微型投影系统光路设计
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摘要
为了改善传统的数字光处理投影系统(DLP)体积较大、结构复杂、成本较高、对光源的利用效率较低的问题,采用一种基于单颗三色发光二极管作为照明光源,单颗透镜形成平行光的新型DLP投影光路结构的方法,对传统光路进行了改进与优化。无需传统光路中的色轮,透镜直接实现了传统投影光路中聚光和匀光的复杂结构,并利用TRACEPRO软件进行建模,通过光线追迹对该投影光路进行了光学分析。结果表明,整个光学系统的体积控制在76.8mm×32.2mm×25mm,光能利用率达到了60.1%,光斑均匀性达到了96.6%,屏幕表面的光通量为21.7lm。该研究减小了投影光路体积,简化了光学结构,提高了光能利用率。
In order to improve the problems of traditional digital light processing(DLP) projection system,such as,large volume,complex structure,high cost,and low utilization efficiency of light source,using single three-color light emitting diode as light source and using a novel DLP projection optical structure of forming parallel light by a single lens,the traditional optical path was improved and optimized. Without colorwheel in the traditional optical path,the complex structures of light gathering and light distribution in the traditional projection light path were realized by lens directly. After using TRACEPRO software to model,the projection light path was analyzed by ray tracing. The results show that,the volume of whole optical system is controlled at 76. 8 mm × 32. 2 mm × 25 mm,utilization rate of light energy reaches 60. 1%,spot uniformity reaches 96. 6%,and luminous flux on screen surface is 21. 7 lm. The research reduces the volume of projection light path,simplifies the optical structure and improves the utilization ratio of light energy.
In order to improve the problems of traditional digital light processing(DLP) projection system,such as,large volume,complex structure,high cost,and low utilization efficiency of light source,using single three-color light emitting diode as light source and using a novel DLP projection optical structure of forming parallel light by a single lens,the traditional optical path was improved and optimized. Without colorwheel in the traditional optical path,the complex structures of light gathering and light distribution in the traditional projection light path were realized by lens directly. After using TRACEPRO software to model,the projection light path was analyzed by ray tracing. The results show that,the volume of whole optical system is controlled at 76. 8 mm × 32. 2 mm × 25 mm,utilization rate of light energy reaches 60. 1%,spot uniformity reaches 96. 6%,and luminous flux on screen surface is 21. 7 lm. The research reduces the volume of projection light path,simplifies the optical structure and improves the utilization ratio of light energy.
引文
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[2]CHANG F,SUN Zh Y,WANG R G,et al.Improvement method of non-uniformity correction of LED display image[J].Optics and Precision Engineering,2011,19(4):929-937(in Chinese).
[3]LIANG H J,DENG J,WANG G,et al.Design and application of synchronous trigger light sources for high-speed photography[J].Laser Technology,2016,40(3):331-334(in Chinese).
[4]ZHOU Q Ch,BAI Z L,LU L,et al.Remote phosphor technology for white LED applications:advances and prospects[J].Chinese Optics,2015,8(3):313-328(in Chinese).
[5]FENG Q B,LI Y N,LI Q G,et al.Design of free-form surface lens based on light-emitting diode light distribution curve[J].Optics and Precision Engineering,2016,24(8):1884-1893(in Chinese).
[6]LIU Q,LIU Q N.Divergence characteristics of light spot of a circular LED array[J].Laser Technology,2015,39(6):858-862(in Chinese).
[7]WANG Ch,HAO W L,TIAN L W,et al.Design of miniature DLP projective optical path based on new type light guide tube[J].Infrared and Laser Engineering,2015,44(8):2472-2477(in Chinese).
[8]ZHAO X,FANG Zh L,CUI J Ch,et al.Research on micro-projector optical Engine[J].Acta Optical Sinica,2007,27(5):913-918(in Chinese).
[9]CHEN Ch,YU Y Q,HUANG Sh J,et al.3-D small-field imaging system[J].Infrared and Laser Engineering,2016,45(8):0824002(in Chinese).
[10]AN D,CHENG L,DING Y F,et al.Optical system model and calibration ofgrating projection phase method[J].Chinese Optics,2015,8(2):248-254(in Chinese).
[11]HOU Y.Design of lens to realize small angle lighting for LED[J].Infrared and Laser Engineering,2016,45(5):0518004(in Chinese).
[12]GNTHER A.Optical concept for an active headlamp with a DMD array[J].Proceedings of the SPIE,2008,7003:70032D.
[13]LI Zh,MOU D,LSh L,et al.Design of zoom LWIR projection system based on DMD[J].Infrared and Laser Engineering,2016,45(12):1218003(in Chinese).
[14]ZHEN Y,YE Z,YU F.Ultrahigh-performance lamp illumination system with compound parabolic retroreflector for a single liquid-crystal-on-silicon panel display[J].Optical Engineering,2007,46(5):054001.