Patent ID: 7561830
Filing Date: 2009-07-14
Classification: G03G

Abstract:
1. A rotation device comprising: a rotation member; a rotation driving source to control a rotation speed of the rotation member; a transmission mechanism to transmit a rotation from the rotation driving source to the rotation member by decreasing the rotation speed of the rotation driving source, the transmission mechanism decreasing the rotation speed at a non-integer gear ratio; a rotation pulse generation mechanism to generate a pulse at a rotation angle of the rotation member; a target value arrangement mechanism to arrange a target value of the rotation speed of the rotation driving source, the target value arrangement mechanism including a rotation unevenness provision mechanism to impart a plurality of kinds of sine-wave unevenness to the rotation speed target value; a correction value computation mechanism configured to determine the correction value to adjust rotation fluctuation caused by a rotation axis eccentricity component of the rotation driving source and at least one noise component having a cycle relationship with a rotation cycle of the rotation member based on a time interval of a pulse train generated every rotation of the rotation member by the rotation pulse generation mechanism when the plurality of kinds of rotation unevenness are imparted to the rotation speed target value; and a control mechanism to control an output rotation speed of the rotation driving source according to the correction value determined by the correction value computation mechanism.