Lighting device with radar transparency and curved light in-coupling surface
By using a curved light-introducing coupling surface and a light guide on the outside of the radar transparent part of a motor vehicle, the design challenges of radar transparency and marking illumination are solved, achieving uniform illumination and flexible installation adaptability.
Patent Information
- Application Number
- CN202480056238.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-22
- Filing Date
- 2024-08-22
- Publication Date
- 2026-03-31
AI Technical Summary
When designing motor vehicles, how can we achieve uniform illumination of the markings while taking into account radar transparency and aesthetic factors, especially in the radar cone area without affecting the function of the radar device, and at the same time meet the installation space constraints?
It employs a curved light-introducing coupling surface and a light guide section. The light-introducing coupling surface is curved relative to the circumferential path. Combined with the design of convex and concave light guide surfaces, the beam path guides the light outside the radar transparent part and distributes the emitted light through the radar transparent part.
It increases design freedom, achieves uniform illumination of the sign, reduces the number of reflections in the beam path, lowers manufacturing costs, and adapts to the needs of different installation spaces.
Smart Images
Figure CN121773295A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an illumination device for a motor vehicle including a radar transparent section. Summary of the Invention
[0002] When designing motor vehicles, design freedom is often limited by available or planned installation space, especially when accommodating driver assistance systems such as radar devices. If aesthetic factors (such as sign lighting) also need to be considered, design freedom is further reduced.
[0003] To ensure optimal radar transparency, the light source used to illuminate the target must be placed outside the radar cone. Furthermore, it is impossible to introduce geometrical deviations within the radar cone, such as through microlenses or out-coupling contours, without significantly affecting radar transparency.
[0004] Materials that significantly absorb radar waves must not be used in the radar cone area or in the path of the radar wave detection beam. Furthermore, illuminated markings must be made of transparent materials. Because electronic components and circuits are opaque to radar waves, these components must be located outside the radar wave propagation area.
[0005] Therefore, it is desirable to achieve radar-transparent illumination of signs, such as in the front grille of a motor vehicle, so as to ensure uniform brightness of the signs and to influence the beam path in the illumination device without significantly limiting the function of the radar device in the radar cone area.
[0006] This problem is solved by the lighting device according to the independent claim.
[0007] One aspect of this specification relates to the subject matter of an illumination device, particularly for a motor vehicle, comprising: at least one light source for emitting light; a light guide disposed relative to the optical axis of the illumination device outside (e.g., radially outside) a radar ingress coupling surface of a radar transparent portion for coupling radar waves, and extending at least partially along an imaginary circumferential path, wherein the light guide has at least one curved light ingress coupling surface for coupling light from at least one light source, wherein the light guide guides the coupled light from the light ingress coupling surface to a light transition region located between the light guide and the radar transparent portion, and wherein the light guide has a light guide surface formed by a convex outer contour opposing the optical axis of the illumination device and a light guide surface formed by an inner contour facing the optical axis on the side facing the light transition region, wherein the curved light ingress coupling surface connects the convex outer contour and the inner contour; and a radar transparent portion comprising a radar ingress coupling surface and an egress coupling surface, the radar ingress coupling surface for coupling radar waves, the egress coupling surface for coupling out the coupled radar waves and for emitting a light distribution based on a beam of light introduced into the internal radar transparent portion through the light guide.
[0008] The curved light-injection coupling surface allows the path of the beam coupled into the light guide to be influenced within the light guide itself. This creates greater design freedom and allows the lighting fixture to be adapted to a predetermined installation space without adversely affecting the process of coupling the light.
[0009] A favorable example is characterized by at least one light-injection coupling surface being concavely curved relative to the circumferential path.
[0010] The concave, curved light-incident coupling surface causes the first imaginary focal point of the concave light-guiding surface, formed by the convex outer contour, to move closer to the light-incident coupling surface. This reduces the space required for the lighting device.
[0011] A favorable example is characterized by at least one light-injection coupling surface being convexly curved relative to the circumferential path.
[0012] The convex, curved light-incident coupling surface collimates the light coupled to the light guide. This causes the coupled light to strike the concave light guide surface at a greater distance from the light source. This reduces the number of reflections within the light guide.
[0013] A favorable example is characterized in that at least one optical coupling surface is convexly curved along or parallel to the circumferential path.
