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公开(公告)号：US20170372726A1
公开(公告)日：2017-12-28
申请号：US15621464
申请日：2017-06-13
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
CPC classification number: G11B5/71 , G11B5/00813 , G11B5/584 , G11B5/59633 , G11B5/59688 , G11B5/70 , G11B5/712 , G11B5/78
Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which a total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, one or more components selected from the group consisting of fatty acid and fatty acid amide are included in the magnetic layer, 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 equal to or greater than 45 atom %.
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公开(公告)号：US20170278533A1
公开(公告)日：2017-09-28
申请号：US15464991
申请日：2017-03-21
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
CPC classification number: G11B5/712 , G11B5/5926 , G11B5/70 , G11B5/78
Abstract: 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：US20170249963A1
公开(公告)日：2017-08-31
申请号：US15443026
申请日：2017-02-27
Applicant: FUJIFILM Corporation
Inventor： Masahito OYANAGI , Norihito KASADA , Takuto KUROKAWA
CPC classification number: G11B5/71 , G11B5/702 , G11B5/7085 , G11B5/7305 , G11B5/733 , G11B5/735 , G11B5/78
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder, abrasive, and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra measured on the surface of the magnetic layer is less than or equal to 1.8 nm, the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 60.0°, 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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224.发明申请公开(公告)号：US20170178676A1
公开(公告)日：2017-06-22
申请号：US15380336
申请日：2016-12-15
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer; wherein the combined thickness of the nonmagnetic layer and the magnetic layer is less than or equal to 0.60 μm, the coefficient of friction as measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35, at least the magnetic layer contains 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 the surface of the magnetic layer is greater than or equal to 45 atom %.
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Patent Agency Ranking
公开(公告)号：US20170178675A1
公开(公告)日：2017-06-22
申请号：US15378907
申请日：2016-12-14
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side thereof, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, 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 logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side is less than or equal to 0.060.
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公开(公告)号：US20170053670A1
公开(公告)日：2017-02-23
申请号：US15241297
申请日：2016-08-19
Applicant: FUJIFILM Corporation
Inventor： Masahito OYANAGI , Norihito KASADA , Toshio TADA , Takuro SUGIYAMA
IPC: G11B5/78
CPC classification number: G11B5/78 , G11B5/70 , G11B5/7085 , G11B5/842
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, 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.
Abstract translation: 磁带具有在非磁性载体上含有铁磁粉末和粘合剂的磁性层，其中在磁带的磁性层一侧的表面上测量的中心线平均表面粗糙度Ra小于或等于1.8nm，而对数 通过在磁带的磁性层一侧的表面上的摆式粘弹性测试确定的减量小于或等于0.050。
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公开(公告)号：US20160276076A1
公开(公告)日：2016-09-22
申请号：US15072550
申请日：2016-03-17
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
IPC: H01F1/11
CPC classification number: G11B5/7085 , G11B5/7013 , G11B5/70678 , H01F1/113
Abstract: The magnetic tape includes a magnetic layer containing ferromagnetic hexagonal ferrite powder, abrasive, and binder on a nonmagnetic support, wherein the ferromagnetic hexagonal ferrite powder exhibits an activation volume of less than or equal to 1,800 nm3, and inclination, cos θ, of the ferromagnetic hexagonal ferrite powder relative to a surface of the magnetic layer as determined by sectional observation by a scanning electron transmission microscope is greater than or equal to 0.85 but less than or equal to 1.00.
Abstract translation: 磁带包括在非磁性载体上含有铁磁六角铁氧体粉末，研磨剂和粘合剂的磁性层，其中铁磁性六角铁氧体粉末显示小于或等于1,800nm 3的活化体积和铁磁性的倾斜度cosθ 通过扫描电子透射显微镜的截面观察确定的相对于磁性层的表面的六方铁素体粉末大于或等于0.85但小于等于1.00。
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公开(公告)号：US20160247530A1
公开(公告)日：2016-08-25
申请号：US15052115
申请日：2016-02-24
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/735 , G11B5/70 , G11B5/70605 , G11B5/8404
Abstract: The magnetic tape has on one surface of a nonmagnetic support a magnetic layer containing ferromagnetic powder and binder, and on the other surface of the nonmagnetic support, a backcoat layer containing nonmagnetic powder and binder, wherein the total thickness of the magnetic tape is less than or equal to 4.80 μm, the backcoat layer contains 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 backcoat layer side of the magnetic tape ranges from 35 to 60 atom %.
Abstract translation: 磁带在非磁性载体的一个表面上具有含有铁磁粉末和粘合剂的磁性层，而在非磁性载体的另一个表面上，包含非磁性粉末和粘合剂的背涂层，其中磁带的总厚度小于 或等于4.80μm，背涂层含有一种或多种选自脂肪酸和脂肪酸酰胺的组分和C-H衍生的碳，C，由C-H峰面积比计算的浓度 在磁带的背涂层侧的表面上以10度的光电子取出角进行的X射线光电子能谱得到的C1s光谱的范围为35〜60原子％。
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公开(公告)号：US20160093322A1
公开(公告)日：2016-03-31
申请号：US14867752
申请日：2015-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Masahito OYANAGI , Toshio TADA , Yasuhiro KAWATANI
Abstract: The magnetic tape comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm, and a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35.
Abstract translation: 该磁带在非磁性载体上包含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有铁磁粉末，非磁性粉末和粘合剂的磁性层，其中磁带的总厚度小于或等于 等于4.80μm，并且在磁性层的表面的基部上测量的摩擦系数小于或等于0.35。
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