Patents by Inventor Jia-Yu Liu

Jia-Yu Liu 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 controlling a tilt between an optical axis of an optical pick-up head and an optical disc
    Patent number: 7492684
    Abstract: A method and apparatus for controlling the tilt between the optical axis of an optical pick-up head and an optical disc applied in an optical disc drive is provided. A trapezoidal-wave signal in a radio frequency signal is received, wherein the trapezoidal-wave signal includes a rising edge and a falling edge. And a slope sum is calculated and so is an amplitude or a time domain area of the trapezoidal-wave signal. Then, a tangential tilt control parameter is generated according to the slope sum, and a radial tilt control parameter is generated according to the amplitude or the time domain area of the trapezoidal-wave signal. Thus, the optical disc drive is controlled according to the tangential tilt control parameter and the radial tilt control parameter for the optical axis of the optical pick-up head to be perpendicular to the optical disc.
    Type: Grant
    Filed: July 18, 2005
    Date of Patent: February 17, 2009
    Assignee: Lite-On It Corporation
    Inventors: Ling-Chen Chang, Jia-Yu Liu, Han-Min Tan
  • Method and apparatus for controlling a tilt between an optical axis of an optical pick-up head and an optical disc
    Publication number: 20060039259
    Abstract: A method and apparatus for controlling the tilt between the optical axis of an optical pick-up head and an optical disc applied in an optical disc drive is provided. A trapezoidal-wave signal in a radio frequency signal is received, wherein the trapezoidal-wave signal includes a rising edge and a falling edge. And a slope sum is calculated and so is an amplitude or a time domain area of the trapezoidal-wave signal. Then, a tangential tilt control parameter is generated according to the slope sum, and a radial tilt control parameter is generated according to the amplitude or the time domain area of the trapezoidal-wave signal. Thus, the optical disc drive is controlled according to the tangential tilt control parameter and the radial tilt control parameter for the optical axis of the optical pick-up head to be perpendicular to the optical disc.
    Type: Application
    Filed: July 18, 2005
    Publication date: February 23, 2006
    Inventors: Ling-Chen Chang, Jia-Yu Liu, Han-Min Tan