Image forming apparatus that scans photosensitive member using plurality of scan beams

An image forming apparatus, comprising:

• a photosensitive member;
• a scan unit including at least a first light source and a second light source, the scan unit being configured to form an electrostatic latent image on the photosensitive member by emitting a first scan beam from the first light source and scanning a plurality of sections on the photosensitive member in a main scanning direction at an inconstant scan speed, and to form an electrostatic latent image on the photosensitive member by emitting a second scan beam from the second light source and scanning the plurality of sections on the photosensitive member in the main scanning direction at an inconstant scan speed;
• and
• a control unit configured to receive image signals for a plurality of pixels and to perform:
• a first partial magnification correction for emitting the first scan beam from the first light source by changing a light emission interval of the first scan beam per pixel in accordance with which section in the main scanning direction is scanned by the first scan beam, when a region on the photosensitive member scanned by the first scan beam and the second scan beam is divided into the plurality of sections in the main scanning direction,
• a first density correction for emitting the first scan beam from the first light source by changing pulse widths of the image signals corresponding to an electrostatic latent image formed by the first scan beam in accordance with which section in the main scanning direction is scanned by the first scan beam,
• a second partial magnification correction for emitting the second scan beam from the second light source by changing a light emission interval of the second scan beam per pixel in accordance with which section in the main scanning direction is scanned by the second scan beam, and
• a second density correction for emitting the second scan beam from the second light source by changing pulse widths of the image signals corresponding to an electrostatic latent image formed by the second scan beam in accordance with which section in the main scanning direction is scanned by the second scan beam.