Patent ID: 8531497

Claim:
An image forming apparatus comprising: a light beam output unit configured to output a light beam; a deflection unit configured to deflection scan a photosensitive member in a main scanning direction by vibrating a mirror to reflect the light beam output from the light beam output unit onto the photosensitive member; a timing information detection unit configured to detect timing information for a first scan of the deflection scanning by the deflection unit during an image forming; a calculation unit configured to calculate a difference between: a target maximum wave amplitude of a frequency component of an angle between the mirror and the photosensitive member, and an maximum wave amplitude of the frequency component of the angle between the mirror and the photosensitive member in the first scan, the calculated difference calculated using the timing information for the first scan, the calculation unit further configured to calculate a correction amount of the main scanning direction for a next scan, the correction amount for attenuating non-periodic jitter of the minor caused by at least one of air resistance and turbulence, the correction amount calculated based on the calculated difference; a light beam modulation control unit configured to generate a light beam modulation signal for a second scan of image forming during the image forming based on image data and the correction amount calculated based on the timing information for the first scan; and a drive unit configured to drive the light beam output unit based on the light beam modulation signal.