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公开(公告)号：US20200251141A1
公开(公告)日：2020-08-06
申请号：US16777393
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA
Abstract: The magnetic tape in which the followings are satisfied, after the magnetic layer is pressed at a pressure of 70 atm. A full width at half maximum of a spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 15.0 nm; a full width at half maximum of a spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 15.0 nm; and a difference (Safter−Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Sbefore measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm.
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公开(公告)号：US20200251139A1
公开(公告)日：2020-08-06
申请号：US16777201
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Atsushi MUSHA
Abstract: The magnetic tape include a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, 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 isoelectric point of a surface zeta potential of the magnetic layer is 5.5 or more.
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公开(公告)号：US20200251134A1
公开(公告)日：2020-08-06
申请号：US16777312
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Atsushi MUSHA
IPC: G11B5/584 , G11B20/10 , G11B5/706 , G11B5/702 , G11B5/708 , G11B27/022 , G11B5/39 , G11B5/70 , G11B5/78 , B82Y10/00 , G11B5/00 , B82Y25/00
Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, 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 isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less.
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公开(公告)号：US20190295588A1
公开(公告)日：2019-09-26
申请号：US16361797
申请日：2019-03-22
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, 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：US20190295581A1
公开(公告)日：2019-09-26
申请号：US16361589
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 ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and 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.
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Patent Agency Ranking
公开(公告)号：US20190088278A1
公开(公告)日：2019-03-21
申请号：US16182083
申请日：2018-11-06
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/714 , G11B5/00813 , G11B5/3909 , G11B5/584 , G11B5/70 , G11B5/70615 , G11B5/71
Abstract: The magnetic tape device includes a magnetic tape including a magnetic layer, 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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公开(公告)号：US20190027181A1
公开(公告)日：2019-01-24
申请号：US16038847
申请日：2018-07-18
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Toshio TADA , Norihito KASADA , Takuto KUROKAWA
Abstract: Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110)/Int(114) of a hexagonal ferrite crystal structure obtained by an XRD analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between the spacings measured by optical interferometry regarding the surface of the back coating layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.
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公开(公告)号：US20190027176A1
公开(公告)日：2019-01-24
申请号：US16037564
申请日：2018-07-17
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Norihito KASADA , Toshio TADA , Eiki OZAWA
IPC: G11B5/706
CPC classification number: G11B5/70615 , G11B5/70 , G11B5/70678 , G11B5/7085
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：US20190027172A1
公开(公告)日：2019-01-24
申请号：US16038545
申请日：2018-07-18
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 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, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, 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, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.
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公开(公告)号：US20190027171A1
公开(公告)日：2019-01-24
申请号：US16038514
申请日：2018-07-18
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/647 , G11B5/70 , G11B5/702 , G11B5/70678 , G11B5/708 , G11B5/735 , H01F1/113 , H01F1/348
Abstract: The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, 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, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.
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