IN ELECTRONICS MANUFACTURING, IT IS CRUCIAL TO CHECK COPLANARITY OF PADS AND LEADS. THE COPLANARITY OF PADS IS DETERMINED FROM THE FLATNESS OF BARE BOARD. HOWEVER, IT IS MUCH MORE DIFFICULT TO INSPECT THE COPLANARITY OF LEADS. THE INSPECTION OF THE COPLANARITY OF GULL WING LEADS WOULD ENSURE UNIFORM CONTACT BETWEEN ALL LEADS AND THE PADS. IF NON-COPLANAR LEADS ARE SOLDERED USING HOT BAR OR PULSE SOLDERING TECHNIQUES, THERE CAN BE CONSIDERABLE RESIDUAL STRESS WITHIN THE SOLDER JOINTS. UNDER ADVERSE CONDITIONS, THIS RESULTS IN A HIGH POTENTIAL FOR SOLDER JOINT FAILURE. THIS PAPER OUTLINES AN ALGORITHM FOR INSPECTING COPLANARITY OF LEADS. THE TECHNIQUE USED MATHEMATICAL MORPHOLOGY TO PERFORM IMAGE PROCESSING. THE ALGORITHM IS IMPLEMENTED ON A SUN 3/260 AND A DATACUBE SYSTEM. IT IS GENERIC AND CAN BE TRANSPORTED TO OTHER MACHINE VISION SYSTEMS.
| Number of Pages : | 11 |
| Published : | 06/01/1990 |
