Scanning exposure device provided with intensity correction to compensate for scan angle

摘要

A scanning exposure device comprises a laser light source which emits a laser beam and a polygonal rotating mirror which reflects a laser beam emitted by the laser light source. The scanning exposure device scans the laser beam reflected by the polygonal rotating mirror on a surface of a photoconductive drum for exposure. The scanning exposure device is provided with an intensity correcting unit for correcting the intensity of the laser beam so that the intensity of the laser beam on the surface of the photoconductive drum does not vary regardless of variation of the incident angle of the laser beam falling on the polygonal rotating mirror as the polygonal rotating mirror rotates.