -α only to specify whether the direction in question is to the right or to the left. When only the absolute value α is used, it means that the characteristic applies equally to both sides.

[0048] In particular, a maximum value, or emission peak, is found for angles αpic+ and αpic- of approximately +85° and -85°, respectively. We use the notation αpic to denote the absolute value of the angles αpic+ and αpic-. Furthermore, the curve remains above the value 50 for angles α between approximately 69° and 97°, thus defining a full width at half maximum (FWHM) of 28° distributed around each emission peak. This orientation of the emission peak allows, when the light source is installed in the module of the invention, for a significant portion of the luminous flux it emits to be directed towards the partitions 21 of the cavity 20.

[0049] It is also noted that the curve remains at a low value, less than 20, over an angular range from approximately -53° to +53°.

[0050] It is advantageous to have a low light intensity value near the X mounting axis. Indeed, when the source 10 is positioned opposite a cavity 20 of the module according to the invention, the X mounting axis is substantially parallel to the body of the cavity 20, that is to say, to the average direction connecting the first aperture 31 and the second aperture 32. Thus, only a small number of light rays go directly from the light source 10 to the second aperture without impacting the partitions 21 of the cavity 20. This avoids a light spot effect in the pixel at the position of the light source 10.

[0051] Of course other emission diagram shapes are possible for a radial emission source, provided that little light is emitted near the X mounting axis, and that a significant part of the flux is oriented laterally so as to impact the partitions 21.

[0052] Thus, the emission peak can be obtained for a different angle value, αpic+, αpic-. Angle values ​​αpic greater than or equal to 45° are well-suited to ensure that a significant portion of the flux is directed towards the cavity walls. Furthermore, it is advantageous for the emission peak angle αpic to be less than 90°. Indeed, higher values ​​would cause a significant portion of the light to escape backward and not enter the cavity associated with the light source.

[0053] Furthermore, it is important that the emission pattern exhibits low values, specifically values ​​less than or equal to 20, up to an angle α of 30°. Thus, when the light source is installed in the module of the invention, only a small portion of the luminous flux it emits is directed directly towards the second aperture without impacting the partitions 21 of the cavity 20, thereby preventing the creation of a bright spot, i.e., an area of ​​excessive light intensity, towards the center of the pixel. The overall homogeneity of the pixel is thereby improved.

[0054] The full width at half maximum (FWHM) can also take on values ​​other than those indicated above. It can be more or less narrow, and distributed symmetrically or asymmetrically around the emission peak.

[0055] It is advantageous that it be such that, when the light source is installed in the module of the invention, the angular sector it covers is oriented towards the partitions 21. Thus, the width at half height can be variable, in particular as a function of the angle αpic of the emission peak.

[0056] When the said angle αpic is such that the remission peak is oriented towards one end of the partition 21, that is to say near the first or second opening, it is advantageous for the width at half maximum to be less than or equal to 30°. This is notably the case for αpic between 75 and 90°, or between 45 and 55°.

[0057] Conversely, when the peak angle α is such that the emission peak is directed towards the middle of partition 21, i.e., at a distance from the first or second opening, the full width at half maximum (FWHM) can take on higher values. However, it is advantageous for it to remain less than or equal to 60° to ensure that all the light emission within this angular sector is directed towards partition 21. This situation is notably achieved for peak angles α between 55° and 75°, and more specifically between 60° and 70°.

[0058] Furthermore, when the said peak angle α is such that the emission peak is directed towards one end of the partition 21, it is advantageous for the full width at half maximum (FWHM) to be asymmetrical around the emission peak, in order to limit the amount of light emitted in a direction not oriented towards said partition 21. More specifically, if the peak angle α is high, particularly between 75 and 90°, it is advantageous for the angular difference between the emission peak and the FWHM value to be smaller for the FWHM angle greater than αpic than for the FWHM angle less than αpic. This prevents too much light flux from being sent beyond the partition 21 on the side of the first opening. This is the case for the configuration shown in the [ Fig. 5b The angle αpic is approximately 85°. The width at half maximum is 97°-85°=12° for the angular part above αpic, and 85°-69°=16° for the angular part below αpic.

[0059] Conversely, if the peak angle α is small, particularly between 45 and 55°, it is advantageous for the angular difference between the emission peak and the full height value to be smaller for the full height angle below αpic than for the full height angle above αpic. This prevents too much light from being sent beyond partition 21 on the side of the second opening.

[0060] In another embodiment, the emission from the light source does not exhibit rotational symmetry. However, the characteristics described above for rotationally symmetric emission are also applicable, and are to be understood within a given radial plane containing the mounting axis X, and which may vary from one radial plane to another. Within said radial plane, the characteristics may also differ between positive and negative angle values ​​α.

