短焦数字投影镜头的光学设计

陈琛; 李维善; 张禹; 刘宵婵

doi:doi:10.3788/gzxb20114012.1855

光子学报, 2011, 40 (12): 1855, 网络出版: 2012-01-04

短焦数字投影镜头的光学设计

Optical Design of Short Focal Digital Projection Lens

论文大纲

陈琛 ^*李维善张禹刘宵婵

作者单位

秦皇岛视听机械研究所，河北秦皇岛 066000

光学设计短焦数字投影镜头反远距结构非球面 Optical design Short focal Digital projection lens Retrofocus structure Aspheric surface

摘要

为了满足短焦投影市场的需求，利用ZEMAX光学软件开发设计出了一款适用于0.8英寸单片数字光处理投影机的短焦数字投影镜头.该镜头总长172.6 mm，全口径70 mm，采用反远距结构，由6组7片透镜组成，其中包括6片玻璃透镜和1片塑料透镜（两个偶次非球面）.镜头全视场达到80°，相对孔径为1/2.1，反远比（工作距离/焦距）为3.17∶1，投射比达到0.76∶1，在空间频率极限37 lp/mm处，0.707以内视场的调制传递函数值均大于0.6，垂轴色差小于3.5 μm，在0.5像素尺寸之内，全视场畸变低于1.1%.该镜头具有结构简单、体形小、易加工、成本低等优点.

Abstract

To meet the requirement of market, a short focal digital projection lens for 0.8 inch digital light processing(DLP) projectors is designed. The total length is 172.6 mm, and the full aperture is 70 mm. The lens uses a retrofocus structure, and it is composed of six glass lenses and one plastic lens (two even aspheric surfaces). Its FOV is 80°, F-number is 2.1, retrofocus proportion is 3.17∶1, and projection ratio is 0.76∶1. Its MTF in all field is less than 28° that is higher than 0.6 at the limiting spatial frequency of 37 lp/mm. The lateral color is less than 3.5 μm. The distortion of the full of view is less than 1.1%. Its image quality is excellent with advantages of simple structure, small size, easy process and low cost.

参考文献

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陈琛, 李维善, 张禹, 刘宵婵. 短焦数字投影镜头的光学设计[J]. 光子学报, 2011, 40(12): 1855. CHEN Chen, LI Wei-shan, ZHANG Yu, LIU Xiao-chan. Optical Design of Short Focal Digital Projection Lens[J]. ACTA PHOTONICA SINICA, 2011, 40(12): 1855.

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