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. 26, 2013
Filed:
Aug. 04, 2009
Applicants:
Kuniko Kojima, Tokyo, JP;
Hayato Takeuchi, Tokyo, JP;
Tomohiro Sasagawa, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Inventors:
Kuniko Kojima, Tokyo, JP;
Hayato Takeuchi, Tokyo, JP;
Tomohiro Sasagawa, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Assignee:
Mitsubishi Electric Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/14 (2006.01); G03B 21/28 (2006.01); G03B 21/56 (2006.01); G02B 3/08 (2006.01); G02B 13/20 (2006.01); G02B 5/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
An image formed on a reflecting optical modulator is magnified by a projection optical system and projected on a backside of a transmission-type screen. The projection optical system is constituted so that a product of an F-number and a projection magnification of the projection optical system is less than 400.