Biomimetic variable-focus lens system controlled by winding-type SMA actuator.
Inspired by the biomechanics of the human eye, which includes a crystalline lens, ciliary muscles, and zonular fibers, the proposed variablefocus lens system consists of a PDMS lens, winding-type SMA actuator, and load arms. The PDMS lens is encircled and stretched by the load arms joined to an outer ring that is rotated by the winding-type SMA actuator, thereby changing the focal length of the lens. In contrast to other single tunable-focus lenses, the proposed system uses a gel-type PDMS lens, which is insensitive to gravity and external vibration, and can be made into a biconvex or aspheric shape. The design of the proposed system is described in detail, and experimental results demonstrate the validity of the proposed system.
Choi
Jong-Moon
JM
School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu, Korea.
Son
Hyung-Min
HM
Lee
Yun-Jung
YJ
D000497:Alloys / Q000737:chemistry*; D040761:Biomimetic Materials / Q000138:chemical synthesis*; D004129:Dimethylpolysiloxanes; D005403:Fixation, Ocular; D006801:Humans; D007908:Lens, Crystalline
D000497:Alloys; D004129:Dimethylpolysiloxanes