发明名称 |
Permanent magnet type demagnetizing head |
摘要 |
A permanent magnet type demagnetizing head has a first magnetic part disposed on a front part(21a1, 21a2, 21a3) 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.
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申请公布号 |
US4882559(A) |
申请公布日期 |
1989.11.21 |
申请号 |
US19870131392 |
申请日期 |
1987.12.10 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
KOIZUMI, NOBORU;YAMAZAKI, KAZUYA |
分类号 |
G11B5/325 |
主分类号 |
G11B5/325 |
代理机构 |
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