| 摘要 |
An image forming apparatus includes a light beam generation unit, a light deflector having a resonance frequency and deflecting a light beam, a photosensitive member to which the deflected light beam is irradiated, and a driving control unit driving and controlling the light deflector. The driving control unit can measure a difference between a frequency of a light-deflector driving signal and the light-deflector resonance frequency and a non-drawing time during which an image is not formed by the light deflector. When the difference between the frequency of the driving signal and the light-deflector resonance frequency is equal to or larger than a predetermined value and the non-drawing time is equal to or longer than a predetermined time, the driving control unit produces the driving signal having a frequency corresponding to the resonance frequency of the light deflector and supplies the produced driving signal to the light deflector.
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