Patent ID: 8471877

Claim:
An image forming apparatus for forming an image by overlapping a plurality of monochromatic images respectively received from a plurality of photosensitive media, comprising: a singular light scanning unit having a double-sided mirror scanner configured to rotationally oscillate, the scanner having at least one pair of oppositely facing mirrors each configured to deflect light, the light scanning unit being configured to scan a plurality of light beams deflected by the at least one pair of oppositely facing mirrors across surfaces of the plurality of photosensitive media along a main scanning direction, wherein one or more distances, along a sub-scanning direction substantially perpendicular to the main scanning direction, between respective light beam spots formed on the plurality of photosensitive devices by the plurality of light beams are adjustable; wherein the light scanning unit is configured to adjust the one or more distances along the sub-scanning direction between the light beam spots such that a distance in the sub-scanning direction between a first light beam spot and a second light beam spot formed on a first and second ones of the plurality of photosensitive media, respectively, is substantially one half of a cycle of scan lines in the sub-scanning direction.