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公开(公告)号：US20240355357A1
公开(公告)日：2024-10-24
申请号：US18757992
申请日：2024-06-28
CPC分类号： G11B5/73921 , G11B5/7358
摘要： A magnetic disk substrate having a pair of front and back principal surfaces, containing fixed portions that are in contact with fixing jigs when the magnetic disk substrate configured as a magnetic disk is incorporated in a hard disk device on the respective front and back principal surfaces, wherein a root mean square deviation Rq of surface roughnesses of the fixed portions on the respective front and back principal surfaces is from 0.01 to 0.44 μm.; and
a magnetic disk using the same.-
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.
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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.
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4.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.
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5.发明公开公开(公告)号：US20240170014A1
公开(公告)日：2024-05-23
申请号：US18524922
申请日：2023-11-30
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
CPC分类号： G11B5/7334 , G11B5/708 , G11B5/7356 , G11B5/78
摘要： A magnetic tape in which an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 μm or less, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.
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6.发明公开公开(公告)号：US20240105228A1
公开(公告)日：2024-03-28
申请号：US18524724
申请日：2023-11-30
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
CPC分类号： G11B5/7028 , G11B5/708 , G11B5/71 , G11B5/7356 , G11B5/78
摘要： A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.
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7.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.
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公开(公告)号：US11887637B2
公开(公告)日：2024-01-30
申请号：US17955251
申请日：2022-09-28
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
CPC分类号： G11B5/7028 , G11B5/708 , G11B5/71 , G11B5/7356 , G11B5/78
摘要： A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.
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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.
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公开(公告)号：US20230335160A1
公开(公告)日：2023-10-19
申请号：US18299289
申请日：2023-04-12
申请人： FUJIFILM Corporation
发明人： Yuto MURATA , Norihito KASADA , Nagisa YAMASAKI
CPC分类号： G11B5/7356 , G11B5/78 , G11B20/20
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a non-linear component of tape width deformation generated by storage for 10 days in an environment of a temperature of 60° C. and a relative humidity of 20% is 100 nm or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
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