Lighting arrangement with radar-transparent portion and curved light in-coupling surface

Abstract

The invention relates to a lighting arrangement (2), in particular for a motor vehicle, comprising: at least a plurality of light sources (100a, 100b) for emitting light; a light-guiding portion (200) which in relation to an optical axis (4) of the lighting arrangement (2) is disposed radially outside a radar in-coupling surface (402) for coupling in radar waves (6) of a radar-transparent portion (400), and at least partially extends along an imaginary circumferential path (220), wherein the light-guiding portion (200) has at least one light in-coupling surface (202a, 202b) that is curved perpendicularly to the circumferential path (220) and intended for coupling in light from the at least one light source (100a, 100b), wherein the light-guiding portion (200) guides the in-coupled light (102a, 102b) from the light in-coupling surface (202, 202a, 202b) towards a light transition zone (300) between the light-guiding portion (200) and the radar-transparent portion (400), and wherein the light-guiding portion (200) on the side facing the light transition zone (300) has a light-guiding surface (206) formed by a convex outer contour (204) pointing away from an optical axis (4) of the lighting arrangement (2) and a light-guiding surface (210) formed by an inner contour (208) facing towards the optical axis (4), wherein the curved light in-coupling surface (202, 202a, 202b) joins a starting point (216) of the convex outer contour (204) and a starting point (218) of the inner contour (208); and the radar-transparent portion (400), having the radar in-coupling surface (402) for coupling in the radar waves (6) and having an out-coupling surface (404) for coupling out the in-coupled radar waves (6) and for emitting a light distribution (1064) depending on the light (104) injected into the inner radar-transparent portion (400) by way of the light-guiding portion (200).

Description

[0001] Description

[0002] title

[0003] Lighting device with radar-transparent section and curved light coupling surface

[0004] State of the art

[0005] The invention relates to a lighting device with a radar-transparent section for a motor vehicle.

[0006] Disclosure of the invention

[0007] When designing a motor vehicle, the degree of design freedom is often limited by the available or specified installation space. This is especially true when it comes to accommodating driver assistance systems such as radar. If an aesthetic factor, such as logo illumination, also needs to be considered, the degree of design freedom is further reduced.

[0008] To ensure the best possible radar transparency, it is necessary to position a light source outside the radar cone. Furthermore, it is not possible to introduce geometric deviations within the radar cone, for example, through microlenses or coupling contours, without significantly affecting radar transparency.

[0009] No materials that significantly absorb radar radiation may be used in the radiation area of ​​the radar cone or in the detection beam path of the radar radiation. Furthermore, a transparent material must be used for an illuminated logo. Since electronic components and circuits are not transparent to radar radiation, these assemblies must be located outside the area through which the radar radiation propagates. Accordingly, radar-transparent illumination of a logo, for example, in a motor vehicle's front grille, is desirable. This allows for a uniform brightness of the logo and allows the light beam path in the illumination device to be influenced without significantly restricting the functionality of the radar device in the area of ​​the radar cone.

[0010] This object is achieved by a lighting device according to an independent claim.

[0011] One aspect of the description relates to the following subject matter: A lighting device, in particular for a motor vehicle, comprising at least one light source for emitting light; a light-guiding section which, with respect to an optical axis of the lighting device, is arranged outside, for example radially outside, a radar coupling surface for coupling in radar beams of a radar-transparent section and extends at least in sections along an imaginary circumferential path, wherein the light-guiding section comprises at least one curved light coupling surface for coupling in light from the at least one light source, wherein the light-guiding section guides the coupled-in light from the light coupling surface to a light transition region between the light-guiding section and the radar-transparent section,and wherein the light-guiding section has a light-guiding surface formed by a convex outer contour facing away from an optical axis of the illumination device toward the light transition region, and a light-guiding surface formed by the inner contour facing the optical axis, wherein the curved light-coupling surface connects the convex outer contour and the inner contour; and the radar-transparent section with the radar-coupling surface for coupling in the radar radiation and with an output surface for coupling out the coupled radar radiation and for emitting a light distribution dependent on the light introduced into the inner radar-transparent section by means of the light-guiding section.

