Patents by Inventor Tam D. Doan

Tam D. Doan 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 inspection system for solder joints and inspection method
    Patent number: 5247344
    Abstract: The adequacy of the fillets (24, 26) by which the lead (22) is soldered to pad (18) on printed circuit board (16) is evaluated by providing low angle diffuse illumination from circular fluorescent lamp (34) and observing the image with a television camera (30). The electronic image information is digitized and analyzed to produce a signal corresponding to the adequacy of the fillets and thus the adequacy of the solder joint. Automatic inspection is achieved and the signal can be employed to translate the printed wiring board to a new position for automatic inspection of another solder joint.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: September 21, 1993
    Assignee: Hughes Aircraft Company
    Inventor: Tam D. Doan