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EP0097768A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A servo positioning system for a magnetic disc

Assignee: International Business Machines Corp
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Filing: 1983-03-15
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Granted: —
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Expires: 2003-03-15
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Abstract

Abstract This invention relates to a system for use in track following servo operations on a magnetic disk where sectors of servo information are interspersed on said disk with data track portions. The servo information and data are read by the same magnetic head. The servo sectors contains alternate first and second servo tracks having magnetic transitions which are spaced from each other in adjacent tracks. The servo tracks are recorded on said disk at a slant with respect to said data tracks. The centerline of each of said servo tracks corresponds to the centerline of one of said data tracks at the beginning of each servo motor and the centerline of each of said slanted servo tracks corresponding to the centerline of a different one of said data tracks at the end of each servo sector. The system includes first detector means (22) for detecting signals read by said head as it passes across said servo sector, and digital means (23, 24) for measuring time relationships between signals from said first and second servo tracks during the rotation of said servo sector past said head to provide a measure of the amount and direction of the displacement of said head from said data track centerline.

Inventors

  • 👤 Dale Howard Pennington

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 20:46
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59633

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 206 words
A system for use in track following servo operations on a magnetic disk where sectors of servo information are interspersed on said disk with data track portions, said servo information and said data being read by the same magnetic head, characterised in that said servo sectors contain alternate first and second servo tracks having magnetic transitions which are spaced from each other in adjacent tracks, said servo tracks being recorded on said disk at a slant with respect to said data tracks, the centreline of each of said servo tracks corresponding to the centreline of one of said data tracks at the beginning of each servo sector, and the centreline of each of said slanted servo tracks corresponding to the centreline of a different one of said data tracks at the end of each servo sector, and said system includes first detector means (22) for detecting signals read by said head as it passes across said servo sector, and digital means (23, 24) for measuring time relationships between signals from said first and second servo tracks during the rotation of said servo sector past said head to provide a measure of the amount and direction of the displacement of said head from said data track centreline.
Claim 2
Independent Claim 206 words
A system for use in track following servo operations on a magnetic disk where sectors of servo information are interspersed on said disk with data track portions, said servo information and said data being read by the same magnetic head, characterised in that said servo sectors contain alternate first and second servo tracks having magnetic transitions which are spaced from each other in adjacent tracks, said servo tracks being recorded on said disk at a slant with respect to said data tracks, the centreline of each of said servo tracks corresponding to the centreline of one of said data tracks at the beginning of each servo sector, and the centreline of each of said slanted servo tracks corresponding to the centreline of a different one of said data tracks at the end of each servo sector, and said system includes first detector means (22) for detecting signals read by said head as it passes across said servo sector, and digital means (23, 24) for measuring time relationships between signals from said first and second servo tracks during the rotation of said servo sector past said head to provide a measure of the amount and direction of the displacement of said head from said data track centreline.
Claim 3
Dependent Claim 33 words
A system as claimed in claim 1, including second detector means connected to said first detector mcans for detecting which of said first and second tracks said detected signal has been reproduced from.
Claim 4
Dependent Claim 18 words
A system as claimed in claim 1 or 2, in which said digital means includes a bidirectional counter.
Claim 5
Dependent Claim 84 words
A system as claimed in claim 3, in which the bidirectional counter counts in one direction when only pulses from one of said first or second servo tracks is encountered, said counter reversing direction when pulses from both said first and second servo tracks are encountered, and said counter stopping at the end of said servo sector, the count residing in said counter after stopping being a measure of the amount and direction of the displacement of said head from said data track centreline.

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