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公开(公告)号：US20230110514A1
公开(公告)日：2023-04-13
申请号：US17953953
申请日：2022-09-27
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
摘要： A magnetic tape in which a tape thickness of the magnetic tape is 5.2 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：US20220358961A1
公开(公告)日：2022-11-10
申请号：US17730763
申请日：2022-04-27
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Yusuke Kaneko
IPC分类号： G11B5/592 , G11B5/78 , G11B5/706 , G11B5/735 , G11B23/107
摘要： In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in an environment of a temperature of 32° C. and relative humidity of 55% and a servo band spacing obtained after storage in the environment for a storage time T is set to A, and T is defined as 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours, a medium life calculated by a linear function of A and a logarithm logeT of T, that are derived from a value of A and a value of the logarithm logeT of T obtained for each T is 3 years or longer. The medium life is T in a case where the A satisfies Equation 1: A=1.5−B.
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公开(公告)号：US20220013146A1
公开(公告)日：2022-01-13
申请号：US17366039
申请日：2021-07-02
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Yusuke KAGAWA
摘要： The magnetic tape cartridge includes a magnetic tape, and a cartridge reel. In the magnetic tape, a minimum winding deviation occurrence load measured after the magnetic tape is rewound around the cartridge reel by applying a tension of 0.40 N in a longitudinal direction of the magnetic tape is 300 N or less.
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公开(公告)号：US20210375318A1
公开(公告)日：2021-12-02
申请号：US17331651
申请日：2021-05-27
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
摘要： A magnetic tape device, in which a 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 of the magnetic tape 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 caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and a curvature of the magnetic tape in the longitudinal direction is 4 mm/m or less.
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公开(公告)号：US20210375315A1
公开(公告)日：2021-12-02
申请号：US17331649
申请日：2021-05-27
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
IPC分类号： G11B15/093 , G11B5/008
摘要： A magnetic tape device, in which a 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 of the magnetic tape 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 caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and an adhesive strength of the magnetic layer of the magnetic tape is 1.0 N or more, and an adhesive strength of the back coating layer is 1.0 N or more.
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公开(公告)号：US20210375307A1
公开(公告)日：2021-12-02
申请号：US17333019
申请日：2021-05-28
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
IPC分类号： G11B5/008
摘要： A magnetic tape device, in which a 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 of the magnetic tape and a maximum value of the tension is 0.50 N or more, the magnetic tape after running in a state where the tension is applied is caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a number distribution A of equivalent circle diameters of a plurality of bright areas and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer of the magnetic tape with a scanning electron microscope satisfy predetermined number distributions, respectively.w
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公开(公告)号：US20210287711A1
公开(公告)日：2021-09-16
申请号：US17199669
申请日：2021-03-12
申请人： FUJIFILM Corporation
发明人： Takashi FUJIMOTO , Norihito KASADA , Eiki OZAWA
IPC分类号： G11B5/706
摘要： The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder, in which the ferromagnetic powder is ε-iron oxide powder, and a coefficient of variation of particle size of the ε-iron oxide powder in a longitudinal direction of the magnetic layer is 0.50% or more and 5.00% or less.
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公开(公告)号：US20210280212A1
公开(公告)日：2021-09-09
申请号：US17328620
申请日：2021-05-24
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
IPC分类号： G11B5/735 , G11B23/107 , G11B5/706 , G11B5/596 , G11B5/70
摘要： Provided are a magnetic tape including: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer has a servo pattern, a center line average surface roughness Ra measured on a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an absolute value ΔN of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 to 0.40, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
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公开(公告)号：US20210233563A1
公开(公告)日：2021-07-29
申请号：US17155536
申请日：2021-01-22
申请人： FUJIFILM Corporation
发明人： Atsushi MUSHA , So MATSUYAMA , Norihito KASADA
摘要： In the magnetic recording and reproducing device, a distal end width of the first magnetic pole in the recording element is substantially the same as a distal end width of the second magnetic pole; the reproducing element width of the reproducing element is equal to or less than 0.8 μm; and in the magnetic recording medium, a number distribution A of equivalent circle diameters of a plurality of bright areas 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, and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV satisfy predetermined number distribution, respectively. w
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公开(公告)号：US20210233561A1
公开(公告)日：2021-07-29
申请号：US17155738
申请日：2021-01-22
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
摘要： In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.
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