Patent ID: 8619107

Claim:
An optical scanning device which includes one or more optical deflectors deflecting one or more light beams from one or more light sources, and one or more scanning/focusing optical systems focusing each deflected light beam on each of one or more surfaces of photoconductive mediums as an optical spot thereon, and the optical scanning device performing optical scanning of each of the one or more surfaces of the photoconductive mediums, comprising: a scanning line compensation unit compensating an inclination of a scanning line and/or a deflection of a scanning line on the one or more scanned surfaces; and a position-error compensation unit compensating a position error in a main scanning direction of the optical spots corresponding to adjoining pixels resulting from the compensation of the scanning line compensation unit, wherein the scanning line compensation unit is configured to mechanically vary an optical path of the deflected light beam, and a change of a spacing in the main scanning direction of optical spots corresponding to adjoining pixels being produced by the compensation of the scanning line compensation unit, and the position-error compensation unit is configured to compensate the change of the spacing in the main scanning direction of the optical spots corresponding to the adjoining pixels by adjustment of a timing of respective startings and endings of application of an image signal applied in the main scanning direction of the optical spots, and an amount of the compensation of the spacing change being varied in accordance with a position in the main scanning direction so that respective spacings in the main scanning direction of the optical spots corresponding to the adjoining pixels for two adjoining positions on each of the one or more scanned surfaces are different from each other.