A contact exposure imaging device used in the manufacture of a printing plate (PS plate, screen plate, etc.), which uses pressure to make the original plate close to the photosensitive plate, so that the original image can be accurately printed on the photosensitive plate by photochemical reaction. There are one-sided plate-exposing machine and two-sided overturned plate-exposing machine (also known as doubl-sided rotary exposing machine, referred to as double-back) two types.