[0014] The bending of the light-incident coupling surface along or parallel to the circumferential path causes it to bend in another dimension, further affecting the incident light. This creates more design freedom, increases the flexibility of the lighting fixture, and mitigates the impact on the incident light.
[0015] An advantageous example is characterized by a curved light-incident coupling surface arranged between two additional light-incident coupling surfaces for coupling light from at least one light source, wherein the light coupled through the additional light-incident coupling surfaces illuminates a light guide surface, and the angle formed between each light guide surface and the associated additional light-incident coupling surface is between 30° and 50°, particularly between 35° and 45°, particularly 40°.
[0016] The additional light-incident coupling surface improves the incident light from the light source because light emitted laterally from the light source is also coupled into the light guide. This increases the brightness of the emitted light distribution of the lighting device. The additional light guide surface guides the incident light coupled through the additional light-incident coupling surface into the light transition region, thereby reducing the reflection of incident light in the light guide.
[0017] A favorable example is characterized by at least one additional light-guiding surface having an elliptical concave profile.
[0018] The additional elliptical concave profile of the light guide surface further reduces the number of reflections of light coupled through the additional light-in-coupling surface.
[0019] A favorable example is characterized in that the elliptical concave profile of the additional light guide surface is designed such that the focal point of the elliptical concave profile is located near, and in particular within, at least one light source.
[0020] By designing an additional light guide surface to have a focal point close to at least one light source, more light from at least one light source is coupled into the light guide section, thereby further improving the brightness of the light distribution of the lighting device.
[0021] A favorable example is characterized by two light-injection coupling surfaces extending parallel to the main emission direction of the light source.
[0022] The parallel light-injection coupling surface allows the entire light guide to be easily demolded, thereby reducing the cost of manufacturing the lighting device.
[0023] A favorable example is characterized by the fact that the angle between two adjacent light-incident coupling surfaces and the main emission direction of the associated light source is less than 5°.
[0024] This significantly improves the ease of demolding, and is applicable when the demolding direction is parallel to the LED's emission direction.
[0025] A favorable example is characterized in that the optical axis of the light-incident coupling surface coincides with the main emission direction of the associated light source.
[0026] By aligning the optical axis of the light-injection coupling surface with the main emission direction of the associated light source, symmetrical illumination of the radar's transparent parts can be achieved.
[0027] A favorable example is characterized by a deviation between the optical axis of the light-incident coupling surface and the main emission direction of the associated light source.
[0028] Because the optical axis of the light-incident coupling surface deviates from the main emission direction, the illumination direction in the radar-transparent area can be guided. This creates additional design freedom, allowing the illumination device to be flexibly adapted to given framework conditions, such as installation space or the pattern to be illuminated within the radar-transparent area.
[0029] A favorable example is characterized in that the deviation between the optical axis of the light-incident coupling surface and the main emission direction of the associated light source varies along or parallel to the circumferential path.
[0030] This means that the light cone of the light source changes only in the tangential direction along the circumferential path, which can avoid further reflection if necessary, while still guiding the illumination of the radar's transparent area through the light cone.
[0031] A favorable example is characterized in that the light source groups are spaced apart from each other along or parallel to the circumferential path, and each deviation increases toward the light source at the end of the group.
[0032] This arrangement of light sources makes the illumination of the radar's transparent areas more uniform.
[0033] A favorable example is characterized in that at least one region along the circumferential path, particularly two opposing regions along the circumferential path, does not contain any light source.
[0034] This allows lighting fixtures to be adapted to the installation space more flexibly.
[0035] A favorable example is characterized by at least some of the multiple adjacent light sources being equidistant from each other.
[0036] If the installation space allows for such an arrangement, the radar transparent area will be illuminated more uniformly without the need to adjust the light-injection coupling surface.
[0037] More advantageous embodiments can be found in the accompanying drawings and the following description. In the drawings: Figure 1 A cross-sectional schematic diagram of the lighting device is shown; Figure 2 A plan view of the lighting device is shown; Figure 3 A cross-sectional schematic diagram of a partial area of the light guide section of the lighting device is shown; Figure 4 A cross-sectional schematic diagram of one embodiment of the lighting device is shown; Figure 5 A plan view of one embodiment of the lighting device is shown; Figure 6 A plan view of this embodiment of the lighting device is shown; Figure 7 A plan view of one embodiment of the lighting device is shown; Figure 8 An isometric view of one embodiment of the lighting device is shown; Figure 9 It shows that according to Figure 8 An isometric view of a partial area of the embodiment shown.
