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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：US20210257001A1
公开(公告)日：2021-08-19
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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3.发明公开公开(公告)号：US20230290379A1
公开(公告)日：2023-09-14
申请号：US18320418
申请日：2023-05-19
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke KANEKO , Toru NAKAO , Atsushi MUSHA , Norihito KASADA
CPC classification number: G11B23/042 , G11B15/43 , G11B15/06
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：US20220415350A1
公开(公告)日：2022-12-29
申请号：US17847800
申请日：2022-06-23
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke KANEKO
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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公开(公告)号：US20220366935A1
公开(公告)日：2022-11-17
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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Patent Agency Ranking
公开(公告)号：US20220028421A1
公开(公告)日：2022-01-27
申请号：US17378782
申请日：2021-07-19
Applicant: FUJIFILM Corporation
Inventor： Yusuke KANEKO , Norihito KASADA
IPC: G11B5/73
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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公开(公告)号：US20230065359A1
公开(公告)日：2023-03-02
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
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：US20220254375A1
公开(公告)日：2022-08-11
申请号：US17591593
申请日：2022-02-02
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke KANEKO , Toru NAKAO , Atsushi MUSHA , Norihito KASADA
IPC: G11B5/78
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：US20220028422A1
公开(公告)日：2022-01-27
申请号：US17378783
申请日：2021-07-19
Applicant: FUJIFILM Corporation
Inventor： Yusuke KANEKO , Norihito KASADA
IPC: G11B5/73
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：US20210241795A1
公开(公告)日：2021-08-05
申请号：US17161031
申请日：2021-01-28
Applicant: FUJIFILM Corporation
Inventor： Yuto MURATA , Yusuke KANEKO , Norihito KASADA
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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