Lighting device for a motor vehicle
By designing the first and second light deflecting surfaces in the light guide and utilizing two reflections to realize light imaging, the problems of optical errors and non-flat light output surfaces in motor vehicle lighting devices are solved, clear light-dark boundaries and uniform light distribution are achieved, and manufacturing costs are reduced.
Patent Information
- Application Number
- CN202510256094.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-03-21
- Filing Date
- 2025-03-05
- Publication Date
- 2025-09-23
AI Technical Summary
In existing motor vehicle lighting devices, optical errors cause color errors and undesirable optical effects, and the design of the light emitting surface is limited by a non-flat structure.
The first and second light deflection surfaces are formed in the light guide to form a deflection system, and light imaging is achieved by using two reflections. The light exit surface remains flat, and the light and dark boundaries are formed by the design of the first cutting curve and the second cutting curve to avoid refraction of optical elements.
Reduce or eliminate color errors, keep the light exit surface flat, achieve clear light and dark boundaries and uniform light distribution, and reduce manufacturing costs.
Smart Images
Figure CN120684675A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a lighting device for a motor vehicle, wherein the lighting device comprises:
[0002] - a light source configured to emit light;
[0003] a transparent light guide arranged to image the light emitted by the light source into a light distribution; and
[0004] a light coupling-in region, which is provided for coupling light emitted by the light source into the light guide,
[0005] The light guide has a first light deflecting surface on the upper side, a second light deflecting surface on the lower side, and a light exit surface.
[0006] wherein light emitted by a light source and coupled into the light guide via a light coupling-in region propagates in the light guide as a first light beam in a first light propagation direction, wherein the light guide has, for example on the underside, an edge running transversely to the first light propagation direction, and
[0007] wherein after the edge the light propagates as a second light beam in a second light propagation direction to the first light deflecting surface, wherein the second light propagation direction has the same direction as the first light propagation direction, and
[0008] The light is deflected as a third light beam by the first light deflecting surface to the second light deflecting surface, and as a fourth light beam by the second light deflecting surface to the light exit surface, is emitted as a fifth light beam through the light exit surface, and is imaged as a light distribution into the area in front of the light guide. Background Art
[0009] Illuminating devices for use in motor vehicles or in motor vehicle headlights to generate light distributions are known from the prior art. Typically, light emitted by a light source is coupled into an optical body, such as a light guide. This light guide is, for example, a body made of an optically transparent material, wherein the coupled-in light propagates to a light exit surface, exits the light guide via the light exit surface, and is radiated into the area in front of the lighting device, in particular in front of a motor vehicle headlight or in front of the motor vehicle, where it forms a light distribution.
[0010] Typically, a diaphragm element is arranged in the light propagation path, which blocks a portion of the coupled-in light so that, if the diaphragm element is positioned appropriately, its edge is "imaged" as a light-dark boundary delimiting the light distribution, or becomes visible as a light-dark boundary. For example, a low-beam beam distribution can be generated in this way.
[0011] The diaphragm element is usually designed as an edge in the light guide that runs transversely to the light propagation path.
[0012] In order to image the light emitted from the light guide into a light distribution, it is usually provided that a projection lens is arranged immediately adjacent to the light exit surface of the light guide, and the projection lens images the emitted light into a light distribution. Here, the projection lens is usually arranged at a certain distance from the light exit surface.
[0013] A disadvantage of this embodiment is that due to the emission from the optical body into another medium, in particular air, and re-entry into the projection lens, optical errors, in particular color errors, occur, which are reflected as undesirable optical effects in the light pattern.
[0014] It is also possible to provide for the light exit surface to be correspondingly curved to fulfill the function of a projection lens. In this case, no light exits the light guide. However, for design reasons, vehicle manufacturers increasingly prefer that the light exit surface of such lighting devices be flat. Summary of the Invention
[0015] The object of the present invention is to provide a lighting device with a light guide, in which the above-mentioned disadvantages are reduced or eliminated.
