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:
Apr. 19, 2016
Filed:
Dec. 19, 2013
Applicant:
Yoshio Kubo, Tokyo, JP;
Inventor:
Yoshio Kubo, Tokyo, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/16 (2006.01); G03B 21/28 (2006.01);
U.S. Cl.
CPC ...
G03B 21/16 (2013.01); G03B 21/28 (2013.01);
Abstract
An image projection apparatus includes an optical part disposed in a light path of an projection image; an enclosing unit to enclose the light path of the projection image and having an window for projecting the projection image onto a projection plane; and an air supply unit to supply air into an internal space of the enclosing unit enclosing the light path. Pressure of the internal space of the enclosing unit is kept at a positive pressure with respect to an external pressure of the enclosing unit during an image projection operation.