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. 16, 2016
Filed:
May. 08, 2014
Applicants:
Yohei Takano, Kanagawa, JP;
Hibiki Tatsuno, Kanagawa, JP;
Nobuyuki Arai, Kanagawa, JP;
Hirotoshi Nakayama, Kanagawa, JP;
Inventors:
Yohei Takano, Kanagawa, JP;
Hibiki Tatsuno, Kanagawa, JP;
Nobuyuki Arai, Kanagawa, JP;
Hirotoshi Nakayama, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03B 21/28 (2006.01); G02B 17/08 (2006.01); G03B 21/14 (2006.01); G02B 13/16 (2006.01);
U.S. Cl.
CPC ...
G03B 21/28 (2013.01); G02B 17/08 (2013.01); G02B 17/0852 (2013.01); G02B 17/0896 (2013.01); G02B 13/16 (2013.01); G03B 21/14 (2013.01);
Abstract
There is provided a projection optical system capable of projecting an image formed on an image forming unit on a projection plane, which has an extremely short projection distance and a small size.