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公开(公告)号：US11017805B2
公开(公告)日：2021-05-25
申请号：US16795800
申请日：2020-02-20
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Atsushi Musha
Abstract: A magnetic tape reading apparatus comprises an acquisition unit that acquires information on linearity of a servo pattern to be recorded on a servo band of a magnetic tape, a reading element unit in which at least two reading elements each of which reads data from a specific track region included in the magnetic tape are disposed, a servo reading element that reads the servo pattern, a control unit that performs control of positioning the reading element unit, a derivation unit that derives a deviation amount, and an extraction unit that extracts data recorded on the reading target track by performing a waveform equalization process on each reading result for the reading elements in accordance with the deviation amount.
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公开(公告)号：US10482915B2
公开(公告)日：2019-11-19
申请号：US15854439
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Tetsuya Kaneko , Norihito Kasada
IPC: G11B5/78 , G11B15/675 , G11B5/708 , G11B5/39 , G11B5/70
Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which the reproducing head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder, a binding agent, and fatty acid ester on the non-magnetic support, a full width at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 7.0 nm, a full width at half maximum of spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 9.0 nm.
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公开(公告)号：US10431249B2
公开(公告)日：2019-10-01
申请号：US15621464
申请日：2017-06-13
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
Abstract: A magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support. The total thickness of the magnetic tape is less than equal to 5.30 μm. The magnetic layer includes a timing-based servo pattern. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm. One or more components selected from a fatty acid and a fatty acid amide are included in the magnetic layer, and 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 greater than or equal to 45 atom %.
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34.发明授权公开(公告)号：US10403320B2
公开(公告)日：2019-09-03
申请号：US15848173
申请日：2017-12-20
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 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 logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
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公开(公告)号：US10373633B2
公开(公告)日：2019-08-06
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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Patent Agency Ranking
36.发明授权公开(公告)号：US10304486B2
公开(公告)日：2019-05-28
申请号：US15848173
申请日：2017-12-20
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 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 logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
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37.发明授权公开(公告)号：US09773519B2
公开(公告)日：2017-09-26
申请号：US15388864
申请日：2016-12-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko
CPC classification number: G11B5/78 , G11B5/584 , G11B5/5928 , G11B5/70
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the coercive force measured in the longitudinal direction of the magnetic tape is less than or equal to 167 kA/m, a timing-based servo pattern is present on the magnetic layer, and the edge shape specified by observing the timing-based servo pattern with a magnetic force microscope is a shape in which the difference between the value L99.9 of the 99.9% cumulative distribution function of the width of misalignment from the ideal shape in the longitudinal direction of the magnetic tape and the value L0.1 of the 0.1% cumulative distribution function, L99.9−L0.1, is less than or equal to 180 nm.
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公开(公告)号：US12176014B2
公开(公告)日：2024-12-24
申请号：US18400011
申请日：2023-12-29
Applicant: FUJIFILM CORPORATION
Inventor： Toru Nakao , Tetsuya Kaneko , Yoichi Akano
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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公开(公告)号：US12057148B2
公开(公告)日：2024-08-06
申请号：US18172693
申请日：2023-02-22
Applicant: FUJIFILM Corporation
Inventor： Toru Nakao , Tetsuya Kaneko , Yoichi Akano
CPC classification number: G11B5/56 , G11B5/00821
Abstract: A magnetic head includes a pair of servo reading elements corresponding to a pair of servo bands adjacent to each other in a width direction. A processor acquires a first signal based on a first result obtained by reading a servo pattern in a first servo band by a first servo reading element included in a pair of servo reading elements, acquires a second signal based on a second result obtained by reading the servo pattern in a second servo band by a second servo reading element included in the pair of servo reading elements, and outputs a deviation amount signal corresponding to a deviation amount in time between the first signal and the second signal.
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公开(公告)号：US12027185B2
公开(公告)日：2024-07-02
申请号：US18145539
申请日：2022-12-22
Applicant: FUJIFILM Corporation
Inventor： Yoichi Akano , Toru Nakao , Tetsuya Kaneko
CPC classification number: G11B27/36 , G11B5/00813
Abstract: A detection device includes a processing device and a storage medium. The processing device stores a result of reading a servo pattern by a servo reading element from a magnetic tape in which the servo pattern is recorded in a servo band, in the storage medium as an ideal waveform signal indicating an ideal waveform, acquires a servo band signal which is a result of reading the servo band by the servo reading element, and detects a servo pattern signal indicating the servo pattern by comparing the ideal waveform signal stored in the storage medium with the servo band signal.
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