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    MAGNETIC TAPE AND MAGNETIC TAPE DEVICE
    31.
    发明申请
    MAGNETIC TAPE AND MAGNETIC TAPE DEVICE 审中-公开

    公开(公告)号：US20170372742A1

    公开(公告)日：2017-12-28

    申请号：US15626355

    申请日：2017-06-19

    Applicant: FUJIFILM Corporation

    Inventor： Tetsuya KANEKO ,  Norihito KASADA ,  Eiki OZAWA

    IPC: G11B5/78 ,  G11B5/584 ,  G11B5/70 ,  G11B5/73

    CPC classification number: G11B5/78 ,  G11B5/584 ,  G11B5/70 ,  G11B5/7013 ,  G11B5/70678 ,  G11B5/708 ,  G11B5/7085 ,  G11B5/7305

    Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos η of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.

    MAGNETIC TAPE
    32.
    发明申请
    MAGNETIC TAPE 审中-公开

    公开(公告)号：US20170372741A1

    公开(公告)日：2017-12-28

    申请号：US15625428

    申请日：2017-06-16

    Applicant: FUJIFILM Corporation

    Inventor： Takuto KUROKAWA ,  Eiki OZAWA ,  Norihito KASADA

    IPC: G11B5/78 ,  G11B5/725 ,  G11B5/712

    CPC classification number: G11B5/735 ,  G11B5/712 ,  G11B5/725 ,  G11B5/78

    Abstract: Provided is a magnetic tape in which a thickness of a back coating layer is equal to or smaller than 0.20 μm, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the back coating layer at a photoelectron take-off angle of 10 degrees, is equal to or greater than 35 atom %, 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 respectively greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between a spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.

    MAGNETIC TAPE AND MAGNETIC TAPE DEVICE
    33.
    发明申请
    MAGNETIC TAPE AND MAGNETIC TAPE DEVICE 审中-公开

    公开(公告)号：US20170372727A1

    公开(公告)日：2017-12-28

    申请号：US15627696

    申请日：2017-06-20

    Applicant: FUJIFILM Corporation

    Inventor： Norihito KASADA ,  Tetsuya KANEKO ,  Eiki OZAWA

    IPC: G11B5/008 ,  G11B5/596 ,  G11B5/712

    Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

    MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME
    34.
    发明申请
    MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME 审中-公开

    公开(公告)号：US20170221517A1

    公开(公告)日：2017-08-03

    申请号：US15422944

    申请日：2017-02-02

    Applicant: FUJIFILM Corporation

    Inventor： Eiki OZAWA ,  Masahito OYANAGI ,  Norihito KASADA

    IPC: G11B5/735 ,  G11B5/84 ,  G11B5/733 ,  G11B5/78 ,  G11B5/70 ,  G11B5/73

    CPC classification number: G11B5/735 ,  G11B5/70 ,  G11B5/7305 ,  G11B5/733 ,  G11B5/78 ,  G11B5/8404 ,  G11B5/8412

    Abstract: The magnetic tape has a magnetic layer and a backcoat layer, wherein, each of the magnetic layer and backcoat layer contains a fatty acid ester, the Ra measured on the magnetic layer side surface is less than or equal to 2.8 nm, the difference between the spacing measured by optical interferometry on the magnetic layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm, the FWHMbefore on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm, the FWHMafter on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm; and the difference between the spacing measured on the backcoat layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm.

    RECORDING DEVICE, READING DEVICE, RECORDING METHOD, RECORDING PROGRAM, READING METHOD, READING PROGRAM, AND MAGNETIC TAPE
    35.
    发明申请
    RECORDING DEVICE, READING DEVICE, RECORDING METHOD, RECORDING PROGRAM, READING METHOD, READING PROGRAM, AND MAGNETIC TAPE 有权

    公开(公告)号：US20210383826A1

    公开(公告)日：2021-12-09

    申请号：US17393404

    申请日：2021-08-04

    Applicant: FUJIFILM CORPORATION

    Inventor： Eiki OZAWA ,  Michitaka KONDO ,  Kentaro MIYAMOTO ,  Naoki SANO

    IPC: G11B5/008 ,  G11B5/708 ,  G11B5/71 ,  G11B5/735 ,  G11B5/78

    Abstract: An information processing device includes a generation unit that generates a hierarchy of a group that classifies each piece of data from information about each of a plurality of pieces of data to be recorded, and a control unit that controls recording of the plurality of pieces of data included in a group of the hierarchy at a highest level on a magnetic recording medium in a recording order according to an order from an upper hierarchy to a lower hierarchy, for each group of the hierarchy at the highest level. The magnetic recording medium has a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support. A difference between spacings S0.5 and S13.5 measured under pressures of 0.5 atm and 13.5 atm by an optical interference method after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 3.0 nm.

    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    40.
    发明申请
    MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS 审中-公开

    公开(公告)号：US20200251138A1

    公开(公告)日：2020-08-06

    申请号：US16777368

    申请日：2020-01-30

    Applicant: FUJIFILM Corporation

    Inventor： Eiki OZAWA ,  Norihito KASADA ,  Atsushi MUSHA

    IPC: G11B5/70 ,  G11B5/008

    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and in which a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.

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