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公开(公告)号：US20180182420A1
公开(公告)日：2018-06-28
申请号：US15854520
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/588 , G11B5/39 , G11B5/3903 , G11B5/3906 , G11B5/3909 , G11B5/78
Abstract: Provided are an evaluation method of a magnetic tape, in which the magnetic tape which is an evaluation target includes a magnetic layer including a servo pattern, the method including: reading the servo pattern by a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element; measuring electric resistance of the tunnel magnetoresistance effect type element after the reading; and determining quality of the magnetic tape by using a degree of a decrease in the measured electric resistance from a reference value as an index, and a manufacturing method of a magnetic tape including: evaluating the magnetic tape including a servo pattern in a magnetic layer by the evaluation method.
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公开(公告)号：US20170372743A1
公开(公告)日：2017-12-28
申请号：US15626720
申请日：2017-06-19
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
Abstract: The magnetic tape includes a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, 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 a timing-based servo pattern, one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, 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 equal to or greater than 45 atom %.
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公开(公告)号：US20170221516A1
公开(公告)日：2017-08-03
申请号：US15422821
申请日：2017-02-02
Applicant: FUJIFILM Corporation
Inventor： Masahito OYANAGI , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/735 , G11B5/00813 , G11B5/70 , G11B5/7305 , G11B5/733 , G11B5/78 , G11B5/8404 , G11B5/8412
Abstract: The magnetic tape has a magnetic layer and a backcoat layer, wherein 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, 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, 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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公开(公告)号：US20170092315A1
公开(公告)日：2017-03-30
申请号：US15280195
申请日：2016-09-29
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA , Masahito OYANAGI , Toshio TADA
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein 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, and 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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55.发明公开公开(公告)号：US20230402060A1
公开(公告)日：2023-12-14
申请号：US18455273
申请日：2023-08-24
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Takashi Fujimoto
IPC: G11B5/66
CPC classification number: G11B5/676
Abstract: Provided are a magnetic recording medium including a non-magnetic support, and a magnetic layer including a ferromagnetic powder. The ferromagnetic powder is an ε-iron oxide powder, and an intensity ratio (Int1/Int2) of diffraction intensities obtained by an X-ray diffraction analysis of the magnetic layer using an In-Plane method after the magnetic layer is pressed at a pressure of 70 atm is 1.0 or more and 6.5 or less, a magnetic tape cartridge and a magnetic recording and reproducing device each including the magnetic recording medium.
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Patent Agency Ranking
56.发明公开公开(公告)号：US20230290376A1
公开(公告)日：2023-09-14
申请号：US18182723
申请日：2023-03-13
Applicant: FUJIFILM Corporation
Inventor： Takashi FUJIMOTO , Eiki OZAWA
CPC classification number: G11B5/70642 , G11B5/712 , G11B5/702
Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A magnetic tape cartridge and a magnetic recording and reproducing device include the magnetic recording medium. The ferromagnetic powder is an ε-iron oxide powder, and a ferromagnetic powder filling rate of a magnetic layer surface obtained by observing a surface of the magnetic layer with a scanning electron microscope is 0.40 or more and 0.60 or less.
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公开(公告)号：US20230096425A1
公开(公告)日：2023-03-30
申请号：US18052464
申请日：2022-11-03
Applicant: FUJIFILM Corporation
Inventor： Naohiro OHARA , Eiki OZAWA
IPC: H04R17/00 , H10N30/50 , H10N30/00 , H10N30/87 , H10N30/076
Abstract: An object of the present invention is to provide a piezoelectric element capable of improving the sound pressure particularly in a high frequency band by decreasing the impedance in a case of being used as an electroacoustic transducer or the like, and a piezoelectric speaker formed of a piezoelectric film. The object can be achieved by using a piezoelectric film in which a piezoelectric layer containing piezoelectric particles in a polymer matrix is sandwiched between electrode layers, a planar shape is a polygon, the piezoelectric film has a protruding portion protruding from a side of a polygon other that a shortest side, and the protruding portion is provided with connecting portions for connecting an external power supply and an electrode layer or identical connecting portions are provided in the vicinity of end portions on a side other than the shortest side.
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公开(公告)号：US20210366509A1
公开(公告)日：2021-11-25
申请号：US17393415
申请日：2021-08-04
Applicant: FUJIFILM CORPORATION
Inventor： Eiki OZAWA , Michitaka KONDO , Kentaro MIYAMOTO , Naoki SANO
Abstract: An information processing device includes a recording unit that records a plurality of objects including data and metadata related to the data on a magnetic recording medium, and executes, after recording at least one of the objects, processing of recording first set data which is a set of the metadata included in the object. The first set data is the set of the metadata included in the object recorded after recording the first set data that is recorded immediately before. The magnetic recording medium has a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support. A difference between spacings S0.5 and S13.5 measured under pressures of 0.5 atm and 13.5 atm by an optical interference method after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 3.0 nm.
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公开(公告)号：US20200251141A1
公开(公告)日：2020-08-06
申请号：US16777393
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA
Abstract: The magnetic tape in which the followings are satisfied, after the magnetic layer is pressed at a pressure of 70 atm. A full width at half maximum of a spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 15.0 nm; a full width at half maximum of a spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 15.0 nm; and a difference (Safter−Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Sbefore measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm.
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公开(公告)号：US20200251139A1
公开(公告)日：2020-08-06
申请号：US16777201
申请日：2020-01-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Atsushi MUSHA
Abstract: The magnetic tape include a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference (L99.9−L0.1) between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an isoelectric point of a surface zeta potential of the magnetic layer is 5.5 or more.
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