Optical module for a light emitting device of a motor vehicle

Abstract

The invention relates to an optical module (1) for collimating a light beam delivered by a light source (2) located on a base (10) of the optical module (1) and along an optical axis (01), the optical module comprising: a first optical surface configured to deflect light rays (R1, R2, R3, R4) delivered by the light source (2); a second optical surface (12) for deflecting light rays (R1, R2) delivered by the first optical surface; a light guide (17) parallel to the optical axis (01) and connecting the first optical surface to the second optical surface (12). The light guide (17) comprises an opening between the first optical surface and the second optical surface (12) forming a void (100) in the light guide (17) and comprising a third optical surface and a fourth optical surface (14) forming collimating means for propagating light rays (R1, R2) through the light guide (17).

Description

[0001] The technical background of this invention is the technical background of light-emitting and signal-emitting devices for motor vehicles. More specifically, this invention relates to an optical module for a light-emitting device for motor vehicles.

[0002] In the prior art, it is known to use luminous signaling devices (such as turn signals) in motor vehicles to ensure good visibility to other drivers. Such luminous devices are harmoniously integrated into the vehicle's outline and contribute to its luminous characteristics. The luminous characteristics of a motor vehicle can be defined as a specific arrangement of illuminated areas that give the vehicle its original aesthetic appearance and / or allow for quick and intuitive identification of the vehicle model or brand. The luminous device thus includes a set of light sources arranged in a rather complex shape, typically consisting of curved forms, through which light is emitted.

[0003] Such luminescent devices must emit light in a specific direction to appropriately warn other users of the presence of a motor vehicle and / or its intent in order to comply with applicable national regulations. For this purpose, known luminescent devices can incorporate optical modules capable of collimating the beam.

[0004] Document FR 3045781 A1 is particularly known, disclosing an example of such an optical module. The collimation of a light beam involves modifying the diverging beam emitted by a light source so that its rays are parallel to each other. This transformation of the beam requires the use of precisely positioned optical surfaces. Therefore, the assembly of these optical surfaces is particularly complex. This assembly is even more complex when the light-emitting device includes multiple light sources arranged along curved surfaces or lines. Consequently, known prior art light-emitting devices are generally complex to assemble and / or do not comply with the most stringent automotive regulations.

[0005] One object of the present invention is to provide a novel optical module that at least partially solves the aforementioned problems and provides other advantages.

[0006] Another objective of this invention is to simplify the optical coupling between such an optical module and the associated light source.

[0007] Another object of the present invention is to provide an optical module that is compact enough to allow use in a matrix array and to produce optimal collimation of light generated by a light source.

[0008] According to a first aspect of the invention, at least one of the above-mentioned objectives is achieved by an optical module for a light-emitting device for a motor vehicle, the optical module being configured to collimate along an optical axis a light beam generated by a light source located at the base of the optical module, the optical module comprising: - A first optical surface, which is configured to deflect a first light ray emitted by a light source and propagating through the air between the first optical surface and the second optical surface; - A second optical surface configured to deflect light emitted from the first optical surface; - An optical guide that extends parallel to the optical axis and connects a first optical surface to a second optical surface.

[0009] According to the present invention, the light guide includes a gap located between a first optical surface and a second optical surface, the gap being formed in the light guide and defined by a third optical surface near the first optical surface and a fourth optical surface near the second optical surface, the third optical surface and / or the fourth optical surface being configured to distribute a second ray that propagates through the light guide in a direction opposite to that of the first optical surface.

[0010] Advantageously, the third and / or fourth optical surfaces are configured to distribute the second light rays uniformly or substantially uniformly through the light guide in a direction opposite to that of the first optical surface.

[0011] "Collimation" means that collimated light rays are generally parallel to each other, but there may be angular deviations, particularly related to the size of the light source. "Partial collimation" means that collimation occurs in such a way that all light rays are in a given plane, allowing the aforementioned angular deviations relative to said plane, but in said plane, the light rays may have different directions.

[0012] According to a non-limiting embodiment, the base forms the bottom portion of the optical module, adjacent to a light source with which the optical module is intended to cooperate. Therefore, the base forms a surface for abutting against a circuit board supporting the light source, with which the optical module is intended to mate. This latter feature allows for precise positioning of the light source via optical components.

[0013] According to a non-limiting embodiment, a first optical surface forms a refractive interface for first rays from a light source with which the optical module is intended to cooperate. The first optical surface allows the first rays emitted by the light source to be uniformly distributed on a second optical surface. However, the first rays that diffuse beyond the first optical surface are not perfectly parallel to each other. Therefore, the first optical surface forms a material-air refractive interface such that the first rays from the light source propagate through the optical module to the first optical surface, and then, after passing through the first optical surface, subsequently propagate through the air in the direction of the second optical surface. "Uniformly distributed" means that the luminescence obtained on the surface to which the light reaches contains slight variations. In particular, considering that the extent of the convex region corresponds to one-tenth of the total area and is distributed throughout the entire region, the coefficient of variation of the average luminescence in each region is less than 3 across all regions.

[0014] According to a non-limiting embodiment, the second optical surface forms a refractive interface for a first ray originating from the first optical surface and propagating through the air between the first and second optical surfaces. The second optical surface allows for partial collimation, i.e., the first ray from the second optical surface diverges less than the first ray from the first optical surface. Specifically, the first ray that has diffused beyond the second optical surface is now partially collimated. Therefore, the second optical surface forms an air-matter refractive interface such that the first ray from the first optical surface reaches the second optical surface by propagating through the air, and then, after passing through the second optical surface, subsequently propagates through the optical module in the direction of the exit surface of the optical module. The exit surface is close to the second optical surface.

[0015] The combination of the first and second optical surfaces allows the first rays generated by the light source that the optical module is intended to associate with to be distributed relatively uniformly, and makes them all parallel or substantially parallel to a first collimation direction perpendicular to the optical axis of the optical module, i.e., extending along the width of the optical module.

