Process influences and correction possibilities for high precision injection molded freeform optics

被引：9
|
作者：
Dick, Lars [1 ]
Risse, Stefan [2 ]
Tuennermann, Andreas [2 ,3 ]
机构：
[1] JENOPTIK Polymer Syst GmbH, JENOPTIK Healthcare & Ind, Sandberg 2, D-07819 Triptis, Germany
[2] Fraunhofer Inst Appl Opt & Precis Engn IOF, Albert Einstein Str 7, D-07745 Jena, Germany
[3] Friedrich Schiller Univ Jena, Abbe Ctr Photon, Inst Appl Phys, Albert Einstein Str 15, D-07745 Jena, Germany
来源：
ADVANCED OPTICAL TECHNOLOGIES | 2016年 / 5卷 / 04期
关键词：
birefringence; freeform optics; injection molding; plastic optics; polymer; ultra-precision manufacturing;
D O I：
10.1515/aot-2016-0023
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Modern injection molding processes offer a cost-efficient method for manufacturing high precision plastic optics for high volume applications. Besides form deviation of molded freeform optics, internal material stress is a relevant influencing factor for the functionality of a freeform optics in an optical system. This paper illustrates dominant influence parameters of an injection molding process relating to form deviation and internal material stress based on a freeform demonstrator geometry. Furthermore, a deterministic and efficient way for 3D mold correcting of systematic, asymmetrical shrinkage errors is shown to reach micrometer range shape accuracy at diameters up to 40 mm. In a second case, a stress-optimized parameter combination using unusual molding conditions was 3D corrected to reach high precision and low stress freeform polymer optics.
引用
收藏
页码：277 / 287
页数：11
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