Patent ID: 7391430

Claim:
An image forming apparatus including a first light emitting device array unit and a second light emitting device array unit for drawing image data on a photoconductor, the first light emitting device array unit and the second light emitting device array unit being arranged in a main scanning direction corresponding to an axial direction of the photoconductor and being staggered in position in a sub-scanning direction, comprising: a ratio setting unit configured to set a ratio of fine size adjustment for finely adjusting a size of the image data; a computing unit configured to compute a displacement of the image data responsive to the ratio of fine size adjustment set by said ratio setting unit such that the displacement in the sub-scanning direction is obtained in terms of a number of lines in the main scanning direction; and a fine size adjustment unit configured to change intervals of occurrences of line synchronizing signals in response to the ratio of fine size adjustment set by said ratio setting unit, wherein the image data is supplied to the first light emitting device array unit and the second light emitting device array unit at respective timings, a difference of the respective timings corresponds to the displacement of the image data computed by the computing unit.