Injection Compression Molded Microlens Arrays for Hyperspectral Imaging.

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ID: 59833
2018
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Abstract
In this work, a polymer microlens array (MLA) for a hyperspectral imaging (HSI) system is produced by means of ultraprecision milling (UP-milling) and injection compression molding. Due to the large number of over 12,000 microlenses on less than 2 cm², the fabrication process is challenging and requires full process control. The study evaluates the process chain and optimizes the single process steps to achieve high quality polymer MLAs. Furthermore, design elements like mounting features are included to facilitate the integration into the final HSI system. The mold insert was produced using ultraprecision milling with a diamond cutting tool. The machining time was optimized to avoid temperature drifts and enable high accuracy. Therefore, single immersions of the diamond tool at a defined angle was used to fabricate each microlens. The MLAs were replicated using injection compression molding. For this process, an injection compression molding tool with moveable frame plate was designed and fabricated. The structured mold insert was used to generate the compression movement, resulting in a homogeneous pressure distribution. The characterization of the MLAs showed high form accuracy of the microlenses and the mounting features. The functionality of the molded optical part could be demonstrated in an HIS system by focusing light spectrums onto a CCD image sensor.
Reference Key
roeder2018injectionmicromachines Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Roeder, Marcel;Drexler, Marc;Rothermel, Thilo;Meissner, Thomas;Guenther, Thomas;Zimmermann, André;
Journal micromachines
Year 2018
DOI
E355
URL
Keywords
hyperspectral imaging injection compression molding microlens array microstructures polymer optics ultraprecision milling detection cognitive communication digital channelizer interference cancellation satellite communication

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