Patent ID: 7733041

Claim:
A device for driving a rotating-body, the device comprising: a rotation-driving source that outputs a rotation force; a transmission mechanism that transmits the rotation force of the rotation-driving source; a rotating-body that is connected to the transmission mechanism and that is rotated by the rotation force of the rotation-driving source; a plurality of detection target portions arranged around a rotating shaft of the rotating-body, one of the detection target portions causes a first detection signal to be generated, which is different from a second detection signal generated from other of the detection target portions; a detector that detects the detection target portions at a predetermined rotational-position, and generates the detection signals; a first reference-signal generating unit that generates a reference signal for indicating a reference rotational-position of the rotation-driving source or the rotating-body before one rotation of the rotation-driving source or the rotating-body from a timing of the first detection signal; a storage unit that stores measured values of periodic variation information about rotation velocity of the rotating-body, linked to phase of the rotating-body determined based on the reference signal; and a signal generating unit that reads the periodic variation information from the storage unit based on the reference signal, and generates a rotation-velocity correction signal for the rotation-driving source.