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:
Feb. 17, 2015
Filed:
Nov. 20, 2012
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Hiroaki Yanai, Matsumoto, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 21/14 (2006.01); G03B 21/16 (2006.01); G02B 5/30 (2006.01); G02B 27/28 (2006.01); G03B 35/26 (2006.01); H04N 13/04 (2006.01);
U.S. Cl.
CPC ...
G03B 21/16 (2013.01); G02B 5/3025 (2013.01); G02B 27/286 (2013.01); G03B 35/26 (2013.01); H04N 13/0434 (2013.01);
Abstract
An external polarization conversion device used for a projector includes a first element which converts light from the projector to polarized light in a uniform polarization direction, and a second element which is arranged in a position subsequent to the first element in such a way that there is a space between the first element and the second element and which converts the polarized light from the first element to predetermined polarized light that is different from the polarized light from the first element.