Lighting apparatus for a motor vehicle

Patent metadata

Field	Value
Publication number	US-10967779-B2
Application number	US-202016808795-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Nov 2, 2017
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

A lighting device for a motor vehicle has a laser light source from the light of which light radiation is generated into the area around the motor vehicle during operation of the lighting device. In the lighting device, a plurality of optical channels is associated with the laser light source, and the light of the laser light source can be guided via each optical channel in order to generate a separate light spread associated with the optical channel from the guided light in the area around the motor vehicle. An optical element, which can be switched by a control device into different switching states, is provided between the laser light source and the plurality of optical channels. A different switching state is associated with each optical channel. In each respective switching state, light from the laser light source is fed only into the optical channel with which the respective switching state is associated, by means of the optical element.

First claim

What is claimed is:

1. A lighting apparatus for a motor vehicle, comprising:
a laser light source, from the light of which light radiation is generated into an area around the motor vehicle during operation of the lighting apparatus;
a plurality of optical channels associated with the laser light source, wherein the light of the laser light source is guidable via each optical channel in order to generate in the area around the motor vehicle a separate light distribution associated with the optical channel from the guided light; and
an optical element, which is switchable by way of a control device to different switching states, arranged between the laser light source and the plurality of optical channels, wherein a separate switching state is associated with each optical channel and, in a respective switching state, light of the laser light source is fed only into the optical channel with which the respective switching state is associated, by way of the optical element;
wherein the control device is operable so as to cyclically switch over between at least two different switching states of the optical element, with the result that in one cycle the light of the laser light source is fed into at least two optical channels; and
wherein a repetition frequency of cycles is between 50 Hz and 2000 Hz.

2. The lighting apparatus according to claim 1 , wherein
the laser light source comprises a single laser diode.

3. The lighting apparatus according to claim 1 , wherein
a separate optical unit belongs to each optical channel, to which separate optical unit guided light is led in the respective optical channel in order to generate the light distribution associated with the respective optical channel with the aid of the optical unit.

4. The lighting apparatus according to claim 1 , wherein
the separate light distributions represent different light functions of the motor vehicle.

5. The lighting apparatus according to claim 1 , wherein the lighting apparatus is provided for generating light in the visible range, wherein the separate light distributions comprise one or more of the following light functions or parts thereof:
a flashing light, a daytime running light, a turning light, a parking light, a reverse light, a brake light, imagery in the surroundings of the motor vehicle, a low-beam light, a high-beam light.

6. The lighting apparatus according to claim 1 , wherein
the lighting apparatus is provided for generating light in the non-visible range, wherein the light is used for one or more driver assistance functions in the motor vehicle.

7. The lighting apparatus according to claim 1 , wherein
the repetition frequency of the cycles is between 500 and 2000 Hz.

8. The lighting apparatus according to claim 1 , wherein
the optical element comprises a movable mirror, which is movable into different switching positions corresponding to the switching states through actuation by way of the control device.

9. The lighting apparatus according to claim 1 , wherein
the optical element comprises a component with a variable refractive index, wherein the refractive index is changeable by way of the control device through variation of a voltage fed to the component and the different switching states are effected by the change in the refractive index.

10. The lighting apparatus according to claim 1 , wherein
the optical element is a MEMS component.

11. The lighting apparatus according to claim 1 , wherein
each optical channel comprises an optical waveguide, wherein the light originating from the laser light source is led in the optical waveguide.

12. The lighting apparatus according to claim 11 , wherein
each optical channel comprises a single optical fiber.

13. The lighting apparatus according to claim 1 , wherein
at least some of the optical channels comprise one or more conversion elements in order to convert the light of the laser light source from one wavelength range to another wavelength range.

14. The lighting apparatus according to claim 1 , wherein
the lighting apparatus comprises a light sensor system for sensing the light intensity in each optical channel, wherein the control device is configured so as to evaluate the sensed light intensity.

15. The lighting apparatus according to claim 14 , wherein
the control device is configured so as to adjust the switching states of the optical element with feedback to the light intensity sensed by the light sensor system so that in the respective switching state the light intensity in the optical channel in which light of the laser light source is fed in exceeds a predetermined threshold.

16. The lighting apparatus according to claim 15 , wherein
the control device is configured so as to detect a fault when the deviation between the light intensity, which is sensed by the light sensor system, in the optical channel in which light of the laser light source is fed in and a prescribed setpoint light intensity exceeds a predetermined threshold value, wherein the prescribed setpoint light intensity depends on the operating state of the lighting apparatus.

17. A motor vehicle, comprising one or more lighting apparatuses according to claim 1 .

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Erdl Helmut
• Hanafi Abdelmalek
• Seifried Reinhard

Classifications

• F21S41/25

  Projection lenses · CPC title

• F21S41/13

  Ultraviolet light; Infrared light · CPC title

• F21S41/24

  Light guides · CPC title

• B60Q1/28

  for indicating front of vehicle · CPC title

• B60Q1/0011 Primary

  with light guides for distributing the light between several lighting or signalling devices · CPC title