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Direct writing 기법을 이용한 유기태양전지용 격벽 stamper 금형 제작 및 성형에 관한 연구
황철진,김종선,홍석관,오정길,강정진,Hwang, C.J.,Kim, J.S,Hong, S.K.,Oh, J.G.,Kang, J.J. 한국금형공학회 2008 한국금형공학회지 Vol.2 No.6
Polymer solar cells are a type of organic solar cell (also called plastic solar cell), or organic photovoltaic cell that produce electricity from sunlight using polymers. It is a relatively novel technology, they are being researched by universities, national laboratories and several companies around the world. In this paper, stamping mold of barrier ribs for polymer solar cells was manufactured by lithography and electroforming which can control the height of pattern and 80nl of barrier ribs was manufactured by using hot embossing.
휴대폰용 2 인치 LCD-BLU의 광특성에 미치는 음각 및 양각 광학 패턴의 영향 연구 : Ⅱ. 금형 및 광특성
황철진(C. J. Hwang),고영배(Y. B. Ko),김종선(J. S. Kim),민인기(I. K. Min),유재원(J.W. Yu),윤경환(K. H. Yoon) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Recently, many researches have been done to improve optical performance of LCD-BLU(Back Light Unit). One of the most important parts in LCD-BLU is LGP(Light Guiding Plate). Micro-patterned LGP is known to have different optical characteristics depending on their shape, pattern density and size, etc. In the present study, a micro-optical patterned LGP mold was fabricated using LiGA process. The difference in the optical characteristics between positive and negative patterned LGP’s was investigated by fixing the density, location and size of each pattern. It was found that the negative patterned LGP showed better optical characteristics than positive one.
황철진(C. J. Hwang),김종선(J. S. Kim),정철(C. Jeong),안희정(H.-J. An),허영무(Y. M. Heo),허영무(Y. M. Heo),김종덕(J. D. Kim),윤경환(K. H. Yoon) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
Because of steep rise of international energy cost in recent years, high efficiency has been emphasized in energy policy. As far as injection molding machine is concerned, hybrid method using hydraulic and electric systems became the key to this energy saving. The energy saving and molding reproducibility of hybrid injection molding process were shown experimentally. The power consumption of hybrid injection molding machine is reduced to 38% as compared with that of hydraulic machine. Furthermore, the molding reproducibility was shown for both methods.
박판(0.3mm) 도광판 성형을 위한 유압식 고속사출성형의 성형 안정성 연구
황철진(C. J. Hwang),김종선(J. S. Kim),오정길(J. G. Oh),정철(C. Jeong),안희정(H.-J. An),허영무(Y. M. Heo),김종덕(J. D. Kim),윤경환(K. H. Yoon) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.8
Recently, products of electronic industry and related parts are required to have the thickness thinner and thinner to reduce the part weight. To go with this trend, LGP(light guide plate) of LCD-BLU(Liquid Crystal Display-Back Light Unit: It is one of kernel parts of LCD) for cell phone has the thickness of ~0.3mm and the battery case of cell phone has ~0.25mm. Accordingly, high speed injection molding is required to mold products which have thinner parts. To achieve high speed injection and proper control of hydraulic unit, various design was applied to conventional injection unit. In the present paper, we concentrated on the molding stability of hydro-mechanical high speed injection machine to make an LGP of 0.3mm thickness.