Yu Baihua, Tian Zhihui, Su Dongqi, Sui Yongxin, Yang Huaijiang
Appl Opt. 2019 May 1;58(13):3575-3581. doi: 10.1364/AO.58.003575.
A refractive-reflective combined ultrashort throw ratio projection optical system is designed. We use a freeform mirror to shorten the projection distance and correct distortion, and a plane mirror to turn back the optical path and reduce system volume. The projection system design method combines refractive lens group design and freeform surface mirror design with integrated optimization. The system's throw ratio is 0.11 with a projection distance of 320 mm and a 130 in. (1 in.=25.4 mm) screen size, which illustrates the advantages of the low throw ratio. The system's maximum distortion is 0.07%. To demonstrate the proposed system's performance, a prototype is developed. Experimental results confirm that the system performs excellently while meeting the design requirements. The system's advantages include low throw ratio, excellent imaging quality, miniaturization, and engineering feasibility.
设计了一种折反射组合式超短焦比投影光学系统。我们使用自由曲面镜来缩短投影距离并校正畸变，使用平面镜来折返光路并减小系统体积。投影系统设计方法将折射透镜组设计和自由曲面镜设计进行集成优化。该系统的焦比为0.11，投影距离为320毫米，屏幕尺寸为130英寸（1英寸 = 25.4毫米），这体现了低焦比的优势。系统的最大畸变为0.07%。为了验证所提出系统的性能，开发了一个原型。实验结果证实该系统在满足设计要求的同时性能出色。该系统的优点包括低焦比、出色的成像质量、小型化和工程可行性。
