Patent ID: 7918523

Claim:
An image forming apparatus comprising: a rotating body that rotates and holds a plurality of recording media on a circumferential surface of the rotating body; an image forming section that forms an image on the recording media held on the rotating body when rotating; a generating section that generates a pulse signal according to the rotation amount of the rotating body and generates a reference pulse for every rotation cycle of the rotating body; a measuring section that measures the number of pulses of the pulse signal; a computing section that each time when a predetermined number of pulses from the time of generation of the reference pulse has been measured, divides a time of a pulse width of a pulse before the predetermined number of pulses by a first value to compute a pulse division time, the predetermined number of pulses being predetermined for each of the plurality of recording media; and a controlling section that each time when the predetermined number of pulses are measured from the time of generation of the reference pulse, multiplies the pulse division time by a second predetermined value, thereby obtaining a forming start time, and that controls the image forming section so as to start image formation when the forming start time has elapsed from the time of measurement of the predetermined number of pulses, the second predetermined value being predetermined for each of the plurality of recording media.