超广角数字通用型投影镜头设计
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摘要
为了解决现有超广角数字投影镜头存在的缺陷和不足,并与不同类型和规格数字投影机的超广角投影匹配,给出了8组9片式超广角数字通用型投影镜头的光学系统设计.镜头焦距为8.76mm、全视场角达到97°、F数为2.12、后工作距离大于34mm、最大口径小于96mm、总长小于200mm,结构中加入了1个偶次非球面,较好地校正了轴外像差与畸变.用减少透镜数量和增大相对孔径的办法提高了像面照度;通过增大光阑慧差及减小像方半视场角,提高了像面相对照度,其值达97.46%以上.通过合理确定棱镜等效厚度及调整结构布局,使结构适配光学引擎中棱镜的有效光学厚度为16.5~23mm.设计的镜头分辨率达120lp/mm、全视场相对畸变绝对值小于1.5%.结果表明:该镜头可满足0.55in~0.76in 3LCD和1DLP类型的各种数字投影机的使用,最小投射比可达0.53∶1,投影画面偏移量最大达到389mm,结构简单,体形小,成本低,成像质量好,可批量化生产.
To solve defects and deficiencies of the existing ultra wide-angle digital projection lens and match the ultra wide-angle projecting from different types and specs of digital projectors,a type of ultra wide-angle digital universal projection lens composed of nine lenses was designed.The focal length is8.76 mm,the full field of view reaches 97°,F-number is 2.12,BFL is longer than 34 mm,the largest diameter is less than 96 mm and the total optical length is shorter than 200 mm.By setting an effective even aspheric,the off-axial aberrations and distortion are corrected well.By reducing the number of lens and increasing the relative aperture,illumination is improved.By increasing the aperture coma of the system and reducing the FOV of image,relative illumination is improved up to 97.46%.By determining the prim thickness and adjusting the structure and layout,the lens can match prisms of different effective optical thicknesses from 16.5mm~23mm in several kinds of digital projector engines.The resolution is120lp/mm,and the absolute value of relative distortion is less than 1.5%.The design indicates that the lens can match digital projectors by using 3LCD and 1DLP technologies with the chip sizes from 0.55 in to 0.76 in,minimum projection ratio is up to 0.53∶1and the largest frame offset reaches 389 mm.Its image quality is excellent with advantages of simple structure,small size,low cost and mass produced.
To solve defects and deficiencies of the existing ultra wide-angle digital projection lens and match the ultra wide-angle projecting from different types and specs of digital projectors,a type of ultra wide-angle digital universal projection lens composed of nine lenses was designed.The focal length is8.76 mm,the full field of view reaches 97°,F-number is 2.12,BFL is longer than 34 mm,the largest diameter is less than 96 mm and the total optical length is shorter than 200 mm.By setting an effective even aspheric,the off-axial aberrations and distortion are corrected well.By reducing the number of lens and increasing the relative aperture,illumination is improved.By increasing the aperture coma of the system and reducing the FOV of image,relative illumination is improved up to 97.46%.By determining the prim thickness and adjusting the structure and layout,the lens can match prisms of different effective optical thicknesses from 16.5mm~23mm in several kinds of digital projector engines.The resolution is120lp/mm,and the absolute value of relative distortion is less than 1.5%.The design indicates that the lens can match digital projectors by using 3LCD and 1DLP technologies with the chip sizes from 0.55 in to 0.76 in,minimum projection ratio is up to 0.53∶1and the largest frame offset reaches 389 mm.Its image quality is excellent with advantages of simple structure,small size,low cost and mass produced.
引文
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[13]XIE Feng,HAO Qun,ZHU Qiu-dong.Best-fit aspheric surface definition based on slope asphericity for aspheric surface[J].Acta Optica Sinica,2010,30(11):3197-3202.谢枫,郝群,朱秋东.基于斜率非球面度的非球面最接近比较球面定义[J].光学学报,2010,30(11):3197-3202.
