Patent ID: 8977186
Filing Date: 2015-03-10
Classification: G03G

Abstract:
1. A drive transmission system comprising: a drive source including a rotating shaft, a magnet supported by the rotating shaft, and a plurality of electromagnets that are arranged in a circumferential direction of the rotating shaft and that surround the magnet, the drive source being configured to drive the rotating shaft to rotate by a predetermined rotation angle by exciting at least one of the plurality of electromagnets in accordance with an input of an input signal and by periodically changing a magnetic pole to which each of the plurality of electromagnets is excited in response to an input of the input signal; and a gear supported by the rotating shaft, wherein the least common multiple of a second frequency and a third frequency exceeds a threshold value that is a predetermined value based on an audible frequency range audible to the human ear, the second frequency being a value obtained by multiplying a number of rotations of the drive source per unit time by a number of teeth of the gear, the third frequency being a value obtained by dividing the first frequency by a number of steps per cycle,