CA2148390A1 - Timing based servo system for magnetic tape systems - Google Patents

Timing based servo system for magnetic tape systems

Info

Publication number
CA2148390A1
CA2148390A1 CA002148390A CA2148390A CA2148390A1 CA 2148390 A1 CA2148390 A1 CA 2148390A1 CA 002148390 A CA002148390 A CA 002148390A CA 2148390 A CA2148390 A CA 2148390A CA 2148390 A1 CA2148390 A1 CA 2148390A1
Authority
CA
Canada
Prior art keywords
servo
pattern
head
tape
track
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
CA002148390A
Other languages
French (fr)
Other versions
CA2148390C (en
Inventor
Thomas Robert Albrecht
Robert Carl Barrett
James Howard Eaton
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23030359&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2148390(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2148390A1 publication Critical patent/CA2148390A1/en
Application granted granted Critical
Publication of CA2148390C publication Critical patent/CA2148390C/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
    • 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

Abstract

A track following servo system is disclosed for use with magnetic tape systems in which magnetic servo track patterns contain transitions recorded at more than on azimuthal orientation across the width of the servo track. The timing of a signal derived from reading at any point across the width of such a pattern varies continuously as the read head is moved across the servo track. The pattern is read by a servo read head whose width is small compared to the servo track pattern.
The combination of a wide servo pattern and a narrow servo read head offers excellent position sensing linearity and dynamic range. In the preferred embodiment, the servo read head is also narrow with respect to the data tracks, which provides the additional advantages of superior immunity to position sensing errors caused by defects or temporal variations in the servo read head, defects in the servo pattern on the tape, wear of the head or tape, or debris collection on the head or tape.
Position sensing with this system is achieved by deriving a ratio of two servo pattern intervals and therefore is insensitive to tape speed during reading. The servo patterns may include spacing intervals recognizable for error detection and correction purposes. Servo tracks are recorded using a patterned multiple gap servo write head whose magnetic gaps have geometries appropriate to generate the desired servo patterns. The patterned gaps of the servo write head are produced by photolithographically defined electroplating of permalloy on a ferrite ring head structure.
CA002148390A 1994-06-30 1995-05-02 Timing based servo system for magnetic tape systems Expired - Lifetime CA2148390C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/270,207 US5689384A (en) 1994-06-30 1994-06-30 Timing based servo system for magnetic tape systems
US270,207 1994-06-30

Publications (2)

Publication Number Publication Date
CA2148390A1 true CA2148390A1 (en) 1995-12-31
CA2148390C CA2148390C (en) 2004-04-27

Family

ID=23030359

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002148390A Expired - Lifetime CA2148390C (en) 1994-06-30 1995-05-02 Timing based servo system for magnetic tape systems

Country Status (10)

Country Link
US (5) US5689384A (en)
EP (1) EP0690442B1 (en)
JP (4) JP3158015B2 (en)
KR (1) KR100209832B1 (en)
CN (5) CN1320524C (en)
AT (1) ATE175802T1 (en)
CA (1) CA2148390C (en)
DE (1) DE69507210T2 (en)
SG (1) SG33347A1 (en)
TW (1) TW273619B (en)

Families Citing this family (364)

* Cited by examiner, † Cited by third party
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JP2000288229A (en) 2000-10-17
US6282051B1 (en) 2001-08-28
EP0690442B1 (en) 1999-01-13
CN1124399A (en) 1996-06-12
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EP0690442A3 (en) 1996-06-26
CN1320524C (en) 2007-06-06
JP3415555B2 (en) 2003-06-09
KR100209832B1 (en) 1999-07-15
CN1320526C (en) 2007-06-06
CN1783219A (en) 2006-06-07
JP3158015B2 (en) 2001-04-23
JP2000288228A (en) 2000-10-17
EP0690442A2 (en) 1996-01-03
CN1783224A (en) 2006-06-07
TW273619B (en) 1996-04-01
CA2148390C (en) 2004-04-27
US6462904B1 (en) 2002-10-08
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DE69507210D1 (en) 1999-02-25
DE69507210T2 (en) 1999-09-02
JP3993964B2 (en) 2007-10-17
KR960002311A (en) 1996-01-26
US6021013A (en) 2000-02-01
SG33347A1 (en) 1996-10-18
US5689384A (en) 1997-11-18
JPH0830942A (en) 1996-02-02
CN100350458C (en) 2007-11-21
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US6320719B1 (en) 2001-11-20
JP3989155B2 (en) 2007-10-10
CN1168090C (en) 2004-09-22
ATE175802T1 (en) 1999-01-15
CN1661683A (en) 2005-08-31
CN1661682A (en) 2005-08-31

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