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1. 发明申请

US20190088278A1 MAGNETIC TAPE DEVICE AND HEAD TRACKING SERVO METHOD 审中-公开
公开(公告)号：US20190088278A1
公开(公告)日：2019-03-21
申请号：US16182083
申请日：2018-11-06
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Eiki OZAWA
IPC分类号： G11B5/714 , G11B5/70 , G11B5/71 , G11B5/706 , G11B5/39 , G11B5/008 , G11B5/584
CPC分类号： G11B5/714 , G11B5/00813 , G11B5/3909 , G11B5/584 , G11B5/70 , G11B5/70615 , G11B5/71
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 %.

2. 发明申请

US20180286444A1 MAGNETIC TAPE DEVICE, MAGNETIC REPRODUCING METHOD, AND HEAD TRACKING SERVO METHOD 审中-公开
公开(公告)号：US20180286444A1
公开(公告)日：2018-10-04
申请号：US15920782
申请日：2018-03-14
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Eiki OZAWA
IPC分类号： G11B5/706 , G11B5/584 , G11B5/008
CPC分类号： G11B5/70626 , G11B5/00817 , G11B5/584 , G11B5/70 , G11B5/70615 , G11B5/71
摘要： Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, 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 %, and ΔSFD (=SFD25° C.−SFD−190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD25° C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD−19° C. being SFD measured at a temperature of −190° C.

3. 发明申请

US20180240475A1 MAGNETIC TAPE 审中-公开
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
IPC分类号： G11B5/008 , G11B5/73 , G11B5/588 , G11B5/706 , G11B5/708 , G11B5/70
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.

4. 发明申请

US20180233166A1 HEAT-ASSISTED REMOVAL OF HEAD CONTAMINATION 审中-公开
公开(公告)号：US20180233166A1
公开(公告)日：2018-08-16
申请号：US15865201
申请日：2018-01-08
申请人： Seagate Technology LLC
发明人： John L. BRAND , James D. KIELY
IPC分类号： G11B5/31 , G11B5/667 , G11B5/82 , G11B5/00
CPC分类号： G11B5/3133 , G11B5/3116 , G11B5/3146 , G11B5/41 , G11B5/667 , G11B5/71 , G11B5/725 , G11B5/82 , G11B2005/0021
摘要： Provided herein is a magnetic write head including a near field transducer and a magnetic recording media including a media lubricant. The media lubricant includes a first portion and a second portion. The second portion of the media lubricant is evaporated in response to heat emitted from the near field transducer. The second portion of the media lubricant that is evaporated removes a contaminant over the near field transducer.

5. 发明申请

US20170358318A1 MAGNETIC TAPE AND MAGNETIC TAPE DEVICE 审中-公开
公开(公告)号：US20170358318A1
公开(公告)日：2017-12-14
申请号：US15614876
申请日：2017-06-06
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
IPC分类号： G11B5/008 , G11B5/78 , G11B5/584
CPC分类号： G11B5/71 , G11B5/00813 , G11B5/584 , G11B5/70 , G11B5/78
摘要： The magnetic tape includes a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which 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 at least 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 %.

6. 发明申请

US20170287518A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM COMPOSITION 审中-公开
公开(公告)号：US20170287518A1
公开(公告)日：2017-10-05
申请号：US15474504
申请日：2017-03-30
申请人： FUJIFILM Corporation
发明人： Toshihide AOSHIMA , Mika IMAMURA , Shinji TSUJIMOTO
IPC分类号： G11B5/71 , C08K3/22 , G11B5/702 , C08K5/101
CPC分类号： G11B5/71 , C08K3/22 , C08K5/101 , C08K2003/2272 , G11B5/7021 , G11B5/7023 , G11B5/714
摘要： The magnetic recording medium contains, in a magnetic layer, a fatty acid ester and a polyester resin having a number average molecular weight of greater than or equal to 1,000 but less than 20,000, and containing a structural unit derived from a polyvalent carboxylic acid and a structural unit derived from a polyol, as well as 10 mol % to 50 mol % of a structural unit, derived from a cyclic polyvalent carboxylic acid selected from the group consisting of an alicyclic polyvalent carboxylic acid and an aromatic polyvalent carboxylic acid, per 100 mol % of a combined total of the above structural units, and one or more partial structures selected from the group consisting of the following partial structures: wherein each of L1 and L2 independently denotes a divalent connecting group, and each of Z1 and Z2 independently denotes a monovalent group denoted by —OM or a monovalent group denoted by —O−A+.

