Assembly of a housing and a lens of a lighting device

Abstract

The invention relates to a lighting device (1) for a motor vehicle, the device comprising a housing (2) provided with an opening, a light source positioned inside the housing, and a lens (4) for closing the opening in the housing, the lens comprising a central region (5) intended to have light rays from the light source pass therethrough and a peripheral region (6) extending all the way around the central region, the peripheral region (6) being in contact with a peripheral edge (11) of the housing along a closed contact line (LC), the peripheral region (6) of the lens comprising a first rib (12), the first rib extending only along a first portion (14) of the contact line (LC), the first rib (12) being welded against a first receiving surface (13) arranged on the peripheral edge (11) of the housing.

Description

Assembly of a housing and a lens for a lighting device Technical field of the invention

[0001] The invention relates to a lighting device for a motor vehicle. In particular, the invention relates to a specific mounting interface between a housing and a closing lens of the lighting device. The invention also relates to a method for manufacturing such a lighting device. Prior art

[0002] Lighting devices for motor vehicles generally comprise a housing containing a light source and optical components. Such a lighting device also includes a housing cover, at least partially transparent or translucent, designed to allow light rays from the light source to pass through. The cover protects the lighting device from any kind of debris and must therefore be securely attached to the housing.

[0003] The case and the glass are generally made of plastic. To attach the glass to the case, a process is known to involve locally heating the case and / or the glass to weld them together. To achieve a robust, precise, and watertight bond between the case and the glass, the glass is fitted with a rib, called a "welding rib" or "welding fin," which extends along its perimeter. The rib extends towards the case from an inner face of the glass and perpendicular to that inner face. This rib is designed to make contact with a corresponding receiving surface on the case. To perform the weld, the glass is placed against the case, pressure is applied to the glass, and a heat source is directed along the rib and the receiving surface to locally melt the plastic of the case and / or the glass.

[0004] Furthermore, a lighting device typically includes a three-dimensional shape designed to meet stylistic requirements and to complement the silhouette of a motor vehicle. It is therefore common for a lighting device lens to have a three-dimensional shape curved in several directions.

[0005] The manufacture of such a glass is advantageously achieved by molding. However, a glass with both a curved shape and a weld rib extending along its perimeter presents undercuts that can become trapped in a manufacturing mold. Therefore, manufacturing such a glass by molding requires the use of a more complex mold. In practice, a multi-part mold, called "drawers," is used, with the drawers moving relative to each other. Besides the complexity of such molds, the presence of drawers within the mold causes a boundary line to appear on one face of the glass. This boundary line remains visible and detracts from the aesthetic appearance of the lighting fixture.

[0006] To simplify the manufacturing of the glass by molding, it is known to form the weld rib on the case, rather than on the glass. However, in this case, the problem is simply shifted to the case, which in turn becomes very complex to manufacture by molding. Presentation of the invention

[0007] The object of the invention is to provide a lighting device for motor vehicles and a method for manufacturing such a lighting device which remedies the above disadvantages and improves upon lighting devices and their manufacturing methods known in the prior art.

[0008] More specifically, a first object of the invention is a lighting device comprising a housing and a glass assembled together by welding which is simple to manufacture and without aesthetic defects.

[0009] The invention relates to a lighting device for a motor vehicle, comprising a housing provided with an opening, a light source positioned inside the housing, and a glass cover for the opening of the housing, the glass cover comprising a central area intended to be traversed by light rays from the light source and a peripheral area extending all around the central area, the peripheral area being in contact with a peripheral edge of the housing along a closed contact line, the peripheral area of ​​the glass cover comprising a first rib, the first rib extending only along a first portion of the contact line, the first rib being welded against a first receiving surface provided on the peripheral edge of the housing, the peripheral edge of the housing comprising a second rib, the second rib extending only along a second portion of the contact line,the second portion being a section of the contact line complementary to the first portion, the second rib being welded against a second receiving surface constructed on the peripheral zone of the ice.

[0010] By "complementary" we understand that the sum of the first portion and the second portion covers the entire contact line.

[0011] The ice can be obtained by molding, and / or the case can be obtained by molding.

