Patent US4903151A successfully refreshed from Google Patents.
US4903151A
Expired / Lapsed
US
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Head positioning system for positioning a multiple head with respect to data and servo trasks of a recording medium
Assignee: NTT Inc
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Filing: 1987-01-22
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Granted: 1990-02-20
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Expires: 2007-01-22
Abstract
Abstract A head positioning system on a recording medium includes a recording medium having a periodic arrangement of data tracks and servo tracks wherein the periodic arrangement having a predetermined period includes N d (N d is an integer equal to or larger than 1) number of data tracks and N s (N s is an integer equal to or larger than 2) number of servo tracks, the servo tracks having single phase servo patterns, alternatively recorded thereon, a multi-head carrying a plurality of head elements disposed in a direction perpendicular to the tracks, so that the distance between head elements is (N h +1/M)P where N h is an integer equal to or larger than O, M is an integer equal to or larger than 2, and P is a track pitch, wherein the multi-head is movable in a direction generally perpendicular to the direction of the tracks, means for selecting a servo head for reading servo tracks and a data head for reading data tracks from the head elements during a seek operation, wherein a selected servo head is selected to reproduce a servo pattern from a servo track and a selected data head is determined based on the selected servo head, and wherein the multi-head is positioned on a servo track in every 1/M track pitch of movement.
Inventors
- 👤 Makoto Mizukami
- 👤 Akio Mitamura
- 👤 Ryoichi Arai
- 👤 Yasunaga Mitsuya
- 👤 Tetsuo Mikazuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:44
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B5/488; G11B5/4886; G11B5/5552; G11B5/5556; G11B7/00; G11B7/08; G11B7/085; G11B7/08505
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
220 words
A head positioning system on a recording medium comprising: (a) a recording medium having a periodic arrangement of data tracks and servo tracks wherein the periodic arrangement having a predetermined period includes N d (N d is an integer equal to or larger than (1) number of data tracks and N s (N s is an integer equal to or larger than (2) number of servo tracks, said servo tracks having single phase servo patterns, alternately recorded thereon; (b) a multi-head carrying a plurality of head elements disposed in a direction perpendicular to the tracks, so that the distance between head elements is (N h +1/M)P where N h is an integer equal to or larger than 0, M is an integer equal to or larger than 2, and P is a track pitch, said multi-head being movable in a direction generally perpendicular to the tracks; (c) means for selecting a servo head for reading servo tracks and a data head for reading data tracks from said head elements during a seek operation, wherein a selected servo head is selected to reproduce a servo pattern from a servo track and a selected data head is determined according to the selected servo head; and (d) wherein the multi-head is positioned on a servo track in every 1/M track pitch of movement.
Claim 2
Dependent Claim
220 words
A head positioning system on a recording medium comprising: (a) a recording medium having a periodic arrangement of data tracks and servo tracks wherein the periodic arrangement having a predetermined period includes N d (N d is an integer equal to or larger than (1) number of data tracks and N s (N s is an integer equal to or larger than (2) number of servo tracks, said servo tracks having single phase servo patterns, alternately recorded thereon; (b) a multi-head carrying a plurality of head elements disposed in a direction perpendicular to the tracks, so that the distance between head elements is (N h +1/M)P where N h is an integer equal to or larger than 0, M is an integer equal to or larger than 2, and P is a track pitch, said multi-head being movable in a direction generally perpendicular to the tracks; (c) means for selecting a servo head for reading servo tracks and a data head for reading data tracks from said head elements during a seek operation, wherein a selected servo head is selected to reproduce a servo pattern from a servo track and a selected data head is determined according to the selected servo head; and (d) wherein the multi-head is positioned on a servo track in every 1/M track pitch of movement.
Claim 3
Dependent Claim
49 words
A head positioning system according to claim 1, wherein: two adjacent data tracks have an opposite azimuth from each other; servo tracks in adjacent periods of the periodic arrangement having opposite azimuths with respect to one another; and each head element on the multi-head has alternately an opposite azimuth.
Claim 4
Dependent Claim
39 words
A head positioning system according to claim 1 further comprising means for determining a direction of movement of the head such that the moving distance of the head is the shortest when an object track is under the multi-head.
Claim 5
Dependent Claim
258 words
A head positioning system on a recording medium comprising: (a) a recording medium having periodic arrangement of data and servo track groups with a predetermined pitch period between tracks wherein a data track group had N d (N d is an integer equal to or larger than (1) number of data tracks, and a servo group has N s (N s is an integer equal to or larger than (2) number of servo tracks, each servo track having the same width and an M-phase servo pattern (M is an integer equal to or larger than 2), said data and servo track groups being disposed alternately on the recording medium; (b) a multi-head carrying a plurality of head elements equally spaced from one another and disposed in a direction perpendicular to the tracks, so that the distance between individual head elements is N h P where N h is an integer equal to or larger than 1 and P is a track pitch, and said multi-head is movable in a direction generally perpendicular to the direction of the tracks; (c) means for selecting a servo head for reading M-phase servo pattern on a servo track and a data head for reading a data track from among said head elements during a seek operation wherein a selected head is selected to reproduce a servo pattern on a servo track and a selected data head is determined according to the selected servo head; and (d) wherein the multi-head is positioned on a servo track in every 1/M track pitch of movement.
Claim 6
Dependent Claim
258 words
A head positioning system on a recording medium comprising: (a) a recording medium having periodic arrangement of data and servo track groups with a predetermined pitch period between tracks wherein a data track group had N d (N d is an integer equal to or larger than (1) number of data tracks, and a servo group has N s (N s is an integer equal to or larger than (2) number of servo tracks, each servo track having the same width and an M-phase servo pattern (M is an integer equal to or larger than 2), said data and servo track groups being disposed alternately on the recording medium; (b) a multi-head carrying a plurality of head elements equally spaced from one another and disposed in a direction perpendicular to the tracks, so that the distance between individual head elements is N h P where N h is an integer equal to or larger than 1 and P is a track pitch, and said multi-head is movable in a direction generally perpendicular to the direction of the tracks; (c) means for selecting a servo head for reading M-phase servo pattern on a servo track and a data head for reading a data track from among said head elements during a seek operation wherein a selected head is selected to reproduce a servo pattern on a servo track and a selected data head is determined according to the selected servo head; and (d) wherein the multi-head is positioned on a servo track in every 1/M track pitch of movement.
Claim 7
Dependent Claim
38 words
A head positioning system according to claim 4, further comprising means for determining a moving direction of the head such that the moving distance of the head is the shortest when an object track is under the multi-head.
References Cited (Backward Citations)
US3263031A
Cited
US3292168A
Cited
US3769465A
Cited
US4152736A
Cited
US4149198A
Cited
JPS54135520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |