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    • 11. 发明授权
    • Magnetic recording and reproducing method and magnetic recording medium employed for the same
    • 用于其的磁记录和再现方法和磁记录介质
    • US06791803B2
    • 2004-09-14
    • US10218569
    • 2002-08-15
    • Shinji SaitoNobuo YamazakiHitoshi Noguchi
    • Shinji SaitoNobuo YamazakiHitoshi Noguchi
    • G11B502
    • G11B5/714G11B5/70G11B5/70678Y10T428/257
    • Provided are a method of magnetic recording and reproducing capable of permitting high density recording on magnetic recording media even under the condition of high data transfer rates and yielding adequate recording and reproduction characteristics when an MR head is used in reproduction, and a magnetic recording medium capable of being used in this magnetic recording and reproducing method. The magnetic recording and reproducing method is a method for reproducing a signal magnetically recorded on a magnetic recording medium with a magnetoresistive (MR) head. The magnetic recording medium comprises a substantially nonmagnetic lower layer and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on at least one side of a nonmagnetic support, in which said hexagonal ferrite ferromagnetic powder has a mean plate diameter ranging from 15 to 40 nm and a mean plate thickness ranging from 4 to 15 nm, and said magnetic layer has a coercive force Hc ranging from 143.3 to 318.4 kA/m, and said signal magnetically recorded has a maximum recording frequency ranging from 10 to 80 MHz.
    • 提供了一种磁记录和再现方法,即使在高数据传输速率的条件下也能够在磁记录介质上进行高密度记录,并且当在再现中使用MR磁头时产生足够的记录和再现特性,以及能够使用磁记录介质 被用于这种磁记录和再现方法中。 磁记录和再现方法是一种利用磁阻(MR)磁头再现磁记录在磁记录介质上的信号的方法。 磁记录介质在非磁性载体的至少一侧上依次包括基本上非磁性的下层和包含六方铁素体铁磁粉末和粘合剂的磁性层,其中所述六方晶系铁氧体铁磁粉末的平均板直径范围为 15至40nm,平均板厚度范围为4至15nm,所述磁性层的矫顽力Hc为143.3至318.4kA / m,磁性记录的所述信号具有10至80MHz的最大记录频率 。
    • 16. 发明授权
    • Disc type magnetic recording medium
    • 盘式磁记录介质
    • US5935674A
    • 1999-08-10
    • US886468
    • 1997-07-01
    • Shinji SaitoHitoshi NoguchiYasushi Endo
    • Shinji SaitoHitoshi NoguchiYasushi Endo
    • G11B5/70G11B5/73G11B5/82
    • G11B5/70G11B5/7305Y10S428/90Y10T428/24355
    • The present invention provides a disc magnetic recording medium which provides remarkable improvements in electromagnetic characteristics, particularly high density recording properties, and exhibits excellent magnetic properties with various sizes. A disc type magnetic recording medium is disclosed, comprising a substantially non-magnetic layer and a magnetic layer provided on a non-magnetic support in this order, said magnetic layer comprising a ferromagnetic metal fine powder or ferromagnetic hexagonal ferrite fine powder dispersed in a binder, wherein said non-magnetic support is an aramide or polyethylene naphthalate having a central plane average surface roughness SRa of not more than 10 mm and there is the following relationship between the thickness d (.mu.m) of the non-magnetic support and the outermost diameter D (mm) of the recording area:1.25.ltoreq.D/d.ltoreq.2.50 (when the non-magnetic support is an aramide)1.00.ltoreq.D/d.ltoreq.2.00 (when the non-magnetic support is a polyethylene naphthalate)
    • 本发明提供一种盘式磁记录介质,其提供了电磁特性,特别是高密度记录性能方面的显着改进,并表现出优异的各种尺寸的磁特性。 公开了一种盘式磁记录介质,其包括基本上非磁性层和设置在非磁性载体上的磁性层,所述磁性层包含分散在粘合剂中的铁磁性金属细粉末或铁磁六方铁氧体细粉末 其中所述非磁性载体是中心平面平均表面粗糙度SRa不超过10mm的芳族聚酰胺或聚萘二甲酸乙二醇酯,并且非磁性载体的厚度d(μm)与最外层 记录区域的直径D(mm):1.25