CAJ | 학술논문

为了缩短超短焦距投影仪的机械总长,克服传统离轴超短焦距投影系统的装调困难,降低系统的设计难度,设计了一种同轴的超短焦距投影系统。首先,通过分析像差与系统总长的关系,证明了需要保证系统总长的必要性。然后,通过镂空非球面反射镜中心部分,利用平面或球面反射镜折转光路,提出了一种新的设计超短焦距投影仪的方法。在保证光学总长的同时缩短了机械总长,提高了空间利用率,解决了同轴折反系统中存在挡光的问题。最后设计的系统总长为215 mm,投射尺寸为100 in。系统的投射比为0．17,物方 NA 为0．2,焦距为1．66 mm。各个视场传递函数在内奎斯特频率处达到0．5以上,各指标都满足了投影系统的要求。同时,在透镜个数相同的情况下,系统的性能都优于传统的投影仪。
위료축단초단초거투영의적궤계총장,극복전통리축초단초거투영계통적장조곤난,강저계통적설계난도,설계료일충동축적초단초거투영계통。수선,통과분석상차여계통총장적관계,증명료수요보증계통총장적필요성。연후,통과루공비구면반사경중심부분,이용평면혹구면반사경절전광로,제출료일충신적설계초단초거투영의적방법。재보증광학총장적동시축단료궤계총장,제고료공간이용솔,해결료동축절반계통중존재당광적문제。최후설계적계통총장위215 mm,투사척촌위100 in。계통적투사비위0．17,물방 NA 위0．2,초거위1．66 mm。각개시장전체함수재내규사특빈솔처체도0．5이상,각지표도만족료투영계통적요구。동시,재투경개수상동적정황하,계통적성능도우우전통적투영의。
A new type of coaxial ultra short focal projector was designed in order to reduce the align-ment difficulty,reduce the difficulty of system design and shorten the total length.Firstly,by analy-zing the relationship between the system’s total length and the aberration,the necessity of ensuring a long system’s total length is proved.Then,through hollowing the central portion of an aspherical mirror and using a plane or spherical mirror to deflecting the optical path,a new design method for ul-tra short focal length projector is presented.It solves the blocking problem existing in the coaxial cat-adioptric optical system and improves the space utilization rate by ensuring a long total optical length and shortening the overall machinery length.Finally,the system’s screen size is 100 in and the total length of 215 mm.The focal length is 1.66 mm and the object NA is 0.2 with 0.17 throw ratio.The MTFs of every field are over 0.5 at the Nyquist Frequency.All of the indexes meet the demand of the projective system.Meanwhile,in the case of the same number of lenses,the system’s performance is better than the conventional projector.