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21.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
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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公开(公告)号：US20200251136A1
公开(公告)日：2020-08-06
申请号：US16777418
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito Kasada , Atsushi Musha
IPC: 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
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. 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
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC: G11B5/584 , G11B20/10 , G11B5/702 , G11B5/70 , G11B5/706 , G11B27/022 , G11B5/78 , G11B5/708 , B82Y10/00 , G11B5/00 , 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 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
Applicant: FUJIFILM Corporation
Inventor： Takuto Kurokawa , Norihito Kasada , Toshio Tada , Eiki Ozawa
Abstract: 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
Applicant: FUJIFILM Corporation
Inventor： Toshio Tada , Norihito Kasada , Masahito Oyanagi
Abstract: 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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Patent Agency Ranking
公开(公告)号：US10546605B2
公开(公告)日：2020-01-28
申请号：US15920518
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: 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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公开(公告)号：US10510369B2
公开(公告)日：2019-12-17
申请号：US15626355
申请日：2017-06-19
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
Abstract: A magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 μm. The magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the magnetic layer includes an abrasive. In addition, the tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00.
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公开(公告)号：US10431248B2
公开(公告)日：2019-10-01
申请号：US15614876
申请日：2017-06-06
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
Abstract: A magnetic tape includes a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The magnetic layer includes a timing-based servo pattern. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer, and the C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 45 atom %.
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公开(公告)号：US10410666B2
公开(公告)日：2019-09-10
申请号：US15920544
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa
Abstract: The magnetic tape device includes a magnetic tape including a magnetic layer; and a TMR head (reproducing head), in which an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity 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, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and 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 the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
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30.发明授权公开(公告)号：US10403319B2
公开(公告)日：2019-09-03
申请号：US15380309
申请日：2016-12-15
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder, abrasive, and binder on the nonmagnetic layer, wherein a thickness of the nonmagnetic layer is less than or equal to 0.50 μm, a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1, ΔSFD=SFD25° C.−SFD−190° C., is greater than or equal to 0.50, wherein, in Equation 1, SFD25° C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD−190° C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of −190° C.
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