[0016] This object is achieved with a lighting device as described in the introduction, wherein, according to the invention, in a section or sections through the light guide along one or more perpendicular cutting planes running parallel to the first light propagation direction or parallel to the perpendicular longitudinal middle plane, the first light deflecting surface forms a first cutting curve in the one or more cutting planes and the second light deflecting surface forms a second cutting curve, wherein
[0017] the first cutting curve is convexly or concavely curved and has the shape of a branch of a hyperbola, wherein the focus of the hyperbola is located outside the light guide in a region of the light guide facing away from the second light deflecting surface, and wherein
[0018] the second cutting curve is convexly curved and has a parabolic shape with a focus, wherein the focus of the parabola coincides with a focus of the first cutting curve outside the light-guiding body in a region of the light-guiding body facing away from the second light-deflecting surface,
[0019] Moreover, the total focus of the deflection system formed by the first deflection surface and the second deflection surface is arranged at the edge or in the area of the edge within the one or more cutting planes, so that the deflection system composed of the first deflection surface and the second deflection surface images the light emitted by the light source into a light distribution with a light-dark boundary, which limits the light distribution, especially limits the light distribution upward, wherein the light-dark boundary, especially the shape and / or orientation of the light-dark boundary, is determined by the edge, and wherein the light exit surface is constructed flat.
[0020] The term "light propagation direction" refers to the direction in which the light rays of each light beam are combined.
[0021] According to the present invention, the two deflecting surfaces together function like projection lenses and produce the desired light image. The light exit surface of the light guide can be designed to be flat, since the imaging function is solely performed by the two deflecting surfaces (i.e., the imaging system). Consequently, refractive optical elements in the imaging system can be avoided, since the imaging is achieved by means of two reflections. Furthermore, the refractive edge is formed within the light guide or bounds it, but not outside it. Thus, the lighting device according to the present invention can avoid color effects (chromatic aberration) while maintaining a flat light exit surface.
[0022] Further advantageous embodiments of the lighting device are described in the dependent claims.
[0023] It can be provided that the edge comprises one or more straight sections, wherein, for example in the case of two or more straight sections, these straight sections are arranged offset relative to one another in a direction, in particular a perpendicular direction.
[0024] A straight line design is a simple implementation, and offset portions can be used to achieve asymmetry of the light-dark boundary in the generated light distribution.
[0025] Preferably, provision can be made for the edge to be of curved design, wherein preferably the edge is located within the Petzval surface of the deflection system, tangentially to the Petzval surface of the deflection system, or in the vicinity of the Petzval surface.
[0026] In this respect, it can be provided that the edge comprises one or more parts, wherein, in the case of two or more parts, these parts are arranged offset with respect to one another in a direction, in particular a vertical direction, and thus, for example, serve to achieve an asymmetric light-dark boundary in the light distribution, which delimits the light distribution towards an upper limit.
[0027] It can be provided that in parallel vertical sections the first cutting curve and / or the second cutting curve have the same shape.
[0028] In other words, the curvature of the first cutting curve always looks the same in a plurality of spaced-apart sections, and the same is true for the curvature of the second cutting curve. Thus, the first and second deflecting surfaces or light guides are (mathematically) extruded in this region by the first and second cutting curves in the vertical section.
[0029] However, it can also be provided that in parallel vertical sections the first cutting curve and / or the second cutting curve have different shapes, in particular different curvatures, wherein for example the first and second deflection surfaces are each formed by rotating the first and second cutting curve about their respective axes of symmetry.
[0030] For example, starting from a vertical cutting curve corresponding to the longitudinal midplane, the first and second cutting curves are rotated around their corresponding hyperbolic symmetry axes (the connection of the two foci of the hyperbola) or parabolic symmetry axes (the straight line connecting the focus and vertex of the parabola).
[0031] It can be provided that the light coupling-in region is designed, for example, in the form of a collimator, so that the light emitted by the light source is aligned in the light guide essentially in the first light propagation direction, wherein in particular the first light beam is bundled in the region above the edge.
[0032] Correspondingly, the desired alignment of the light coupled into the light guide is achieved through the design of the light coupling-in region.
[0033] The coupled-in light thus moves along a first light propagation direction, wherein these light rays are preferably bundled, i.e., converge in the direction of the edge. For an ideal point light source, it may be provided that the light rays are focused at the edge or at a point on or near the edge. However, due to the actual size of the light source, light rays will also pass by the edge at a certain distance above the edge. These light rays passing from above illuminate the lower or lower area of the light distribution in the light distribution, and the closer these light rays pass to the edge, the higher they appear in the light pattern. The edge can be identified in the light pattern as a light-dark boundary, which delimits the light pattern toward an upper limit. After these light rays S1 are bundled and essentially aligned with the edge, the light distribution is brightest in the area of the light-dark boundary, and the highest illumination intensity values occur there.
