A pickup tool (30) has reflective surfaces (42, 44, 46, 48) attached thereto. The pickup tool (30) picks up an object (38) and moves the object (38) over a light source (51). The reflective surfaces (42, 44, 46, 48) reflect a light beam (61) emitted from the light source (51), generating deflected light...http://www.google.com.hk/patents/US6160906?utm_source=gb-gplus-share專利 US6160906 - Method and apparatus for visually inspecting an object
