大孔径大视场变焦投影镜头设计

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2 000 mm处可投射出190.5 cm(75英寸)画面, 光学系统总长小于160 mm, 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。

Design of zoom projection lens with large aperture and wild view

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 71lp/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.