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公开(公告)号：US20210398555A1
公开(公告)日：2021-12-23
申请号：US17338688
申请日：2021-06-04
申请人： FUJIFILM Corporation
发明人： So MATSUYAMA , Norihito KASADA , Takuto KUROKAWA
摘要： The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 μm to 0.8 μm. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 μm to 0.50 μm, is 10 to 500 per area of 40 μm×40 μm.
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公开(公告)号：US20210383827A1
公开(公告)日：2021-12-09
申请号：US17338694
申请日：2021-06-04
申请人： FUJIFILM Corporation
发明人： So MATSUYAMA , Norihito KASADA , Takuto KUROKAWA
摘要： The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.2 μm or greater and less than 0.5 μm. In the magnetic recording medium, the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 μm or greater and less than 0.20 μm, is 100 to 2,000 per area of 40 μm×40 μm.
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公开(公告)号：US20210233565A1
公开(公告)日：2021-07-29
申请号：US17155695
申请日：2021-01-22
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , So MATSUYAMA , Atsushi MUSHA , Shota KAMIMURA
摘要： In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.
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公开(公告)号：US20200312362A1
公开(公告)日：2020-10-01
申请号：US16830752
申请日：2020-03-26
申请人： FUJIFILM Corporation
发明人： Wataru KIKUCHI , So MATSUYAMA
摘要： The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the magnetic layer includes a compound having a salt structure, and the salt structure is an ammonium salt structure of an alkyl ester anion represented by the following Formula 1. In Formula 1, R represents an alkyl group having 7 or more carbon atoms or a fluorinated alkyl group having 7 or more carbon atoms, Z+ represents an ammonium cation, and a water contact angle on a surface of the magnetic layer is 80° or more and less than 100°. A magnetic recording and reproducing apparatus includes the magnetic recording medium.
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公开(公告)号：US20240105223A1
公开(公告)日：2024-03-28
申请号：US18467336
申请日：2023-09-14
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Yujin SHIBATA , Takuto KUROKAWA , So MATSUYAMA
CPC分类号： G11B5/584 , G11B5/7021 , G11B5/70678 , G11B5/714 , G11B5/78 , G11B15/43
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with 1-bromonaphthalene, which is measured on a surface of the magnetic layer, is 45.0° or more and 55.0° or less, and standard deviation σ of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.
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公开(公告)号：US20240096365A1
公开(公告)日：2024-03-21
申请号：US18467585
申请日：2023-09-14
申请人： FUJIFILM Corporation
发明人： So MATSUYAMA , Takuto KUROKAWA , Norihito KASADA , Yujin SHIBATA
CPC分类号： G11B5/70615 , G11B5/00817 , G11B5/588
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with water, which is measured on a surface of the magnetic layer, is 95° or more and 105° or less, and standard deviation a of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.
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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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公开(公告)号：US20240212710A1
公开(公告)日：2024-06-27
申请号：US18538634
申请日：2023-12-13
申请人： FUJIFILM Corporation
发明人： So MATSUYAMA
CPC分类号： G11B5/78 , G11B5/00817 , G11B5/7356 , G11B5/7369 , G11B2220/956
摘要： The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. 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, the number of bright regions having an equivalent circle diameter of 75 nm or more and less than 125 nm is 100 or more and 4000 or less, and standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 400 or less.
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公开(公告)号：US20240112698A1
公开(公告)日：2024-04-04
申请号：US18460081
申请日：2023-09-01
申请人： FUJIFILM Corporation
发明人： Yujin SHIBATA , Norihito KASADA , Takuto KUROKAWA , So MATSUYAMA
CPC分类号： G11B5/70678 , G11B5/714 , G11B5/7358
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which an arithmetic average roughness Ra measured on a surface of the magnetic layer is 1.5 nm or less, and standard deviation a of the Ra in a width direction of the surface of the magnetic layer is 0.20 nm or less.
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公开(公告)号：US20230099064A1
公开(公告)日：2023-03-30
申请号：US17953149
申请日：2022-09-26
申请人： FUJIFILM Corporation
发明人： Yujin SHIBATA , Norihito KASADA , Takuto KUROKAWA , So MATSUYAMA
摘要： The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, in which an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less, a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.
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