[0016] According to a non-limiting embodiment, a light guide connects the first optical surface and the second optical surface. This advantageous configuration allows for precise control of the relative position and orientation of the first and second optical surfaces, thereby enabling high optical accuracy and qualitative collimation of the first ray generated by a light source with which the optical module is intended to cooperate.

[0017] According to a non-limiting embodiment, a gap forms an aperture within the light guide, defined on one side of a first optical surface by a third optical surface and on one side of a second optical surface by a fourth optical surface. The gap cleverly allows for the provision of two additional refractive interfaces within the light guide to collimate the propagation of a second ray through it. For this purpose, the gap thus allows the third and fourth optical surfaces to be positioned along the length of the light guide. The gap extends along the optical axis and across the width of the optical module.

[0018] According to a non-limiting embodiment, the third optical surface forms a refractive interface for the second light rays emitted by the light source and propagating through the light guide. The third optical surface allows for partial collimation of the second light rays emitted by the light source, i.e., the second light rays from the third optical surface diverge less than those emitted by the light source. However, the second light rays that diffuse beyond the third optical surface are not perfectly parallel to each other. Therefore, the third optical surface forms a material-air refractive interface such that the second light rays from the light source reach the third optical surface by propagating through the light guide, and then, after passing through the third optical surface, subsequently propagate through the air in the direction of the fourth optical surface.

[0019] According to a non-limiting embodiment, the fourth optical surface forms a refractive interface for the second light rays from the third optical surface. The fourth optical surface enables collimation complementary to that achieved by the third optical surface, i.e., the second light rays from the fourth optical surface diverge less than those from the third optical surface. Specifically, the second light rays that have diffused beyond the fourth optical surface are now perfectly parallel or nearly parallel to each other. Therefore, the fourth optical surface forms an air-matter refractive interface such that the second light rays from the third optical surface propagate through the air to the fourth optical surface, and then, after passing through the fourth optical surface, subsequently propagate again through the light guide in the direction of the exit surface of the optical module.

[0020] The combination of the third and fourth optical surfaces allows a second ray generated by a light source associated with the optical module and propagating through the light guide to be relatively uniformly distributed in a first collimation direction perpendicular to the optical axis of the optical module (i.e., across the width of the optical module). Advantageously, when the second ray propagates through the light guide, the first and second optical surfaces enable the first ray emitted by the light source to be partially collimated in the same partially collimation direction as the third and fourth optical surfaces.

[0021] Therefore, the present invention enables the shaping of light emitted by a light source intended to cooperate with an optical module according to the invention. Depending on the propagation direction of the light emitted from the light source and entering the optical module near its base, the light interacts with certain surfaces of the optical module and / or certain surfaces of the aforementioned optical surfaces. In particular, for clarity and understanding of how the invention works, light propagating through the optical module according to the invention is distinguished between the following: - A first ray of light, propagating through the optical module via ambient air separating the base from the plate, first passes through a first optical surface and then through a second optical surface. The first ray of light is distributed at the second optical surface and is collimated or substantially collimated in a plane formed by the optical axis and width of the optical module according to the invention (i.e., in the first direction within the meaning of the invention). - A second ray propagating through the optical guide in the optical module first passes through the third optical surface and then through the fourth optical surface. The second ray propagates upstream of the third optical surface through the optical guide, then into the ambient air between the third and fourth optical surfaces, and then propagates again through the optical guide beyond the fourth optical surface. Beyond the fourth optical surface, the second ray is distributed and collimated or substantially collimated in a plane formed by the optical axis and width of the optical module according to the invention (i.e., in the first direction within the meaning of the invention). - A third ray propagates through the light guide but not through the gap. The third ray propagates in the direction of the top surface of the optical module via total internal reflection on the side walls of the light guide. For this purpose, the parabolic shape of the light guide advantageously allows the third ray to be shaped so as to orient the third ray in a direction parallel to or substantially parallel to the first and second rays; - Avoid the fourth rays that are shaped as described above. These fourth rays propagate through the light guide in the direction between the gap and the side surface of the light guide, so that the fourth rays do not encounter enough optical surface to allow them to be corrected in the intended direction. The amount of these fourth rays can be limited by widening the gap relative to the first direction (i.e., by increasing the width of the gap), or by elongating the side surface of the light guide along the optical axis to intercept the fourth rays.

[0022] Therefore, the optical module according to the first aspect of the invention solves the technical problem because it improves the overall collimation of light emitted by a light source with which the optical module is intended to cooperate. More specifically, the optical module improves the collimation of light propagating through the light guide.

