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. 21, 2007
Filed:
Oct. 14, 2004
Koshi Hatakeyama, Tochigi, JP;
Tsunefumi Tanaka, Kanagawa, JP;
Koshi Hatakeyama, Tochigi, JP;
Tsunefumi Tanaka, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed a projection optical system which is capable of moving a projected image within a predetermined region (effective projection region). The projection optical system, which projects an image of an object surface in the effective projection region of a predetermined image surface comprises two or more optical systems, among which a first optical system on the object surface side comprises a zoom portion which zooms the projected image. The projection optical system further comprises one or more rotatable members which rotate around the position of an exit pupil of the first optical system or its vicinity. In addition, by rotating the one or more rotatable members, the projected image is moved within the effective projection region.