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).

  • Publication number: 20210375319
    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, and 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 an edge weave amount of a tape edge on at least one side of the magnetic tape is 1.5 ?m or less.
    Type: Application
    Filed: May 28, 2021
    Publication date: December 2, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Publication number: 20210375311
    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 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 a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before methyl-ethyl-ketone cleaning is greater than 0 nm and 15.0 nm or less.
    Type: Application
    Filed: August 11, 2021
    Publication date: December 2, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Publication number: 20210375316
    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, and 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 residual elongation of the magnetic tape is 0.05% or less.
    Type: Application
    Filed: May 27, 2021
    Publication date: December 2, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Publication number: 20210375307
    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, and a number distribution A of equivalent circle diameters of a plurality of bright areas 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 a surface of the magnetic layer of the magnetic tape with a scanning electron microscope satisfy predetermined number distributions, respectively.
    Type: Application
    Filed: May 28, 2021
    Publication date: December 2, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Publication number: 20210375318
    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, and 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 curvature of the magnetic tape in the longitudinal direction is 4 mm/m or less.
    Type: Application
    Filed: May 27, 2021
    Publication date: December 2, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Publication number: 20210375315
    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, and 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 an adhesive strength of the magnetic layer of the magnetic tape is 1.0 N or more, and an adhesive strength of the back coating layer is 1.0 N or more.
    Type: Application
    Filed: May 27, 2021
    Publication date: December 2, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Patent number: 11189311
    Abstract: The magnetic tape in which the followings are satisfied, after the magnetic layer is pressed at a pressure of 70 atm. A full width at half maximum of a spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 15.0 nm; a full width at half maximum of a spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 15.0 nm; and a difference (Safter?Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Sbefore measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: November 30, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada
  • Patent number: 11189318
    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.
    Type: Grant
    Filed: April 23, 2020
    Date of Patent: November 30, 2021
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Publication number: 20210358521
    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 includes one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, 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.
    Type: Application
    Filed: July 28, 2021
    Publication date: November 18, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Publication number: 20210335387
    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: Application
    Filed: July 6, 2021
    Publication date: October 28, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Patent number: 11145325
    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: October 12, 2021
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Publication number: 20210295865
    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: Application
    Filed: May 26, 2021
    Publication date: September 23, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki OZAWA, Atsushi MUSHA
  • Patent number: 11127428
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference 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 in which a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: September 21, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Publication number: 20210287709
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder, in which the ferromagnetic powder is ?-iron oxide powder, and a coefficient of variation of particle size of the ?-iron oxide powder in a longitudinal direction of the magnetic layer is more than 5.00% and 15.00% or less.
    Type: Application
    Filed: March 9, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Takashi FUJIMOTO, Norihito KASADA, Eiki OZAWA
  • Publication number: 20210287704
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder, in which the ferromagnetic powder is ?-iron oxide powder, and a coefficient of variation of an anisotropic magnetic field Hk in a longitudinal direction of the magnetic tape is 2.0% or more and 10.0% or less.
    Type: Application
    Filed: March 10, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Takashi Fujimoto
  • Publication number: 20210287708
    Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder in which the ferromagnetic powder is an ?-iron oxide powder, and a vertical squareness ratio of the magnetic recording medium measured after pressing the magnetic layer at a pressure of 70 atm is 0.50 to 0.95.
    Type: Application
    Filed: March 9, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito KASADA, Takashi FUJIMOTO
  • Publication number: 20210287703
    Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which the ferromagnetic powder is an ?-iron oxide powder, and a transition temperature Tc of the magnetic recording medium measured after pressing the magnetic layer at a pressure of 70 atm is 80° C. to 240° C.
    Type: Application
    Filed: March 9, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito Kasada, Takashi Fujimoto
  • Publication number: 20210287713
    Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder in which the ferromagnetic powder is ?-iron oxide powder, and a vertical magnetization amount ?m per unit area of the magnetic recording medium measured after pressing the magnetic layer at a pressure of 70 atm is 8.0 G·?m to 80.0 G·?m.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki Ozawa, Takashi Fujimoto
  • Publication number: 20210287705
    Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder in which the ferromagnetic powder is ?-iron oxide powder, and an anisotropic magnetic field Hk of the magnetic recording medium measured after pressing the magnetic layer at a pressure of 70 atm is 15,000 Oe to 40,000 Oe.
    Type: Application
    Filed: March 8, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki OZAWA, Takashi FUJIMOTO
  • Publication number: 20210287712
    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: Application
    Filed: May 21, 2021
    Publication date: September 16, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Takahiro IWAMOTO, Hidemasa Hosoda, Norihito Kasada, Takuto Kurokawa