광학용 플라스틱(PMMA, PC)의 초정밀 절삭 특성

The aspherical lens are used as objective lens of optical pickup The sample product is made before manufacturing the injection mould of lens to examine the design factor The optimum cutting conditions of the mam spindle speed, the depth of cut, the feed rate are found when we cut PMMA and PC lens sample with ultra-precision SPDT The demanded surface roughness 10 ㎚ Ra, aspherical form error 0 5 ㎛ P-V for aspherical lens of optical data storage device are satisfied for PMMA, but not satisfied for PC