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사출-프레스 이단 성형을 통한 고정밀 폴리머 렌즈의 제작
나진욱(J. W. Na),최성환(S. H. Choi),김순옥(S. O. Kim),전영로(Y. R. Jeon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
According to a remarkable progress of IT industry, precision polymer lens is widely used in optical parts. Due to poor optical properties of polymer, higher precision of lens is strongly required. Conventional forming methods (injection molding, press forming) have unavoidable problems, such as machining of complex mold structure, preparation of proper preform, pressing of a polymer under high temperature and pressure condition, etc. In this paper, two-step forming process is newly proposed, which is press forming using the preform roughly manufactured by injection molding. Aspherical biconvex lens with a diameter of 3.5㎜ are fabricated by this two-step forming process. Through an optimal press condition and well-prepared preform, defects such as crack, bubble and flash are minimized. Also, the fabricated lens has high dimensional accuracy and excellent optical performance.