[0012] The curved light coupling surface allows the light coupled into the light guide section to be influenced along its beam path within the light guide section. This creates additional design freedom, allowing the lighting system to be adapted to a given installation space without negatively affecting the light coupling.

[0013] An advantageous example is characterized in that the at least one light coupling surface is concavely curved towards the circumferential section.

[0014] The concavely curved light coupling surface shifts the first imaginary focal point of the concave light guide surface formed by the convex outer contour closer to the light coupling surface. This reduces the space required by the lighting device.

[0015] An advantageous example is characterized in that the at least one light coupling surface is convexly curved to the circumferential section.

[0016] The convexly curved light coupling surface collimates the light coupled into the light guide section. As a result, the coupled light hits the concave light guide surface farther away from the light source. This reduces the number of reflections in the light guide section.

[0017] An advantageous example is characterized in that the at least one light coupling surface is convexly curved along or parallel to the circumferential section.

[0018] The light coupling surface is curved along or parallel to the circumferential section, creating an additional dimension of curvature, which allows for further influence on the coupled light. This creates an additional degree of design freedom, increasing the flexibility of the lighting system and improving the influence on the coupled light.

[0019] An advantageous example is characterized in that the curved light coupling surface is arranged between two further light coupling surfaces for coupling in light from the at least one light source, wherein the light coupled in via the further light coupling surfaces strikes light-guiding surfaces which each enclose an angle with the associated further light coupling surface in a range between 30° and 50°, in particular 35° and 45°, in particular 40°. The further light coupling surfaces enable improved coupling of the light from the light source, since light emitted laterally from the light source is also coupled into the light-guiding section. This increases the brightness of the emitted light distribution of the lighting device.The additional light guide surfaces guide the light coupled in through the additional light coupling surfaces towards the light transition area, resulting in few reflections of the coupled light in the light guide section.

[0020] An advantageous example is characterized in that at least one of the further light-guiding surfaces has an elliptical concave contour.

[0021] By means of the elliptical concave contour of the further light-guiding surface, the number of reflections of the light coupled in through the further light coupling surfaces is further reduced.

[0022] An advantageous example is characterized in that the elliptical concave contour of the further light-guiding surface is designed such that a focal point of the elliptical concave contour lies in a vicinity of the at least one light source, in particular in the at least one light source.

[0023] By designing the further light-guiding surfaces with the focal point in the vicinity of the at least one light source, more light rays of the at least one light source are coupled into the light-guiding section, whereby the brightness of the light distribution of the lighting device is further increased.

[0024] An advantageous example is characterized by the fact that the two light coupling surfaces extend parallel to a main radiation direction of the light source.

[0025] The parallel light coupling surfaces enable easy demolding of the entire light guide section, thereby reducing production costs in the manufacture of the lighting device.

[0026] An advantageous example is characterized by the fact that the two adjacent light coupling surfaces extend at an angle of <5° to the main emission direction of the associated light source. This advantageously improves easy demolding in the mold. This applies if the demolding direction of the mold is parallel to the main emission direction of the LED.

[0027] An advantageous example is characterized by the fact that an optical axis of the light coupling surface coincides with the main radiation direction of the associated light source.

[0028] By aligning the optical axis of the light coupling surface to the main radiation direction of the associated light source, a symmetrical illumination of the radar-transparent section is created.

[0029] An advantageous example is characterized in that an optical axis of the light coupling surface deviates from the main radiation direction of the associated light source by a deviation.

[0030] By deviating the optical axis of the light coupling surface from the main beam direction, the illumination of the radar-transparent area can be directed. This creates additional design freedom, allowing the lighting system to be flexibly adapted to specific conditions, such as the installation space or a pattern to be illuminated in the radar-transparent area.

