| 摘要 |
A rotary body drive device for controlling rotation of a motor on the basis of the phase difference between a periodic signal produced in accompaniment with rotation of the motor and a reference clock signal so that their phase relationship becomes a prescribed one. When the phase difference between both signals detected in a certain state is largely different from that detected in the preceding time, a correction is given to the phase difference of both signals detected in the aforesaid certain state, so that the rotation of said motor is controlled in accordance with the corrected phase difference.
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