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:
Jan. 02, 2007
Filed:
Oct. 29, 2003
Fumie Kawai, Gifu, JP;
Kazuhiro Nishida, Matsumoto, JP;
Shuji Narimatsu, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A projector having a cross-dichroic prism () synthesizing three kinds of red, green, and blue light emitted from liquid crystal panels (); and a projection lens () projecting the synthesized light and also having polarizing plates () disposed on the optical paths between the corresponding liquid crystal panels () and the cross-dichroic prism () includes a lens element (), serving as an optical element for compensating chromatic aberration of magnification, which is formed on and integrally with one surface of the polarizing plate () disposed on the light path of the red light and which adjusts the size of the projected image screen of the red light extending along at least a predetermined direction so as to be nearly equal to those of the projected image screens of the other kinds of color light extending along the predetermined direction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile