摘要
为了实现微型数字光处理(DLP)投影仪的超短投影距离的目的,先根据成像关系计算构建了非球面光学曲面的面型,再对投影镜头整体优化,设计了一个含有两片奇次多项式非球面的广角投影物镜。镜头的物方F=2,焦距4 mm,像方视场角128°,像方0.4 lp/mm(截止频率)处调制传递函数(MTF)大于0.6,最大畸变的绝对值0.9%,镜头总长100 mm,最大口径Φ=80 mm。设计结果表明,该设计方法可以使大角度、超短投影距离的投影镜头摆脱常用折反射式结构,全透射式的光学结构可以真正实现发光二极管光源照明DLP投影仪的微型化、投影距离超短化。
A wide field of view（FOV） lens,containing two odd polynomial aspheres, is designed to get a digital light procession（DLP） projector with a ultra-short throw ratio. The aspheres are calculated and fitted, then the lens is optimized totally. The lens has a F-number of 2, a focal length of 4 mm, a FOV of 1280, a maximum distortion of 0.9%, a total length of 100 mm, and a maximum cross-section diameter of Φ = 80 mm. And the modulation transfer function（MTF） is above 0.6 at 0.4 lp/mm（cutoff frequency） of all fields. The designing results indicate that the method can be applied to design a wide FOV and ultra- short totally refractive（TR） projection lens, which can substitute for the commonly used hybrid refractive-reflective（HRX） structure. This kind of TR lens can also be applied to mini light emitting diode DLP projectors with an ultra-short TR.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第12期234-239,共6页
Acta Optica Sinica
基金
国家863计划(2012AA10A503)
关键词
光学设计
投影显示
超短投射比
非球面
optic design
projection display
ultra-short throw ratio
aspheres
