2711 Study on Accuracy Improvement of Micro Fresnel Glass Molding

Abstract

This report deals with the precision grinding of micro fresnel shape with many micro grooves and precision molding of micro glass fresnel lenses. Fresnel lenses are useful for the next generation type of optical devices because of its thin structure and excellent optical characteristics. In the conventional machining method, the lens materials were restricted to plastics, because the cutting tool was a single crystal diamond and the mold material was restricted to a soft metal such as copper or electroless deposited nickel-phosphorous (Ni-P) alloy. In this study, a new grinding method and a new sharp edge truing method were developed and the molds of glassy carbon for glass lenses were ground in trial and a ultra precision glass lenses were molded.