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公开(公告)号：US09601146B2
公开(公告)日：2017-03-21
申请号：US14753227
申请日：2015-06-29
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Masahito Oyanagi , Toshio Tada
Abstract: An aspect of the present invention relates to a magnetic tape comprising a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1 ranges from 0.35 to 1.50: ΔSFD=SFD25° C.−SFD−190° C. Equation 1 wherein, in Equation 1, SFD25° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD−190° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of −190° C.
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公开(公告)号：US12249360B2
公开(公告)日：2025-03-11
申请号：US18538907
申请日：2023-12-13
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. The ferromagnetic powder is a hexagonal ferrite powder, tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.
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公开(公告)号：US12217777B2
公开(公告)日：2025-02-04
申请号：US17730687
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yusuke Kaneko
Abstract: In the magnetic tape, a magnetic tape deformation amount after storage for 3 months each in a predetermined environment is 0.50 μm or less, a rate of a change in the magnetic tape deformation amount with respect to a change in relative humidity is 0.0001 μm/% to 0.0500 μm/%, and a rate of a change in magnetic tape deformation amount with respect to a change in temperature is 0.0010 μm/° C. to 0.1000 μm/° C.
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144.发明授权公开(公告)号：US11887636B2
公开(公告)日：2024-01-30
申请号：US18298730
申请日：2023-04-11
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yuto Murata , Nagisa Yamasaki
CPC classification number: G11B5/70 , G11B5/00813 , G11B5/00826 , G11B5/4893 , G11B5/00856 , G11B5/7356 , G11B2220/90 , G11B2220/956
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
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145.发明授权公开(公告)号：US11869557B2
公开(公告)日：2024-01-09
申请号：US17955045
申请日：2022-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
CPC classification number: G11B5/7085 , G11B5/7356
Abstract: A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 μm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
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Patent Agency Ranking
公开(公告)号：US11735213B2
公开(公告)日：2023-08-22
申请号：US17872566
申请日：2022-07-25
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Atsushi Musha
CPC classification number: G11B5/5926 , G11B5/00813 , G11B5/739
Abstract: A magnetic tape device. The angle θ formed by the axis of the element array of the magnetic head with respect to a width direction of the magnetic tape is changed during running of the magnetic tape in the magnetic tape device. The magnetic tape satisfies Equation 1: TDSage+TDSenv−TC≤0.10 μm. In Equation 1, the TDSage is a maximum value of an absolute value of a difference between a servo band spacing obtained before storage for 24 hours in a predetermined environment and a servo band spacing obtained after the storage. TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of servo band spacings obtained in each of five predetermined environments by ½, and TC is a value calculated by TC=L{cos (θinitial−Δθ)−cos (θinitial+Δθ)}.
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147.发明授权公开(公告)号：US11705159B2
公开(公告)日：2023-07-18
申请号：US17591593
申请日：2022-02-02
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke Kaneko , Toru Nakao , Atsushi Musha , Norihito Kasada
CPC classification number: G11B23/042 , G11B15/06 , G11B15/43
Abstract: A magnetic tape cartridge includes a case in which a magnetic tape is housed, and an NVM of a cartridge memory provided in the case. The NVM stores cartridge information including an identification ID regarding an allowable range of temperature/humidity in using the magnetic tape, an upper limit of a preservation period of the magnetic tape, and an upper limit of a use frequency of the magnetic tape.
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公开(公告)号：US11651792B2
公开(公告)日：2023-05-16
申请号：US17645699
申请日：2021-12-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
IPC: G11B15/43 , G11B15/093 , G11B5/78 , G11B5/008
CPC classification number: G11B15/093 , G11B5/00813 , G11B5/78
Abstract: A magnetic tape device; a magnetic tape; and a magnetic tape cartridge, in which the magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction and a maximum value of the tension is 0.50 N or more, and the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and the number of recesses having an equivalent circle diameter of 0.20 μm to 0.50 μm existing on a surface of the magnetic layer of the magnetic tape is 10 to 500 per 40 μm×40 μm area.
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公开(公告)号：US20230123823A1
公开(公告)日：2023-04-20
申请号：US17954808
申请日：2022-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 µm or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.
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公开(公告)号：US11514943B2
公开(公告)日：2022-11-29
申请号：US16361797
申请日：2019-03-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.
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