MEMS-based liquid lens for capsule endoscope

S. W. Seo, S. Han, J. H. Seo, Y. M. Kim, M. S. Kang, N. G. Min, W. B. Choi, M. Y. Sung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)


The capsule endoscope, a new application area of digital imaging, is growing rapidly but needs the versatile imaging capabilities such as auto-focusing and zoom-in to be an active diagnostic tool. The liquid lens based on MEMS technology can be a strong candidate because it is able to be small enough. In this paper, a cylinder-type liquid lens was designed based on Young-Lippmann model and then fabricated with MEMS technology combining the silicon thin-film process and the wafer bonding process. The focal length of the lens module including the fabricated liquid lens was changed reproducibly as a function of the applied voltage. With the change of 30V in the applied bias, the focal length of the constructed lens module could be tuned in the range of about 42cm. The fabricated liquid lens was also proven to be small enough to be adopted in the capsule endoscope, which means the liquid lens can be utilized for the imaging capability improvement of the capsule endoscope.

Original languageEnglish
Title of host publicationNanosensors and Microsensors for Bio-Systems 2008
Publication statusPublished - 2008
EventNanosensors and Microsensors for Bio-Systems 2008 - San Diego, CA, United States
Duration: 2008 Mar 112008 Mar 13

Publication series

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


OtherNanosensors and Microsensors for Bio-Systems 2008
Country/TerritoryUnited States
CitySan Diego, CA


  • Capsule endoscope
  • Electrowetting
  • Liquid lens
  • MEMS
  • Variable focus

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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