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公开(公告)号：US11631428B2
公开(公告)日：2023-04-18
申请号：US17378782
申请日：2021-07-19
Applicant: FUJIFILM Corporation
Inventor： Yusuke Kaneko , Norihito Kasada
IPC: G11B23/08 , G11B5/73 , G11B5/733 , G11B5/78 , G11B23/107
Abstract: The magnetic tape cartridge includes a magnetic tape that is accommodated in the magnetic tape cartridge while being wound around a reel hub. A water absorption amount of the magnetic tape measured after the magnetic tape cartridge is stored in a storage environment of a temperature of 32° C. and a relative humidity of 80% for 10 days is 0.30 g or less as a value in terms of a length of the magnetic tape of 1000 m, and the water absorption amount is a value measured in a measurement environment with a temperature of 21° C. and a relative humidity of 50% within 1 hour after the storage.
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12.发明授权公开(公告)号：US11270732B2
公开(公告)日：2022-03-08
申请号：US17161031
申请日：2021-01-28
Applicant: FUJIFILM Corporation
Inventor： Yuto Murata , Yusuke Kaneko , Norihito Kasada
IPC: G11B5/78 , G11B5/70 , G11B5/73 , G11B5/008 , G11B15/43 , G11B20/12 , G11B5/708 , G11B5/735 , G11B15/32
Abstract: In the probability distribution calculated from TDSage, TDSenv, and TC, the magnetic tape has the probability Pfail of equal to or less than 0.2%, in which the absolute value of ΔSB exceeds 0.3 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：US11823711B2
公开(公告)日：2023-11-21
申请号：US17847970
申请日：2022-06-23
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yusuke Kaneko
CPC classification number: G11B20/1201 , G11B5/00813
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：US20220358961A1
公开(公告)日：2022-11-10
申请号：US17730763
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke Kaneko
IPC: G11B5/592 , G11B5/78 , G11B5/706 , G11B5/735 , G11B23/107
Abstract: In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in an environment of a temperature of 32° C. and relative humidity of 55% and a servo band spacing obtained after storage in the environment for a storage time T is set to A, and T is defined as 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours, a medium life calculated by a linear function of A and a logarithm logeT of T, that are derived from a value of A and a value of the logarithm logeT of T obtained for each T is 3 years or longer. The medium life is T in a case where the A satisfies Equation 1: A=1.5−B.
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Patent Agency Ranking
15.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：US12217777B2
公开(公告)日：2025-02-04
申请号：US17730687
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yusuke Kaneko
Abstract: In the magnetic tape, a magnetic tape deformation amount after storage for 3 months each in a predetermined environment is 0.50 μm or less, a rate of a change in the magnetic tape deformation amount with respect to a change in relative humidity is 0.0001 μm/% to 0.0500 μm/%, and a rate of a change in magnetic tape deformation amount with respect to a change in temperature is 0.0010 μm/° C. to 0.1000 μm/° C.
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公开(公告)号：US11705159B2
公开(公告)日：2023-07-18
申请号：US17591593
申请日：2022-02-02
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke Kaneko , Toru Nakao , Atsushi Musha , Norihito Kasada
CPC classification number: G11B23/042 , G11B15/06 , G11B15/43
Abstract: A magnetic tape cartridge includes a case in which a magnetic tape is housed, and an NVM of a cartridge memory provided in the case. The NVM stores cartridge information including an identification ID regarding an allowable range of temperature/humidity in using the magnetic tape, an upper limit of a preservation period of the magnetic tape, and an upper limit of a use frequency of the magnetic tape.
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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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