CA2413132A1 - Method and position control for a servo system for positioning a head laterally with respect to defined servo tracks - Google Patents

Method and position control for a servo system for positioning a head laterally with respect to defined servo tracks Download PDF

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Publication number
CA2413132A1
CA2413132A1 CA002413132A CA2413132A CA2413132A1 CA 2413132 A1 CA2413132 A1 CA 2413132A1 CA 002413132 A CA002413132 A CA 002413132A CA 2413132 A CA2413132 A CA 2413132A CA 2413132 A1 CA2413132 A1 CA 2413132A1
Authority
CA
Canada
Prior art keywords
servo
actuator portion
position control
respect
positioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002413132A
Other languages
French (fr)
Other versions
CA2413132C (en
Inventor
Nhan Xuan Bui
John Alexander Koski
Akimitsu Sasaki
Kazuhiro Tsuruta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2413132A1 publication Critical patent/CA2413132A1/en
Application granted granted Critical
Publication of CA2413132C publication Critical patent/CA2413132C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/584Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00Head arrangements not specific to the method of recording or reproducing
    • G11B21/02Driving or moving of heads
    • G11B21/08Track changing or selecting during transducing operation
    • G11B21/081Access to indexed tracks or parts of continuous track
    • G11B21/086Access to indexed tracks or parts of continuous track on tapes
    • G11B21/088Access to indexed tracks or parts of continuous track on tapes with track following of accessed part
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00Head arrangements not specific to the method of recording or reproducing
    • G11B21/02Driving or moving of heads
    • G11B21/10Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G11B21/103Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on tapes
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55Track change, selection or acquisition by displacement of the head
    • G11B5/5504Track change, selection or acquisition by displacement of the head across tape tracks
    • G11B5/5508Control circuits therefor

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).
CA002413132A 2000-08-16 2001-07-06 Method and position control for a servo system for positioning a head laterally with respect to defined servo tracks Expired - Lifetime CA2413132C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/641,135 2000-08-16
US09/641,135 US6721126B1 (en) 2000-08-16 2000-08-16 Position identification for a coarse actuator portion of a compound actuator
PCT/GB2001/003063 WO2002015173A1 (en) 2000-08-16 2001-07-06 Method and position control for a servo system for positioning a head laterally with respect to defined servo tracks

Publications (2)

Publication Number Publication Date
CA2413132A1 true CA2413132A1 (en) 2002-02-21
CA2413132C CA2413132C (en) 2006-09-19

Family

ID=24571082

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002413132A Expired - Lifetime CA2413132C (en) 2000-08-16 2001-07-06 Method and position control for a servo system for positioning a head laterally with respect to defined servo tracks

Country Status (11)

Country Link
US (1) US6721126B1 (en)
EP (1) EP1309967B1 (en)
JP (1) JP4068959B2 (en)
KR (1) KR100523704B1 (en)
CN (1) CN1207701C (en)
AT (1) ATE275752T1 (en)
AU (1) AU2001269303A1 (en)
CA (1) CA2413132C (en)
DE (1) DE60105436T2 (en)
MY (1) MY134153A (en)
WO (1) WO2002015173A1 (en)

