Cost Effective Component Placement Quality Measure through Pre-reflow AOI and SPC Tools - one step to the DPC

Automated Optical Inspection (AOI) is a useful tool for assessing workmanship compliance in production PCB assembly environments. With advanced lighting, optics, and image processing capabilities, the machines greatly enhance inspection repeatability, accuracy and throughput. The in-line automatic optical inspection machines usually are not accurate enough to measure the Cmk of the component placement machines, but the x,y shift and the rotation of the components could be measured with circa 25 mum precision.