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公开(公告)号：US11545177B2
公开(公告)日：2023-01-03
申请号：US17476565
申请日：2021-09-16
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Akinori Sugishima
IPC: G11B5/702
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8.
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公开(公告)号：US11514940B2
公开(公告)日：2022-11-29
申请号：US16569103
申请日：2019-09-12
Applicant: FUJIFILM Corporation
Inventor： Naoki Sano , Takuto Kurokawa , Norihito Kasada , Eiki Ozawa
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a difference (S0.5−S13.5) between a spacing S0.5 measured by optical interferometry regarding a surface of the magnetic layer under a pressing force of 0.5 atm after n-hexane cleaning and a spacing S13.5 measured by optical interferometry regarding the surface of the magnetic layer under a pressing force of 13.5 atm after n-hexane cleaning is equal to or smaller than 3.0 nm, and a magnetic recording and reproducing device including this magnetic recording medium.
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公开(公告)号：US11488628B2
公开(公告)日：2022-11-01
申请号：US16522806
申请日：2019-07-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes 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 smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.
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公开(公告)号：US11482250B2
公开(公告)日：2022-10-25
申请号：US17490008
申请日：2021-09-30
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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公开(公告)号：US11475915B2
公开(公告)日：2022-10-18
申请号：US16009461
申请日：2018-06-15
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on 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.
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Patent Agency Ranking
56.发明授权公开(公告)号：US11462242B2
公开(公告)日：2022-10-04
申请号：US17326458
申请日：2021-05-21
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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公开(公告)号：US11443766B2
公开(公告)日：2022-09-13
申请号：US16727181
申请日：2019-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: 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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58.发明授权公开(公告)号：US11361792B2
公开(公告)日：2022-06-14
申请号：US16361589
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 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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公开(公告)号：US20210375311A1
公开(公告)日：2021-12-02
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
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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60.发明申请公开(公告)号：US20210287712A1
公开(公告)日：2021-09-16
申请号：US17326458
申请日：2021-05-21
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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