System design for PCB defects detection based on AOI technology

A design of PCB automatic defects detection system based on AOI technology is presented. The hardware design is emphatically introduced including illumination module, image acquisition module, motion control unit, PC, graphic display device and operation unit. Simultaneously, the software design is briefly explained. This design is a non-contact PCB defects detection technology which can not only detect open circuit and short circuit defects, but also can detect wire gaps, voids, scratch defects etc. The highest resolution of the design is 15μm and the detection success rate is over 95%.