Abstract
With the miniaturization and light-weight of photoelectric instruments, the original method to change the focal length of lens mechanically can't meet the requirements now. Then variable-focus lens without mechanical elements appears. In recent years, varieties of variable-focus lenses, which have variable surfaces radius or variable refractive index, are put forward. The variable-focus lenses with variable surface radius mainly include variable-focus double liquid lens based on EWOD, variable-focus lens based on hydraulic pressure, ultrasonic variable-focus optical lens and so on. The variable-focus lens with variable refractive index mainly includes liquid crystal lens. This article introduces these kinds of variable-focus lenses and expounds the problems to be solved. It also analyzes the developing trend of variable-focus lens. KEYWORDS: variable-focus lens, EWOD, variable-focus double liquid lens, hydraulic pressure liquid lens, ultrasonic variable-focus optical lens, liquid crystal lens
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