7. 发明申请

US20170249964A1 MAGNETIC TAPE 审中-公开
公开(公告)号：US20170249964A1
公开(公告)日：2017-08-31
申请号：US15442961
申请日：2017-02-27
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Takuto KUROKAWA , Masahito OYANAGI
IPC分类号： G11B5/73 , G11B5/706 , G11B5/725 , G11B5/733 , G11B5/735 , G11B5/78 , G11B5/71
CPC分类号： G11B5/7305 , G11B5/702 , G11B5/706 , G11B5/71 , G11B5/725 , G11B5/733 , G11B5/735 , G11B5/78
摘要： The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.

8. 发明申请

US20160189739A1 Magnetic tape and method of manufacturing the same 有权
标题翻译：磁带及其制造方法
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
发明人： Norihito Kasada , Masahito Oyanagi , Toshio Tada , Kazuyuki Kitada
IPC分类号： G11B5/71 , G11B5/733 , G11B5/842 , G11B5/738 , G11B5/78 , G11B5/84 , G11B5/73 , G11B5/735
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％。

9. 发明申请

US20160180875A1 MAGNETIC RECORDING MEDIUM 有权
标题翻译：磁记录介质
公开(公告)号：US20160180875A1
公开(公告)日：2016-06-23
申请号：US15054887
申请日：2016-02-26
申请人： HITACHI MAXELL, LTD.
发明人： Kenji TANAKA , Masao FUJITA , Sadamu KUSE
IPC分类号： G11B5/71 , G11B5/78 , G11B5/706
CPC分类号： G11B5/71 , G11B5/70615 , G11B5/70626 , G11B5/714 , G11B5/738 , G11B5/78
摘要： A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.
摘要翻译：本发明的磁记录介质是包括非磁性基片的磁记录介质; 非磁性层，其形成在所述非磁性基板的一个主表面上并且包含非磁性粉末，粘合剂和润滑剂; 以及形成在与非磁性基板相对的非磁性层的主表面上并且包含磁性粉末和粘合剂的磁性层。磁性粉末的平均粒径为10nm〜35nm。当向磁性层施加压力时，润滑剂可移动到磁性层并在磁性层的表面上形成润滑剂层。当使用TSA（胶带间隔分析仪）测量用正己烷洗涤润滑剂之前和之后的磁性层表面的间隔时，洗涤后的间隔值为3至10nm，并且之前的间隔值洗涤比洗涤后的间隔值小1〜5nm。

10. 发明申请

US20090087685A1 MAGNETIC RECORDING MEDIUM 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20090087685A1
公开(公告)日：2009-04-02
申请号：US12240089
申请日：2008-09-29
申请人： Tomohiro ICHIKAWA , Mikio OHNO
发明人： Tomohiro ICHIKAWA , Mikio OHNO
IPC分类号： G11B5/68 , G11B5/70
CPC分类号： G11B5/70 , G11B5/71
摘要： The magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. The magnetic layer has an average surface roughness Ra, measured by an atomic force microscope, ranging from 2.0 to 3.5 nm and an indentation hardness ranging from 0.49 GPa to 0.78 GPa, as well as further comprises a carbonic ester having a molecular weight of 360 to 460 that is denoted by general formula (1). In general formula (1), R1 denotes a saturated hydrocarbon group having a branched structure, and R2 denotes a saturated hydrocarbon group having a linear structure with 14 to 20 carbon atoms.
摘要翻译：磁记录介质包括在非磁性载体上包含铁磁粉末和粘合剂的磁性层。磁性层具有由原子力显微镜测得的平均表面粗糙度Ra为2.0-3.5nm，压痕硬度为0.49GPa至0.78GPa，还包括分子量为360至 460，由通式（1）表示。在通式（1）中，R 1表示具有支链结构的饱和烃基，R 2表示具有14〜20个碳原子的直链结构的饱和烃基。

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