[0023] The optical module according to the first aspect of the invention advantageously includes at least one of the following improvements, and the technical features forming these improvements can be implemented individually or in combination: - The gap is a through-hole. Specifically, the gap is a through-hole formed in the light guide, the through-hole having a minimum dimension that passes through the light guide in a direction perpendicular to the optical axis and across the optical axis; The light guide, the first optical surface, and the second optical surface are integral and made of the same material, forming a single unit. In the context of this invention, "integral and made of the same material" means that the light guide, the first optical surface, and the second optical surface are manufactured in the same process and cannot be separated from each other unless one and / or the other is wholly or partially damaged or destroyed. This advantageous configuration allows for reduced manufacturing costs and simplifies subsequent integration of such optical modules. - The light guide has a small thickness relative to its length and width. Here, the thickness is considered to correspond to the minimum dimension of the light guide measured in a direction perpendicular to the optical axis and perpendicular to the width of the optical module. The length of the light guide is measured parallel to the optical axis, and the width is measured perpendicular to both the length and thickness. "Small" means that the thickness is at most equal to one-quarter of the length of the light guide. In particular, the thickness of the light guide measured perpendicular to the optical axis is between 1 mm and 3 mm, preferably equal to 2 mm. Apart from the portion of the light guide including the gap, the light guide has a profile that can be rectangular or open. The light guide has two opposing faces that are parallel to each other in a direction parallel to the thickness of the light guide. In a direction parallel to the width of the optical module, i.e., in the sense of the invention, a first direction perpendicular to both the thickness and the optical axis, the light guide has two opposing faces that can be parallel to each other or preferably inclined relative to each other to facilitate internal reflection of second light rays propagating through the light guide. Particularly advantageously, the lateral surfaces are parabolic, meaning each of these lateral surfaces forms a parabolic segment, or a cylindrical parabolic segment, i.e., each forms a cylindrical surface with a parabolic profile or directrix. In other words, these surfaces of the light guide form guiding surfaces that define the propagation area of ​​the second ray through total internal reflection from these surfaces and within the light guide. This advantageous configuration allows the third ray propagating through the light guide to be parallel or substantially parallel, without interacting with the gaps and the third and fourth optical surfaces; - In the direction parallel to the optical axis, the size of the light guide measured at the first optical surface is smaller than the size of the light guide measured at the second optical surface. In other words, in the direction parallel to the optical axis, the light guide has an open shape in the direction of the second optical surface, and more particularly a parabolic shape, so as to allow a third ray propagating through the light guide to be parallel to or substantially parallel to the optical axis. This advantageous configuration also allows for an increase in the uniformity of the distribution of the third ray near the second optical surface. Therefore, this advantageous configuration allows for the limitation of hot spots that may exist in the collimated beam generated by the optical module. In particular, at the first optical surface, the width of the light guide is between 9 mm and 11 mm, preferably equal to 10 mm. Supplementally or alternatively, at the second optical surface, the width of the light guide is between 20 mm and 30 mm, preferably equal to 25 mm; - The optical module includes: (i) a first portion in the shape of a cylindrical segment, with a first optical surface associated with the first portion, and (ii) A second portion in the shape of a plate, wherein the first portion is connected to the second portion via a light guide, and a second optical surface is associated with the second portion.

[0024] A first portion supports a first optical surface configured to deflect certain rays, particularly the first ray, of light emitted by a light source intended to be associated with the optical module. A second portion supports a second optical surface configured to deflect the first ray emitted from the first optical surface. Thus, the second portion is positioned downstream of the first portion in the direction of light propagation through the optical module. Consequently, the cylindrical section forming the first portion defines a hollow recess within the cylindrical section in which the light source is intended to be placed. This advantageous configuration allows light generated by the light source to be efficiently injected into the optical module through the cylindrical section. A plate forming the second portion is located at a distance from the first portion and forms the exit surface of the optical module. This plate is advantageously planar and preferably located in a plane perpendicular to the optical axis of the optical module. A first optical surface includes a first set of prisms extending parallel to a first axis perpendicular to the optical axis, and a second optical surface includes a second set of prisms extending parallel to a second axis perpendicular to the optical axis. The first optical surface forms a Fresnel surface to distribute a first ray emitted by a light source onto the second surface, particularly in the collimation direction, while limiting the volume of the optical module according to the invention. The collimation direction is advantageously chosen to span the width of the optical module. The prisms forming the first optical surface may have a shape and / or size that varies according to their distance from the optical axis to produce a deflection tailored to the angle of incidence of the first ray on the first optical surface. Similarly, the second optical surface forms a Fresnel surface to partially collimate the first ray from the first optical surface in the collimation direction, while limiting the volume of the optical module according to the invention. The partially collimated direction is advantageously chosen to span the width of the optical module. The prisms forming the second optical surface may have a shape and / or size that varies according to their distance from the optical axis to produce a deflection tailored to the angle of incidence of the first ray on the second optical surface; - The first axis associated with the first optical surface and the second axis associated with the second optical surface are advantageously parallel. The first and second axes are advantageously chosen to span the thickness of the optical module; - The third and / or fourth optical surfaces each comprise a third and / or fourth set of prisms, extending parallel to a third and / or fourth axis, both perpendicular to the optical axis. The third optical surface forms a Fresnel surface to partially collimate a second ray emitted by the light source and propagating through the light guide in the collimation direction, while limiting the volume of the optical module according to the invention. The direction of partial collimation is advantageously chosen to span the width of the optical module. The prisms forming the third optical surface may have shapes and / or dimensions varying according to their distance from the optical axis to produce a deflection tailored to the angle of incidence of the second ray on the third optical surface. Similarly, the fourth optical surface forms a Fresnel surface to partially collimate a second ray from the third optical surface in the collimation direction, while limiting the volume of the optical module according to the invention. The direction of partial collimation is advantageously chosen to span the width of the optical module. The prism forming the fourth optical surface can have a shape and / or size that varies according to its distance from the optical axis in order to produce a deflection tailored to the angle of incidence of the second ray on the fourth optical surface. When both the third and fourth surfaces include prisms, it is the combination of these prisms that ensures partial collimation of the second ray. When only one of the third and fourth surfaces includes a prism, the other surface is smooth and advantageously planar. - The third axis is parallel to the fourth axis; - The third axis is parallel to the first axis. In particular, the third and fourth axes are advantageously chosen to span the thickness of the optical module; - The width of the gap is the same as the width of the cylindrical segment forming the first part of the optical module. The width of the gap is measured in the same direction as the width of the light guide, as defined above. The width of the cylindrical segment is measured in the same direction. This advantageous configuration allows for the capture of the maximum amount of second light rays propagating through the light guide, so as to partially collimate the second light rays and distribute them spatially; - The gap is centered relative to the cylindrical section forming the first part of the optical module. In other words, both the gap and the cylindrical section are aligned and centered relative to the optical axis of the optical module according to the invention. Additionally, both the gap and the cylindrical section have the same plane of symmetry, which is parallel to the optical axis of the optical module according to the invention. - The optical module includes a fifth optical surface configured to correct all light emitted by the light source in a fifth direction perpendicular to the first direction. For this purpose, the fifth optical surface includes a fifth set of protrusions and concave portions extending along the inner surface of the cylindrical section, perpendicular to the prism forming the first optical surface. The fifth optical surface is formed by a set of arcuate lines centered on the same axis perpendicular to the optical axis. The elongation direction of the lines forming the fifth optical surface is advantageously chosen to span the width of the optical module so that light passing through it is at least partially collimated in a direction parallel to the thickness of the optical module. These different arcuate lines have different radii to form a Fresnel prism. Therefore, the fifth optical surface also forms a Fresnel surface. The fifth optical surface is associated with a first portion of the cylindrical section shape of the optical module. In particular, the fifth optical surface is close to the light source. The fifth optical surface is the first refractive interface through which all light emitted by the light source and interacting with the optical module according to the invention passes; Finally, the optical module may further include a sixth optical surface configured to correct and / or diffuse light rays emanating from the second optical surface or from the light guide. The sixth optical surface forms the top surface of the plate, which forms the exit surface of the optical module. The sixth optical surface extends parallel to the second optical surface. Specifically, the sixth optical surface is disposed on the outer side of the second portion opposite to the surface on which the second optical surface is disposed. The sixth optical surface may, for example, have a corrugated shape perpendicular to the optical axis and a specific cross-sectional profile. The sixth optical surface allows light rays passing through it (i.e., at least the first, second, and third rays) to be at least partially collimated in a direction parallel to the width of the optical module. For this purpose, the sixth optical surface forms a Fresnel surface so that the first, second, and third rays from the bottom portion of the optical module are partially collimated in the collimation direction, while limiting the volume of the optical module according to the invention. The direction of partial collimation is advantageously chosen to span the width of the optical module. The prism forming the sixth optical surface may have a shape and / or size that varies according to its distance from the optical axis in order to produce a deflection tailored to the angle of incidence of the first, second, and third rays on the sixth optical surface.

