| 摘要 |
An image forming apparatus, includes an image forming unit including an image bearing member, a beam generating unit for generating a plurality of light beams and an optical scan system for scanning the image bearing member with the plurality of light beams to write an image, a beam detecting unit for detecting the plurality of light beams scanning the image bearing member at predetermined positions and obtaining a plurality of beam detection signals, a clock generating unit for generating a single clock signal, a controller for controlling the frequency of the single clock signal and a synchronization circuit for controlling the phase of the single clock signal in accordance with the plurality of beam detection signals obtained by the beam detecting unit, and generating a plurality of control clocks, wherein the plurality of beams are generated in accordance with the plurality of control clocks.
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