Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-07-18
1995-03-28
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7804, G11B 5596
Patent
active
054022878
ABSTRACT:
In the head positioning apparatus of a disk-shaped information recording medium using the sector-servo-method, track codes are recorded in advance so as to be repeated every 12 tracks in the servo sectors of the disk-shaped information recording medium, the track are reproduced with a head, and a distance between the current position of the head and a target track is detected from the reproduced signal of the track codes with a resolution of 1/2.sup.7 of track width, then the head is moved to the target track so as to decrease the distance, when the head reaches the range of the width of .+-.6 tracks of the target track, an expanded head position signal having the resolution of 1/2.sup.7 is generated, and the head is controlled on the basis of the expanded head position signal and is finally settled to the target track.
REFERENCES:
patent: 4032984 (1977-06-01), Kaser et al.
patent: 4530019 (1985-04-01), Penniman
patent: 4631606 (1986-12-01), Sugaya
patent: 5021898 (1991-06-01), Sakai et al.
patent: 5170299 (1992-12-01), Moon
Shimizu Ryosuke
Takaoka Tetsurou
Wakabayashi Noriaki
Yoshiura Tsukasa
Matsushita Electric - Industrial Co., Ltd.
Psitos Aristotelis
Wilson James T.
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