[0061] It should be noted in particular that it is advantageous for the value of the angle αpic to be higher in a direction corresponding to a partition 21 closer to the light source, and lower in a direction corresponding to a partition 21 further from the light source. The terms "close" and "far" are to be understood here relative to each other.

Claims

1. A motor-vehicle light-emitting module (1, 201, 301, 401) comprising: a. - a plurality of light sources (10, 210, 310, 410) configured to emit light rays (R); b. - a plurality of cavities (20, 220, 220', 320, 320', 420, 420') each having a first aperture (31, 231, 331, 431) and a second aperture (32, 232, 332, 432) opposite the first aperture (31, 231, 331, 431), each light source (10, 210, 310, 410) being associated with one cavity (20, 220, 220', 320, 320', 420, 420'), so that at least part of the light rays (R) emitted by each light source (10, 210, 310, 410) enters via the first aperture (31, 231, 331, 431) of the associated cavity (20, 220, 220', 320, 320', 420, 420') and exits said associated cavity (20, 220, 220', 320, 320', 420, 420') via the second aperture (32, 232, 332, 432); c. - the motor-vehicle light-emitting module being characterized in that the light sources (10, 210, 310, 410) emitting radially, and in that the cavities (20, 220, 220', 320, 320', 420, 420') are formed by partitions (21, 221, 321, 421) the shape of which, in longitudinal cross section, is that of two opposite trapezoids the large bases of which are common, and wherein the light sources (10, 210, 310, 410) have an emission peak oriented toward the partitions (21, 221, 321, 421) of said associated cavity (20, 220, 220', 320, 320', 420, 420')2. The light-emitting module (1, 201, 301, 401) as claimed in claim 1, wherein the light-emitting module comprises a perforated mask (40, 240, 340, 440) located at a distance from the plurality of light sources (10, 210, 310, 410) in a direction of propagation S of the light, the perforated mask (40, 240, 340, 440) comprising a grid (41, 241, 341, 441) forming a plurality of light-emitting cells (42, 242, 342, 442) facing the cavities (20, 220, 220', 320, 320', 420, 420') and the associated light sources (10, 210, 310, 410), each light-emitting cell (42, 242, 342, 442) being separate from a directly adjacent light-emitting cell (42, 242, 342, 442).

3. The light-emitting module (1, 201, 301, 401) as claimed in claim 2, wherein the light-emitting module comprises a mask carrier (50, 250, 350, 450) placed facing the second apertures, so that it is passed through by the light rays (R), and bearing the perforated mask (40, 240, 340, 440).

4. The light-emitting module (1, 201, 301, 401) as claimed in claim 3, wherein the mask carrier (50, 250, 350, 450) is a diffuser.

5. The light-emitting module (1, 201, 301, 401) as claimed in any one of claims 3 to 4, wherein the perforated mask (40, 240, 340, 440) is integrally formed with the mask carrier (50, 250, 350, 450), the perforated mask (40, 240, 340, 440) and the mask carrier (50, 250, 350, 450) in particular being obtained by bi-injection molding of plastics.

6. The light-emitting module (1, 201, 301, 401) as claimed in any one of claims 3 to 4, wherein the perforated mask (40, 240, 340, 440) is attached to the mask carrier (50, 250, 350, 450), the perforated mask (40, 240, 340, 440) being securely fastened to the carrier by fastening means.

7. The light-emitting module (1, 201, 301, 401) as claimed in any one of claims 3 to 4, wherein the perforated mask (40, 240, 340, 440) is deposited on the mask carrier (50, 250, 350, 450), the grid (41, 241, 341, 441) of the perforated mask (40, 240, 340, 440) being formed by a layer of an opaque material deposited on a face of the perforated mask (40, 240, 340, 440).

8. The light-emitting module (1, 201, 301, 401) as claimed in any one of the preceding claims, wherein the cavities (20, 220, 220', 320, 320', 420, 420') are formed by partitions (21, 221, 321, 421) of light color, and in particular of white color.

9. The light-emitting module (1, 201, 301, 401) as claimed in one of the preceding claims, wherein the cavities (20, 220, 220', 320, 320', 420, 420') are formed by partitions (21, 221, 321, 421) that have at least one textured wall in order to scatter light rays (R) that strike them.

10. The light-emitting module (201, 301, 401) as claimed in any one of the preceding claims, wherein some partitions (221, 321, 421) are composed of a superposition of a plurality of sub-partitions (221a, 221a', 221b', 321a, 321b', 321b", 421a, 421b', 421b").

11. The light-emitting module (1, 201, 301, 401) as claimed in any one of the preceding claims, wherein the light sources (10, 210, 310, 410) comprise one or more radially emitting light-emitting diodes.

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