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公开(公告)号：US12087334B2
公开(公告)日：2024-09-10
申请号：US18188609
申请日：2023-03-23
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Kento Nishimura
CPC classification number: G11B5/3163 , G11B5/584
Abstract: Provided are a magnetic recording heading having a magnetic film including a write gap, in which in the write gap, a recording surface-side gap width is narrower than a back surface-side gap width, and the write gap has an opening portion formed by ion beam processing at a gap end portion on a recording surface side, a magnetic recording apparatus including the magnetic recording head, a manufacturing method of the magnetic recording head, and a manufacturing method of a magnetic recording medium having a servo pattern, including forming a servo pattern on the magnetic recording medium by the magnetic recording head.
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公开(公告)号：US12073859B2
公开(公告)日：2024-08-27
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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公开(公告)号：US20230317108A1
公开(公告)日：2023-10-05
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：US20230139005A1
公开(公告)日：2023-05-04
申请号：US18050231
申请日：2022-10-27
Applicant: FUJIFILM Corporation
Inventor： Toru NAKAO , Tetsuya Kaneko , Yoichi Akano
IPC: G11B27/36
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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公开(公告)号：US10510369B2
公开(公告)日：2019-12-17
申请号：US15626355
申请日：2017-06-19
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , 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, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the magnetic layer includes an abrasive. In addition, the tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00.
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Patent Agency Ranking
公开(公告)号：US10431248B2
公开(公告)日：2019-10-01
申请号：US15614876
申请日：2017-06-06
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
Abstract: A magnetic tape includes a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. 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 at least 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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公开(公告)号：US10236025B2
公开(公告)日：2019-03-19
申请号：US15854520
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
Abstract: Provided are an evaluation method of a magnetic tape, in which the magnetic tape which is an evaluation target includes a magnetic layer including a servo pattern, the method including: reading the servo pattern by a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element; measuring electric resistance of the tunnel magnetoresistance effect type element after the reading; and determining quality of the magnetic tape by using a degree of a decrease in the measured electric resistance from a reference value as an index, and a manufacturing method of a magnetic tape including: evaluating the magnetic tape including a servo pattern in a magnetic layer by the evaluation method.
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公开(公告)号：US09779772B1
公开(公告)日：2017-10-03
申请号：US15464991
申请日：2017-03-21
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
CPC classification number: G11B5/712 , G11B5/5926 , G11B5/70 , G11B5/78
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein a timing based servo pattern is present on the magnetic layer, the centerline average surface roughness Ra that is measured on the surface of the magnetic layer is less than or equal to 1.8 nm, and the coefficient of friction that is measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35.
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公开(公告)号：US12073853B2
公开(公告)日：2024-08-27
申请号：US18163606
申请日：2023-02-02
Applicant: FUJIFILM Corporation
Inventor： Toru Nakao , Norihito Kasada , Tetsuya Kaneko , Atsushi Musha
CPC classification number: G11B5/00813 , G11B5/78
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：US11996125B2
公开(公告)日：2024-05-28
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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