Patents by Inventor Chu-Kwo Liang

Chu-Kwo Liang 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 system for measuring object features
    Patent number: 5859924
    Abstract: A system is provided that simultaneously gathers three-dimensional and two-dimensional data for use in inspecting objects such as chip carriers for defects. Specifically, a source laser beam is directed to an object and forms a spot at the point of impingement at a known X-Y position on the object. The laser beam is reflected at the spot and light reflected off-axially with respect to the source laser beam is detected by two position sensing detectors (PSDs). Simultaneous to detecting off-axially reflected light, retro-reflected light (i.e., the light reflected approximately co-axial with the source laser) is detected by a photo diode array.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: January 12, 1999
    Assignee: Robotic Vision Systems, Inc.
    Inventors: Kuo-Ching Liu, Chu-Kwo Liang, Jong-Kae Fwu, Chung-Po Huang