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: US287648申请日: 1988-12-21
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公开(公告)号: US4946374A公开(公告)日: 1990-08-07
- 发明人: Satoru Yamaguchi , Jozo Shimizu , Kozaburoh Satoh , Haruo Andoh
- 申请人: Satoru Yamaguchi , Jozo Shimizu , Kozaburoh Satoh , 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: JPX58-46186 19830320
- 主分类号: C09D5/23
- IPC分类号: C09D5/23 ; C09D7/12 ; G11B5/716
摘要:
A magnetic recording medium which comprises a first magnetic layer on a base and a second magnetic layer thereon, the first magnetic layer containing magnetic particles having an average particle length (long axis diameter) of 0.4 to 0.7 .mu., the second magnetic layer containing magnetic particles having an average particle length (long axis diameter) of 0.25 to 0.35 .mu., the coercive force of which being 370 to 460 oersteds, and the ratio of coercive force of the upper or second layer to that of the lower or first magnetic layer being 1.05/l to 1.5/l. The magnetic recording medium has excellent sensitivity and frequency characteristics at entire frequency bands with less noise.
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