Patent ID: 7149342

Claim:
A method of examining a circuit board in a predetermined area of the circuit board using an apparatus that has a stationary camera and a display unit, the method comprising the following steps: a) positioning a circuit board to be examined in a scanning zone of the camera, wherein a camera image and a circuit board image separate from the camera image are shown on the display unit on the same scale, wherein the circuit board image is generated by a computer aided design (CAD) system; b) moving of the circuit board to be examined to improve congruence between the camera image and the circuit board image; c) enlarging the camera image and the circuit board image on the display unit in the same ratio; d) bringing the camera image to coincide more closely with the circuit board image, and e) displaying the predetermined area so that an enlarged view of the predetermined area of the circuit board to be examined is visible on the display unit.