公开(公告)号：CA2413132A1

公开(公告)日：2002-02-21

申请号：CA2413132

申请日：2001-07-06

Applicant: IBM

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

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

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 (115) for sensing lateral position of the head (15 ) and a compound actuator (14) having a fine actuator portion (20) and a coars e actuator portion (16). The position control (116) provides position indications for the coarse actuator portion (16), which may comprise a table relating predetermined nominal lateral position indications to the defined servo tracks. The position control (116) positions the coarse actuator porti on (116) 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 th e estimated position. The position control (116) sets the coarse actuator portion (16) position indication to the predetermined nominal lateral positi on 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 (16).

公开(公告)号：DE10123069B4

公开(公告)日：2012-11-22

申请号：DE10123069

申请日：2001-05-11

Applicant: IBM

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

IPC: G11B5/56 ,  G11B5/584 ,  G11B7/09 ,  G11B21/10

Abstract: Verfahren zum Ansprechen eines Grobstellgliedes (182) eines Servosystems (170) zum seitlichen Positionieren einer Kopfeinheit, wobei das Servosystem (170) umfasst: – einen Servosensor (171) zum Erkennen der seitlichen Position der Kopfeinheit in Bezug auf definierte Servospuren, – ein Feinstellglied (180) zum seitlichen Verschieben der Kopfeinheit im Verhältnis zu den definierten Servospuren und – das Grobstellglied (182) zum seitlichen Verschieben des Feinstellgliedes (180) im Verhältnis zu den definierten Servospuren; gekennzeichnet durch folgende Schritte: – Erkennen des Positionierungsfehlers zwischen der Kopfeinheit und einer Wunschposition in Bezug auf die definierten Servospuren; – Integration des festgestellten Positionierungsfehlers entsprechend einer vorbestimmten Funktion; – Erzeugen eines Integrations-Steuersignals für das Grobstellglied (182) auf der Basis des integrierten Positionierungsfehlers; und – Ansprechen des Grobstellgliedes (182) mit dem Integrations-Steuersignal, so dass das Feinstellglied (180) und die Kopfeinheit entsprechend dem integrierten Positionierungsfehler verschoben werden.

公开(公告)号：DE10123069A8

公开(公告)日：2007-05-31

申请号：DE10123069

申请日：2001-05-11

Applicant: IBM

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

IPC: G11B5/56 ,  G11B5/584 ,  G11B7/09 ,  G11B21/10

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：CA2413132C

公开(公告)日：2006-09-19

申请号：CA2413132

申请日：2001-07-06

Applicant: IBM

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

IPC: G11B5/58 ,  G11B5/55 ,  G11B5/584 ,  G11B21/08 ,  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 (115) for sensing lateral position of the head (15) and a compound actuator (14) having a fine actuator portion (20) and a coarse actuator portion (16). The position control (116) provides position indications for the coarse actuator portion (16), which may comprise a table relating predetermined nominal lateral position indications to the defined servo tracks. The position control (116) positions the coarse actuator portion (16) 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 (116) sets the coarse actuator portion (16) 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 (16).

公开(公告)号：AT275753T

公开(公告)日：2004-09-15

申请号：AT01947656

申请日：2001-07-06

Applicant: IBM

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

IPC: G11B5/584

Abstract: A servo system and method position a head laterally with respect to magnetic tape longitudinal defined servo bands arranged in a longitudinally shifted pattern for identification, and separated by data tracks. A servo controller responds to a loss of lateral position, sensing an estimated longitudinal position of the magnetic tape. If the estimated longitudinal position is within a predetermined distance of an end of the tape, the servo controller operates a drive to continuously move the tape away from the sensed end. The servo controller senses a home lateral position sensor to determine whether a compound actuator is within a predetermined distance of the edge of the magnetic tape. If so, it operates the coarse actuator portion of the compound actuator to move laterally away from the edge of the magnetic tape; else, to move toward the edge. The servo controller senses a dual servo sensor to detect any two of the defined servo bands; and, upon sensing any two of the defined servo bands, detects the longitudinal shift to identify which ones of the two defined servo bands have been detected.

公开(公告)号：AU6930301A

公开(公告)日：2002-02-25

申请号：AU6930301

申请日：2001-07-06

Applicant: IBM

Inventor： KOSKI JOHN ALEXANDER ,  SASAKI AKIMITSU ,  TSURUTA KAZUHIRO

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

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.