Patent ID: 6844892

Claim:
A multi-beam scanning device, comprising: a light source having a plurality of light emitting elements arranged in a line to emit a plurality of laser beams; a main deflector having a reflecting surface, said reflecting surface deflecting the laser beams so that the laser beams scan across an object surface in a main scanning direction, said object surface being moved in an auxiliary scanning direction perpendicular to the main scanning direction; an image forming optical system disposed between said main deflector and the object surface so that said reflecting surface of said main deflector is optically conjugated to the object surface in the auxiliary scanning direction; a cylindrical lens group disposed between said light source and said main deflector, said cylindrical lens group converging, in the auxiliary scanning direction, each of the laser beams in a vicinity of said reflecting surface of said main deflector; a deflecting element disposed between said light source and said cylindrical lens group, said deflecting element deflecting the laser beams in the auxiliary scanning direction; and a deflecting element supporting mechanism movably supporting said deflecting element so as to allow adjustment of the traveling direction of the laser beams deflected by said deflecting element.