[0031] An advantageous example is characterized in that the deviation of the optical axis of the light coupling surface from the main emission direction of the associated light source varies along or parallel to the circumferential section.

[0032] As a result, a light cone of the light source is varied only in a tangential direction along the circumferential section and, if necessary, further reflections are avoided while maintaining the steerable illumination of the radar-transparent area by the light cone.

[0033] An advantageous example is characterized by groups of light sources being spaced apart along or parallel to the circumferential path, with the respective deviation increasing toward the light sources at the end of the group. This arrangement of the light sources creates a more homogeneous illumination of the radar-transparent area.

[0034] An advantageous example is characterized in that at least one region along the circumferential path, in particular two opposite regions along the circumferential path, is free of illuminants.

[0035] This allows the lighting system to be adapted even more flexibly to the installation space.

[0036] An advantageous example is characterized in that at least some of the plurality of adjacent light sources are equidistant from each other.

[0037] If the installation space allows this arrangement, a more homogeneous illumination of the radar-transparent area results without having to adjust the light coupling surface.

[0038] Further advantageous embodiments are apparent from the drawing and the following description. The drawing shows:

[0039] Figure 1 is a schematic representation of a section of a lighting device;

[0040] Figure 2 is a schematic representation of a plan view of the lighting device;

[0041] Figure 3 is a schematic representation of a section of a partial area of ​​a light guide section of the lighting device;

[0042] Figure 4 is a schematic representation of the section of an embodiment of the lighting device;

[0043] Figure 5 shows a schematic top view of an embodiment of the lighting device; Figure 6 shows a schematic top view of the embodiment of the lighting device;

[0044] Figure 7 shows a top view of an embodiment of the lighting device in a schematic representation;

[0045] Figure 8 is an isometric view of an embodiment of the lighting device;

[0046] Figure 9 is an isometric view of a portion of the embodiment of Figure 8.

[0047] Figure 1 shows a schematic representation of a lighting device 2, in particular for a motor vehicle, in a section AA. Figure 2 shows the lighting device 2 in a schematic representation in a plan view. The lighting device 2 comprises at least one light source 100a, 100b, in particular a plurality of light sources, for emitting light, a light-guiding section 200 which, with respect to an optical axis 4 of the lighting device 2, is arranged outside a radar coupling surface 402 for coupling in radar beams 6 of a radar-transparent section 400 and extends at least in sections along an imaginary circumferential section 220. The imaginary circumferential section 220 can, for example, be circular, polygonal, or designed as any desired line. The circumferential section 220 can be closed in itself or open in sections.In the example, the circumferential section 220 is essentially circular and self-contained. It can be provided that the circumferential section 220 is adapted to a predetermined installation space for the lighting device 2. This also allows the light-guiding section 200 to be adapted or adapted to the installation space.

[0048] In the example, the light source 100a, 100b is embodied as an LED. It can be provided that a plurality of LEDs are arranged on a circuit board and form the light source 100a, 100b. Furthermore, it can be provided that an LED strip forms the light source 100a, 100b. For example, the light source 100a, 100b is formed from a circuit board 122 with LEDs arranged thereon. It can be provided that the circuit board 122 is formed as a continuous or divided assembly. The LEDs arranged on the continuous and / or divided circuit board 122 can be arranged in groups of varying numbers and with varying or uniform spacing between the LEDs or the groups.

[0049] For example, it is intended that the LEDs can be supplied with different currents individually or in groups, arranged on a common or separate circuit board, in order to be able to adjust the homogeneity of the light distribution.

[0050] In the example, the LEDs of the light source 100a, 100b are arranged in a plane 108. It may be provided that the LEDs are arranged in different planes.