[0012] The glass may be made of plastic, in particular polycarbonate or poly-methyl methacrylate acrylic, and / or the casing may be made of plastic, in particular acrylonitrile butadiene styrene or a mixture of acrylonitrile butadiene styrene and polycarbonate.

[0013] The contact line may include at least one transition portion along which the first rib is in contact with the second rib.

[0014] The first rib may have a decreasing extension dimension when traversing the transition portion towards the second portion. The second rib may have a decreasing extension dimension when traversing the transition portion towards the first portion.

[0015] At any point on the first portion of the contact line, the first rib may extend along an extension direction, the extension direction of the first rib forming an angle between 60° and 120° inclusive, in particular between 75° and 105° inclusive, with the first receiving surface, at the point of the first portion considered. At any point on the second portion of the contact line, the second rib extends locally along an extension direction, the extension direction of the second rib forming an angle between 60° and 120° inclusive, in particular between 75° and 105° inclusive, with the second receiving surface, at the point of the second portion considered.

[0016] At any point on the contact line, the first rib and / or the second rib can extend parallel to an extension direction, the set of extension directions corresponding to all points on the contact line forming an angle less than or equal to 30° with a given direction axis.

[0017] The peripheral zone of the ice may include a darker color than the central zone of the ice.

[0018] The invention also relates to a method of manufacturing a lighting device as defined above, the method comprising: - manufacturing a housing, in particular by molding - manufacturing a lens, in particular by molding, then - pressing the lens against the housing so that the lens is in contact with the housing along a closed contact line, then - heating the housing and / or the lens so as to locally melt the housing and / or the lens at the contact line.

[0019] All points along the contact line can be heated simultaneously or progressively. Heating of the housing and / or the glass can be achieved using a laser beam emission device. Presentation of the figures

[0020] These objects, features and advantages of the present invention will be described in detail in the following description of a particular embodiment, given by way of non-limiting example, with reference to the accompanying figures, among which:

[0021]

[0022] This is a front view of a lighting device according to an embodiment of the invention.

[0023] This is a perspective and top view of the lighting device.

[0024] This is a perspective view of a housing for the lighting device.

[0025] This is a perspective view of a mirror of the lighting device.

[0026] This is a cross-sectional view, according to a first plane P1, of the housing and glass of the lighting device.

[0027] This is a view of a first detail of the.

[0028] This is a view of a second detail of the...

[0029] This is a cross-sectional view, according to a second plane P2, of the housing and glass of the lighting device.

[0030] This is a view of a first detail of the.

[0031] This is a view of a second detail of the...

[0032] This is a cross-sectional view, according to a third plane P3, of part of the housing and glass of the lighting device.

[0033] This is a perspective view of part of a peripheral area of ​​the ice of the lighting device.

[0034] This is a cross-sectional view, according to a fourth plane P4, of the housing and glass of the lighting device.

[0035] This is a cross-sectional view of a detail of the welding area in an initial configuration.

[0036] This is a cross-sectional view of a detail of the weld area in a second configuration that is more favorable than the first configuration. Detailed description

[0037] Figures 1 and 2 schematically illustrate a lighting device 1 according to one embodiment of the invention. The lighting device 1 is intended to be integrated into a motor vehicle to perform a lighting and / or signaling function. According to the embodiment presented, the lighting device is a rear signaling device. The lighting device is thus intended to make the vehicle clearly visible to road users positioned behind the vehicle. Alternatively, the lighting device could be adapted to perform any other lighting function. In particular, the lighting device could be a lighting device intended to be integrated into the front of a motor vehicle.

[0038] The lighting device 1 is considered to be designed to produce a light beam centered on a light emission axis, also called the optical axis XO. The X-axis is defined as an axis parallel to the optical axis XO. The X-axis can correspond to a longitudinal axis of the vehicle into which the lighting device is integrated, that is, an axis parallel to the direction in which the vehicle is moving in a straight line. The X-axis is oriented in the direction of propagation of the light rays. In this case, since the lighting device is a rear lighting device, the X-axis is oriented from the front to the rear of the vehicle, or in other words, in the direction of reversing. The Y-axis designates the transverse axis of the lighting device. The Y-axis is oriented from left to right, left and right being defined according to the viewpoint of a user whose gaze is oriented parallel to the optical axis XO, in the opposite direction to the propagation of the light rays.The Z-axis is the axis perpendicular to the X and Y axes. The Z-axis is a vertical axis, oriented from bottom to top, particularly when the lighting device is in its normal operating position and orientation. The X, Y, and Z axes form an orthogonal coordinate system.

