Light guide comprising a reflection surface with a plurality of adjacent facets

Abstract

A light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) for a motor vehicle, comprising a guide portion (14) for guiding light rays (RL) extending mainly along an extension axis (Y1), and an entry surface (13), the entry surface being intended to receive light rays emitted by a first light source (8.2, 8.3, 8.4, 8.5, 8.6, 8.7) centred on a first emission axis (X1), the first emission axis being perpendicular to the extension axis, the light guide comprising an internal reflection surface (16) reflecting the light rays emitted by the light source, the reflection surface comprising a plurality of adjacent facets (17A, 17B, 17C, 17D), each facet having a different orientation from the neighbouring facets and / or each facet being offset from the neighbouring facets.

Description

[0001] DESCRIPTION

[0002] TITLE: Light guide comprising a reflective surface provided with a plurality of adjacent facets

[0003] Technical field of the invention

[0004] The invention relates to a light guide for use in a lighting system for a motor vehicle. The invention also relates to a lighting system comprising such a light guide. Furthermore, the invention relates to a front or rear face of a motor vehicle comprising such a lighting system.

[0005] Prior art

[0006] Motor vehicles are typically equipped with a front and / or rear end featuring a lighting system. Such a lighting system helps make the vehicle highly visible to other road users and contributes to its distinctive aesthetic appearance.

[0007] It is known to offer lighting devices comprising a light guide and a light source configured to inject light rays into the light guide. A light guide is generally an elongated, transparent element within which the light rays from the light source are guided by total internal reflection. The light rays emitted by the light source typically enter the light guide through an inlet surface, positioned at one end of the light guide and oriented perpendicular to the emission axis of the light source's rays. The light rays injected into the light guide are intended to be reflected off the walls of the light guide or scattered out of the light guide, thus making the light guide visible.This allows for the production of a uniquely shaped light pattern with particularly uniform brightness along the light guide. Curved light guides are sometimes desirable, especially to conform to the contours of a motor vehicle and / or to accommodate limited available space. However, certain geometric shapes of light guides can lead to significant light leakage. For example, when a light guide has a rounded shape with a small radius of curvature, the light rays guided within the guide are more easily diffused outwards at this rounded point. The light guide then exhibits undesirable localized light leakage. The resulting illuminated appearance with such light guides is not uniform and / or the resulting light intensity is insufficient.To limit unwanted light leaks, minimum radii of curvature are imposed on the shapes of light guides, which makes the light guides particularly bulky and / or complex to integrate into a front or rear face of a vehicle.

[0008] In particular, Figure 9 illustrates a particularly bulky lighting device. Such a lighting device comprises a light source l' fixed to a printed circuit board 2' and a light guide 3' guiding light rays RL' from the light source 1'. The light guide 3' comprises a first portion 4' extending parallel to the printed circuit board and a second portion 5' in the shape of a quarter circle whose radius r' must be sufficiently large to prevent massive light leakage from the light guide 1' at this second portion. The footprint E', perpendicular to the plane in which the printed circuit board extends, is particularly important to avoid unwanted light leakage F' and / or to obtain homogeneous illumination.

[0009] Presentation of the invention

[0010] The object of the invention is to provide a light guide and a lighting device comprising such a light guide, overcoming the above-mentioned drawbacks and improving upon known prior art light guides and lighting devices. More specifically, a first object of the invention is a light guide and a lighting device comprising such a light guide that is both compact, allows light rays to be guided without unwanted light leakage, and produces homogeneous illumination.

[0011] Summary of the invention

[0012] The invention relates to a light guide for a motor vehicle comprising a light ray guiding portion extending mainly along an extension axis, and an inlet surface, the inlet surface being intended to receive light rays emitted by a first light source centered on a first emission axis, the first emission axis being perpendicular or substantially perpendicular to the extension axis, the light guide comprising an internal reflection surface for the light rays emitted by the light source, the reflection surface comprising a plurality of adjacent facets, each facet comprising a different orientation from the neighboring facets and / or each facet being offset from the neighboring facets, each facet being configured to reflect the light rays from the light source towards a convergence zone positioned in said guiding portion.

