Research On Parameters And Mold Technology Of Microlens Array By Injection Compression Molding

Abstract:Polymer microlens array is one of the important optical elements in micro-optical system. However, microlens array fabricated by injection molding is found to have unacceptably large residual stress which seriously limit the range of usage. Injection-compression molding is a good method for producing low residual stress parts. This thesis use Moldflow/ICM and photoelastic experiment to research on the effect of parameters on the microlens array residual stress through single factor experiment and established a microlens array experimental platform which has important theoretical significance and application value for polymer microlens array mass fabrication.Firstly, injection compression molding analysis model is established. Moldflow/Injection-Compression Molding analysis module is used to show the distribution of residual stress throw Taguchi method. Variance analysis is used and evaluate that mold temperature and compression delay time are more significant than other parameters.Using single factor experiment to research on the effect of mold temperature, melt temperature, compression speed, compression distance, compression delay time and compression pressure to the residual stress of microlens array.Compression frame type of injection compression technology design concept is analyzed which cause the finding of the error in the existing injection compression mold. Based on the design standard of compression framed injection compression mold, the mold was redesigned to solve the matters of coordinate work between compression distance and thickness of microlens array, compression spring and compression frame, compression mechanism and ejection mechanism. Established an experimental platform by using the single point diamond technology.Injection compression experiments are made by taking single factor experiment method to research on the effects of residual stress of6parameter. Stress-optic law is used to switch the optical path difference to residual stress. It shows that with the increase of mold temperature, compression speed, the residual stress of the microlens array tended to decrease. With the increase of melt temperature, the residual stress goes down at first, then increased. the residual stress keep rising with the increase of compression delay time. There is little effect from the change of compression distance. These rules can provide processing guidance when manufactory the microlens array. There are50pictures,16tables and62references in the passage.