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50μm급 마이크로렌즈 적용 2인치 휴대폰 LCD-BLU 금형 개발 : 광학패턴의 세장비 영향
김종선,고영배,민인기,유재원,허영무,윤경환,황철진,Kim, J.S.,Ko, Y.B.,Min, I.K.,Yu, J.W.,Heo, Y.M.,Yoon, K.H.,Hwang, C.J. 한국소성가공학회 2007 소성가공 : 한국소성가공학회지 Vol.16 No.1
LCD-BLU(Liquid Crystal Display - Back Light Unit) consists of several optical sheets: LGP(Light Guiding Plate), light source and mold frame. The LGP of LCD-BLU is usually manufactured by etching process and forming numerous dots with $50{\mu}m$ in diameter on the surface. But the surface roughness of LGP with etched dots is very high, so there is much loss of light. In order to overcome the limit of current etched dot patterned LGP, optical pattern design with microlens of $50{\mu}m$ diameter was applied in the present study. The microlens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP and optical simulation was carried out to know tendency of microlens patterned LGP simultaneously. The attention was paid to the effects of different aspect ratio(i.e. $0.2\sim0.5$) of optical pattern conditions to the brightness distribution of BLU with microlens patterned LGP. Finally, high aspect ratio microlens patterned LGP showed superior results to the one made by low aspect ratio in average luminance.
허영무(Y.M. Heo),장성호(S.H.Chang),신광호(S.H.Shin),김종덕(J.D.Kim),제태진(T.J.Je) 한국소성가공학회 2011 금형가공 심포지엄 Vol.2011 No.9
At present there are many studies are carried out to develop micro parts. A micro drive unit assembled with several micro movable parts is needed to industrialize the functional micro parts such as micro pump, micro-chip, micro motor and micro gear etc. In this study, making micro metal gear with outer diameter 500um, a powder injection molding process was used. To make micro metal part, it is needed micro shape cavity & core in molds for filling of feedstocks there are several methods to make micro shape or pattern such as LIGA process, laser machining, micro etching and micro milling process etc. But these micro methods are expensive and needed some special facilities to fabricate. So in this study, conventional machining methods were tested to make micro gear cavity shape. The preliminary studies were conducted to evaluate the filling of cavity and machine that. Finally outer diameter 500um level micro gear was injection molded and debinded and sintered. Some incomplete filling was occurred in the end of filling at gear teeth using 17-4PH 3F feedstock. The final sintered micro metal gear showed about 434um of outer diameter.