Magnetic hold-down for recording disc

Details Magnetic hold-down for recording disc Magnetic hold-down for recording disc

1982-12-20

1986-04-08

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360133, G11B 5012

Patent

active

045816670

ABSTRACT:
Three or more ferromagnetic elements are symmetrically arranged about the face of a permanent-magnet rotor of a turntable motor. Those elements extend to a plane perpendicular to the axis of a rotor. When a magnetic recording disc which has a rigid, planar ferromagnetic surface is moved toward that plane, magnetic attraction secures the disc to the turntable. Preferably the turntable includes a spindle which fits into a central opening in the disc to center the disc on the turntable.

REFERENCES:
patent: 3593327 (1971-07-01), Shill
patent: 3706085 (1972-12-01), Mowrey
patent: 4224648 (1980-09-01), Roling
patent: 4351047 (1982-09-01), Redlich et al.

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