Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1975-03-31
1976-11-23
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, 360 98, G11B 556, G11B 218, G11B 2110
Patent
active
039940160
ABSTRACT:
A closed loop head positioning servo system is disclosed for use in a disk drive employing a disk pack having a dedicated servo surface and a number of data surfaces carrying both data and servo information. A track counting coarse positioning system is used to move the heads in a ganged assembly to the vicinity of a desired cylinder. A fine positioning system includes one error circuit for generating an error signal representing the deviation of a servo head from a desired cylinder on the dedicated servo surface. Another error circuit generates a second error signal representing the offset of a selected data head from a selected data track in the same cylinder. Analog circuits combine the error signals to produce an output signal which, when applied to an actuator, centers the selected data head on the selected track.
REFERENCES:
patent: 3246307 (1966-04-01), Stanley
patent: 3474432 (1969-10-01), Sevilla
patent: 3479664 (1969-11-01), Stuart-Williams et al.
patent: 3699555 (1972-10-01), Du Vall
patent: 3737883 (1973-06-01), Sordello
patent: 3789378 (1974-01-01), Bonzano et al.
Eddleman Alfred H.
Honeywell Information Systems Inc.
Reiling Ronald T.
White William F.
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