Rotary actuator for a direct access storage device

Details Rotary actuator for a direct access storage device Rotary actuator for a direct access storage device

1991-03-19

1993-11-30

Sikes, William L.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 7702, 360 7804, 360 7812, 360105, G11B 555, G11B 5596

Patent

active

052671100

ABSTRACT:
A rotary actuator head driver for a direct access storage device includes a transducer head moving in a radial direction across a disk surface for reading and/or writing data on a plurality of tracks for storing data. A support arm supports the transducer head relative to the disk surface. The support arm is connected to a pivot defining an axis of rotation spaced from the transducer head. A head driver positions the transducer head over one track in a track following mode or moves the transducer head from one track to another track in a seek mode. The head driver generates oppositely directed forces to produce a net torque applied to the support arm through the pivot. The oppositely directed forces have a line of action orthogonal a dominant motion of the transducer head. As a result, any parasitic force is orthogonal to the dominant motion and does not contribute to track misregistration errors. When the oppositely directed forces have an equal magnitude for force cancellation, the effect parasitic forces are eliminated. The head driver includes a pair of miniature voice coil motors or an in-the-hub motor.

REFERENCES:
patent: 4707754 (1987-11-01), Patel et al.
patent: 4812935 (1989-03-01), Sleger
patent: 4994931 (1991-02-01), Foote
patent: 5016131 (1991-05-01), Riggle et al.
patent: 5018035 (1991-05-01), Johnson
patent: 5023733 (1991-06-01), Koga et al.
patent: 5023736 (1991-06-01), Kelsic et al.

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