公开(公告)号：US20170032814A1

公开(公告)日：2017-02-02

申请号：US15223720

申请日：2016-07-29

Applicant: FUJIFILM Corporation

Inventor： Junpei ISHIDA

IPC: G11B5/738 ,  G11B5/733 ,  G11B5/708 ,  G11B5/73

CPC classification number: G11B5/738 ,  G11B5/7085 ,  G11B5/733

Abstract: The magnetic recording medium has a nonmagnetic layer satisfying: the ratio of the total area accounted for by voids observed to the area of the observed region falls within a range of 13.0% to 25.0% in a sectional image taken by SEM; R+σr is 58.0 nm or less and R−σr is 21.0 nm or greater when denoting the average value of the diameters of corresponding circles for voids observed in the sectional image as R, denoting the standard deviation of the diameters of the corresponding circles as σr; N+σn is 185 voids/μm2 or less and N−σn is 120 voids/μm2 or greater when denoting the average number of voids observed per μm2 unit area of the observed region in the sectional image as N, denoting the standard deviation of this number as σn; and the thickness of the nonmagnetic layer is 0.20 μm or greater.

Abstract translation: 磁记录介质具有非磁性层，其满足：通过SEM观察到的截面图像，观察到的空隙所占的总面积与观察区域的面积的比率落在13.0％〜25.0％的范围内; R +σr为58.0nm以下，R-σr为21.0nm以上，将截面图像中观察到的空隙的相应圆的直径的平均值表示为R，表示相应圆的直径的标准偏差为 σr; N +σn为185个空隙/μm2以下，N-σn为120个空隙/μm2以上，表示在截面图像中观察到的区域每平方米面积观察到的平均空穴数为N，表示该区域的标准偏差 数字为σn; 非磁性层的厚度为0.20μm以上。

公开(公告)号：US20160064024A1

公开(公告)日：2016-03-03

申请号：US14837184

申请日：2015-08-27

Applicant: FUJIFILM CORPORATION

Inventor： Tatsuo MIKAMI ,  Junpei ISHIDA ,  Wataru KIKUCHI

IPC: G11B5/708 ,  G11B5/71 ,  G11B5/73 ,  G11B5/735 ,  G11B5/733

CPC classification number: G11B5/708 ,  G11B5/71 ,  G11B5/733 ,  G11B5/735

Abstract: The magnetic tape comprises, on one surface of a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder, lubricant, and binder, comprises, on a surface of the nonmagnetic layer, a magnetic layer comprising magnetic powder, lubricant, and binder, and comprises, on the opposite surface of the nonmagnetic support from the surface on which the nonmagnetic layer and magnetic layer are present, a backcoat layer comprising nonmagnetic powder, lubricant, and binder, wherein the contact angle for water of a surface of the magnetic layer ranges from 95° to 100°, and the contact angle for water of a surface of the backcoat layer ranges from 95° to 100°.

Abstract translation: 该磁带在非磁性载体的一个表面上包括非磁性粉末，润滑剂和粘合剂的非磁性层，在非磁性层的表面上包括包含磁性粉末，润滑剂和粘合剂的磁性层， 在非磁性载体的表面上存在非磁性层和磁性层的相反表面上，包含非磁性粉末，润滑剂和粘结剂的背涂层，其中磁性层表面的水的接触角为95 °至100°，背涂层表面的水的接触角为95°至100°。