[0051] The light-guiding section 200 comprises at least one light coupling surface 202a, 202b, which is curved differently from the circumferential section 220, for coupling in light 102a, 102b from the at least one light source 100a, 100b. The curvature of the at least one light coupling surface 202a, 202b is thus curved relative to the circumferential section 220. This means that the at least one light coupling surface 202a, 202b is curved relative to an imaginary plane that runs parallel to an imaginary center plane of the circumferential section 220. The curvature of the circumferential section 220 differs from the curvature of the at least one light coupling surface 202a-202b at least in the position of the curvature.

[0052] The light-guiding section 200 guides the coupled light 102a, 102b from the light-coupling surface 202, 202a, 202b to a light transition region 300 between the light-guiding section 200 and the radar-transparent section 400. Furthermore, the light-guiding section 200 has a light-guiding surface 206 formed by a convex outer contour 204 facing away from an optical axis 4 of the illumination device 2 and a light-guiding surface 210 formed by an inner contour 208 facing the optical axis 4 toward the light transition region 300. The curvature of the convex outer contour 204 can be adapted to the specified installation space for the illumination device 2. Furthermore, it can be provided that the curvature of the convex outer contour 204 is different at corresponding points on the imaginary circumferential section 220.

[0053] The convex outer contour 204 can be designed in its basic form as an ellipse, which can be deformed into a free-form surface due to given conditions or a desired guidance of the light 102a.

[0054] The curved light coupling surface 202, 202a, 202b connects a starting point 216 of the convex outer contour 204 and a starting point 218 of the inner contour 208.

[0055] The lighting device 2 further comprises the radar-transparent section 400 with the radar coupling surface 402 for coupling in the radar radiation 6 and with a coupling-out surface 404 for coupling out the coupled radar radiation 6 and for emitting a light distribution 106 depending on the light 104 introduced into the inner radar-transparent section 400 by means of the light-guiding section 200.

[0056] The radar-transparent region 400 is also designed to couple incoming radar radiation into the radar-transparent region 400 at the coupling-out surface 404 and to couple it out at the radar coupling-in surface 402.

[0057] In the example, the radar radiation 6 is generated and processed by a radar device 8.

[0058] The at least one light coupling surface 200, 202b can be concavely curved, in particular perpendicular to the circumferential section 220. As a result, a first imaginary focal point 236 of the concave light-guiding surface 206 formed by the convex outer contour 204 is shifted closer to the light coupling surface 200, 202b. Thus, the at least one light source 100a, 100b can be arranged closer to the light-guiding section 200 without losses when coupling light from the light source 100a, 100b into the light-guiding section 200 through the light coupling surface 200, 200b. The concavely curved light coupling surface 202b is preferably used for emitted light distributions 104, which emit light essentially in an outer region around the optical axis 4.

[0059] The at least one light coupling surface 200, 202a can be further convexly curved, in particular perpendicular to the circumferential section 220. The light 102a coupled into the light-guiding section 200 through the convexly curved light coupling surface 202, 202a is thereby collimated. The coupled light 102a thus strikes the concave light-guiding surface 206 further away from the at least one light source 100a, 100b, thereby reducing the number of reflections in the light-guiding section 200. Furthermore, the properties of the concave light-guiding surface 206 are improved in an elliptical shape, and it requires less free-form deformation.

[0060] It can be provided that the light coupling surface 202, 202a, 202b is continuously convexly or concavely curved along the circumferential section 220 or is at least partially or sectionally concavely and / or convexly curved.

[0061] Figure 3 shows a schematic representation of a portion of the illumination device along a section BB, the course of which is schematically indicated in Figure 2. It can be provided that the at least one light-coupling surface 202, 202a is also convexly curved along or parallel to the circumferential section 220. In the example, the light entry surface 202, 202a, 202b in front of each light source 100a, 100b is rotationally symmetrically convex and / or concave. It can be provided that each of the light sources 100a, 100b has an associated light entry surface 202, 202a, 202b.