[0013] Each facet can be planar. Each facet can include a polygonal shape, in particular a quadrilateral shape. Each facet can include a quadrilateral shape where each side measures between 0.5 mm and 3 mm inclusive, in particular each facet can include a square shape where each side measures between 0.8 mm and 1.2 mm inclusive.

[0014] The reflection surface may include a parabolic carrier surface, each facet resulting from a local modification of the carrier surface.

[0015] The convergence zone may include a cross-sectional area not exceeding one-third of the cross-sectional area of ​​the guiding portion. The convergence zone may be positioned substantially at the center of a cross-section of the guiding portion. The guiding portion may include a light-beam mixing zone, with the convergence zone positioned within the mixing zone.

[0016] The inlet surface may be flat. The inlet surface may form an angle of less than or equal to 30° with the extension axis, or even less than or equal to 10°, or even less than or equal to 5°. The inlet surface may form an angle of at least 45° with the first emission axis, or even approximately 90°.

[0017] The invention also relates to a lighting device for a motor vehicle comprising a first light source and a light guide as defined above, the first light source being arranged to illuminate the entry surface of the light guide, the first light source comprising a first axis of light emission extending perpendicularly or substantially perpendicularly to the axis of extension of the guiding portion of the light guide.

[0018] The lighting device may further include a second light source comprising a second light emission axis parallel to the first light emission axis, and an optical element such as an optical lens or optical mask extending in front of the second light source along the second light emission axis.

[0019] The said optical element may include an emblem for a motor vehicle.

[0020] The first light source and the second light source can be electrically connected to the same printed circuit board.

[0021] The invention also relates to a front or rear face for a motor vehicle comprising a lighting device as defined above. Figures are shown below.

[0022] 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:

[0023] Figure 1 is a perspective view of a front face of a motor vehicle according to an embodiment of the invention.

[0024] Figure 2 is a perspective view of part of the front face of Figure 1.

[0025] Figure 3 is a schematic view of a lighting device according to one embodiment of the invention, the lighting device being integrated into the front face of Figure 1.

[0026] Figure 4 is a front view of a housing intended to accommodate the lighting device of Figure 3.

[0027] Figure 5 is a front view of a light guide according to an embodiment of the invention, the light guide being integrated into the lighting device of Figure 3.

[0028] Figure 6 is a perspective view of a reflection surface of the light guide.

[0029] Figure 7 is a side view of the reflection surface.

[0030] Figure 8 is a front view of the reflection surface.

[0031] Figure 9 is a schematic side view of a larger lighting device.

[0032] Detailed description

[0033] Figure 1 schematically illustrates a front face 1 of a motor vehicle according to an embodiment of the invention. The front face 1 comprises a left headlight 2G, a right headlight 2D, and a central portion 3 extending between the left headlight 2G and the right headlight 2D. The central portion 3 may be, for example, part of a front grille or a portion adjacent to a front grille. The central portion 3 includes a support for a vehicle emblem 4. The emblem 4 comprises a graphic representation of a make or model of the vehicle. The emblem 4 is generally highlighted by being positioned in the center of the front face 1. The front face 1, and in particular the central portion 3 of the front face, comprises a lighting device 5 according to an embodiment of the invention.The embodiment of the lighting device 5 which will be described in relation to a front of a vehicle could be adapted for a rear of a vehicle, or even for any lighting device intended to be visible from outside or from inside the vehicle.

[0034] In this document, the X-axis represents the longitudinal axis of the vehicle. When moving forward in a straight line, the vehicle progresses from rear to front in a direction parallel to its longitudinal axis. The X-axis is oriented from the front to the rear of the vehicle, that is, in the direction of reverse. The Y-axis represents the transverse axis of the vehicle. The Y-axis is oriented from left to right, with left and right defined from the perspective of a driver of the vehicle. The Z-axis is perpendicular to the X-axis and the Y-axis. The vehicle is assumed to be resting on a horizontal surface. The Z-axis is a vertical axis, oriented from bottom to top. The X, Y, and Z axes form an orthogonal coordinate system.

