Patents by Inventor Norihito KASADA

Norihito KASADA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11551716
    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 ?N 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.
    Type: Grant
    Filed: July 6, 2021
    Date of Patent: January 10, 2023
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 11545177
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8.
    Type: Grant
    Filed: September 16, 2021
    Date of Patent: January 3, 2023
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Akinori Sugishima
  • Publication number: 20220415356
    Abstract: Regarding 100 reels of magnetic tape cartridges in the magnetic tape cartridge group, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in a predetermined environment and a servo band spacing obtained after storage in the predetermined environment for storage time T is defined as A, an arithmetic mean of a medium lives calculated by a linear function derived from a value of A and a value of the logarithm loge T of T is 4 years or longer and 3? is 1 year or shorter. The medium life is T in a case where A satisfies Equation 1=1.5?B, and the B is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band spacings obtained in each of the five predetermined environments by ½.
    Type: Application
    Filed: June 23, 2022
    Publication date: December 29, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke KANEKO
  • Publication number: 20220415350
    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 3? 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.
    Type: Application
    Filed: June 23, 2022
    Publication date: December 29, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke KANEKO
  • Patent number: 11538494
    Abstract: In the magnetic recording and reproducing device, a distal end width of the first magnetic pole in the recording element is substantially the same as a distal end width of the second magnetic pole; the reproducing element width of the reproducing element is equal to or less than 0.8 ?m; and in the magnetic recording medium, a number distribution A of equivalent circle diameters of a plurality of bright areas 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, and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV satisfy predetermined number distribution, respectively.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: December 27, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Atsushi Musha, So Matsuyama, Norihito Kasada
  • Patent number: 11514943
    Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 ?m, the magnetic layer has a servo pattern, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: November 29, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 11514940
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a difference (S0.5?S13.5) between a spacing S0.5 measured by optical interferometry regarding a surface of the magnetic layer under a pressing force of 0.5 atm after n-hexane cleaning and a spacing S13.5 measured by optical interferometry regarding the surface of the magnetic layer under a pressing force of 13.5 atm after n-hexane cleaning is equal to or smaller than 3.0 nm, and a magnetic recording and reproducing device including this magnetic recording medium.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: November 29, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Naoki Sano, Takuto Kurokawa, Norihito Kasada, Eiki Ozawa
  • Patent number: 11514944
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: November 29, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 11508408
    Abstract: The magnetic tape in which a difference (S0.1?S1.6) between a spacing S0.1 and a spacing S1.6 obtained after n-hexane cleaning on a surface of the magnetic layer is equal to or less than 32 nm. The S0.1 is a value obtained as a spacing under a pressing force of 0.1 atm from a relational expression between a pressure and a spacing obtained by performing a spacing measurement on the surface of the magnetic layer by an optical interference method under a pressing force of each of a plurality of different pressures after the n-hexane cleaning, and S1.6 is a spacing measured on the surface of the magnetic layer by the optical interference method under the pressing force of 1.6 atm after the n-hexane cleaning.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: November 22, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, Naoki Sano, Norihito Kasada
  • Publication number: 20220366935
    Abstract: In the magnetic tape, a magnetic tape deformation amount after storage for 3 months each in a predetermined environment is 0.50 ?m or less, a rate of a change in the magnetic tape deformation amount with respect to a change in relative humidity is 0.0001 ?m/% to 0.0500 ?m/%, and a rate of a change in magnetic tape deformation amount with respect to a change in temperature is 0.0010 ?m/° C. to 0.1000 ?m/° C.
    Type: Application
    Filed: April 27, 2022
    Publication date: November 17, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke KANEKO
  • Patent number: 11501799
    Abstract: Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is greater than 0.08 ?m and 0.14 ?m or smaller, and an absolute value ?N of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: November 15, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Hidemasa Hosoda, Takuto Kurokawa, Norihito Kasada, Takahiro Iwamoto
  • Publication number: 20220358958
    Abstract: In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage, and a servo band spacing obtained after storage of N cycles, in a case where predetermined storage is set to one cycle, is defined as A, a medium life calculated by a linear function that is derived from the value of A and the value of the logarithm logeT of total storage time T of the storage of N cycles is 3 years or longer. The medium life is T in a case where the A satisfies Equation a: A=1.5?B. The B is calculated by multiplying a difference between a maximum value and a minimum value of the servo band spacings obtained in each of the five environments by ½.
    Type: Application
    Filed: April 27, 2022
    Publication date: November 10, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke Kaneko
  • Publication number: 20220358961
    Abstract: In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in an environment of a temperature of 32° C. and relative humidity of 55% and a servo band spacing obtained after storage in the environment for a storage time T is set to A, and T is defined as 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours, a medium life calculated by a linear function of A and a logarithm logeT of T, that are derived from a value of A and a value of the logarithm logeT of T obtained for each T is 3 years or longer. The medium life is T in a case where the A satisfies Equation 1: A=1.5?B.
    Type: Application
    Filed: April 27, 2022
    Publication date: November 10, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke Kaneko
  • Patent number: 11495246
    Abstract: The magnetic tape cartridge includes a magnetic tape that is accommodated in the magnetic tape cartridge while being wound around a reel hub. The magnetic tape has a non-magnetic support and a magnetic layer including ferromagnetic powder, and includes one or more components selected from the group consisting of a fatty acid and a fatty acid amide in a portion on the magnetic layer side on the non-magnetic support, and after the magnetic tape cartridge is stored in an environment of an atmosphere temperature of 60° C. and a relative humidity of 80% for 24 hours, 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 at a photoelectron take-off angle of 10 degrees on a surface of the magnetic layer in an inner region during winding of the magnetic tape is 45 at % or more.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: November 8, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yosuke Sumiya
  • Patent number: 11495257
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: November 8, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Akinori Sugishima
  • Publication number: 20220351748
    Abstract: In the magnetic tape, a maximum value of magnetic tape deformation amounts after storage in each of five environments for 1 year is 0.50 ?m or less, a rate of a change of magnetic tape deformation amount with respect to a change in relative humidity obtained from the five magnetic tape deformation amounts is 0.0001 ?m/% to 0.0500 ?m/%, and a rate of a change of the magnetic tape deformation amount with respect to a change in temperature obtained from the five magnetic tape deformation amounts is 0.0010 ?m/° C. to 0.1000 ?m/° C.
    Type: Application
    Filed: April 27, 2022
    Publication date: November 3, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke Kaneko
  • Patent number: 11488628
    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 an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.
    Type: Grant
    Filed: July 26, 2019
    Date of Patent: November 1, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 11482249
    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 ?m/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 ?m/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 ?m/N/° C. or less.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: October 25, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yuto Murata, Yusuke Kaneko
  • Patent number: 11482250
    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.
    Type: Grant
    Filed: September 30, 2021
    Date of Patent: October 25, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 11475915
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: October 18, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada