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公开(公告)号：US11735218B2
公开(公告)日：2023-08-22
申请号：US17680866
申请日：2022-02-25
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yuto Murata
CPC classification number: G11B5/78 , G11B23/042
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount Δw in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(σG/Δw)×100 is 10% or less. The σG is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.
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12.发明授权公开(公告)号：US11295776B2
公开(公告)日：2022-04-05
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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公开(公告)号：US11257518B2
公开(公告)日：2022-02-22
申请号：US16825360
申请日：2020-03-20
Applicant: FUJIFILM Corporation
Inventor： Yuto Murata , Norihito Kasada , Yusuke Kagawa
Abstract: Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support and a magnetic layer containing a ferromagnetic powder, and has a tape thickness of 5.3 μm or less, the magnetic layer includes a plurality of servo bands, and a difference (Ginner−Gouter) between a servo band interval Ginner in a range of 49 m to 51 m from a tape inner end and a servo band interval Gouter in a range of 49 m to 51 m from a tape outer end is −3.9 μm to −1.1 μm as a value measured on 100th day from a date of magnetic tape cartridge manufacture.
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公开(公告)号：US11887636B2
公开(公告)日：2024-01-30
申请号：US18298730
申请日：2023-04-11
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yuto Murata , Nagisa Yamasaki
CPC classification number: G11B5/70 , G11B5/00813 , G11B5/00826 , G11B5/4893 , G11B5/00856 , G11B5/7356 , G11B2220/90 , G11B2220/956
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
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Patent Agency Ranking
公开(公告)号：US11482249B2
公开(公告)日：2022-10-25
申请号：US17130857
申请日：2020-12-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yuto Murata , Yusuke Kaneko
Abstract: A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16° C. and a relative humidity of 20%, a temperature of 16° C. and a relative humidity of 80%, a temperature of 26° C. and a relative humidity of 80%, a temperature of 32° C. and a relative humidity of 20% and a temperature of 32° C. and a relative humidity of 55% is 1.43 μm/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 μm/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 μm/N/° C. or less.
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公开(公告)号：US11289124B2
公开(公告)日：2022-03-29
申请号：US17167589
申请日：2021-02-04
Applicant: FUJIFILM Corporation
Inventor： Yusuke Kaneko , Yuto Murata , Norihito Kasada
Abstract: A magnetic tape device, a magnetic tape, and a magnetic tape cartridge, in which the 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, the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a center line average roughness Ra measured regarding a surface of a back coating layer of the magnetic tape with an atomic force microscope is in a range of 5 to 13 nm.
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17.发明授权公开(公告)号：US11270727B2
公开(公告)日：2022-03-08
申请号：US16825534
申请日：2020-03-20
Applicant: FUJIFILM Corporation
Inventor： Yuto Murata , Norihito Kasada , Yusuke Kagawa
Abstract: In the magnetic tape cartridge, a tape has a tape thickness of 5.3 μm or less, and a difference Winner−Wouter between a tape width Winner at a position of 50 m±1 m from a tape inner end and a tape width Wouter at a position of 50 m±1 m from a tape outer end is 4.1 μm to 19.9 μm as a value measured on 100th day from a date of magnetic tape cartridge manufacture, and a difference Ginner−Gouter between a servo band interval Ginner in a range of 49 m to 51 m from the tape inner end and a servo band interval Gouter in a range of 49 m to 51 m from the tape outer end is −3.9 μm to 0.0 μm as a value measured on 100th day from the date of magnetic tape cartridge manufacture.
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公开(公告)号：US10679659B2
公开(公告)日：2020-06-09
申请号：US16281169
申请日：2019-02-21
Applicant: FUJIFILM Corporation
Inventor： Yusuke Kagawa , Norihito Kasada , Yuto Murata
IPC: G11B5/78 , G11B23/107 , G11B5/70 , G11B5/73 , G11B5/735
Abstract: Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, a tape thickness is equal to or smaller than 5.2 μm, a tape width difference (B−A) between a tape width A at a position of 10 m±1 m from a tape outer end and a tape width B at a position of 50 m±1 m from a tape inner end is 2.4 μm to 12.0 μm, and the tape width A and the tape width B are values measured 100 days from the date of magnetic tape cartridge manufacture.
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公开(公告)号：US20190259417A1
公开(公告)日：2019-08-22
申请号：US16281169
申请日：2019-02-21
Applicant: FUJIFILM Corporation
Inventor： Yusuke KAGAWA , Norihito Kasada , Yuto Murata
Abstract: Provided is a magnetic tape cartridge of a single reel type in which a magnetic tape is wound around a reel, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, a tape thickness is equal to or smaller than 5.2 a tape width difference (B−A) between a tape width A at a position of 10 m±1 m from a tape outer end and a tape width B at a position of 50 m±1 m from a tape inner end is 2.4 μm to 12.0 μm, and the tape width A and the tape width B are values measured 100 days from the date of magnetic tape cartridge manufacture.
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