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    • 1. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06627293B1
    • 2003-09-30
    • US09663091
    • 2000-09-15
    • Makoto InoueAkiko Watanabe
    • Makoto InoueAkiko Watanabe
    • G11B5733
    • G11B5/738Y10T428/24355Y10T428/25Y10T428/257Y10T428/265
    • The present invention provides a magnetic recording medium comprising a non-magnetic support body coated with a lower undercoat layer formed from a non-magnetic paint prepared by kneading at least a binder and a non-magnetic powder and an upper magnetic layer formed on the lower undercoat layer, from a magnetic paint prepared by kneading at least a binder and a magnetic powder, wherein the non-magnetic powder includes a non-magnetic pigment whose surface has an area coated with graphite-shaped crystal of carbon black. The lower undercoat layer arranged under the magnetic layer has a preferable surface characteristic and an excellent electric conductivity, and the magnetic layer formed as a thin film has a preferable electromagnetic conversion characteristic.
    • 本发明提供一种磁记录介质,其包括涂覆有由通过捏合至少粘合剂和非磁性粉末而制备的非磁性涂料形成的下底涂层和形成在下层上的上磁性层的非磁性支撑体 从通过捏合至少粘合剂和磁性粉末制备的磁性涂料得到的非涂料层,其中非磁性粉末包括其表面具有涂覆有炭黑的石墨状晶体的面积的非磁性颜料。 布置在磁性层下方的下底涂层具有优选的表面特性和优异的导电性,并且形成为薄膜的磁性层具有优选的电磁转换特性。
    • 6. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06991861B2
    • 2006-01-31
    • US10863714
    • 2004-06-08
    • Akiko WatanabeKatsunori MaeshimaTomoo FukudaNoboru Sekiguchi
    • Akiko WatanabeKatsunori MaeshimaTomoo FukudaNoboru Sekiguchi
    • G11B5/706
    • G11B5/714G11B5/70
    • The coating-type magnetic recording medium has a non-magnetic layer mainly composed of a non-magnetic powder and binder, and a magnetic layer mainly composed of a ferromagnetic powder and a binder, which are stacked in this order on a non-magnetic substrate, wherein dispersion σL/L of long-axis length of all ferromagnetic powder particles contained in the magnetic layer falls in a range of σL/L≦±10%, where L is an average long-axis length and σL is a standard deviation thereof, and dispersion σW/W of short-axis length of all ferromagnetic powders contained in the magnetic layer falls in a range of σW/W≦±15%, where W is an average short-axis length and σW is a standard deviation thereof. The average long-axis length L is typically adjusted within the range of 0.08 μm and 0.12 μm, and the Switching Field Distribution (SFD) of the medium is adjusted to 0.25 or less.
    • 涂布型磁记录介质具有主要由非磁性粉末和粘合剂组成的非磁性层和主要由铁磁性粉末和粘合剂组成的磁性层,它们依次层叠在非磁性基板上 其中,包含在磁性层中的所有铁磁性粉末颗粒的长轴长度的分散SigmaL / L落在sLL /L≤±10%的范围内,其中L是平均长轴长度,sigmaL是标准偏差 并且包含在磁性层中的所有铁磁粉末的短轴长度的色散σW / W落在σW/ W <=±15%的范围内,其中W是平均短轴长度,sigmaW是标准偏差 其中。 平均长轴长度L通常在0.08μm和0.12μm的范围内调节,并且将介质的开关场分布(SFD)调节至0.25或更小。