LIGHT GUIDE FOR A LIGHTING DEVICE OF A VEHICLE AND LIGHTING DEVICE WITH SUCH A LIGHT GUIDE

Abstract

A light guide is provided for a lighting device of a vehicle. The light guide includes an entrance surface into which light can enter, at least one lateral exit surface from which a portion of the light that has entered can exit, an end region through which a portion of the light that has entered can exit. The end region is structured and/or shaped in such a way that a portion of light which laterally emerges from the region adjacent to the end region after reflection at or in the end region is reduced or minimised.

Claims

1. A light guide for a lighting device of a vehicle, the light guide comprising: an entrance surface into which light enters, at least one lateral exit surface from which a portion of the light that has entered exits, an end region through which a portion of the light that has entered exits, wherein the end region is structured such that a portion of light which laterally emerges from the region adjacent to the end region after reflection at or in the end region is reduced.

2. The light guide according to claim 1, wherein the end region is structured at least in sections.

3. The light guide according to claim 1, wherein the end region is at least in sections conical or frustoconical in shape.

4. The light guide according to claim 3, wherein the end region comprises a plurality of conical or frustoconical sections.

5. The light guide according to claim 2, wherein the end region has a plurality of circumferential structures.

6. The light guide according to claim 1, wherein the entrance surface is arranged at an end of the light guide remote from the end region.

7. A lighting device for a vehicle, the lighting device comprising a light guide in accordance with claim 1.

8. The lighting device according to claim 7, wherein the light guide is arranged in the lighting device in such a way that, when the lighting device is installed in a vehicle, the light emerging from the at least one lateral exit surface can exit the vehicle.

9. The lighting device according to claim 7, wherein an absorption device is arranged in front of the end region of the light guide, which at least partially absorbs the light emerging from the end of the light guide.

10. The lighting device according to claim 7, wherein a reflection device is arranged in front of the end region of the light guide, which at least partially reflects back the light emerging from the end of the light guide.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Reference is now made more particularly to the drawings, which illustrate the best presently known mode of carrying out the invention and wherein similar reference characters indicate the same parts throughout the views.

[0018] FIG. 1 is a schematic side view of a detail of a first embodiment of a lighting device according to the invention with a first embodiment of a light guide according to the invention and sketched light beams.

[0019] FIG. 2 is a schematic side view of a detail of a second embodiment of a lighting device according to the invention with a second embodiment of a light guide according to the invention and sketched light beams.

[0020] FIG. 3 is a schematic side view of a detail of a third embodiment of a light guide according to the invention with sketched light beams.

[0021] FIG. 4 is a schematic side view of a detail of a fourth embodiment of a light guide according to the invention.

[0022] FIG. 5 is a schematic side view of a detail of an embodiment of a light guide of the prior art with sketched light beams.

DETAILED DESCRIPTION OF DRAWINGS

[0023] In the figures, identical or functionally identical parts are marked with identical reference signs.

[0024] The lighting device shown in FIG. 1 comprises a light guide 10 with an entrance surface not shown, into which light 11 can enter. The entrance surface can be located in particular at the front end of the light guide 10 not shown in the illustration. Furthermore the light guide 10 comprises an exit surface 12 through which the light 11 can exit laterally. On the side of the light guide 10 opposite the exit surface 12, a non-imaged plurality of, for example, prism-shaped coupling-out elements can be arranged which deflect the light 11 in the direction of the exit surface 12.

[0025] In particular, the illuminating device may be fitted to a vehicle in such a way that the exit surface 12 faces forward in the direction of travel of the vehicle indicated by the arrow 16.

[0026] The light guide 10 shown in FIG. 1 also includes an end region 13, which is conical in shape so that a large portion of the light 11 is transmitted in this conical geometry to the tip 14 of the end section 13. There the light 11 is distributed over a large solid angle range. Any reflected light is substantially reflected back out of the end region 13 into the light guide and is only very unlikely to exit laterally in the end region 13. In this way, the disturbing light rays emitted laterally are largely avoided.

[0027] The illuminating device further comprises an absorption device 15 placed in front of the tip 14 of the light guide 10 and capable of absorbing the light 11 emerging from the tip 14. The absorption device 15, for example, is designed as a housing open on one side into which the light 11 can enter. The inner surfaces of the housing may be coated with absorbing materials, for example blackened.

[0028] In the version shown in FIG. 2, instead of the absorption device 15, a reflection device 17 is arranged, which can at least partially reflect back the light 11 emerging from the tip 14 of the light guide 10. The reflection device 17 can, for example, be designed as barrel optics. By means of the reflection device 17, the light 11 can, in particular, be distributed comparatively evenly over a large solid angle range, so that an impairment of the appearance of the illumination device can also be largely avoided by this measure.

[0029] The design of a light guide 10 shown in FIG. 3 has a number of separate cones in the end section 13 instead of a single cone. Through each of the tips 14 the light 11 emerges into a large spatial angle range, so that overall a comparatively even distribution over a large solid angle range is achieved. In particular, a portion 18 of light 11 emerging in the direction of travel 16 can make a positive contribution to the light distribution produced by the lighting device.

[0030] The design of a light guide 10 shown in FIG. 4 has a plurality of coaxially circumferential structures 19 in the end region 13 instead of a plurality of separate cones. These structures 19 can be similar to Fresnel lenses, for example. These structures 19 can also largely avoid the disturbing light rays emerging laterally and at the same time be more space-saving than a single large conical or frustoconical end region 13.

LIST OF REFERENCE SIGNS

[0031] 1 light guide [0032] 2 end region of the light guide 1 [0033] 3 plane surface of the end region 2 [0034] 4 light entering the entrance surface of light guide 1 [0035] 5 exit surface of the light guide 1 [0036] 6 direction of travel [0037] 7 light beam that emerges laterally from the light guide 1 in the end region 2 [0038] 10 light guide [0039] 11 light entering the entrance surface of the light guide 10 [0040] 12 exit surface of the light guide 10 [0041] 13 end region of the light guide 10 [0042] 14 tip 14 of the end region 13 [0043] 15absorption device [0044] 16 direction of travel [0045] 17 reflection device [0046] 18 light emitted in direction of travel 16 [0047] 19 circumferential structure in the end region 13