Patents by Inventor Munehiro Yonezawa

Munehiro Yonezawa 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).

  • Optical disc device
    Patent number: 8325574
    Abstract: An optical disc device capable of preventing a current larger than prescribed in specifications from flowing by measuring amounts of variation in drive signals of the actuator or the spindle motor, and in view of a correlation between those amounts of variation in the drive signals and the amount of current, changing the servo control system characteristics according to measured amounts of variation, and setting a limit to the level of drive signals.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: December 4, 2012
    Assignees: Hitachi, Ltd., Hitachi-LG Data Storage, Inc.
    Inventors: Takeyoshi Kataoka, Seiji Imagawa, Munehiro Yonezawa
  • OPTICAL DISC DEVICE
    Publication number: 20090207708
    Abstract: An optical disc device capable of preventing a current larger than prescribed in specifications from flowing by measuring amounts of variation in drive signals of the actuator or the spindle motor, and in view of a correlation between those amounts of variation in the drive signals and the amount of current, changing the servo control system characteristics according to measured amounts of variation, and setting a limit to the level of drive signals.
    Type: Application
    Filed: December 17, 2008
    Publication date: August 20, 2009
    Inventors: Takeyoshi KATAOKA, Seiji Imagawa, Munehiro Yonezawa