Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1980-10-15
1983-07-26
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 2108
Patent
active
043957420
ABSTRACT:
An initialization apparatus for a signal reproducing apparatus having a transducer scanning a plurality of record tracks on a record medium where the position of the transducer is controlled by a stepper motor having fewer steps than the number of record tracks required to be covered. A physical stop is provided the transducer near a selected "home" record track at one edge of the plurality of record tracks. A current selector supplies the phase windings of the stepper motor with a reduced amplitude current during an initialization position. This enables a transducer controller to stop the stepper through a sequence of steps under reduced current to the phase windings of the stepper until the physical stop is contacted, thus ensuring knowledge of the initialization of the transducer at the "home" record track.
REFERENCES:
patent: 3706857 (1972-12-01), Lynott
patent: 3860958 (1975-01-01), Hanson
patent: 3956766 (1976-05-01), Hanson et al.
patent: 4194226 (1980-03-01), Kaseta et al.
Alexander Cruzan
Bauer William D.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Tupper Robert S.
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