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公开(公告)号：US20210398554A1
公开(公告)日：2021-12-23
申请号：US17353820
申请日：2021-06-22
申请人： FUJIFILM Corporation
摘要： A signal processing device includes a receiver that receives a plurality of playback signal sequence obtained by digitizing a plurality of reading results by a plurality of A/D converter, the plurality of reading results being obtained by reading data by a plurality of reading elements from a magnetic tape and a plurality of equalizers that perform waveform equalization of the plurality of playback signal sequence. The plurality of equalizers perform the waveform equalization by using a plurality of non-linear filters that have been learned to reduce distortion that occurs non-linearly in the plurality of playback signal sequence according to a condition under an environment in which the data is read from the magnetic tape. The plurality of non-linear filters being optimized to a suitable characteristic for the plurality of reading elements by optimization based on the plurality of reading results.
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公开(公告)号：US20200251138A1
公开(公告)日：2020-08-06
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：US20200005828A1
公开(公告)日：2020-01-02
申请号：US16456459
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 full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of a magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 15.0 nm, a difference between spacings measured by optical interferometry regarding the surface of the magnetic layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm, 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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4.发明公开公开(公告)号：US20230154494A1
公开(公告)日：2023-05-18
申请号：US18158048
申请日：2023-01-23
申请人： FUJIFILM Corporation
发明人： Toru NAKAO , Norihito KASADA , Tetsuya KANEKO , Atsushi MUSHA
IPC分类号： G11B15/43
CPC分类号： G11B15/43
摘要： Provided is a magnetic tape cartridge including: a case in which a magnetic tape is accommodated; and a storage medium provided in the case, in which the storage medium stores tension allowable range related information regarding an allowable range of tension applied to the magnetic tape.
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公开(公告)号：US20210233563A1
公开(公告)日：2021-07-29
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. w
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6.发明申请公开(公告)号：US20200312356A1
公开(公告)日：2020-10-01
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：US20200005820A1
公开(公告)日：2020-01-02
申请号：US16456965
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 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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8.发明公开公开(公告)号：US20230206948A1
公开(公告)日：2023-06-29
申请号：US18170683
申请日：2023-02-17
申请人： FUJIFILM Corporation
发明人： Toru NAKAO , Norihito Kasada , Tetsuya KANEKO , Atsushi MUSHA
IPC分类号： G11B5/584 , G11B23/027 , G11B15/43
CPC分类号： G11B5/584 , G11B23/027 , G11B15/43
摘要： 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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9.发明公开公开(公告)号：US20230186944A1
公开(公告)日：2023-06-15
申请号：US18163606
申请日：2023-02-02
申请人： FUJIFILM Corporation
发明人： Toru NAKAO , Norihito KASADA , Tetsuya KANEKO , Atsushi MUSHA
CPC分类号： G11B5/00813 , G11B5/78
摘要： 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：US20210287702A1
公开(公告)日：2021-09-16
申请号：US17329275
申请日：2021-05-25
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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