Autofocus Fluid Lens Device with Implementation of Dielectric Elastomer Actuators
H. Kivestea, H. Hausb, D. Gattib, H.F. Schlaakb, A. Aablooa, R. Kiefera
aUniversity of Tartu, Tartu, Estonia
bTechnische Universität Darmstadt, Darmstadt, Germany
We produced an autofocus liquid lens based on meniscus changes of an oil/water interface caused by fieldinduced deformation of a dielectric elastomer stack actuator (DESA). The new DESA design integrated in the liquid lens is based on a circular actuator with a round hole in the middle (diameter: 4 mm) where the oil/water interface is located. Due to the surface tension between the two immiscible liquids (oil/water) a meniscus forms in proximity of the hole of the actuator membrane that can operate as a lens. The goal of this research was to apply and investigate encapsulated dielectric elastomer actuators (DEA) in liquid environments for producing a
prototype autofocus lens. When the DEA membrane is applied a high voltage, the hole dimension changes by contraction of the DEA membrane, together with the curvature of the meniscus formed between oil and water. Consequently, the focus plane of a laser beam passing through the liquid lens changes. Configurations with DESA actuator or single-layered membranes are tested. Depending on the DEA membrane thicknesses (45 to 100 μm), the maximum applied voltage varied from 1150 to 2250 V.
ACTUATOR 2014 Manuscript C1.4
Publication date: 09/04/2015
Manuscript C1.4 published in Conference Proceedings ACTUATOR 2014
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