Patents by Inventor Jeng-Chang Yeh

Jeng-Chang Yeh 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 picking and placing a surface mounted device with the aid of machine vision
    Patent number: 5157734
    Abstract: A method for accurately placing a surface mounting device (SMD) with a vacuum nozzle analyzes a video image of the SMD to locate the SMD leads and compute corrections. The positions of the lead centers are processed to determine the translation and rotation of the SMD relative to a desired location. The position of the SMD centroid is transformed from an image-referenced coordinate system to a space-referenced coordinate system. The SMD rotation relative to a desired orientation is derived from the slope of a line drawn through colinear SMD leads.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: October 20, 1992
    Assignee: Industrial Technology Research Institute
    Inventors: Inn-Ming Chen, Yeu-Hwa Shyy, Jeng-Chang Yeh, Yunghsueh Chao