Open AccessBiomimetic variable-focus lens system controlled by winding-type SMA actuator
Author(s) -
Ju Chan Choi,
Hyung-Min Son,
YunJung Lee
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.008152
Subject(s) - actuator , lens (geology) , optics , sma* , focus (optics) , materials science , focal length , voice coil , shape memory alloy , physics , computer science , electromagnetic coil , artificial intelligence , algorithm , quantum mechanics , metallurgy
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.