Automated Calibration of Card Inspection Tool
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Automated calibration is described for a video inspection tool that automatically inspects printed circuit cards to verify correct component lead insertion prior to soldering the card. The tool uses fast, low computation analysis routines for lead verification. These fast routines allow a slow, inexpensive, general-purpose computer to perform the analysis at production speeds. The analysis routines verify lead presence by applying a set of predetermined parameters to the image data. The values of these parameters are dependent upon factors such as clinch angle, lead shape and reflectance, and lighting intensity. The values chosen for these parameters are critical to the inspection results because if they are too "conservative", then many leads will be falsely reported as being defective.