非球面プラスチックレンズ金型の樹脂収縮変形補正に関する一手法

概要

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Aspherical plastic lenses for laser apparatus need submicron accuracy in the shape profile of injection molded parts. In the molding process, polymer changes from molten state to glassy state, and the cooling history of each point is different. These phenomena causes irregular shrinkage deformation. Usually, the mold shape is corrected overall using a constant shrinkage ratio. So it is difficult to develop highly shape accurate molded parts. In order to obtain better shape accuracy, shrinkage amounts must be computed exactly and the shape of mold must be corrected. Shrinkage amounts are computed from shape difference between the mold's shape and the shape of trial molded parts. The shapes of mold and molded parts are computed from regression of measuring data. This paper describes the shape regression algorithm, the correcting algorithm of mold, and the application of this method to aspherical lens's molds. Experiment shows that plastic lenses with a shape error of less than 0.3 μm can be molded.
社団法人精密工学会の論文
1992-02-05