An electrically tunable depth-of-field endoscope using a liquid crystal lens as an active focusing element

Hung-Shan Chen; Ming-Syuan Chen; Yi-Hsin Lin

doi:10.1117/12.2025379

12 September 2013 An electrically tunable depth-of-field endoscope using a liquid crystal lens as an active focusing element

Hung-Shan Chen, Ming-Syuan Chen, Yi-Hsin Lin

Author Affiliations +

Proceedings Volume 8828, Liquid Crystals XVII; 88281C (2013) https://doi.org/10.1117/12.2025379
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

Abstract

An electrically tunable depth-of-field (DOF) endoscope using a liquid crystal lens (LC lens) as an active focusing element is demonstrated. The optical mechanism of the electrically-tunable DOF endoscope adopting a two-mode switching LC lens is introduced. The two-mode switching LC lens provides not only a positive lens power but also a negative lens power. Therefore, we could extend the range of DOF originally from 27 mm ~ 55 mm to 12.4 mm ~ 76.4 mm by using the two-mode switching LC lens as an active focusing element. The detail derivations of the optical mechanism of the endoscopic system adopting a LC lens are invistgated. The more detail experimental results are demonstrated. We believe this study can provide a more detail understanding of an endoscopic system adopting a tunable focusing lens.

Citation Download Citation

Hung-Shan Chen, Ming-Syuan Chen, and Yi-Hsin Lin "An electrically tunable depth-of-field endoscope using a liquid crystal lens as an active focusing element", Proc. SPIE 8828, Liquid Crystals XVII, 88281C (12 September 2013); https://doi.org/10.1117/12.2025379

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