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 RECORDING MEDIUM
    Publication number: 20220036918
    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: Application
    Filed: October 13, 2021
    Publication date: February 3, 2022
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • MAGNETIC TAPE CARTRIDGE AND MAGNETIC TAPE APPARATUS
    Publication number: 20220028422
    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.
    Type: Application
    Filed: July 19, 2021
    Publication date: January 27, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Yusuke KANEKO, Norihito KASADA
  • MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING AND REPRODUCING APPARATUS, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE CARTRIDGE GROUP
    Publication number: 20220028420
    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: Application
    Filed: September 30, 2021
    Publication date: January 27, 2022
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • MAGNETIC TAPE CARTRIDGE AND MAGNETIC TAPE APPARATUS
    Publication number: 20220028421
    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 0.30 g or less 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.
    Type: Application
    Filed: July 19, 2021
    Publication date: January 27, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Yusuke KANEKO, Norihito KASADA
  • MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    Publication number: 20220020393
    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 ?m, 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 ?m.
    Type: Application
    Filed: July 15, 2021
    Publication date: January 20, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Takuto KUROKAWA, So MATSUYAMA, Norihito KASADA
  • MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    Publication number: 20220020392
    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 32° C. and a relative humidity of 80%, a frictional force F0.2 N on a magnetic layer surface with respect to an LTO8 head, which is measured by applying a tension of 0.2 N in a longitudinal direction of the magnetic tape, is in a range of 4 to 15 gf, and a frictional force F1.5 N on the magnetic layer surface with respect to the LTO8 head, which is measured by applying a tension of 1.5 N in the longitudinal direction of the magnetic tape, is in a range of 4 to 15 gf.
    Type: Application
    Filed: July 15, 2021
    Publication date: January 20, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Takuto KUROKAWA, So MATSUYAMA, Norihito KASADA
  • MAGNETIC TAPE CARTRIDGE AND MAGNETIC TAPE DEVICE
    Publication number: 20220013146
    Abstract: The magnetic tape cartridge includes a magnetic tape, and a cartridge reel. In the magnetic tape, a minimum winding deviation occurrence load measured after the magnetic tape is rewound around the cartridge reel by applying a tension of 0.40 N in a longitudinal direction of the magnetic tape is 300 N or less.
    Type: Application
    Filed: July 2, 2021
    Publication date: January 13, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yusuke KAGAWA
  • MAGNETIC RECORDING MEDIUM
    Publication number: 20220005503
    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: Application
    Filed: September 16, 2021
    Publication date: January 6, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Akinori SUGISHIMA
  • MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    Publication number: 20220005504
    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: Application
    Filed: September 16, 2021
    Publication date: January 6, 2022
    Applicant: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • MAGNETIC RECORDING AND REPRODUCING DEVICE
    Publication number: 20210398555
    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 0.5 ?m to 0.8 ?m. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 ?m to 0.50 ?m, is 10 to 500 per area of 40 ?m×40 ?m.
    Type: Application
    Filed: June 4, 2021
    Publication date: December 23, 2021
    Applicant: FUJIFILM Corporation
    Inventors: So MATSUYAMA, Norihito KASADA, Takuto KUROKAWA
  • MAGNETIC RECORDING AND REPRODUCING DEVICE
    Publication number: 20210383827
    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 ?m or greater and less than 0.5 ?m. 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 ?m or greater and less than 0.20 ?m, is 100 to 2,000 per area of 40 ?m×40 ?m.
    Type: Application
    Filed: June 4, 2021
    Publication date: December 9, 2021
    Applicant: FUJIFILM Corporation
    Inventors: So MATSUYAMA, Norihito KASADA, Takuto KUROKAWA
  • MAGNETIC TAPE DEVICE, MAGNETIC TAPE, AND MAGNETIC TAPE CARTRIDGE
    Publication number: 20210383830
    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.
    Type: Application
    Filed: May 28, 2021
    Publication date: December 9, 2021
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • MAGNETIC TAPE DEVICE, MAGNETIC TAPE, AND MAGNETIC TAPE CARTRIDGE
    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
  • MAGNETIC TAPE DEVICE, MAGNETIC TAPE, AND MAGNETIC TAPE CARTRIDGE
    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
  • MAGNETIC TAPE DEVICE, MAGNETIC TAPE, AND MAGNETIC TAPE CARTRIDGE
    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
  • MAGNETIC TAPE DEVICE, MAGNETIC TAPE, AND MAGNETIC TAPE CARTRIDGE
    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
  • MAGNETIC TAPE DEVICE, MAGNETIC TAPE, AND MAGNETIC TAPE CARTRIDGE
    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
  • MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
    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
  • Magnetic tape having characterized magnetic layer, magnetic tape cartridge, and magnetic tape device
    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
  • Magnetic recording medium and magnetic recording and reproducing device
    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