Patent ID: 7773898

Claim:
An image forming apparatus comprising: an image forming unit comprising a photosensitive member, a light source for emitting a light beam, a light source driving unit for causing the light source to emit the light beam, a deflecting scanning unit for scanning the light beam emitted from the light source, and a developing unit for developing an electrostatic latent image formed, on the photosensitive member, by the scanned light beam as a toner image; a control unit configured to cause the image forming unit to form a first toner pattern including multiple lines which extend to a first direction being a direction where the light beam is scanned and a second toner pattern including multiple lines which extend to a second direction being different from the first direction based on predetermined pattern image data; a reading unit configured to read the first toner pattern and the second toner pattern formed on the photosensitive member; and a correction unit configured to detect densities of the first toner pattern and the second toner pattern based on results of the reading by the reading unit, to generate correction data so that the densities of lines formed in the first direction and the second direction are equal or nearly equal, and to correct input image data based on the correction data; wherein the light source driving unit emits the light beam from the light source based on the input image data corrected by the correction unit.