[0034] Advantageously, the light coupling-in region and the light-guiding body are integrally connected to one another and are preferably formed from the same material.
[0035] In order to make the light emitted from the light guide body uniform, it may be provided that a buffer optical element is provided on the flat light exit surface.
[0036] Furthermore, the object is achieved by a lighting system comprising two or more lighting devices according to the present invention as described above.
[0037] For example, it is provided that two or more lighting devices are arranged laterally side by side, wherein, for example, the first light propagation directions are aligned parallel to each other in the light guide or are inclined at a certain angle relative to each other.
[0038] The lighting devices jointly generate a respective light distribution, which then together form a composite overall light distribution, for example a low-beam light distribution.
[0039] The light sources are preferably arranged in a row, in particular laterally alongside one another and transversely, in particular perpendicularly, to the first overall light propagation direction (=combination direction of the individual first light propagation directions).
[0040] Preferably, for this lighting system, the light guides of these lighting devices are integrally connected to each other.
[0041] It can be provided that these light guides, in particular the light exit surfaces, lead to a common, preferably flat, system light exit surface, or form the system light exit surface, wherein the system light exit surface is perpendicular to the longitudinal middle plane of one of the light guides or is inclined relative to the longitudinal middle plane, extending at an angle not equal to 0°, in particular a horizontal angle.
[0042] For example, the light exit surface opens into an upstream, light-guiding, in particular transparent body, which is preferably formed integrally with the light-conducting bodies and has a system light exit surface lying opposite the light exit surface.
[0043] The invention further relates to a headlight, in particular a motor vehicle headlight, comprising one or more lighting devices described above and / or one or more lighting systems described above.
[0044] Finally, the invention also relates to a vehicle, in particular a motor vehicle, wherein the vehicle has one or more lighting devices described above and / or one or more lighting systems described above and / or one or more headlights described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0045] The invention is explained in more detail below with reference to the accompanying exemplary drawings. In this context:
[0046] Figure 1 A lighting device according to the present invention is shown in a vertical cross-sectional view;
[0047] Figure 1a Shown Figure 1 Pay attention to the geometric aspects of the lighting fixtures;
[0048] Figure 1b Similar to Figure 1a The diagram shows Figure 1 or Figure 1a Variations of the lighting device in;
[0049] Figure 2 Shown in a perspective view from below Figure 1 Lighting devices in or similar to Figure 1 lighting devices in;
[0050] Figure 3 The perspective view from above shows the five Figure 1 lighting systems having lighting devices similar to those in the lighting devices;
[0051] Figure 4 Shown in a view from above Figure 3 lighting system in the
[0052] Figure 5 Shown in a view from above Figure 3 Variations of the lighting system in
[0053] Figure 6 Shown in a perspective view from above Figure 5 The illumination system of claim 1, wherein the illumination system has a buffer optical element on the light exit surface of the entire system;
[0054] Figure 7 Schematic diagram showing the use of Figure 1 Lighting devices in or Figure 3 or Figure 5 the light distribution produced by the individual lighting fixtures in; and
[0055] Figure 8 shows the use of Figure 3 、 Figure 5 or Figure 6 The overall light distribution produced by the lighting system shown in . DETAILED DESCRIPTION
[0056] Figure 1 The lighting device 1 is shown in a vertical section, wherein the lighting device comprises a light source 10, which is configured to emit light. The lighting device 1 also comprises a transparent light guide 100, which is configured to image the light emitted by the light source 10 into light distributions LV1-LV5. Figure 7 The corresponding light distribution LV1 is shown by way of example in FIG.
[0057] The light source may be, for example, one or more LEDs, but may also be a more complex arrangement of light-emitting elements.
[0058] The light guide 100 is a solid body made of a transparent material, such as Tarflon, in which light can propagate linearly.
[0059] The light guide 100 has a light coupling-in region 101, via which light emitted by the light source 10 is coupled into the light guide 100. The light coupling-in region 101 is a part of the light guide 100 or forms the light guide 100, and is integrally formed and made of the same material.
[0060] The light guide 100 has a first light deflecting surface 102 on an upper side 1100 , a second light deflecting surface 103 on a lower side 1200 , and a light exit surface 104 .
[0061] The light exit surface 104 is flat.
[0062] In this case, the terms “above” and “below” relate to a normal installation of the lighting device in a motor vehicle.
