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公开(公告)号：US20170372736A1
公开(公告)日：2017-12-28
申请号：US15628814
申请日：2017-06-21
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/588 , G11B5/584 , G11B5/70 , G11B5/70678 , G11B5/7085 , G11B5/78
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support, in which the total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
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公开(公告)号：US20170355022A1
公开(公告)日：2017-12-14
申请号：US15615871
申请日：2017-06-07
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/78 , G11B5/584 , G11B5/7023 , G11B5/70615 , G11B5/70678 , G11B5/714
Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
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公开(公告)号：US20240379120A1
公开(公告)日：2024-11-14
申请号：US18783932
申请日：2024-07-25
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Toru NAKAO , Yoichi AKANO
Abstract: A detection device includes a processing device and a storage medium. The processing device stores a result of reading a reference servo pattern by a servo reading element in the storage medium as an ideal waveform signal, acquires a servo band signal which is a result of reading a servo pattern recorded in a servo band by the servo reading element, and detects a servo pattern signal which is a result of reading the servo pattern by the servo reading element by comparing the ideal waveform signal with the servo band signal. The reference servo pattern is recorded between a BOT section and an EOT section in a longitudinal direction of the magnetic tape.
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公开(公告)号：US20240379118A1
公开(公告)日：2024-11-14
申请号：US18779785
申请日：2024-07-22
Applicant: FUJIFILM Corporation
Inventor： Toru NAKAO , Norihito KASADA , Tetsuya KANEKO , Atsushi MUSHA
Abstract: Provided is a magnetic tape cartridge including: a case in which a magnetic tape on which a plurality of servo bands are formed is accommodated; and a storage medium provided in the case, in which the plurality of servo bands are formed at positions spaced apart from each other in a width direction of the magnetic tape along an entire length direction of the magnetic tape, and the storage medium stores pitch information capable of specifying a pitch in the width direction between the plurality of servo bands and distance information capable of specifying a distance between a plurality of servo reading elements that have read the plurality of servo bands.
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公开(公告)号：US20240144968A1
公开(公告)日：2024-05-02
申请号：US18400011
申请日：2023-12-29
Applicant: FUJIFILM CORPORATION
Inventor： Toru NAKAO , Tetsuya KANEKO , Yoichi AKANO
CPC classification number: G11B5/588 , G11B5/00882 , G11B5/59638
Abstract: A first straight line region and a second straight line region of the straight line region pair are inclined in opposite directions with respect to a first imaginary straight line. The first straight line region has a steeper inclined angle with respect to the first imaginary straight line than the second straight line region. Positions of both ends of the first straight line region and positions of both ends of the second straight line region are aligned in a direction corresponding to a width direction of a magnetic tape. A plurality of gap patterns deviate from each other by a predetermined interval in a direction corresponding to a longitudinal direction of the magnetic tape, between the gap patterns adjacent to each other along the direction corresponding to the width direction of the magnetic tape. A substrate is inclined with respect to the first imaginary straight line.
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Patent Agency Ranking
公开(公告)号：US20230206950A1
公开(公告)日：2023-06-29
申请号：US18145088
申请日：2022-12-22
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Toru NAKAO , Yoichi AKANO
CPC classification number: G11B5/59688 , G11B5/584
Abstract: A detection device includes a processing device and a storage medium. The processing device stores a result of reading a reference servo pattern by a servo reading element in the storage medium as an ideal waveform signal, acquires a servo band signal which is a result of reading a servo pattern recorded in a servo band by the servo reading element, and detects a servo pattern signal which is a result of reading the servo pattern by the servo reading element by comparing the ideal waveform signal with the servo band signal. The reference servo pattern is recorded between a BOT section and an EOT section in a longitudinal direction of the magnetic tape.
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27.发明申请公开(公告)号：US20230135454A1
公开(公告)日：2023-05-04
申请号：US18050716
申请日：2022-10-28
Applicant: FUJIFILM Corporation
Inventor： Megumi NAKANO , Atsushi MUSHA , Tetsuya KANEKO
Abstract: A magnetic tape cartridge includes a magnetic tape in which a plurality of servo patterns are recorded along a longitudinal direction, and a storage medium that is configured to store servo format information including servo pattern inclination information which is information on an inclination of the servo pattern with respect to a first imaginary straight line.
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公开(公告)号：US20180350400A1
公开(公告)日：2018-12-06
申请号：US16100289
申请日：2018-08-10
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/78 , G11B5/584 , G11B5/7023 , G11B5/70615 , G11B5/70678 , G11B5/714
Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
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公开(公告)号：US20180182427A1
公开(公告)日：2018-06-28
申请号：US15854403
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Tetsuya KANEKO
CPC classification number: G11B5/708 , G11B5/00817 , G11B5/3909 , G11B5/70 , G11B5/70678 , G11B5/78
Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.
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公开(公告)号：US20180182426A1
公开(公告)日：2018-06-28
申请号：US15854397
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
CPC classification number: G11B15/18 , G11B5/00817 , G11B5/3909 , G11B5/70 , G11B5/708 , G11B5/78
Abstract: The a magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 48.0° to 53.0°.
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