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公开(公告)号：US20210257001A1
公开(公告)日：2021-08-19
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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公开(公告)号：US20210090602A1
公开(公告)日：2021-03-25
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：US20200279580A1
公开(公告)日：2020-09-03
申请号：US16802768
申请日：2020-02-27
Applicant: FUJIFILM Corporation
Inventor： Naoki SANO , Eiki OZAWA , Norihito KASADA , Takuto KUROKAWA
Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference (S0.5−S13.5) between a spacing S0.5 measured on a surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 0.5 atm and a spacing S13.5 measured on the surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 13.5 atm is 9.0 nm or more.
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公开(公告)号：US20200227081A1
公开(公告)日：2020-07-16
申请号：US16832788
申请日：2020-03-27
Applicant: FUJIFILM Corporation
Inventor： Hidemasa HOSODA , Takuto KUROKAWA , Norihito KASADA , Takahiro IWAMOTO
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 greater than 0.08 μm and 0.14 μm or smaller, 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：US20200035262A1
公开(公告)日：2020-01-30
申请号：US16522867
申请日：2019-07-26
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 coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
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Patent Agency Ranking
公开(公告)号：US20200005822A1
公开(公告)日：2020-01-02
申请号：US16456811
申请日：2019-06-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Atsushi MUSHA
Abstract: A magnetic tape apparatus, in which an intensity ratio of peak intensity of diffraction peak of (110) plane with respect to peak intensity of diffraction peak of (114) plane of a hexagonal ferrite crystal structure obtained by XRD analysis of the magnetic layer by In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, and an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
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公开(公告)号：US20200005818A1
公开(公告)日：2020-01-02
申请号：US16456970
申请日：2019-06-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki Ozawa , Atsushi Musha
Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which 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, 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, and an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
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公开(公告)号：US20190295589A1
公开(公告)日：2019-09-26
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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公开(公告)号：US20190103133A1
公开(公告)日：2019-04-04
申请号：US16144605
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, 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 is 0.65 to 1.00, one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide is contained in a magnetic layer side portion on the non-magnetic support, a C—H derived C concentration of the magnetic layer is 45 atom % to 65 atom %, 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：US20190103130A1
公开(公告)日：2019-04-04
申请号：US16143646
申请日：2018-09-27
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/00813 , G11B5/39 , G11B5/48 , G11B5/70678 , G11B5/735 , G11B5/8404 , G11B15/473 , G11B2220/90
Abstract: Provided are a magnetic tape, in which a magnetic layer includes a ferromagnetic powder, a binding agent, and an oxide abrasive, ΔSFD in a longitudinal direction of the magnetic tape calculated by Expression 1, ΔSFD=SFD25° C.−SFD−190° C., is equal to or smaller than 0.50, 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, 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 tape.
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