Illumination apparatus for a motor vehicle

Patent metadata

Field	Value
Publication number	US-11326754-B2
Application number	US-202017427239-A
Country	US
Kind code	B2
Filing date	Jan 28, 2020
Priority date	Jan 31, 2019
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

An illumination apparatus for a motor vehicle includes a light source for emitting light of a first mixed color, said light source containing one or more laser diodes for generating monochromatic light and a first conversion element for converting the monochromatic light into the light of the first mixed color. The illumination apparatus also includes a first optical device which images the light source as a real image in an intermediate image plane, and a second optical device which generates a predefined light distribution from the real image in the intermediate image plane. A second conversion element is provided at the site of the real image in the intermediate image plane in order to convert the light of the first mixed color into light of a second mixed color.

First claim

What is claimed is:

1. An illumination apparatus for a motor vehicle, the illumination apparatus comprising:
a light source for emitting light of a first mixed color, wherein the light source comprises a laser diode for generating monochromatic light and a first converting element for converting the monochromatic light into the light of the first mixed color;
a first optical device which images the light source as a real image in an intermediate image plane;
a second optical device which generates a predetermined light distribution from the real image in the intermediate image plane; and
a second converting element at a location of the real image in the intermediate image plane wherein the second converting element is configured to convert the light of the first mixed color into light of a second mixed color.

2. The illumination apparatus according to claim 1 , wherein the light source is an essentially punctiform light source.

3. The illumination apparatus according to claim 1 , wherein the laser diode is configured to generate at least one of blue light, violet light, or UV light.

4. The illumination apparatus according to claim 1 , wherein the first mixed color is a white light color.

5. The illumination apparatus according to claim 2 , wherein the white light color is in the ECE white light range.

6. The illumination apparatus according to claim 1 , wherein the second mixed color is a white light color.

7. The illumination apparatus according to claim 6 , wherein the white light color is in the ECE white light range.

8. The illumination apparatus according to claim 1 , wherein the second converting element is configured to shift the first mixed color toward the second mixed color into the ECE white light range.

9. The illumination apparatus according to claim 1 , wherein the second converting element reduces light output in a blue spectral component of the first mixed color and increases light output in a red spectral component of the first mixed color.

10. The illumination apparatus according to claim 1 , wherein at least one of the first converting element or the second converting element is formed from one of the following materials:
Ce:YAG phosphor, cerium-doped nitride phosphor, cerium-doped oxide-nitride phosphor, CaAlSiN 3 :Eu 2+ , Sr 2 Si 5 N 8 Eu 2+ , M 2 SiO 4 :Eu 2+ where M=Ba 2+ , Sr 2+ or Ca 2+ , Sr 1-x AlSi 4 N 7 :Eu x where x=0.03, Li 3 Ba 2 La 3 (MoO 4 ) 8 :(Eu3+,Tb3+), or Y 2 O 2 S:EU 3+ .

11. The illumination apparatus according to claim 1 , wherein the first converting element and the second converting element are formed from a same base material.

12. The illumination apparatus according to claim 1 , wherein the first converting element and the second converting element are formed from different base materials.

13. The illumination apparatus according to claim 1 , wherein at least one of the first converting element or the second converting element is remissive or transmissive.

14. The illumination apparatus according to claim 1 , wherein at least one of the first optical device or the second optical device comprises at least one of one or more lenses or one or more reflectors.

15. The illumination apparatus according to claim 1 , wherein the illumination apparatus is a headlight or a signal light.

16. A motor vehicle comprising an illumination apparatus according to claim 1 .

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Erdl Helmut
• Hanafi Abdelmalek

Classifications

• F21S41/365

  successively reflecting the light · CPC title

• F21V9/38

  Combination of two or more photoluminescent elements of different materials · CPC title

• F21S41/176 Primary

  Light sources where the light is generated by photoluminescent material spaced from a primary light generating element · CPC title

• F21S43/10

  characterised by the light source · CPC title

• F21S41/16 Primary

  Laser light sources · CPC title