Disc drive electromagnetic actuator with enhanced flux density

Details Disc drive electromagnetic actuator with enhanced flux density Disc drive electromagnetic actuator with enhanced flux density

1982-05-19

1984-07-24

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360105, 310 12, G11B 554, G11B 2108

Patent

active

044620543

ABSTRACT:
An electromagnetic actuator for a data disc drive having a carriage on which is mounted one or more read/write heads for cooperation with a data disc. The carriage is supported in the housing for movement on an axis that is oriented radially of the disc. The end of the carriage remote from the read/write head is of hollow rectangular cross-sectional shape; there is a voice coil mounted on the end of the carriage. A magnetic housing defines a cavity in alignment with the carriage and the coil so that the carriage and coil can move within the cavity. The housing is constructed of magnetic material, and in magnetic circuit with the housing is at least one permanent magnet. The permanent magnet has a surface that confronts the path along which the coil moves. Between the permanent magnet surface and the coil is a flux focussing pole piece of generally trapezoidal shape so that the flux density at the inner surface of the pole piece that confronts the path of coil movement is greater than the flux density at the inner surface of the permanent magnet. Consequently, for a given current flow within the coil, a great force is applied to the carriage so that faster radial movement of the carriage and the read/write head can be achieved.

REFERENCES:
patent: 4006372 (1977-02-01), Brown, Jr. et al.
patent: 4305105 (1981-12-01), Ho et al.
patent: 4331991 (1982-05-01), Morehouse et al.
patent: 4393425 (1983-07-01), Wright
IBM/TDB, vol. 12, No. 12, May 1970, p. 2273, "High Force Constant Voice Coil Motor for Rapid Seek" by Rexford.

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