为了满足大孔径大视场变焦投影镜头的市场需求,基于Zemax光学软件设计一款连续变焦的投影镜头,变焦范围为16.27 mm ～22.77 mm,视场角为63.7°～47.8°,F数为1.75～1.95,配合1.55 cm(0.61英寸)LCOS投影显示芯片使用,在工作距离2 000mm处可投射出190.5 cm(75英寸)画面,光学系统总长小于160mm,由10片透镜组成,其中包括8片玻璃透镜和2片塑料透镜.设计结果表明:镜头在空间极限频率71 lp/mm处,各个焦段的MTF值均大于0.5,场曲都在0.1 mm之内,畸变小于3％,成像质量良好.最后对光学系统进行了公差分析,得出一组较宽松的公差.%To meet the market demand of large aperture and wide field zoom projection lens,we designed a zoom lens based on ZEMAX optical software.The zoom range is 16.27 mm ～22.77mm,its field of view (FOV) is 63.7°～47.8°,the F number is 1.75-1.95.Working with a 1.55 cm (0.61 inch) LCOS projection display chip,a 190.5 cm(75 inch) picture can be projected at a distance of 2000mm.The total length of optical system is less than 160mm,it is composed of 10 lenses,which include 8 glass lenses and 2 plastic lenses.Design results show that at the space frequency limit 711p/mm,the full FOV MTF is greater than 0.5 and the field curvature of each zoom section is within 0.1mm,the distortion is within 3％,and the imaging quality is good.Finally,we conducted the tolerance analysis of the optical system,and obtained a set of loose machining tolerances.
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