| 摘要 |
On an information record medium, a plurality of synchronization signals are recorded by a predetermined record interval such that a record interval of two consecutive synchronization signals is transiently changed from the predetermined record interval. A method of controlling a rotation of a motor to rotate the information record medium is provided with the steps of: detecting the synchronization signals one after another from the information record medium; generating a standard signal having a predetermined cycle which is set in advance in correspondence with the predetermined record interval; detecting a changing amount of an interval, at which the synchronization signals are detected by the synchronization signals detecting steps, from the predetermined record interval; and controlling the rotation of the motor to be in a predetermined rotation condition corresponding to the predetermined cycle by canceling the changing amount detected by the changing amount detecting step, on the basis of the standard signal generated by the standard signal generating step and the changing amount detected by the changing amount detecting step.
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