[0039] The lighting device 1 includes a housing 2, also called a casing, shown separately in the figure. The housing 2 comprises a set of walls forming a protective enclosure around the various components of the lighting device 1, in particular around a light source housed inside the housing. Furthermore, the housing 2 also serves as a support for various components of the lighting device, for example, optical lenses, and as a means of attaching the lighting device to the vehicle. To this end, the housing may include a set of fastening means 3, for example, mounting holes for use with fixing screws and / or recesses shaped to receive components of the lighting device. Finally, the housing includes an opening adapted to allow the light rays from the light source to exit the housing.

[0040] The light device 1 also includes a closing lens 4, shown separately in the figure. The lens 4 is fixed to the housing 2 and forms a cover for the housing, closing the opening of the housing. The lens 4 is at least partially transparent or translucent. In particular, the lens 4 comprises a central area 5 intended to allow light rays from the light source to pass through it, and a peripheral area 6 extending all around the central area 5. The lens 4 is fixed to the housing 2 via its peripheral area 6. In particular, the peripheral area 6 is in contact with the housing 2 along a closed contact line LC, identified by a dashed line in the figure. By "closed," it is understood that the contact line LC forms a loop, that is, a line closed upon itself. The lens 4 is therefore fixed around its entire circumference to the housing 2. This creates a sealed interface between the housing 2 and the lens 4.This prevents water from entering the case 2 and / or condensation from forming on an inner face of the glass 4.

[0041] Lens 4 has a three-dimensional shape designed to conform to the lines of the vehicle in which the lighting system is integrated and / or to contribute to a particular aesthetic appearance of the vehicle. An outer face of lens 4 thus comprises a plurality of tangent planes, these tangent planes forming non-zero angles with each other. To illustrate this characteristic, various axes A1, A2, A3, A4, A5, A6 perpendicular to tangent planes of the outer face of lens 5 are shown as examples. It can be observed that axes A1, A2, A3, A4, A5, A6 extend in different directions from each other. The various axes perpendicular to the tangent planes of the outer face of the lens can form an angle between 0° and 45°, or even between 0° and 90°, with the optical axis XO. The outer face of the ice 4 is therefore neither flat, nor even a cylindrical face, that is to say a face made up of parallel straight line segments.The LC contact line is also a three-dimensional line, that is, the LC contact line does not extend in a single plane but in the three directions of space.

[0042] For example, according to the illustrated embodiment, the outer face of the glass 4 comprises a front portion 7 including a tangent plane extending generally parallel to a rear face of the vehicle, that is, parallel to the Y and Z axes. The outer face of the glass also comprises a lateral portion 8 including a tangent plane extending generally parallel to a fender of the vehicle or in line with the fender of the vehicle. The outer face of the glass also comprises a recessed portion 9 relative to the front portion 7. The recessed portion 9 may include a non-zero component along the X axis and may be intended to be covered or masked by another element of the vehicle. The various portions 7, 8, and 9 of the outer face of the glass 4 may be flat or rounded.These sections 7, 8, and 9 can extend continuously from one another without clear boundaries between them, or they can be more distinctly separated by edges. Alternatively, other forms of ice 4 could of course be considered.

[0043] Glass 4 is preferably obtained by molding. Glass 4 can notably be obtained by injecting molten plastic into an injection mold. Preferably, glass 4 is made of polycarbonate, more commonly known by the acronym PC, or polymethyl methacrylate, more commonly known by the acronym PMMA.

