Patent ID: 8310516

Claim:
A light scanning apparatus having plural light sources, comprising: a light source control unit configured to control the light sources to form L (L≧2) light beam arrays aligned in a sub scanning direction each of which L light beam arrays are formed by causing M ((N−1) M≧1) light sources out of N (N≧2) light sources assigned to each of the L light beam arrays to emit light as M light emitting sources, wherein each of the L light beam arrays forms a pixel and a total of L pixels aligned in the sub scanning direction are formed; and a pixel-position-in-sub-scanning-direction detecting unit configured to detect a position of a pixel in the sub scanning direction and to generate correction data containing information to correct a position of a centroid of the pixel in the sub scanning direction, wherein the light source control unit is configured to control the M light emitting sources to shift the centroid of the pixel a distance in the sub scanning direction according to the correction data generated by the pixel-position-in-sub-scanning-direction detecting unit.