Patent ID: 7675531

Claim:
An image forming apparatus capable of forming wide images, comprising: an exposing unit having a plurality of LED heads wherein longitudinal directions of the respective LED heads are parallel to a main scanning direction, adjacent LED heads partially overlap each other in a direction perpendicular to the main scanning direction, a resolution of an LED row formed in at least one of the plurality of LED heads is higher than that of image data in the main scanning direction; and a lighting control unit that controls to turn on or turn off dots in the LED row such that an exposed position of a photoconductive drum is moved in units of a dot of the LED row; wherein a plurality of the dots in the LED row are used to form a single image pixel; wherein when a white streak occurs, the lighting control unit controls to turn off a dot in a middle of the LED and to correspondingly shift each pixel in the LED row toward end portions of the LED row, and when a black streak occurs, the lighting control unit controls to provide, in a middle of the LED row, a portion that exposes one pixel by dots which are less in number than dots in another LED row to expose one pixel and to correspondingly shift each pixel toward a center of the LED row.