LDI (Laser Direct Imaging) is laser direct imaging technology, which is one of the direct exposure technologies.After this kind of technology is applied to the PCB exposure link, compared with the traditional mask (film) exposure, it can save the time required for multiple processes such as plate making and process verification, and greatly improve production efficiency.In addition, since there is no need for a mask (film), the alignment error caused by thermal expansion can be optimized, and the defects caused by mask defects can be avoided, thereby improving the accuracy and output of PCB production.