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    Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    4.
    发明授权
    Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus 有权

    公开(公告)号：US11355146B2

    公开(公告)日：2022-06-07

    申请号：US16777368

    申请日：2020-01-30

    申请人： FUJIFILM Corporation

    发明人： Eiki Ozawa ,  Norihito Kasada ,  Atsushi Musha

    IPC分类号： G11B5/70 ,  G11B5/008

    摘要： 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.

    Magnetic recording medium having characterized magnetic layer
    7.
    发明授权
    Magnetic recording medium having characterized magnetic layer 有权

    公开(公告)号：US10714139B2

    公开(公告)日：2020-07-14

    申请号：US16037564

    申请日：2018-07-17

    申请人： FUJIFILM Corporation

    发明人： Takuto Kurokawa ,  Norihito Kasada ,  Toshio Tada ,  Eiki Ozawa

    IPC分类号： G11B5/70 ,  G11B5/706 ,  G11B5/708

    摘要： 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°.

    Head tracking servo method for magnetic tape recording device
    8.
    发明授权
    Head tracking servo method for magnetic tape recording device 有权

    公开(公告)号：US10546605B2

    公开(公告)日：2020-01-28

    申请号：US15920518

    申请日：2018-03-14

    申请人： FUJIFILM Corporation

    发明人： Eiki Ozawa ,  Norihito Kasada

    IPC分类号： G11B5/712 ,  G11B5/706 ,  G11B5/008 ,  G11B5/70 ,  G11B5/78 ,  G11B5/584 ,  G11B5/39 ,  G11B5/592

    摘要： The magnetic tape device includes a magnetic tape and a TMR head (servo head), in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.

    Magnetic tape having characterized magnetic particles and magnetic tape device
    9.
    发明授权
    Magnetic tape having characterized magnetic particles and magnetic tape device 有权

    公开(公告)号：US10510369B2

    公开(公告)日：2019-12-17

    申请号：US15626355

    申请日：2017-06-19

    申请人： FUJIFILM Corporation

    发明人： Tetsuya Kaneko ,  Norihito Kasada ,  Eiki Ozawa

    IPC分类号： G11B5/78 ,  G11B5/584 ,  G11B5/70 ,  G11B5/73 ,  G11B5/706 ,  G11B5/708

    摘要： A 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. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 μm. The magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the magnetic layer includes an abrasive. In addition, the tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00.

    Magnetic tape having characterized magnetic layer and magnetic tape device
    10.
    发明授权
    Magnetic tape having characterized magnetic layer and magnetic tape device 有权

    公开(公告)号：US10431248B2

    公开(公告)日：2019-10-01

    申请号：US15614876

    申请日：2017-06-06

    申请人： FUJIFILM Corporation

    发明人： Norihito Kasada ,  Tetsuya Kaneko ,  Eiki Ozawa

    IPC分类号： G11B5/71 ,  G11B5/78 ,  G11B5/008 ,  G11B5/584

    摘要： A magnetic tape includes a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The magnetic layer includes a timing-based servo pattern. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer, and the C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 45 atom %.