Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1985-02-27
1988-03-29
Hecker, Stuart N.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360105, 360106, G11B 554, G11B 555
Patent
active
047348046
ABSTRACT:
A damped magnetic head driver for a stepping motor driver. A damper is attached to a shaft of the stepping motor. A lightweight sealed housing of the damper is rigidly attached to the shaft and contains a hollow portion. A heavy flywheel is fitted in the hollow and is supported on the shaft by ball bearings. A viscous fluid fills the remainder of the hollow. In a further improvement, a circumferential surface of the damper housing has a series of teeth that are engaged by a plunger when power to the disc drive is interrupted.
REFERENCES:
patent: 3286109 (1966-11-01), Madsen
patent: 3389277 (1968-06-01), Fiore
patent: 4161004 (1979-07-01), Dalziel
patent: 4164769 (1979-08-01), Kaseta et al.
patent: 4194226 (1980-03-01), Kaseta etal.
patent: 4234899 (1980-11-01), Feldstein et al.
patent: 4308564 (1981-12-01), Thompson
Bowler Alyssa H.
Hecker Stuart N.
NEC Corporation
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