Linear actuator for magnetic disc drive and the like

Details Linear actuator for magnetic disc drive and the like Linear actuator for magnetic disc drive and the like

1980-06-16

1981-12-08

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

310 12, G11B 555, G11B 2108

Patent

active

043051057

ABSTRACT:
A linear actuator for a magnetic disc drive has shortened magnetic flux lines totally confined within the actuator housing whereby the actuator can be placed in closer proximity to a disc and thus reduce the size of the disc drive package. The actuator includes a generally cylindrical housing with magnets attached to the inside surface of the housing. A cylindrical bobbin having a voice coil wound on its periphery is positioned within the housing and linearly movable therein with the voice coil in close proximity to the magnets. An annular magnetic flux transmission means is attached to one face of the housing and a flux transmission plate is attached to the opposite face of the housing with the flux transmission means providing magnetic flux paths and preventing flux leakage from the housing.

REFERENCES:
patent: 3886595 (1975-05-01), Swaim et al.
Giebeau et al., Linear Actuator, IBM Tech. Disc. Bull., vol. 13, No. 1, Jun. 1970, p. 63.

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