-
公开(公告)号：US20170372741A1
公开(公告)日：2017-12-28
申请号：US15625428
申请日：2017-06-16
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Eiki OZAWA , Norihito KASADA
Abstract: Provided is a magnetic tape in which a thickness of a back coating layer is equal to or smaller than 0.20 μm, 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 back coating layer at a photoelectron take-off angle of 10 degrees, is equal to or greater than 35 atom %, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are respectively greater than 0 nm and equal to or smaller than 10.0 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：US20170372738A1
公开(公告)日：2017-12-28
申请号：US15620916
申请日：2017-06-13
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/70605 , G11B5/00813 , G11B5/627 , G11B5/7013 , G11B5/70678 , G11B5/7085 , G11B5/71 , G11B5/735 , G11B5/78 , G11B5/8404
Abstract: Provided is a magnetic tape in which ferromagnetic powder included in a magnetic layer is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and an abrasive, 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 %, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the 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：US20170372727A1
公开(公告)日：2017-12-28
申请号：US15627696
申请日：2017-06-20
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
-
公开(公告)号：US20170221517A1
公开(公告)日：2017-08-03
申请号：US15422944
申请日：2017-02-02
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Masahito OYANAGI , Norihito KASADA
CPC classification number: G11B5/735 , G11B5/70 , G11B5/7305 , G11B5/733 , G11B5/78 , G11B5/8404 , G11B5/8412
Abstract: The magnetic tape has a magnetic layer and a backcoat layer, wherein, each of the magnetic layer and backcoat layer contains a fatty acid ester, the Ra measured on the magnetic layer side surface is less than or equal to 2.8 nm, the difference between the spacing measured by optical interferometry on the magnetic layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm, the FWHMbefore on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm, the FWHMafter on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm; and the difference between the spacing measured on the backcoat layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm.
-
公开(公告)号：US20170032812A1
公开(公告)日：2017-02-02
申请号：US15218190
申请日：2016-07-25
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/8404 , G11B5/70 , G11B5/71 , G11B5/735
Abstract: 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 magnetic layer contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide; the backcoat layer has a thickness of less than or equal to 0.30 μm and contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a magnetic layer side C—H derived C concentration is greater than or equal to 45 atom %; and a backcoat layer side C—H derived C concentration is greater than or equal to 35 atom %.
Abstract translation: 磁带具有在非磁性载体的一个表面上含有铁磁粉末和粘合剂的磁性层，并且在其另一个表面上具有含有非磁性粉末和粘合剂的背涂层，其中磁性层含有一种或多种选自 的脂肪酸和脂肪酸酰胺; 背涂层的厚度为0.30μm以下，含有选自脂肪酸和脂肪酸酰胺的一种以上成分; 磁性层侧C-H衍生C浓度大于或等于45原子％; 并且背涂层侧C-H衍生的C浓度大于或等于35原子％。
-
Patent Agency Ranking
公开(公告)号：US20130260179A1
公开(公告)日：2013-10-03
申请号：US13838996
申请日：2013-03-15
Applicant: FUJIFILM CORPORATION
Inventor： Norihito KASADA , Masahide SATO , Isamu WATANABE
CPC classification number: G11B5/7085 , G11B5/70 , G11B5/7013 , G11B5/842
Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the nonmagnetic layer has a thickness of equal to or less than 300 nm; a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; the magnetic layer comprises an abrasive with a specific surface area by BET method ranging from 14 m2/g to 40 m2/g; and a surface abrasive occupancy on a surface of the magnetic layer ranges from 0.2% to 2%.
Abstract translation: 本发明的一个方面涉及一种磁记录介质，其在非磁性载体上依次包括含有非磁性粉末和粘合剂的非磁性层和含有铁磁粉末和粘合剂的磁性层，其中非磁性层具有 等于或小于300nm的厚度; 在磁性层表面测得的复合弹性模量为6.0-8.0GPa; 磁性层包括通过BET法测量的比表面积为14m 2 / g至40m 2 / g的研磨剂; 在磁性层的表面上的表面磨料占有率为0.2％〜2％。
-
公开(公告)号：US20130084470A1
公开(公告)日：2013-04-04
申请号：US13632627
申请日：2012-10-01
Applicant: FUJIFILM CORPORATION
Inventor： Yasushi HATTORI , Ryota SUZUKI , Norihito KASADA
CPC classification number: G11B5/7013 , G11B5/70678 , G11B5/7085
Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder has a hexagonal ferrite structure, the magnetic layer comprises a coefficient of friction-lowering component in the form of nonmagnetic inorganic particles, and a compound in which a substituent selected from the group consisting of a hydroxyl group and a carboxyl group is directly substituted on an aromatic ring.
Abstract translation: 本发明的一个方面涉及一种包括在非磁性载体上含有铁磁粉末和粘合剂的磁性层的磁记录介质，其中所述铁磁性粉末具有六边形铁氧体结构，所述磁性层包括摩擦降低成分系数 非磁性无机颗粒的形式，其中选自羟基和羧基的取代基在芳环上直接取代的化合物。
-
公开(公告)号：US20240379118A1
公开(公告)日：2024-11-14
申请号：US18779785
申请日：2024-07-22
Applicant: FUJIFILM Corporation
Inventor： Toru NAKAO , Norihito KASADA , Tetsuya KANEKO , Atsushi MUSHA
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.
-
公开(公告)号：US20240321309A1
公开(公告)日：2024-09-26
申请号：US18680257
申请日：2024-05-31
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/70678 , G11B5/7085 , G11B5/714 , G11B5/7356 , G11B5/78
Abstract: Provided is a magnetic tape, in which, in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of a surface of the magnetic layer, which is measured at a tilt angle of 45° of an AlFeSil square bar, is 20 μm or more and 50 μm or less, and standard deviation of AlFeSil abrasion values of the surface of the magnetic layer, which are respectively measured at 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. The magnetic tape includes a polyethylene naphthalate support having a Young's modulus in a width direction of 10000 MPa or more.
-
公开(公告)号：US20240321303A1
公开(公告)日：2024-09-26
申请号：US18680013
申请日：2024-05-31
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/5928 , G11B5/70678 , G11B5/7356 , G11B5/78 , G11B15/43
Abstract: Provided is a magnetic tape apparatus. In a case where a maximum value of an absolute value of a difference between a servo band interval obtained before the following storage and a servo band interval obtained after the storage of N cycles, in which a predetermined storage is set as one cycle, is denoted by 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 derived from a value of A and a value of the logarithm logeT of a total storage time T of the storage of the N cycles, each of which is obtained by setting N as 1, 2, 3, 4, or 5. The medium life is T, in a case where A satisfies Expression a: A=1.5−B+C.
-
-
-
-
-
-
-
-
-
Search Results
228
records
(took 0.027 seconds)
