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公开(公告)号：US11232813B2
公开(公告)日：2022-01-25
申请号：US16052817
申请日：2018-08-02
申请人： Sony Corporation
发明人： Takashi Aizawa , Atsuhiro Abe
摘要： A film-forming apparatus and a method for manufacturing a magnetic recording medium are provided. The film-forming apparatus includes a rotating body which moves a base material with a strip shape which has flexibility, a plurality of cathodes which are provided to oppose a rotating surface of the rotating body; and a plurality of accommodating sections which accommodate each of the plurality of cathodes. The method includes sequentially film-forming a plurality of thin films on a base material using a plurality of cathodes which are provided on a moving path of the base material while moving the base material with a strip shape which has flexibility. Each of the plurality of cathodes is accommodated in a plurality of accommodating sections.
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公开(公告)号：US10580447B2
公开(公告)日：2020-03-03
申请号：US15573374
申请日：2016-05-12
申请人： Sony Corporation
发明人： Noboru Sekiguchi , Tomoe Ozaki , Tetsuo Endo , Takashi Aizawa , Junichi Tachibana , Hikaru Terui , Teruo Sai
摘要： A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.
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公开(公告)号：US10311908B2
公开(公告)日：2019-06-04
申请号：US14879976
申请日：2015-10-09
申请人： Sony Corporation
发明人： Takashi Aizawa
摘要： A magnetic recording medium includes a flexible substrate, an amorphous seed layer, an under layer containing Ru, and a recording layer having a granular structure. The seed layer is provided between the substrate and the under layer. The under layer has a thickness in a range of 5 to 50 nm.
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公开(公告)号：US11468910B2
公开(公告)日：2022-10-11
申请号：US17275578
申请日：2019-08-29
申请人： Sony Corporation
发明人： Hiroto Atagi , Noboru Sekiguchi , Takashi Aizawa , Tomoe Ozaki , Koji Suzuki , Yoichi Kanemaki , Teruo Sai , Ryoichi Hiratsuka , Kazuya Hashimoto
摘要： A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 μm or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 μm or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.
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公开(公告)号：US10937457B2
公开(公告)日：2021-03-02
申请号：US16510024
申请日：2019-07-12
申请人： SONY CORPORATION
发明人： Minoru Yamaga , Noboru Sekiguchi , Tooru Sato , Takashi Aizawa
摘要： There is provided a magnetic recording medium of which an average thickness tT is tT≤5.6 μm, a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/N≤Δw, a squareness ratio in a vertical direction is 65% or more, and a width deformation coefficient b during long-term storage in a case where a long-term storage width change amount Y is defined as Y=blog(t) is −0.06 μm≤b≤0.06 μm.
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公开(公告)号：US11621020B2
公开(公告)日：2023-04-04
申请号：US16490279
申请日：2018-04-06
申请人： SONY CORPORATION
发明人： Junichi Tachibana , Takashi Aizawa , Teruo Sai , Noboru Sekiguchi , Tetsuo Endo , Tomoe Ozaki , Ryoichi Hiratsuka
摘要： A magnetic recording medium includes a flexible and elongated substrate, a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less, and a recording layer. The soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.
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公开(公告)号：US11056143B2
公开(公告)日：2021-07-06
申请号：US16703435
申请日：2019-12-04
申请人： SONY CORPORATION
发明人： Minoru Yamaga , Noboru Sekiguchi , Tooru Sato , Takashi Aizawa
摘要： A magnetic recording medium is provided and includes a magnetic layer, a non-magnetic layer, a base layer and a back layer, wherein an average thickness tT of the magnetic recording medium is tT≤5.3 μm, a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/N≤Δw, a thickness of the non-magnetic layer is 2.0 μm or less, a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more, and the magnetic layer includes a magnetic powder.
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公开(公告)号：US10789979B2
公开(公告)日：2020-09-29
申请号：US15765600
申请日：2016-11-16
申请人： SONY CORPORATION
发明人： Junichi Tachibana , Tetsuo Endo , Tomoe Ozaki , Takashi Aizawa
摘要： A magnetic recording medium includes: an elongated substrate having flexibility; a first layer, being provided on the substrate, containing Cr, Ni, and Fe, and having a face-centered cubic lattice structure with a (111) plane preferentially oriented so as to be parallel to a surface of the substrate; a second layer, being provided on the first layer, containing Co and O, having a ratio of an average atomic concentration of O to an average atomic concentration of Co of 1 or more, and having a column structure with an average particle diameter of 3 nm or more and 13 nm or less; a third layer, being provided on the second layer, and containing Ru; and a perpendicular recording layer, being provided on the third layer.
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公开(公告)号：US20160099018A1
公开(公告)日：2016-04-07
申请号：US14879976
申请日：2015-10-09
申请人： Sony Corporation
发明人： Takashi Aizawa
CPC分类号： G11B5/73 , G11B5/65 , G11B5/7315 , G11B5/732 , G11B5/7325
摘要： A magnetic recording medium includes a flexible substrate, an amorphous seed layer, an under layer containing Ru, and a recording layer having a granular structure. The seed layer is provided between the substrate and the under layer. The under layer has a thickness in a range of 5 to 50 nm.
摘要翻译： 磁记录介质包括柔性基底，无定形种子层，含有Ru的下层和具有颗粒结构的记录层。 种子层设置在基底和下层之间。 底层的厚度为5〜50nm。
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公开(公告)号：US20180137887A1
公开(公告)日：2018-05-17
申请号：US15573374
申请日：2016-05-12
申请人： Sony Corporation
发明人： Noboru Sekiguchi , Tomoe Ozaki , Tetsuo Endo , Takashi Aizawa , Junichi Tachibana , Hikaru Terui , Teruo Sai
摘要： A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 μm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.
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