4k数字放映机广角放映镜头的设计  

Design of wide-angle projection lens for 4k digital projector

作　　者：刘宵婵 陈琛 宋涛 张禹 李维善 刘红军 

机构地区：[1]秦皇岛视听机械研究所,河北秦皇岛066000

出　　处：《应用光学》2014年第3期400-403,共4页Journal of Applied Optics

基　　金：科技部研究院所技术开发研究专项基金(2010EG119161;2011EG119199)

摘　　要：为满足4k电影的短距离放映需求,设计一款广角放映镜头,可适配于采用三芯片DMD技术的放映机,最大投射比可达0.75∶1,相对孔径为1/2.2,反远比为4.6∶1,在66lp/mm的Nyquist频率处,MTF值为0.42,边缘视场MTF值为0.25。最大横向色差为3.7μm<0.5pixel,最大畸变为2.5%。分析了反远距形式的特点,给出了合理选型、分配光焦度和计算关键技术参数的方法,以及像差校正过程中应注意的问题。最终设计出了符合设计指标的具有高分辨率的广角放映镜头,该镜头结构简单、成本低。To meet the need of 4k short distance movie projection ,a wide-angle projection lens was designed ,which is suitable for projectors with three-digital-micromirror-device (DMD) chips .The largest projection ratio could be 0 .75∶1 ,the relative aperture is 1/2 .2 ,the invert-ed telephoto ratio is 4 .6∶1 .At the Nyquist frequency of 66lp/mm ,the resolution of center field is 0 .42 ,and the resolution of marginal field is 0 .25 .T he max lateral chromatic aberration is 3 .7 μm ,w hich is less than 0 .5 pixel ,and the max distortion is 2 .5% .T he feature of invert-ed telephoto was deeply analyzed ,and the methods for choosing structure ,distributing focal power and calculating key parameters were provided in the paper ,additional ,the issues nee-ding pay attention during aberration correction were contained .Finally ,a wide-angle projec-tion lens with high resolution which could meet all the indices was designed ,besides that ,the lens has the feature of easy structure ,low cost and high quality .

关 键 词：光学设计 反远距 广角 成像系统 调制传递函数 

分 类 号：TB857.1[一般工业技术—摄影技术]