[0044] The central zone 5 of the glass is made of a transparent or translucent material. Preferably, the central zone 5 has a substantially constant thickness along the direction of light propagation. The central zone 5 may optionally be tinted, for example, with a red color so that the light-emitting device 1 produces red light when the light source is switched on. The peripheral zone 6 includes a mounting interface through which the glass 4 is attached to the housing 2. The peripheral zone 6 may be a darker color than the central zone of the glass so as to visually obscure the mounting interface, for example, black.As we will see later, it is nevertheless advantageous for the peripheral zone to be at least partially transparent or translucent to certain types of radiation in order to implement a process of bonding the glass to the casing using suitable radiation. The peripheral zone 6 and the central zone 5 can be made of the same material or of materials that differ only in color. Advantageously, the peripheral zone 6 can be overmolded onto the central zone 5.

[0045] Housing 2 is preferably also obtained by molding. Housing 2 can, in particular, be obtained by injecting molten plastic into an injection mold. For example, housing 2 can be made of acrylonitrile butadiene styrene, more commonly known by the acronym ABS, or of a mixture of acrylonitrile butadiene styrene and polycarbonate (ABS / PC).

[0046] The housing 2 comprises a set of walls delimited by a peripheral edge 11, against which the peripheral area 6 of the glass 4 is fixed. The peripheral edge 11 and the peripheral area 6 thus present conjugate surfaces, each following the shape of the contact line LC.

[0047] The attachment of the glass 4 to the housing 2 is now described in more detail. For attaching the glass 4 to the housing 2, the peripheral area 6 of the glass 4 includes a first rib 12 welded to a first receiving surface 13 formed on the peripheral edge 11 of the housing 2. The first receiving surface 13 thus extends opposite the first rib 12. The first rib 12 extends only along a first portion 14 of the contact line LC. In other words, the first rib 12 does not extend along the entire contact line LC but only along a part of it. The first portion 14 is identified by a dashed line in Figures 3 and 4. The first rib thus comprises a first end 15 and a second end 16 opposite the first end 15.

[0048] The first rib 12, also called the "welding rib" or "welding fin," is a thin, profiled, blade- or plate-shaped extension projecting in a direction of extension toward the receiving surface 13 formed on the peripheral edge 11 of the housing 2. The direction of extension of the first rib can be defined locally as the direction that is both perpendicular to the contact line LC and perpendicular to a direction defining the thickness of the first rib. The first rib 12 may, for example, include a section perpendicular to the contact line LC that is generally rectangular or parallelogram-shaped. The first rib 12 is designed to facilitate a welding operation between the glass 4 and the housing 2. The first rib 12 forms a monolithic unit with the peripheral portion 6 of the glass 4. The first rib 12 is formed, in particular, by molding during the manufacturing of the glass.

[0049] To better visualize the first rib 12, a cross-sectional view of the case 2 and the lens 4 is shown in a first plane P1, perpendicular to the X-axis. Figures 6 and 7 illustrate two details D1 and D2, respectively. The thickness e1 of the first rib 12 is defined locally as the dimension of the first rib perpendicular to the contact line LC and parallel to a contact surface between the case and the lens. The extension length l1 of the first rib 12 is defined locally as the dimension of the first rib perpendicular to the contact line LC and perpendicular to the contact surface between the case and the lens.

[0050] The first rib 12 can advantageously include a small, constant thickness e1 along the LC contact line. The thickness e1 can be, for example, between 1 mm and 3 mm inclusive, for example, on the order of 2 mm. Thus, the first rib 12 has moderate thermal inertia and can melt relatively quickly when heated. Such a thickness therefore facilitates the crushing of the first rib 12 upon contact with the first receiving surface 13 during the assembly of the case and the glass.

[0051] The first rib 12 may include a constant length l1 along the LC contact line. The length l1 may be between 2mm and 6mm, preferably between 3mm and 5mm.

[0052] The first receiving surface 13 can be a flat surface on the scale of the first rib 12. Alternatively, the first receiving surface 17 could also be non-planar, for example provided with small reliefs intended to promote welding with the first rib 12. A width e2 of the receiving surface can be at least three times equal to the width e1 of the first rib.

[0053] Figures 6 and 7 also show that the end of the first rib 12 is positioned in interference with the first receiving surface 13. This view corresponds to a theoretical undeformed state of the first rib 12 and the receiving surface 13. In practice, when the glass 4 is welded to the housing 2, the end of the first rib 12 is pushed into the first receiving surface and / or crushed against the first receiving surface.

