Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1996-04-05
1997-04-15
Evans, Jefferson
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 555
Patent
active
056215916
ABSTRACT:
A head-arm assembly having a pair of trapezoidal-like shaped coil bobbins for improved torque and moments of inertia in a voice coil motor (VCM) for a disk drive. The VCM includes a magnetic structure that employs three magnet polarity zones having two flux transition zones. The magnetic structure is able to employ relatively thin pole pieces without saturation or leakage. The thin pole pieces permit use of a thicker magnet in the same envelope size. The result is an increased flux density in the air gap of the VCM, giving higher torque and shorter access time. In addition to improving the torque and moments of inertia, the present invention allows use of thicker magnets (thinner pole pieces) and allows the option of using a thinner coil that is wider radially. In another version, an oval-shaped coil may be used for increased effective length when disposed within a magnetic field of a VCM.
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Oveyssi Kamran
Rahimi Alireza
Evans Jefferson
Seagate Technology Inc.
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