[0035] Figure 2 partially illustrates the central portion 3 of the front panel 1. The central portion 3 comprises a band 6 extending parallel to the Y-axis on either side of the emblem 4, between the two projectors 2G, 2D. The lighting device 5 is arranged behind the band 6. The lighting device 5 is configured to backlight the emblem 4 and to provide at least one light strip, in particular three light strips 7A, 7B, 7C extending horizontally on either side of the emblem 4. The light strips are arranged one above the other. According to the embodiment shown, the central portion 3 comprises three light strips extending to the left and three light strips extending to the right of the emblem 4. Alternatively, the number of light strips and / or their arrangement could be different.

[0036] The lighting device 5 can be attached to a body panel or bodywork component. The lighting device 5 is intended to make the vehicle highly visible to other road users and / or to give the vehicle a distinctive lighting signature. According to the embodiment shown, the lighting device 5 is not intended to illuminate the surroundings of the vehicle to enable driving in the dark. However, according to an alternative embodiment, the lighting device could incorporate at least one light source intended to illuminate the surroundings.

[0037] Figure 3 schematically illustrates the lighting device 5 in front view. The lighting device 5 comprises seven light sources 8.1, 8.2, 8.3, 8.4, 8.5, 8.6 and

[0038] 8.7 electrically connected to the same printed circuit board 9. The printed circuit board 9 extends in a plane that is generally parallel to the Y and Z axes. The light sources can be, for example, light-emitting diodes (LEDs). Typically, each light source is configured to produce a beam of light, for example, in the form of a cone, centered on a light-emitting axis. The light-emitting axis of the light sources is perpendicular to the plane in which the printed circuit board extends, and therefore parallel to the X-axis.

[0039] Light source 8.1 is configured to backlight emblem 4. Light source 8.1 can therefore be positioned behind emblem 4 along the X-axis, approximately at the center of the emblem. A mask and / or optical filter may optionally be provided between emblem 4 and light source 8.1. The lighting system 5 also includes six light guides 10.2, 10.3, 10.4, 10.5, 10.6 and

[0040] 10.7 cooperate respectively with the six light sources 8.2, 8.3, 8.4, 8.5, 8.6 and 8.7. Each light source is positioned opposite one end of a light guide. Light guides 10.2, 10.3 and 10.4 extend parallel to the Y-axis to the right of the printed circuit board 9. Light guides 10.5, 10.6 and 10.7 extend parallel to the Y-axis to the left of the printed circuit board 9. Light guides 8.5, 8.6, 8.7 are intended to form the three light strips 7A, 7B, 7C.

[0041] Figure 4 illustrates in more detail a support 11 intended to accommodate the light device 5, as well as the six light guides 10.2, 10.3, 10.4, 10.5, 10.6 and 10.7. The support 11 includes a housing 12 in which the printed circuit board 9, equipped with the seven light sources 8.1, 8.2, 8.3, 8.4, 8.5, 8.6 and 8.7, is positioned and held. The housing 1 is closed by a cover supporting the emblem 4. The light guides 10.2, 10.3, 10.4, 10.5, 10.6 and 10.7 are also attached to the support 11.

[0042] Light guides 10.2, 10.3, 10.4, 10.5, 10.6, and 10.7 have an overall elongated shape along the Y-axis, specifically a bar-like shape. As we will see later, each light guide has the advantage of cooperating with a light source whose light-emitting axis is perpendicular to the axis along which the light guide extends, while maintaining a minimal footprint along the light-emitting axis. The lighting device 5 thus has a particularly small footprint along the X-axis. This is advantageous because the space available for housing lighting devices in a motor vehicle is always very limited, especially at the front or rear of such a vehicle.

[0043] The six light guides 10.2, 10.3, 10.4, 10.5, 10.6, and 10.7 may have an identical or similar shape, at least with regard to their advantageous characteristics. Therefore, in the following description, a particular light guide will be described, in this case, light guide 10.5.

[0044] The light guide 10.5 is illustrated in figures 5 to 8. The light guide 10.5 is a one-piece optical component, made of transparent material, configured to guide light rays RL produced by the light source 10.5. The light guide may in particular be an element made of transparent plastic, for example obtained by molding.

