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:
Aug. 19, 2014
Filed:
Mar. 05, 2012
Tatsuya Takahashi, Kanagawa, JP;
Kazuhiro Fujita, Tokyo, JP;
Issei Abe, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image projection apparatus includes: an optical image generating unit to generate an optical image based on image data; a projection surface; a projection optical system including a plurality of optical elements and configured to form an projected image, onto a projection surface, coupled with the optical image generated by the optical image generating unit; a projected image shifting unit to shift the projected image by changing a posture of at least one of the plurality of optical elements included in the projection optical system; a tilt sensor to detect a posture of the optical element of which posture is changed by the projected image shifting unit; and a trapezoidal distortion correction unit to correct the optical image generated by the optical image generating unit so as to prevent the trapezoidal distortion of the projected image from occurring based on the detection result of the tilt sensor.