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公开(公告)号：US20180182429A1
公开(公告)日：2018-06-28
申请号：US15854383
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Tetsuya KANEKO
CPC classification number: G11B15/46 , G11B5/3909 , G11B5/70 , G11B5/706 , G11B5/73 , G11B5/78 , G11B5/842
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 powder and a binding agent on the non-magnetic support, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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：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：US20180061447A1
公开(公告)日：2018-03-01
申请号：US15690400
申请日：2017-08-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
IPC: G11B5/78
Abstract: Provided is a magnetic tape including: 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, in which a 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, 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 1.00, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is equal to or smaller than 0.060.
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公开(公告)号：US20180061446A1
公开(公告)日：2018-03-01
申请号：US15690906
申请日：2017-08-30
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: Provided is a magnetic tape 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, a 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%, and a tilt cos 0 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：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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Patent Agency Ranking
公开(公告)号：US20170249965A1
公开(公告)日：2017-08-31
申请号：US15443094
申请日：2017-02-27
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Norihito KASADA , Masahito OYANAGI
CPC classification number: G11B5/735 , G11B5/70 , G11B5/7305 , G11B5/733 , G11B5/78
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, and the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°.
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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：US20170186460A1
公开(公告)日：2017-06-29
申请号：US15388864
申请日：2016-12-22
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Tetsuya KANEKO
CPC classification number: G11B5/78 , G11B5/584 , G11B5/5928 , G11B5/70
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the coercive force measured in the longitudinal direction of the magnetic tape is less than or equal to 167 kA/m, a timing-based servo pattern is present on the magnetic layer, and the edge shape specified by observing the timing-based servo pattern with a magnetic force microscope is a shape in which the difference between the value of the 99.9% cumulative distribution function of the width of misalignment from the ideal shape in the longitudinal direction of the magnetic tape and the value L0.1 of the 0.1% cumulative distribution function, L99.9-L0.1, is less than or equal to 180 nm.
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169.发明申请公开(公告)号：US20170178677A1
公开(公告)日：2017-06-22
申请号：US15380309
申请日：2016-12-15
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
CPC classification number: G11B5/78 , G11B5/70 , G11B5/7085
Abstract: The magnetic tape includes a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder, abrasive, and binder on the nonmagnetic layer, wherein a thickness of the nonmagnetic layer is less than or equal to 0.50 μm, a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1, ΔSFD=SFD25° C.−SFD−190° C., is greater than or equal to 0.50, wherein, in Equation 1, SFD25° C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD−190° C. denotes a SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of −190° C.
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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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