A system for inspecting a condition of parts packaged on a printed-circuit board. The inspection system includes a position detecting device to receive scattered light due to illumination of the printed-circuit board with a laser beam and convert the received scattered light into a position signal. This...http://www.google.com/patents/US5200799?utm_source=gb-gplus-sharePatent US5200799 - System for optically inspecting conditions of parts packaged on substrate
