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).

  • MAGNETIC TAPE CARTRIDGE AND MAGNETIC RECORDING AND REPRODUCING DEVICE
    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
  • MAGNETIC TAPE CARTRIDGE AND MAGNETIC RECORDING AND REPRODUCING DEVICE
    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
  • Magnetic tape cartridge and magnetic tape apparatus
    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
  • Magnetic recording medium
    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
  • MAGNETIC TAPE CARTRIDGE AND MAGNETIC RECORDING AND REPRODUCING DEVICE
    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
  • Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    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
  • Magnetic recording medium, magnetic recording and reproducing apparatus, magnetic tape cartridge, and magnetic tape cartridge group
    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
  • Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    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
  • Magnetic recording medium
    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
  • Magnetic tape having characterized magnetic layer, magnetic tape cartridge, and magnetic tape apparatus
    Patent number: 11468911
    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, an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5, the magnetic layer includes an oxide abrasive, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 ?m to 0.08 ?m.
    Type: Grant
    Filed: October 21, 2019
    Date of Patent: October 11, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Takahiro Iwamoto, Norihito Kasada
  • Magnetic tape having characterized magnetic layer and magnetic recording and reproducing device
    Patent number: 11462242
    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 0.04 ?m to 0.08 ?m, 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: May 21, 2021
    Date of Patent: October 4, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Takahiro Iwamoto, Hidemasa Hosoda, Norihito Kasada, Takuto Kurokawa
  • Magnetic tape with particular refractive index characteristics, magnetic tape cartridge, and magnetic tape apparatus
    Patent number: 11443766
    Abstract: Provided are a magnetic tape including: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a total thickness of the magnetic tape is equal to or smaller than 5.30 ?m, the magnetic layer has a servo pattern, a center line average surface roughness Ra measured on a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an absolute value ?N of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 to 0.40, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
    Type: Grant
    Filed: December 26, 2019
    Date of Patent: September 13, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Magnetic recording medium and magnetic recording and reproducing device
    Patent number: 11437065
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which an isoelectric point of a surface zeta potential of the magnetic layer after pressing the magnetic layer at a pressure of 70 atm is equal to or less than 3.8.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: September 6, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada
  • Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    Patent number: 11437063
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference L99.9?L0.1 between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an absolute value ?N of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 or more and 0.40 or less.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: September 6, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa, Atsushi Musha
  • MAGNETIC TAPE CONTAINER
    Publication number: 20220277770
    Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, and the roundness of the trajectory of one rotation drawn by the magnetic tape in a case where the wound magnetic tape is pulled out from the core is 100 ?m or less as the arithmetic mean of the measured values at three points in the width direction of the magnetic tape.
    Type: Application
    Filed: February 25, 2022
    Publication date: September 1, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Shota KAMIMURA, Yuto MURATA, Tomohide UEYAMA, Norihito KASADA
  • MAGNETIC TAPE AND MAGNETIC TAPE CONTAINER
    Publication number: 20220277769
    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount ?w in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(?G/?w)×100 is 10% or less. The ?G is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.
    Type: Application
    Filed: February 25, 2022
    Publication date: September 1, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yuto Murata
  • MAGNETIC TAPE CONTAINER
    Publication number: 20220277772
    Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A maximum value of a deviation of a center position of an average minimum region reference circle of a trajectory of one rotation drawn by the magnetic tape, in a case where the wound magnetic tape is drawn out from the core core is 100 ?m or less for three points of the magnetic tape in a width direction.
    Type: Application
    Filed: February 25, 2022
    Publication date: September 1, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Shota KAMIMURA, Yuto MURATA, Tomohide UEYAMA, Norihito KASADA
  • Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    Patent number: 11430476
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference (L99.9?L0.1) between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less.
    Type: Grant
    Filed: April 28, 2021
    Date of Patent: August 30, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa, Atsushi Musha
  • Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    Patent number: 11430475
    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 the magnetic layer has a servo pattern, and 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, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
    Type: Grant
    Filed: September 25, 2020
    Date of Patent: August 30, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
    Patent number: 11430478
    Abstract: Provided are a magnetic tape including: 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 greater than 5.5, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or greater than 4.5, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.
    Type: Grant
    Filed: December 26, 2019
    Date of Patent: August 30, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada