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公开(公告)号：US20180286444A1
公开(公告)日：2018-10-04
申请号：US15920782
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/70626 , G11B5/00817 , G11B5/584 , G11B5/70 , G11B5/70615 , G11B5/71
Abstract: Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, 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 %, and ΔSFD (=SFD25° C.−SFD−190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD25° C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD−19° C. being SFD measured at a temperature of −190° C.
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公开(公告)号：US20180182427A1
公开(公告)日：2018-06-28
申请号：US15854403
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Tetsuya KANEKO
CPC classification number: G11B5/708 , G11B5/00817 , G11B5/3909 , G11B5/70 , G11B5/70678 , G11B5/78
Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and a 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 0.95.
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公开(公告)号：US20180182426A1
公开(公告)日：2018-06-28
申请号：US15854397
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
CPC classification number: G11B15/18 , G11B5/00817 , G11B5/3909 , G11B5/70 , G11B5/708 , G11B5/78
Abstract: The a magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing 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, and a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 48.0° to 53.0°.
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公开(公告)号：US20180182425A1
公开(公告)日：2018-06-28
申请号：US15848173
申请日：2017-12-20
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Tetsuya KANEKO
CPC classification number: G11B5/78 , G11B5/00813 , G11B5/3909 , G11B5/70
Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing 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, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
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公开(公告)号：US20170358318A1
公开(公告)日：2017-12-14
申请号：US15614876
申请日：2017-06-06
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO , Eiki OZAWA
CPC classification number: G11B5/71 , G11B5/00813 , G11B5/584 , G11B5/70 , G11B5/78
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, in which the magnetic layer includes a timing-based 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, 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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Patent Agency Ranking
公开(公告)号：US20170278540A1
公开(公告)日：2017-09-28
申请号：US15466143
申请日：2017-03-22
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
CPC classification number: G11B20/1201 , G11B5/00813 , G11B5/584
Abstract: The magnetic tape has a timing base servo pattern on the magnetic layer, wherein the centerline average surface roughness Ra on the surface of the magnetic layer is less than or equal to 1.8 nm, the magnetic layer contains a fatty acid ester, the full width at half maximum of spacing distribution measured by optical interferometry on the surface of the magnetic layer before and after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 7.0 nm, the difference of spacing measured by optical interferometry on the surface of the magnetic layer after and before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 8.0 nm.
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公开(公告)号：US20240179474A1
公开(公告)日：2024-05-30
申请号：US18432479
申请日：2024-02-05
Applicant: FUJIFILM Corporation
Inventor： Yusuke KAGAWA , Eiki OZAWA
IPC: H04R17/00 , H10N30/092 , H10N30/85 , H10N30/88
CPC classification number: H04R17/005 , H10N30/092 , H10N30/852 , H10N30/883
Abstract: Provided is a piezoelectric film including electrode layers on both surfaces of a piezoelectric layer which contains piezoelectric particles in a matrix containing a polymer material, in which it is possible to prevent operational failure due to dielectric breakdown between the electrode layers at an end part. The piezoelectric film includes a piezoelectric layer which contains piezoelectric particles in a matrix containing a polymer material, electrode layers which are provided on both surfaces of the piezoelectric layer, and protective layers which are provided on the electrode layers, in which the piezoelectric film further includes an edge surface sealing layer consisting of a material containing a resin, the edge surface sealing layer covering an edge surface of the piezoelectric film, and an inter-electrode distance on the edge surface of the piezoelectric film is 30 μm or more, and is 103% or more and less than 120% with respect to a thickness of the piezoelectric layer.
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公开(公告)号：US20210287702A1
公开(公告)日：2021-09-16
申请号：US17329275
申请日：2021-05-25
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA , Atsushi MUSHA
Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference 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 in which a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.
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公开(公告)号：US20210090602A1
公开(公告)日：2021-03-25
申请号：US17025092
申请日：2020-09-18
Applicant: FUJIFILM Corporation
Inventor： Naoki SANO , Takuto KUROKAWA , Eiki OZAWA , Norihito KASADA , Megumi NAKANO
Abstract: The magnetic recording medium includes: a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which a difference between a spacing measured on a surface of the back coating layer by optical interferometry under a pressure of 0.5 atm after n-hexane cleaning and a spacing measured on the surface of the back coating layer by optical interferometry under a pressure of 13.5 atm after n-hexane cleaning is 12 nm or more.
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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
Applicant: FUJIFILM Corporation
Inventor： Naoki SANO , Eiki OZAWA , Norihito KASADA , Takuto KUROKAWA
Abstract: 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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