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    • 2. 发明申请
    • MAGNETIC TAPE AND MAGNETIC TAPE CARTRIDGE
    • 磁带和磁带盒
    • US20080107921A1
    • 2008-05-08
    • US11766491
    • 2007-06-21
    • Sadamu KuseTsugihiro DoiTetsutaro InoueMikio KishimotoYuji SasakiHideaki Watanabe
    • Sadamu KuseTsugihiro DoiTetsutaro InoueMikio KishimotoYuji SasakiHideaki Watanabe
    • G11B5/39G11B5/62
    • B82Y25/00G11B5/584G11B5/70G11B5/70615G11B5/70621G11B5/712G11B5/714G11B5/716G11B5/73G11B5/735G11B5/78G11B23/107H01F1/0054H01F1/0551H01F1/059Y10T428/1107Y10T428/2991
    • A magnetic recording medium comprising a non-magnetic support; at least one lower magnetic layer containing magnetic powder and a binder resin, which is formed on one side of the non-magnetic support with or without a non-magnetic primer layer interposed between the non-magnetic support and the lower magnetic layer; at least one non-magnetic intermediate layer containing non-magnetic powder and a binder resin, which is formed on the lower magnetic layer; at least one upper magnetic layer containing magnetic powder and a binder resin, which is formed on the non-magnetic intermediate layer; and a back layer which is formed on the other side of the non-magnetic support, characterized in that the magnetic powder contained in the uppermost magnetic layer of the upper magnetic layer is iron type magnetic powder which comprises substantially spherical or ellipsoidal particles with a number-average particle diameter of 5 to 50 nm and an average axial ratio of 1 to 2, each of said particles containing iron or containing iron as a main component and a transition element; and that the total thickness of the magnetic recording medium is 6 μm or less. This magnetic recording medium has electromagnetic conversion, characteristics which cannot be achieved by any of conventional magnetic recording media, and also is expected to have excellent magnetic serve characteristics.
    • 一种磁记录介质,包括非磁性载体; 至少一个含有磁性粉末和粘合剂树脂的下磁性层,其形成在非磁性载体的一侧上,该非磁性载体具有或不具有介于非磁性载体和下部磁性层之间的非磁性底漆层; 至少一个含有非磁性粉末和粘结剂树脂的非磁性中间层,形成在下部磁性层上; 至少一个含有磁性粉末和粘结剂树脂的上磁性层,形成在非磁性中间层上; 以及形成在所述非磁性载体的另一侧的背层,其特征在于,包含在所述上磁性层的最上层磁性层中的磁性粉末是铁型磁粉,其包含基本上具有数量的球形或椭圆形颗粒 平均粒径为5〜50nm,平均轴比为1〜2,所述粒子含有铁或以铁为主要成分,过渡元素为主成分。 并且磁记录介质的总厚度为6μm或更小。 这种磁记录介质具有电磁转换特性,这些特性通过任何常规的磁记录介质都不能实现,并且预期具有优异的磁性能特性。
    • 5. 发明授权
    • Magnetic tape and magnetic tape cartridge
    • 磁带和磁带盒
    • US07267896B2
    • 2007-09-11
    • US10389880
    • 2003-03-18
    • Sadamu KuseTsugihiro DoiTetsutaro InoueMikio KishimotoYuji SasakiHideaki Watanabe
    • Sadamu KuseTsugihiro DoiTetsutaro InoueMikio KishimotoYuji SasakiHideaki Watanabe
    • G11B5/706
    • B82Y25/00G11B5/584G11B5/70G11B5/70615G11B5/70621G11B5/712G11B5/714G11B5/716G11B5/735G11B5/738G11B5/78G11B23/107H01F1/0054H01F1/0551H01F1/059Y10T428/1107Y10T428/2991
    • A magnetic recording medium comprising a non-magnetic support; at least one lower magnetic layer containing magnetic powder and a binder resin, which is formed on one side of the non-magnetic support with or without a non-magnetic primer layer interposed between the non-magnetic support and the lower magnetic layer; at least one non-magnetic intermediate layer containing non-magnetic powder and a binder resin, which is formed on the lower magnetic layer; at least one upper magnetic layer containing magnetic powder and a binder resin, which is formed on the non-magnetic intermediate layer; and a back layer which is formed on the other side of the non-magnetic support, characterized in that the magnetic powder contained in the uppermost magnetic layer of the upper magnetic layer is iron type magnetic powder which comprises substantially spherical or ellipsoidal particles with a number-average particle diameter of 5 to 50 nm and an average axial ratio of 1 to 2, each of said particles containing iron or containing iron as a main component and a transition element; and that the total thickness of the magnetic recording medium is 6 μm or less. This magnetic recording medium has electromagnetic conversion characteristics which cannot be achieved by any of conventional magnetic recording media, and also is expected to have excellent magnetic serve characteristics.
    • 一种磁记录介质,包括非磁性载体; 至少一个含有磁性粉末和粘合剂树脂的下磁性层,其形成在非磁性载体的一侧上,该非磁性载体具有或不具有介于非磁性载体和下部磁性层之间的非磁性底漆层; 至少一个含有非磁性粉末和粘结剂树脂的非磁性中间层,形成在下部磁性层上; 至少一个含有磁性粉末和粘结剂树脂的上磁性层,形成在非磁性中间层上; 以及形成在所述非磁性载体的另一侧的背层,其特征在于,包含在所述上磁性层的最上层磁性层中的磁性粉末是铁型磁粉,其包含基本上具有数量的球形或椭圆形颗粒 平均粒径为5〜50nm,平均轴比为1〜2,所述粒子含有铁或以铁为主要成分,过渡元素为主成分。 并且磁记录介质的总厚度为6μm或更小。 该磁记录介质具有通过任何常规磁记录介质无法实现的电磁转换特性,并且预期具有优异的磁性能特性。