| 摘要 |
An image forming apparatus is disclosed that has an optical device including an optical source that is driven corresponding to image data, a deflection unit that deflects an optical beam output from the optical source in a main scanning direction, and an optical element that reflects the optical beam onto a photosensitive drum; a detection device that is arranged outside the optical device and detects a positional shift of the optical beam in a sub-scanning direction defined as a direction orthogonal to the main scanning direction; and a control unit that corrects the positional shift in the sub-scanning direction using an output from the detection device. |