[0062] In the example, the curved light coupling surface 202, 202a, 202b is arranged between two further light coupling surfaces 222a, 222b for coupling in light from the at least one light source 100a, 100b. The light 116 coupled in via the further light coupling surfaces 222a, 222b strikes light-guiding surfaces 224a, 224b, which each enclose an angle 226 with the associated further light coupling surface 222a, 222b in a range between 30° and 50°, in particular 35° and 45°, in particular 40°.

[0063] An exemplary dimensioning of the light coupling surface 202, 202a, 202b, the further light coupling surfaces 222a, 222b, and the further light-guiding surfaces 224a, 224b, hereinafter referred to collectively as the coupling region for the sake of simplicity, has a spherically convexly curved light coupling surface 202, 202a with a radius 230 of 3.1 mm. The angle 226 between the further light coupling surface 222a, 222b and the further light-guiding surface 224a, 224b is 40°. An edge length 232 of the further light-guiding surface 224a, 224b is provided as 10 mm. A distance 234 between the opposing further light coupling surfaces corresponds to 5.8 mm in this example. In the example, the light source 100a, 100b is arranged at a distance 228 of 1.1 mm from the light coupling surface 202, 202a. The thickness of the light guide section can be 3 mm in the example.It can be provided that the dimensions described in the example are dimensioned differently for different coupling regions of the light guide section 200, for example due to predetermined installation space requirements or a desired configuration of the emitted light distribution 104. In addition, it is conceivable that the light coupling surface 202, 202a, 202b, the further light coupling surfaces 222a, 222b and the further light guide surfaces 224a, 224b are each designed differently from one another within a coupling region.

[0064] Depending on the nature of angle 226, not all of the light 116 entering through the light coupling surfaces 224a, 224b may strike the light guide surfaces 224a, 224b. However, a significant portion of the light 116 strikes the light guide surfaces 224a, 224b.

[0065] Light emitted laterally by the light source 100a, 100b is also coupled into the light-guiding section 200 via the additional light-coupling surfaces 222a, 222b and guided through the additional light-guiding surfaces 224a, 224b toward the light transition region 300. As a result, more emitted light from the light source 100a, 100b is coupled into the light-guiding section 200, thereby increasing the brightness of the emitted light distribution 106.

[0066] It is conceivable that at least one of the further light-guiding surfaces 224a, 224b has an elliptical, concave contour. The course of the light coupling through the further light-guiding surfaces 222a, 222b can be further influenced by dimensioning the elliptical, concave contour of the further light-guiding surfaces 222a, 222b. This further increases the influence on the emitted light distribution 104. For example, the elliptical, concave contour of the further light-guiding surface 224a, 224b can be configured such that an imaginary focal point of the elliptical, concave contour lies in the vicinity of the at least one light source 100a, 100b, in particular in the at least one light source 100a, 100b.

[0067] In the example, the two light coupling surfaces 222a, 222b extend parallel to a main beam direction 110 of the light source. It can be provided that the light coupling surfaces 222a, 222b are at least partially oriented at a predeterminable angle of inclination relative to the main beam direction 110 and / or have a concave or convex contour.

[0068] In the example, an optical axis 118 of the light coupling surface 202 coincides with the main emission direction 110 of the associated light source 100a, 100b.

[0069] It can be provided that the optical axis 118 of the light coupling surface 202 deviates from the main emission direction 110 of the associated light source 100a, 100b by a deviation 120. This influences the light unfolding of a beam 112, which represents a portion of the light 102a, 102b coupled through the light coupling surface 202, 202a, 202b. The beam 112 is tilted depending on the deviation 120, whereby the emitted light distribution 104 can be further influenced.

[0070] It can be provided that the deviation 120 is additionally and / or solely designed as an angular offset to the main beam direction 110.

[0071] The deviation 120 of the optical axis 118 of the light coupling surface 202, 202a, 202b from the main emission direction 110 of the associated light source 100a, 100b can vary along or parallel to the circumferential path 220.

