Patents by Inventor Jull Lee

Jull Lee 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 device for measuring the tilt of an optical disc
    Publication number: 20060250914
    Abstract: A method and device for measuring the tilt in an optical disc drive (1) is disclosed. The optical disc drive (1) comprises two lasers (31, 41) generating two laser beams (32, 42) having mutually different optical characteristics. One of these laser beams (32) is continuously ON, and is used for writing or reading data to or form the disc. The other laser beam (42) is repeatedly switched ON and OFF. Tilt is measured by comparing a normalized error signal (RED(ON)) during the ON-phase (TON) with a normalized error signal (RED(OFF)) during the OFF-phase.
    Type: Application
    Filed: March 10, 2004
    Publication date: November 9, 2006
    Inventors: Sjoerd Stallinga, Ole Andersen, Jull Lee