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41.发明授权公开(公告)号：US11996128B2
公开(公告)日：2024-05-28
申请号：US18050716
申请日：2022-10-28
Applicant: FUJIFILM Corporation
Inventor： Megumi Nakano , Atsushi Musha , Tetsuya Kaneko
CPC classification number: G11B5/59688 , G11B5/02 , G11B5/1278
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：US20230169992A1
公开(公告)日：2023-06-01
申请号：US18059185
申请日：2022-11-28
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Toru Nakao , Yoichi AKANO
CPC classification number: G11B5/00813 , G11B5/78
Abstract: A detection device includes a processor. The processor compares a servo band signal, which is a result of reading a servo band in which a servo pattern is recorded from a magnetic tape including the servo band by a servo reading element, with a threshold value to detect a servo pattern signal indicating the servo pattern. The threshold value is determined in accordance with an angle formed by the servo pattern and the servo reading element.
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公开(公告)号：US10679660B2
公开(公告)日：2020-06-09
申请号：US16440161
申请日：2019-06-13
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
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：US10522171B2
公开(公告)日：2019-12-31
申请号：US15627696
申请日：2017-06-20
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
Abstract: A magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 μm. The magnetic layer includes a timing-based servo pattern, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.
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公开(公告)号：US10510368B2
公开(公告)日：2019-12-17
申请号：US15624897
申请日：2017-06-16
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Tetsuya Kaneko , Norihito Kasada
Abstract: A magnetic tape is provided in which the total thickness is less than or equal to 5.30 μm. The magnetic layer includes a timing-based servo pattern and also a fatty acid ester; and the magnetic layer surface Ra is less than or equal to 1.8 nm. The full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing vacuum heating with respect to the magnetic tape is greater than 0 nm and less than or equal to 7.0 nm, while the same value measured after performing the vacuum heating is greater than 0 nm and less than or equal to 7.0 nm, also. The difference between a spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and less than or equal to 8.0 nm.
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Patent Agency Ranking
公开(公告)号：US10438628B2
公开(公告)日：2019-10-08
申请号：US15854383
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Tetsuya Kaneko
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 powder and a binding agent on the non-magnetic support, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
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公开(公告)号：US20190295590A1
公开(公告)日：2019-09-26
申请号：US16440161
申请日：2019-06-13
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
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：US10347280B2
公开(公告)日：2019-07-09
申请号：US15626720
申请日：2017-06-19
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
Abstract: A magnetic tape includes a non-magnetic layer containing non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer containing ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is equal to or less than 0.60 μm. The magnetic layer includes a timing-based servo pattern. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer. The C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.
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公开(公告)号：US09984716B1
公开(公告)日：2018-05-29
申请号：US15854507
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
CPC classification number: G11B5/84 , G11B5/3909 , G11B5/70 , G11B5/71 , G11B5/725 , G11B5/8408
Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
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公开(公告)号：US09978414B1
公开(公告)日：2018-05-22
申请号：US15854474
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
CPC classification number: G11B5/70678 , G11B5/3909 , G11B5/68 , G11B5/70 , G11B5/706 , G11B5/84
Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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, the magnetic layer includes a servo pattern, 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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