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US4631606A
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System for detecting the position of a read-write head on a disk recording medium having servo sectors with three or more servo patterns
Assignee: Toshiba Corp
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Filing: 1984-03-05
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Granted: 1986-12-23
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Expires: 2004-03-05
Abstract
Abstract In order to perform a high-speed seek of a target track while the increase of area of servo sectors is minimized, each servo sector of a disk recording medium has K (an integer of 3 or more) servo patterns. The K servo patterns consist of a first servo pattern consisting of two-phase first and second pairs of alternate pattern arrays having a period of four tracks; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2 K+1 tracks and displaced by 2 K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2 K-k+3 (k includes all integers of not less than 3 and not more than K) tracks and displaced by 2 K-k+1 tracks with respect to a (k-1)th servo pattern. K is set to 3 for a head speed of 16 tracks/sector. In this case, three servo patterns consisting of seven pattern arrays are provided. Similarly, K is set to 4 for a head speed of 32 tracks/sector. In this case, four servo patterns consisting of eight pattern arrays are provided. With such a configuration of servo patterns, the number of signal detectors for detecting servo signals corresponding to the servo pattern arrays, which are provided in a servo tracking apparatus, can be minimized.
Inventors
- 👤 Toshihiro Sugaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:34
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/10; G11B21/08; G11B21/081; G11B21/083; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
189 words
A disk recording medium having a plurality of data sectors each having concentric data tracks and servo sectors each having concentric servo tracks and embedded between adjacent data sectors, characterized in that each servo sector has K (an integer of not less than 3) servo information patterns which consist of a first servo pattern consisting of a first pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, and a second pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, said first and second pairs of alternate pattern arrays being displaced by one track with respect to each other; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2 K+1 tracks and displaced by 2 K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2 K-k+3 (k includes all intergers of not less than 3 and not more than K) tracks and displaced by 2 K-k+1 tracks with respect to a (k-1)th servo pattern.
Claim 2
Dependent Claim
189 words
A disk recording medium having a plurality of data sectors each having concentric data tracks and servo sectors each having concentric servo tracks and embedded between adjacent data sectors, characterized in that each servo sector has K (an integer of not less than 3) servo information patterns which consist of a first servo pattern consisting of a first pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, and a second pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, said first and second pairs of alternate pattern arrays being displaced by one track with respect to each other; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2 K+1 tracks and displaced by 2 K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2 K-k+3 (k includes all intergers of not less than 3 and not more than K) tracks and displaced by 2 K-k+1 tracks with respect to a (k-1)th servo pattern.
Claim 3
Dependent Claim
10 words
A medium according to claim 1, wherein K is 3.
Claim 4
Dependent Claim
10 words
A medium according to claim 1, wherein K is 4.
Claim 5
Dependent Claim
28 words
A medium according to claim 1, wherein said pair of alternate pattern arrays of said second servo pattern are formed at one side of said first servo pattern.
Claim 6
Dependent Claim
27 words
A medium, according to claim 1, wherein K is 3, and said second and third servo patterns are formed at opposite sides of said first servo pattern.
Claim 7
Dependent Claim
17 words
A medium, according to claim 1, wherein each of said servo patterns consists of a dibit pattern.
Claim 8
Dependent Claim
273 words
A tracking servo system for positioning a read-write head on a target track of a disk recording medium having a plurality of data sectors each having concentric data tracks and servo sectors each having concentric servo tracks and embedded between adjacent data sectors, each servo sector having K (an integer of not less than 3) servo patterns which consist of a first servo pattern consisting of a first pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, and a second pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, said first and second pairs of alternate pattern arrays being displaced by one track with respect to each other; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2 K+1 tracks and displaced by 2 K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period 2 K-k+3 (k includes all intergers of not less than 3 and not more than K) tracks and displaced by 2 K-k+1 tracks with respect to a (k-1)th servo pattern, comprising: head driving means for driving said read-write head in the radial direction of said disk recording medium; detecting means for detecting servo signals, corresponding to said pattern arrays of said servo patterns from an output signal of said read-write head obtained at each of said servo sectors; and controlling means responsive to the servo signals from said detecting means for controlling said head driving means to position said read-write head on the target track.
Claim 9
Dependent Claim
273 words
A tracking servo system for positioning a read-write head on a target track of a disk recording medium having a plurality of data sectors each having concentric data tracks and servo sectors each having concentric servo tracks and embedded between adjacent data sectors, each servo sector having K (an integer of not less than 3) servo patterns which consist of a first servo pattern consisting of a first pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, and a second pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, said first and second pairs of alternate pattern arrays being displaced by one track with respect to each other; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2 K+1 tracks and displaced by 2 K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period 2 K-k+3 (k includes all intergers of not less than 3 and not more than K) tracks and displaced by 2 K-k+1 tracks with respect to a (k-1)th servo pattern, comprising: head driving means for driving said read-write head in the radial direction of said disk recording medium; detecting means for detecting servo signals, corresponding to said pattern arrays of said servo patterns from an output signal of said read-write head obtained at each of said servo sectors; and controlling means responsive to the servo signals from said detecting means for controlling said head driving means to position said read-write head on the target track.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |