Patent ID: 8279247

Claim:
An image forming apparatus comprising: a plurality of exposure units having a plurality of light emitting elements; a forming unit having at least one photoreceptor exposed by the plurality of exposure units, and configured to form an image on a body to be transferred, a first pattern based on exposure of one of the plurality of exposure units, and a second pattern based on exposure of another one of the plurality of exposure units; and a memory configured to store positional information that includes a larger number of positions of light emitting elements arranged in a central area than that of light emitting elements arranged in an end area in respective exposure units; a processor; wherein the memory further stores executable programming that, when executed by the processor, causes the image forming apparatus to provide: a calculation unit configured to calculate a first approximated line of the first pattern and a second approximated line of the second pattern based on the positional information; an acquisition unit configured to acquire a tilt angle error between the first approximated line and the second approximated line; and an adjustment unit configured to adjust at least one of a light emitting time lag of the plurality of light emitting elements and an angular error of the plurality of exposure units between the one of the plurality of exposure units and the other one of the plurality of exposure units to restrain the tilt angle error.