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公开(公告)号：US12009017B2
公开(公告)日：2024-06-11
申请号：US17730763
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yusuke Kaneko
CPC classification number: G11B5/5928 , G11B5/70678 , G11B5/7356 , G11B5/78 , 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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公开(公告)号：US11631429B2
公开(公告)日：2023-04-18
申请号：US17378783
申请日：2021-07-19
Applicant: FUJIFILM Corporation
Inventor： Yusuke Kaneko , Norihito Kasada
IPC: G11B23/08 , G11B5/73 , G11B5/78 , G11B5/733 , 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 more than 0.30 g 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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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：US11810603B2
公开(公告)日：2023-11-07
申请号：US17822803
申请日：2022-08-29
Applicant: FUJIFILM CORPORATION
Inventor： Junichi Nakamigawa , Yasushi Komori , Yusuke Kaneko , Tadashi Kira , Norihito Kasada , Toru Nakao
CPC classification number: G11B5/584 , G11B5/00817
Abstract: A magnetic tape cartridge includes a case that accommodates a magnetic tape on which a plurality of servo bands and a plurality of data bands are formed, servo patterns being recorded in the servo bands, and a memory provided in the case. The memory stores servo pattern interval-related information related to a servo pattern interval determined for each of the plurality of data bands included in the magnetic tape. The servo pattern interval is commonly used for a plurality of division areas obtained by dividing the data band in a width direction of the magnetic tape, and is a representative interval between a first servo pattern and a second servo pattern.
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公开(公告)号：US20220358958A1
公开(公告)日：2022-11-10
申请号：US17730311
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke Kaneko
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, and a servo band spacing obtained after storage of N cycles, in a case where predetermined storage is set to one cycle, is defined as A, a medium life calculated by a linear function that is derived from the value of A and the value of the logarithm logeT of total storage time T of the storage of N cycles is 3 years or longer. The medium life is T in a case where the A satisfies Equation a: A=1.5−B. The B is calculated by multiplying a difference between a maximum value and a minimum value of the servo band spacings obtained in each of the five environments by ½.
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Patent Agency Ranking
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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公开(公告)号：US20210201945A1
公开(公告)日：2021-07-01
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：US12136438B2
公开(公告)日：2024-11-05
申请号：US18320418
申请日：2023-05-19
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke Kaneko , Toru Nakao , Atsushi Musha , Norihito Kasada
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：US12040002B2
公开(公告)日：2024-07-16
申请号：US17730348
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yusuke Kaneko
CPC classification number: G11B5/70678 , G11B5/5928 , G11B5/7356 , G11B15/43 , G11B33/14
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：US11972784B2
公开(公告)日：2024-04-30
申请号：US17847800
申请日：2022-06-23
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Yusuke Kaneko
CPC classification number: G11B5/73929 , G11B5/70678 , G11B5/7358 , G11B15/43
Abstract: The magnetic tape cartridge group includes a plurality of magnetic tape cartridges. Regarding 100 reels of magnetic tape cartridges, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before predetermined storage and a servo band spacing obtained after the predetermined storage is defined as A, an arithmetic mean of medium lives calculated by a linear function derived from a value of A obtained for different N and a value of the logarithm of total storage time T of the storage of N cycles is 3 years or longer and 3σ is 1 year or shorter. Medium life: T in a case where A satisfies A=1.5−B. B: a value calculated by multiplying a difference between a maximum value and a minimum value of servo band spacings obtained in each of the five environments by ½.
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