Permanent magnet type demagnetizing head

Details Permanent magnet type demagnetizing head Permanent magnet type demagnetizing head

1987-12-10

1989-11-21

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

361151, H01F 1300

Patent

active

048825590

ABSTRACT:
A permanent magnet type demagnetizing head has a first magnetic part disposed on a front part(21a.sup.1, 21a.sup.2, 21a.sup.3) of a tape running surface of a magnetic material, a second magnetic part (21c) disposed on a rear part of the tape running surface and a non-magnetic part or a feeble magnetic part (21b) disposed between the first and the second magnetic parts in the tape running direction; and the first magnetic part is magnetized in a magnetic pattern having plural magnetized regions of one or more N-pole and S-pole; the second magnetic part is magnetized in a magnetic pattern of alternating stripes of N-pole regions and S-pole regions, the boundaries between neighboring N-pole regions and S-pole regions are inclined, and the intensity of magnetization are gradually reduced in the tape running direction.

REFERENCES:
patent: 2897286 (1959-07-01), Atkinson et al.
patent: 3441884 (1969-04-01), Eppe
patent: 4271782 (1981-06-01), Bate et al.

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