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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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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：MY117516A
公开(公告)日：2004-07-31
申请号：MYPI20001979
申请日：2000-05-08
Applicant: IBM
Inventor： BUI NHAN XUAN , FUKUDA JUNICHI , JAQUETTE GLEN ALAN , KOSKI JOHN ALEXANDER , TSURUTA KAZUHIRO
Abstract: DISCLOHSED ARE A METHOD AND A DETECTOR FOR ADAPTIVELY DETECTING SERVO GAPS IN A TIMING BASED SERVO PATTERN PRERECORDED ON A VARIABLE MEDIA.THE TIMING BASED SERVO PATTERN HAS GROUPS OF REPEATED PAIRS OF NON-PARALLEL TRANSITION STRIPES ARRANGED IN BURST, THE BURST SEPARATES BY SERVO GAPS WHOSE LENGTH IS VARIABLE. ASERVO SYSTEM SENSOR SENSE THE TRANSITION STRIPES IN THE LONGITUDINAL DIRECTION OF THE MEDIA. AGROUP INTERVAL DETECTOR COUPLED TO THE SENSOR DETECTS THE TIMING INTERVAL BETWEEN THE SAME SLOPE TRANSITION STRIPES OF TWO SEQUENTIAL GROUPS OF BURST. A DIVIDER DIVIDES THE DETECTED GROUP TIMING INTERVAL BY A PREDETERMINED DIVISOR TO PROVIDE A DIVIDED TIMING INTERVAL GAP DETECTION THRESHOLD .A SEQUENTIAL STRIP INTERVAL DETECTOR COUPLED TO THE SENSOR MEASURES THE TIMING INTERVAL BETWEEN STRIPES, AND A COMPARATOR COMPARES THE DIVIDED TIMING INTERVAL AND THE TIMING INTERVAL, IDENTIFYING A SERVO GAP UPON THE MEASURED TIMING INTERVAL AT LEAST EQUALING THE GAP THRESHOLD. THE DETECTOR RESPONDS TO "VALID" SIGNALS WHICH INDICATE THE VALIDITY OF THE DETECTED GROUP TIMING INTERVAL, REPEATION OPERATION OF THE DIVIDER TO UPDATE THE GAP THRESHOLD , REPEATING OPERATION OF THE COMPARATOR WITH THE UPDATED GAP THRESHOLD TO CONTINUE TO IDENTIFY THE SERVO GAPS.
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公开(公告)号：HU0201447A2
公开(公告)日：2002-08-28
申请号：HU0201447
申请日：2000-05-18
Applicant: IBM
Inventor： BUI NHAN XUAN , JAQUETTE GLEN ALAN , KOSKI JOHN ALEXANDER , TSURUTA KAZUHIRO
Abstract: A system and method for precisely registering and synchronizing data sets on a recording media having a prerecorded servo pattern. The recording media is subject to continuing movement for reading and/or writing the data sets, interrupted by stopping at the end of a selected data set and restarting. During the continuing movement of the recording media, a detector coupled to the servo system continuously reads linear position registration data modulated into the prerecorded servo pattern. An interpolator interpolates the prerecorded registration data to provide precision registration information for the data sets. Upon the drive stopping the recording media, then back hitching the media and the movement restarting, selected read and interpolated registration information is provided. The detector again reads and interpolates the prerecorded registration data, and a comparator compares the again read and interpolated registration information to the provided read and interpolated registration information and any predetermined offset, and indicates a comparison match. A data formatter coupled to the comparator, responsive to the comparison match indication, synchronizes the reading and/or writing of data sets on the recording media.
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Patent Agency Ranking
公开(公告)号：GB2490219B
公开(公告)日：2014-07-16
申请号：GB201206620
申请日：2011-01-20
Applicant: IBM
Inventor： HANCOCK REED ALAN , BUI NHAN XUAN , TSURUTA KAZUHIRO , JUDD KEVIN BRUCE , INCH RANDY CLARK
IPC: G11B5/584
Abstract: A servo detection system for detecting servo tracks of a longitudinal tape. In a read/write head, two servo read heads are spaced laterally on a first head module, and a servo read head is on a second head module spaced longitudinally from the first module. A method comprises initially sensing a tape servo track with one servo read head of the first module and the servo read head of the second module to determine skew misalignment of the servo track. A zero reference value is stored representing the determined skew misalignment. The detection system switches from the one servo read head of each module, to the two servo read heads of the first module, and employs the stored value to position the read/write head in the zero skew position. The two servo read heads are then employed to read two servo tracks to identify the data band and to control skew.
