Inspection of coating printed circuit

Vision system for the inspection and quality control of the varnish cover in PCBs.

This equipment checks that the varnish doesn’t cover the relay holes, and the correct coverage of the printer circuit.

Projects: PL2, PL6

Printed circuits are protected with a transparent varnish in order to avoid dust and other polluters being deposited on their surface and produce short circuits. In this project, we used Computer Vision techniques to verify that that varnish is correctly laid, covering the whole plaque fully, and that no varnish clusters are present. Fluorescence images are used to look for black areas in which the varnish is not present (upper bound of the relay box, in the image above).