Patent Number: 7,086,742

Title: Projection optical system

Abstract: A projection optical system is disclosed with which undistorted images can be obtained at any image position within a specification range, and whose projection angle can be changed. The projection optical system includes a plurality of optical elements and a first optical system constituted by at least one of the plurality of optical elements having the ability to form an image with light onto a predetermined surface different from the projection surface. A projection image of the original image can be moved by rotating a first optical element of the plurality of optical elements substantially around a center of an exit pupil position of the first optical system as the rotation center.

Inventors: Hatakeyama; Koshi (Tochigi, JP), Sunaga; Toshihiro (Tochigi, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G03B 21/28 (20060101); G02B 27/18 (20060101)

Expiration Date: 8/08/02018