Patents by Inventor Haruhiko Nirasawa

Haruhiko Nirasawa 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: 8059499
    Abstract: Provided is a drive signal generating apparatus including: an arithmetic section that calculates an approximate expression to approximate variations of multiple detected values each representing one of a position of an optical pickup section and an amount of positional deviation of the optical pickup section with respect to a current target position, the position of the optical pickup section being sequentially detected when the optical pickup section moves stepwise toward multiple target positions set in advance on a drawing surface of a drawing target; and a drive signal generation section that generates a second drive signal synchronized with a first drive signal for causing the optical pickup section to move stepwise, the second drive signal having a signal value corresponding to an approximate value calculated by substituting a value associated with each of the multiple target positions into the approximate expression so as to move an optical component provided in the optical pickup section.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: November 15, 2011
    Assignee: Renesas Electronics Corporation
    Inventor: Haruhiko Nirasawa
  • Publication number: 20090231966
    Abstract: Provided is a drive signal generating apparatus including: an arithmetic section that calculates an approximate expression to approximate variations of multiple detected values each representing one of a position of an optical pickup section and an amount of positional deviation of the optical pickup section with respect to a current target position, the position of the optical pickup section being sequentially detected when the optical pickup section moves stepwise toward multiple target positions set in advance on a drawing surface of a drawing target; and a drive signal generation section that generates a second drive signal synchronized with a first drive signal for causing the optical pickup section to move stepwise, the second drive signal having a signal value corresponding to an approximate value calculated by substituting a value associated with each of the multiple target positions into the approximate expression so as to move an optical component provided in the optical pickup section.
    Type: Application
    Filed: March 6, 2009
    Publication date: September 17, 2009
    Applicant: NEC Electronics Corporation
    Inventor: Haruhiko Nirasawa