发明名称 |
Method of producing a core for magnetic head |
摘要 |
A core for magnetic head, which has a surface roughness of not higher than 2 mu m in the side wall of a groove for defining the track width of the core, can be obtained by subjecting at least a portion, which defines the track width, of a gapped bar made of ferrite and having a coil turn hole and a magnetic gap, to a laser-induced etching under a condition that a laser light having a power of 50-1,100 mW and a focused beam diameter of not larger than 20 mu m is irradiated to at least the track width-defining portion at a scanning speed of 2-110 mu m/sec in a halogen gas- or halide gas-containing atmosphere kept to a gas pressure of 10-200 Torr.
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申请公布号 |
US4751779(A) |
申请公布日期 |
1988.06.21 |
申请号 |
US19870031768 |
申请日期 |
1987.03.30 |
申请人 |
DS SCANNER CO., LTD.;NGK INSULATORS, LTD. |
发明人 |
NAGATOMO, SHOHEI;TAKAI, MIKIO;SANDAIJI, HIDETO;OHARA, SOJI |
分类号 |
G11B5/133;G11B5/193;(IPC1-7):G11B5/42 |
主分类号 |
G11B5/133 |
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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