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    MAGNETIC RECORDING MEDIUM, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC RECORDING AND REPRODUCING DEVICE
    92.
    发明申请
    MAGNETIC RECORDING MEDIUM, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC RECORDING AND REPRODUCING DEVICE 有权

    公开(公告)号：US20230100028A1

    公开(公告)日：2023-03-30

    申请号：US17955137

    申请日：2022-09-28

    Applicant: FUJIFILM Corporation

    Inventor： Takashi FUJIMOTO ,  Eiki OZAWA

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

    Abstract: A magnetic recording medium including a magnetic layer including a ferromagnetic powder. The ferromagnetic powder is an ε-iron oxide powder, and a ratio of Hr (45°) to Hr (0°)(Hr (45°)/Hr (0°)) is 0.50 or less. The Hr (0°) is a residual coercive force Hr obtained by applying a pulse magnetic field having a pulse width of 0.76 ms in an in-plane direction of the magnetic recording medium, and the Hr (45°) is a residual coercive force Hr obtained by setting an angle of the magnetic recording medium in the in-plane direction to 0°, setting an angle of the magnetic recording medium in a vertical direction to 90°, and making a pulse magnetic field having a pulse width of 0.76 ms be incident from a direction inclined by 45° toward the vertical direction from the in-plane direction and applying the pulse magnetic field to the magnetic recording medium.

    Magnetic recording and reproducing device
    95.
    发明授权
    Magnetic recording and reproducing device 有权

    公开(公告)号：US11348604B2

    公开(公告)日：2022-05-31

    申请号：US17338688

    申请日：2021-06-04

    Applicant: FUJIFILM Corporation

    Inventor： So Matsuyama ,  Norihito Kasada ,  Takuto Kurokawa

    IPC: G11B5/78 ,  G11B5/31 ,  G11B5/706 ,  G11B5/02 ,  G11B5/735 ,  G11B5/714

    Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 μm to 0.8 μm. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 μm to 0.50 μm, is 10 to 500 per area of 40 μm×40 μm.

    MAGNETIC RECORDING MEDIUM
    96.
    发明申请
    MAGNETIC RECORDING MEDIUM 有权

    公开(公告)号：US20220139423A1

    公开(公告)日：2022-05-05

    申请号：US17431096

    申请日：2020-02-14

    Applicant: Sony Group Corporation

    Inventor： Takashi KATAGUCHI ,  Masaru TERAKAWA ,  Takeshi TAKAHASHI ,  Natsuki ICHISE ,  Katsunori MAESHIMA

    IPC: G11B5/714 ,  G11B5/706

    Abstract: [Solving Means] A tape-shaped magnetic recording medium includes: a base; and a magnetic layer that is provided on the base and includes a magnetic powder. The magnetic powder includes magnetic particles that have a uniaxial crystal magnetic anisotropy and contain cobalt ferrite. A ratio L4/L2 of a component L4 having a multiaxial crystal magnetic anisotropy to a component L2 having a uniaxial crystal magnetic anisotropy is 0 or more and 0.25 or less, the components being obtained by applying Fourier transformation to a torque waveform of the magnetic recording medium.

    Magnetic recording cartridge
    98.
    发明授权
    Magnetic recording cartridge 有权

    公开(公告)号：US11250884B2

    公开(公告)日：2022-02-15

    申请号：US17234187

    申请日：2021-04-19

    Applicant: Sony Group Corporation

    Inventor： Minoru Yamaga ,  Noboru Sekiguchi

    IPC: G11B5/584 ,  G11B23/107 ,  G11B5/714 ,  G11B5/73 ,  G11B5/706 ,  G11B5/66 ,  G11B5/716 ,  G11B5/78

    Abstract: A magnetic recording cartridge is provided and including a magnetic recording medium, wherein an average thickness of the magnetic recording medium tT is 3.5 μm≤tT≤5.6 μm, a dimensional change amount Δw in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N≤Δw≤20000 ppm, the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and (a servo track width on an inner side of winding of the magnetic recording medium)−(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied, and a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more.

    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    100.
    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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