Patent Review of Optical Mold External Surface Inspection Methods

Optical mold external surface inspection is a key link in the manufacturing industry, which is vital to ensure the quality of the mold and the final performance of the product. With the rapid development of high and new technology, the modern precision manufacturing industry and surface metrology have also made rapid development, and at the same time, the development of advanced surface measuring instruments, the separation of surface topographic features and the evaluation of the characteristic parameters of the technology to develop a higher level. Advanced measuring instruments are hardware platforms and prerequisites to ensure the precision measurement of surface topography, and surface topography feature separation technology provides effective means and methods for the separation of different micro-geometric contour features; the formation of surface topography is due to the small geometric features in the processing by the combined effect of many random factors. It usually consists of roughness, corrugation and facing accuracy, which affects the performance of the whole equipment and its components. In this paper, we mainly review the patents on the inspection methods of facing accuracy on the external surface of optical molds, covering several innovative technologies and methods, and summarize some valuable conclusions which will provide more reliable and efficient inspection solutions for the manufacturing industry, enhance the level of quality control of optical molds, and promote the development of the manufacturing industry.