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公开(公告)号：US11538494B2
公开(公告)日：2022-12-27
申请号：US17155536
申请日：2021-01-22
申请人： FUJIFILM Corporation
发明人： Atsushi Musha , So Matsuyama , Norihito Kasada
摘要： In the magnetic recording and reproducing device, a distal end width of the first magnetic pole in the recording element is substantially the same as a distal end width of the second magnetic pole; the reproducing element width of the reproducing element is equal to or less than 0.8 μm; and in the magnetic recording medium, a number distribution A of equivalent circle diameters of a plurality of bright areas in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV satisfy predetermined number distribution, respectively.
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公开(公告)号：US11423932B2
公开(公告)日：2022-08-23
申请号：US17399241
申请日：2021-08-11
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC分类号： G11B5/584 , G11B5/706 , G11B5/702 , G11B5/70 , G11B5/708 , G11B20/10 , G11B23/50 , G11B5/78 , G11B27/022 , G01B11/06 , G11B5/00 , B82Y25/00 , B82Y10/00
摘要： 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.
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公开(公告)号：US11127428B2
公开(公告)日：2021-09-21
申请号：US16777368
申请日：2020-01-30
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
摘要： 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：US11056141B2
公开(公告)日：2021-07-06
申请号：US16777312
申请日：2020-01-30
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC分类号： G11B5/78 , G11B5/584 , G11B5/706 , G11B5/702 , G11B5/708 , G11B5/70 , G11B5/39 , G11B27/022 , G11B20/10 , G11B5/00 , B82Y25/00 , B82Y10/00
摘要： The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, 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 isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less.
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公开(公告)号：US20200005814A1
公开(公告)日：2020-01-02
申请号：US16456831
申请日：2019-06-28
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa , Atsushi Musha
摘要： 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：US20210375311A1
公开(公告)日：2021-12-02
申请号：US17399241
申请日：2021-08-11
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC分类号： G11B5/584 , G11B5/706 , G11B5/702 , G11B5/70 , G11B5/708 , G11B20/10 , G11B23/50 , G11B5/78 , G11B27/022 , G01B11/06
摘要： 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.
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7.发明授权公开(公告)号：US11189308B2
公开(公告)日：2021-11-30
申请号：US16822132
申请日：2020-03-18
申请人： FUJIFILM Corporation
发明人： Atsushi Musha
摘要： A magnetic tape reading apparatus including: a reading head which includes a reading unit disposed at a position corresponding to a single track included in a magnetic tape; a controller which controls the reading unit to read data plural times from a specific range of the single track in a running direction of the magnetic tape by a linear scan method; and a synthesis unit which synthesizes a plurality of reproducing signal sequences obtained by reading data plural times from the specific range by the reading unit.
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公开(公告)号：US20210249043A1
公开(公告)日：2021-08-12
申请号：US17242798
申请日：2021-04-28
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa , Atsushi Musha
IPC分类号： G11B5/584 , G11B5/39 , G11B5/706 , G11B20/10 , G11B5/708 , G11B5/70 , G11B5/702 , G11B27/022 , G11B5/78 , G11B5/00 , B82Y10/00 , B82Y25/00
摘要： The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, 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 isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less.
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公开(公告)号：US10755735B2
公开(公告)日：2020-08-25
申请号：US16456965
申请日：2019-06-28
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC分类号： G11B5/584 , G11B5/596 , G11B5/71 , G11B15/46 , G11B5/012 , G11B5/09 , G11B5/70 , G11B5/588 , G11B5/54
摘要： A magnetic tape apparatus, in which a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an 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, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element.
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公开(公告)号：US10679655B2
公开(公告)日：2020-06-09
申请号：US16456745
申请日：2019-06-28
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
摘要： A magnetic tape apparatus, in which a magnetic tape includes a servo pattern in a magnetic layer, ΔSFD in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an 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, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer of the magnetic tape by a servo element.
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