便携式投影仪投影物镜设计

Design on projection objective of portable projector

针对当前投影仪光源功耗大,光投影稳定性差,系统结构大的缺点,利用Zemax软件,设计出了一款大视场,短焦距,结构紧凑,适用于便携式投影仪的投影物镜系统。经过优化处理,最终获得的结构具有良好的成像质量,在空间频率为80lp/mm处中心视场MTF≥0.7,0.8视场MTF≥0.6,边缘视场处MTF≥0.48,畸变小于3%,满足给出的设计指标。并且在规定和要求的像元尺寸范围内能量集中度大于85%,照度曲线0.8倍视场以内整体高于90%,能量集中度高,照度均匀性好,与便携式投影仪能很好地搭配使用。

In view of the shortcomings of current projectors such as large light source power consumption,poor light projection stability and large system structure,using Zemax software,a large field of view(FOV),short focal length and compact projection system for portable projectors was designed.After optimization,the design structure was finally obtained with good imaging quality.At the spatial frequency of 80 lp/mm,the central FOV modulation transfer function(MTF)is≥0.7,the 0.8 FOV MTF is≥0.6,the edge FOV MTF is≥0.48,and the distortion is less than 3%,which can satisfy the design indicators given.Moreover,the energy concentration is greater than 85%in the specified and required pixel size range,the overall illumination curve is higher than 90%within 0.8 FOV,the energy concentration is high,and the illumination uniformity is good,which can be well matched with the portable projector for use.