| 摘要 |
A ZONE WHERE HEAD IS POSITIONED IS DETERMINED IN A TRACK TO BE ONE OF ZONES 1 TO 4 ACCORDING TO A COMBINATION OF THE POLARITIES OF PHASE-A AND PHASE-B DETECTION OUTPUTS HAVING DIFFERENT PHASES, AND THE POSITIONAL DEVIATION OF THE HEAD FROM THE CURRENT POSITION TO THE CENTER OF THE TARGET TRACK IS OBTAINED FROM THE PHASE-B DETECTION OUTPUT IN THE ZONE. THE PHASE-B DETECTION OUTPUT ID PROVIDED WITH A DEAD ZONE (25) CORRESPONDING TO A RANGE WHERE BOTH DETECTION OUTPUTS HAVE A PHASE-DIFFERENCE ERROR. THEREFORE, EVEN IF THE PHASE DIFFERENCE HAS AN ERROR, THE POSITIONAL DEVIATION OF THE HEAD IS ACCURATELY CALCULATED.
|
