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*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

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.

Original languageEnglish
Title of host publicationLiquid Crystals XVII
DOIs
StatePublished - 4 Nov 2013
EventLiquid Crystals XVII - San Diego, CA, United States
Duration: 25 Aug 201328 Aug 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8828
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceLiquid Crystals XVII
CountryUnited States
CitySan Diego, CA
Period25/08/1328/08/13

Keywords

  • Depth of field
  • DOF
  • Endoscope
  • Liquid Crystal Lens

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