Patent ID: 7446917
Filing Date: 2008-11-04
Classification: B41J,G02B,H04N

Abstract:
1. An optical scanning apparatus comprising: a first light source; a second light source disposed with deviation in a sub-scanning direction from the first light source; a deflector that deflects a first light beam emitted from the first light source and a second light beam emitted from the second light source, and that scans different scanned surfaces with the first and second light beams in a main-scanning direction; a first cylindrical lens having refracting power only in the main-scanning direction, the first cylindrical lens being provided on a first optical path between the first light source and the deflector, and the first light beam emitted from the first light source passing through the first cylindrical lens; a second cylindrical lens having refracting power only in the main-scanning direction, the second cylindrical lens being provided on a second optical path between the second light source and the deflector, the first and second cylindrical lenses being aligned in the sub-scanning direction, and the second light beam emitted from the second light source passing through the second cylindrical lens; and a wall including a plane that positions both of a side plane surface of the first cylindrical lens and a side plane surface of the second cylindrical lens in the main-scanning direction.