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公开(公告)号：DE112011102447T5
公开(公告)日：2013-06-13
申请号：DE112011102447
申请日：2011-07-14
Applicant: IBM
Inventor： HANCOCK REED ALAN , INCH RANDY CLARK , TSURUTA KAZUHIRO , OGURA EIJI , NADE-HARA SHUHEI , BUI NHAN XUAN
Abstract: Offenbart wird ein Verfahren zum Betrieb eines Magnetbandlaufwerks. Das Bandlaufwerk weist eine Vielzahl von Gleichstrommotoren auf, von denen jeder eine Vielzahl von Hall-Sensoren aufweist und unter der Steuerung eines Servosystems steht, das so konfiguriert ist, dass es Positionsangaben vom Magnetband liest. Das Servosystem berechnet eine primäre Bandgeschwindigkeit aus der Positionsangabe und erfasst ein sekundäres und ein tertiäres Geschwindigkeitssignal und berechnet anhand dieser eine Bandgeschwindigkeit. Wenn die Positionsangabe der primären Geschwindigkeit verfügbar ist, wird sie verwendet, wenn nicht, wird eines von dem sekundären oder tertiären Geschwindigkeitssignal verwendet. Das sekundäre Geschwindigkeitssignal wird verwendet, wenn ein Absolutwert eines auf die Bandgeschwindigkeit bezogenen Terms kleiner als ein vorbestimmter Wert ist, und das tertiäre Geschwindigkeitssignal wird verwendet, wenn ein Absolutwert des auf die Bandgeschwindigkeit bezogenen Terms größer als der vorbestimmte Wert ist.
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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：DE60004043T2
公开(公告)日：2004-04-15
申请号：DE60004043
申请日：2000-05-18
Applicant: IBM
Inventor： BUI XUAN , JAQUETTE ALAN , KOSKI ALEXANDER , TSURUTA KAZUHIRO
IPC: G11B27/28 , G11B27/10 , G11B27/32 , G11B27/36 , G11B15/087
Abstract: A system and method for precisely registering and synchronizing data sets on a recording media having a prerecorded servo pattern. The recording media is subject to continuing movement for reading and/or writing the data sets, interrupted by stopping at the end of a selected data set and restarting. During the continuing movement of the recording media, a detector coupled to the servo system continuously reads linear position registration data modulated into the prerecorded servo pattern. An interpolator interpolates the prerecorded registration data to provide precision registration information for the data sets. Upon the drive stopping the recording media, then back hitching the media and the movement restarting, selected read and interpolated registration information is provided. The detector again reads and interpolates the prerecorded registration data, and a comparator compares the again read and interpolated registration information to the provided read and interpolated registration information and any predetermined offset, and indicates a comparison match. A data formatter coupled to the comparator, responsive to the comparison match indication, synchronizes the reading and/or writing of data sets on the recording media.
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公开(公告)号：DE60004043D1
公开(公告)日：2003-08-28
申请号：DE60004043
申请日：2000-05-18
Applicant: IBM
Inventor： BUI XUAN , JAQUETTE ALAN , KOSKI ALEXANDER , TSURUTA KAZUHIRO
IPC: G11B27/28 , G11B27/10 , G11B27/32 , G11B27/36 , G11B15/087
Abstract: A system and method for precisely registering and synchronizing data sets on a recording media having a prerecorded servo pattern. The recording media is subject to continuing movement for reading and/or writing the data sets, interrupted by stopping at the end of a selected data set and restarting. During the continuing movement of the recording media, a detector coupled to the servo system continuously reads linear position registration data modulated into the prerecorded servo pattern. An interpolator interpolates the prerecorded registration data to provide precision registration information for the data sets. Upon the drive stopping the recording media, then back hitching the media and the movement restarting, selected read and interpolated registration information is provided. The detector again reads and interpolates the prerecorded registration data, and a comparator compares the again read and interpolated registration information to the provided read and interpolated registration information and any predetermined offset, and indicates a comparison match. A data formatter coupled to the comparator, responsive to the comparison match indication, synchronizes the reading and/or writing of data sets on the recording media.
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