[0072] In the example, a part of the coupled light 102a, 102b, which is coupled through the further light coupling surfaces 222a, 222b and guided through the further light guide surfaces 224a, 224b, is shown as a further beam 114a, 114b.

[0073] Figure 4 schematically illustrates an embodiment of the illumination device 2 in section AA. In this embodiment, the radar-transparent section 400 comprises a heating element 10 with heating coils 12. The heating element 10 ensures faultless functioning of the radar device 8, since, for example, icing of the coupling-out surface 404 can be prevented.

[0074] In the example, the radar-transparent section 400 comprises light-transparent openings 406a, 406b in a transmission-inhibiting layer 406 with reduced light transmittance. In the example, the transmission-inhibiting layer 406 is provided as a lacquer layer. Films or other materials or intermediate layers are also conceivable. The transmission-inhibiting layer 406 can also be opaque.

[0075] By means of the light-transparent openings 406a, 406b in the transmission-inhibiting layer 406, any desired pattern or logo can be imaged, through which the light 102b introduced into the radar-transparent section 400 exits. This results in illumination of the pattern imaged through the light-transparent openings 406a, 406b, which is particularly visible in the top view of the illumination device.

[0076] It can be provided that a reflection section 408 of the radar-transparent section 400, oriented in the direction of the radar coupling surface 402 for coupling the radar radiation 6, comprises at least in sections reflection surfaces 410, 410a, 410b with increased scattering effect for incident light. As a result, the light 102b introduced into the radar-transparent section 400 onto the reflection surfaces 410a, 410b is scattered, whereby more light rays are directed in the direction of the optical axis 4 and the light-transparent openings 406a, 406b. Thus, more light rays pass through the openings 406a, 406b.

[0077] It can be provided that the reflective surfaces 410, 410a, 410b with increased scattering effect are arranged such that the reflected and scattered light passes through the respectively associated light-transparent opening 406a, 406b. In the example, the reflective surfaces 410a, 410b are aligned and arranged flush with the openings 406a, 406b. It can be provided that a partially transparent layer 412, which has a visual appearance of, for example, chrome-like, and has a higher transmittance than the transmission-inhibiting layer 406, closes the openings 406a, 406b at least in sections. In the example, the partially transparent layer 412 is continuous across the illumination device. The partially transparent layer 412 can be arranged before or after the transmission-inhibiting layer 406 in the optical direction. Alternatively, other appearances of the partially transparent layer 412 are conceivable, such as color filters.Due to the partially transparent layer 412, the appearance of the pattern imaged through the openings 406a, 406b can be influenced even when the light source 100a, 100b is switched off.

[0078] It can be provided that the lighting device 2 is designed as part of a front grille for a motor vehicle or is integrated or can be integrated into it.

[0079] In addition, it is conceivable that the light-guiding section 200 and the radar-transparent section 400 are separately manufactured components, and that the at least one light-guiding section 200 and the radar-transparent section 400 are materially connected, in particular glued, in the light transition region 300.

[0080] Figure 5 schematically shows the top view of Figure 3 of the embodiment of the illumination device 2. Furthermore, the beam 112 and the further beam 114a, 114b are shown as examples of a light source. To an observer, the pattern formed by the openings 406a, 406b, shown in black in Figures 3 and 5, appears illuminated.

[0081] The beam 112 and the further beams 114a, 114b together form the emitted light distribution 104, which in the example is influenced by the openings 406a, 406b.

[0082] Figure 6 shows a schematic top view of the lighting device 2. The beam 112 and the additional beams 114a, 114b of the individual light sources 100a, 100b are summarized below as beam 124 for simplified representation. It is also conceivable that the beam 124 represents only the light 120a, 102b coupled through the light coupling surface 202a, 202b, in the event that the additional light coupling surfaces 222a, 222b are not provided.

[0083] In the embodiment of Figure 6, the light sources 100a, 100b are evenly distributed along the light-guiding section 200. In the illustration shown, no deviation 120 is provided in the case that the light-guiding section 200 is designed according to the embodiment of Figure 3.

