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公开(公告)号：US20150279402A1
公开(公告)日：2015-10-01
申请号：US14666581
申请日：2015-03-24
申请人： Sony Corporation
发明人： Noboru SEKIGUCHI , Junichi TACHIBANA , Tetsuo ENDO , Tomoe OZAKI , Hikaru TERUI
CPC分类号： G11B5/667 , G11B5/64 , G11B5/7325 , G11B5/738 , G11B5/851
摘要： A magnetic recording medium includes a base material which has flexibility, a lower coating layer, and a recording layer, in which, in X-ray diffraction peaks, a value of Δθ50 where a diffraction peak of magnetic atoms which are included in the recording layer is measured by a locking curve method is 5° or more to less than 10°.
摘要翻译： 磁记录介质包括具有柔性的基材，下涂层和记录层，其中在X射线衍射峰中具有包含的磁性原子的衍射峰值 在记录层中通过锁定曲线法测量的是5°以上至小于10°。
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公开(公告)号：US20220108723A1
公开(公告)日：2022-04-07
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：US20210151075A1
公开(公告)日：2021-05-20
申请号：US17156136
申请日：2021-01-22
申请人： Sony Corporation
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： A magnetic recording medium is provided and includes a substrate; and a magnetic layer provided over the substrate, wherein (wmax−wmin)/wmin≤400 [ppm] . . . (1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch, magnetic recording medium has Young's modulus of less than 8.0 GPa in a longitudinal direction, and 4.0≤TB/(TA−TB) . . . (2) where TA is average thickness of magnetic recording medium and TB is average thickness of substrate.
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公开(公告)号：US20150194174A1
公开(公告)日：2015-07-09
申请号：US14568423
申请日：2014-12-12
申请人： Sony Corporation
发明人： Noboru SEKIGUCHI , Tomoe OZAKI , Junichi TACHIBANA
摘要： There is provided a magnetic recording medium including a surface having a longitudinal direction and a lateral direction. An arithmetic average roughness Ra, a ratio PSDMD,short/PSDTD,short, and a ratio PSDMD,long/PSDTD,long on the surface satisfy Ra≦3.0 nm, PSDMD,short/PSDTD,short≦0.65, and 1.3≦PSDMD,long/PSDTD,long≦2.3, in which PSDMD,short is an average value of PSD values in a range from 0.15 μm to 0.4 μm in the longitudinal direction of the surface, PSDTD,short is an average value of PSD values in a range from 0.15 μm to 0.4 μm in the lateral direction of the surface, PSDMD,long is an average value of PSD values in a range from 0.4 μm to 5.0 μm in the longitudinal direction of the surface, and PSDTD,long is an average value of PSD values in a range from 0.4 μm to 5.0 μm in the lateral direction of the surface.
摘要翻译： 提供了包括具有纵向和横向的表面的磁记录介质。 表面上的算术平均粗糙度Ra，比率PSDMD，短/ PSDTD，短和比PSDID，长/ PSDTD长，满足Ra＆nlE; 3.0nm，PSDMD，short / PSDTD，short＆nlE; 0.65和1.3＆nlE; PSDMD 长/ PSDTD，long＆nlE; 2.3，其中PSDMD是表面纵向方向上0.15μm至0.4μm范围内的PSD值的平均值，PSDTD，short是PSDTD中PSD值的平均值 在表面的横向方向为0.15μm〜0.4μm的范围，PSDMD长为在表面的长度方向上的0.4μm〜5.0μm的范围内的PSD值的平均值，PSDTD，long是平均值 的PSD值在表面的横向方向上在0.4μm至5.0μm的范围内。
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公开(公告)号：US20200342907A1
公开(公告)日：2020-10-29
申请号：US16502418
申请日：2019-07-03
申请人： Sony Corporation
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： A magnetic recording cartridge includes 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 tension change in a longitudinal direction is 660 ppm/N≤Δw, and a squareness ratio in a vertical direction is 65% or more, in which the magnetic recording medium is accommodated in a state of being wound around a reel and (a servo track width on an inner side of winding of the magnetic recording medium)−(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied.
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公开(公告)号：US20200312365A1
公开(公告)日：2020-10-01
申请号：US16454878
申请日：2019-06-27
申请人： SONY CORPORATION
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： A magnetic recording medium includes a layer structure including a magnetic layer, a base layer, and a back layer in this order, in which an average thickness tT is tT≤5.5 μm, a dimensional variation Δw in a width direction to tension change in a longitudinal direction is 660 ppm/N≤Δw, and a surface roughness Rabe of the base layer on a side of the back layer is 4.2 nm≤Rabe≤8.5 nm.
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公开(公告)号：US20200312358A1
公开(公告)日：2020-10-01
申请号：US16455132
申请日：2019-06-27
申请人： Sony Corporation
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： In a magnetic recording medium, an average thickness tT is tT≤5.5 μm, a dimensional variation Δw in a width direction to tension change in a longitudinal direction is 650 ppm/N≤Δw, and a rate of shrinkage in the longitudinal direction is 0.08% or less.
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公开(公告)号：US20210407540A1
公开(公告)日：2021-12-30
申请号：US16474437
申请日：2018-11-26
申请人： Sony Corporation
发明人： Noboru SEKIGUCHI , Minoru YAMAGA
摘要： A magnetic recording medium is a magnetic recording medium having a tape-like shape and includes a base substrate and a magnetic layer provided on the base substrate. A plurality of data tracks can be formed in the magnetic layer, a width of a data track is 2900 nm or less, and in a case of defining, as wmax and wmin, a maximum value and a minimum value respectively out of average values of a width of the magnetic recording medium measured under four kinds of environment in which temperature and relative humidity are set to (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), wmax and wmin satisfy a relation of (wmax−wmin)/wmin≤400 [ppm].
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公开(公告)号：US20210174830A1
公开(公告)日：2021-06-10
申请号：US17156064
申请日：2021-01-22
申请人： Sony Corporation
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： A magnetic recording medium is provided and includes
a substrate; a magnetic layer; an underlayer between the substrate and the magnetic layer; and a back layer, wherein (wmax−wmin)/wmin≤400 [ppm] (1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch.-
公开(公告)号：US20200342908A1
公开(公告)日：2020-10-29
申请号：US16883194
申请日：2020-05-26
申请人： Sony Corporation
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： A magnetic recording cartridge is provided and including a magnetic recording medium, wherein an average thickness of the magnetic recording medium tT is 3.5 μm≤tT ≤5.6 μm, a dimensional change amount Δw in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N≤Δw ≤20000 ppm, the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and (a servo track width on an inner side of winding of the magnetic recording medium)-(a servo track width on an outer side of winding of the magnetic recording medium) > is satisfied, and a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more.
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