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Proceedings Paper

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

Paper Details

Date Published: 12 September 2013
PDF: 11 pages
Proc. SPIE 8828, Liquid Crystals XVII, 88281C (12 September 2013); doi: 10.1117/12.2025379
Show Author Affiliations
Hung-Shan Chen, National Chiao Tung Univ. (Taiwan)
Ming-Syuan Chen, National Chiao Tung Univ. (Taiwan)
Yi-Hsin Lin, National Chiao Tung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 8828:
Liquid Crystals XVII
Iam Choon Khoo, Editor(s)

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