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1. 发明授权

US11514942B2 Magnetic recording medium, magnetic signal reproduction device and method of manufacturing magnetic recording medium 有权
公开(公告)号：US11514942B2
公开(公告)日：2022-11-29
申请号：US17177418
申请日：2021-02-17
申请人： FUJIFILM Corporation
发明人： Masahiko Mori
IPC分类号： G11B5/708 , G11B5/70 , G11B5/68 , G11B5/735
摘要： The magnetic recording medium has a magnetic layer containing multiple nonmagnetic particles having a ratio, major axis length/minor axis length, of less than or equal to 1.5, the multiple nonmagnetic particles are present in the magnetic layer in a state where, when the depth to which each of the multiple nonmagnetic particles is embedded in the magnetic layer in observation of a sectional image picked up by SEM is denoted as b and the thickness of the magnetic layer as t, the average value of the ratio of b/t is less than or equal to 0.9, and the number of protrusions 5 nm or greater in height is 800 or greater and the number of protrusions 20 nm or greater in height is 20 or less as measured by AFM per an area 40 μm×40 μm on the magnetic layer side surface of the magnetic recording medium.

2. 发明申请

US20210174829A1 MAGNETIC RECORDING MEDIUM, MAGNETIC SIGNAL REPRODUCTION DEVICE AND METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM 有权
公开(公告)号：US20210174829A1
公开(公告)日：2021-06-10
申请号：US17177418
申请日：2021-02-17
申请人： FUJIFILM Corporation
发明人： Masahiko MORI
IPC分类号： G11B5/708 , G11B5/70 , G11B5/68
摘要： The magnetic recording medium has a magnetic layer containing multiple nonmagnetic particles having a ratio, major axis length/minor axis length, of less than or equal to 1.5, the multiple nonmagnetic particles are present in the magnetic layer in a state where, when the depth to which each of the multiple nonmagnetic particles is embedded in the magnetic layer in observation of a sectional image picked up by SEM is denoted as b and the thickness of the magnetic layer as t, the average value of the ratio of b/t is less than or equal to 0.9, and the number of protrusions 5 nm or greater in height is 800 or greater and the number of protrusions 20 nm or greater in height is 20 or less as measured by AFM per an area 40 μm×40 μm on the magnetic layer side surface of the magnetic recording medium.

3. 发明授权

US10957352B2 Magnetic recording medium, magnetic signal reproduction device and method of manufacturing magnetic recording medium 有权
公开(公告)号：US10957352B2
公开(公告)日：2021-03-23
申请号：US16259319
申请日：2019-01-28
申请人： FUJIFILM Corporation
发明人： Masahiko Mori
IPC分类号： G11B5/708 , G11B5/70 , G11B5/68
摘要： The magnetic recording medium has a magnetic layer containing multiple nonmagnetic particles having a ratio, major axis length/minor axis length, of less than or equal to 1.5, the multiple nonmagnetic particles are present in the magnetic layer in a state where, when the depth to which each of the multiple nonmagnetic particles is embedded in the magnetic layer in observation of a sectional image picked up by SEM is denoted as b and the thickness of the magnetic layer as t, the average value of the ratio of b/t is less than or equal to 0.9, and the number of protrusions 5 nm or greater in height is 800 or greater and the number of protrusions 20 nm or greater in height is 20 or less as measured by AFM per an area 40 μm×40 μm on the magnetic layer side surface of the magnetic recording medium.

4. 发明授权

US10546602B2 Magnetic tape device and reproducing method employing TMR reproducing head and tape with characterized XRD intensity ratio 有权
公开(公告)号：US10546602B2
公开(公告)日：2020-01-28
申请号：US15899587
申请日：2018-02-20
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa
IPC分类号： G11B5/78 , G11B5/39 , G11B5/02 , G11B5/73 , G11B5/706 , G11B5/596 , G11B5/70 , G11B5/708 , G11B5/68 , G11B5/74 , G11B5/008 , G11B5/845 , G11B5/584
摘要： The magnetic tape device includes a Tunneling Magnetoresistive (TMR) head as a reproducing head; and a magnetic tape which includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent on the non-magnetic support, an XRD intensity ratio (Int(110)/Int(114)) 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, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and 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.

