针对电子助视器的使用要求,设计并开发出一款变倍比达9.3的有限远共轭距连续变焦光学系统,给出了光学系统的结构数据与性能评价,包括调制传递函数、点列图和弥散斑直径,通过公差灵敏度分析和蒙特卡罗法对光学系统容差能力进行了研究。光学系统采用机械补偿方式,分前固定组、变倍组、补偿组和后固定组,共11片透镜,光学筒长76 mm,前截距262 mm,可以实现8.8-52 mm的连续变焦,变焦轨迹平滑,整个变焦过程无渐晕,图像质量清晰稳定。

A 9.3× continuous zoom optical system with fixed finite conjugate distance was designed for E-vision aid device.By using optical design software,the configuration of the optical system and the evaluation of the optical performance including modulation transfer function,spot diagram and diffuse spot in diameter were investigated.The stability of the system performance was forecasted by using the tolerance sensitivity analysis and Monte Carlo method.This mechanically compensated zoom lens combines four group components including a fixed front element,moving variator,compensator,and a fixed rear element with a total of 11 pieces of lens.The optical system which has a tube length of 76 mm and a front intercept distance of 262 mm can realize continuous zoom from 8.8- 52 mm without any image vignetting or obvious fluctuation in image quality.