发明授权
- 专利标题: Magnetic recording medium
- 专利标题(中): 磁记录介质
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申请号: US590796申请日: 1984-03-19
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公开(公告)号: US4624883A公开(公告)日: 1986-11-25
- 发明人: Satoru Yamaguchi , Kozaburoh Satoh , Jozo Shimizu , Haruo Andoh
- 申请人: Satoru Yamaguchi , Kozaburoh Satoh , Jozo Shimizu , Haruo Andoh
- 申请人地址: JPX Osaka
- 专利权人: Hitachi Maxell, Ltd.
- 当前专利权人: Hitachi Maxell, Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX58-46365 19830320
- 主分类号: C09D5/23
- IPC分类号: C09D5/23 ; C09D7/12 ; G11B5/716 ; G11B5/70
摘要:
A magnetic recording medium which comprises a first magnetic layer on a base and a second magnetic layer over the first magnetic layer, the second magnetic layer containing magnetic particles having an average particle length (long axis diameter) of not more than 0.35.mu. , with a coercive force of from 660 to 760 oersteds, and the ratio of the coercive force of the upper or second magnetic layer to that of the lower or first magnetic layer being 1.1/1 to 1.6/1. The resulting magnetic recording medium has excellent sensitivity and frequency characteristics over the entire frequency bands with less noise.