Ms. Tin Wang Profile

Tin Wang

at Wenzhou Medical Univ

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Proceedings Article | 5 November 2020 Paper

Diamond turning of gap-masked lens array on curved substrate

Yiyu Li, Tin Wang, Siyun Chen, Xiaoli Hu, Haihua Feng, Hao Chen

Proceedings Volume 11568, 115680L (2020) https://doi.org/10.1117/12.2576226

KEYWORDS: Surface finishing, Diamond turning, Coating, Spherical lenses, Lens design, Spindles

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The unwanted light transmitting through the gap spaces of low fill factor lens array will deteriorate the signal contrast detected by the sensor. The high cost photolithographic techniques and optical coating technology have to be used to deposit a metallic film precisely filling these gap regions, which is only suitable for the lens array on flat substrate. In this paper, we will propose an efficient way for the fabrication of gap-masked lens array on a curved plastic substrate by using the direct diamond turning and spray coating process. The semi-finished lens array (SFLA) on a convex surface is first fabricated by rough cutting with fast tool servo. A paint film layer with mirror surface effect is then formed uniformly by spray coating on the SFLA which has a rotation speed controlled by the computer-numerically controlled (CNC) machine. At last, the lenslet surfaces are uncovered and regenerated by finishing cutting process. Without any reloading or re-position error, this cost-effective method can generate various gap-masked array optics on curved substrate with customized period and grid pattern.

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