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.

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.

公开(公告)号：MY127261A

公开(公告)日：2006-11-30

申请号：MYPI20012652

申请日：2001-06-06

Applicant: IBM

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

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

Abstract: A SERVO SYSTEM (170) AND METHOD POSITION A HEAD LATERALLY WITH RESPECT TO DEFINED SERVO TRACKS, EMPLOYING FINE AND COARSE ACTUATORS (180, 182). 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 (171) 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 (185) 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 (211) COUPLED TO THE CONNECTION, OPERATING THE COARSE ACTUATOR TO TRANSLATE THE FINE ACTUATOR AND THE HEAD IN ACCORDANCE WITH THE INTEGRATION SIGNAL. (FIG. 6)