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公开(公告)号：US11735218B2
公开(公告)日：2023-08-22
申请号：US17680866
申请日：2022-02-25
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yuto Murata
CPC classification number: G11B5/78 , G11B23/042
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount Δw in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(σG/Δw)×100 is 10% or less. The σG is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.
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公开(公告)号：US11538494B2
公开(公告)日：2022-12-27
申请号：US17155536
申请日：2021-01-22
Applicant: FUJIFILM Corporation
Inventor： Atsushi Musha , So Matsuyama , Norihito Kasada
Abstract: 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.
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公开(公告)号：US11437065B2
公开(公告)日：2022-09-06
申请号：US17022919
申请日：2020-09-16
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or less than 3.8.
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公开(公告)号：US11430478B2
公开(公告)日：2022-08-30
申请号：US16727205
申请日：2019-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: Provided are a magnetic tape including: a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or greater than 4.5, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.
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105.发明授权公开(公告)号：US11423934B2
公开(公告)日：2022-08-23
申请号：US16831158
申请日：2020-03-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and ε-iron oxide powder, and an amount of an edge weave of a tape edge on at least one side of the magnetic tape is 1.5 μm or less.
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Patent Agency Ranking
公开(公告)号：US11423932B2
公开(公告)日：2022-08-23
申请号：US17399241
申请日：2021-08-11
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC: G11B5/584 , G11B5/706 , G11B5/702 , G11B5/70 , G11B5/708 , G11B20/10 , G11B23/50 , G11B5/78 , G11B27/022 , G01B11/06 , G11B5/00 , B82Y25/00 , B82Y10/00
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer in which the magnetic layer has a timing-based servo pattern, 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 a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before methyl-ethyl-ketone cleaning is greater than 0 nm and 15.0 nm or less.
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公开(公告)号：US20220254373A1
公开(公告)日：2022-08-11
申请号：US17666851
申请日：2022-02-08
Applicant: FUJIFILM Corporation
Inventor： Takuto Kurokawa , So Matsuyama , Norihito Kasada
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A rate of change in friction coefficient on an LTO8 head measured on a surface of the magnetic layer before and after storage of the magnetic tape is 0.7 or more.
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公开(公告)号：US11410696B2
公开(公告)日：2022-08-09
申请号：US17154002
申请日：2021-01-21
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: 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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109.发明授权公开(公告)号：US11373680B2
公开(公告)日：2022-06-28
申请号：US16832284
申请日：2020-03-27
Applicant: FUJIFILM Corporation
Inventor： Takahiro Iwamoto , Hidemasa Hosoda , Norihito Kasada , Takuto Kurokawa
Abstract: Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.
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110.发明授权公开(公告)号：US11361793B2
公开(公告)日：2022-06-14
申请号：US16361597
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 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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