Patents by Inventor Hirohisa Nakasato

Hirohisa Nakasato 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).

  • Spindle motor rotational unbalance correction mechanism
    Patent number: 6109101
    Abstract: A spindle motor rotational unbalance correction mechanism has a stand onto which the magnetic disk apparatus is placed, a mounting device for fixing the magnetic disk apparatus to the stand, and a base plate onto which the stand is placed, with an intervening resilient material therebetween. An acceleration sensor detects the vibration of the magnetic disk apparatus when it is operated. A vibrator applies a mechanical shock to the magnetic disk apparatus. A control circuit calculates from a detection signal from the acceleration sensor any shift in position of the magnetic recording medium mounted on the magnetic disk apparatus and controls the supply of electrical driving power to the vibrator in order to correct for the position shift of the magnetic recording medium, thereby providing a high-performance magnetic disk apparatus in which the position shift of the magnetic disk is corrected.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: August 29, 2000
    Assignee: NEC Corporation
    Inventors: Masanori Iwabuchi, Takeshi Sukegawa, Hirohisa Nakasato