The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2009
Filed:
Apr. 17, 2007
Kazuhiro Nishida, Matsumoto, JP;
Katsuyuki Uehara, Azumino, JP;
Kazuhiro Nishida, Matsumoto, JP;
Katsuyuki Uehara, Azumino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A projector includes a light source, an illumination optical system, and a color separating optical system. The color separating optical includes a dichroic mirror which reflects a first color light component of an illumination light through a first optical path by a reflection angle and transmits a second light component through a second optical path; a first mirror which bends the first optical path by a first bent angle; and a second mirror which bends the second optical path by a second bent angle. The reflection angle, the first bent angle, and the second bent angle are arranged to provide a predetermined difference between the length of the first optical path and the length of the second optical path, and the predetermined difference corresponding to a difference between focal distances of a superimposing optical element corresponding to the first and second light components.