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公开(公告)号：US11355142B2
公开(公告)日：2022-06-07
申请号：US16777418
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC: G11B5/584 , G01B11/06 , G11B5/708 , G11B5/70 , G11B5/702 , G11B5/706 , G11B5/78 , G11B20/10 , G11B23/50 , G11B27/022 , G11B5/00 , B82Y10/00 , B82Y25/00
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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162.发明授权公开(公告)号：US11302357B2
公开(公告)日：2022-04-12
申请号：US17025092
申请日：2020-09-18
Applicant: FUJIFILM Corporation
Inventor： Naoki Sano , Takuto Kurokawa , Eiki Ozawa , Norihito Kasada , Megumi Nakano
Abstract: The magnetic recording medium includes: a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which a difference between a spacing measured on a surface of the back coating layer by optical interferometry under a pressure of 0.5 atm after n-hexane cleaning and a spacing measured on the surface of the back coating layer by optical interferometry under a pressure of 13.5 atm after n-hexane cleaning is 12 nm or more.
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公开(公告)号：US11289124B2
公开(公告)日：2022-03-29
申请号：US17167589
申请日：2021-02-04
Applicant: FUJIFILM Corporation
Inventor： Yusuke Kaneko , Yuto Murata , Norihito Kasada
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 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 wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a center line average roughness Ra measured regarding a surface of a back coating layer of the magnetic tape with an atomic force microscope is in a range of 5 to 13 nm.
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164.发明授权公开(公告)号：US11270727B2
公开(公告)日：2022-03-08
申请号：US16825534
申请日：2020-03-20
Applicant: FUJIFILM Corporation
Inventor： Yuto Murata , Norihito Kasada , Yusuke Kagawa
Abstract: In the magnetic tape cartridge, a tape has a tape thickness of 5.3 μm or less, and a difference Winner−Wouter between a tape width Winner at a position of 50 m±1 m from a tape inner end and a tape width Wouter at a position of 50 m±1 m from a tape outer end is 4.1 μm to 19.9 μm as a value measured on 100th day from a date of magnetic tape cartridge manufacture, and a difference Ginner−Gouter between a servo band interval Ginner in a range of 49 m to 51 m from the tape inner end and a servo band interval Gouter in a range of 49 m to 51 m from the tape outer end is −3.9 μm to 0.0 μm as a value measured on 100th day from the date of magnetic tape cartridge manufacture.
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公开(公告)号：US20220005504A1
公开(公告)日：2022-01-06
申请号：US17477087
申请日：2021-09-16
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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Patent Agency Ranking
166.发明授权公开(公告)号：US11145325B2
公开(公告)日：2021-10-12
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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167.发明申请公开(公告)号：US20210287710A1
公开(公告)日：2021-09-16
申请号：US17199578
申请日：2021-03-12
Applicant: FUJIFILM Corporation
Inventor： Takashi Fujimoto , Norihito Kasada , Eiki Ozawa
Abstract: 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 aspect ratio of the ε-iron oxide powder in a longitudinal direction of the magnetic layer is 0.20% or more and 8.00% or less.
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168.发明申请公开(公告)号：US20210287706A1
公开(公告)日：2021-09-16
申请号：US17196076
申请日：2021-03-09
Applicant: FUJIFILM Corporation
Inventor： Megumi Nakano , Eiki Ozawa , Norihito Kasada
Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder in which the ferromagnetic powder is ε-iron oxide powder, and a coefficient of friction measured on a base part of a surface of the magnetic layer after pressing the magnetic layer at a pressure of 90 atm is 0.35 or less.
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169.发明授权公开(公告)号：US10978105B2
公开(公告)日：2021-04-13
申请号：US16143747
申请日：2018-09-27
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: Provided are a magnetic recording medium, in which a magnetic layer includes a ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110)/Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic recording medium is 0.65 to 1.00, a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 50.0° to 55.0°, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
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公开(公告)号：US20200342903A1
公开(公告)日：2020-10-29
申请号：US16857502
申请日：2020-04-24
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference Safter−Sbefore between a spacing Safter measured on a surface of the magnetic layer by optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by optical interferometry before methyl-ethyl-ketone cleaning is more than 0 nm and 15.0 nm or less, and the non-magnetic support is an aromatic polyamide support having a moisture absorption of 2.2% or less.
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