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    • 4. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06602576B2
    • 2003-08-05
    • US09798807
    • 2001-03-02
    • Koji NaoeKiyomi Ejiri
    • Koji NaoeKiyomi Ejiri
    • G11B566
    • G11B5/738G11B5/70G11B5/7021G11B5/70621G11B5/714Y10S428/90Y10T428/24355Y10T428/24942Y10T428/24975Y10T428/265Y10T428/31609
    • The present invention aims to provide a magnetic recording medium for digital recording/reproducing systems having a small bit area, i.e. a short recording wavelength and a narrow track width, which is a particulate magnetic recording medium showing good electromagnetic characteristics. A magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder provided in this order on a nonmagnetic substrate wherein said magnetic layer has an average thickness of 0.01-0.1 &mgr;m and the ratio of the area of magnetic recording defects generated upon magnetic development after recording at the shortest recording wavelength to the total magnetic recording area is 0.2-20%.
    • 本发明的目的是提供一种用于数字记录/再现系统的磁记录介质,其具有小的位面积,即短记录波长和窄轨迹宽度,其是表现出良好电磁特性的微粒磁记录介质。 包含非磁性粉末和粘合剂的非磁性层和含有铁磁性粉末和粘合剂的磁性层按顺序设置在非磁性基材上,其中所述磁性层的平均厚度为0.01-0.1μm,磁性区域的比例 在以最短记录波长记录到总磁记录面积之后,在磁性显影时产生的记录缺陷为0.2-20%。
    • 6. 发明授权
    • Magnetic recording medium comprising a lower layer containing specific flat acicular &agr;-iron oxide powder
    • 磁性记录介质包含含有特定的扁平针状α-氧化铁粉末的下层
    • US06534168B2
    • 2003-03-18
    • US09938400
    • 2001-08-23
    • Koji NaoeKiyomi Ejiri
    • Koji NaoeKiyomi Ejiri
    • B32B516
    • G11B5/738Y10S428/90Y10T428/257
    • 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 &agr;-iron oxide powder with a major axis length ranging from 0.05 to 0.5 &mgr;m 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 &mgr;m.
    • 提供了一种在高密度磁记录中表现出高C / N(低噪声)比的磁记录介质。 一种磁记录介质,其包括非磁性粉末和粘合剂的非磁性下层和包含铁磁性粉末和粘合剂的磁性层,该磁性层按顺序设置在柔性非磁性载体上。 非磁性下层包括长轴长度为0.05-0.5μm的扁平针状α-氧化铁粉末,当切断时短轴截面的主宽度与较小宽度(主宽度/次宽度)的比率 垂直于长轴的角度等于或大于1.颗粒状非磁性颗粒的平均粒径等于或小于0.04μm。
    • 8. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US06372325B1
    • 2002-04-16
    • US09524757
    • 2000-03-13
    • Kiyomi EjiriKoji NaoeMasatoshi Takahashi
    • Kiyomi EjiriKoji NaoeMasatoshi Takahashi
    • G11B568
    • G11B5/70Y10S428/90Y10T428/24355
    • Disclosed is a magnetic recording medium having a flexible nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder on the support, and a magnetic layer containing a ferromagnetic powder and a binder. The magnetic layer has an average thickness d of 0.01 to 0.3 &mgr;m, a ratio &sgr;/d of a standard deviation &sgr; in the thickness of the magnetic layer to the average thickness d equal to or less than 0.5, and, according to the roughness spectrum of a magnetic layer surface measured with an atomic force microscope, a PSD of 0.5 nm2 or lower in a wavelength of 1 to 5 &mgr;m and a PSD of 0.02 to 0.5 nm2 in a wavelength of 0.5 &mgr;m or more to less than 1 &mgr;m.
    • 公开了一种具有柔性非磁性载体,在载体上含有非磁性粉末和粘合剂的非磁性层以及含有铁磁粉末和粘合剂的磁性层的磁记录介质。 磁性层的平均厚度d为0.01〜0.3μm,磁性层的厚度的标准偏差σ与平均厚度d的比值σ/ d等于或小于0.5,根据粗糙度谱 使用原子力显微镜测量的磁性层表面,波长为1-5μm的0.5nm2以下的PSD,波长为0.5μm以上且小于1μm的PSD为0.02〜0.5nm 2。