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公开(公告)号：US20230142229A1
公开(公告)日：2023-05-11
申请号：US18152527
申请日：2023-01-10
Applicant: FUJIFILM Corporation
Inventor： Ren ISHIKAWA , Yuto MURATA
IPC: G11B21/10
CPC classification number: G11B21/103
Abstract: Provided is a magnetic tape device including: a magnetic head having a magnetic element that acts on a magnetic layer formed on a front surface of a magnetic tape; and a position adjusting actuator that adjusts a position of the magnetic element in a normal direction of the front surface by moving the magnetic head; and a processor that controls an operation of the position adjusting actuator.
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公开(公告)号：US20230335160A1
公开(公告)日：2023-10-19
申请号：US18299289
申请日：2023-04-12
Applicant: FUJIFILM Corporation
Inventor： Yuto MURATA , Norihito KASADA , Nagisa YAMASAKI
CPC classification number: G11B5/7356 , G11B5/78 , G11B20/20
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a non-linear component of tape width deformation generated by storage for 10 days in an environment of a temperature of 60° C. and a relative humidity of 20% is 100 nm or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
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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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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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5.发明公开公开(公告)号：US20240105227A1
公开(公告)日：2024-03-28
申请号：US18524221
申请日：2023-11-30
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
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：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：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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公开(公告)号：US20230419993A1
公开(公告)日：2023-12-28
申请号：US18298084
申请日：2023-04-10
Applicant: FUJIFILM Corporation
Inventor： Nagisa YAMASAKI , Norihito KASADA , Yuto MURATA
CPC classification number: G11B5/5928 , G11B5/78
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. The number of recesses existing on a surface of the magnetic layer and having an equivalent circle diameter of 0.15 μm or more and 0.25 μm or less is 100 or more and 2500 or less per an area of 40 μm×40 μm. Standard deviation σ of the number of the recesses in a width direction of the surface of the magnetic layer is 100 or less.
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公开(公告)号：US20230352045A1
公开(公告)日：2023-11-02
申请号：US18298130
申请日：2023-04-10
Applicant: FUJIFILM Corporation
Inventor： Yuto MURATA , Norihito Kasada , Nagisa Yamasaki
CPC classification number: G11B5/70678 , G11B5/7356 , G11B5/5928 , G11B5/714
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a non-linear component of a signal phase difference generated by storage for 10 days in an environment of a temperature of 60° C. and a relative humidity of 20% is 17.5 nm or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
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公开(公告)号：US20230335159A1
公开(公告)日：2023-10-19
申请号：US18298730
申请日：2023-04-11
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yuto MURATA , Nagisa YAMASAKI
CPC classification number: G11B5/7356 , G11B5/00856
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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