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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
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.
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公开(公告)号：JP2002074631A
公开(公告)日：2002-03-15
申请号：JP2000246706
申请日：2000-08-16
Applicant: IBM
Inventor： KIMURA MASATOSHI , SASAKI AKIMITSU , NAN X V
Abstract: PROBLEM TO BE SOLVED: To stabilize a servo system in a tape drive system for performing the reading/writing operation of the tape by inserting a tape cartridge into a tape drive independently of the combination of the drive and the cartridge. SOLUTION: The coefficient of a low-pass filter for the servo control of the tape drive is reset in accordance with the inserted tape cartridge for every insertion of the tape cartridge into the tape drive. To put it concretely, a servo pattern being recorded on the tape of the tape cartridge inserted to the tape drive is read out, the frequency of this read out servo pattern is analyzed, a singular point exceeding the prescribed spectral range is detected from the frequency component obtained by this frequency analysis, and then the coefficient of the low-pass filter is set so as to negate the power spectrum of this singular point.
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公开(公告)号：DE60105437T2
公开(公告)日：2005-09-22
申请号：DE60105437
申请日：2001-07-06
Applicant: IBM
Inventor： BUI XUAN , KOSKI 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.
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公开(公告)号：AU6930201A
公开(公告)日：2002-02-25
申请号：AU6930201
申请日：2001-07-06
Applicant: IBM
Inventor： 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.
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公开(公告)号：DE60105437D1
公开(公告)日：2004-10-14
申请号：DE60105437
申请日：2001-07-06
Applicant: IBM
Inventor： BUI XUAN , KOSKI 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.
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Patent Agency Ranking
公开(公告)号：DE60105436D1
公开(公告)日：2004-10-14
申请号：DE60105436
申请日：2001-07-06
Applicant: IBM
Inventor： BUI XUAN , KOSKI ALEXANDER , SASAKI AKIMITSU , TSURUTA KAZUHIRO
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.
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公开(公告)号：AT275752T
公开(公告)日：2004-09-15
申请号：AT01947657
申请日：2001-07-06
Applicant: IBM
Inventor： BUI NHAN XUAN , KOSKI JOHN ALEXANDER , SASAKI AKIMITSU , TSURUTA KAZUHIRO
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.
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公开(公告)号：DE60105436T2
公开(公告)日：2005-10-06
申请号：DE60105436
申请日：2001-07-06
Applicant: IBM
Inventor： BUI XUAN , KOSKI ALEXANDER , SASAKI AKIMITSU , TSURUTA KAZUHIRO
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.
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公开(公告)号：MY119237A
公开(公告)日：2005-04-30
申请号：MYPI20013743
申请日：2001-08-09
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 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 TOWAED 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, DETECT THE LONGITUDINAL SHIFT TO IDENTIFY WHICH ONES OF THE TWO DEFINED SERVO BANDS HAVE BEEN DETECTED. @FIG. 4
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公开(公告)号：DE10123069A1
公开(公告)日：2002-03-14
申请号：DE10123069
申请日：2001-05-11
Applicant: IBM DEUTSCHLAND
Inventor： BUI NHAN XUAN , KOSKI JOHN ALEXANDER , SASAKI AKIMITSU , TSURUTA KAZUHIRO
Abstract: The method involves detecting the integration function of a positioning error signal loop, and actuating the coarse actuator so that a fine actuator and a head unit are displaced w.r.t the detected integration function. Independent claims are also included for: (a) a further method for actuating a coarse actuator in a servo system (b) a servo system (c) a data storage system (d) a servo coarse controller
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