Patent ID: 8068751
Filing Date: 2011-11-29
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a photosensitive member; a drive unit configured to rotate said photosensitive member by a drive motor; an exposure unit configured to emit a light for exposing said photosensitive member; a storage unit configured to store correction data for correcting a light quantity of said exposure unit in association with exposure positions on said photosensitive member; a first generation unit configured to generate a first signal in response to a reference position provided on said photosensitive member passing a predetermined position while said photosensitive member is rotating; a second generation unit configured to generate a second signal in accordance with rotation of said photosensitive member, a plurality of generation periods of the second signals being included in one generation period of the first signal; and a control unit configured to, while during an acceleration control in which said photosensitive member is controlled to accelerate by said drive unit, count the second signals in response to input of the first signal, identify based on a count value of the second signals an exposure position when said photosensitive member is switched from the acceleration control to a constant-speed control in which said photosensitive member is controlled to maintain a constant speed by said drive unit, read correction data corresponding to the identified exposure position from said storage unit, and control the light quantity of said exposure unit based on the correction data read from said storage unit.