Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Generation of Micro Lenslet Arrays using High Efficiency Synchronized Diamond Milling

Nicholas Yew Jin Tana, Rui Huang, Dennis Wee Keong Neo and Kui Liu

Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore


With functional surfaces gaining much attention due to their ability to effectively and passively enhance the performance of the components that they are coupled with, the need for high efficiency fabrication techniques is needed to be able to meet the demands of the industry. However, current fabrication techniques for micro lenslet arrays are relatively slow, especially so for planar surfaces. The fine diamond tips used in Single Point Diamond Turning requires the tool to travel long cutting distances to cover the surface, despite using enabling technologies like the fast tool servo. Diamond milling on the other hand is slow due to the need for tool indexing at each position. This introduces non-productive time into the process, reducing the overall efficiency of fabricating lens arrays. High Efficiency Synchronized Diamond Milling (HESDM) avoids much of the non-productive indexing time by leveraging on the high frequency duty cycle of the milling spindle. With a reciprocating workpiece, the relative motions would allow for synchronous machining and indexing of micro lenslets, producing them at high speeds. Thus, in this study, the parameters that influence the generated features are studied, producing a micro lens array mold using the HESDM process.

Keywords: Functional Surfaces, Micromilling, Ultra-precision, Optical

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