Patents by Inventor Yoshikazu Miyajima

Yoshikazu Miyajima 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: 5379283
    Abstract: In a magneto-optical recording/reproducing method, recording of information is effected on a magneto-optical recording disk by irradiating the magneto-optical disk with a laser beam from an optical head while applying a magnetic field modulated according to information from a flying magnetic head. A servo control to the optical head such as focusing servo control, tracking servo control or the like is prohibited during loading the flying magnetic head onto a disk surface. According to the magneto-optical recording/reproducing method, servo control failure due to some disturbances upon loading the flying magnetic head to the disk can be prevented.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: January 3, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshikazu Miyajima
  • Patent number: 4843600
    Abstract: A magneto-optical information recording apparatus comprises an objective for condensing a light beam on a magneto-optical recording medium, a bias magnetic field producing device provided on the opposite side of the objective with respect to the magneto-optical recording medium and applying a magnetic field from outside to the magneto-optical recording medium near the condensed point of the light beam, and a protective outer frame containing the objective therein and having an opening for transmitting the light beam therethrough at a location opposed to the magneto-optical recording medium, at least a portion of the protective outer frame being formed of a ferromagnetic material.
    Type: Grant
    Filed: September 8, 1986
    Date of Patent: June 27, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshikazu Miyajima, Makoto Shiho