12 September 2013 An electrically tunable depth-of-field endoscope using a liquid crystal lens as an active focusing element
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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.
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Hung-Shan Chen, Hung-Shan Chen, Ming-Syuan Chen, Ming-Syuan Chen, Yi-Hsin Lin, 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); doi: 10.1117/12.2025379; https://doi.org/10.1117/12.2025379
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