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公开(公告)号：US20220028422A1
公开(公告)日：2022-01-27
申请号：US17378783
申请日：2021-07-19
Applicant: FUJIFILM Corporation
Inventor： Yusuke KANEKO , Norihito KASADA
IPC: G11B5/73
Abstract: The magnetic tape cartridge includes a magnetic tape that is accommodated in the magnetic tape cartridge while being wound around a reel hub. A water absorption amount of the magnetic tape measured after the magnetic tape cartridge is stored in a storage environment of a temperature of 32° C. and a relative humidity of 80% for 10 days is more than 0.30 g as a value in terms of a length of the magnetic tape of 1000 m, and the water absorption amount is a value measured in a measurement environment with a temperature of 21° C. and a relative humidity of 50% within 1 hour after the storage.
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公开(公告)号：US20210383830A1
公开(公告)日：2021-12-09
申请号：US17333017
申请日：2021-05-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: A magnetic tape device, in which a magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, the magnetic tape after running in a state where the tension is applied is caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and a cupping amount of the magnetic tape is in a range of ±2.0 mm.
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公开(公告)号：US20210383827A1
公开(公告)日：2021-12-09
申请号：US17338694
申请日：2021-06-04
Applicant: FUJIFILM Corporation
Inventor： So MATSUYAMA , Norihito KASADA , Takuto KUROKAWA
Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.2 μm or greater and less than 0.5 μm. In the magnetic recording medium, the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 μm or greater and less than 0.20 μm, is 100 to 2,000 per area of 40 μm×40 μm.
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94.发明申请公开(公告)号：US20210335387A1
公开(公告)日：2021-10-28
申请号：US17368274
申请日：2021-07-06
Applicant: FUJIFILM Corporation
Inventor： 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 an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, and a 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：US20210241795A1
公开(公告)日：2021-08-05
申请号：US17161031
申请日：2021-01-28
Applicant: FUJIFILM Corporation
Inventor： Yuto MURATA , Yusuke KANEKO , Norihito KASADA
Abstract: In the probability distribution calculated from TDSage, TDSenv, and TC, the magnetic tape has the probability Pfail of equal to or less than 0.2%, in which the absolute value of ΔSB exceeds 0.3 μm. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by ½, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.
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Patent Agency Ranking
公开(公告)号：US20210233566A1
公开(公告)日：2021-07-29
申请号：US17155777
申请日：2021-01-22
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.
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公开(公告)号：US20210233565A1
公开(公告)日：2021-07-29
申请号：US17155695
申请日：2021-01-22
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , So MATSUYAMA , Atsushi MUSHA , Shota KAMIMURA
Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.
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公开(公告)号：US20210201945A1
公开(公告)日：2021-07-01
申请号：US17130857
申请日：2020-12-22
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yuto Murata , Yusuke Kaneko
Abstract: A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16° C. and a relative humidity of 20%, a temperature of 16° C. and a relative humidity of 80%, a temperature of 26° C. and a relative humidity of 80%, a temperature of 32° C. and a relative humidity of 20% and a temperature of 32° C. and a relative humidity of 55% is 1.43 μm/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 μm/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 μm/N/° C. or less.
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公开(公告)号：US20200342906A1
公开(公告)日：2020-10-29
申请号：US16856853
申请日：2020-04-23
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: The magnetic recording medium includes a non-magnetic support, a magnetic layer including a ferromagnetic powder on one surface of the non-magnetic support, and a back coating layer including a non-magnetic powder on the other surface of the non-magnetic support, in which a difference (Safter−Sbefore) between a spacing Safter measured by optical interferometry regarding a surface of the back coating layer after methyl ethyl ketone cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the back coating layer before methyl ethyl ketone cleaning is greater than 0 nm and equal to or smaller than 30.0 nm, and the non-magnetic support is an aromatic polyamide support having a moisture absorption of 2.2% or less.
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100.发明申请公开(公告)号：US20200302962A1
公开(公告)日：2020-09-24
申请号：US16825425
申请日：2020-03-20
Applicant: FUJIFILM Corporation
Inventor： Yoshihiro SAWAYASHIKI , Norihito KASADA
Abstract: The magnetic tape 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 the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and ε-iron oxide powder, and the number of protrusions having a height of 50 nm or more and less than 75 nm on a surface of the back coating layer is 700 pieces/6400 μm2 or less.
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