发明名称 |
Magnetic recording medium |
摘要 |
In a magnetic recording medium comprising a nonmagnetic substrate, a first magnetic layer, and a second magnetic layer mounted in this order, the first magnetic layer has a greater coercive force and a lower residual flux density than the second magnetic layer. When the second magnetic layer is directly mounted on the first magnetic layer, the second magnetic layer has a thickness within the range of 0.05-0.5 mu m and a coercive force within the range of 1200-2000 Oe while the first magnetic layer has a coercive force greater than that of the second magnetic layer by 800-2500 Oe and a residual flux density in the range of 30-70% of that of the second magnetic layer. When a nonmagnetic layer is held between the first and second magnetic layers, the first magnetic layer has a coercive force not smaller than 2000 Oe and a residual flux density not greater than 70% of that of the second magnetic layer while the second magnetic layer has a coercive force not smaller than 1200 Oe, a residual flux density not lower than 1600 G, and a thickness not greater than 0.5 mu m.
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申请公布号 |
US5518804(A) |
申请公布日期 |
1996.05.21 |
申请号 |
US19940278124 |
申请日期 |
1994.07.21 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
MIZUNO, CHIAKI;SUGISAKI, TSUTOMU;KOJIMA, MASAYA |
分类号 |
G11B5/716;(IPC1-7):G11B5/66;B32B7/02;B32B5/16 |
主分类号 |
G11B5/716 |
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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