-
公开(公告)号：US20180350400A1
公开(公告)日：2018-12-06
申请号：US16100289
申请日：2018-08-10
Applicant: FUJIFILM Corporation
Inventor： Tetsuya KANEKO , Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/78 , G11B5/584 , G11B5/7023 , G11B5/70615 , G11B5/70678 , G11B5/714
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.
-
公开(公告)号：US20180286451A1
公开(公告)日：2018-10-04
申请号：US15920563
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA
CPC classification number: G11B5/714 , G11B5/00813 , G11B5/3909 , G11B5/584 , G11B5/70 , G11B5/70615
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.
-
公开(公告)号：US20180286449A1
公开(公告)日：2018-10-04
申请号：US15920538
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Eiki OZAWA
CPC classification number: G11B5/714 , G11B5/00813 , G11B5/3909 , G11B5/70 , G11B5/70678 , G11B5/82
Abstract: The magnetic tape device includes a magnetic tape and a TMR head, in which 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 ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.
-
公开(公告)号：US20180286447A1
公开(公告)日：2018-10-04
申请号：US15920518
申请日：2018-03-14
Applicant: FUJIFILM Corporation
Inventor： Eiki OZAWA , Norihito KASADA
Abstract: The magnetic tape device includes a magnetic tape and a TMR head (servo head), in which 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 ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.
-
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.
-
Patent Agency Ranking
公开(公告)号：US20180240493A1
公开(公告)日：2018-08-23
申请号：US15900230
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Toshio TADA , Norihito KASADA
CPC classification number: G11B5/712 , G11B5/00813 , G11B5/70 , G11B5/70615
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on 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 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 ΔSFD in a longitudinal direction of the magnetic tape calculated by Expression 1: ΔSFD=SFD25° C.−SFD−190° C. is equal to or greater than 0.35. In Expression 1, the SFD25° C. is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD−190° C. is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of −190° C.
-
公开(公告)号：US20180240490A1
公开(公告)日：2018-08-23
申请号：US15900379
申请日：2018-02-20
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Norihito KASADA
Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on 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 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 contact angle with respect to 1-bromonaphthalene measured regarding the surface of the magnetic layer is 45.0° to 55.0°.
-
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.
-
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°.
-
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.
-
-
-
-
-
-
-
-
-
Search Results
228
records
(took 0.045 seconds)
