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    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    1.
    发明申请
    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS 有权

    公开(公告)号：US20210201945A1

    公开(公告)日：2021-07-01

    申请号：US17130857

    申请日：2020-12-22

    Applicant: FUJIFILM Corporation

    Inventor： Norihito KASADA ,  Yuto Murata ,  Yusuke Kaneko

    IPC: G11B5/706 ,  G11B5/008 ,  G11B5/735 ,  G11B5/592 ,  G11B5/702

    Abstract: A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16° C. and a relative humidity of 20%, a temperature of 16° C. and a relative humidity of 80%, a temperature of 26° C. and a relative humidity of 80%, a temperature of 32° C. and a relative humidity of 20% and a temperature of 32° C. and a relative humidity of 55% is 1.43 μm/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 μm/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 μm/N/° C. or less.

    MAGNETIC TAPE AND MAGNETIC TAPE CONTAINER
    2.
    发明申请
    MAGNETIC TAPE AND MAGNETIC TAPE CONTAINER 有权

    公开(公告)号：US20220277769A1

    公开(公告)日：2022-09-01

    申请号：US17680866

    申请日：2022-02-25

    Applicant: FUJIFILM Corporation

    Inventor： Norihito Kasada ,  Yuto Murata

    IPC: G11B5/78

    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount Δw in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(σG/Δw)×100 is 10% or less. The σG is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.

    Magnetic tape with characterized servo bands, magnetic tape cartridge, and magnetic tape apparatus
    3.
    发明授权
    Magnetic tape with characterized servo bands, magnetic tape cartridge, and magnetic tape apparatus 有权

    公开(公告)号：US11270732B2

    公开(公告)日：2022-03-08

    申请号：US17161031

    申请日：2021-01-28

    Applicant: FUJIFILM Corporation

    Inventor： Yuto Murata ,  Yusuke Kaneko ,  Norihito Kasada

    IPC: G11B5/78 ,  G11B5/70 ,  G11B5/73 ,  G11B5/008 ,  G11B15/43 ,  G11B20/12 ,  G11B5/708 ,  G11B5/735 ,  G11B15/32

    Abstract: In the probability distribution calculated from TDSage, TDSenv, and TC, the magnetic tape has the probability Pfail of equal to or less than 0.2%, in which the absolute value of ΔSB exceeds 0.3 μm. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by ½, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.

    Single reel magnetic tape cartridge with pre-defined tape width difference
    4.
    发明授权
    Single reel magnetic tape cartridge with pre-defined tape width difference 有权

    公开(公告)号：US10902875B2

    公开(公告)日：2021-01-26

    申请号：US16849154

    申请日：2020-04-15

    Applicant: FUJIFILM Corporation

    Inventor： Yusuke Kagawa ,  Norihito Kasada ,  Yuto Murata

    IPC: G11B5/78 ,  G11B23/107 ,  G11B5/70 ,  G11B5/73 ,  G11B5/735

    Abstract: Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, a tape thickness is equal to or smaller than 5.2 μm, a tape width difference (B−A) between a tape width A at a position of 10 m±1 m from a tape outer end and a tape width B at a position of 50 m±1 m from a tape inner end is 2.4 μm to 12.0 μm, and the tape width A and the tape width B are values measured 100 days from the date of magnetic tape cartridge manufacture.

    Magnetic tape container
    6.
    发明授权
    Magnetic tape container 有权

    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.

    MAGNETIC TAPE CONTROL SYSTEM AND MAGNETIC TAPE CONTROL DEVICE
    7.
    发明公开
    MAGNETIC TAPE CONTROL SYSTEM AND MAGNETIC TAPE CONTROL DEVICE 审中-公开

    公开(公告)号：US20230178101A1

    公开(公告)日：2023-06-08

    申请号：US18161478

    申请日：2023-01-30

    Applicant: FUJIFILM Corporation

    Inventor： Yuto Murata

    IPC: G11B5/17 ,  G11B15/32

    CPC classification number: G11B5/17 ,  G11B15/32 ,  G11B2220/90

    Abstract: Provided are a magnetic tape control system that executes pre-rewinding storage of storing a magnetic tape in a state of being wound around a reel, and post-rewinding storage of storing the magnetic tape in a state of being rewound around a reel different from or the same reel as the reel after the pre-rewinding storage such that an end that is a tape outside end during the pre-rewinding storage is turned into a tape inside end and an end that is a tape inside end during the pre-rewinding storage is turned into a tape outside end, and a magnetic tape control device including a rewinding control unit that transmits rewinding execution information, and a drive unit that receives the rewinding execution information and starts running of a magnetic tape stored in a state of being wound around a reel to execute rewinding of the magnetic tape.

    MAGNETIC TAPE CARTRIDGE AND MAGNETIC TAPE DEVICE
    8.
    发明申请
    MAGNETIC TAPE CARTRIDGE AND MAGNETIC TAPE DEVICE 审中-公开

    公开(公告)号：US20200302963A1

    公开(公告)日：2020-09-24

    申请号：US16825360

    申请日：2020-03-20

    Applicant: FUJIFILM Corporation

    Inventor： Yuto Murata ,  Norihito Kasada ,  Yusuke Kagawa

    IPC: G11B5/735 ,  G11B5/712

    Abstract: Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support and a magnetic layer containing a ferromagnetic powder, and has a tape thickness of 5.3 μm or less, the magnetic layer includes a plurality of servo bands, and a difference (Ginner−Gouter) between a servo band interval Ginner in a range of 49 m to 51 m from a tape inner end and a servo band interval Gouter in a range of 49 m to 51 m from a tape outer end is −3.9 μm to 1.1 μm as a value measured on 100th day from a date of magnetic tape cartridge manufacture.

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