[0038] Figure 1 A cross-sectional view AA is shown, specifically for a lighting device 2 used in motor vehicles. Figure 2A schematic plan view of the lighting device 2 is shown. The lighting device 2 includes at least one light source 100a, 100b (in particular, multiple light sources) for emitting light; and a light guide 200, which is arranged relative to the optical axis 4 of the lighting device 2 outside the radar insertion coupling surface 402 for coupling radar waves 6 into the radar transparency 400, and extends at least partially along a hypothetical circumferential path 220. The hypothetical circumferential path 220 can be, for example, circular, polygonal, or arbitrary linear shape. The circumferential path 220 can be partially closed or partially open. In this example, the circumferential path 220 is substantially circular and closed. The circumferential path 220 can be adapted to a predetermined installation space of the lighting device 2. Therefore, the light guide 200 is adapted to or can be adapted to this installation space.
[0039] In this example, light sources 100a and 100b are designed as LEDs. Multiple LEDs can be arranged on a circuit board to form light sources 100a and 100b. Alternatively, LED strips can also be used to form light sources 100a and 100b.
[0040] For example, light sources 100a and 100b are formed by a circuit board 122 with LEDs arranged thereon. The circuit board 122 can be designed as a continuous circuit board or a split circuit board. The LEDs arranged on the continuous and / or split circuit board 122 can be arranged in groups, with a different number of LEDs in each group, and different or uniform spacing between the LEDs or between groups.
[0041] For example, different currents can be applied individually or in groups to LEDs arranged on a common or independent circuit board to adjust the uniformity of light distribution.
[0042] In this example, the LEDs of light sources 100a and 100b are arranged on the same plane 108. The LEDs can also be arranged on different planes.
[0043] The light guide portion 200 includes at least one light-incident coupling surface 202a, 202b, the curvature of which differs relative to the circumferential path 220, for coupling in light 102a, 102b from at least one light source 100a, 100b. Therefore, the curvature of the at least one light-incident coupling surface 202a, 202b is curved relative to the circumferential path 220. This means that the at least one light-incident coupling surface 202a, 202b is curved relative to an imaginary plane parallel to the imaginary central plane of the circumferential path 220. The curvature of the circumferential path 220 differs from the curvature of the at least one light-incident coupling surface 202a, 202b at least at the points of curvature.
[0044] The light guide section 200 guides the incident coupled light 102a, 102b from the light incident coupling surfaces 202, 202a, 202b to the light transition region 300 between the light guide section 200 and the radar transparent section 400. Furthermore, the light guide section 200 has a light guide surface 206 formed by a convex outer contour 204 facing away from the optical axis 4 of the illumination device 2 and a light guide surface 210 formed by an inner contour 208 facing the optical axis 4 on the side facing the light transition region 300.
[0045] The curvature of the convex outer contour 204 can be adapted to the predetermined installation space of the lighting device 2. In addition, the curvature of the convex outer contour 204 can be set to be different at corresponding points on the imaginary circumferential path 220.
[0046] The basic shape of the convex outer contour 204 can be designed as an ellipse, which can be deformed into a freeform surface according to given conditions or the desired guidance of light 102a.
[0047] The curved light-injection coupling surfaces 202, 202a, and 202b connect the starting point 216 of the convex outer contour 204 and the starting point 218 of the inner contour 208.
[0048] The lighting device 2 also includes a radar transparent section 400, which includes a radar input coupling surface 402 and an output coupling surface 404. The radar input coupling surface 402 is used to couple in radar waves 6, and the output coupling surface 404 is used to couple in and out coupled radar waves 6 and emit light distribution 106 based on light 104 introduced into the internal radar transparent section 400 through the light guide section 200.
[0049] The radar transparent region 400 is also designed to couple incident radar waves into the radar transparent region 400 at the outgoing coupling surface 404 and out at the incoming coupling surface 402.
[0050] In this example, radar wave 6 is generated and processed by radar device 8.
