公开(公告)号：JP2002015532A

公开(公告)日：2002-01-18

申请号：JP2001170742

申请日：2001-06-06

Applicant: IBM

Inventor： NAAN KUSAN BUI ,  KOSKI JOHN ALEXANDER ,  SASAKI AKIMITSU ,  TSURUTA KAZUHIRO

IPC: G11B5/584 ,  G11B7/09 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To remove a relative position sensor, while enabling tracking of a micromotion actuator by a coarse motion actuator. SOLUTION: The servo system and the method position a head in the lateral direction to a prescribed servo track, by using the micromotion actuator and the coarse motion actuator. A servo control integrates a position error between the head and a desired position according to a prescribed function, operates the coarse motion actuator to move the micromotion actuator and the head in translational motion according to position errors integrated. The position error is determined by combining a position error signal loop with a servo sensor, the micromotion actuator is operate, so that the position error is reduced, and then the translational motion of the head is performed. The position error signal loop has a compensator function, having an integration function and other functions. The coarse motion servo control is combined with the compensator function and includes connection which provides the integration control indicating the integration function of the position error signal loop, and a driver which is combined with the connection and operates the coarse motion actuator to move micromotion actuator and the head in translational motion in accordance with an integrated signal.