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公开(公告)号：US20220415356A1
公开(公告)日：2022-12-29
申请号：US17847970
申请日：2022-06-23
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke KANEKO
Abstract: Regarding 100 reels of magnetic tape cartridges in the magnetic tape cartridge group, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in a predetermined environment and a servo band spacing obtained after storage in the predetermined environment for storage time T is defined as A, an arithmetic mean of a medium lives calculated by a linear function derived from a value of A and a value of the logarithm loge T of T is 4 years or longer and 3σ is 1 year or shorter. The medium life is T in a case where A satisfies Equation 1=1.5−B, and the B is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band spacings obtained in each of the five predetermined environments by ½.
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公开(公告)号：US20220351748A1
公开(公告)日：2022-11-03
申请号：US17730348
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke Kaneko
Abstract: In the magnetic tape, a maximum value of magnetic tape deformation amounts after storage in each of five environments for 1 year is 0.50 μm or less, a rate of a change of magnetic tape deformation amount with respect to a change in relative humidity obtained from the five magnetic tape deformation amounts is 0.0001 μm/% to 0.0500 μm/%, and a rate of a change of the magnetic tape deformation amount with respect to a change in temperature obtained from the five magnetic tape deformation amounts is 0.0010 μm/° C. to 0.1000 μm/° C.
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公开(公告)号：US20220277770A1
公开(公告)日：2022-09-01
申请号：US17680961
申请日：2022-02-25
Applicant: FUJIFILM Corporation
Inventor： Shota KAMIMURA , Yuto MURATA , Tomohide UEYAMA , Norihito KASADA
IPC: G11B5/78
Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, and the roundness of the trajectory of one rotation drawn by the magnetic tape in a case where the wound magnetic tape is pulled out from the core is 100 μm or less as the arithmetic mean of the measured values at three points in the width direction of the magnetic tape.
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公开(公告)号：US20220208226A1
公开(公告)日：2022-06-30
申请号：US17645703
申请日：2021-12-22
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
IPC: G11B5/706 , G11B5/735 , G11B23/087 , G11B5/592
Abstract: The magnetic tape cartridge includes a magnetic tape, and a cartridge reel, in which, in the magnetic tape, a minimum winding deviation occurrence load measured after the magnetic tape is rewound around the cartridge reel by applying a tension of 0.20 N in a longitudinal direction of the magnetic tape is 200 N or less.
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公开(公告)号：US20220028420A1
公开(公告)日：2022-01-27
申请号：US17490008
申请日：2021-09-30
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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Patent Agency Ranking
公开(公告)号：US20210398555A1
公开(公告)日：2021-12-23
申请号：US17338688
申请日：2021-06-04
Applicant: FUJIFILM Corporation
Inventor： So MATSUYAMA , Norihito KASADA , Takuto KUROKAWA
Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 μm to 0.8 μm. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 μm to 0.50 μm, is 10 to 500 per area of 40 μm×40 μm.
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公开(公告)号：US20210375319A1
公开(公告)日：2021-12-02
申请号：US17333016
申请日：2021-05-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
IPC: G11B23/107 , G11B15/43 , G11B5/706 , G11B5/735 , G11B5/714
Abstract: A magnetic tape device, in which a magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, and the magnetic tape after running in a state where the tension is applied is caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 μm or less.
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188.发明申请公开(公告)号：US20210358521A1
公开(公告)日：2021-11-18
申请号：US17386616
申请日：2021-07-28
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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189.发明申请公开(公告)号：US20210287713A1
公开(公告)日：2021-09-16
申请号：US17195029
申请日：2021-03-08
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki Ozawa , Takashi Fujimoto
Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder in which the ferromagnetic powder is ε-iron oxide powder, and a vertical magnetization amount Φm per unit area of the magnetic recording medium measured after pressing the magnetic layer at a pressure of 70 atm is 8.0 G·μm to 80.0 G·μm.
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公开(公告)号：US20210287702A1
公开(公告)日：2021-09-16
申请号：US17329275
申请日：2021-05-25
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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