Patents by Inventor So MATSUYAMA

So MATSUYAMA 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: 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
  • Publication number: 20220270644
    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.
    Type: Application
    Filed: February 16, 2022
    Publication date: August 25, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Takuto KUROKAWA, Norihito KASADA, So MATSUYAMA
  • Publication number: 20220254373
    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A rate of change in friction coefficient on an LTO8 head measured on a surface of the magnetic layer before and after storage of the magnetic tape is 0.7 or more.
    Type: Application
    Filed: February 8, 2022
    Publication date: August 11, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, So Matsuyama, Norihito Kasada
  • Patent number: 11348604
    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: Grant
    Filed: June 4, 2021
    Date of Patent: May 31, 2022
    Assignee: FUJIFILM Corporation
    Inventors: So Matsuyama, Norihito Kasada, Takuto Kurokawa
  • Patent number: 11276429
    Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the magnetic layer includes a compound having a salt structure, and the salt structure is an ammonium salt structure of an alkyl ester anion represented by the following Formula 1. In Formula 1, R represents an alkyl group having 7 or more carbon atoms or a fluorinated alkyl group having 7 or more carbon atoms, Z+ represents an ammonium cation, and a water contact angle on a surface of the magnetic layer is 80° or more and less than 100°. A magnetic recording and reproducing apparatus includes the magnetic recording medium.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: March 15, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Wataru Kikuchi, So Matsuyama
  • Patent number: 11264054
    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: January 22, 2021
    Date of Patent: March 1, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, So Matsuyama, Atsushi Musha, Shota Kamimura
  • 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
  • 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
  • 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
  • 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
  • Publication number: 20210233565
    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: January 22, 2021
    Publication date: July 29, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, So MATSUYAMA, Atsushi MUSHA, Shota KAMIMURA
  • Publication number: 20210233563
    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: Application
    Filed: January 22, 2021
    Publication date: July 29, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Atsushi MUSHA, So MATSUYAMA, Norihito KASADA
  • Publication number: 20200312362
    Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the magnetic layer includes a compound having a salt structure, and the salt structure is an ammonium salt structure of an alkyl ester anion represented by the following Formula 1. In Formula 1, R represents an alkyl group having 7 or more carbon atoms or a fluorinated alkyl group having 7 or more carbon atoms, Z+ represents an ammonium cation, and a water contact angle on a surface of the magnetic layer is 80° or more and less than 100°. A magnetic recording and reproducing apparatus includes the magnetic recording medium.
    Type: Application
    Filed: March 26, 2020
    Publication date: October 1, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Wataru KIKUCHI, So MATSUYAMA