[0025] According to a second aspect of the present invention, a light-emitting device for a motor vehicle is provided, the light-emitting device comprising: - Load-bearing components; - At least one light source, which is fastened to the carrier; - At least one optical module according to the first aspect of the invention or any improvement thereof, the base of each optical module being in contact with the carrier on either side of one of the at least one light source.

[0026] Specifically, each light source is optically coupled to one of the at least one optical modules, and particularly coupled to its first portion, i.e., specifically coupled to its fifth optical surface. “Optically coupled” means that the light generated by the light source is injected dominantly or even exclusively into the optical module associated with the light source.

[0027] According to a non-limiting embodiment, the carrier can be of any type in terms of its properties, shape, size, and / or material. In particular, the carrier may include a circuit board associated with the at least one light source.

[0028] According to a non-limiting embodiment, the light source is of the type comprising one or more light-emitting diodes (LEDs). LED means any type of light-emitting diode, such as conventional LEDs, organic LEDs (OLEDs), active-matrix organic LEDs (AMOLEDs), or flexible OLEDs (FOLEDs). Advantageously, the light sources are selectively driven by a control unit that regulates the current supplied to each of the light sources to control their light emission. Thus, the light sources can be selectively driven to configure them to any configuration between an off configuration and a configuration that produces maximum light emission.

[0029] According to a non-limiting embodiment, the light-emitting device is, for example, a headlight and / or a signal light and / or a daytime running light.

[0030] Various embodiments of the invention are provided, which combine the various optional features described herein in all possible combinations.

[0031] On the one hand, other features and advantages of the invention will become clearer from the following description, and on the other hand, from the numerous non-limiting examples of embodiments given in an indicative manner with reference to the accompanying illustrative drawings, in which: [ Figure 1 A three-dimensional view of an optical module according to a first aspect of the present invention is shown; [ Figure 2 [Shown] Figure 1 A cross-sectional view of the optical module shown.

[0032] Of course, the features, variations, and various forms of embodiments of the present invention can be associated with each other in various combinations, as long as they are compatible or non-exclusive. In particular, it is conceivable that variations of the present invention may include only the features selected below independently of the other features described, provided that such selection of features is sufficient to provide a technical advantage or to distinguish the present invention from the prior art.

[0033] In particular, if there is nothing from a technical point of view that prevents the combination of all the described variations and all the embodiments, then they can be combined with each other.

[0034] In the accompanying drawings, elements common to several drawings retain the same reference numerals.

[0035] refer to Figure 1 and Figure 2 The present invention provides an optical module 1 for a light-emitting device of a motor vehicle. The optical module 1 is configured to collimate along the optical axis O1 with a light beam generated by a light source 2 located on the base 10 of the optical module 1. The optical module 1 includes: - A first optical surface 11, which is configured to deflect a first ray R1 emitted by the light source 2; - A second optical surface 12, which is configured to deflect a first ray R1 emitted from a first optical surface 11, the first ray R1 propagating through the air between the first optical surface 11 and the second optical surface 12; - A light guide 17 extends parallel to the optical axis O1 and connects the first optical surface 11 to the second optical surface 12. Only the second ray R2 and the third ray R3 emitted by the light source 2 propagate through the light guide 17, and the ray R4 may propagate through the light guide.

[0036] The second ray R2 and the third ray R3 propagate from the portion near the base 10 through the light guide 17 to the portion near the second optical surface 12, for example, via total internal reflection in the light guide 17 or via refraction at certain specific surfaces, as will be described below.

[0037] In the accompanying drawings, light rays R1, R2, R3, and R4 emitted by a light source 2 designed to cooperate with an optical module 1 according to the invention are indicated by dashed lines.