[0051] At least one light-incident coupling surface 200, 202b can be concavely curved, particularly perpendicular to the circumferential path 220. This allows the first imaginary focal point 236 of the concave light guide surface 206 formed by the convex outer contour 204 to be closer to the light-incident coupling surfaces 200, 202b. Therefore, when light from the light sources 100a, 100b is coupled into the light guide portion 200 through the light-incident coupling surfaces 200, 200b, at least one light source 100a, 100b can be arranged closer to the light guide portion 200 without loss. The concavely curved light-incident coupling surface 202b is preferably used to emit a light distribution 104 that substantially surrounds the peripheral region of the optical axis 4.
[0052] At least one light-incident coupling surface 200, 202a can also be convexly curved, particularly perpendicular to the circumferential path 220. Therefore, the light 102 coupled into the light guide 200 via the convexly curved light-incident coupling surfaces 202, 202a is collimated. Consequently, the coupled light 102a is incident on the concave light guide surface 206 at a greater distance from at least one light source 100a, 100b, thereby reducing the number of reflections in the light guide 200. Furthermore, the characteristics of the elliptical concave light guide surface 206 are improved, which makes it require less freeform surface deformation.
[0053] The light-introducing coupling surfaces 202, 202a, and 202b may be continuously convex or concave curved along the circumferential path 220, or at least partially or locally convex and / or concave curved.
[0054] Figure 3 A schematic diagram of a local region of the lighting device along section BB is shown, the orientation of which is... Figure 2 The light incident surfaces 202, 202a are schematically marked. At least one light incident surface 202, 202a may also be convexly curved along or parallel to the circumferential path 220. In this example, the light incident surfaces 202, 202a, 202b in front of each light source 100a, 100b are designed as rotationally symmetric convex and / or concave surfaces. Each light source 100a, 100b may have an associated light incident surface 202, 202a, 202b.
[0055] In this example, curved light-incident coupling surfaces 202, 202a, 202b are arranged between two other light-incident coupling surfaces 222a, 222b for coupling light from at least one light source 100a, 100b. The coupled light 116, passing through the other light-incident coupling surfaces 222a, 222b, illuminates light guide surfaces 224a, 224b. The angle formed between each light guide surface 224a, 224b and the associated other light-incident coupling surfaces 222a, 222b ranges from 30° to 50°, particularly from 35° to 45°, and particularly 40°.
[0056] For simplicity, the light-incident coupling surfaces 202, 202a, 202b, the additional light-incident coupling surfaces 222a, 222b, and the additional light-guiding surfaces 224a, 224b are collectively referred to as the coupling region, which includes the spherically convex curved light-incident coupling surfaces 202, 202a with a radius 230 of 3.1 mm. The angle 226 between the additional light-incident coupling surfaces 222a, 222b and the additional light-guiding surfaces 224a, 224b is 40°. The edge length 232 of the additional light-guiding surfaces 224a, 224b is 10 mm. In this example, the distance 234 between the opposing additional light-incident coupling surfaces is 5.8 mm. In this example, the light sources 100a, 100b are arranged at a distance of 1.1 mm from the light-incident coupling surfaces 202, 202a. In this example, the thickness of the light guide portion can be 3 mm. For example, due to specific installation space requirements or the design of the required emitted light distribution 104, the dimensions described in this example may differ for different coupling regions of the light guide 200. Furthermore, it is conceivable that the light-incident coupling surfaces 202, 202a, 202b, additional light-incident coupling surfaces 222a, 222b, and additional light guide surfaces 224a, 224b within the coupling region are all different from each other.
[0057] Depending on the angle 226, not all the light 116 entering through the light-incident coupling surfaces 224a and 224b will illuminate the light-guiding surfaces 224a and 224b. However, a considerable portion of the light 116 will illuminate the light-guiding surfaces 224a and 224b.
[0058] Light emitted laterally from light sources 100a and 100b is also coupled into the light guide section 200 through additional light-incident coupling surfaces 222a and 222b, and then guided towards the light transition region 300 through additional light guide surfaces 224a and 224b. This results in more light emitted from light sources 100a and 100b being coupled into the light guide section 200, thereby increasing the brightness of the emitted light distribution 106.
[0059] It is conceivable that at least one of the additional light-guiding surfaces 224a and 224b has an elliptical concave profile. The dimensions of the elliptical concave profiles of the additional light-incident coupling surfaces 222a and 222b can further influence the beam path through the additional light-incident coupling surfaces 222a and 222b. This further enhances the influence on the emitted light distribution 104.
[0060] For example, the elliptical concave profiles of the other light guide surfaces 224a and 224b can be designed such that the imaginary focus of the elliptical concave profile is located near, or in particular within, at least one light source 100a and 100b.