[0084] The result is a radiated light distribution 104 that homogeneously illuminates the pattern imaged through the openings 406a, 406b.

[0085] Figure 7 shows a schematic top view of the lighting device 2. In this embodiment, the light sources 100a, 100b are not evenly distributed along the light guide section 200. This may be necessary, for example, due to design specifications or installation space requirements.

[0086] It can be provided that groups of light sources 100a, 100b are spaced apart from one another along or parallel to the circumferential path 220, wherein the respective deviation increases towards the light sources 100a, 100b of the group that terminate the group.

[0087] Furthermore, it can be provided that at least one region along the circumferential section 220, in particular two opposite regions along the circumferential section 220, is free of illuminants.

[0088] In addition, it is conceivable that at least some of the plurality of adjacent light sources 100a, 100b are equally spaced from one another.

[0089] The embodiment according to Figure 7 provides, in the example, a configuration of the light coupling surface 202, 202a, 202b according to the configuration shown in Figure 3. Furthermore, the light coupling surface 202, 202a, 202b has at least a partial deviation 120. This deviation is recognizable by the obliquely indicated path of the beam 124 in Figure 7. Despite the uneven distribution of the light sources 100a, 100b, a homogeneously illuminated pattern formed by the openings 406a, 406b can be implemented. This is possible due to the emitted light distribution 104 influenced by the deviation 120.

[0090] In general, any distribution of the light sources 100a, 100b and an individual adaptation of the deviation 120 for the individual light sources 100a, 100b to a pattern predetermined or predeterminable by the openings 406a, 406b are conceivable.

[0091] Figure 8 schematically shows an isometric view of the light-guiding section 200 of the lighting device 2. This embodiment of the light-guiding section 200 comprises the light-coupling surface 202, 202a, 202b as well as the further light-coupling surfaces 222a, 222b and the further light-guiding surfaces 224a, 224b as shown in Figure 3. The course of the circumferential section 220 is also indicated.

[0092] In this embodiment, the light coupling surface 202, 202a, 202b is designed in the form of a two-dimensional lens. Each of the light coupling surfaces 202, 202a, 202b is assigned one of the light sources 100a, 100b (not shown in Figure 8).

[0093] Figure 9 shows a schematic isometric view of the light-guiding section 200 of the lighting device 2. It can be provided that the light-guiding section 200 comprises a receiving device 238. The receiving device 238 is designed such that the light source 100a, 100b can be arranged thereon.

[0094] In the example, the receiving device 238 comprises a receiving surface 240 and a positioning pin 242. The circuit board 122, on which, for example, the light sources 100a, 100b are provided, rests on the receiving surface 240 and is positioned by means of the positioning pin 242. The circuit board can then be fixed to the light-guiding section 200 or the lighting device 2 by means of the positioning pin 242, for example by stamping, caulking, pressing, gluing, and / or screwing. A plurality of receiving devices 238 can be provided on the light-guiding section, in particular at least two receiving devices 238.

Claims

Claims 1 . A lighting device (2), in particular for a motor vehicle, comprising: at least one light source (100a, 100b) for emitting light; a light-guiding section (200) which, with respect to an optical axis (4) of the illumination device (2), is arranged outside a radar coupling surface (402) of a radar-transparent section (400) for coupling in radar beams (6) and extends at least in sections along an imaginary circumferential path (220), wherein the light-guiding section (200) comprises at least one curved light coupling surface (202a, 202b) for coupling in light from the at least one light source (100a, 100b), wherein the light-guiding section (200) guides the coupled-in light (102a, 102b) from the light coupling surface (202, 202a, 202b) to a light transition region (300) between the light-guiding section (200) and the radar-transparent section (400),and wherein the light-guiding section (200) has, towards the light transition region (300), a light-guiding surface (206) formed by a convex outer contour (204) facing away from an optical axis (4) of the illumination device (2) and a light-guiding surface (210) formed by an inner contour (208) facing the optical axis (4), wherein the curved light-coupling surface (202, 202a, 202b) connects the convex outer contour (204) and the inner contour (208) to one another; and the radar-transparent section (400) with the radar coupling surface (402) for coupling in the radar radiation (6) and with a coupling-out surface (404) for coupling out the coupled radar radiation (6) and for emitting a light distribution (106) depending on the light (104) introduced into the inner radar-transparent section (400) by means of the light-guiding section (200).

