Patent ID: 7463279
Filing Date: 2008-12-09
Classification: G03G

Abstract:
1. An image forming apparatus for forming an image, by scanning in a main scanning direction laser beams emitted from a plurality of lasers, wherein the plurality of lasers are arranged being evenly spaced not longer than one-pixel length apart from each other in a sub-scanning direction, and arranged being spaced a predetermined distance apart from each other in the main scanning direction, and one pixel is formed by making laser beams from the plurality of lasers overlap, the image forming apparatus comprising: a detection unit configured to detect displacement, in the sub-scanning direction, of the main scanning line of a laser beam from one of the plurality of lasers, from a reference position in the sub-scanning direction; a decision unit configured to decide an allotted amount of light for each of the plurality of lasers in accordance with the displacement detected by said detection unit; and a control unit configured to control to drive each of the plurality of lasers in accordance with the allotted amount of light for each of the plurality of lasers decided by said decision unit, wherein, in a case where the displacement detected by said detection unit is upward from the reference position in the sub-scanning direction, said decision unit decides allotment of light to the plurality of lasers in such a way that allotted amounts of light for the lasers situated at lower side in the sub-scanning direction are larger, and, in a case where the displacement is downward from the reference position in the sub-scanning direction, said decision unit decides allotment of light to the plurality of lasers in such a way that allotted amounts of light for the lasers situated at upper side in the sub-scanning direction are larger.