Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1991-04-15
1993-08-03
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360107, G11B 555
Patent
active
052334937
ABSTRACT:
A rotary actuator for a magnetic disk drive includes an abutting pair of stationary arcuate permanent magnets and a thin, arcuate voice coil formed of a single winding of aluminum wire. The magnets and the voice coil are curved about a pivot axis of a rotating shaft supporting a movable head arm assembly of the rotary actuator. The voice coil, integral with the head arm assembly, pivots the head arm assembly responsive to electrical current introduced into the coil, particularly along two parallel active segments parallel to the pivot axis. The magnets are formed by a forging process which results in radial magnetic flux paths in their magnetic fields. Notches are formed in each magnet, symmetrically about longitudinal and transverse planes that bisect the magnet and spanning the radial thickness of the magnet. The notches counter-balance a gradient in the density of magnetic material from the peripheral regions to the center of each magnet, for greater consistency in motive force from interacting magnetic fields of the permanent magnet and voice coil, over the entire arcuate path traversed by the voice coil.
REFERENCES:
patent: 4896232 (1990-01-01), Sugawara
patent: 5005095 (1991-04-01), Wagner
patent: 5050026 (1991-09-01), Goss
patent: 5072321 (1991-12-01), Kanai et al.
Evans Jefferson
Levy Stuart S.
Seagate Technology Inc.
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