[0063] The light emitted by the light source 10 and coupled into the light guide 100 via the light coupling region 101 propagates in the light guide 100 as a first light beam (light ray S1 ) along a first light propagation direction Y1 .
[0064] On the underside 1200, the light guide 100 has an edge 105 that runs transversely to the light propagation direction Y1, typically at an angle of approximately 90°. The wording "approximately" is intended to indicate that the edge 105 does not necessarily have to run in a straight line, but can also be curved, or preferably curved, so that the angle between the edge 105 and the direction Y1 can vary locally.
[0065] The vertical section Ev shown runs perpendicular to the flat light exit surface 104 and / or parallel to the first light propagation direction Y1. For example, the vertical section Ev is the longitudinal middle plane LEM of the light guide 1. For the nomenclature of sections and planes, see also the description of the lighting system comprising a plurality of lighting devices according to the present invention. Figure 4 and Figure 5 .
[0066] Here, Figure 1 、 Figure 1a and Figure 1b The lighting device 1 is shown in an installed position in a motor vehicle. In the examples shown in these figures, the flat light exit surface 104 is perpendicular to the horizontal plane. In real life, there may be a certain inclination of the light exit surface relative to the horizontal plane, but this does not change the meaning of terms such as "above" and "below".
[0067] After the edge 105, the light propagates as a second light beam (ray S2) along a second light propagation direction Y2 to the first light deflecting surface 102, wherein the second light propagation direction Y2 is the same as the first light propagation direction Y1.
[0068] On the first light deflecting surface 102, the incident light S2 is totally reflected and deflected as a third light beam (light ray S3) toward the third light deflection direction Y3 to the second light deflecting surface 103. On the second light deflecting surface 103, the incident light S3 is again totally reflected and deflected as a fourth light beam (light ray S4, fourth light propagation direction Y4) toward the light exit surface 104. These light beams are emitted from the light guide via the light exit surface 104 as a fifth light beam (light ray S5, fifth light propagation direction Y5) and are imaged as light distributions LV1-LV5 into the area in front of the light guide 100 or in front of the vehicle.
[0069] The edge 105 (also called the "aperture edge") is formed by two surfaces 150, 151 on the underside 1200 of the light guide 100, which delimit the light guide to the outside ("boundary surfaces"), wherein the two boundary surfaces 150, 151 merge in the edge 105. In the example shown, the surface 151 passes via a further boundary surface 152 into the second deflecting surface 103, but a direct transition is also possible; this will not be discussed further at this point, since this region is of secondary or irrelevant importance for the operating principle.
[0070] In the front region of the surface 1100 of the light guide 100 , a boundary surface 154 is also shown, which, however, is likewise not described in detail since it is likewise of secondary or irrelevant importance for the function of the invention.
[0071] If you observe Figure 1 In the vertical section, in the section passing through the light guide 100 parallel to the first light propagation direction Y1, the first light deflecting surface 102 forms a first cutting curve K102, and the second light deflecting surface 103 forms a second cutting curve K103.
[0072] In this example, the first cutting curve K102 is concavely curved and has the shape of a branch of a hyperbola. The focus F102 of the hyperbola, for which see Figure 1a , outside the light guide 100 , in a region of the light guide 100 facing away from the second light deflecting surface 103 .
[0073] The second cutting curve K103 is convexly curved and has a parabola shape with a focus F103 , wherein the focus F103 of the parabola coincides with the focus F102 of the first cutting curve K102 outside the light guide 100 in a region of the light guide 100 facing away from the second light deflecting surface 103 .
[0074] The second cutting curve K103 is convexly curved when looking at the light guide 100. From the perspective of the light rays propagating in the light guide 100, the second cutting curve K103 is concavely curved, ie the (total reflection) surface or cutting curve K102 acts as a concave mirror for said light beam.
[0075] In accordance with Figure 1 and Figure 1a In the example of FIG. 1 , the first cutting curve K102 is concavely curved. From the perspective of light moving in the light guide 100 , the concave first cutting curve K102 is convex.
[0076] The second focus F103' of the hyperbola forms the overall focus F200 of the deflection system 200, which is formed by the first cutting curve K102 and the second cutting curve K103, in the illustrated cutting plane. The overall focus F200 is located in the region of the edge 105, either at the edge, above the edge 105 in the light guide 100, or, as roughly schematically illustrated, outside the light guide 100 below the edge 105, in particular slightly below the edge.
