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. 03, 2012
Filed:
Dec. 09, 2008
Ryuhei Amano, Hirakata, JP;
Takashi Ikeda, Higashi-Osaka, JP;
Shinichi Okuno, Hirakata, JP;
Osamu Nagase, Hanamaki, JP;
Yoshitsugu Kohno, Hanamaki, JP;
Ryuhei Amano, Hirakata, JP;
Takashi Ikeda, Higashi-Osaka, JP;
Shinichi Okuno, Hirakata, JP;
Osamu Nagase, Hanamaki, JP;
Yoshitsugu Kohno, Hanamaki, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Ricoh Optical Industries Co., Ltd., Hanamaki, JP;
Abstract
A projection optical system includes a first refracting optical system having a plurality of lenses, a first reflecting optical system, and a second reflecting optical system. The first reflecting optical system is disposed on a side of a projection port with respect to an optical axis of the first refracting optical system, and has a positive optical power to reflect light incident through the first refracting optical system in a direction opposite to the side of the projection port. The second reflecting optical system is operable to reflect the light reflected on the first reflecting optical system toward the projection port.