[0054] Advantageously, the first rib 12 can be in substantially orthogonal contact with the first receiving surface 13. By "substantially orthogonal contact," we understand that the extension direction in which the first rib 12 extends forms an angle α of approximately 90° with the first receiving surface 13. Orthogonal contact improves the quality of the weld between the first rib 12 and the first receiving surface. Alternatively, the extension direction in which the first rib 12 extends can also be provided for, forming an angle α other than a right angle with the receiving surface. This angle α is nevertheless preferably between 60° and 120°, or even between 75° and 105° inclusive. An angle α other than a right angle can be useful for facilitating the molding or demolding of the ice.

[0055] Furthermore, it is advantageous that all the extension directions of the first rib 12, corresponding to all points of the first portion 14 of the contact line LC, form a relatively small angle with a given direction axis, for example, an angle less than or equal to 30°. Thus, when pressure is applied against the glass 4 parallel to the direction axis to bring it into contact with the housing 2, pressure is exerted on the first rib, which is oriented substantially parallel to the extension direction in which it extends. This prevents any slippage at the interface between the first rib and the first receiving surface, and thus improves the quality of the weld between the first rib and the first receiving surface.

[0056] Similarly, the peripheral edge 11 of the housing 2 includes a second rib 17 welded to a second receiving surface 18 formed on the peripheral area 5 of the ice 4. The second receiving surface 18 thus extends opposite the second rib 17. Likewise, the second rib 17 extends only along a second portion 19 of the contact line LC. This second portion 19 is illustrated in Figures 3 and 4. The second portion 19 is a substantially complementary portion of the contact line to the first portion 14, that is to say, the sum of the two portions 14 and 19 covers the entire contact line LC. The second rib 17 thus comprises a first end 20 and a second end 21 opposite the first end 20. The two ends 20 and 21 of the second rib are positioned substantially opposite the two ends 15 and 16 of the first rib 12.As we will see later, there is a slight overlap of the first portion 14 and the second portion 19 at the level of two transition portions.

[0057] Advantageously, the second rib 17 has the same dimensional and / or orientation characteristics as the first rib 12. Similarly, the second receiving surface 18 has the same dimensional and / or orientation characteristics as the first receiving surface 13. The second rib 12 interacts with the second receiving surface 18 in the same way that the first rib interacts with the first receiving surface. The second rib 17 differs from the first rib 12 primarily in that it extends from the housing 2, and not from the ice 4. The second rib 17 therefore forms a monolithic unit with the housing 2. The second rib 17 is notably formed by molding during the manufacturing of the ice.

[0058] To better visualize the second rib 17, a cross-sectional view of the housing 2 and the glass 4 is shown in a second plane P2, perpendicular to the X-axis. Figures 9 and 10 illustrate details D3 and D4 of the second rib 17, respectively. The second rib 17 may advantageously have a thickness e1 and / or a length l1 that is identical or of the same order of magnitude as the thickness and / or length of the first rib 12. Similarly, the second receiving surface 18 may be a flat surface scaled to the second rib 17. The end of the second rib 17 may also be positioned to interfere with the second receiving surface 18. When the glass is welded to the housing, the end of the second rib 17 may be pressed into the second receiving surface 18 and / or crushed against it.

[0059] The specific arrangement of the two ribs 12 and 17, respectively on the lens 4 and the case 2, makes the case 2 and lens 4 easier to manufacture by molding. Indeed, since the first rib 12 does not extend over the entire peripheral area 6, the lens 4 does not have an undercut and remains easy to demold. This eliminates the need for a drawer-type mold to manufacture the lens 4. Thus, the manufacturing process is simplified and avoids the formation of a mark on the central area of ​​the lens that would result from using a drawer in the mold. Similarly, since the second rib 17 does not extend over the entire peripheral edge 11, the case 2 does not have an undercut and also remains easy to demold. Therefore, simplifying the manufacturing of the lens 4 does not increase the complexity of manufacturing the mold 2.

[0060] It is therefore understood that the contact line LC can be divided into two portions corresponding to portions 14 and 19 previously described. These two portions 14 and 19 may slightly overlap at two transition portions 22 and 23 formed at their ends. In the transition portions 22 and 23, the first rib 12 is thus in contact with the second rib 17. A first transition portion 22 extends from the first end 15 of the first rib 12 to the first end 20 of the second rib 17. A second transition portion 23 extends from the second end 16 of the first rib 12 to the second end 21 of the second rib 17.

