High luminance solid state light source

Patent metadata

Field	Value
Publication number	US-9255672-B2
Application number	US-201314397095-A
Country	US
Kind code	B2
Filing date	Apr 30, 2013
Priority date	May 2, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A solid-state light source includes laser diodes that emit a laser beam with a first wavelength, a rotatable support that is arranged in a beam path of the laser beam and a reflector that is arranged between the laser diodes and the rotatable support. The rotatable support is formed of a ring or of an optically transparent disc. Further, the rotatable support is mounted to be rotatable around a rotation axis such that the laser beam impinges on a ring-shaped area of the rotatable support during rotation. Segments of the ring-shaped area include wavelength converting material that emits radiation of a second wavelength upon impingement of the laser beam. The rotatable support is mounted in a bearing that is arranged distant from the rotation axis to allow unhindered passage of the radiation directed by the reflector to the emission direction.

First claim

The invention claimed is:

1. A solid state light source comprising:
a laser diode configured to emit a laser beam with a first wavelength;
a rotatable support arranged in a beam path of the laser beam,
said rotatable support being formed of a ring to be rotatable around a rotation axis, wherein the laser beam impinges on a ring-shaped area of the rotatable support during rotation;
a segment of said ring-shaped area comprising a wavelength converting material emitting radiation of a second wavelength different from said first wavelength upon impingement of the laser beam; and
a reflector arranged between the laser diode and the rotatable support, the reflector being configured:
to allow passage of the laser beam through a portion of the reflector,
to collect the emitted radiation from a location of impingement of the laser beam on the ring-shaped area to form a collected radiation, and
to direct the collected radiation to an emission direction of the solid state light source,
wherein said rotatable support is mounted in bearings arranged distant from the rotation axis to allow unhindered passage of the radiation directed by the reflector to the emission direction, the bearings comprising a first bearing configured to contact an inner surface of the rotatable support and a second bearing configured to contact an outer surface of the rotatable support, the inner surface being closer to a center of the rotatable support than the outer surface.

2. The solid state light source according to claim 1 ,
wherein the rotatable support is configured to move through the bearings.

3. The solid state light source according to claim 1 ,
wherein an actuator for rotating the rotatable support is arranged outside an optical path of the radiation directed by the reflector to the emission direction.

4. The solid state light source according to claim 1 ,
wherein said wavelength converting material is a luminescent material.

5. The solid state light source according to claim 1 ,
wherein the reflector is configured to collimate the collected radiation.

6. The solid state light source according to claim 1 ,
wherein the reflector comprises an aperture to allow the passage of the laser beam.

7. The solid state light source according to claim 1 ,
wherein the reflector has a reflector radius which is larger than a radius of the ring-shaped area on the rotatable support and said reflector radius is smaller than a diameter of the ring-shaped area on the rotatable support.

8. The solid state light source according to claim 1 ,
further comprising a further segment of said ring-shaped area, said further segment comprising a further wavelength converting material different from the wavelength converting material, the further wavelength converting material emitting radiation of different wavelengths or wavelength regions different from at least one of the first and second wavelengths.

9. The solid state light source according to claim 1 ,
wherein the rotatable support comprises a cooling structure coming in contact with a heat dissipating member when moving through the bearings.

10. The solid state light source of claim 1 , wherein the first bearing is further configured to be aligned with the second bearing.

Assignees

• Koninkl Philips Nv

Inventors

• Weichmann Ulrich
• Pollmann-Retsch Jens

Classifications

• F21S10/007

  using rotating transparent or colored disks, e.g. gobo wheels · CPC title

• G03B33/08

  Sequential recording or projection (G03B33/02, G03B33/04, G03B33/06 take precedence) · CPC title

• G02B26/008

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• F21V9/32

  characterised by the arrangement of the photoluminescent material · CPC title

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title