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。
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.
参考文献
| [1] | 赵星,吴宏超,宋丽培,方志良.微型投影机自由曲面LED聚光器的设计[J].光学精密工程,2010(10):2123-2129. |
| [2] | 马建设,张波常,苏萍,等.应用微柱透镜的自由立体前投影屏幕设计[J].液晶与显示,2013,27(6):760-763. Ma J S,Zhang B C,Su P,et al.Autostereoscopic front projection system based on micro-lenticular lens array[J]. Chinese J ournal of Liquid Crystals and Displays,2013,27(6):760-763.(in Chinese),2013. |
| [3] | 康玉思,田志辉,刘伟奇,等.激光显示广角球幕投影镜头设计[J].液晶与显示,2013,28(3):330-337. Kang Y S,Tian Z H,Liu W Q,et al.Wide-angle dome-screen projection lens design of laser display[J].Chinese J ournal of Liquid Crystals and Displays,2014,29(3):333-336.(in Chinese),2013. |
| [4] | Yang J M,Liu W Q,Lv W@ Z,et al.Method of achieving a wide field-of-view head-mounted display with small distortion[J].Opt.Lett.2013,38(12):2035-2037,2013. |
| [5] | 卢海平,刘伟奇,康玉思,魏忠伦,冯睿,付瀚毅.超大视场头盔显示光学系统设计[J].光学精密工程,2012(05):979-987. |
| [6] | Kuwata M,Sasagawa T,Kojima K,et al.Wide angle projection optics for compact rear projector [J].SID ’05 Digest,70(3):1918-1921.,1918. |
| [7] | Gohman J A.Wide-angle projection lens[P].U.S.Patent 7175287 _2007.,2007. |
| [8] | Ogawa J,Agata K,Sakamoto M,et al.Super-short foeus front projectior with aspheric mirror projection optical system [J].SID’05 Digest,13(2):111-116. |
| [9] | 孙旭涛 .应用自由曲面的超薄投影显示系统理论和实验研究[D].浙江大学,2008. |
| [10] | Shikama S,Suzuki H.Optical system of ultra-thin rear projector equipped with refractive-reflective projection op-tics [J].SID 02 Digest 46.(2)1250-1253. |
| [11] | 康玉思,田志辉,刘伟奇,冯睿,王玉龙.超薄前投激光显示系统研制[J].应用光学,2012(05):832-836. |
| [12] | 李丹,薛芸芸,曹雯,姚连芳,石会双,郭海成,张宝龙.基于微透镜阵列的DMD芯片投影系统照明优化[J].光学学报,2013(01):187-190. |
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