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.
School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu, Korea.
Jong-Moon
JM
Choi
Hyung-Min
HM
Son
Yun-Jung
YJ
Lee
D000497:Alloys / Q000737:chemistry*; D040761:Biomimetic Materials / Q000138:chemical synthesis*; D004129:Dimethylpolysiloxanes; D005403:Fixation, Ocular; D006801:Humans; D007908:Lens, Crystalline
D000497:Alloys; D004129:Dimethylpolysiloxanes