[0061] In this example, two light-incident coupling surfaces 222a and 222b extend parallel to each other along the main emission direction 110 of the light source. The light-incident coupling surfaces 222a and 222b may be configured to be at least partially oriented at a predetermined tilt angle relative to the main beam direction 110, and / or have concave or convex profiles.
[0062] In this example, the optical axis 118 of the light-incident coupling surface 202 coincides with the main emission direction 110 of the associated light sources 100a and 100b.
[0063] The optical axis 118 of the optical coupling surface 202 can be offset by 120 from the main emission direction 110 of the associated light sources 100a and 100b. This will affect the light propagation of beam 112, which represents a portion of the light 102a and 102b coupled through the optical coupling surfaces 202, 202a, and 202b. Beam 112 is tilted based on the offset 120, which will further affect the emitted light distribution 104.
[0064] The deviation 120 can be set additionally and / or designed simply as an angular offset relative to the main beam direction 110.
[0065] The deviation 120 between the optical axis 118 of the optical coupling surfaces 202, 202a, 202b and the main emission direction 110 of the associated light sources 100a, 100b can vary along the circumferential path 220 or parallel to the circumferential path 220.
[0066] In this example, some of the incident coupled light 102a, 102b is coupled into the light through other incident coupling surfaces 222a, 222b and guided by other light guide surfaces 224a, 224b. These light beams are shown as other light beams 114a, 114b.
[0067] Figure 4 An embodiment of the illumination device 2 in section AA is schematically shown. In this embodiment, the radar transparency 400 includes a heating element 10, which includes a heating coil 12. The heating element 10 ensures the perfect operation of the radar device 8; for example, it can prevent the coupling surface 404 from freezing.
[0068] In this example, the radar transparent area 400 includes light-transmitting openings 406a and 406b located in a transmission suppression layer 406 with reduced light transmittance. In this example, the transmission suppression layer 406 is configured as a coating. A thin film or other material or intermediate layer is also possible. The transmission suppression layer 406 may also be opaque.
[0069] Any pattern or symbol can be displayed through the light-transmitting openings 406a and 406b in the transmission suppression layer 406, through which the light 102b introduced into the radar transparent part 400 exits. This illuminates the pattern displayed through the light-transmitting openings 406a and 406b, which is particularly evident in the plan view of the lighting device.
[0070] At least a portion of the reflective portion 408 of the radar transparent portion 400, facing the radar input coupling surface 402 for coupling into the radar wave 6, may include reflective surfaces 410, 410a, and 410b that enhance the scattering effect on incident light. This causes the light 102b introduced into the radar transparent portion 400 to be scattered onto the reflective surfaces 410a and 410b, thereby guiding more light towards the optical axis 4 and the light-transmitting openings 406a and 406b. Therefore, more light passes through the openings 406a and 406b.
[0071] Reflective surfaces 410, 410a, and 410b with enhanced scattering effects can be provided, such that emitted and scattered light pass through associated light-transmitting openings 406a and 406b, respectively. In this example, reflective surfaces 410a and 410b are oriented and arranged to align with openings 406a and 406b.
[0072] A translucent layer 412 may be provided, for example, having a chrome-like visual appearance and higher light transmittance than the transmission suppression layer 406, at least partially closing the openings 406a and 406b. In this example, the translucent layer 412 is continuously formed on the lighting device. The translucent layer 412 may be arranged before or after the transmission suppression layer 406 along the optical direction. Alternatively, it is conceivable that the translucent layer 412 has a different appearance, for example, as a color filter. Even when the light sources 100a and 100b are turned off, the translucent layer 412 can still affect the pattern appearance presented by the openings 406a and 406b.
[0073] The lighting device 2 can be set as part of the front grille of a motor vehicle, or integrated into or capable of being integrated into the front grille.
[0074] Furthermore, it is conceivable that the light guide portion 200 and the radar transparent portion 400 are manufactured separately, and that at least one light guide portion 200 and the radar transparent portion 400 are integrally bonded (especially adhesively bonded) in the light transition zone 300.
[0075] Figure 5 schematically shown Figure 3 The diagram shows a plan view of an embodiment of the lighting device 2. Furthermore, light beam 112 and additional light beams 114a and 114b are shown as examples of light sources. For the observer, [the light source appears to be...]. Figure 3 and Figure 5The pattern formed by the black openings 406a and 406b appears to be illuminated.
