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公开(公告)号：US12300287B2
公开(公告)日：2025-05-13
申请号：US18422850
申请日：2024-01-25
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: Provided is a magnetic tape, in which, in an environment of a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on a magnetic layer surface with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf or more and 15 gf or less, and standard deviation of a frictional force F on the magnetic layer surface with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
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公开(公告)号：US12272390B2
公开(公告)日：2025-04-08
申请号：US18170683
申请日：2023-02-17
Applicant: FUJIFILM Corporation
Inventor： Toru Nakao , Norihito Kasada , Tetsuya Kaneko , Atsushi Musha
IPC: G11B5/58 , G11B5/584 , G11B15/43 , G11B23/027
Abstract: A magnetic tape cartridge includes a case in which a magnetic tape is accommodated and a storage medium provided in the case. At least one of reading or writing of data is performed by a plurality of magnetic elements, which are linearly disposed, with respect to the magnetic tape pulled out from the case. A disposition direction of the plurality of magnetic elements is tilted toward an entire length direction side of the magnetic tape with respect to a width direction of the magnetic tape. The storage medium stores tilt feature information indicating a feature of tilt of the disposition direction with respect to the width direction.
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公开(公告)号：US11887637B2
公开(公告)日：2024-01-30
申请号：US17955251
申请日：2022-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
CPC classification number: G11B5/7028 , G11B5/708 , G11B5/71 , G11B5/7356 , G11B5/78
Abstract: A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, 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：US11869553B2
公开(公告)日：2024-01-09
申请号：US17955156
申请日：2022-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
CPC classification number: G11B5/5928 , G11B5/70615 , G11B5/70678 , G11B5/7356
Abstract: A magnetic tape in which an arithmetic average roughness Ra measured at a surface of the magnetic layer with an atomic force microscope is 2.0 nm 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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公开(公告)号：US11810603B2
公开(公告)日：2023-11-07
申请号：US17822803
申请日：2022-08-29
Applicant: FUJIFILM CORPORATION
Inventor： Junichi Nakamigawa , Yasushi Komori , Yusuke Kaneko , Tadashi Kira , Norihito Kasada , Toru Nakao
CPC classification number: G11B5/584 , G11B5/00817
Abstract: A magnetic tape cartridge includes a case that accommodates a magnetic tape on which a plurality of servo bands and a plurality of data bands are formed, servo patterns being recorded in the servo bands, and a memory provided in the case. The memory stores servo pattern interval-related information related to a servo pattern interval determined for each of the plurality of data bands included in the magnetic tape. The servo pattern interval is commonly used for a plurality of division areas obtained by dividing the data band in a width direction of the magnetic tape, and is a representative interval between a first servo pattern and a second servo pattern.
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Patent Agency Ranking
公开(公告)号：US20230245680A1
公开(公告)日：2023-08-03
申请号：US18163614
申请日：2023-02-02
Applicant: FUJIFILM Corporation
Inventor： Megumi NAKANO , Norihito Kasada
IPC: G11B5/735
CPC classification number: G11B5/735
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. The number of recesses having an equivalent circle diameter of 0.30 μm to 0.60 μm existing on a surface of the magnetic layer is 10 to 600 per 40 μm×40 μm area, and a standard deviation σ of the number of recesses in a width direction on the surface of the magnetic layer is 100 or less.
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7.发明授权公开(公告)号：US11581015B2
公开(公告)日：2023-02-14
申请号：US17386616
申请日：2021-07-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.
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8.发明授权公开(公告)号：US11551716B2
公开(公告)日：2023-01-10
申请号：US17368274
申请日：2021-07-06
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050.
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公开(公告)号：US11514944B2
公开(公告)日：2022-11-29
申请号：US16361814
申请日：2019-03-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: 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, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, 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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10.发明授权公开(公告)号：US11423933B2
公开(公告)日：2022-08-23
申请号：US17022886
申请日：2020-09-16
Applicant: FUJIFILM Corporation
Inventor： Megumi Nakano , Eiki Ozawa , Norihito Kasada
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which one or more kinds of component selected from the group consisting of a fatty acid and a fatty acid amide are included in a portion of the magnetic layer side on the non-magnetic support, and a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees, after pressing the magnetic layer at a pressure of 70 atm is 45 atom % or more.
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