5. 发明申请

US20180240488A1 MAGNETIC TAPE 审中-公开
公开(公告)号：US20180240488A1
公开(公告)日：2018-08-23
申请号：US15900334
申请日：2018-02-20
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
IPC分类号： G11B5/68 , G11B5/72
CPC分类号： G11B5/68 , G11B5/72 , G11B5/735 , G11B5/78
摘要： The magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which a thickness of the back coating layer is equal to or smaller than 0.30 μm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is equal to or smaller than 0.060, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the back coating layer is 15.0° to 30.0°.

6. 发明授权

US09984710B2 Magnetic tape having controlled surface properties of the backcoat and magnetic layer and method of manufacturing the same 有权
公开(公告)号：US09984710B2
公开(公告)日：2018-05-29
申请号：US15378907
申请日：2016-12-14
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
IPC分类号： G11B5/68 , G11B5/78 , G11B5/84
CPC分类号： G11B5/68 , G11B5/70 , G11B5/78 , G11B5/84
摘要： 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.

7. 发明授权

US09324350B2 High density timing based servo format for use with tilted transducer arrays 有权
标题翻译：用于倾斜传感器阵列的高密度定时伺服格式
公开(公告)号：US09324350B2
公开(公告)日：2016-04-26
申请号：US14671819
申请日：2015-03-27
申请人： GlobalFoundries U.S. 2 LLC
发明人： Robert G. Biskeborn , Mark A. Lantz
IPC分类号： G11B5/584 , G11B5/008 , G11B5/68 , G11B5/23 , G11B5/48 , G11B20/12
CPC分类号： G11B5/584 , G11B5/00817 , G11B5/00826 , G11B5/23 , G11B5/4893 , G11B5/68 , G11B20/1201
摘要： An apparatus according to one embodiment includes a magnetic head having servo writers each configured to write a servo pattern having a first magnetic bar and a third magnetic bar oriented to form a chevron-like pattern with the first magnetic bar, the first magnetic bars each having a longitudinal axis oriented at a first angle between 2 and 88 degrees from an intended direction of tape travel thereacross, the third magnetic bars each having a longitudinal axis oriented at a second angle between 2 and 88 degrees from the intended direction of tape travel thereacross, the second angle having a different numerical absolute value than the first angle. The apparatus also includes a drive mechanism for passing the magnetic recording tape over the magnetic head, and a controller electrically coupled to the magnetic head.
摘要翻译：根据一个实施例的装置包括具有伺服写入器的磁头，每个磁头被配置为写入具有第一磁条的伺服模式和第三磁性棒，以与第一磁棒形成人字形图案，第一磁条各自具有所述纵向轴线相对于预期的带状行进方向定向成2度至88度之间的第一角度，所述第三磁性棒各自具有从预期的磁带行进方向的2度到88度之间的第二角度定向的纵向轴线，所述第二角度具有与所述第一角度不同的数值绝对值。该装置还包括用于使磁记录带穿过磁头的驱动机构，以及电耦合到磁头的控制器。

