-
公开(公告)号：US20170372740A1
公开(公告)日：2017-12-28
申请号：US15624897
申请日：2017-06-16
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
Abstract: Provided is a magnetic tape in which the total thickness is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a magnetic layer surface Ra is equal to or smaller than 1.8 nm, the magnetic layer includes fatty acid ester, a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 7.0 nm, a full width at half maximum of spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.
-
公开(公告)号：US20170372736A1
公开(公告)日：2017-12-28
申请号：US15628814
申请日：2017-06-21
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/588 , G11B5/584 , G11B5/70 , G11B5/70678 , G11B5/7085 , G11B5/78
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support, in which the 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, 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.
-
公开(公告)号：US20170355022A1
公开(公告)日：2017-12-14
申请号：US15615871
申请日：2017-06-07
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/78 , G11B5/584 , G11B5/7023 , G11B5/70615 , G11B5/70678 , G11B5/714
Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
-
公开(公告)号：US20170053671A1
公开(公告)日：2017-02-23
申请号：US15241631
申请日：2016-08-19
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Masahito OYANAGI , Toshio TADA , Takuro SUGIYAMA
IPC: G11B5/78
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 of the nonmagnetic support, wherein the backcoat layer is less than or equal to 0.30 μm in thickness; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060.
Abstract translation: 该磁带具有在非磁性载体一侧的表面上含有铁磁性粉末和粘合剂的磁性层，并且在非磁性载体的另一侧的表面上具有含有非磁性粉末和粘合剂的背涂层，其中背涂层较少 不大于或等于0.30μm厚度; 并且通过在磁带的背涂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0.060。
-
公开(公告)号：US20150380036A1
公开(公告)日：2015-12-31
申请号：US14753227
申请日：2015-06-29
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Masahito OYANAGI , Toshio TADA
Abstract: An aspect of the present invention relates to a magnetic tape comprising a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1 ranges from 0.35 to 1.50: ΔSFD=SFD25° C.−SFD−190° C. Equation 1 wherein, in Equation 1, SFD25° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD−190° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of −190° C.
Abstract translation: 本发明的一个方面涉及一种磁带，其包括在非磁性载体上包含铁磁性粉末和粘合剂的磁性层，其中沿式（1）计算的磁带的纵向方向上的SFD范围为0.35至1.50：＆Dgr; SFD = SFD25℃-FD-190℃等式1其中，在等式1中，SFD25℃表示在温度为25°的环境中在磁带的纵向上测量的开关场分布SFD C.和SFD-190℃表示在温度为-190℃的环境中在磁带的纵向测量的开关场分布SFD。
-
Patent Agency Ranking
公开(公告)号：US20150123026A1
公开(公告)日：2015-05-07
申请号：US14529544
申请日：2014-10-31
Applicant: DOWA ELECTRONICS MATERIALS CO., LTD. , FUJIFILM Corporation
Inventor： Kenji MASADA , Hirohisa OMOTO , Futoshi NAGASHIMA , Daisuke ABE , Toshio TADA , Norihito KASADA
IPC: H01F1/03
CPC classification number: H01F1/11 , C01G49/0036 , C01P2002/76 , C01P2006/42 , G11B5/70678
Abstract: Provided is magnetic powder capable of enhancing simultaneously both magnetic characteristics including SNP and durability of a magnetic recording medium. The hexagonal ferrite magnetic powder for a magnetic recording medium has a Ba/Fe molar ratio of 8.0% or more, a Bi/Fe molar ratio of 2.5% or more and an Al/Fe molar ratio of from 3.0 to 6.0%. The magnetic powder preferably has an activation volume Vact of from 1,400 to 1,800 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 279 kA/m (which is approximately from 2,000 to 3,500 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain, as an element that substitutes an Fe site of the hexagonal ferrite, at least one kind selected from divalent transition metals M1 and tetravalent transition metals M2.
Abstract translation: 提供了能够同时提高包括SNP的磁特性和磁记录介质的耐久性的磁粉。 用于磁记录介质的六方晶系铁氧体磁粉的Ba / Fe摩尔比为8.0％以上，Bi / Fe摩尔比为2.5％以上，Al / Fe摩尔比为3.0〜6.0％。 磁性粉末优选具有1400至1800nm 3的活化体积Vact。 磁性粉末特别优选具有159至279kA / m（约2,000至3,500Oe）的矫顽力Hc和0.3至1.0的矫顽力分布SFD。 作为代替六方晶系铁氧体的Fe部位的元素，可以含有选自二价过渡金属M1和四价过渡金属M2中的至少一种。
-
公开(公告)号：US20250014604A1
公开(公告)日：2025-01-09
申请号：US18758395
申请日：2024-06-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Nobuhito ONOZUKA , Junya SAWADA , 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. Sci obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 1.40 or more and 1.60 or less, and standard deviation σ of the Sci in a width direction of the surface of the magnetic layer is 0.05 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.05)-Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 5% or more and 80% or less, and A is a measurement region area. Sci = ( Vv ( h 0.05 ) - Vv ( h 0.8 ) A ) / Sq Equation A
-
公开(公告)号：US20240221791A1
公开(公告)日：2024-07-04
申请号：US18421433
申请日：2024-01-24
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B33/04 , G11B5/7026 , G11B5/7028 , G11B5/70678 , H05K5/0217
Abstract: Provided is a magnetic tape, in which, in an environment of a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of a magnetic layer surface measured at a tilt angle of 45° of an AlFeSil square bar is 20 μm or more and 50 μm or less, standard deviation of an AlFeSil abrasion value of the magnetic layer surface measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil square bar is 30 μm or less. The tilt angle of the AlFeSil square bar is an angle formed by a longitudinal direction of the AlFeSil square bar and a width direction of the magnetic tape. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
-
公开(公告)号：US20240112697A1
公开(公告)日：2024-04-04
申请号：US18467426
申请日：2023-09-14
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Yujin SHIBATA , Norihito KASADA , So MATSUYAMA
CPC classification number: G11B5/62 , G11B5/00817 , G11B5/588 , G11B5/84
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which an AlFeSil abrasion value measured on a surface of the magnetic layer is 20 μm or more and 50 μm or less, and standard deviation a of the AlFeSil abrasion value obtained in a width direction of the surface of the magnetic layer is 5.0 μm or less.
-
公开(公告)号：US20230419993A1
公开(公告)日：2023-12-28
申请号：US18298084
申请日：2023-04-10
Applicant: FUJIFILM Corporation
Inventor： Nagisa YAMASAKI , Norihito KASADA , Yuto MURATA
CPC classification number: G11B5/5928 , G11B5/78
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. The number of recesses existing on a surface of the magnetic layer and having an equivalent circle diameter of 0.15 μm or more and 0.25 μm or less is 100 or more and 2500 or less per an area of 40 μm×40 μm. Standard deviation σ of the number of the recesses in a width direction of the surface of the magnetic layer is 100 or less.
-
-
-
-
-
-
-
-
-
Search Results
228
records
(took 0.041 seconds)
