公开(公告)号：US4624883A

公开(公告)日：1986-11-25

申请号：US590796

申请日：1984-03-19

申请人： Satoru Yamaguchi ,  Kozaburoh Satoh ,  Jozo Shimizu ,  Haruo Andoh

发明人： Satoru Yamaguchi ,  Kozaburoh Satoh ,  Jozo Shimizu ,  Haruo Andoh

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/716 ,  G11B5/70

CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/24975 ,  Y10T428/256 ,  Y10T428/257

摘要： A magnetic recording medium which comprises a first magnetic layer on a base and a second magnetic layer over the first magnetic layer, the second magnetic layer containing magnetic particles having an average particle length (long axis diameter) of not more than 0.35.mu. , with a coercive force of from 660 to 760 oersteds, and the ratio of the coercive force of the upper or second magnetic layer to that of the lower or first magnetic layer being 1.1/1 to 1.6/1. The resulting magnetic recording medium has excellent sensitivity and frequency characteristics over the entire frequency bands with less noise.

摘要翻译： 一种磁记录介质，包括基底上的第一磁性层和第一磁性层上的第二磁性层，所述第二磁性层含有平均粒径（长轴直径）不大于0.35μm的磁性颗粒，其中 660〜760奥斯特的矫顽力，上层或第二层的矫顽力与下层或第一层的矫顽力的比值为1.1 / 1〜1.6 / 1。 所得到的磁记录介质在噪声较小的整个频带上具有优异的灵敏度和频率特性。

公开(公告)号：US4946374A

公开(公告)日：1990-08-07

申请号：US287648

申请日：1988-12-21

申请人： Satoru Yamaguchi ,  Jozo Shimizu ,  Kozaburoh Satoh ,  Haruo Andoh

发明人： Satoru Yamaguchi ,  Jozo Shimizu ,  Kozaburoh Satoh ,  Haruo Andoh

IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/716

CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257

摘要： A magnetic recording medium which comprises a first magnetic layer on a base and a second magnetic layer thereon, the first magnetic layer containing magnetic particles having an average particle length (long axis diameter) of 0.4 to 0.7 .mu., the second magnetic layer containing magnetic particles having an average particle length (long axis diameter) of 0.25 to 0.35 .mu., the coercive force of which being 370 to 460 oersteds, and the ratio of coercive force of the upper or second layer to that of the lower or first magnetic layer being 1.05/l to 1.5/l. The magnetic recording medium has excellent sensitivity and frequency characteristics at entire frequency bands with less noise.

摘要翻译： 一种磁记录介质，包括在基底上的第一磁性层和其上的第二磁性层，所述第一磁性层含有平均粒子长度（长轴直径）为0.4至0.7μm的磁性颗粒，所述第二磁性层含有磁性颗粒 平均粒径（长轴直径）为0.25〜0.35μm，矫顽力为370〜460奥斯特，上层或第二层与下层或第一层的矫顽力比为1.05 / l至1.5 / l。 磁记录介质在噪声较小的整个频段具有优异的灵敏度和频率特性。