Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-01-30
1995-08-22
Callahan, Timothy P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7708, 318599, G11B 5596, G05B 1128
Patent
active
054445825
ABSTRACT:
A disk drive servo control circuit for controlling a position of a head using servo information obtained from a disk at predetermined time intervals, the servo information being converted to a digital servo control signal which is supplied to a digital to analog (D/A) converter whose output drives a head actuator for moving the head with respect to a selected track, wherein the width of the output signal of the D/A converter is controlled to have a time interval which is shorter than the predetermined time intervals at which the servo information is reproduced, to thereby reduce the minimum resolution in the track following mode without changing the maximum current to the actuator during track seeking.
REFERENCES:
patent: 3881184 (1975-04-01), Koepcke et al.
patent: 4217612 (1980-08-01), Matla et al.
patent: 4381526 (1983-04-01), McLaughlin et al.
patent: 4590527 (1986-05-01), Warner
patent: 4974109 (1990-11-01), Hoshimi et al.
patent: 5105318 (1992-04-01), Tsuneta et al.
patent: 5136439 (1992-08-01), Weispfenning et al.
Callahan Timothy P.
Phan Trong
Shaw, Jr. Philip M.
Sony Corporation
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