Patent Number: 7,133,217

Title: Image-taking optical system and image input apparatus

Abstract: An image-taking optical system according to the present invention for forming an image of a two-dimensional object on an image-taking surface comprises a plurality of reflecting surfaces which reflect light from the two-dimensional object sequentially and guides the light to the image-taking surface, and a reference axis passing through the center of the pupil of the image-taking system and the center of the optical image formed on the image-taking surface is inclined with respect to the normal line of the two-dimensional object. The present invention provides an image-taking optical system which achieves a reduction in size, ensures a ratio of an amount of peripheral light, allows correction of trapezoidal distortion of a formed image, and is suitable for oblique image-taking.

Inventors: Chatani; Sawako (Tochigi, JP), Sunaga; Toshihiro (Tochigi, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G02B 17/00 (20060101); G02B 27/02 (20060101); G03B 21/28 (20060101)

Expiration Date: 2019-11-07 0:00:00