Patents Represented by Attorney Jon Hallman MacPherson Kwok Chen & Heid

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  • Tracking and focus servo system with error signal inverse non-linearity calibration
    Patent number: 6965547
    Abstract: A digital servo system of an optical disk drive with a calibrated inverse non-linearity function is disclosed. A look-up table is determined, for example, with a focus error signal gain corresponding with a focus error signal offset so that the response of the focus servo system is substantially linear. Additionally, the look-up table can include tracking error signal gain, tracking error signal offset, or tracking loop gain parameters corresponding with the focus error signal offset.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: November 15, 2005
    Assignee: DPHI Acquisitions, Inc.
    Inventors: Ron J. Kadlec, Christopher J. Turner, Hans B. Wach