公开(公告)号：MY134153A

公开(公告)日：2007-11-30

申请号：MYPI20013749

申请日：2001-08-09

Applicant: IBM

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

IPC: G11B21/08 ,  G11B5/55 ,  G11B5/58 ,  G11B5/584 ,  G11B21/10

Abstract: A METHOD AND POSITION CONTROL FOR A SERVO SYSTEM FOR POSITIONING A HEAD LATERALLY WITH RESPECT TO DEFINED SERVO TRACKS. THE SERVO SYSTEM COMPRISES A SERVO SENSOR AND DETECTOR FOR SENSING LATERAL POSITION OF THE HEAD AND A COMPOUND ACTUATOR HAVING A FINE ACTUATOR PORTION AND A COARSE ACTUATOR PORTION. THE POSITION CONTROL PROVIDES POSITION INDICATIONS FOR THE COARSE ACTUATOR PORTION, WHICH MAY COMPRISE A TABLE RELATING PREDETERMINED NOMINAL LATERAL POSITION INDICATIONS TO THE DEFINED SERVO TRACKS. THE POSITION CONTROL POSITIONS THE COARSE ACTUATOR PORTION AT AN ESTIMATED POSITION WITH RESPECT TO THE DEFINED SERVO TRACKS, AND RESPONDS TO THE SERVO SENSOR TO DETERMINE WHICH SERVO TRACK IS CLOSEST TO THE ESTIMATED POSITION. THE POSITION CONTROL SETS THE COARSE ACTUATOR PORTION POSITION INDICATION TO THE PREDETERMINED NOMINAL LATERAL POSITION INDICATION OF THE CLOSEST DEFINED SERVO TRACK, E.G., BY LOOKING IT UP IN THE TABLE. THIS THEREBY CORRECTS THE INDICATION OF THE POSITION OF THE COARSE ACTUATOR PORTION.@@FIGURE 6 THE MOST ILLUSTRATIVE DRAWING.