Optical scanner for laser printer, has scanning lens, where one of refraction and reflection surfaces of lens is surface with curvature radius that is changed in direction perpendicular to plane that is continuously scanned with rays

摘要

The scanner has an optical deflecting unit (5) deflecting rays that are emitted by a light source (1). A scanning lens (6) scans a surface that is to e scanned and has refraction and reflection surfaces to refract and reflect the rays, where one of the refraction and the reflection surfaces is the surface with curvature radius that is changed in a direction perpendicular to a plane that is continuously scanned with the rays. An independent claim is also included for an image forming device comprising an optical scanner.