Coherent light source device and projector

Patent metadata

Field	Value
Publication number	US-9488849-B2
Application number	US-201314380285-A
Country	US
Kind code	B2
Filing date	Feb 20, 2013
Priority date	Feb 21, 2012
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

Provided are a coherent light source apparatus and a projector. A first light emission region is formed on basis of a coherent light source; a first optical system projects light derived from a first light emission region to form a second light emission region; a light deflection section deflects a bundle of rays in vicinity of the second light emission region; a second optical system downstream of the light deflection section; and a light mixing section downstream of the second optical system that mixes components of angles and positions of rays incident on an incident end. The second optical system forms an image conjugate to the first light emission region and a third light emission region substantially conjugate to an exit pupil of the first optical system. The light deflection section continues to cause a direction in which the bundle of rays is deflected to be continuously changed.

First claim

The invention claimed is:

1. A coherent light source apparatus comprising:
a coherent light source;
a first optical system configured to project light derived from a first light emission region-to form a second light emission region, the first light emission region being formed on basis of the coherent light source;
a light deflection section configured to deflect a bundle of rays in vicinity of the second light emission region, the bundle of rays being related to formation of the second light emission region;
a second optical system provided downstream of the light deflection section; and
a light mixing section provided downstream of the second optical system, and configured to mix components of angles and positions of rays incident on an incident end of the light mixing means,
the second optical system being configured to form, in distance, an image conjugate to the first light emission region, and form, at the incident end, a third light emission region substantially conjugate to an exit pupil of the first optical system, and
the light deflection section being configured to continue to perform an operation that causes a direction in which the bundle of rays is deflected to be continuously changed, and thereby causing the third light emission region to move continuously at the incident end.

2. The coherent light source apparatus according to claim 1 , wherein the second light emission region is conjugate to the first light emission region.

3. The coherent light source apparatus according to claim 1 , wherein the light mixing section is a fly eye integrator.

4. The coherent light source apparatus according to claim 1 , further comprising an optical fiber including an incident end to which light derived from the coherent light source is inputted and an emission end, wherein the first light emission region is formed by the emission end of the optical fiber.

5. A projector provided with a coherent light source apparatus and configured to project and display an image with use of the coherent light source apparatus, the coherent light source apparatus comprising:
a coherent light source;
a first optical system configured to project light derived from a first light emission region to form a second light emission region, the first light emission region being formed on basis of the coherent light source;
a light deflection section configured to deflect a bundle of rays in vicinity of the second light emission region, the bundle of rays being related to formation of the second light emission region;
a second optical system provided downstream of the light deflection section; and
a light mixing section provided downstream of the second optical system, and configured to mix components of angles and positions of rays incident on an incident end, the light mixing section being configured to serve as a light uniformizing section
the second optical system being configured to form, in distance, an image conjugate to the first light emission region, and form, at the incident end, a third light emission region substantially conjugate to an exit pupil of the first optical system, and
the light deflection section being configured to continue to perform an operation that causes a direction in which the bundle of rays is deflected to be continuously changed, and thereby causing the third light emission region to move continuously at the incident end.

Assignees

• Ushio Electric Inc

Inventors

• Shimizu Mikio
• Okamoto Masashi
• Miura Yuichi
• Toma Takahiro

Classifications

• H04N9/3152

  for shaping the light beam (beam shaping per se G02B27/09) · CPC title

• H04N9/3161

  using laser light sources (using laser beams scanning the display screen H04N9/3129) · CPC title

• G02B27/48 Primary

  Laser speckle optics · CPC title

• G03B21/2066

  Reflectors in illumination beam (in projection beam G03B21/28) · CPC title

• G03B21/28

  Reflectors in projection beam {(in illumination beam G03B21/2066)} · CPC title