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    MAGNETIC RECORDING MEDIUM
    4.
    发明申请
    MAGNETIC RECORDING MEDIUM 审中-公开
    磁记录介质

    公开(公告)号：US20160064025A1

    公开(公告)日：2016-03-03

    申请号：US14838663

    申请日：2015-08-28

    Applicant: FUJIFILM CORPORATION

    Inventor： Takuto KUROKAWA ,  Kazutoshi KATAYAMA

    IPC: G11B5/71

    CPC classification number: G11B5/71

    Abstract: The magnetic recording medium comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein the magnetic layer comprises a lubricant and a 1-bromonaphthalene contact angle adjusting agent that is capable of adjusting a contact angle for 1-bromonaphthalene, the contact angle for 1-bromonaphthalene being measured on a surface of the magnetic layer, and the contact angle measured on the surface of the magnetic layer ranges from 45.0° to 55.0° for 1-bromonaphthalene, and ranges from 90.0° to 100.0° for water.

    Abstract translation: 磁记录介质包括在非磁性载体上包含非磁性粉末和粘合剂的非磁性层，以及在非磁性层上包含铁磁性粉末和粘合剂的磁性层，其中磁性层包含润滑剂和能够使用的1-溴萘接触角调节剂 调整1-溴萘的接触角时，在磁性层的表面上测定了1-溴萘的接触角，对于1-溴萘，在磁性层的表面测定的接触角为45.0〜55.0° ，水的范围为90.0°〜100.0°。

    MAGNETIC TAPE, MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE
    7.
    发明申请
    MAGNETIC TAPE, MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING DEVICE 审中-公开

    公开(公告)号：US20190304488A1

    公开(公告)日：2019-10-03

    申请号：US16368044

    申请日：2019-03-28

    Applicant: FUJIFILM Corporation

    Inventor： Eiki OZAWA ,  Takuto KUROKAWA

    IPC: G11B5/008 ,  G11B5/712 ,  G11B5/584

    Abstract: The magnetic tape includes a non-magnetic support; a magnetic layer including a ferromagnetic powder and a binding agent on one surface of the non-magnetic support; and a back coating layer including a non-magnetic powder and a binding agent on the other surface of the non-magnetic support, in which a center line average surface roughness Ra measured regarding a surface of the back coating layer is equal to or smaller than 7.0 nm, and a difference between a spacing Safter measured by optical interferometry regarding the surface of the back coating layer after methyl ethyl ketone cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the back coating layer before methyl ethyl ketone cleaning is greater than 0 nm and equal to or smaller than 30.0 nm.

    MAGNETIC TAPE
    8.
    发明申请
    MAGNETIC TAPE 审中-公开

    公开(公告)号：US20190027175A1

    公开(公告)日：2019-01-24

    申请号：US16038771

    申请日：2018-07-18

    Applicant: FUJIFILM Corporation

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

    IPC: G11B5/702 ,  G11B5/735 ,  G11B5/708 ,  G11B5/716

    Abstract: The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, a center line average surface roughness measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity 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, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the back coating layer is 15.0° to 30.0°.

    MAGNETIC RECORDING AND REPRODUCING DEVICE
    10.
    发明申请
    MAGNETIC RECORDING AND REPRODUCING DEVICE 有权

    公开(公告)号：US20210383827A1

    公开(公告)日：2021-12-09

    申请号：US17338694

    申请日：2021-06-04

    Applicant: FUJIFILM Corporation

    Inventor： So MATSUYAMA ,  Norihito KASADA ,  Takuto KUROKAWA

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

    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 0.2 μm or greater and less than 0.5 μm. In the magnetic recording medium, the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 μm or greater and less than 0.20 μm, is 100 to 2,000 per area of 40 μm×40 μm.

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