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公开(公告)号：US10325623B2
公开(公告)日：2019-06-18
申请号：US15854409
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Eiki Ozawa , Tetsuya Kaneko
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：US10325620B2
公开(公告)日：2019-06-18
申请号：US15854438
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
IPC: G11B5/09 , G11B5/39 , G11B5/66 , G11B5/596 , G11B5/592 , G11B5/55 , G11B5/008 , G11B5/584 , 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：US10311909B2
公开(公告)日：2019-06-04
申请号：US15626720
申请日：2017-06-19
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Tetsuya Kaneko , Eiki Ozawa
Abstract: A magnetic tape includes a non-magnetic layer containing non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer containing 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 less than 0.60 μm. The magnetic layer includes a timing-based servo pattern. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer. The C—H derived C concentration calculated from the 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：US10170144B2
公开(公告)日：2019-01-01
申请号：US15920635
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：US10157636B2
公开(公告)日：2018-12-18
申请号：US15920563
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada
Abstract: The magnetic tape device includes a TMR head (servo head); and a magnetic tape, in which a magnetic layer of the magnetic tape includes fatty acid ester, 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 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, 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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Patent Agency Ranking
公开(公告)号：US10074393B2
公开(公告)日：2018-09-11
申请号：US15615871
申请日：2017-06-07
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
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公开(公告)号：US10062403B1
公开(公告)日：2018-08-28
申请号：US15900412
申请日：2018-02-20
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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公开(公告)号：US09984712B1
公开(公告)日：2018-05-29
申请号：US15854329
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Tetsuya Kaneko , Norihito Kasada
CPC classification number: G11B5/706 , G11B5/3909 , G11B5/84
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 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：US09972351B1
公开(公告)日：2018-05-15
申请号：US15854410
申请日：2017-12-26
Applicant: FUJIFILM Corporation
Inventor： Tetsuya Kaneko , Norihito Kasada , Eiki Ozawa
CPC classification number: G11B5/702 , G11B5/00826 , G11B5/3909 , G11B5/584 , G11B5/68 , G11B5/70 , G11B5/84
Abstract: The magnetic tape device including: a magnetic tape; and a servo head, in which 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 logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050.
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公开(公告)号：US09837116B2
公开(公告)日：2017-12-05
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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