Patent ID: 6731417
Filing Date: 2004-05-04
Classification: B41J,G02B

Abstract:
A scanning optical system used for exposing a predetermined imaging area on a surface to be scanned to a plurality of laser beams, comprising:a plurality of light sources that emit a plurality of laser beams having different wavelengths, respectively; a single deflector which deflects the plurality of laser beams simultaneously; an imaging optical system that converges the plurality of laser beams deflected by said single deflector on the surface to be scanned, lateral chromatic aberration of said imaging optical system being compensated; a beam detector that receives the plurality of laser beams directed to outside the predetermined imaging area, a synchronizing signal being generated upon detection of each of the plurality of light beams by said beam detector; a dispersion element inserted in optical paths of the laser beams directed to said beam detector, said dispersion element being configured such that the laser beams directed to said beam detector are shifted in the scanning direction.