8. 发明申请

US20100081011A1 MAGNETIC RECORDING MEDIUM 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20100081011A1
公开(公告)日：2010-04-01
申请号：US12569071
申请日：2009-09-29
申请人： Kenichi NAKAMURA
发明人： Kenichi NAKAMURA
IPC分类号： G11B5/68
CPC分类号： G11B5/735
摘要： A magnetic recording medium includes, in the following order: a backcoat layer; a nonmagnetic support; a nonmagnetic layer containing a nonmagnetic powder and a binder; and a magnetic layer containing a ferromagnetic powder and a binder, wherein the backcoat layer contains particles having an average primary particle size D50 of from 0.05 to 1.0 μm and forming substantially no aggregates nor agglomerates in the backcoat layer.
摘要翻译：磁记录介质按以下顺序包括：背涂层; 非磁性支撑; 含有非磁性粉末和粘合剂的非磁性层; 以及含有铁磁性粉末和粘合剂的磁性层，其中背涂层含有平均一次粒径D50为0.05-1.0μm的颗粒，并且在背涂层中基本上不形成聚集体或聚集体。

9. 发明授权

US07045228B2 Magnetic tape 有权
标题翻译：磁带
公开(公告)号：US07045228B2
公开(公告)日：2006-05-16
申请号：US11067695
申请日：2005-03-01
申请人： Minoru Kanazawa , Masami Sato
发明人： Minoru Kanazawa , Masami Sato
IPC分类号： G11B5/68
CPC分类号： G11B5/70
摘要： A magnetic tape comprising: a coating layer containing ferromagnetic powder and a binder; a support; and a back layer, in this order, which satisfies the following conditions (1) to (3): (1) on a cut plane of the tape, an apex of a biggest convexity of the support does not protrude from a line connecting an apex of a biggest convexity of the coating layer and an apex of a biggest convexity of the back layer; (2) a Young's modulus in a thickness direction of a surface of the magnetic layer is from 1,000 to 2,500 kg/mm2 (from 9.8 to 24.5 GPa); and (3) a Young's modulus in a thickness direction of a surface of the back layer is from 600 to 2,000 kg/mm2 (from 5.9 to 19.6 GPa).
摘要翻译：一种磁带，包括：包含铁磁粉末和粘合剂的涂层; 一个支持和后层，其顺序满足以下条件（1）至（3）：（1）在带的切割平面上，支撑体的最大凸度的顶点不从连接到涂层最大凸度的顶点和背层最大凸度的顶点; （2）磁性层的表面的厚度方向的杨氏模量为1000〜2500kg / mm 2（9.8〜24.5GPa）。和（3）背层表面的厚度方向的杨氏模量为600〜2000kg / mm 2（5.9〜19.6GPa）。

10. 发明申请

US20050170214A1 Magnetic recording medium and method for producing the same 审中-公开
标题翻译：磁记录介质及其制造方法
公开(公告)号：US20050170214A1
公开(公告)日：2005-08-04
申请号：US10995314
申请日：2004-11-24
申请人： Tsugihiro Doi , Tetsutaro Inoue , Hisanobu Mikamo , Seigi Kawarai , Sadamu Kuse
发明人： Tsugihiro Doi , Tetsutaro Inoue , Hisanobu Mikamo , Seigi Kawarai , Sadamu Kuse
IPC分类号： G11B5/72 , G11B5/84 , G11B5/68
CPC分类号： G11B5/8408 , G11B5/72
摘要： There is provided a magnetic recording medium comprising a flexible non-magnetic substrate, and a magnetic layer containing magnetic particles, formed on at least one surface of the flexible non-magnetic substrate, and this magnetic recording medium is characterized in that an uppermost layer formed on the side of the magnetic layer is a non-magnetic layer with a thickness of 1 to 50 nm, which contains a resin and has a surface roughness (P-V) of 2 to 20 nm. This magnetic recording medium is excellent in high density recording performance, and is highly reliable in durability.
摘要翻译：提供了一种磁性记录介质，其包括柔性非磁性基板和形成在柔性非磁性基板的至少一个表面上的含有磁性颗粒的磁性层，该磁性记录介质的特征在于形成了最上层在磁性层的一侧是厚度为1〜50nm的非磁性层，其含有树脂，表面粗糙度（PV）为2〜20nm。该磁记录介质具有优异的高密度记录性能，并且耐久性高度可靠。

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