Patents by Inventor Fuminobu Maruyama

Fuminobu Maruyama 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 apparatus for a magnetic disk having projections provided thereon
    Patent number: 5796539
    Abstract: In a magnetic disk apparatus including a magnetic head and a magnetic disk medium having projections provided with a constant regularity, a rotating portion for driving the rotation of the magnetic disk medium is controlled by a control section in accordance with the regularity of the projections provided on the magnetic disk medium, a resonance frequency of the magnetic head and a relative speed of the magnetic disk medium to the magnetic head in order to prevent the resonance of the magnetic head from being caused by the projections of the magnetic disk medium. With such a construction, it is possible to realize the stabilization of floatation of the magnetic head in the magnetic disk apparatus, thereby providing a magnetic disk apparatus which has a low floating height and a high reliability.
    Type: Grant
    Filed: July 10, 1996
    Date of Patent: August 18, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Noriyoshi Goda, Fuminobu Maruyama, Masayuki Suzuki