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    MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE
    11.
    发明申请
    MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE 审中-公开

    公开(公告)号：US20190304498A1

    公开(公告)日：2019-10-03

    申请号：US16368199

    申请日：2019-03-28

    Applicant: FUJIFILM Corporation

    Inventor： Eiki OZAWA ,  Takuto KUROKAWA

    IPC: G11B5/706 ,  G11B5/78 ,  G11B5/127

    Abstract: The magnetic recording medium including: a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding a surface of the magnetic layer is 1.0 nm to 1.6 nm, and a difference (Safter−Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after methyl ethyl ketone cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the magnetic layer before methyl ethyl ketone cleaning is greater than 0 nm and equal to or smaller than 15.0 nm.

    MAGNETIC TAPE
    12.
    发明申请
    MAGNETIC TAPE 审中-公开

    公开(公告)号：US20190027181A1

    公开(公告)日：2019-01-24

    申请号：US16038847

    申请日：2018-07-18

    Applicant: FUJIFILM Corporation

    Inventor： Eiki OZAWA ,  Toshio TADA ,  Norihito KASADA ,  Takuto KUROKAWA

    IPC: G11B5/78 ,  G11B5/71 ,  G11B5/712 ,  G11B5/706 ,  G11B5/008

    Abstract: Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110)/Int(114) of a hexagonal ferrite crystal structure obtained by an XRD analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between the spacings measured by optical interferometry regarding the surface of the back coating layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.

    MAGNETIC RECORDING MEDIUM
    13.
    发明申请
    MAGNETIC RECORDING MEDIUM 审中-公开

    公开(公告)号：US20190027176A1

    公开(公告)日：2019-01-24

    申请号：US16037564

    申请日：2018-07-17

    Applicant: FUJIFILM Corporation

    Inventor： Takuto KUROKAWA ,  Norihito KASADA ,  Toshio TADA ,  Eiki OZAWA

    IPC: G11B5/706

    CPC classification number: G11B5/70615 ,  G11B5/70 ,  G11B5/70678 ,  G11B5/7085

    Abstract: The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.

    MAGNETIC TAPE
    14.
    发明申请
    MAGNETIC TAPE 审中-公开

    公开(公告)号：US20180240490A1

    公开(公告)日：2018-08-23

    申请号：US15900379

    申请日：2018-02-20

    Applicant: FUJIFILM Corporation

    Inventor： Takuto KUROKAWA ,  Norihito KASADA

    IPC: G11B5/71 ,  G11B5/702 ,  C08L75/04 ,  G11B5/708 ,  G11B5/73

    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°.

    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    20.
    发明申请
    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS 有权

    公开(公告)号：US20220020392A1

    公开(公告)日：2022-01-20

    申请号：US17376164

    申请日：2021-07-15

    Applicant: FUJIFILM Corporation

    Inventor： Takuto KUROKAWA ,  So MATSUYAMA ,  Norihito KASADA

    IPC: G11B5/706 ,  G11B5/735 ,  G11B5/714 ,  G11B5/592

    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including a ferromagnetic powder, in which in an environment of a temperature of 32° C. and a relative humidity of 80%, a frictional force F0.2 N on a magnetic layer surface with respect to an LTO8 head, which is measured by applying a tension of 0.2 N in a longitudinal direction of the magnetic tape, is in a range of 4 to 15 gf, and a frictional force F1.5 N on the magnetic layer surface with respect to the LTO8 head, which is measured by applying a tension of 1.5 N in the longitudinal direction of the magnetic tape, is in a range of 4 to 15 gf.

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