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[15]ZHONG Xing,ZHANG Yuan,JIN Guang.Illumination uniformity optimization of wide-viewing-field optical system[J].Acta Optica Sinica,2012,32(3):0322004钟兴,张元,金光.大视场光学系统像面照度均匀性优化[J].光学学报,2012,32(3):0322004.
[2]刘旭,李海峰.现代投影显示技术[M].浙江:浙江大学出版社,2009:213-390.
[3]李林.现代光学设计方法[M].北京:北京理工大学出版社,2009:188-198.
[4]SONG Jia-jun,HE Ping-an.Design of zoom projection lens for the light engine of LCOS rear-projection[J].Journal of Applied Optics,2007,28(1):58-62.宋家军,何平安.LCOS背投光学引擎中变焦投影物镜设计[J].应用光学,2007,28(1):58-62.
[5]CHEN Chen,LI Wei-shan,ZHANG Yu,et al.Optical design of short focal digital projection lens[J].Acta Photonica Sinica,2011,40(14):1855-1859.陈琛,李维善,张禹,等.短焦数字投影镜头的光学设计[J].光子学报,2011,40(12):1855-1859.
[6]CHEN CH,LIU Xiao-chan,LI Wei-shan,et al.Design of light weight small wide-angle projection lens[J].Acta Photonica Sinica,2011,40(8):1266-1269.陈琛,刘宵婵,李维善,等.轻小型广角投影物镜的设计[J].光子学报,2011,40(8):1266-1269.
[7]LI Wei-shan,CHEN Chen,ZHANG Yu,et al.Optical design of digital movie zoom projection lens[J].Acta Photonica Sinica,2012,41(10):1186-1192.李维善,陈琛,张禹,等.短焦数字电影变焦放映镜头的设计[J].光子学报,2012,41(10):1186-1192.
[8]YONEYAMA K.Wide-angle projection lens and projectiontype image display device:US,6542316[P].2003-04-01.
[9]KIM J.Wide-angle projection lens:US,6999247[P].2006-02-14.
[10]NAGAHARA A,YAMAMOTO C.Projection lens and projection display device using the same.US,7280285[P].2007-08-10.
[11]WANG Yi,NI Ying,YU Jing-chi.Computer controlled polishing technology for small aspheric lens[J].Optics and Precision Engineering,2007,15(10):1527-1533.王毅,倪颖,余景池.小型非球面数控抛光技术的研究[J].光学精密工程,2007,15(10):1527-1533.
[12]XUE Dong-lin,ZHANG Zhong-yu,ZHANG Xue-jun.Computer controlled polishing technology for middle or small aspheric lens[J].Optics and Precision Engineering,2005,13(2):198-204.薛栋林,张忠玉,张学军.一种中小口径非球面数控抛光技术[J].光学精密工程,2005,13(2):198-204.
[13]XIE Feng,HAO Qun,ZHU Qiu-dong.Best-fit aspheric surface definition based on slope asphericity for aspheric surface[J].Acta Optica Sinica,2010,30(11):3197-3202.谢枫,郝群,朱秋东.基于斜率非球面度的非球面最接近比较球面定义[J].光学学报,2010,30(11):3197-3202.
[14]LIU Hui-lan,SHA Ding-guo,HAO Qun,et al.A method for calculating asphericity of high-order optical aspheric surface[J].Opto-Electronic Engineering,2004,31(6):44-47.刘惠兰,沙定国,郝群,等.一种高次光学非球面度的计算方法[J].光电工程,2004,31(6):44-47.
[15]ZHONG Xing,ZHANG Yuan,JIN Guang.Illumination uniformity optimization of wide-viewing-field optical system[J].Acta Optica Sinica,2012,32(3):0322004钟兴,张元,金光.大视场光学系统像面照度均匀性优化[J].光学学报,2012,32(3):0322004.