Lighting device for a motor vehicle

Patent metadata

Field	Value
Publication number	US-9689548-B2
Application number	US-201514742224-A
Country	US
Kind code	B2
Filing date	Jun 17, 2015
Priority date	Dec 18, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

The invention relates to a lighting device for a motor vehicle, where the light device includes a light source having a plurality of semiconductor diodes, and a scanning device onto which light from the light source is incident and which generates a temporally varying deflection of the incident light from the light source during operation of the lighting device and thereby generates a predetermined light distribution at a distance from the lighting device. The scanning device has at least two separately controllable scanners, onto each of which a separate light beam generated from the light source is incident, the deflection of which beam is temporally varied by the respective scanner.

First claim

What is claimed is:

1. A lighting device for a motor vehicle, comprising:
a light source made of a number of semiconductor diodes; and
a scanning apparatus onto which light from the light source is incident and which, when the lighting device is in operation, produces a time-varying deflection of the incident light from the light source and, thereby, a predetermined light distribution at a distance from the lighting device,
wherein the scanning apparatus comprises at least two separately actuatable scanners, onto which in each case a separate light beam produced from the light of the light source is incident, the deflection of which light beam is varied in time by the respective scanner,
wherein a stop is arranged in the beam path of the light beams after deflection by the scanning apparatus, and
wherein the stop brings about a subdivision of an image plane into two regions.

2. The lighting device as claimed in claim 1 , wherein each of the at least two separately actuatable scanners respectively comprise at least one of a two-dimensional scanning unit and a vector scanning unit.

3. The lighting device as claimed in claim 1 , wherein the lighting device comprises at least one entrance optical means for the light from the light source, wherein, when the lighting device is in operation, the separate light beams are produced by way of the at least one entrance optical means.

4. The lighting device as claimed in claim 3 , wherein a common entrance optical means is provided for producing all separate light beams.

5. The lighting device as claimed in claim 1 , wherein at least one exit optical means, by means of which the predetermined light distribution is generated as an image, is provided for the light beams deflected by the at least two scanners.

6. The lighting device as claimed in claim 5 , wherein a common exit optical means is provided for all deflected light beams.

7. The lighting device as claimed in claim 1 , wherein at least one of the at least two separately actuatable scanners generates a separate region of the predetermined light distribution.

8. The lighting device as claimed in claim 1 , wherein at least two of the at least two separately actuatable scanners generate overlapping regions of the predetermined light distribution.

9. The lighting device as claimed in claim 1 , wherein the stop generates a light/dark boundary in the predetermined light distribution.

10. The lighting device as claimed in claim 1 , wherein the stop extends substantially parallel to an optical axis predetermined by the beam path of the light beams.

11. The lighting device as claimed in claim 1 , wherein, in at least one mode of operation of the lighting device, a first part of the scanners of the scanning apparatus is provided exclusively for deflecting light beams in a region below the stop, and a second part of the scanners of the scanning apparatus is provided exclusively for deflecting light beams in a region above the stop.

12. The lighting device as claimed in claim 1 , wherein, in at least one mode of operation of the lighting device, at least one scanner is provided exclusively for generating the light distribution at a light/dark boundary.

13. The lighting device as claimed in claim 1 , wherein the at least two scanners of the scanning apparatus are provided on a common assembly, wherein the common assembly includes at least one of a common cooling unit, a common electronics unit for the scanners, and a common mechanical adjustment apparatus for a support, on which the scanners are assembled.

14. The lighting device as claimed in claim 1 , wherein at least one scanner is embodied as a MEMS element.

15. The lighting device as claimed in claim 1 , wherein a number of semiconductor diodes of the light source comprises one or more laser diodes.

16. The lighting device as claimed in claim 1 , wherein the light source produces monochromatic light, wherein a conversion element converts the light from the light source into white light.

17. The lighting device as claimed in claim 1 , wherein the lighting device comprises at least one of a signal light and a headlamp.

18. The lighting device as claimed in claim 1 , wherein the lighting device comprises a headlamp configured such that, during operation, at least one of a dipped beam characteristic and a main beam characteristic is generated as predetermined light distribution.

19. A lighting device for a motor vehicle, comprising:
a light source made of a number of semiconductor diodes; and
a scanning apparatus onto which light from the light source is incident and which, when the lighting device is in operation, produces a time-varying deflection of the incident light from the light source and, thereby, a predetermined light distribution at a distance from the lighting device,
wherein the scanning apparatus comprises at least two separately actuatable scanners, onto which in each case a separate light beam produced from the light of the light source is incident, the deflection of which light beam is varied in time by the respective scanner,
wherein the separate light beams generate light spots with different sizes in the predetermined light distribution.

20. The light device of claim 19 , wherein the separate light beams generate light spots with different sizes in the predetermined light distribution by virtue of an entrance optical means having different sized lenses through which the separate light beams pass.

21. A motor vehicle comprising a lighting device, wherein the lighting device comprises:
a light source made of a number of semiconductor diodes; and
a scanning apparatus onto which light from the light source is incident and which, when the lighting device is in operation, produces a time-varying deflection of the incident light from the light source and, thereby, a predetermined light distribution at a distance from the lighting device,
wherein the scanning apparatus comprises at least two separately actuatableg scanners, onto which in each case a separate light beam produced from the light of the light source is incident, the deflection of which light beam is varied in time by the respective scanner,
wherein a stop is arranged in the beam path of the light beams after deflection by the scanning apparatus, and
wherein the stop brings about a subdivision of an image plane into two regions.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Erdl Helmut
• Hanafi Abdelmalek

Classifications

• F21S45/47

  Passive cooling, e.g. using fins, thermal conductive elements or openings · CPC title

• F21S41/675

  by moving reflectors · CPC title

• F21S41/43

  characterised by the shape thereof · CPC title

• F21S41/148

  the main emission direction of the LED being perpendicular to the optical axis · CPC title

• F21S41/16

  Laser light sources · CPC title