[0076] Beam 112 and other beams 114a and 114b together form an emitted light distribution 104, which in this example is affected by openings 406a and 406b.
[0077] Figure 6 A plan view of the lighting device 2 is shown. For simplicity, the beams 112 of each light source 100a, 100b and the other beams 114a, 114b are collectively referred to as beam 124 below. It can also be envisioned that, without the provision of other light-incident coupling surfaces 222a, 222b, this beam 124 only represents the light 102a, 102b coupled through the light-incident coupling surfaces 202a, 202b.
[0078] exist Figure 6 In the illustrated embodiment, light sources 100a and 100b are uniformly distributed along the light guide portion 200. In the illustrated figure, if the light guide portion 200 is based on... Figure 3 If the embodiment is designed accordingly, then there is no deviation of 120.
[0079] This allows the emitted light distribution 104 to uniformly illuminate the pattern presented by the openings 406a and 406b.
[0080] Figure 7 A plan view of the lighting device 2 is shown. In this embodiment, the light sources 100a and 100b are not uniformly distributed along the light guide 200. This may be necessary, for example, due to design specifications or installation space requirements.
[0081] The light source groups can be set to be spaced apart from each other along or parallel to the circumferential path 220, wherein each deviation increases toward the light sources 100a, 100b at the end of the light source group.
[0082] In addition, it can be configured such that at least one region along the circumferential path 220, particularly two opposite regions along the circumferential path, does not contain any light source.
[0083] Furthermore, it is conceivable that at least some of the multiple adjacent light sources 100a, 100b are equidistant from each other.
[0084] according to Figure 7 In this embodiment, the configuration of optical coupling surfaces 202, 202a, and 202b is provided, as follows: Figure 3 The configuration is shown. Furthermore, at least some of the optical coupling surfaces 202, 202a, and 202b exhibit a deviation of 120°. From Figure 7 This deviation can be seen in the tilted path of beam 124 shown.
[0085] Despite the uneven distribution of light sources 100a and 100b, a uniform illumination pattern formed by openings 406a and 406b can still be achieved. This is due to the emitted light distribution 104 affected by the deviation 120.
[0086] In general, any distribution of light sources 100a and 100b can be envisioned, as well as individual adjustments to the deviation 120 for each light source 100a and 100b, to adapt to the pattern defined by or that can be defined by openings 406a and 406b.
[0087] Figure 8 An isometric view of the light guide portion 200 of the lighting device 2 is schematically shown. Embodiments of the light guide portion 200 include light-incident coupling surfaces 202, 202a, and 202b, and as shown... Figure 3 The figure shows additional light-injection coupling surfaces 222a and 222b, and additional light-guiding surfaces 224a and 224b. Furthermore, the direction of the circumferential path 220 is indicated in the figure.
[0088] In this embodiment, the light-incident coupling surfaces 202, 202a, and 202b are designed as two-dimensional lenses. Each light-incident coupling surface 202, 202a, and 202b is assigned one of the light sources 100a and 100b. Figure 8 (Not shown in the image).
[0089] Figure 9 A schematic isometric view of the light guide section 200 of the lighting device 2 is shown. The light guide section 200 may include a receiving device 238. The receiving device 238 is designed so that light sources 100a and 100b can be arranged thereon.
[0090] In this example, the receiving device 238 includes a receiving surface 240 and a positioning pin 242. For example, a circuit board 122 equipped with light sources 100a and 100b is placed on the receiving surface 240 and positioned by the positioning pin 242. Subsequently, the circuit board can be fixed to the light guide 200 or the lighting device 2 by means of positioning pin 242, for example by stamping, pressing, pressing, gluing and / or screw connection.
[0091] Multiple receiving devices 238, particularly at least two receiving devices 238, can be installed on the light guide section.