[0077] Deflection system 200, consisting of first and second deflection surfaces 102 and 103, images the light emitted by light source 10 into light distributions LV1-LV5. Because edge 105 is located within or near focal point F200 of the entire system, it is imaged in the light distribution as a sharp light-dark boundary HD, which delimits light distributions LV1-LV5 in the upward direction. The shape of edge 105 determines the shape of boundary HD.
[0078] Figure 1a Also shown are the symmetry axis SA102 of the hyperbola and the symmetry axis SA103 of the parabola. The symmetry axis SA102 of the hyperbola passes through the two foci F103, F103' (= F200) of the hyperbola.
[0079] In particular, the focal point F103 ′ / F200 is located in the focal plane or Petzval surface of the deflection system or imaging system 200 .
[0080] The symmetry axis SA103 of the parabola intersects the focus F103 of the hyperbola. It can be provided that the symmetry axis SA103 runs parallel to the light emission direction (main radiation direction) of the light source.
[0081] Thus, the deflection system or imaging system 200 forms a positive lens or a converging lens.
[0082] The term "light propagation direction" refers to the direction in which the light rays of each light beam are combined.
[0083] It can be provided that the edge 105 comprises one or more straight sections, wherein, for example when there are two or more straight sections, these straight sections are arranged offset from one another in one direction, in particular in the vertical direction. Typically, the edge or a portion thereof is located in a horizontal plane.
[0084] Preferably, provision can be made for the edge 105 to be of curved design, wherein preferably the edge is located within the Petzval surface of the deflection system 200 , tangentially to the Petzval surface of the deflection system 200 , or in the vicinity of the Petzval surface.
[0085] exist Figure 2 In the figure, a perspective view from obliquely below is shown with a Figure 1 In or similar to Figure 1 1 . Here, it can be seen that the aperture edge 105 consists of two parts that are perpendicularly offset from each other and are connected by another part that runs at an angle. This way, an asymmetry of the light-dark boundary HDG of the light distributions LV1-LV5 can be achieved. Figure 2 The position of the focal point F200 of the deflection system 200 is also schematically shown.
[0086] For example, the two deflection surfaces are produced in that the first cutting curve and / or the second cutting curve have the same shape in parallel vertical cross-sections.
[0087] However, it is preferably provided that in the parallel vertical section planes Ev, the first cutting curve K102 and the second cutting curve K103 have different shapes, in particular different curvatures, and that the first and second deflection surfaces 102, 103 are formed by a rotation of the first and second cutting curves K102, K103, respectively, about their respective axes of symmetry SA102, SA103, for example about respective axes of symmetry SA102, SA103 in a vertical longitudinal mid-plane, as Figure 1a Similar considerations apply to Figure 1b , which will be discussed below.
[0088] The light coupling-in region 101 is preferably configured as a collimator, in particular a TIR collimator, which aligns the light rays fed into the light coupling-in region 101 by the light source 10 by means of total internal reflection. The light coupling-in region 101 or the TIR collimator aligns the light rays in the first light propagation direction Y1. Preferably, these light rays S1 are bundled in the direction of the aperture edge 105.
[0089] The coupled-in light thus moves along a first light propagation direction Y1, with the light rays S1 preferably being bundled, i.e., converging in the direction of the edge 105. For an ideal point light source, it would be provided that the light rays are focused into the edge or onto a point on or near the edge. However, due to the actual spatial dimensions of the light source 10, light rays also pass by the edge at a certain distance above it. These light rays passing from above illuminate the area below the light-dark boundary HDG or the lower area of the light distribution LV1–LV5 in the light distribution. The closer these light rays pass to the edge 105, the higher they appear in the light pattern. The edge 105 can be identified in the light pattern as a light-dark boundary HDG, which delimits the light pattern toward an upper limit. After the light rays S1 are bundled and essentially aligned with the edge, the light distribution is brightest in the area of the light-dark boundary, and the highest illumination intensity values occur there.
[0090] Figure 1b Shown with Figure 1 and Figure 1a The lighting device in is similar to lighting device 1. Figure 1b The difference between the designs in FIG1 and FIG2 is that the first cutting curve K102 is convex in this example, but has a branch shape of a hyperbola. The focus F102 of the hyperbola is located outside the light guide 100 in the area of the light guide 100 away from the second light deflecting surface 103. Other relationships are similar to Figure 1a , so it is not discussed further here.
