Method of and device for demagnetizing magnetic recording medium

Details Method of and device for demagnetizing magnetic recording medium Method of and device for demagnetizing magnetic recording medium

1990-07-06

1991-10-01

Pellinen, A. D.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

361149, 361267, G11B 503

Patent

active

050538934

ABSTRACT:
A magnetic recording medium such as a magnetic recording tape or disk is demagnetized by applying a saturating magnetic field to the magnetic recording medium, then applying an unsaturating magnetic field to the magnetic recording medium in a direction opposite to the direction of the saturating magnetic field, and finally applying an alternating magnetic field to the magnetic recording medium to remove residual magnetism which has been produced on the magnetic recording medium by the unsaturating magnetic field. The saturating, unsaturating, and alternating magnetic fields are generated respectively by a first DC erasing head, a second DC erasing head, and an AC erasing head, which are arranged at spaced intervals in the order named in the direction in which the magnetic recording medium is continuously moved.

REFERENCES:
patent: 2993096 (1961-07-01), Radocy
patent: 4471403 (1984-09-01), Dress, Jr. et al.
patent: 4956728 (1990-09-01), Hayata et al.

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