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公开(公告)号：US10395685B2
公开(公告)日：2019-08-27
申请号：US15920517
申请日：2018-03-14
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada
摘要： The magnetic tape device includes a TMR head (servo head); and a magnetic tape including a magnetic layer including ferromagnetic hexagonal ferrite powder, a binding agent, and fatty acid ester, in which an XRD intensity ratio obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the 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 7.0 nm, and a difference between spacings before and after the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.
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公开(公告)号：US10236025B2
公开(公告)日：2019-03-19
申请号：US15854520
申请日：2017-12-26
申请人： FUJIFILM Corporation
发明人： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
摘要： Provided are an evaluation method of a magnetic tape, in which the magnetic tape which is an evaluation target includes a magnetic layer including a servo pattern, the method including: reading the servo pattern by a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element; measuring electric resistance of the tunnel magnetoresistance effect type element after the reading; and determining quality of the magnetic tape by using a degree of a decrease in the measured electric resistance from a reference value as an index, and a manufacturing method of a magnetic tape including: evaluating the magnetic tape including a servo pattern in a magnetic layer by the evaluation method.
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公开(公告)号：US10152995B2
公开(公告)日：2018-12-11
申请号：US15920768
申请日：2018-03-14
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa
摘要： The magnetic tape device includes a magnetic tape including a magnetic layer, in which an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and 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 at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
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公开(公告)号：US20180240475A1
公开(公告)日：2018-08-23
申请号：US15900106
申请日：2018-02-20
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
CPC分类号： G11B5/71 , G11B5/00813 , G11B5/588 , G11B5/70 , G11B5/7013 , G11B5/70678 , G11B5/7085 , G11B5/7305 , G11B5/78 , G11B5/845
摘要： The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
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公开(公告)号：US09779772B1
公开(公告)日：2017-10-03
申请号：US15464991
申请日：2017-03-21
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
CPC分类号： G11B5/712 , G11B5/5926 , G11B5/70 , G11B5/78
摘要： The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein a timing based servo pattern is present on the magnetic layer, the centerline average surface roughness Ra that is measured on the surface of the magnetic layer is less than or equal to 1.8 nm, and the coefficient of friction that is measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35.
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公开(公告)号：US09530444B2
公开(公告)日：2016-12-27
申请号：US14209065
申请日：2014-03-13
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
CPC分类号： G11B5/7085 , G11B5/7013 , G11B5/70678
摘要： An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder comprising 3 to 12 weight percent of Al, based on Al2O3 conversion, relative to 100 weight percent of a total weight of the powder, the magnetic layer further comprises abrasive, and a maximum plan view surface area of the abrasive as determined for a 4.3 μm×6.3 μm rectangular region of the magnetic layer by a scanning electron microscope is less than 0.06 percent relative to 100 percent of a total surface area of the region.
摘要翻译： 本发明的一个方面涉及一种磁记录介质，其包括在非磁性载体上包含铁磁粉末和粘合剂的磁性层，其中所述铁磁粉末是基于Al 2 O 3转化率的包含3-12重量％Al的铁磁六方铁氧体粉末 相对于粉末的总重量的100重量％，磁性层还包括研磨剂，并且通过扫描电子法测定磁性层的4.3μm×6.3μm矩形区域所确定的磨料的最大平面图面积 显微镜相对于该区域的总表面积的100％小于0.06％。
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公开(公告)号：US09401171B2
公开(公告)日：2016-07-26
申请号：US13838996
申请日：2013-03-15
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Masahide Sato , Isamu Watanabe
CPC分类号： G11B5/7085 , G11B5/70 , G11B5/7013 , G11B5/842
摘要： An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the nonmagnetic layer has a thickness of equal to or less than 300 nm; a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; the magnetic layer comprises an abrasive with a specific surface area by BET method ranging from 14 m2/g to 40 m2/g; and a surface abrasive occupancy on a surface of the magnetic layer ranges from 0.2% to 2%.
摘要翻译： 本发明的一个方面涉及一种磁记录介质，其在非磁性载体上依次包括含有非磁性粉末和粘合剂的非磁性层和含有铁磁粉末和粘合剂的磁性层，其中非磁性层具有 等于或小于300nm的厚度; 在磁性层表面测得的复合弹性模量为6.0-8.0GPa; 磁性层包括通过BET法测量的比表面积为14m 2 / g至40m 2 / g的研磨剂; 在磁性层的表面上的表面磨料占有率为0.2％〜2％。
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公开(公告)号：US20160189739A1
公开(公告)日：2016-06-30
申请号：US14757555
申请日：2015-12-24
申请人： FUJIFILM CORPORATION
CPC分类号： G11B5/71 , G11B5/7305 , G11B5/78 , G11B5/8404 , G11B5/842
摘要： Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm; at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; and a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape is greater than or equal to 45 atom %.
摘要翻译： 提供了一种磁带，其在非磁性载体上包括非磁性粉末和粘合剂的非磁性层，并且在非磁性层上包括含铁磁粉末和粘合剂的磁性层; 其中所述磁带的总厚度小于或等于4.80μm; 至少磁性层包含一种或多种选自脂肪酸和脂肪酸酰胺的组分; 和C-H衍生碳C，由C-H峰面积比计算出的C-H峰面积比在通过X射线光电子能谱获得的C1s光谱中以10度的光电子取出角在磁性层侧的表面上进行 的磁带大于或等于45原子％。
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公开(公告)号：US12009017B2
公开(公告)日：2024-06-11
申请号：US17730763
申请日：2022-04-27
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Yusuke Kaneko
CPC分类号： G11B5/5928 , G11B5/70678 , G11B5/7356 , G11B5/78 , G11B23/107
摘要： In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in an environment of a temperature of 32° C. and relative humidity of 55% and a servo band spacing obtained after storage in the environment for a storage time T is set to A, and T is defined as 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours, a medium life calculated by a linear function of A and a logarithm logeT of T, that are derived from a value of A and a value of the logarithm logeT of T obtained for each T is 3 years or longer. The medium life is T in a case where the A satisfies Equation 1: A=1.5−B.
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40.发明授权公开(公告)号：US11900977B2
公开(公告)日：2024-02-13
申请号：US17955113
申请日：2022-09-28
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
CPC分类号： G11B5/70615 , G11B5/7334 , G11B5/78
摘要： A magnetic tape in which an arithmetic average roughness Ra measured at a surface of a magnetic layer with an atomic force microscope is 2.0 nm or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.
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