2. The lighting device (2) according to claim 1, wherein the at least one light coupling surface (202b) is concavely curved relative to the circumferential section (220), in particular perpendicular to the circumferential section (220).

3. The lighting device (2) according to claim 1, wherein the at least one light coupling surface (202a) is convexly curved relative to the circumferential section (220), in particular perpendicular to the circumferential section (220).

4. The lighting device (2) according to one of the preceding claims comprising a plurality of light sources (100a,b) and a plurality of light coupling surfaces (202ab, 222ab), wherein a respective one of the plurality of light sources (100a,b) is assigned to a respective one of the plurality of light coupling surfaces (202a,b, 222a,b).

5. The lighting device (2) according to one of the preceding claims, wherein the at least one light coupling surface (202a) is convexly curved along or parallel to the circumferential section (220).

6. The lighting device (2) according to one of the preceding claims, wherein the curved light coupling surface (202, 202a, 202b) is arranged between two further light coupling surfaces (222a, 222b) for coupling in light of the at least one light source (100a, 100b), wherein the light (116) coupled in via the further light coupling surfaces (222a, 222b) strikes light guide surfaces (224a, 224b) which each enclose an angle (226) in a range between 30° and 50°, in particular 35° and 45°, in particular 40°, with the associated further light coupling surface (222a, 222b).

7. The lighting device (2) according to claim 6, wherein at least one of the further light-guiding surfaces (224a, 224b) has an elliptical concave contour.

8. The lighting device (2) according to claim 7, wherein the elliptical concave contour of the further light-guiding surface (224a, 224b) is designed such that a focal point of the elliptical concave contour in a proximity of the at least one light source (100a, 100b), in particular in the at least one light source (100a, 100b).

9. The lighting device (2) according to one of the preceding claims, wherein the two light coupling surfaces (222a, 222b) extend parallel to a main emission direction (110) of the light source.

10. The lighting device (2) according to one of the preceding claims, wherein the two adjacent light coupling surfaces (222a, b) extend at an angle of <5° to the main radiation direction of the associated light source.

11. The lighting device (2) according to one of the preceding claims, wherein an optical axis (118) of the light coupling surface (202) coincides with the main emission direction (110) of the associated light source (100a, 100b).

12. The lighting device (2) according to one of the preceding claims, wherein an optical axis (118) of the light coupling surface (202) deviates from the main emission direction (110) of the associated light source (100a, 100b) by a deviation (120).

13. The lighting device (2) according to one of the preceding claims, wherein the deviation (120) of the optical axis (118) of the light coupling surface (202) from the main emission direction (110) of the associated light source (100a, 100b) varies along or parallel to the circumferential path (220).

14. The lighting device (2) according to one of the preceding claims, wherein groups of light sources (100a, 100b) are spaced apart from one another along or parallel to the circumferential path (220), wherein the pairwise distance between light sources (100a, 100b) decreases towards the light sources (100a, 100b) of the group which terminate the group.

15. The lighting device (2) according to one of the preceding claims, wherein at least one region along the circumferential path (220), in particular two opposite areas along the circumferential section (220), are free of illuminants.

16. The lighting device (2) according to one of claims 1 to 13 and 15, wherein at least a part of the plurality of adjacent Light sources (100a, 100b) or all of the light sources (100a, 100b) are equally spaced from each other.

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