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公开(公告)号：US20180286442A1
公开(公告)日：2018-10-04
申请号：US15920515
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA
CPC classification number: G11B5/70615 , G11B5/00813 , G11B5/3909 , G11B5/70 , G11B5/78
Abstract: The magnetic tape device includes a TMR head (reproducing head); and a magnetic tape including a magnetic layer including ferromagnetic hexagonal ferrite powder, a binding agent, and fatty acid ester, in which an XRD intensity ratio 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 is 0.65 to 1.00, 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, and a difference between spacings before and after 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：US20180240494A1
公开(公告)日：2018-08-23
申请号：US15900242
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Norihito KASADA
CPC classification number: G11B5/712 , G11B5/00813 , G11B5/70 , G11B5/702 , G11B5/70615 , G11B5/71 , G11B5/735 , G11B5/78
Abstract: The 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, in which a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, a contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°, and a 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：US20180240491A1
公开(公告)日：2018-08-23
申请号：US15900160
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA
CPC classification number: G11B5/712 , G11B5/00813 , G11B5/70 , G11B5/71 , G11B5/78
Abstract: The magnetic tape has an Ra measured regarding a surface of the magnetic layer of equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer of equal to or smaller than 0.050, the magnetic layer includes fatty acid ester, a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before and after performing vacuum heating with respect to the magnetic tape is respectively greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing 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 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：US20180240476A1
公开(公告)日：2018-08-23
申请号：US15900141
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA
IPC: G11B5/008 , G11B5/706 , G11B5/02 , G11B5/708 , G11B5/596 , G11B5/39 , G11B5/70 , G11B5/73 , G11B5/845
CPC classification number: G11B5/00813 , G11B5/02 , G11B5/3903 , G11B5/3909 , G11B5/59683 , G11B5/70 , G11B5/7013 , G11B5/70678 , G11B5/708 , G11B5/7305 , G11B5/78 , G11B5/845
Abstract: The magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a TMR head, a center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape 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 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：US20180182431A1
公开(公告)日：2018-06-28
申请号：US15854506
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
IPC: G11B15/675 , G11B5/39 , G11B5/708
CPC classification number: G11B15/67505 , G11B5/3909 , G11B5/584 , G11B5/70 , G11B5/708 , G11B5/71 , G11B5/725 , G11B5/74 , G11B5/84 , G11B5/8408
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 non-magnetic support, and a magnetic layer including ferromagnetic powder, a binding agent, and fatty acid ester on the non-magnetic support, the magnetic layer includes a servo pattern, 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 equal to or smaller than 7.0 nm, and a difference between a spacing 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 measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 9.0 nm.
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Patent Agency Ranking
公开(公告)号：US20180182430A1
公开(公告)日：2018-06-28
申请号：US15854439
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Tetsuya KANEKO , Norihito KASADA
IPC: G11B15/675 , G11B5/39 , G11B5/708
Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which the reproducing head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder, a binding agent, and fatty acid ester on the non-magnetic support, a full width at half maximum of 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 7.0 nm, a full width at half maximum of spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing 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 measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 9.0 nm.
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公开(公告)号：US20180182428A1
公开(公告)日：2018-06-28
申请号：US15854409
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA , Tetsuya KANEKO
CPC classification number: G11B15/18 , G11B5/3909 , G11B5/70 , G11B5/708 , 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 powder and a binding agent on the non-magnetic support, 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：US20180182417A1
公开(公告)日：2018-06-28
申请号：US15854438
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/3909 , G11B5/00826 , G11B5/5526 , G11B5/584 , G11B5/5926 , G11B5/59633 , G11B5/59688 , G11B5/66 , 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：US20170372739A1
公开(公告)日：2017-12-28
申请号：US15624792
申请日：2017-06-16
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA , Takuto KUROKAWA
CPC classification number: G11B5/78 , G11B5/00817 , G11B5/70 , G11B5/708 , G11B5/71 , G11B5/712 , G11B5/7305
Abstract: Provided is a magnetic tape with the total thickness of a non-magnetic and magnetic layers is equal to or smaller than 0.60 μm, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra by ESCA on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before and after vacuum heating with respect to the magnetic tape are respectively greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing measured after the vacuum heating and a spacing measured before 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：US20170372737A1
公开(公告)日：2017-12-28
申请号：US15619012
申请日：2017-06-09
Applicant: FUJIFILM Corporation
Inventor： Masahito OYANAGI , Norihito KASADA
Abstract: Provided is a magnetic tape in which a center line average surface roughness Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, a back coating 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 regarding a surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %.
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