Headlight with scanning light device

Patent metadata

Field	Value
Publication number	US-10240744-B2
Application number	US-201715421526-A
Country	US
Kind code	B2
Filing date	Feb 1, 2017
Priority date	Feb 8, 2016
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

A motor vehicle headlight and a motor vehicle illumination device, which includes at least one light source for emitting light rays, a wavelength conversion element arranged to receive the light rays on a zone and to re-emit a light radiation to produce a light beam, a reflecting element for redirecting light rays from the light sources towards the conversion element, and a scanning apparatus configured to scan the reflecting element with the light rays in a first direction between extreme positions, the reflecting element being configured to reflect light rays at said extreme positions to a central part of the zone so as to form the central part of the light beam.

First claim

The invention claimed is:

1. A motor vehicle illumination device, comprising:
at least one light source for emitting light rays;
a wavelength conversion element arranged to receive the light rays on a zone and to re-emit a light radiation to produce a light beam;
a reflecting element for redirecting light rays from the light source towards the conversion element; and
a scanning apparatus configured to scan the reflecting element with the light rays in a first direction between extreme positions, the reflecting element being configured to reflect light rays at said extreme positions to a central part of the zone so as to form the central part of the light beam.

2. The illumination device of claim 1 , further comprising an optical projection system arranged at an output of the illumination device to at least partly produce the light beam.

3. The illumination device of claim 1 , further comprising an adjustable secondary mirror arranged between the reflecting element and the conversion element on a path of the light rays, the secondary mirror being configured to deflect the light rays in a second direction.

4. The illumination device of claim 1 , wherein the reflecting element is adjustable and configured to make the light rays scan in a second direction.

5. The illumination device of claim 1 , wherein the scanning apparatus is configured to make the light rays scan in a second direction.

6. The illumination device of claim 1 , wherein the scanning apparatus is provided with an adjustable micromirror configured to make the light rays scan in the first direction.

7. The illumination device of claim 1 , wherein the light source is at least one laser diode.

8. The illumination device of claim 1 , wherein the reflecting element is configured to deflect the light rays which are central positions substantially midway between the extreme positions, to edges of the zone to form sides of the light beam.

9. The illumination device of claim 8 , wherein the reflecting element is configured to:
deflect the light rays from a first extreme position to a central position on the zone, such that the light rays scan the zone from said central part of the zone to a first edge of the zone; and
deflect the light rays from the central position to a second extreme position opposite the first extreme position on the zone, such that the deflected light rays scan the zone from the central part of the zone to a second edge of the zone opposite the first edge.

10. The illumination device of claim 1 , wherein the conversion element comprises a substrate and a layer of a photoluminescent material.

11. The illumination device of claim 10 , wherein the layer of photoluminescent material comprises phosphorus or yttrium-aluminum-garnet.

12. The illumination device of claim 1 , wherein the reflecting element comprises two reflecting faces.

13. The illumination device of claim 12 , wherein the reflecting faces are adjacent and form a V, an interior of the V including the reflecting faces.

14. The illumination device of claim 13 , wherein the reflecting element is arranged in an axis of the scanning apparatus such that a vertex of the V receives the central positions of the light rays.

15. The illumination device of claim 14 , wherein the reflecting element is a mirror provided with two planes forming the two reflecting faces.

16. A motor vehicle headlight comprising:
a housing; and
an illumination device arranged within the housing, the illumination device including
at least one light source for emitting light rays,
a wavelength conversion element arranged to receive the light rays on a zone and to re-emit a light radiation to produce a light beam,
a reflecting element for redirecting light rays from the light sources towards the conversion element, and
a scanning apparatus configured to scan the reflecting element with the light rays in a first direction between extreme positions, the reflecting element being configured to reflect light rays at said extreme positions to a central part of the zone so as to form the central part of the light beam.

Assignees

• Valeo Vision

Inventors

• Boinet Loic

Classifications

• F21S41/37

  characterised by their material, surface treatment or coatings · CPC title

• F21S41/335

  with continuity at the junction between adjacent areas · CPC title

• F21S41/14

  characterised by the type of light source · CPC title

• G02B17/023

  for extending or folding an optical path, e.g. delay lines · CPC title

• F21S41/25

  Projection lenses · CPC title