| 摘要 |
A control unit for a copying machine is equipped with a first rotation speed detecting unit for detecting a first rotation speed as a rotation speed of a polygon mirror; a switching judging unit for judging whether the first rotation speed reaches a value equal to or higher than a first switching speed set in advance; and a driving control unit for causing a second motor to start driving of a photoconductive drum, while causing a first motor unit to stop driving of polygon mirror for a mirror stop period set in advance, in the case that the switching judging unit judges that the first rotation speed reaches a value equal to or higher than the first switching speed, and, after the mirror stop period is over, causes the first motor to restart driving of the polygon mirror.
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