| 摘要 |
In order to access to a destination track, a CPU compares a present track number and a destination track number to derive out the track difference and the transfer direction of an objective lens in an optical head. Then, it derives out the sum of transfer time and processing time and determines whether or not sector "0" is passed during the total period of time. If it is determined that sector "0" is passed and when the objective lens is transferred inwardly of an optical disk, the number of tracks obtained by adding one to the track difference is supplied to a tracking controller. Then, the tracking controller drives a driving coil according to the received number of tracks so as to set the objective lens to the destination track. Further, if it is determined that sector "0" is passed and when the objective lens is transferred outwardly of the optical disk, the number of tracks obtained by subtracting one from the track difference is supplied to the tracking controller. Then, the tracking controller drives the driving coil according to the received number of tracks so as to set the objective lens to the destination track.
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