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    • 18. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US07531251B2
    • 2009-05-12
    • US11329668
    • 2006-01-11
    • Ichiro KanagawaKazuhiko SuzukiRyoichi HiratsukaHidetoshi Honda
    • Ichiro KanagawaKazuhiko SuzukiRyoichi HiratsukaHidetoshi Honda
    • G11B5/66
    • G11B5/738G11B5/70G11B5/72G11B5/7305
    • A magnetic recording medium includes a nonmagnetic support having a thickness less than 7 μm and a width of 8 mm; a ferromagnetic metal layer disposed on a surface of the nonmagnetic support; and a reinforcing layer disposed on the other surface of the nonmagnetic support. The magnetic recording medium has a flexural rigidity EI of 5.9×10−8 to 1.3×10−7 N·m (6.0×10−4 to 1.3×10−3 g·cm). The flexural rigidity EI is determined by the following equation: EI=(π/4−2/π)·W·a3/d·b×9.8×10−5 (wherein W is a load that causes an annular test piece having a radius of a cm and a width of b cm which is prepared by cutting a magnetic sheet formed of the magnetic recording medium to undergo a radial displacement d of 0.2πa).
    • 磁记录介质包括厚度小于7μm,宽度为8mm的非磁性载体; 设置在所述非磁性载体的表面上的铁磁金属层; 以及设置在非磁性载体的另一个表面上的加强层。 磁记录介质的抗弯刚度EI为5.9×10 -8〜1.3×10 -7 N.m(6.0×10 -4〜1.3×10 -3 g·cm)。 弯曲刚度EI由以下等式确定:<?in-line-formula description =“In-line formula”end =“lead”?> EI =(pi / 4-2 / pi).Wa3 / d .bx9.8x10-5 <?in-line-formula description =“In-line Formulas”end =“tail”?>(其中W是使半径为cm,宽度为 bcm,其通过切割由磁记录介质形成的磁片来进行径向位移d为0.2pia)。