| 摘要 |
<p>PURPOSE:To attain satisfactory tracking with respect to the eccentricity and deformation of a disk by using present tracking error data for the head jogging control of a disk rotation after one cycle. CONSTITUTION:A head position detection means 20 detects the present head position, and an addition means 21 adds head position data from the head position detection means 20 and tracking error data from tracking error detection parts 18 and 19, whereby an output from the addition means 21 is delayed by one cycle of the disk rotation. The jogging of a head 11 is controlled according to a difference between delay data from a delay means for one cycle 22 and head position data from the head position detection means 20. Thus, tacking control is attained with extreme precision even if the actual track position on the disk largely changes.</p> |
