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Proceedings Paper

Temperature compensation analysis of liquid lens for variable-focus control
Author(s): Shu-Jung Chen; Tsai-Lin Tai; Chih-Hsiung Shen
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Paper Abstract

In this work, a fabrication and temperature compensation analysis and electrowetting for the liquid lenses is proposed. The unique capability of controlling the lens profile during the electrowetting fabrication processes is successfully demonstrated for different ambient temperature environment. For a lens fabricated on a hydrophobic Teflon layer, it is found that when the applied voltage is increased, the focal length increases, and the curvature decreases. One challenge for the liquid lens is operating temperature range. Due to the environment temperature change, the ability of controlling the lens profile is analyzed and measured. The description of change in contact angle corresponding to the variation of ambient temperature is derived. Based on this description, we firstly derive the control of voltage vs. temperature for a fixed dioptric power. The control of lens during a focusing action was studied by observation of the image formed by the light through the transparent bottom of ITO glass. Under several conditions of ambient temperature change, capability of controlling the lens profile for a fixed focus is successfully demonstrated by experiments.

Paper Details

Date Published: 5 January 2006
PDF: 8 pages
Proc. SPIE 6111, Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS V, 61110S (5 January 2006); doi: 10.1117/12.644456
Show Author Affiliations
Shu-Jung Chen, National Changhua Univ. of Education (Taiwan)
Tsai-Lin Tai, National Changhua Univ. of Education (Taiwan)
Chih-Hsiung Shen, National Changhua Univ. of Education (Taiwan)


Published in SPIE Proceedings Vol. 6111:
Reliability, Packaging, Testing, and Characterization of MEMS/MOEMS V
Danelle M. Tanner; Rajeshuni Ramesham, Editor(s)

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