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公开(公告)号：US20200005827A1
公开(公告)日：2020-01-02
申请号：US16456780
申请日：2019-06-28
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Atsushi Musha
Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35, the 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, 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：US10522180B2
公开(公告)日：2019-12-31
申请号：US15380336
申请日：2016-12-15
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: 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：US10522179B2
公开(公告)日：2019-12-31
申请号：US15690906
申请日：2017-08-30
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: A magnetic tape is provided 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 ferromagnetic hexagonal ferrite powder and an abrasive. 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 by plane observation using a scanning electron microscope, with respect to the total area of the region, is equal to or greater than 0.02% and less than 0.06%. Further, 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 by using a scanning transmission electron microscope is 0.85 to 1.00.
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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
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: 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：US10438622B2
公开(公告)日：2019-10-08
申请号：US16044574
申请日：2018-07-25
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa
Abstract: The magnetic tape device includes a magnetic tape; and a servo head, in which the servo head is a TMR head, the magnetic tape includes a servo pattern in the magnetic layer, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 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, and a 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 thereof in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
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Patent Agency Ranking
公开(公告)号：US10438621B2
公开(公告)日：2019-10-08
申请号：US15900334
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: A magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support. The thickness of the back coating layer is less than or equal to 0.30 μm. 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. Further, the contact angle with respect to 1-bromonaphthalene measured regarding the surface of the back coating layer is 15.0° to 30.0°.
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公开(公告)号：US10431251B2
公开(公告)日：2019-10-01
申请号：US15920533
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: The magnetic tape device includes a TMR head (reproducing head); and a magnetic tape including a magnetic layer including ferromagnetic powder, a binding agent, and fatty acid ester, in which Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic 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 7.0 nm, a difference between spacings before and after the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm, and ΔSFD (=SFD25° C.−SFD−190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50.
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公开(公告)号：US20190295586A1
公开(公告)日：2019-09-26
申请号：US16361570
申请日：2019-03-22
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a magnetic tape total thickness is equal to or smaller than 5.30 μm, the magnetic layer has a servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.
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公开(公告)号：US10403312B2
公开(公告)日：2019-09-03
申请号：US15920592
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: The magnetic tape device includes a TMR head and a magnetic tape, in which the magnetic tape includes fatty acid ester in a magnetic layer, Ra measured regarding a surface of the magnetic layer is 2.0 nm or smaller, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and 7.0 nm or smaller, a difference between spacings before and after the vacuum heating is greater than 0 nm and 8.0 nm or smaller, and a ratio 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 thereof 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：US10373639B2
公开(公告)日：2019-08-06
申请号：US15920768
申请日：2018-03-14
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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