| 摘要 |
An image forming apparatus to form a color image by using a plurality of laser units, each simultaneously scanning a plurality of scanning lines in a main scanning direction to write with laser beams emitted from a plurality of laser light sources. The apparatus includes: a control unit to control each of the laser units, which includes a reference laser light source and another laser light source, such that, while the laser light sources are synchronized with a clock, a write-start position of a laser beam emitted from the another laser light source is matched with a reference write-start position of a laser beam emitted from the reference laser light source, wherein the control unit selects in advance the reference laser light source in every laser units, based on a previously measured displacement between the plurality of laser beams in each of the laser units.
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