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11.发明授权公开(公告)号：US11094343B2
公开(公告)日：2021-08-17
申请号：US16361597
申请日：2019-03-22
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
摘要： 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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公开(公告)号：US11087793B2
公开(公告)日：2021-08-10
申请号：US16727181
申请日：2019-12-26
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
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：US11087787B2
公开(公告)日：2021-08-10
申请号：US16777411
申请日：2020-01-30
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC分类号： G11B5/58 , G11B5/584 , G11B5/706 , G11B5/708 , G11B5/702 , G11B5/70 , G11B20/10 , G11B5/78 , G11B27/022 , G11B5/00 , B82Y25/00 , B82Y10/00
摘要： 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 L99.9−L0.1 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 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 or more and 0.40 or less.
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公开(公告)号：US20210241787A1
公开(公告)日：2021-08-05
申请号：US17160977
申请日：2021-01-28
申请人： FUJIFILM Corporation
发明人： Yuto MURATA , Yusuke Kaneko , Norihito Kasada
摘要： The magnetic tape satisfies TDSage+TDSenv−TC≤0.30 μm. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by ½, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.
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15.发明授权公开(公告)号：US10902874B2
公开(公告)日：2021-01-26
申请号：US16522867
申请日：2019-07-26
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
摘要： 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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公开(公告)号：US20200251136A1
公开(公告)日：2020-08-06
申请号：US16777418
申请日：2020-01-30
申请人： FUJIFILM Corporation
发明人： Eiki OZAWA , Norihito Kasada , Atsushi Musha
IPC分类号： G11B5/584 , G11B23/50 , G11B5/70 , G11B27/022 , G11B5/706 , G11B20/10 , G11B5/708 , G01B11/06 , G11B5/78 , G11B5/702 , G11B5/00 , B82Y10/00 , B82Y25/00
摘要： 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. w
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公开(公告)号：US20200251135A1
公开(公告)日：2020-08-06
申请号：US16777411
申请日：2020-01-30
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC分类号： G11B5/584 , G11B20/10 , G11B5/702 , G11B5/70 , G11B5/706 , G11B27/022 , G11B5/78 , G11B5/708 , B82Y10/00 , G11B5/00 , B82Y25/00
摘要： 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 L99.9−L0.1 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 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 or more and 0.40 or less.
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公开(公告)号：US10714139B2
公开(公告)日：2020-07-14
申请号：US16037564
申请日：2018-07-17
申请人： FUJIFILM Corporation
发明人： Takuto Kurokawa , Norihito Kasada , Toshio Tada , Eiki Ozawa
摘要： The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.
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公开(公告)号：US10573341B2
公开(公告)日：2020-02-25
申请号：US15388911
申请日：2016-12-22
申请人： FUJIFILM Corporation
发明人： Toshio Tada , Norihito Kasada , Masahito Oyanagi
摘要： The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: ΔSFD=SFD25° C.−SFD−190° C., ranges from 0.50 to 1.60.
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公开(公告)号：US10546605B2
公开(公告)日：2020-01-28
申请号：US15920518
申请日：2018-03-14
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada
摘要： The magnetic tape device includes a magnetic tape and a TMR head (servo head), in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.
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