[0038] Typically, the base 10 forms the bottom portion of the optical module 1 near the light source 2, the optical module 1 being designed to cooperate with the light source. The base 10 takes the form of a generally rectangular plate. The base may include multiple segments, each advantageously taking the form of a generally rectangular plate. The base 10 is primarily planar to form a surface for contact and fastening against a carrier (not shown) that includes the light-emitting device comprising the optical module 1. The base 10 can be fastened to the carrier by any suitable means. The carrier is, for example, a circuit board on which the light source 2 is mounted.

[0039] The light-emitting device is more specifically a type of signaling device for motor vehicles: the light-emitting device is designed to emit light rays R1, R2, R3, R4 generated by a light source 2 and shaped by an optical module 1 according to the invention, so as to make the motor vehicle clearly visible to other road users. The light-emitting device can be arranged at the front or rear of the motor vehicle. For this purpose, such a light-emitting device includes a plurality of optical modules 1 according to the invention, each optical module 1 being associated with a light source 2 such that light rays R1, R2, R3, R4 generated by the light source 2 are injected into the optical module 1. Each optical module 1 is associated with one or more light sources 2. However, each light source 2 is associated with only one optical module 1. Therefore, each optical module 1 is designed to receive light rays R1, R2, R3, R4 emitted by the light source 2 associated with it. A given light ray R1, R2, R3, R4 cannot pass through two different optical modules 1.

[0040] Therefore, the optical modules 1 are distinct and adjacent to each other, and they may be in direct contact. The optical modules 1 are positioned next to each other along a line, which can be of any shape, such as an arc, or more generally a convex shape. This advantageous configuration allows for the definition of complex geometries that enable the development of a wide variety of luminous features for motor vehicles: the exit surfaces of the optical modules 1 (positioned opposite to the light source 2) thus form an outer surface visible from the outside of the motor vehicle. Alternatively, these optical modules 1 are integrated into a luminous device placed behind a diffuser, which is specifically configured to mask the gap between two adjacent optical modules 1. In the context of this invention, the diffuser screen is a screen formed of a diffuse and / or surface finish that allows light to diffuse, such as granulation on one or both of its main surfaces, which are those surfaces configured to be through which light from one or more optical modules 1 passes.

[0041] Typically, the surface formed by the exit surface of the optical module 1 can extend in three dimensions and have one or more different curvatures in order to produce the desired stylized effect on a motor vehicle.

[0042] According to the present invention, the light guide 17 of the optical module 1 includes a gap 100 located between a first optical surface 11 and a second optical surface 12, the gap 100 being formed and located within the light guide 17. The gap 100 is a through-hole. The gap 100 is defined by a third optical surface 13 near the first optical surface 11 and a fourth optical surface 14 near the second optical surface 12. The third optical surface 13 and / or the fourth optical surface 14 are configured such that a second ray R2 propagating through the light guide 17 is uniformly or substantially uniformly distributed in the direction of the second optical surface 12 and relative to a direction parallel to the width of the optical module 1. In other words, the third optical surface 13 and the fourth optical surface 14, each located on one side of the gap 100 relative to the optical axis O1, allow the second ray R2 propagating through the light guide 17 to be deflected such that beyond the fourth optical surface 14, the second ray R2 is more parallel to the optical axis O1 than before the third optical surface 13.

[0043] Therefore, according to the present invention, the light rays R2, R3, and R4 propagating through the optical guide are shaped in such a way that they are spatially distributed and oriented relative to the optical axis O1: - Through total internal reflection on the two lateral surfaces 171 of the light guide 17, such as Figure 2 The third ray R3 is schematically shown in the diagram; - Or through the action of the third optical surface 13 and the fourth optical surface 14, such as Figure 2 The second ray R2 is schematically shown in the diagram; - Or by direct propagation through the light guide 17, from the bottom portion of the light guide to the top portion of the light guide, such as... Figure 2 The fourth ray R4 is represented by this. Specifically, the fourth ray R4 avoids the correction generated by the optical module 1 because it does not interact with the gap 100 and its third optical surface 13 and fourth optical surface 14, nor with the lateral surface 171 of the light guide 17. The presence of these fourth rays R4 can be limited by further enlarging the gap 100 and the third optical surface 13 and fourth optical surface 14, or by increasing the size of the optical module 1 along the optical axis O1 so that the lateral surface 171 intercepts any fourth rays R4 that would otherwise propagate through the light guide 17 between the gap 100 and the lateral surface 171.

[0044] A gap 100 is provided in the light guide 17 to form a through aperture along at least one axis perpendicular to the optical axis O1 of the optical module 1. Therefore, the second ray R3 propagating through the light guide 17 now passes through two new refractive interfaces (the third optical surface 13 and the fourth optical surface 14), which allows the second ray to be deflected from its incident orientation on the third optical surface 13 by refraction and / or by transmission.

[0045] The optical guide 17 of the optical module 1 according to the present invention has a constant thickness in the direction perpendicular to the optical axis O1. Specifically, the thickness of the optical guide 17 is between 1 mm and 3 mm, preferably equal to 2 mm. For example, in... Figure 1 and Figure 2 As can be seen, in the direction parallel to the optical axis O1, the light guide 17 has an open shape in the direction of the second optical surface 12, such that, as in Figure 2 As can be seen, the lateral surface 171 allows the third ray R3 to be corrected by total internal reflection during its propagation through the optical guide 17, so that it is parallel to or substantially parallel to the optical axis O1. In other words, the optical guide 17 has a dimension measured at the first optical surface 11, which is smaller than the dimension measured at the second optical surface 12. This configuration is complementary to the gap 100 and its third optical surface 13 and fourth optical surface 14, allowing the second ray R2 passing through them to be uniformly distributed and parallel to or substantially parallel to the optical axis O1, and also allowing the third ray R3 emitted by the light source 2 to be parallel to the optical axis O1, avoiding the third optical surface 13 during its propagation through the optical guide 17, and encountering one of the lateral surfaces 171 during this propagation.