[0061] Figure 1 is a cross-sectional view of the housing 2 and the glass along a third plane P3 at the level of the first transition portion 22. Figure 2 illustrates in more detail the first rib 12 at the level of the first transition portion 22. It can be observed that the first rib 12 has a decreasing extension dimension l1 as one traverses the transition portion 22 towards the second portion 19, that is, towards the end 15 of the first rib. Similarly, the second rib 17 has a decreasing extension dimension l1 as one traverses the transition portion towards the first portion. The second transition portion 23 is advantageously analogous to the first transition portion 22. Thus, the sum of the extension dimension l1 of the first rib 12 and the second rib 17 can be substantially constant along the contact line LC.The transition portions 22, 23 improve the sealing of the interface between the glass and the case between the two portions 14 and 19. Apart from the transition portions, the first rib 12 and the second rib 17 preferentially comprise a profiled shape, that is to say a substantially constant extension length l1 and a substantially constant width e1.

[0062] Figure 1 illustrates a cross-sectional view of the housing 2 and the glass 4 in a fourth plane P4, perpendicular to the Z axis. Figure 1 allows visualization on the same figure of the first rib 12 in contact with the first receiving surface 13, and the second rib 17 in contact with the second receiving surface 18.

[0063] The invention also relates to a method for manufacturing the lighting device 1 described above. Advantageously, the method first comprises a manufacturing step for the lens 4 and a manufacturing step 2 for the housing. As explained previously, the lens and the housing are preferably manufactured by molding. Such a method is particularly economical and allows for excellent geometric accuracy. Since the ribs 12 and 17 extend only over a portion of the circumference of the lens or, respectively, the housing, manufacturing by molding remains simple to implement. Next, the various components of the lighting device can be positioned and fixed. In particular, the light source can be positioned and fixed inside the housing 2. When all the components are correctly positioned, the housing can be closed with the lens 4.To achieve this, the glass is placed against the housing so that it is in contact with the housing along the contact line LC. The first rib 12 is then in contact with the first receiving surface 13, and the second rib 17 is in contact with the second receiving surface 18. Good contact between the glass and the housing can be ensured by applying a moderate force to the glass in the direction of the housing. This force is advantageously oriented parallel to the previously described direction axis.

[0064] When the extension axis of the ribs 12, 17 forms a moderate angle, preferably less than or equal to 30°, with the direction axis, the pressure of the crystal against the case prevents slippage at the interface between the crystal and the case, which could negatively impact the welding process. Advantageously, since the invention facilitates the formation of the ribs by molding, they can also be more easily oriented in a desired direction, particularly to form a moderate angle with the direction axis. The invention thus improves the quality of the weld between the crystal and the case.

[0065] Figures 14 and 15 illustrate this principle. In Figure 1, the second rib 17 forms a relatively large angle β with the direction axis AD. When pressure is applied to the ice parallel to the direction axis AD, there is a risk of slippage at the interface between the second rib 17 and the receiving surface 18. Conversely, in Figure 2, the second rib 17 forms a smaller angle β with the direction axis AD. When pressure is applied to the ice parallel to the direction axis AD, there is no risk of slippage at the interface between the second rib 17 and the receiving surface 18.

[0066] Advantageously, the plastic material construction of the case and the glass allows slight deformations of these components, which makes it possible to obtain perfect contact all along the LC contact line.

[0067] Next, the housing 2 and / or the glass 4 are heated to melt the housing and / or the glass locally at the LC contact line. In a preferred embodiment, all points of the LC contact line are heated simultaneously. This results in a robust attachment of the glass to the housing, without over-constraint or internal stresses. Simultaneous heating of all points of the contact line can be achieved, for example, by means of a laser beam emission device. The laser beam emission device may advantageously include an array of optical fibers capable of guiding laser beams along the entire LC contact line. The laser beams are preferably oriented parallel to the extension axis of the first rib and / or the second rib.To implement this process, it is preferable that one plastic material—either the casing material or the glass material—be transparent to the radiation emitted by the emitting device, while the other plastic material—either the casing material or the glass material—be absorbent of the intended laser radiation. Preferably, the casing is absorbent and the glass is transparent, but the reverse could also be considered. The wavelength of the laser radiation could be, for example, 980 nm. The absorbent material can be dark-colored, but not necessarily so, it being understood that the definition of a dark color is in the visual range, while the absorbent material is intended to absorb light radiation corresponding to the wavelength of the laser radiation.

