Patents by Inventor Mitsuru Hamaguchi

Mitsuru Hamaguchi 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 disk degaussing device and degaussing method
    Patent number: 7724490
    Abstract: Embodiments in accordance with the present invention provide a degaussing device and a degaussing method capable of efficiently degaussing a magnetic disk, especially, a magnetic disk of the perpendicular magnetic recording system, without resorting to a magnetic field of a high intensity. Embodiments in accordance with the present invention provide a degaussing method of degaussing a magnetic disk not yet installed in a magnetic disk drive by applying an external magnetic field to the magnetic disk by a degaussing device. In accordance with one embodiment, the method includes disposing the magnetic disk in the degaussing device such that the direction of an external magnetic field is inclined at an angle to the axis of easy magnetization of the magnetic disk.
    Type: Grant
    Filed: April 24, 2007
    Date of Patent: May 25, 2010
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hitoshi Tamura, Hiroki Mori, Mitsuru Hamaguchi, Kunihiko Mine, Takehiko Hamaguchi
  • Magnetic disk degaussing device and degaussing method
    Publication number: 20070247776
    Abstract: Embodiments in accordance with the present invention provide a degaussing device and a degaussing method capable of efficiently degaussing a magnetic disk, especially, a magnetic disk of the perpendicular magnetic recording system, without resorting to a magnetic field of a high intensity. Embodiments in accordance with the present invention provide a degaussing method of degaussing a magnetic disk not yet installed in a magnetic disk drive by applying an external magnetic field to the magnetic disk by a degaussing device. In accordance with one embodiment, the method includes disposing the magnetic disk in the degaussing device such that the direction of an external magnetic field is inclined at an angle to the axis of easy magnetization of the magnetic disk.
    Type: Application
    Filed: April 24, 2007
    Publication date: October 25, 2007
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hitoshi Tamura, Hiroki Mori, Mitsuru Hamaguchi, Kunihiko Mine, Takehiko Hamaguchi