Patents by Inventor Griffen Chen

Griffen Chen 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).

  • Focus-balance calibration method
    Patent number: 7352666
    Abstract: Absolute time in pre-groove (ATIP) signals or gain amplification signals corresponding to the ATIP signals for auto gain control (AGC) are used for focus-balance calibration of a blank optical disc. The ATIP signals are obtained in response to the movement of an optical pickup head to different positions. The ATIP signals or gain amplification signals are referred to locate an optimal position of the optical pickup head relative to the blank optical disc, therby accomplishing the focus-balance calibration.
    Type: Grant
    Filed: July 20, 2004
    Date of Patent: April 1, 2008
    Assignee: Tian Holdings, LLC
    Inventor: Griffen Chen
  • Focus-balance calibration method
    Publication number: 20050018559
    Abstract: Absolute time in pre-groove (ATIP) signals or gain amplification signals corresponding to the ATIP signals for auto gain control (AGC) are used for focus-balance calibration of a blank optical disc. The ATIP signals are obtained in response to the movement of an optical pickup head to different positions. The ATIP signals or gain amplification signals are referred to locate an optimal position of the optical pickup head relative to the blank optical disc, therby accomplishing the focus-balance calibration.
    Type: Application
    Filed: July 20, 2004
    Publication date: January 27, 2005
    Inventor: Griffen Chen