Liquid lens of fast focusing is valuable to be researched for the application in instruments of
miniature. According to many researchers achievement in this field, the fast focusing mechanism of
liquid lens is firstly present. Then the oscillation modes of the liquid-solid coupling liquid lens in
different capillary tube cases are analyzed in this paper. For better understanding of the fast focusing
mechanism and its influencing factors, finite element models of the water droplet lens are set up in
ANSYS, and the former four oscillation modes are solved to analyze the relative influencing relations.
The work in this paper will lay a foundation for the further research on the liquid lens of fast focusing.
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