Light source device and projection device including the light source device

Patent metadata

Field	Value
Publication number	US-9155161-B2
Application number	US-201313753735-A
Country	US
Kind code	B2
Filing date	Jan 30, 2013
Priority date	Feb 3, 2012
Publication date	Oct 6, 2015
Grant date	Oct 6, 2015

Abstract

A light source device includes an LD module having a plurality of small light sources such as LDs, a control device selectively controlling On/Off of a plurality of the LDs, a first optical system collecting light emitted from the LDs into one collected light, and a second optical system emitting the collected light directly or through an optical process as source light. The control device maintains a constant amount of luminescence of the light source by controlling a number of the LDs selectively turned on in order to achieve a simple configuration of the light source device and a proper gradation expression of images.

First claim

What is claimed is:

1. A light source device, comprising:
a plurality of small light sources;
a light source control device configured to selectively control on/off of emissions from the plurality of small light sources;
a first optical system configured to collect the light emitted from the small light sources into one collected light; and
a second optical system configured to emit the collected light as source light, directly or with an optical-processing,
wherein the li…

Assignees

• Murai Toshiharu
• Ricoh Co Ltd

Inventors

• Murai Toshiharu

Classifications

• G03B21/204

  Physics · mapped topic

• H04N9/3111

  Electricity · mapped topic

• H04N9/3161

  Electricity · mapped topic

• G03B21/2033

  Physics · mapped topic

• H05B47/10 Primary

  Electricity · mapped topic