AOI automatic optical detector is mainly used in SMT enterprises for off-line or on-line inspection of the appearance and process quality of printed circuit board and its components, for the solder paste printing with or without, skew, less tin, more tin, open circuit and pollution; for the parts with defects, such as missing parts, offset, skew, monument, side standing, turning over, reverse polarity, wrong parts and damage; and for the solder joint defects, such as more tin, less tin and continuous Tin and other problems detection, identification and identification identification are of great help. It can not only reduce the problem products for the later process, but also improve the quality advantage for the factory.