[0045] With reference to Figure 7, the light guide 10.5 includes an entrance surface 13, or coupler 13, for receiving the light rays RL produced by the light source 8.5. The entrance surface 13 is preferably a flat surface, oriented perpendicular or substantially perpendicular to the light emission axis X1 of the light source 8.5. In this case, the entrance surface is globally parallel to the Y and Z axes, while the light emission axis X1 of the light source 8.5 is globally parallel to the X axis. Alternatively, the entrance surface 13 could form an angle other than 90° with the light emission axis X1 of the light source 8.5, preferably an angle between 75° and 105°, possibly between 60° and 120°, or even between 45° and 135°. The input surface is positioned at a short distance from the light source 8.2, for example less than 5mm from the light source 8.2

[0046] The light guide 10.5 also includes a light ray guiding portion 14. This portion is designed to guide light rays RL by reflection off its walls. When a light ray RL reaches a wall of the guiding portion, it is either reflected and continues its path within the portion, or it is transmitted out of the portion and becomes visible to an external observer. The guiding portion 14 extends primarily along an extension axis Y1. The entrance surface 13 is positioned at one end of the guiding portion 14. Light rays reaching a second end of the guiding portion 14, opposite the first end, can be directed towards a light well or reflected back through the guiding portion in the opposite direction.

[0047] The guide section 14 may have a straight shape. In this case, the extension axis Y1 is parallel to the guide section 14. Alternatively, the guide section 14 may have a slightly curved shape, for example, to conform to the shape of the motor vehicle. In this case, the extension axis can be defined as the axis connecting the two opposite ends of the light guide 10.5.

[0048] In this case, the extension axis Y1 is generally parallel to the Y-axis. Therefore, the extension axis Y1 is generally perpendicular to the light emission axis X1. Alternatively, the angle formed between the extension axis Y1 and the light emission axis X1 could be different from 90°, preferably between 75° and 105°, or even between 60° and 120°, or even between 45° and 135°. Generally speaking, the light emission axis X1 forms a non-zero angle with the extension axis Y1.

[0049] The extension axis Y1 is also parallel or substantially parallel to the input surface 13. Alternatively, the extension axis Y1 could form a non-zero angle with the input surface 13, preferably an angle less than or equal to 30°, or even less than or equal to 10°, or even less than or equal to 5°.

[0050] A cross-section of the guiding portion 14 may have a circular or generally circular contour. The cross-section of the guiding portion may be constant or substantially constant, that is, the light guide does not widen or narrow when traversed from one end to the other.

[0051] The guiding portion 14 may advantageously include a mixing zone 15 configured to mix the light rays from the light source and thus obtain a homogeneous illuminated appearance of the guiding portion. The mixing zone 15 may be located at the end of the guiding portion 14 opposite the reflecting surface 16. The cross-section of the guiding portion at the mixing zone 15 may have a plurality of adjacent, rounded lobes. The cross-section of the guiding portion may thus have a daisy-like shape. The mixing zone 15 may optionally be masked by a bodywork element, so that only the portion of the guiding portion 14 extending beyond the mixing zone 15 is visible.

[0052] According to a particularly original aspect of the invention, the light guide 10.5 comprises an internal reflecting surface 16 for the light rays emitted by the light source, the reflecting surface comprising a plurality of adjacent facets 17A, 17B, 17C, 17D. The reflecting surface 16 is intended to reflect light rays RL propagating inside the light guide 10.5 towards a convergence zone ZC positioned in the guiding portion 14. Each facet 17A, 17B, 17C, 17D may be planar or extend around a mean plane. Each facet is a discrete and individual element of the reflecting surface. The boundaries of each facet may be materialized by edges.

[0053] Advantageously, each facet has a different orientation relative to its neighbors. When the facets are planar, two neighboring facets have different orientations when they form a non-zero angle with each other, or in other words, when the planes in which they respectively extend are intersecting planes. If the facets are not perfectly planar, two neighboring facets form a non-zero angle with each other when the mean planes in which they respectively extend are intersecting planes.

[0054] Alternatively or in addition, two adjacent facets may be offset from one another. Two facets are said to be offset from one another when a step is formed between them. The reflecting surface 16 then includes a connecting wall 18, or riser, linking two adjacent facets that are offset from one another. The connecting walls 18 may be oriented at least roughly parallel to the light emission axis X1.

