军用长出瞳距狙击步枪瞄准镜远心光路设计

Telecentric Light Path Design for Sniper Rifle Telescopic Sight with Long-Eye Distance

为了适应单兵平台的作战需求,针对目前透射式狙击步枪瞄准镜存在成像质量较差和出瞳距离过短等问题,设计一款高精度成像的狙击步枪瞄准镜。根据系统的设计指标对物镜组和目镜组进行指标分解以及光焦度计算,使用ZEMAX软件设计具有高精度成像质量和长出瞳距离的瞄准镜光路。瞄准镜的物镜组和目镜组均采用远心光路,系统的放大倍率为10×,入瞳直径为50 mm,出瞳直径为5 mm,视场角为2.2°,出瞳距离为87.89 mm,机械筒长为403.76 mm。设计结果表明,物镜组和目镜组的成像质量均达到优良,对接后的整体光路在奈奎斯特频率为16.67 lp/mm处的调制传递函数值大于0.85,满足军用狙击步枪瞄准镜的使用要求。

Considering the combat demands of an individual soldier and focusing on the poor imaging quality and very short exit pupil distance of current transmission sniper rifle scopes,a long-eye distance high-precision imaging sniper rifle scope is designed.Based on the design indices of the system,the objective and eyepiece sets are decomposed and the optical focal degree is calculated.The optical path of the scope is designed using ZEMAX software.The objective and eyepiece sets of the scope adopted a telecentric optical path.The magnification of the system is 10×,the diameters of the incoming pupil and exit pupil are 50 mm and 5 mm,respectively,the field of view angle is 2.2°,the distance of the exit pupil is 87.89 mm,and the length of the mechanical cylinder is 403.76 mm.The design results show that the imaging quality of the objective lens and ocular lens is excellent.Moreover,the modulation transfer function value of the whole optical path after docking is greater than 0.85 at Nyquist frequency of 16.67 lp/mm,which meets the requirements of a military sniper rifle scope.