透镜转像式军用瞄准镜物镜设计

为了满足瞄准镜体积小、重量轻的要求，需要物镜采用摄远型结构。分析了摄远型透镜转像式物镜的光学特性与像差特点，提出了摄远型镜组、正场镜和对称式转像镜组构成的结构型式。依据系统的成像特性，推导了光焦度分配和外形尺寸计算公式。采用光学设计软件Zemax设计了摄远型透镜转像式物镜，系统焦距为-100 mm，入瞳直径为25 mm，视场角为8，系统总长仅为99.92 mm。设计结果表明，采用该方法设计的瞄准镜物镜在40 lp/mm处各个视场的调制传递函数均在0.2以上，满足目视光学仪器的使用要求。

Design of objective with relay lens used in military sighting telescope

To meet the small size and light weight requirement of the sighting telescope, the objective using the telephoto type structure was needed. The optical characteristics and aberration characteristics of telephoto lens with relay lens were analyzed, the configuration of telephoto lens, positive field lens, and symmetric relay lens was proposed.According to the imaging features of the system, the optical power distribution formula and dimension calculation formula were derived. The telephoto lens with relay lens was designed with optical design software Zemax, the focal length was -100 mm,the entrance pupil diameter was 25 mm, the view angle was 8, and the total length was only 99.92 mm. Designing results show that the modulation transfer function of every field is above 0.2 at 40 lp/mm, satisfing the application requirements of visual optical instrument.