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유영은(Y.E Yoo),김태훈(T.H. KIM),김성곤(S.G. KIM),서영호(Y.H Seo),제태진(T.J Je),최두선(D.S Choi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Micro pyramid pattern and its array are designed to enhance the brightness and its uniformity of LGP which is one of key parts in LCD. The designed micro pyramid patterns are fabricated on a Si-wafer first through MEMS process and then a Ni-stamper is electro-plated from the Si pattern master. Adopting the fabricated Ni-stamper, LGPs are injection molded at different mold temperatures and the fidelity of the pattern replication is estimated for each molding conditions and pattern locations. The replicated patterns are found to have some defect such as local short shot or micro weld line which are believed to have negative effect on the performance of the LGP.
유영은(Y.-E. Yoo),이관희(K.H. Lee),윤재성(J.S. Yoon),최두선(D.-S. Choi),김선경(S.K. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Hydrophobic plastic plates employing nano surface features are injection molded using thermoplastic materials. A variotherm molding process is devised for filling the nano pores and releasing the molded nano features from the master. The size of the molded nano surface features are about 100㎚ in diameter and 200㎚ in height. The size of the molded plate is about 30㎜ × 30㎜ and the thickness is 1㎜. As molding materials, Polypropylene, PMMA, COC and PC are employed, which are all typical co㎜odity thermoplastic materials. The mold temperature(stamper temperature) is investigated as a major processing parameter for molding high aspect ratio nano surface features. Almost fully molded nano features are fabricated above a certain level of mold temperature depends on the employing material. The contact angles on the injection molded plates are measured to estimate the hydrophobicity and found to have higher contact angle up to 180% compared to the blank plate with no surface features