Patents by Inventor Yuhji Amari

Yuhji Amari 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).

  • Disk drive with reduced vibration due to rotational acceleration of a spindle motor
    Patent number: 7474490
    Abstract: Embodiments in accordance with the present invention provide a disk drive that ensures quieter rotational acceleration of a recording disk. Certain embodiments relate to a hard disk drive that detects the vibration of an enclosure by monitoring, via a driver, a counter electromotive voltage generated in a voice coil motor. If the hard disk drive detects a predetermined level of vibration or higher in the enclosure, it switches the status of a drive signal applied to a spindle motor so as to reduce the current level or smooth the waveform. This ensures reduced vibration of the enclosure.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: January 6, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Yukiko Hayashi, Isao Yoneda, Gaku Ikedo, Nobuhisa Koide, Yuhji Amari
  • Disk drive
    Publication number: 20070253089
    Abstract: Embodiments in accordance with the present invention provide a disk drive that ensures quieter rotational acceleration of a recording disk. Certain embodiments relate to a hard disk drive that detects the vibration of an enclosure by monitoring, via a driver, a counter electromotive voltage generated in a voice coil motor. If the hard disk drive detects a predetermined level of vibration or higher in the enclosure, it switches the status of a drive signal applied to a spindle motor so as to reduce the current level or smooth the waveform. This ensures reduced vibration of the enclosure.
    Type: Application
    Filed: April 26, 2007
    Publication date: November 1, 2007
    Applicant: Hitachi Global Storage Technologies Inc.
    Inventors: Yukiko Hayashi, Isao Yoneda, Gaku Ikedo, Nobuhisa Koide, Yuhji Amari