[0091] The differences between these implementations are mainly as follows: Figure 1 In the embodiment of / 1a, the intermediate image in the focus F103 is reduced, and Figure 1b In an embodiment, the intermediate image is magnified.
[0092] Figure 3 and Figure 4 A lighting system 1000 is shown, comprising five lighting devices 1 according to the present invention. These lighting devices are arranged side by side and integrally connected to one another. Each of these lighting devices has a vertical longitudinal midplane Ev; these vertical longitudinal midplanes can run parallel to one another, but are preferably arranged at an angle relative to one another so that, viewed in the light propagation direction Y1, the longitudinal midplanes intersect in front of the lighting system. Due to the inclination of the respective longitudinal midplanes lem; Ev relative to one another, the light distributions LV1–LV5 are as follows: Figure 8 The images shown in FIG are laterally offset from one another so that the desired width of the light pattern can be achieved. Adjacent light distributions preferably overlap.
[0093] Therefore, these lighting devices each generate light distributions LV1-LV5, which then together form a composite overall light distribution LV, for example, a low-beam light distribution LV. Figure 8 This overall light distribution is schematically shown in FIG.
[0094] The light sources 10 may be arranged in a row, in particular side by side.
[0095] The light guides 100, in particular their light exit surfaces 104, lead to a common, preferably planar, system light exit surface 1410. In the example shown, the system light exit surface 1410 is perpendicular to the longitudinal middle plane LEM, in particular the longitudinal middle plane LEM of the central light guide 100.
[0096] Figure 5 and Figure 6 A substantially similar lighting system 1000 is shown, in which, however, the system light exit surface 1410 extends obliquely relative to the longitudinal middle plane LEM, at an angle α not equal to 0°.
[0097] As shown, the light exit surface 104 in both examples preferably leads to an upstream, light-guiding, in particular transparent body 1400 , preferably constructed integrally with the light guides 100 , which has a system light exit surface 1410 opposite the light exit surface 104 .
[0098] In order to make the light emitted from the light guide or the system light exit surface 1410 uniform, it can be provided that a buffer optical element 1420 is provided on the flat light exit surface. Figure 6 Of course, this buffer optical element 1420 is not limited to Figure 6 implementation method.
[0099] A significant advantage of the lighting device or lighting system according to the invention is that the edge of the deflection system / aperture edge is located within the light guide. The light coupling-in region, in particular the TIR collimator, the deflection system, and the aperture edge can be formed in a single body, eliminating the air gaps that are unavoidable in lens designs.
[0100] This significantly reduces manufacturing costs, as a projection lens and no tooling are required. When using a lens, light must pass through four optical media: once from the light source through air to the TIR collimator material, then from the collimator material to air, once again from air to the lens material, and finally from the lens material to air. By removing the lens from the design, half of these transitions are eliminated, which has a positive impact on the design's performance.
Claims
1. A lighting device (1) for a motor vehicle, wherein: The lighting device (1) comprises: - a light source (10) configured to emit light; - a transparent light guide (100) configured to image the light emitted by the light source (10) into a light distribution (LV1-LV5); and a light coupling-in region (101) configured to couple light emitted by the light source (10) into the light guide (100), in The light guide (100) has a first light deflecting surface (102) on the upper side (1100), a second light deflecting surface (103) on the lower side (1200), and a light exit surface (104), wherein Light emitted by the light source (10) and coupled into the light guide (100) via the light coupling-in region (101) propagates in the light guide (100) as a first light beam (S1) along a first light propagation direction (Y1), wherein the light guide (100) has, for example on the underside (1200), an edge (105) extending transversely to the first light propagation direction (Y1), and wherein After the edge (105), the light propagates as a second light beam (S2) along a second light propagation direction (Y2) to the first light deflecting surface (102), wherein the second light propagation direction (Y2) has the same direction as the first light propagation direction (Y1), and The light is deflected by the first light deflecting surface (102) as a third light beam (S3) to the second light deflecting surface (103), and is deflected by the second light deflecting surface (103) as a fourth light beam (S4) to the light exit surface (104), is emitted via the light exit surface (104) as a fifth light beam (S5), and is imaged as a light distribution (LV1-LV5) into an area in front of the light guide (100). It is characterized by: In one or more cross-sections passing through the light guide (100) along one or more vertical cutting planes (Ev) running parallel to the first light propagation direction (Y1) or parallel to a vertical longitudinal median