Claims
1. A lighting device (2), particularly for motor vehicles, comprising: At least one light source (100a, 100b) is used to emit light; A light guide (200) is arranged relative to the optical axis (4) of the illumination device (2) outside the radar ingress coupling surface (402) for coupling radar waves (6) into the radar transparent section (400), and extends at least partially along an imaginary circumferential path (220). The light guide (200) has at least one curved light ingress coupling surface (202a, 202b) for coupling light from the at least one light source (100a, 100b). The light guide (200) guides the coupled light (102a, 102b) from the light ingress coupling surface (202a, 202b). 02a, 202b) guides the light to a light transition zone (300) located between the light guide (200) and the radar transparent part (400), wherein the light guide (200) has a light guide surface (206) formed by a convex outer contour (204) facing away from the optical axis (4) of the illumination device (2) and a light guide surface (210) formed by an inner contour (208) facing the optical axis (4) on the side facing the light transition zone (300), wherein the curved light-introducing coupling surfaces (202, 202a, 202b) connect the convex outer contour (204) and the inner contour (208); and The radar transparent section (400) includes a radar input coupling surface (402) and an output coupling surface (404). The radar input coupling surface (402) is used to couple in the radar wave (6), and the output coupling surface (404) is used to couple out the input coupled radar wave (6). It is also used to emit a light distribution (106) based on the light (104) introduced into the internal radar transparent section (400) through the light guide section (200).
2. The lighting device (2) according to claim 1, wherein, The at least one optical coupling surface (202b) is concave relative to the circumferential path (220) and, in particular, convex perpendicular to the circumferential path (220).
3. The lighting device (2) according to claim 1, wherein, The at least one optical coupling surface (202a) is convexly curved relative to the circumferential path (220), and in particular, is convexly curved perpendicular to the circumferential path (220).
4. The lighting device (2) according to any one of the preceding claims comprises a plurality of light sources (100a, b) and a plurality of light-injection coupling surfaces (202ab, 222ab), wherein, Each of the plurality of light sources (100a, b) is assigned to one of the plurality of light-injection coupling surfaces (202a, b, 222a, b).
5. The lighting device (2) according to any one of the preceding claims, wherein, The at least one optical coupling surface (202a) is convexly curved along or parallel to the circumferential path (220).
6. The lighting device (2) according to any one of the preceding claims, wherein, The curved light-injection coupling surfaces (202, 202a, 202b) are arranged between two additional light-injection coupling surfaces (222a, 222b) for coupling in light from the at least one light source (100a, 100b), wherein the light (116) coupled in through the additional light-injection coupling surfaces (222a, 222b) irradiates the light guide surfaces (224a, 224b), and the angle (226) formed between each of the light guide surfaces (224a, 224b) and the associated additional light-injection coupling surfaces (222a, 222b) is between 30° and 50°, particularly between 35° and 45°, particularly 40°.
7. The lighting device (2) according to claim 6, wherein, The additional light guide surfaces (224a, 224b) have an elliptical concave profile.
8. The lighting device (2) according to claim 7, wherein, The elliptical concave profile of the additional light guide surfaces (224a, 224b) is designed such that the focal point of the elliptical concave profile is located near, and particularly within, the at least one light source (100a, 100b).
9. The lighting device (2) according to any one of the preceding claims, wherein, The two light-injection coupling surfaces (222a, 222b) extend parallel to each other along the main emission direction (110) of the light source.
10. The lighting device (2) according to any one of the preceding claims, wherein, The two adjacent light-injection coupling surfaces (222a, b) extend at an angle of less than 5° relative to the main emission direction of the associated light source.
11. The lighting device (2) according to any one of the preceding claims, wherein, The optical axis (118) of the optical coupling surface (202) coincides with the main emission direction (110) of the associated light source (100a, 100b).
12. The lighting device (2) according to any one of the preceding claims, wherein, The optical axis (118) of the optical coupling surface (202) deviates (120) from the main emission direction (110) of the associated light source (100a, 100b).
13. The lighting device (2) according to any one of the preceding claims, wherein, The deviation (120) between the optical axis (118) of the optical coupling surface (202) and the main emission direction (110) of the associated light source (100a, 100b) varies along the circumferential path (220) or parallel to the circumferential path (220).
14. The lighting device (2) according to any one of the preceding claims, wherein, The light source groups (100a, 100b) are spaced apart from each other along or parallel to the circumferential path (220), wherein the distance between the light source pairs (100a, 100b) decreases toward the light source (100a, 100b) at the end of the light source group.
15. The lighting device (2) according to any one of the preceding claims, wherein, At least one region along the circumferential path (220), particularly two opposite regions along the circumferential path (220), does not contain any light source.
16. The lighting device (2) according to any one of claims 1-13 and 15, wherein, At least some or all of the plurality of adjacent light sources (100a, 100b) are equidistant from each other.