Flexible circuit board (FlexiblePrintedCircuit, FPC), also known as soft circuit board and deflection circuit board, is very popular with excellent characteristics such as light quality, thin thickness, and free bending folding ... It mainly relies on artificial visual inspection, with high cost and low efficiency. With the rapid development of the electronics industry, the design of circuit board design has become more and more high -precision and high density. Traditional artificial testing methods can no longer meet production needs. FPC defect automation testing has become an inevitable trend of industrial development.

　　Flexible circuit (FPC) is a technology developed by the United States to develop aerospace rocket technology in the 1970s. It is a high reliability, excellent deflection made by polycatis film or polytamine as a substrate material. The printing circuit is embedded in the circuit design on the bending light and thin plastic sheet to make a large amount of precision components in a narrow and limited space, thereby forming a bending deflection circuit. This kind of circuit can be bent at will, light and light weight, small volume, good heat dissipation, easy installation, breaking through traditional interconnect technology. In the structure of the flexible circuit, the material formed is an insulating film, conductor and adhesive