CAJ | 학술논문

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。
위만족4k전영적단거리방영수구，설계일관엄각방영경두，가괄배우채용삼심편DMD기술적방영궤，최대투사비가체0．75∶1，상대공경위1/2．2，반원비위4．6∶1，재66lp/mm적Nyquist빈솔처，MTF치위0．42，변연시장MTF치위0．25。최대횡향색차위3．7μm＜0．5pixel，최대기변위2．5％。분석료반원거형식적특점，급출료합리선형、분배광초도화계산관건기술삼수적방법，이급상차교정과정중응주의적문제。최종설계출료부합설계지표적구유고분변솔적엄각방영경두，해경두결구간단、성본저。
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 .