发明名称 |
MAGNETAUFZEICHNUNGSMEDIUM |
摘要 |
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon plural magnetic layers comprising ferromagnetic particles dispersed in a binder, said ferromagnetic particles consisting of an iron oxide or a cobalt-containing iron oxide, said plural magnetic layers comprising at least an upper magnetic layer and a lower magnetic layer, wherein said upper magnetic layer has a coercive force (Hc) of from 650 to 1000 Oe, a crystallite size of the ferromagnetic particles contained in said upper magnetic layer is less than 500 ANGSTROM as measured by a X-ray diffraction method, an average length in the long axis of the ferromagnetic particles contained in said upper magnetic layer is from 0.1 microns to less than 0.25 microns as measured by a transmission type electronmicroscope, said lower magnetic layer has a coercive force (Hc) of from 0.6 to 1.0 times that of said upper magnetic layer, a crystallite size of the ferromagnetic particles contained in said lower magnetic layer is larger than that of said upper magnetic layer and is in the range of 500 ANGSTROM or less, and an average length in the long axis of the ferromagnetic particles contained in said lower magnetic layer is larger than that of said upper magnetic layer and is in the range of from more than 0.1 microns to less than 0.25 microns. |
申请公布号 |
DE3934897(A1) |
申请公布日期 |
1990.04.26 |
申请号 |
DE19893934897 |
申请日期 |
1989.10.19 |
申请人 |
FUJI PHOTO FILM CO., LTD., MINAMI-ASHIGARA, KANAGAWA, JP |
发明人 |
NOGUCHI, HITOSHI;SAITO, SHINJI;INABA, HIROO;OGAWA, HIROSHI, ODAWARA, KANAGAWA, JP |
分类号 |
G11B5/706;C09D5/23;C09D7/12;G11B5/716 |
主分类号 |
G11B5/706 |
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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