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公开(公告)号：US20200251140A1
公开(公告)日：2020-08-06
申请号：US16777279
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC: G11B5/706 , G11B5/708 , G01B11/06 , G11B5/39 , G11B5/78 , G11B5/71 , G11B27/022 , G11B20/10 , G11B23/50 , G11B5/702 , G11B5/584 , G11B5/00 , B82Y25/00 , B82Y10/00
Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing S0.5 measured, after n-hexane cleaning, on a surface of the magnetic layer under a pressure of 0.5 atm by optical interferometry and a spacing S13.5 measured, after n-hexane cleaning, under a pressure of 13.5 atm is 3.0 nm or less, and S0.5 is 5.0 nm or more.
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公开(公告)号：US10706875B2
公开(公告)日：2020-07-07
申请号：US16456831
申请日：2019-06-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which 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 of the magnetic tape at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
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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：US12243568B2
公开(公告)日：2025-03-04
申请号：US18145119
申请日：2022-12-22
Applicant: FUJIFILM Corporation
Inventor： Nagisa Yamasaki , Toru Nakao , Atsushi Musha , Kento Takishima
IPC: G11B5/53
Abstract: A magnetic tape cartridge includes a magnetic tape, and a storage medium in which information on the magnetic tape is stored. The magnetic tape has a recording surface. Data is recorded in the recording surface by a magnetic head in a state in which the magnetic tape is made to travel. The magnetic head is disposed at an inclined posture with respect to a width direction of the magnetic tape along the recording surface. Angle adjustment information obtained before the data is recorded in the recording surface is stored in the storage medium. The angle adjustment information is information for adjusting an angle at which the magnetic head is inclined with respect to the width direction along the recording surface.
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35.发明公开公开(公告)号：US20230206946A1
公开(公告)日：2023-06-29
申请号：US18145257
申请日：2022-12-22
Applicant: FUJIFILM Corporation
Inventor： Nagisa YAMASAKI , Toru Nakao , Atsushi Musha , Kento Takishima
IPC: G11B5/53
Abstract: A magnetic tape cartridge includes a magnetic tape, and a storage medium in which information on the magnetic tape is stored. The magnetic tape has a recording surface. Data is recorded in the recording surface by a magnetic head in a state in which the magnetic tape is made to travel. The magnetic head is disposed at an inclined posture with respect to a width direction of the magnetic tape along the recording surface. Angle adjustment information obtained at a data recording timing which is a timing at which the data is recorded in the recording surface is stored in the storage medium. The angle adjustment information is information for adjusting an angle at which the magnetic head is inclined with respect to the width direction along the recording surface.
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Patent Agency Ranking
36.发明公开公开(公告)号：US20230206945A1
公开(公告)日：2023-06-29
申请号：US18145119
申请日：2022-12-22
Applicant: FUJIFILM Corporation
Inventor： Nagisa YAMASAKI , Toru Nakao , Atsushi Musha , Kento Takishima
IPC: G11B5/53
Abstract: A magnetic tape cartridge includes a magnetic tape, and a storage medium in which information on the magnetic tape is stored. The magnetic tape has a recording surface. Data is recorded in the recording surface by a magnetic head in a state in which the magnetic tape is made to travel. The magnetic head is disposed at an inclined posture with respect to a width direction of the magnetic tape along the recording surface. Angle adjustment information obtained before the data is recorded in the recording surface is stored in the storage medium. The angle adjustment information is information for adjusting an angle at which the magnetic head is inclined with respect to the width direction along the recording surface.
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公开(公告)号：US11417358B2
公开(公告)日：2022-08-16
申请号：US17330680
申请日：2021-05-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC: G11B5/584 , G11B5/706 , G11B5/708 , G11B5/702 , G11B5/70 , G11B20/10 , G11B5/78 , G11B27/022 , G11B5/00 , B82Y25/00 , B82Y10/00
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference L99.9−L0.1 between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an absolute value ΔN of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 or more and 0.40 or less.
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公开(公告)号：US11355146B2
公开(公告)日：2022-06-07
申请号：US16777368
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Atsushi Musha
Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and in which a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.
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公开(公告)号：US11087787B2
公开(公告)日：2021-08-10
申请号：US16777411
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC: G11B5/58 , G11B5/584 , G11B5/706 , G11B5/708 , G11B5/702 , G11B5/70 , G11B20/10 , G11B5/78 , G11B27/022 , G11B5/00 , B82Y25/00 , B82Y10/00
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference L99.9−L0.1 between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an absolute value ΔN of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 or more and 0.40 or less.
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公开(公告)号：US20200251136A1
公开(公告)日：2020-08-06
申请号：US16777418
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito Kasada , Atsushi Musha
IPC: G11B5/584 , G11B23/50 , G11B5/70 , G11B27/022 , G11B5/706 , G11B20/10 , G11B5/708 , G01B11/06 , G11B5/78 , G11B5/702 , G11B5/00 , B82Y10/00 , B82Y25/00
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before methyl-ethyl-ketone cleaning is greater than 0 nm and 15.0 nm or less. w
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