- 专利标题: Magnetic recording medium
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申请号: US448667申请日: 1989-12-11
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公开(公告)号: US4992330A公开(公告)日: 1991-02-12
- 发明人: Setsuko Kawahara , Noboru Koyama , Yasushi Nakano , Noboru Nakajima
- 申请人: Setsuko Kawahara , Noboru Koyama , Yasushi Nakano , Noboru Nakajima
- 申请人地址: JPX Tokyo
- 专利权人: Konica Corporation
- 当前专利权人: Konica Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX63-314490 19881212; JPX1-35545 19890214
- 主分类号: G11B5/708
- IPC分类号: G11B5/708 ; G11B5/716
摘要:
A magnetic recording medium is disclosed, which has excellent electro-magnetic conversion characteristics and is improved in drop-out. The magnetic recording medium comprises a non-magnetic support and a plurality of magnetic layers provided on the support, and the magnetic layer being provided farthest from said support among these magnetic layers comprises a magnetic powder and a carbon black in an amount of not more than 1 part per 100 parts by weight of said magnetic powder; and another magnetic layer comprising a magnetic powder has a thickness of not more than 2.5 .mu.m, and 900 nm light-transmittance of said magnetic medium is not more than 0.1%.
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