Mainly used for the development and production of small and medium-sized integrated circuits, semiconductor components, optoelectronic devices, surface acoustic wave devices, thin film circuits, and power electronic devices. This machine is a double-sided contact exposure machine, with a specially designed reprinting mechanism that can eliminate substrate wedge errors and ensure good contact between the upper and lower mask plates on the upper and lower sides of the substrate, thereby ensuring the exposure quality of the upper and lower sides of the substrat.