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:
Dec. 22, 2009
Filed:
Dec. 12, 2007
Osamu Ishibashi, Matsumoto, JP;
Kazuhiro Nishida, Matsumoto, JP;
Osamu Ishibashi, Matsumoto, JP;
Kazuhiro Nishida, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
To provide a projector capable of increasing F number of an illumination system without enlarging the size of the illumination system or the like. A combining lensoperating in cooperation with a superimposing lensis provided only in a first section between a first dichroic mirrorand a red light reflection mirroras a bending mirror on a first optical path OPextending from the superimposing lensto a first liquid crystal display panel. Thus, the F number of an illumination systemassociated with blue light can be controlled with high degree of freedom, and the number of lenses constituting a color separation and light guide systemand the illumination systemdoes not increase. Moreover, the incident angle of illumination light does not become large around the first liquid crystal display panel, and thus the telecentric characteristics of the illumination systemassociated with blue light can be secured.