[0055] Each facet 17A, 17B, 17C, 17D is therefore configured to reflect the light rays from the light source 8.5 towards the convergence zone ZC positioned in the guiding section 14, and specifically towards the mixing zone 15 of the guiding section 14. It is thus understood that the reflection surface 16 is positioned between the entrance surface 13 and the guiding section 14, following the direction of propagation of the light rays. The reflection surface 16 corresponds to the first surface of the light guide against which the light rays are reflected. Preferably, the reflection surface is configured so as to be reached by most of the light rays from the light source, that is, by at least 50% of the light rays from the light source, or even at least 80% of the rays from the light source.The presence of a faceted surface on the reflecting surface 16 helps to prevent or limit light leakage from the light guide compared to a reflecting surface with the same general shape but without facets. Light rays are reflected in a greater proportion compared to a light guide with a reflecting surface lacking the facets defined above. Furthermore, the facets allow for mixing, or blending, the light rays from the light source, thus improving the luminous homogeneity of the light guide.

[0056] Preferably, each facet comprises a polygonal shape, in particular a quadrilateral shape, preferably a rectangle. As can be clearly seen in Figure 8, the facets, when projected onto a plane parallel to the input surface 13, form a grid. Each facet thus comprises four adjacent facets, except for the facets arranged at the edges of the reflecting surface, which comprise only three adjacent facets, and except for the facets arranged at the corners of the reflecting surface, which comprise only two adjacent facets. According to an alternative embodiment, the facets could comprise a different polygonal shape, for example, a triangle, a pentagon, or a hexagon.

[0057] Each facet 17A, 17B, 17C, 17D preferably comprises a quadrilateral shape, in particular a rectangular shape, each side of which measures between 0.5 mm and 3 mm inclusive, for example between 0.5 mm and 2 mm inclusive. In particular, each facet 17A, 17B, 17C, 17D may comprise a square shape, each side of which measures between 0.5 mm and 3 mm inclusive, for example between 0.5 mm and 2 mm inclusive, preferably between 0.8 mm and 1.2 mm inclusive.

[0058] In this case, the reflecting surface 16 comprises approximately thirty-two facets. This number could be different. Preferably, the reflecting surface comprises between ten and fifty facets inclusive, or even between twenty and forty facets inclusive. This allows for a relatively simple manufacturing process while producing fairly efficient mixing of the light rays.

[0059] The reflecting surface 16 has a general shape based on a predetermined base surface, and each facet of the reflecting surface is formed by a local modification of said predetermined base surface. The local modification may consist of faceting the base surface. In this case, the base surface is a parabolic or paraboloid surface. The reflecting surface therefore comprises a parabolic carrier surface PP along which the various facets are arranged. Such an arrangement allows the light rays to converge in the convergence zone ZC, or focal zone.

[0060] The convergence zone ZC is not a point but nevertheless corresponds to a limited area compared to the volume of the light guide, and particularly compared to the volume of the mixing zone. A transverse surface ST1 of the convergence zone ZC can be defined as the largest surface of the convergence zone projected onto a plane perpendicular to the extension axis Y1. This transverse surface ST1 can have at least a roughly circular shape and is identified by dashed lines in Figures 6 and 7. Similarly, a transverse surface ST2 of the guiding portion 14 can be defined as a projection of the guiding portion onto a plane perpendicular to the extension axis Y1. Surfaces ST1 and ST2 are coplanar. According to the embodiment presented, the transverse surface ST1 is at most equal to one-third of the transverse surface ST2, preferably at most equal to one-quarter of the transverse surface ST2.Furthermore, the transverse surface ST1 is positioned approximately at the center of the transverse surface ST2. Thus, the rays reflected by the reflecting surface 16 are relatively concentrated at the center of the light guide. These light rays nevertheless have different angles of incidence since they originate from different facets. Such a positioning of the convergence zone allows for efficient mixing of the light rays while preventing light leakage. When the light source 8.2 is switched on, it emits light rays RL arranged into a beam centered on the emission axis X1. These light rays enter the light guide through the entrance surface 13. The light rays are then reflected towards the convergence zone ZC by all the facets of the reflecting surface 16, which produces an initial mixing of the light rays.Next, the light rays pass through the mixing zone 15, which produces a second mixing of the light rays. Finally, the light rays travel along the rest of the guiding section 14. Either the light rays are reflected off the walls of the guiding section and continue their path within the light guide, or the light rays are diffused outwards from the light guide.

