Patents by Inventor Hyeung Chull Na

Hyeung Chull Na 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).

  • Method and apparatus for measuring the eccentricity of an optical disk
    Patent number: 6700844
    Abstract: A method and apparatus for measuring the eccentricity of an optical disk. The method for measuring the eccentricity of an optical disk in accordance with the present invention comprises the steps of activating tracking servo while the optical disk is rotating, detecting the center value of tracking error signal and setting the center value as a reference value, and detecting the eccentricity of the optical disk by comparing the center value and the tracking error signal received right after the reference value is set. The method in accordance with the present invention precisely measures the eccentricity of an optical disk and adjusts focus and track servo gains and disk rotation speed based upon the measured disk eccentricity, which provides stable data reproduction performance.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: March 2, 2004
    Assignee: LG Electronics Inc.
    Inventor: Hyeung Chull Na
  • Method and apparatus for measuring the eccentricity of an optical disk
    Publication number: 20010019524
    Abstract: A method and apparatus for measuring the eccentricity of an optical disk. The method for measuring the eccentricity of an optical disk in accordance with the present invention comprises the steps of activating tracking servo while the optical disk is rotating, detecting the center value of tracking error signal and setting the center value as a reference value, and detecting the eccentricity of the optical disk by comparing the center value and the tracking error signal received right after the reference value is set. The method in accordance with the present invention precisely measures the eccentricity of an optical disk and adjusts focus and track servo gains and disk rotation speed based upon the measured disk eccentricity, which provides stable data reproduction performance.
    Type: Application
    Filed: January 12, 2001
    Publication date: September 6, 2001
    Inventor: Hyeung Chull Na