发明名称 |
Method for recording servo control signals on a magnetic disc |
摘要 |
A magnetic record medium is subjected to a first magnetic field for uniformly magnetizing the medium in a direction of the thickness thereof. The uniformly magnetized medium is placed in face-to-face contact with a ferromagnetic member on which a plurality of spaced geometrically varying regions are arranged in track turns and subjected to a second magnetic field oriented in a direction opposite to the direction of orientation of the first magnetic field to produce a plurality of spaced oppositely magnetized regions in the record medium.
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申请公布号 |
US4644416(A) |
申请公布日期 |
1987.02.17 |
申请号 |
US19850772936 |
申请日期 |
1985.09.05 |
申请人 |
VICTOR COMPANY OF JAPAN, LTD. |
发明人 |
YAMADA, YASUHIRO |
分类号 |
G11B5/596;G11B5/02;G11B5/58;G11B5/852;G11B5/86;(IPC1-7):G11B5/86 |
主分类号 |
G11B5/596 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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