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91.发明授权公开(公告)号：US11361792B2
公开(公告)日：2022-06-14
申请号：US16361589
申请日：2019-03-22
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
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 the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.
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92.发明申请公开(公告)号：US20210358521A1
公开(公告)日：2021-11-18
申请号：US17386616
申请日：2021-07-28
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
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 the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40.
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93.发明授权公开(公告)号：US10854231B2
公开(公告)日：2020-12-01
申请号：US16142560
申请日：2018-09-26
申请人： FUJIFILM Corporation
发明人： Norihito Kasada , Eiki Ozawa
摘要： Provided are a magnetic recording medium, in which a magnetic layer includes ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110)/Int(114) 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 squareness ratio of the magnetic recording medium is 0.65 to 1.00, a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
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公开(公告)号：US10854229B2
公开(公告)日：2020-12-01
申请号：US16038847
申请日：2018-07-18
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Toshio Tada , Norihito Kasada , Takuto Kurokawa
摘要： Provided is a magnetic tape in which an Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, Int(110)/Int(114) of a hexagonal ferrite crystal structure obtained by an XRD analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, 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 greater than 0 nm and equal to or smaller than 10.0 nm, and a difference between the spacings measured by optical interferometry regarding the surface of the back coating layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.
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公开(公告)号：US10854228B2
公开(公告)日：2020-12-01
申请号：US16038771
申请日：2018-07-18
申请人： FUJIFILM Corporation
发明人： Takuto Kurokawa , Norihito Kasada , Toshio Tada , Eiki Ozawa
摘要： The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, a center line average surface roughness measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, 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, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the back coating layer is 15.0° to 30.0°.
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公开(公告)号：US20200279580A1
公开(公告)日：2020-09-03
申请号：US16802768
申请日：2020-02-27
申请人： FUJIFILM Corporation
发明人： Naoki SANO , Eiki OZAWA , Norihito KASADA , Takuto KUROKAWA
摘要： The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference (S0.5−S13.5) between a spacing S0.5 measured on a surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 0.5 atm and a spacing S13.5 measured on the surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 13.5 atm is 9.0 nm or more.
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公开(公告)号：US10755735B2
公开(公告)日：2020-08-25
申请号：US16456965
申请日：2019-06-28
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC分类号： G11B5/584 , G11B5/596 , G11B5/71 , G11B15/46 , G11B5/012 , G11B5/09 , G11B5/70 , G11B5/588 , G11B5/54
摘要： A magnetic tape apparatus, in which a tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element.
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公开(公告)号：US10522180B2
公开(公告)日：2019-12-31
申请号：US15380336
申请日：2016-12-15
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
摘要： The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer; wherein the combined thickness of the nonmagnetic layer and the magnetic layer is less than or equal to 0.60 μm, the coefficient of friction as measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35, at least the magnetic layer contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide, and a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface of the magnetic layer is greater than or equal to 45 atom %.
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公开(公告)号：US10482913B2
公开(公告)日：2019-11-19
申请号：US15900345
申请日：2018-02-20
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
摘要： A 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. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 μm. The magnetic layer includes an abrasive, and the percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm×6.3 μm of the surface of the magnetic layer with respect to the total area of the region, obtained by plane observation performed by using a scanning electron microscope, is greater than or equal to 0.02% and less than 0.06%. Also, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.
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公开(公告)号：US10373632B2
公开(公告)日：2019-08-06
申请号：US15865201
申请日：2018-01-08
发明人： John L. Brand , James D. Kiely
摘要： Provided herein is a magnetic write head including a near field transducer and a magnetic recording media including a media lubricant. The media lubricant includes a first portion and a second portion. The second portion of the media lubricant is evaporated in response to heat emitted from the near field transducer. The second portion of the media lubricant that is evaporated removes a contaminant over the near field transducer.
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