[0061] This results in a light guide that produces a homogeneous illuminated appearance. The light appearance of the light guide is essentially the same as that which would have been obtained using a light source with an emission axis parallel to the extension axis of the light guide. The light guide and the lighting device equipped with this light guide are particularly compact in the direction of light emission. Such a lighting device is advantageously integrated into the front or rear of a vehicle to produce illuminated strips while occupying a small space along the longitudinal axis of the vehicle. Advantageously, the light source cooperating with the light guide can be connected to a printed circuit board extending parallel to the extension axis of the light guide.This is particularly useful when a second light source is connected to the same printed circuit board to produce lighting or illumination in a direction perpendicular to the plane in which the circuit board extends, for example, to backlight an emblem. The invention thus allows the use of a single printed circuit board supporting the different light sources of the lighting device.

Claims

DEMANDS 1. Light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) for motor vehicle comprising a light ray (RL) guiding portion (14) extending mainly along an extension axis (Y1), and an inlet surface (13), the inlet surface being intended to receive light rays emitted by a first light source (8.2, 8.3, 8.4, 8.5, 8.6, 8.7) centered on a first emission axis (X1), the first emission axis being perpendicular or substantially perpendicular to the extension axis, the light guide comprising an internal reflection surface (16) for the light rays emitted by the light source, the reflection surface comprising a plurality of adjacent facets (17A, 17B, 17C, 17D), each facet comprising a different orientation from the neighboring facets and / or each facet being offset from the neighboring facets, each facet being configured to reflect the light rays from the light source towards a convergence zone (ZC) positioned in said portion of the guide.

2. Light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) according to the preceding claim, characterized in that: - each facet (17A, 17B, 17C, 17D) is flat, and / or - each facet (17A, 17B, 17C, 17D) includes a polygonal shape, in particular a quadrilateral shape, and / or - each facet (17A, 17B, 17C, 17D) comprises a quadrilateral shape with each side measuring between 0.5mm and 3mm inclusive, in particular each facet (17A, 17B, 170, 17D) comprises a square shape with each side measuring between 0.8mm and 1.2mm inclusive.

3. Light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) according to any one of the preceding claims, characterized in that the reflecting surface (16) comprises a parabolic carrier surface (PP), each facet resulting from a local modification of the load-bearing surface.

4. Light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) according to any one of the preceding claims, characterized in that: - the convergence zone (ZC) comprises a transverse surface (ST1) at most equal to one-third of a transverse surface (ST2) of said guidance portion (14), and / or - the convergence zone (ZC) is positioned substantially at the center of a cross-section of said guide portion (14), and / or - the guiding portion (14) includes a light ray mixing zone (15), the convergence zone (ZC) being positioned inside the mixing zone.

5. Light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) according to any one of the preceding claims, characterized in that: - the inlet surface (13) is flat, and / or - the inlet surface (13) forms an angle of less than or equal to 30° with the extension axis (Y1), or even less than or equal to 10°, or even less than or equal to 5°, and / or - the inlet surface (13) forms with the first emission axis (X1) an angle of at least 45°, or even substantially equal to 90°.

6. Lighting device (5) for motor vehicle comprising a first light source (8.2, 8.3, 8.4, 8.5, 8.6, 8.7) and a light guide (10.2, 10.3, 10.4, 10.5, 10.6, 10.7) according to any one of the preceding claims, the first light source being arranged to illuminate the entrance surface (13) of the light guide, the first light source comprising a first emission axis (X1) of light extending perpendicularly or substantially perpendicularly to the extension axis (Y1) of the guiding portion of the light guide.

7. A lighting device (5) according to the preceding claim, further comprising: - a second light source (8.1) comprising a second light emission axis parallel to the first light emission axis (X1), and - an optical element such as an optical lens or an optical mask extending in front of the second light source along the second axis of light emission.

8. Lighting device according to the preceding claim, characterized in that said optical element comprises an emblem (4) for a motor vehicle.

9. A lighting device according to claim 7 or 8, characterized in that the first light source (8.2, 8.3, 8.4, 8.5, 8.6, 8.7) and the second light source (8.1) are electrically connected to the same printed circuit board (9).

10. A front (1) or rear face for a motor vehicle comprising a lighting device (5) according to any one of claims 6 to 9.

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