Patents by Inventor Hung P. Dang

Hung P. Dang 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).

  • Optical disc recorder laser power control
    Patent number: 7636377
    Abstract: The present invention is directed to an optical disc recorder laser power control apparatus utilizing two different current sources to solve the problem caused by the contradiction between control resolution and control range. The first current source and the second current source are connected in parallel to a single control output pin. The first current source and the second current source may work independently from each other. The laser driver controls emission power of one of the laser diodes with a driving current supplied from the single control output pin coupled to both the first current source and the second current source. Advantageously, the fine laser power control pitch from the first current source contributes to fine control resolution, while the coarse laser power control from the second current source provides a wide control range for various kinds of laser diodes.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: December 22, 2009
    Assignee: LSI Corporation
    Inventors: Yuanping Zhao, Hung P. Dang