Patent Number: 6,683,707

Title: Scanning optical apparatus and image forming apparatus using the same

Abstract: An object of the present invention is to provide a scanning optical apparatus that is capable of suppressing, to a minute amount, scanning line bending caused by rotational decentration of a single lens that is a scanning optical system, and to provide an image forming apparatus using the optical scanning apparatus. To achieve the stated object, with the technique of the present invention, a single lens is used as a scanning optical system and the surface shape of the single lens is set so that a direction of scanning line bending in the sub scanning direction occurring when an incident surface of the single lens is rotationally decenter about an axis parallel to the main scanning direction is opposite to a direction of scanning line bending in the sub scanning direction occurring when an exit surface is rotationally decenter about the axis parallel to the main scanning direction.

Inventors: Ishihara; Keiichiro (Tochigi, JP), Sato; Hiroshi (Tochigi, JP), Kato; Manabu (Tochigi, JP), Shimomura; Hidekazu (Kanagawa, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G02B 26/12 (20060101); G02B 13/00 (20060101); G02B 026/08 ()

Expiration Date: 01/27/2021