Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-02-21
1994-08-02
Robertson, David L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7707, G11B 5596
Patent
active
053351231
ABSTRACT:
In a rotatable recording medium, three servo-patterns are discretely formed in the circular direction. A first servo-pattern is made of at least three-phase dibit patterns each having a period of 3 tracks; a second servo-pattern is made of two-phase dibit patterns having a period of 12 tracks and a shift of 3 tracks from each other; and a third servo-pattern is made of a dibit pattern having a period of 6 tracks and a shift of at least 1.5 tracks from the second servo-pattern. Based on reproduction signals derived from the three servo-patterns on the recording medium, relative position of a head against the recording medium is recognized with a precision up to (1/2.sup.N) of a track width using only a binary-valued process.
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Shimizu Ryosuke
Wakabayashi Noriaki
Matsushita Electric - Industrial Co., Ltd.
Robertson David L.
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