| Summary: | 碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 95 === The general material usage for large-diameter optical lens has been glass. However in order to achieve the objective with minimum size and weight for the product, the large-diameter aspherical plastic optical lens starts to be in consideration of more and more applications.
This thesis is to analyze the associated parameters of shape precision and bi-refractive index which will influence the large-diameter aspherical plastic optical lens. This is a projector project using an 46 mm diameter spherical plastic optical lens made by PC (Polycarbonate) material. With using mold flow analysis software (Moldex 3D) and aspherical analysis software (AAU=Aspherics Analysis Utility), we can have an optimum condition with X-axis and Y-axis symmetrized, so as to find out the root cause of influencing the shape precision and bi-refractive index.
Per the experiment data, the key factors to impact on the bi-refractive index are the mold temperature and screw temperature, and next the molding parameters setting. And the key factor to impact on the surface accuracy of the aspherical plastic lens are, in order, the holding time, holding pressure, mold temperature, screw temperature, cooling time, injection speed…etc.
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