Method for erasing information recorded on magnetic tape with re

Details Method for erasing information recorded on magnetic tape with re Method for erasing information recorded on magnetic tape with re

1994-06-14

1995-09-05

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

G11B 503

Patent

active

054484251

ABSTRACT:
A method for erasing information recorded on a magnetic tape by a magnetic erase head having a magnetic core having a magnetic gap of a predetermined width and a coil wound on the core. An erasing current is flown through the coil to generate an erasing magnetic field above the magnetic gap. The magnetic field generated by that current has a profile defined by a first zero point, first and second peak points, and a second zero point above the magnetic erase head. The magnetic tape having information recorded therein through the magnetic field is moved above the magnetic erase head. The frequency of the erasing current and a moving speed of the magnetic tape relative to the magnetic erase head are set such that the magnetic field changes in phase at least three times during a time in which the magnetic tape is moved in a moving direction of the magnetic tape by a distance which is determined by the first zero point and the first peak point of the magnetic field profile.

REFERENCES:
patent: 4466027 (1984-08-01), Howell et al.
patent: 4622614 (1986-11-01), Yamashita et al.
patent: 4851936 (1989-07-01), Soga
K. Yamashita, et al. "Sendust Sputtered Ferrite Flying Erase Head", IEEE Transaction Magnetics, vol. MAG 20, No. 5, 1984.

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