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Atre, Sundar V.;Wu, Carl L.;Hwang, Chul-Jin;Zauner, Rudolf;Park, Seong-Jin;German, Randall M.
- Proceedings of the Korean Powder Metallurgy Institute Conference
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- 2006.09a
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- pp.45-46
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- 2006
In recent years, micro powder injection molding $(\mu-PIM)$ is being explored as an economical fabrication method for microcomponents in microsystems technology (MST). Technical and economic comparison was performed for $\mu-PIM$ processes. Molding experiment and simulation during the filling process were performed to evaluate several different geometries and processing conditions. The influence of material parameters and process conditions on mold filling were examined as a function of features size using microchannels as an example. It was found that the heat conductivity and viscosity of feedstock, geometry and mold temperature were the most critical parameters for complete filling of micro features.
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Hwang C.J.;Kim J.D.;Chung J.W.;Ha S.Y.;Lee K.H.
- Proceedings of the Korean Society for Technology of Plasticity Conference
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- 2004.05a
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- pp.241-244
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- 2004
Microlens patterned micro-mold fabrication method for Light Guiding Plate(LGP), kernel part of LCD-BLU(Back Light Unit), was presented. Instead of erosion dot pattern for LCP optical design, microlens pattern, fabricated by LIGA-reflow process, was applied. Optical pattern design method was also developed not only for negative pattern LGP, but also positive pattern LGP. In order to achieve flow balance during the micro-injection molding process and dimensional accuracy, two LGP pattern was made in one micro-mold.
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Je, T.J.;Lee, E.S.;Choi, D.S.;Kim, J.G.;Whang, K.H.;Yoon, J.S.;Chang, S.H.
- Proceedings of the Korean Society for Technology of Plasticity Conference
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- 2009.05a
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- pp.74-77
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- 2009
Demands for high quality and productivity of precision mechanical parts are increasing greatly nowadays due to the rapid growth of information technologies and convergence industries. Therefore, core technologies for fabrication of precision mechanical parts are the fundamental issues, which are the precision machining, micro powder injection molding technologies, MR polishing, micro polymer processes, micro actuation modules and so on. These technologies are directly related to the mass production of high functional devices and machineries. Therefore, this study investigates the fabrication technologies of micro precision molds for advanced devices for possible commercialization in a near future.
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Yoo Y.E;Seo Y.H;Je T.J.;Choi D.S
- Proceedings of the Korean Society of Precision Engineering Conference
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- 2005.06a
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- pp.216-219
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- 2005
In recent, LCD becomes one of the main display devices and expected to have quite good market share during the next couple of years. The demand for low cost and high performance, however, is becoming severe as the competition among other display devices like PDP, OLED increases. To satisfy this demand from market, we need to optimize the parts or modules of the LCD, reduce the number of the assemble and enhance the process for the high brightness and uniformity of the LCD. The LCD consists mainly of LCD panel and Backlight unit(BLU). BLU, which takes big portion of the cost for LCD, consists of light source, light guide panel and many kinds of functional film. Recently light guide panel or film for BLU has micro patterns on its surface and consequently to reduce the number of parts and enhace the brightness and its uniformity. In this study, some methodologies for the fabrication of the master/stamper and molding the light quide panel are introduced for 50um pitch of prizm patterned substrate. Mechanical machining process is adapted and optimized to fabricate micro patterned stamper using the micro cutting tool. Injection molding technology is also developed to obtain uniformly replicated micro patterned products.
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