Patent ID: 6714332
Filing Date: 2004-03-30
Classification: B41J,G02B

Abstract:
A scanning optical system for emitting a beam scanning in a main scanning direction, comprising:a light source that emits a beam; a cylindrical lens that converges the beam emitted by said light source in an auxiliary scanning direction which is perpendicular to the main scanning direction; a polygonal mirror that rotates and deflects the beam emerged from said cylindrical lens to scan in the main scanning direction; and an optical element that has a reflection surface to reflect the beam deflected by said polygonal mirror, said optical element converging the beam deflected by said polygonal mirror on a surface to be scanned to form a beam spot, the beam spot scanning on the surface to be scanned, wherein said cylindrical lens is arranged such that the beam, which enters into said cylindrical lens and exits from said cylindrical lens without being reflected by inner surfaces of said cylindrical lens, is deflected in the auxiliary scanning direction by said cylindrical lens and is incident on said polygonal mirror.