-
公开(公告)号：US20240321309A1
公开(公告)日：2024-09-26
申请号：US18680257
申请日：2024-05-31
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
CPC分类号： G11B5/70678 , G11B5/7085 , G11B5/714 , G11B5/7356 , G11B5/78
摘要： 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
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
CPC分类号： G11B5/5928 , G11B5/70678 , G11B5/7356 , G11B5/78 , G11B15/43
摘要： 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.
-
3.发明授权公开(公告)号：US12057152B2
公开(公告)日：2024-08-06
申请号：US17186470
申请日：2021-02-26
申请人： FUJIFILM Corporation
发明人： Noriko Oyanagi , Wataru Kikuchi
IPC分类号： G11B5/008 , C10M105/54 , C10M107/38 , C10M171/00 , G11B5/706 , G11B5/73 , G11B5/735
CPC分类号： G11B5/73935 , G11B5/00813 , G11B5/70678 , G11B5/7358
摘要： The magnetic recording medium includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. An anisotropic magnetic field Hk is 12 kOe or more, a center line average roughness Ra of the surface of the magnetic recording medium on the magnetic layer side is 1.2 nm or less, and a ratio θr of a contact angle θ2 with respect to 1-bromonaphthalene, measured on a surface on the magnetic layer side after a 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion, to a contact angle θ1 with respect to 1-bromonaphthalene, measured on the surface on the magnetic layer side before the 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion is 0.95 or less.
-
4.发明公开公开(公告)号：US20240105224A1
公开(公告)日：2024-03-28
申请号：US18517870
申请日：2023-11-22
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
CPC分类号： G11B5/5928 , G11B5/70615 , G11B5/70678 , G11B5/7356
摘要： A magnetic tape in which an arithmetic average roughness Ra measured at a surface of the magnetic layer with an atomic force microscope is 2.0 nm or less, and 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 measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
-
公开(公告)号：US11869553B2
公开(公告)日：2024-01-09
申请号：US17955156
申请日：2022-09-28
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
CPC分类号： G11B5/5928 , G11B5/70615 , G11B5/70678 , G11B5/7356
摘要： A magnetic tape in which an arithmetic average roughness Ra measured at a surface of the magnetic layer with an atomic force microscope is 2.0 nm or less, and 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 measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
-
公开(公告)号：US20190027176A1
公开(公告)日：2019-01-24
申请号：US16037564
申请日：2018-07-17
申请人： FUJIFILM Corporation
发明人： Takuto KUROKAWA , Norihito KASADA , Toshio TADA , Eiki OZAWA
IPC分类号： G11B5/706
CPC分类号： G11B5/70615 , G11B5/70 , G11B5/70678 , G11B5/7085
摘要： The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.
-
公开(公告)号：US20190027171A1
公开(公告)日：2019-01-24
申请号：US16038514
申请日：2018-07-18
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
CPC分类号： G11B5/647 , G11B5/70 , G11B5/702 , G11B5/70678 , G11B5/708 , G11B5/735 , H01F1/113 , H01F1/348
摘要： The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, 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, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.
-
公开(公告)号：US20180350400A1
公开(公告)日：2018-12-06
申请号：US16100289
申请日：2018-08-10
申请人： FUJIFILM Corporation
发明人： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC分类号： G11B5/78 , G11B5/584 , G11B5/7023 , G11B5/70615 , G11B5/70678 , G11B5/714
摘要： 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：US20180286449A1
公开(公告)日：2018-10-04
申请号：US15920538
申请日：2018-03-14
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Eiki OZAWA
CPC分类号： G11B5/714 , G11B5/00813 , G11B5/3909 , G11B5/70 , G11B5/70678 , G11B5/82
摘要： The magnetic tape device includes a magnetic tape and a TMR head, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) 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, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.
-
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
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.
-
-
-
-
-
-
-
-
-
搜索结果
506 条记录 (耗时 0.026 秒)
