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:
Jul. 15, 2014
Filed:
Jul. 26, 2013
Atsushi Takaura, Tokyo, JP;
Kazuhiro Fujita, Tokyo, JP;
Issei Abe, Kanagawa, JP;
Akihiro Yamakage, Iwate, JP;
Osamu Nagase, Iwate, JP;
Yoshitsugu Kohno, Iwate, JP;
Atsushi Takaura, Tokyo, JP;
Kazuhiro Fujita, Tokyo, JP;
Issei Abe, Kanagawa, JP;
Akihiro Yamakage, Iwate, JP;
Osamu Nagase, Iwate, JP;
Yoshitsugu Kohno, Iwate, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A projection optical system includes first and second optical systems. The first optical system includes a transmissive-refractive element and the second optical system includes a reflective-refractive element. An image formed by a spatial light modulator is projected by the projection optical system on a projection surface. A light beam that travels along an optical path that leads from the second optical system to the projection surface in an optical path between a center of the image formed by the spatial light modulator and the projection surface is projected at an angle with respect to a normal to the projection surface. An optical axis of the first optical system is folded to a folded position by an optical path deflecting unit in an area of the first optical system where the light beam entering the optical path deflecting unit is a converging light beam or a substantially parallel light beam.