[0068] Alternatively, other methods for locally melting the casing and / or the glass at the LC contact line can be considered. For example, in one alternative method, a robot-mounted laser source can be moved along the LC contact line between the casing and the glass and gradually heat this contact line.

Claims

A lighting device (1) for a motor vehicle, comprising a housing (2) having an opening, a light source positioned inside the housing, and a lens (4) for closing the opening of the housing, the lens comprising a central area (5) intended to be traversed by light rays from the light source and a peripheral area (6) extending all around the central area, the peripheral area (6) being in contact with a peripheral edge (11) of the housing along a closed contact line (LC), characterized in that the peripheral area (6) of the lens comprises a first rib (12), the first rib extending only along a first portion (14) of the contact line (LC), the first rib (12) being welded against a first receiving surface (13) arranged on the peripheral edge (11) of the housing, and in that the peripheral edge (11) of the housing comprises a second rib (17),the second rib extending only along a second portion (19) of the contact line (LC), the second portion being a portion of the contact line complementary to the first portion (14), the second rib being welded against a second receiving surface (18) arranged on the peripheral zone (6) of the ice. Light device (1) according to the preceding claim, characterized in that the glass (4) is obtained by molding, and / or in that the housing (2) is obtained by molding. Light device (1) according to any one of the preceding claims, characterized in that the lens (6) is made of plastic, in particular polycarbonate or poly-methyl methacrylate acrylic, and / or in that the housing (2) is made of plastic, in particular acrylonitrile butadiene styrene or a mixture of acrylonitrile butadiene styrene and polycarbonate. Light device (1) according to any one of the preceding claims, characterized in that the contact line (LC) includes at least one transition portion (22, 23) along which the first rib (12) is in contact with the second rib (17). luminous device (1) according to the preceding claim, characterized in that the first rib (12) comprises an extension dimension (l1) decreasing when traversing the transition portion (22, 23) towards the second portion (18), and / or in that the second rib (17) comprises an extension dimension decreasing when traversing the transition portion (22, 23) towards the first portion (14). A lighting device (1) according to any one of the preceding claims, characterized in that, at any point of the first portion (14) of the contact line (LC), the first rib (12) extends along an extension direction, the extension direction of the first rib forming an angle (α) between 60° and 120° inclusive, in particular between 75° and 105° inclusive, with the first receiving surface (13), at the level of the point of the first portion considered, and / or in that, at any point of the second portion (18) of the contact line (LC), the second rib (17) extends locally along an extension direction, the extension direction of the second rib forming an angle (α) between 60° and 120° inclusive, in particular between 75° and 105° inclusive, with the second receiving surface (18), at the level of the point of the second portion considered. A luminous device (1) according to any one of the preceding claims, characterized in that, at any point of the line of contact (LC), the first rib (12) and / or the second rib (17) extends parallel to an extension direction, the set of extension directions corresponding to all points of the line of contact forming an angle less than or equal to 30° with a given direction axis. Light device (1) according to any one of the preceding claims, characterized in that the peripheral zone (6) of the ice comprises a darker color than the central zone (5) of the ice. Method of manufacturing a luminous device (1) according to one of the preceding claims, characterized in that it comprises:- manufacturing a housing (2), in particular by molding- manufacturing a lens (4), in particular by molding, then- pressing the lens against the housing so that the lens is in contact with the housing along a closed contact line (LC), then- heating the housing and / or the lens so as to locally melt the housing and / or the lens at the contact line. Manufacturing method according to the preceding claim, characterized in that all points of the line of contact (LC) are heated simultaneously or progressively along the line of contact, and / or that the heating of the housing and / or the glass is achieved by a laser beam emitting device.

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