针对大视场投影镜头的设计问题, 利用ZEMAX光学设计软件, 通过各种操作数对镜头的基本参数和外形尺寸进行限制, 并利用镜头架构的方式进行优化及大视场投影镜头的设计。其主要光学参量为: 焦距为13.6 mm, 全视场角为60°, 相对孔径为1/1.6。设计结果表明: 镜头的最大畸变量绝对值小于3% , 最大场曲小于0.06 mm, 全视场MTF值在空间频率50 lp/mm时高于0.6, 基本达到衍射极限。该镜头由10片球面镜组成, 光学系统结构紧凑、易加工。

For the problem about the design of large field-of-view(FOV) projection lens, a projection lens with large FOV was designed with ZEMAX through limiting the basic parameters and dimensions of the lens by various operating parameters. The optimization process was carried on by using lens frame. The main optical parameters are such that the focal length is 13.6 mm, the full FOV is 60°, the relative aperture is 1/1.6. From the result we can see that the absolute value of maximum distortion of full field lens is less than 3%, the maximum field curve is less than 0.06 mm, the modulation transfer function( MTF) of the whole FOV at 50 lp/mm is greater than 0.6,which is very closed to diffraction limit. The designed optical system is composed of 10 pieces of spherical lenses and has the advantages of compact structure and easy processing.