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:
Sep. 10, 2013
Filed:
Sep. 02, 2008
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 apparatus capable of providing high image quality and having a reduced size is disclosed. The projection optical apparatus includes a light valve and a projection optical system including a first optical system having a transmissive-refractive element and a second optical system having a reflective-refractive element. An image formed on the light valve is projected by the projection optical system on a projection surface. The optical axis in the first optical system is folded both vertically and horizontally. The first group of the first optical system is contained in a space (dead space) whose lower limit is defined by a lower edge of the second optical system, thereby reducing the depth of the apparatus.