plane (LEM), the first light deflecting surface (102) forms a first cutting curve (K102) within the one or more cutting planes (Ev), and the second light deflecting surface (103) forms a second cutting curve (K103), wherein - the first cutting curve (K102) is convexly or concavely curved and has a branched shape of a hyperbola, wherein the focus (F102) of the hyperbola is located outside the light guide (100) in a region of the light guide (100) facing away from the second light deflecting surface (103), and wherein - the second cutting curve (K103) is convexly curved and has a parabola shape with a focus (F103), wherein the focus (F103) of the parabola coincides with a focus (F102) of the first cutting curve (K102) located outside the light guide (100) in a region of the light guide (100) facing away from the second light deflecting surface (103), Furthermore, the total focus (F200) of the deflection system (200) formed by the first deflection surface (102) and the second deflection surface (103) is arranged at the edge (105) or in the area of the edge (105) within the one or more cutting planes (Ev), so that the deflection system (200) composed of the first and second deflection surfaces (101, 102) images the light emitted by the light source (10) into a light distribution (LV1–LV5) having a light-dark boundary (HDG), wherein the light distribution (LV1–LV5) is limited, in particular, is limited upwardly, wherein the shape and / or orientation of the light-dark boundary (HDG), in particular, the light-dark boundary (HDG), is determined by the edge (105), and wherein the light exit surface (104) is constructed to be flat.
2. The lighting device according to claim 1, wherein The edge (105) comprises one or more straight sections, wherein, for example, in the case of two or more straight sections, the straight sections are arranged offset from one another in one direction, in particular in a vertical direction.
3. The lighting device according to claim 1, wherein The edge (105) is of curved design, wherein preferably the edge is located within the Petzval surface of the deflection system (200), is tangential to the Petzval surface of the deflection system (200), or is located in the vicinity of the Petzval surface.
4. The lighting device according to claim 3, wherein: The edge (105) comprises one or more sections, wherein, in the case of two or more sections, the straight sections are arranged offset from one another in one direction, in particular in a vertical direction.
5. The lighting device according to any one of the preceding claims, wherein: In parallel vertical cross sections (Ev), the first cutting curve (K102) and / or the second cutting curve (K103) have the same shape.
6. The lighting device according to any one of claims 1 to 4, wherein: In parallel vertical sections (Ev), the first cutting curve (K102) and / or the second cutting curve (K103) have different shapes, in particular different curvatures, wherein, for example, the first and second deflection surfaces (102, 103) are respectively formed by rotating the first and second cutting curves (K102, K103) around their respective axes of symmetry.
7. The lighting device according to any one of the preceding claims, wherein: The light coupling-in region (101) is configured, for example, in the form of a collimator, so that the light emitted by the light source (10) is aligned in the light guide (100) essentially toward the first light propagation direction (Y1), wherein in particular the first light beam (S1) is bundled into a region above the edge (105).
8. The lighting device according to any one of the preceding claims, wherein: The light coupling-in region (101) and the light guide (100) are integrally connected to each other and are preferably formed of the same material.
9. The lighting device according to any one of the preceding claims, wherein: A buffer optical element is arranged on the flat light exit surface (104).
10. A lighting system (1000), comprising two or more lighting devices (1) according to any one of claims 1 to 9.
11. The lighting system according to claim 10, wherein: The lighting devices (1) are arranged side by side laterally, wherein, for example, the first light propagation directions (Y1) are oriented parallel to each other in the light guide (100), or are inclined at a certain angle relative to each other.
12. The lighting system according to claim 10 or 11, wherein: The light guides (100) of the lighting device (1) are integrally connected to each other.
13. The lighting system according to any one of claims 10 to 12, wherein: The light guide (100), for example its light exit surface (104), leads to a common, preferably flat system light exit surface (1410), or forms the system light exit surface, wherein the system light exit surface (1410) is perpendicular to a longitudinal middle plane (LEM) of one of the light guides (100) or is inclined relative to the longitudinal middle plane (LEM) at an angle (α) not equal to 0°, in particular a horizontal angle. 14 . A headlight, in particular a motor vehicle headlight, comprising one or more lighting devices according to claim 1 and / or comprising one or more lighting systems according to claim 10 .
15. A vehicle, in particular a motor vehicle, wherein: The vehicle comprises one or more lighting devices according to any one of claims 1 to 9 and / or one or more lighting systems according to any one of claims 10 to 13 or one or more headlights according to claim 14 .