[0046] In a direction parallel to the optical axis O1, the light guide 17 protrudes from the base 10. Furthermore, in a direction perpendicular to the optical axis O1, the light guide 17 extends in the middle portion of the optical module 1, such that it is emitted only by the light source 2 and is located parallel to the optical axis O1. Figure 2 The second ray R2 and the third ray R3, which are in or near the plane of the light source 2, are transmitted through the light guide 17. In other words, the light rays emitted by the light source 2, parallel to the plane of the light source 17, are transmitted through the light guide 17. Figure 2 The second ray R2 and the third ray R3, located in the plane of the light guide 17 or in a slightly intersecting (i.e., tilted by a few degrees) plane, are injected into the light guide 17 taking into account its thickness. These rays then propagate therein via total internal reflection on the lateral surface 171 of the light guide 17, or propagate through the light guide 17 and the gap 100, as explained above. In contrast, rays tilted too much relative to this plane (i.e., located relative to...) Figure 2 The first ray R1 (in a plane tilted at a few degrees) diffuses around the optical module 1 and into the air between the first optical surface 11 and the second optical surface 12.

[0047] Therefore, the open and extended shape of the light guide 17 facing the light source 2 allows for the collection and correction of the third ray R3 in the direction of the optical axis O1, and allows for increased uniformity of the third ray distribution as it propagates through the light guide 17. Thus, this advantageous configuration makes it possible to limit any hot spots or shadows that may exist in the beam formed by the rays R1, R2, R3, and R4 emitted from the light source 2 by the optical module 1.

[0048] At the second optical surface 12, the optical module 1 takes the form of a planar plate 18, which advantageously extends parallel to the base 10. This configuration allows the optical module 10 to be symmetrical and thus allows light to be equally distributed laterally to each half. The plate 18 thus forms the exit surface of the optical module 1. The plate 18 is spaced apart from and directly opposite the base 10, such that a first ray R1 emitted by the light source 2 and not extending into the light guide 17 passes through the gap between the base 10 and the first optical surface 11, and through the plate 18 which is flush with the second optical surface 12, and through the air. The plate 18 advantageously has a rectangular shape so that it can be easily associated with the plate of another optical module 1 by proximity, thereby reducing the gap between two adjacent optical modules 1.

[0049] More specifically, in Figure 1 and Figure 2 In the example of the shown embodiment, optical module 1 includes: - A first portion 21, shaped like a cylindrical segment 19, is associated with a first optical surface 11. The first portion 21 supports the first optical surface 11, which is configured to deflect a first ray R1 emitted by a light source 2 associated with the optical module 1; and - A second portion 22, shaped like a plate 18, is connected to the first portion 21 via a light guide 17, and a second optical surface 12 is associated with the second portion 22. The second portion 22 supports the second optical surface 12, which is configured to deflect a first ray R1 emitted from the first optical surface 11. Therefore, the second portion 22 is positioned downstream of the first portion 21 in the direction in which rays R1, R2, R3, and R4 propagate through the optical module 1.

[0050] In this example embodiment, the cylindrical segment 19 forming the first portion 21 thus defines a hollow recess, into which the light source 2 associated with the optical module 1 is intended to be placed. This advantageous configuration allows the light rays R1, R2, R3, and R4 generated by the light source 2 to be efficiently injected into the optical module 1 through the cylindrical segment, both directed toward the light guide 17 in the case of the second ray R2 and the third ray R3, and toward the first optical surface 11 in the case of the first ray R1.

[0051] The plate 18 forming the second part 22 is located at a certain distance from the first part 21 and forms the exit surface of the optical module 1. The plate 18 is advantageously located in a plane perpendicular to the optical axis O1 of the optical module 1.

[0052] To deflect the light rays R1, R2, R3 passing through them, making them more uniform and parallel to the optical axis O1, each optical surface of the optical module 1 includes a set of prisms. Therefore, each optical surface forms a Fresnel surface to deflect the light rays R1, R2, R3 emitted by the light source 2 along the optical axis O1, while limiting the volume of the optical module 1 according to the invention. The prisms forming each optical surface can have dimensions varying according to their distance from the optical axis O1, in order to produce deflections tailored to the angle of incidence of the light rays R1, R2, R3 on the corresponding optical surface.

[0053] Of course, to optimize the alignment of rays R1, R2, R3 with the optical axis O1, the sets of prisms on each optical surface intersect to correct rays R1, R2, R3 in two different directions, which are preferably perpendicular or parallel to each other, in order to amplify the correction of rays R1, R2, R3 in a given direction. Therefore, the set of prisms associated with the first optical surface 11 extends parallel to a first axis perpendicular to the optical axis O1, and the set of prisms associated with the second optical surface 12 extends parallel to a second axis perpendicular to the optical axis O1. The first and second axes are advantageously parallel to each other and correspond to the thickness of the optical module 1.

[0054] Furthermore, the set of prisms associated with the third optical surface 13 extends parallel to the third axis perpendicular to the optical axis O1, and the set of prisms associated with the fourth optical surface 14 extends parallel to the fourth axis perpendicular to the optical axis O1. The third and fourth axes are advantageously parallel to each other. To increase the uniformity of light rays R1, R2, R3, and R4 at the plate 18 forming the exit surface of the optical module 1 (in the second part 22 of the optical module 1), the third and fourth axes are parallel to the first and second axes, respectively. Therefore, the first optical surface 11, the second optical surface 12, the third optical surface 13, and the fourth optical surface 14 are all configured to span the width of the optical module 1 (i.e., in...). Figure 2 In the plane shown, the corresponding rays R1, R2, and R3 are corrected.

