-
公开(公告)号：US20230335159A1
公开(公告)日：2023-10-19
申请号：US18298730
申请日：2023-04-11
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yuto MURATA , Nagisa YAMASAKI
CPC classification number: G11B5/7356 , G11B5/00856
Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation σ of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
-
42.发明公开公开(公告)号：US20230290379A1
公开(公告)日：2023-09-14
申请号：US18320418
申请日：2023-05-19
Applicant: FUJIFILM CORPORATION
Inventor： Yusuke KANEKO , Toru NAKAO , Atsushi MUSHA , Norihito KASADA
CPC classification number: G11B23/042 , G11B15/43 , G11B15/06
Abstract: A magnetic tape cartridge includes a case in which a magnetic tape is housed, and an NVM of a cartridge memory provided in the case. The NVM stores cartridge information including an identification ID regarding an allowable range of temperature/humidity in using the magnetic tape, an upper limit of a preservation period of the magnetic tape, and an upper limit of a use frequency of the magnetic tape.
-
公开(公告)号：US20230103135A1
公开(公告)日：2023-03-30
申请号：US17955251
申请日：2022-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: A magnetic tape in which a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopy performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 atom % to 65 atom %, and in an environment with a temperature of 32° C. and a relative humidity of 80%, a frictional force F45° on the surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less,
-
公开(公告)号：US20230097367A1
公开(公告)日：2023-03-30
申请号：US17955156
申请日：2022-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: A magnetic tape in which an arithmetic average roughness Ra measured at a surface of the magnetic layer with an atomic force microscope is 2.0 nm or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value45° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
-
公开(公告)号：US20230045648A1
公开(公告)日：2023-02-09
申请号：US17872566
申请日：2022-07-25
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Atsushi MUSHA
Abstract: A magnetic tape device. The angle θ formed by the axis of the element array of the magnetic head with respect to a width direction of the magnetic tape is changed during running of the magnetic tape in the magnetic tape device. The magnetic tape satisfies Equation 1: TDSage+TDSenv−TC≤0.10 μm. In Equation 1, the TDSage is a maximum value of an absolute value of a difference between a servo band spacing obtained before storage for 24 hours in a predetermined environment and a servo band spacing obtained after the storage. TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of servo band spacings obtained in each of five predetermined environments by ½, and TC is a value calculated by TC=L{cos (θinitial−Δθ)−cos (θinitial+Δθ)}.
-
Patent Agency Ranking
公开(公告)号：US20230039477A1
公开(公告)日：2023-02-09
申请号：US17872464
申请日：2022-07-25
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA
Abstract: A magnetic tape device. The angle θ formed by the axis of the element array of the magnetic head with respect to a width direction of the magnetic tape is changed during running of the magnetic tape in the magnetic tape device. In a case where predetermined storage is defined as one cycle, a maximum value of an absolute value of a difference between a servo band spacing obtained before performing the storage and a servo band spacing obtained after the storage of N cycles is defined as A, and N is set to 1, 2, 3, 4, or 5, a medium life calculated by a linear function of A and a logarithm loge T of T, that are derived from a value of A and a value of the logarithm loge T of total storage time T of the storage of N cycles is 5 years or longer.
-
公开(公告)号：US20220415350A1
公开(公告)日：2022-12-29
申请号：US17847800
申请日：2022-06-23
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke KANEKO
Abstract: The magnetic tape cartridge group includes a plurality of magnetic tape cartridges. Regarding 100 reels of magnetic tape cartridges, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before predetermined storage and a servo band spacing obtained after the predetermined storage is defined as A, an arithmetic mean of medium lives calculated by a linear function derived from a value of A obtained for different N and a value of the logarithm of total storage time T of the storage of N cycles is 3 years or longer and 3σ is 1 year or shorter. Medium life: T in a case where A satisfies A=1.5−B. B: a value calculated by multiplying a difference between a maximum value and a minimum value of servo band spacings obtained in each of the five environments by ½.
-
公开(公告)号：US20220366935A1
公开(公告)日：2022-11-17
申请号：US17730687
申请日：2022-04-27
Applicant: FUJIFILM Corporation
Inventor： Norihito KASADA , Yusuke KANEKO
Abstract: In the magnetic tape, a magnetic tape deformation amount after storage for 3 months each in a predetermined environment is 0.50 μm or less, a rate of a change in the magnetic tape deformation amount with respect to a change in relative humidity is 0.0001 μm/% to 0.0500 μm/%, and a rate of a change in magnetic tape deformation amount with respect to a change in temperature is 0.0010 μm/° C. to 0.1000 μm/° C.
-
公开(公告)号：US20220270644A1
公开(公告)日：2022-08-25
申请号：US17673314
申请日：2022-02-16
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , Norihito KASADA , So MATSUYAMA
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A rate of change (AlFeSil abrasion value 2/AlFeSil abrasion value 1) in AlFeSil abrasion value measured on a surface of the magnetic layer before and after storage of the magnetic tape in an environment of a temperature of 23° C. and a relative humidity of 50% is 0.7 or more.
-
公开(公告)号：US20220020393A1
公开(公告)日：2022-01-20
申请号：US17376175
申请日：2021-07-15
Applicant: FUJIFILM Corporation
Inventor： Takuto KUROKAWA , So MATSUYAMA , Norihito KASADA
Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including a ferromagnetic powder, in which in an environment of a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value0.2 N on a magnetic layer surface, which is measured by applying a tension of 0.2 N in a longitudinal direction of the magnetic tape, is in a range of 20 to 50 μm, and an AlFeSil abrasion value1.5 N on the magnetic layer surface measured by applying a tension of 1.5 N in the longitudinal direction of the magnetic tape is in a range of 20 to 50 μm.
-
-
-
-
-
-
-
-
-
Search Results
228
records
(took 0.034 seconds)
