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公开(公告)号：US10902877B2
公开(公告)日：2021-01-26
申请号：US16812374
申请日：2020-03-09
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke Kagawa , Tetsuya Kaneko
IPC: G11B27/36 , G11B15/087 , G11B5/008 , G11B33/04
Abstract: A recording and reproducing device includes: a first acquisition unit which acquires servo band interval information representing an interval, in a width direction of a magnetic tape, between adjacent servo recording elements of plural servo recording elements which record the servo patterns on the plural servo bands, respectively; a second acquisition unit which acquires reproducing element interval information representing an interval in the width direction between respective servo reproducing elements which read the adjacent servo patterns along the width direction with respect to the plural tape drives; and a selection unit which selects a tape drive into which the magnetic tape is inserted, from the plural tape drives, using a value representing a difference between the interval represented by the servo band interval information and the interval represented by the reproducing element interval information.
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公开(公告)号：US10325623B2
公开(公告)日：2019-06-18
申请号：US15854409
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, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.
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公开(公告)号：US10325620B2
公开(公告)日：2019-06-18
申请号：US15854438
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
IPC: G11B5/09 , G11B5/39 , G11B5/66 , G11B5/596 , G11B5/592 , G11B5/55 , G11B5/008 , G11B5/584 , G11B5/70
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 powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.
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公开(公告)号：US10311909B2
公开(公告)日：2019-06-04
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：US10074393B2
公开(公告)日：2018-09-11
申请号：US15615871
申请日：2017-06-07
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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Patent Agency Ranking
公开(公告)号：US09984712B1
公开(公告)日：2018-05-29
申请号：US15854329
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Tetsuya Kaneko , Norihito Kasada
CPC classification number: G11B5/706 , G11B5/3909 , 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 powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, 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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公开(公告)号：US09972351B1
公开(公告)日：2018-05-15
申请号：US15854410
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
CPC classification number: G11B5/702 , G11B5/00826 , G11B5/3909 , G11B5/584 , G11B5/68 , G11B5/70 , G11B5/84
Abstract: The magnetic tape device including: a magnetic tape; and a servo head, in which 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 powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050.
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公开(公告)号：US09837116B2
公开(公告)日：2017-12-05
申请号：US15466143
申请日：2017-03-22
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Tetsuya Kaneko , Norihito Kasada
CPC classification number: G11B20/1201 , G11B5/00813 , G11B5/584
Abstract: The magnetic tape has a timing base servo pattern on the magnetic layer, wherein the centerline average surface roughness Ra on the surface of the magnetic layer is less than or equal to 1.8 nm, the magnetic layer contains a fatty acid ester, the full width at half maximum of spacing distribution measured by optical interferometry on the surface of the magnetic layer before and after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 7.0 nm, the difference of spacing measured by optical interferometry on the surface of the magnetic layer after and before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 8.0 nm.
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公开(公告)号：US12272390B2
公开(公告)日：2025-04-08
申请号：US18170683
申请日：2023-02-17
Applicant: FUJIFILM Corporation
Inventor： Toru Nakao , Norihito Kasada , Tetsuya Kaneko , Atsushi Musha
IPC: G11B5/58 , G11B5/584 , G11B15/43 , G11B23/027
Abstract: A magnetic tape cartridge includes a case in which a magnetic tape is accommodated and a storage medium provided in the case. At least one of reading or writing of data is performed by a plurality of magnetic elements, which are linearly disposed, with respect to the magnetic tape pulled out from the case. A disposition direction of the plurality of magnetic elements is tilted toward an entire length direction side of the magnetic tape with respect to a width direction of the magnetic tape. The storage medium stores tilt feature information indicating a feature of tilt of the disposition direction with respect to the width direction.
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公开(公告)号：US12243564B2
公开(公告)日：2025-03-04
申请号：US18405166
申请日：2024-01-05
Applicant: FUJIFILM Corporation
Inventor： Toru Nakao , Tetsuya Kaneko , Yoichi Akano
Abstract: A detection device includes a processing device and a storage medium. An ideal waveform signal indicating an ideal waveform of a servo pattern signal which is a result of reading a servo pattern recorded in a servo band of a magnetic tape by a servo reading element is stored in advance in the storage medium. The processing device acquires a servo band signal which is a result of reading the servo band by the servo reading element, and detects the servo pattern signal by comparing the servo band signal with the ideal waveform signal.
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