公开(公告)号：SG100716A1

公开(公告)日：2003-12-26

申请号：SG200103267

申请日：2001-06-01

Applicant: IBM

Inventor： NHAN XUAN BUI ,  JOHN ALEXANDER KOSKI ,  AKIMITSU SASAKI ,  KAZUHIRO TSURUTA

IPC: G11B5/584 ,  G11B7/09 ,  G11B21/10 ,  G11B5/596

Abstract: A servo system and method position a head laterally with respect to defined servo tracks, employing fine and coarse actuators. A servo control integrates the position error between the head and a desired position in accordance with a predetermined function, and operates the coarse actuator to translate the fine actuator and the head in accordance with the integrated position error. A position error signal loop is coupled to a servo sensor for determining position error for operating the fine actuator to translate the head in a manner to reduce the position error. The position error signal loop may have a compensator function with both integration and other functions. A coarse servo control comprises a connection coupled to the compensator function for providing an integration control representing the integration function of the position error signal loop; and a driver coupled to the connection, operating the coarse actuator to translate the fine actuator and the head in accordance with the integration signal.