公开(公告)号：US11264054B2

公开(公告)日：2022-03-01

申请号：US17155695

申请日：2021-01-22

Applicant: FUJIFILM Corporation

Inventor： Norihito Kasada ,  So Matsuyama ,  Atsushi Musha ,  Shota Kamimura

IPC: G11B5/733 ,  G11B5/187 ,  G11B5/008 ,  G11B5/706

Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.

公开(公告)号：US11735219B2

公开(公告)日：2023-08-22

申请号：US17680904

申请日：2022-02-25

Applicant: FUJIFILM Corporation

Inventor： Shota Kamimura ,  Yuto Murata ,  Tomohide Ueyama ,  Norihito Kasada

IPC: G11B5/78 ,  G11B5/00 ,  G11B15/093 ,  G11B15/43

CPC classification number: G11B5/78 ,  G11B15/43 ,  B65H2701/378

Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A maximum value of a deviation of a center position of an average minimum region reference circle of a trajectory of one rotation drawn by the magnetic tape, in a case where the wound magnetic tape is drawn out from the core core is 100 μm or less for three points of the magnetic tape in a width direction.

公开(公告)号：US11842752B2

公开(公告)日：2023-12-12

申请号：US17680961

申请日：2022-02-25

Applicant: FUJIFILM Corporation

Inventor： Shota Kamimura ,  Yuto Murata ,  Tomohide Ueyama ,  Norihito Kasada

IPC: G11B23/107 ,  G11B5/78

CPC classification number: G11B23/107 ,  G11B5/78

Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, and the roundness of the trajectory of one rotation drawn by the magnetic tape in a case where the wound magnetic tape is pulled out from the core is 100 μm or less as the arithmetic mean of the measured values at three points in the width direction of the magnetic tape.