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11.发明授权公开(公告)号：US11417359B2
公开(公告)日：2022-08-16
申请号：US17021529
申请日：2020-09-15
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or greater than 5.5.
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公开(公告)号：US11417358B2
公开(公告)日：2022-08-16
申请号：US17330680
申请日：2021-05-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC: G11B5/584 , G11B5/706 , G11B5/708 , G11B5/702 , G11B5/70 , G11B20/10 , G11B5/78 , G11B27/022 , G11B5/00 , B82Y25/00 , B82Y10/00
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：US11417357B2
公开(公告)日：2022-08-16
申请号：US16522894
申请日：2019-07-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
IPC: G11B5/584 , G11B5/627 , G11B5/008 , G11B5/55 , G11B5/70 , G11B5/706 , G11B5/702 , G11B5/78 , G11B5/73 , G11B5/735 , G11B5/708
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 has a servo pattern, 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, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
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公开(公告)号：US11355148B2
公开(公告)日：2022-06-07
申请号：US16874170
申请日：2020-05-14
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference Safter−Sbefore between a spacing Safter measured on a surface of the magnetic layer by optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by optical interferometry before ethanol cleaning is more than 0 nm and 6.0 nm or less, and the non-magnetic support is an aromatic polyester support having a moisture absorption of 0.3% or less.
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公开(公告)号：US11355146B2
公开(公告)日：2022-06-07
申请号：US16777368
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Atsushi Musha
Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which 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 in which a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.
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Patent Agency Ranking
公开(公告)号：US11244702B2
公开(公告)日：2022-02-08
申请号：US17155777
申请日：2021-01-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.
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17.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
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 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
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 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
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC: G11B5/58 , G11B5/584 , G11B5/706 , G11B5/708 , G11B5/702 , G11B5/70 , G11B20/10 , G11B5/78 , G11B27/022 , G11B5/00 , B82Y25/00 , B82Y10/00
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：US20210241787A1
公开(公告)日：2021-08-05
申请号：US17160977
申请日：2021-01-28
Applicant: FUJIFILM Corporation
Inventor： Yuto MURATA , Yusuke Kaneko , Norihito Kasada
Abstract: 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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