Semiconductor refers to a material whose conductivity falls between that of a conductor and an insulator at room temperature. Semiconductors have a wide range of applications in mobile phones, automobiles, military industry, aerospace, etc., such as diodes, which are one of the common semiconductor devices. The semiconductor front-end process is very complex, mainly including circuit design, coating, corrosion, slicing, SMT, packaging, testing, and so on. Semiconductors are mainly used in industries such as LED, MEMS, electroacoustics, and PCBA. The dispensing process includes: chip fixation - red glue, electrical connection fixation - silver paste, fixing MEMS devices - silicone, COB packaging protection - epoxy glue, chip solder ball protection (underfill) - epoxy glue, and so on. The role of glue in packaging is relatively important, and there are various ways of dispensing, including time pressure, screw, plunger, jet, piezoelectric, etc.