Patent ID: 7355770
Filing Date: 2008-04-08
Classification: B41J,G02B

Abstract:
1. An optical scanning unit comprising: a plurality of light sources that emits a plurality of light beams; a light deflector that is common to the light beams, and deflects each of the light beams from the light sources; and a scanning optical system that focuses each of the light beams deflected by the light deflector on a corresponding scanning surface, wherein the light beams from the light sources include a light beam that makes an angle in a secondary scanning direction with respect to a normal to a reflecting surface of the light deflector and a light beam that is horizontal in the secondary scanning direction with respect to the normal to the reflecting surface of the light deflector, wherein a scanning lens or a part of a scanning lens corresponding to the light beam that makes an angle with respect to the normal to the reflecting surface of the light deflector includes a surface that does not have a curvature in the secondary scanning direction and that is tilted and decentered in the secondary scanning direction.