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公开(公告)号：US20170358318A1
公开(公告)日：2017-12-14
申请号：US15614876
申请日：2017-06-06
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
CPC classification number: G11B5/71 , G11B5/00813 , G11B5/584 , G11B5/70 , G11B5/78
Abstract: The 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, in which the magnetic layer includes 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, one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, 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 equal to or greater than 45 atom %.
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公开(公告)号：US20170278540A1
公开(公告)日：2017-09-28
申请号：US15466143
申请日：2017-03-22
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
CPC classification number: G11B20/1201 , G11B5/00813 , G11B5/584
Abstract: The magnetic tape has a timing base servo pattern on the magnetic layer, wherein the centerline average surface roughness Ra on the surface of the magnetic layer is less than or equal to 1.8 nm, the magnetic layer contains a fatty acid ester, the full width at half maximum of spacing distribution measured by optical interferometry on the surface of the magnetic layer before and after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 7.0 nm, the difference of spacing measured by optical interferometry on the surface of the magnetic layer after and before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 8.0 nm.
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公开(公告)号：US20170249964A1
公开(公告)日：2017-08-31
申请号：US15442961
申请日：2017-02-27
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Takuto KUROKAWA , Masahito OYANAGI
CPC classification number: G11B5/7305 , G11B5/702 , G11B5/706 , G11B5/71 , G11B5/725 , G11B5/733 , G11B5/735 , G11B5/78
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.
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公开(公告)号：US20170186456A1
公开(公告)日：2017-06-29
申请号：US15388911
申请日：2016-12-22
Applicant: FUJIFILM Corporation
Inventor： Toshio TADA , Norihito KASADA , Masahito OYANAGI
CPC classification number: G11B5/714 , G11B5/7013 , G11B5/70678 , G11B5/708 , G11B5/712 , G11B5/78 , G11B5/845
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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公开(公告)号：US20240321301A1
公开(公告)日：2024-09-26
申请号：US18678272
申请日：2024-05-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/588 , G11B5/00817
Abstract: Provided is a magnetic tape apparatus. During running of a magnetic tape in the magnetic tape apparatus, an angle θ formed by an axis of an element array of a magnetic head with respect to a width direction of the magnetic tape is changed. The magnetic tape satisfies Expression 1, the Equation 1: TDSage+TDSenv−TC≤0.10 μm. In Expression 1, TDSage is a maximum value of an absolute value of a difference between a servo band interval obtained before storage and a servo band interval obtained after the storage in a predetermined environment for 36 hours. TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value in the servo band intervals obtained in each of predetermined five environments by ½, and TC is a value calculated by TC=L{cos(θinitial−Δθ)−cos(θinitial+Δθ)}.
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Patent Agency Ranking
公开(公告)号：US20240212709A1
公开(公告)日：2024-06-27
申请号：US18538907
申请日：2023-12-13
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/658 , G11B5/7356 , G11B5/736 , G11B5/78
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. The ferromagnetic powder is a hexagonal ferrite powder, tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.
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公开(公告)号：US20240203451A1
公开(公告)日：2024-06-20
申请号：US18538626
申请日：2023-12-13
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/65 , G11B5/00813
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. One or more components selected from the group consisting of a fatty acid and a fatty acid amide are included in a portion on the non-magnetic support on a magnetic layer side, a C—H derived C concentration calculated from a C—H peak surface area ratio of C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 50 at % or more, and standard deviation σ of the C—H derived C concentration in a width direction of the surface of the magnetic layer is 2.0 at % or less.
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公开(公告)号：US20240119963A1
公开(公告)日：2024-04-11
申请号：US18466600
申请日：2023-09-13
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/584 , G11B5/7021 , G11B5/70678 , G11B5/714 , G11B5/78 , G11B15/43
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which the number of recesses existing on a surface of the magnetic layer and having an equivalent circle diameter of 0.25 μm or more and 0.55 μm or less is 10 or more and 500 or less per an area of 40 μm×40 μm, and standard deviation a of the number of the recesses in a width direction of the surface of the magnetic layer is 50 or less.
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公开(公告)号：US20240112698A1
公开(公告)日：2024-04-04
申请号：US18460081
申请日：2023-09-01
Applicant: FUJIFILM Corporation
Inventor： Yujin SHIBATA , Norihito KASADA , Takuto KUROKAWA , So MATSUYAMA
CPC classification number: G11B5/70678 , G11B5/714 , G11B5/7358
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which an arithmetic average roughness Ra measured on a surface of the magnetic layer is 1.5 nm or less, and standard deviation a of the Ra in a width direction of the surface of the magnetic layer is 0.20 nm or less.
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公开(公告)号：US20240105229A1
公开(公告)日：2024-03-28
申请号：US18516132
申请日：2023-11-21
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/7356 , G11B5/7085 , G11B5/78
Abstract: A magnetic tape in which a tape thickness of the magnetic tape is 5.2 μm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
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