发明名称 |
Magnetic recording medium comprising a lower layer containing specific flat acicular alpha-iron oxide powder |
摘要 |
Provided is a magnetic recording medium exhibiting a high C/N (low noise) ratio in high-density magnetic recording. A magnetic recording medium which comprises a nonmagnetic lower layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder provided in this order on a flexible nonmagnetic support. The nonmagnetic lower layer comprises flat acicular alpha-iron oxide powder with a major axis length ranging from 0.05 to 0.5 mum and a ratio of the major width to the minor width (major width/minor width) of the minor axis cross-section when sectioned at an angle perpendicular to the major axis is equal to or higher than 1. The granular nonmagnetic particles have a mean particle diameter equal to or less than 0.04 mum.
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申请公布号 |
US6534168(B2) |
申请公布日期 |
2003.03.18 |
申请号 |
US20010938400 |
申请日期 |
2001.08.23 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
NAOE KOJI;EJIRI KIYOMI |
分类号 |
G11B5/738;(IPC1-7):B32B5/16 |
主分类号 |
G11B5/738 |
代理机构 |
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主权项 |
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地址 |
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