Variable Focus Liquid Lens by Changing Aperture Size

3 Variable Focus Liquid Lens by Changing Aperture Size 

Ren et al. presented a design to vary the focal length of a liquid lens by changing its aperture size [14,15]. A lever actuator was used to control the movement of rotatable impellers that in turn imparted a pressure on the fluid-filled lens. Thus, the redistributed liquid changed the lens curvature and tuned the focal length. 

Focal lengths of the cylindrical lenses focusing light along the x-axis (squares) and y-axis (crosses) are shown as functions of the pressure differences, AP and AP respectively. Reprinted from [13] with permission from Optical Society of America. 

Cross-sectional view of the liquid lens cell with (a) no focusing effect with aperture radius Tq and (b) focusing effect with aperture radius r Tq. Source Ren, H. and S.T. Wu. 2005. Applied Physics Letters, 86(21), 211107. With permission.) 

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