Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1985-04-04
1987-04-14
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
369270, G11B 1702
Patent
active
046583114
ABSTRACT:
A data transfer apparatus for use with a magnetic disk having a hub of magnetic material attached centrally thereto, with the hub having a central hole and an eccentric slot defined therein. A drive mechanism for imparting rotation to the magnetic disk includes a turntable having a spindle projecting therefrom for centering engagement in the central hole in the hub of the magnetic disk placed thereon, and a drive pin mounted eccentrically on the turntable for driving engagement in the eccentric slot in the disk hub. Also mounted on the turntable is a permanent magnet of approximately annular shape for attracting the disk hub. The magnet has both north and south poles on its surface opposite the hub of the magnetic disk on the turntable, so that a closed magnetic circuit is formed for the reduction of leakage flux that might adversely affect the data transfer of the apparatus with the magnetic disk. Instead of the single magnet, there can be provided two concentric magnets, or several pairs of adjoining magnets of annular arrangement, having both magnetic poles oriented opposite the disk hub.
REFERENCES:
patent: 3430966 (1969-03-01), Gregg
patent: 4322841 (1982-03-01), Borchard et al.
patent: 4445155 (1984-04-01), Takahashi et al.
patent: 4570194 (1986-02-01), Schatteman
Teac Corporation
Tupper Robert S.
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