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公开(公告)号：US20170053669A1
公开(公告)日：2017-02-23
申请号：US15241286
申请日：2016-08-19
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
IPC: G11B5/78
CPC classification number: G11B5/78 , G11B5/70 , G11B5/7085 , G11B5/842
Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and has a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein the combined thickness of the magnetic layer and the nonmagnetic layer is less than or equal to 0.80 μm; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050 and the coefficient of friction as measured on a base portion of the surface on the magnetic layer side is less than or equal to 0.35.
Abstract translation: 磁带在非磁性载体上具有含有非磁性粉末和粘合剂的非磁性层，并且在非磁性层上具有含有铁磁粉末和粘合剂的磁性层，其中磁性层和非磁性层的组合厚度小于或等于 0.80μm; 并且通过在磁带的磁性层侧的表面上的摆式粘弹性试验确定的对数减量小于或等于0.050，并且在磁性层一侧的表面的基部上测量的摩擦系数为 小于或等于0.35。
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公开(公告)号：US20170004856A1
公开(公告)日：2017-01-05
申请号：US15197046
申请日：2016-06-29
Applicant: FUJIFILM Corporation
Inventor： Toshio TADA , Akinori SUGISHIMA , Tatsuya YAMASHITA , Norihito KASADA , Masahito OYANAGI
CPC classification number: G11B5/842 , G11B5/70678 , G11B5/714
Abstract: The magnetic recording medium has a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1.
Abstract translation: 磁记录介质具有在非磁性载体上含有铁磁性粉末和粘合剂的磁性层，其中铁磁性粉末为铁磁性六角铁氧体粉末，铁磁性六方晶系铁氧体粉末的X射线衍射分析的微晶体积为1000nm 3 至（2,400nm 3），通过透射电子显微镜观察确定由（107）面的衍射峰获得的微晶尺寸Dx（107）与易磁化轴DTEM方向上的粒径的比例， Dx（107）/ DTEM，大于或等于1.1。
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公开(公告)号：US20160189740A1
公开(公告)日：2016-06-30
申请号：US14978834
申请日：2015-12-22
Applicant: FUJIFILM Corporation
Inventor： Masahito OYANAGI , Norihito KASADA , Toshio TADA , Kazuyuki KITADA
CPC classification number: G11B5/71 , G11B5/70 , G11B5/7305 , G11B5/78 , G11B5/8404 , G11B5/842
Abstract: 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 at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a quantity of components selected from the group consisting of a fatty acid and a fatty acid amide per unit area of the magnetic tape among components that are extracted from a surface on the magnetic layer side of the magnetic tape is less than or equal to 15.0 mg/m2, and a concentration of carbon, C, that is obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface on the magnetic layer side of the magnetic tape is greater than or equal to 50 atom %.
Abstract translation: 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; 其中至少所述磁性层包含一种或多种选自脂肪酸和脂肪酸酰胺的组分; 在从磁带的磁性层一侧的表面提取的成分中，选自由磁带的每单位面积的脂肪酸和脂肪酸酰胺组成的组中的成分的量少于或等于15.0mg / m 2，通过在磁带的磁性层一侧的表面上以10度的光电子起飞角度进行的通过X射线光电子能谱得到的碳浓度C大于或等于50 原子％。
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公开(公告)号：US20140272474A1
公开(公告)日：2014-09-18
申请号：US14209065
申请日：2014-03-13
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/7085 , G11B5/7013 , G11B5/70678
Abstract: 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.
Abstract translation: 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：US20250006225A1
公开(公告)日：2025-01-02
申请号：US18759153
申请日：2024-06-28
Applicant: FUJIFILM Corporation
Inventor： Junya SAWADA , Norihito KASADA , Nobuhito ONOZUKA , Ryosuke YUMIYAMA
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A dale void volume Vvv specified in ISO 25178 on a surface of the magnetic layer is 0.100 nm3 or more and 0.350 nm3 or less, and standard deviation a of the Vvv in a width direction of the surface of the magnetic layer is 0.020 nm3 or less.
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Patent Agency Ranking
公开(公告)号：US20240355355A1
公开(公告)日：2024-10-24
申请号：US18680136
申请日：2024-05-31
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/5928 , G11B5/70678 , G11B5/714 , G11B5/7356 , G11B5/78
Abstract: Provided is a magnetic tape, in which, in an environment of a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on a magnetic layer surface with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf or more and 15 gf or less, and standard deviation of a frictional force F on the magnetic layer surface with respect to the LTO8 head respectively measured at head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less. The magnetic tape includes a polyethylene naphthalate support having a Young's modulus in a width direction of 10000 MPa or more.
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公开(公告)号：US20240321302A1
公开(公告)日：2024-09-26
申请号：US18679814
申请日：2024-05-31
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/588 , G11B5/00817
Abstract: Provided is a magnetic tape apparatus. A maximum value of an absolute value of a difference between a servo band interval obtained before storage in a predetermined environment and a servo band interval obtained after storage for a storage time T in the above-described environment is defined as A, and a medium life is equal to or longer than 5 years, which is calculated by a linear function of A and a logarithm logeT of T, which are derived from a value of A and a value of the logarithm logeT of T, each of which is obtained by setting T as a plurality of predetermined times. The medium life is T in a case where A satisfies a predetermined equation. The magnetic tape includes a polyethylene naphthalate support having a Young's modulus in the width direction, which is equal to or more than 10000 MPa.
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178.发明公开公开(公告)号：US20240177734A1
公开(公告)日：2024-05-30
申请号：US18524342
申请日：2023-11-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/7334 , G11B5/78
Abstract: A magnetic tape in which a vertical switching field distribution SFD of the magnetic tape is 1.5 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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179.发明公开公开(公告)号：US20240105227A1
公开(公告)日：2024-03-28
申请号：US18524221
申请日：2023-11-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yuto MURATA , Nagisa YAMASAKI
CPC classification number: G11B5/70 , G11B5/00813 , G11B5/00826 , G11B5/4893 , G11B5/00856 , G11B5/7356
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. 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 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
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180.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
Applicant: FUJIFILM Corporation
Inventor： Toru NAKAO , Norihito KASADA , Tetsuya KANEKO , Atsushi MUSHA
CPC classification number: G11B5/00813 , G11B5/78
Abstract: 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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