Patent ID: 6731419
Filing Date: 2004-05-04
Classification: G02B

Abstract:
A scanning optical system for emitting a plurality of laser beams scanning in a main scanning direction, comprising:a deflector that deflects a plurality of laser beams to scan in the main scanning direction; and an imaging optical system that converges the plurality of laser beams deflected by said deflector to form a plurality of beam spots on surfaces to be scanned, respectively, the plurality of beam spots scanning on the surfaces to be scanned in the main scanning direction, respectively, wherein said imaging optical system has at least one lens whose position is changeable in a plane including an optical reference axis thereof and parallel with the main scanning direction, wherein said imaging optical system satisfies a condition: 0.05f/fL|<0.5 â€ƒwhere, f represents a focal length of said imaging optical system in the main scanning direction; and fL represents a focal length of said at least one lens in the main scanning direction.