Demands of a micro structured glass lenses are increasing in a DVD pick-up and dark field systems for automobiles. The glass lenses are molded with a glass mold press with micro ceramics molds and dies, and then ultra-precision grinding technology of ceramic mold has become a core technology. In this study, authors have successfully developed the simultaneous 2-axiss (Y, Z) controlled grinding by using a diamond wheel having sharp edge, and it was clarified that ultra-precision micro fresnel mold could be ground using the sharp diamond wheel. Furthermore, in order to improve the mold form accuracy, a new truing method using a truer made of molybdenum alloy is proposed and the effects of the molybdenum truer are tested. Finally, the micro diamond wheel was trued by the new truing method, and the aspherical molds made of ceramics such as tungsten carbide and glassy carbon for fresnel glass lens of infrared DOE were ground to evaluate grinding performances. From the experimental results, it is clarified that diamond wheel having sharp edge can be trued on the machine and generated by the molybdenum alloy, and the precision accuracy of 0.1 μmP-V and surface roughness of 3nmRa were obtained in grinding.
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