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: US492164申请日: 1990-03-13
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公开(公告)号: US5098773A公开(公告)日: 1992-03-24
- 发明人: Shinji Saito , Hiroo Inaba , Hiroshi Ogawa , Hitoshi Noguchi
- 申请人: Shinji Saito , Hiroo Inaba , Hiroshi Ogawa , Hitoshi Noguchi
- 申请人地址: JPX Kanagawa
- 专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人地址: JPX Kanagawa
- 优先权: JPX1-61321 19890314
- 主分类号: C09D5/23
- IPC分类号: C09D5/23 ; C09D127/04 ; C09D127/06 ; C09D175/00 ; C09D175/04 ; G11B5/714 ; G11B5/716
摘要:
A magnetic recording medium having at least two magnetic layers is disclosed, comprising first and second mangetic layers which are successively formed in order on a nonmagnetic support, wherein a coercive force (Hc) of said second magnetic layer is 5.times.10.sup.4 to 1.5.times.10.sup.5 A/m, a ratio (Br/Hc) of a residual magnetic flux density (Br) of said second magnetic layer to the coercive force (Hc) is 2.0.times.10.sup.-6 H/m or more, SFD of said second magnetic layer is 0.6 or less, an average length in the long axis of magnetic particles in said second magnetic layer is 0.25 microns or less, a center line average surface roughness (Ra) of said second magnetic layer is 1/10 or less of the average length in the long axis of the magnetic particles, and a coercive force (Hc') of said first magnetic layer is 2.times.10.sup.4 to 1.times.10.sup.5 A/m.
公开/授权文献
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