Erasing device

Details Erasing device Erasing device

1985-02-14

1988-01-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

047179759

ABSTRACT:
An erasing device includes a magnetic head, a drive motor for rotating a magnetic disc relative to the magnetic head, an erase signal source for producing an erase signal which varies periodically, and apparatus for causing the head to generate magnetic fields with the erase signal, wherein the frequency f.sub.V of rotation of the magnetic disc and the frequency f.sub.E of the erase signal together satisfy the following condition so that no nodes of the erasing fields are fixed at any point on a track of the magnetic disc during a plurality of rotations of the magnetic disc:

REFERENCES:
patent: 4005482 (1977-01-01), Castro et al.
patent: 4438466 (1984-03-01), Fawkes et al.

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