[0055] Therefore, optical module 1, through its various optical surfaces 11 to 16, allows light rays R1, R2, R3 to be substantially parallel to each other and parallel to the optical axis O1. Thus, optical surfaces 11 to 16 transform a set of diverging light rays R1, R2, R3 at light source 2 into a beam of light rays R1, R2, R3 extending beyond the exit surface of optical module 1. These rays are parallel to each other and parallel to the optical axis O1, but are also uniformly distributed in a direction corresponding to the width of optical module 17. This transformation allows for the correction of light rays R1, R2, R3 so that they are redirected in a given direction parallel to the optical axis O1, and so that the vehicle is clearly visible to other road users, particularly at the angles required by current national regulations.

[0056] To further improve the alignment of the light rays R1, R2, R3, and R4 emitted by the light source 2, the optical module 1 also includes a fifth optical surface 15, which is configured to deflect all the light rays R1, R2, R3, and R4 emitted by the light source 2. The fifth optical surface 15 is positioned upstream of the first optical surface 11 in the propagation direction of the light rays R1, R2, R3, and R4 from the light source 2. The fifth optical surface 15 extends parallel to the first optical surface 11. Specifically, the fifth optical surface 15 extends on the inner surface of the cylindrical section 19 of the first portion 21 of the optical module 1, while the first optical surface 11 extends on the outer surface of the cylindrical section 19. Therefore, the fifth optical surface 15 is oriented towards the light source 2.

[0057] The fifth optical surface 15 is configured to correct all light rays R1, R2, R3, and R4 emitted by the light source 2 in a fifth direction perpendicular to the first direction. This fifth direction is parallel to the thickness of the optical module 17. In other words, the fifth optical surface 15 allows for correction of all light rays R1, R2, R3, and R4 emitted by the light source 2 in a fifth direction perpendicular to the first direction. Figure 2 The plane shown corrects the light rays R1, R2, R3, and R4. For this purpose, the fifth optical surface 15 includes a fifth set of irregularities extending along the inner surface of the cylindrical segment 19, perpendicular to the prism forming the first optical surface 11. The fifth optical surface 15 is formed by a set of arcuate lines centered on the same axis perpendicular to the optical axis O1. These different arcuate lines have different radii to form a Fresnel prism. Therefore, the fifth optical surface 15 also forms a Fresnel surface.

[0058] Finally, the optical module 1 may further include a sixth optical surface 16 configured to correct and / or diffuse all light rays R1, R2, R3, R4 emitted from the second optical surface 12 or from the light guide 17. The sixth optical surface 16 forms the top surface of the plate 18, which forms the exit surface of the optical module 1. The sixth optical surface 16 extends parallel to the second optical surface 12. Specifically, the sixth optical surface 16 is disposed on the outer surface of the second portion 22 opposite to the surface on which the second optical surface 12 is disposed. The sixth optical surface 16 may, for example, have a corrugated shape perpendicular to the optical axis O1 and a specific cross-sectional profile.

[0059] The optical module 1 according to the invention is rigid. The optical module is not intended to deform during the assembly of the light-emitting device or during its use. This optical module 1 can be made, for example, of a polymer transparent to the wavelengths R1, R2, R3, R4 emitted by the light source 2, particularly polycarbonate (PC) or polymethyl methacrylate (PMMA). Advantageously, the optical modules 1 of the light-emitting device all have the same shape, which facilitates the design, manufacture, and assembly of the light-emitting device by making it easier to bring two optical modules 1 close together. However, in the context of the invention, the light-emitting device can include optical modules 1 of various sizes, depending on the desired effect. Various sizes of light-emitting devices can also be manufactured very easily by simply changing the number of optical modules 1 they contain. By way of non-limiting example, the light-emitting device according to the invention includes, for example, a series of at least five optical modules 1 assembled in series and placed adjacent to each other, linearly or flexibly aligned, or even in a planar or flexural two-dimensional array. The optical modules 1 are advantageously manufactured using a plastic injection molding process in an injection mold, which allows for the mass production of the optical modules with excellent reproducibility.

[0060] In one embodiment, the flexible light-transmitting element 20 is placed around the outer periphery of the plate-shaped second segment 12 of the optical module 10, such as... Figure 3 As shown, a flexible light-transmitting element 20 is placed around the lateral surface of the plate-shaped second segment 12. During the assembly of multiple optical modules 10, the flexible light-transmitting element 20 on adjacent optical modules 10 can fill the space between the plate-shaped second segments 12. The size of the flexible light-transmitting element 20 can correspond to the spacing between two adjacent optical modules, i.e., about one to three millimeters. The flexible light-transmitting element 20 is preferably transparent or translucent, and light can pass through the segment of the flexible light-transmitting element 20 to illuminate the space between the plate-shaped second segments 11 of the optical modules 10, improving the overall illumination effect after assembly and ensuring the optical uniformity of the light-transmitting device with multiple optical modules 10 after assembly.

[0061] In one embodiment, the flexible light-transmitting element 20 is positioned transversely to the optical axis on one side of the plate-shaped second segment 12 of the optical module 10. During the assembly of multiple optical modules 10, the flexible light-transmitting element connects the light-emitting surfaces of adjacent optical modules 10 to achieve a uniform illumination effect. During the linear assembly of multiple optical modules 10, the flexible light-transmitting element 20 may be placed only on the side of the second segment 12 of the optical module 10 that contacts other optical modules 10, or it may be placed on all sides of the second segment 12. During the assembly of multiple optical modules 10 into an array, the flexible light-transmitting element is preferably placed on all sides of the second segment 12 of the optical module 10.

[0062] In one embodiment, the flexible light-transmitting element 20 is preferably made of transparent or semi-transparent TPU (thermoplastic polyurethane elastomer), which has good elasticity and strength as well as excellent optical properties. To ensure uniformity of illumination, a certain proportion of scattering material particles can be added to the flexible light-transmitting element 20 to diffuse the light.

