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:
Mar. 07, 2006
Filed:
May. 26, 2004
Kazuhiro Nishida, Matsumoto, JP;
Akira Momose, Nagano, JP;
Kazuhiro Nishida, Matsumoto, JP;
Akira Momose, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An illumination device includes: a light source; a polarization converter () that converts a light beam irradiated by the light source into a substantially uniform linear polarized light, the polarization converter () being slanted relative to a central axis of the light beam irradiated by the light source and including a plurality of polarization-separating films () and a plurality of light reflection films () alternately arranged in a direction substantially orthogonal to the central axis of the light beam irradiated by the light source; an optical filter () provided between the light source and the polarization converter () and having a plurality of optical conversion layers, which are formed striped with the pitch thereof corresponding to the arrangement of the polarization-separating films () to optically convert the incident light beam; a holder frame () that holds the optical filter (); and a filter-driving mechanism () that moves the holder frame () in a direction in which the polarization-separating films () are arranged.