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US7773340B2 (en) * 1999-02-23 2010-08-10 Advanced Research Corporation Patterned magnetic recording head having a gap pattern with substantially elliptical or substantially diamond-shaped termination pattern
US6496328B1 (en) * 1999-12-30 2002-12-17 Advanced Research Corporation Low inductance, ferrite sub-gap substrate structure for surface film magnetic recording heads
US7038877B2 (en) * 2003-03-12 2006-05-02 Matsushita Electric Idustrial Co., Ltd. Head positioning apparatus
US7106544B2 (en) * 2003-05-09 2006-09-12 Advanced Research Corporation Servo systems, servo heads, servo patterns for data storage especially for reading, writing, and recording in magnetic recording tape
US7142381B2 (en) * 2003-11-10 2006-11-28 Imation Corp. Servo writing devices for creating servo patterns with inherent track ID
US7038872B2 (en) * 2003-11-10 2006-05-02 Imation Corp. Servo patterns with inherent track ID
US7038871B2 (en) * 2003-11-10 2006-05-02 Imation Corp. Multi-band servo patterns with inherent track ID
US7133261B2 (en) * 2003-12-17 2006-11-07 International Business Machines Corporation Tape head having a support plate with contoured surface
US8144424B2 (en) 2003-12-19 2012-03-27 Dugas Matthew P Timing-based servo verify head and magnetic media made therewith
US7283317B2 (en) * 2004-01-30 2007-10-16 Advanced Research Corporation Apparatuses and methods for pre-erasing during manufacture of magnetic tape
US20100321824A1 (en) * 2004-02-18 2010-12-23 Dugas Matthew P Magnetic recording head having secondary sub-gaps
US7450341B2 (en) * 2004-05-04 2008-11-11 Advanced Research Corporation Intergrated thin film subgap subpole structure for arbitrary gap pattern magnetic recording heads and method of making the same
US7158338B2 (en) * 2004-05-24 2007-01-02 Quantum Corporation Servo track having periodic frames of tone field and embedded synchronization marks
US7362525B2 (en) * 2005-07-22 2008-04-22 Quantum Corporation PRML based magnetic servo position demodulator
US7307809B2 (en) * 2005-08-18 2007-12-11 Quantum Corporation Correlation servo for positioning recording head
US7428118B2 (en) * 2005-11-28 2008-09-23 Quantum Corporation LTM compensation methods and systems for magnetic servo writing
WO2009094516A1 (en) * 2008-01-23 2009-07-30 Advanced Research Corporation Recording heads with embedded tape guides and magnetic media made by such recording heads
US8068300B2 (en) * 2008-03-28 2011-11-29 Advanced Research Corporation Thin film planar arbitrary gap pattern magnetic head
WO2011014836A2 (en) * 2009-07-31 2011-02-03 Advanced Research Corporation Erase drive systems and methods of erasure for tape data cartridge
US8027121B2 (en) * 2009-11-04 2011-09-27 International Business Machines Corporation Positioning coarse servo actuator of tape servo system to allow fine servo actuator to follow tape shift excursions
US8059362B2 (en) * 2010-03-02 2011-11-15 International Business Machines Corporation Positioning a coarse actuator of compound actuator tape servo system at midpoint of maximum peaks of lateral tape movement

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US5121270A (en) 1989-09-19 1992-06-09 Alcudia Ezra R Multitransducer head positioning servo for use in a bi-directional magnetic tape system
US5726824A (en) 1991-12-10 1998-03-10 Exabyte Corporation Head positioning in a multi-track magnetic tape recorder/player
EP0565918B1 (en) 1992-04-13 1998-05-20 Imation Corp. Head positioning mechanism for multitrack tape recorder
US5949604A (en) 1992-06-24 1999-09-07 Quantum Corporation Method of writing and reading servo on tracks having a longitudinal gap
US5689384A (en) 1994-06-30 1997-11-18 International Business Machines Corporation Timing based servo system for magnetic tape systems
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Also Published As

Publication number Publication date
CN1447964A (en) 2003-10-08
EP1309967A1 (en) 2003-05-14
EP1309967B1 (en) 2004-09-08
US6721126B1 (en) 2004-04-13
KR100523704B1 (en) 2005-10-26
DE60105436T2 (en) 2005-10-06
ATE275752T1 (en) 2004-09-15
DE60105436D1 (en) 2004-10-14
AU2001269303A1 (en) 2002-02-25
JP4068959B2 (en) 2008-03-26
WO2002015173A1 (en) 2002-02-21
MY134153A (en) 2007-11-30
KR20030024848A (en) 2003-03-26
CN1207701C (en) 2005-06-22
CA2413132C (en) 2006-09-19
JP2004507014A (en) 2004-03-04

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Effective date: 20210706

MKEX Expiry

Effective date: 20210706