[0063] In another embodiment, the flexible light-transmitting element 20 is made of silicone resin. Silicone resin has good properties in terms of light transmittance, such as high transparency and high transmittance, and has good flexibility that allows it to bend to any angle.

[0064] Optical microstructures (such as Fresnel surfaces, stepped surfaces, pits, or granules) can also be placed on the surface from which light exits the flexible light-transmitting element 20, in order to modify the direction of light passing through the flexible light-transmitting element, adjust the distribution of light, and improve the uniformity of the emitted light effect.

[0065] In one embodiment, the flexible light-transmitting element 20 can be formed from individual components. This design allows for flexible adaptation and design of the various parts of the flexible light-transmitting element as needed. The size and design of the flexible light-transmitting element can be easily adapted during assembly as required.

[0066] In other embodiments, such as Figure 4 As shown, the flexible light-transmitting element 20 can also be integrated into the optical module 10 via an overmolding process. This design facilitates the assembly of multiple optical modules 10 and saves costs.

[0067] In another embodiment, the light-emitting device includes a separate flexible element 3, such as Figure 5 As shown, the flexible element 3 includes a window in the plate-shaped second segment 11 for mounting optical modules 10, so as to connect multiple optical modules 10 together. In this embodiment, the flexible element 3 functions not only to flexibly fasten the optical modules 10, but also to modify the direction of light passing through the optical modules, that is, its function is to deflect the beam or increase the uniformity of the beam.

[0068] In one embodiment, such as Figure 6As shown, the plate-shaped second segment 12 of the optical module 10 has an asymmetrical structure, that is, the plate-shaped second segment 12 is asymmetrical with respect to the structure connecting the first segment 11 and the second segment 12. Specifically, the lateral edge of the surface of the second segment 12 closest to the connecting structure has a first protrusion, and the lateral edge opposite to the aforementioned lateral edge of the surface furthest from the connecting structure has a second protrusion, which extends in the opposite direction to the first protrusion. When multiple optical modules 10 are assembled, adjacent first and second protrusions overlap in the direction of the optical axis, which avoids dark areas caused by the space between adjacent optical modules 10 and improves the uniformity of the overall emitted light effect.

[0069] Of course, the present invention is not limited to the examples already described, and many modifications can be made to these examples without departing from the scope of the invention. In particular, the various features, forms, variations, and embodiments of the present invention can be combined with each other in various combinations, as long as they are compatible or non-exclusive to each other. In particular, all the variations and embodiments described above can be combined with each other.

Claims

1. An optical module (1) for a light-emitting device of a motor vehicle, the optical module (1) being configured to collimate along an optical axis (O1) a light beam generated by a light source (2) located at a base (10) of the optical module (1), the optical module (1) comprising: - A first optical surface (11) is configured to deflect a first ray (R1) emitted by the light source (2); - A second optical surface (12) is configured to deflect the first light ray (R1) emitted from the first optical surface (11) and propagating through the air between the first optical surface (11) and the second optical surface (12); - Light guide (17), which extends parallel to the optical axis (O1) and connects the first optical surface (11) to the second optical surface (12); The light guide (17) is characterized in that it includes a gap (100) located between the first optical surface (11) and the second optical surface (12), the gap (100) being formed in the light guide (17) and defined by a third optical surface (13) near the first optical surface (11) and a fourth optical surface (14) near the second optical surface (12), the third optical surface (13) and / or the fourth optical surface (14) being configured to distribute a second ray (R2), the second ray propagating through the light guide (17) in a direction opposite to that of the first optical surface (11).

2. The optical module (1) as described in the preceding claim, wherein, The thickness of the light guide (17) corresponds to the minimum dimension of the light guide (17) measured in a direction perpendicular to the optical axis (17), and the thickness is small relative to the length of the light guide (17) measured parallel to the optical axis (17) and relative to the width measured perpendicular to both the length and the thickness.

3. The optical module (1) as described in the preceding claim, wherein, In a direction parallel to the optical axis (O1), the light guide (17) has a shape that opens in the direction of the second optical surface (12), and the width of the light guide (17) measured at the first optical surface (11) is smaller than the width measured at the second optical surface (12).

4. The optical module (1) as described in any of the preceding claims, wherein, The optical module (1) includes: - A first portion (21) in the shape of a cylindrical segment (19), the first optical surface (11) being associated with the first portion (21); and - A second portion (22) in the shape of a plate (18), wherein the first portion (21) is connected to the second portion (22) via the light guide (17), and the second optical surface (12) is associated with the second portion (22).

5. The optical module (1) as described in any of the preceding claims, wherein, The first optical surface (11) includes a first set of prisms that extend parallel to a first axis perpendicular to the optical axis (O1), and the second optical surface (12) includes a second set of prisms that extend parallel to a second axis perpendicular to the optical axis (O1).

6. The optical module (1) as described in the preceding claim, wherein, The first axis and the second axis are parallel.

7. The optical module (1) as described in any of the preceding claims, wherein, The third optical surface (13) and / or the fourth optical surface (14) respectively include a third set of prisms and a fourth set of prisms, which extend parallel to a third axis perpendicular to the optical axis (O1).

8. The optical module (1) as described in the preceding claim, wherein, The third axis is parallel to the first axis.

9. The optical module (1) as described in any of the preceding claims in conjunction with claim 4, wherein, The width of the gap (100) is the same as the width of the cylindrical segment (19) that forms the first part (21) of the optical module (1).

10. A light-emitting device for a motor vehicle, the light-emitting device comprising: - Load-bearing components; - At least one light source (2), said at least one light source being fastened to the carrier; - At least one optical module (1) as described in any of the preceding claims, wherein the base (10) of each optical module (1) is in contact with the carrier on either side of one of the at least one light source (2).

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