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121.发明授权公开(公告)号：US10854233B2
公开(公告)日：2020-12-01
申请号：US16144605
申请日：2018-09-27
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: Provided are a magnetic recording medium, in which a magnetic layer includes a ferromagnetic hexagonal ferrite powder, a binding agent, 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 is 0.65 to 1.00, one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide is contained in a magnetic layer side portion on the non-magnetic support, a C—H derived C concentration of the magnetic layer is 45 atom % to 65 atom %, 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：US10854230B2
公开(公告)日：2020-12-01
申请号：US16038884
申请日：2018-07-18
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Toshio Tada , Eiki Ozawa , Takuto Kurokawa
Abstract: 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, an Ra 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 logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the back coating layer is equal to or smaller than 0.060.
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123.发明授权公开(公告)号：US10573338B2
公开(公告)日：2020-02-25
申请号：US15900141
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa
IPC: G11B5/78 , G11B5/008 , G11B5/706 , G11B5/02 , G11B5/708 , G11B5/845 , G11B5/70 , G11B5/73 , G11B5/596 , G11B5/39
Abstract: A magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a Tunneling Magnetoresistive (TMR) head, the center line average surface roughness Ra measured regarding the surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and the ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
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公开(公告)号：US10540996B2
公开(公告)日：2020-01-21
申请号：US15280195
申请日：2016-09-29
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Masahito Oyanagi , Toshio Tada
Abstract: A magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support. The magnetic layer contains a fatty acid ester. The full width at half maximum of the spacing distribution as measured by optical interferometry on the magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm. The full width at half maximum of the spacing distribution after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm. The difference between the spacing Safter after vacuum heating the magnetic tape and the spacing Sbefore before vacuum heating the magnetic tape, Safter−Sbefore, is greater than 0 nm but less than or equal to 8.0 nm.
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公开(公告)号：US10529368B2
公开(公告)日：2020-01-07
申请号：US15690400
申请日：2017-08-30
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: A magnetic tape includes: a non-magnetic support; a magnetic layer on one surface side of the non-magnetic support; and a back coating layer on the other surface side. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.0 nm to 1.8 nm. The magnetic layer includes ferromagnetic hexagonal ferrite powder and non-magnetic powder. The tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00. Further, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is less than or equal to 0.060.
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Patent Agency Ranking
公开(公告)号：US20200005814A1
公开(公告)日：2020-01-02
申请号：US16456831
申请日：2019-06-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Atsushi Musha
Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which 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 of the magnetic tape at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and the 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.
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公开(公告)号：US10515661B2
公开(公告)日：2019-12-24
申请号：US16182083
申请日：2018-11-06
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa
Abstract: The magnetic tape device includes a magnetic tape including a magnetic layer, in which 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 direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and 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 45 to 65 atom %.
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公开(公告)号：US10510370B2
公开(公告)日：2019-12-17
申请号：US15626832
申请日：2017-06-19
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Tetsuya Kaneko , Norihito Kasada
Abstract: A magnetic tape is provided in which the total thickness of a non-magnetic layer and a magnetic layer is equal to or smaller than 0.60 μm. The magnetic layer includes a timing-based servo pattern and also includes fatty acid ester. The 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 less than or equal to 7.0 nm, while the same value measured after performing the vacuum heating is also greater than 0 nm and less than or equal to 7.0 nm. Further, the 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.
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公开(公告)号：US10510366B2
公开(公告)日：2019-12-17
申请号：US16232165
申请日：2018-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
IPC: G11B5/09 , G11B5/39 , G11B5/66 , G11B5/596 , G11B5/592 , G11B5/55 , G11B5/008 , G11B5/584 , G11B5/70
Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, 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 magnetic layer includes a servo pattern, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.
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公开(公告)号：US10475481B2
公开(公告)日：2019-11-12
申请号：US15422821
申请日：2017-02-02
Applicant: FUJIFILM Corporation
Inventor： Masahito Oyanagi , Norihito Kasada , Eiki Ozawa
Abstract: The magnetic tape has a magnetic layer and a backcoat layer. The Ra on the magnetic layer side surface is less than or equal to 1.8 nm, the coefficient of friction measured on the base portion of the magnetic layer side surface is less than or equal to 0.35, and the Ra measured on the backcoat layer side surface is less than or equal to 5.0 nm. The backcoat layer contains a fatty acid ester. In addition, the FWHMbefore measured on the backcoat layer side surface before vacuum heating is greater than 0 nm but less than or equal to 10.0 nm, the FWHMafter after vacuum heating 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.
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