Design of uniform illumination projector with high power LED
-
摘要: 以特定区域的均匀照明为目标，设计一种以单粒LED为光源的均匀投射系统。根据LED的发光特性以及能量守恒定律选择采用折射全反射(TIR)光学系统，通过建立TIR折射面及全反射面轮廓曲线上的点所满足的常微分方程，利用RungeKutta求解常微分方程得到轮廓曲线上点的坐标，再在UG中对坐标点进行曲线拟合得到轮廓曲线，进而得到TIR模型及适合数控加工的面形数据。将TIR模型导入Tracepro并对投射系统追迹光线。模拟结果表明：目标平面的光照均匀度达到92.6%，系统的效率达到91.8%。Abstract: A uniform projection system with a single LED as light source was designed for the purpose of the uniform illumination in a designated region. An optical system with refraction and total internal reflection (TIR) was proposed according to the luminous characteristic of LED and the law of energy conservation. The ordinary differential equations satisfying the spots on the contour curve of TIR refractive and reflective planes were established. The coordinates of points on profile curves were obtained by solving these ordinary differential equations using Runge-Kutta method. The profile curves were acquired by curve fitting of the coordinate spots with software UG, and then TIR model of the projector and data of the surface shape suitable for NC manufacture were obtained. The TIR model of the projector was introduced into Tracepro, and rays were traced. The results show that the illumination uniformity of the illuminated region is better than 92.6%, and the efficiency of the whole system is more than 91.8%.
-
Keywords:
- applied optics /
- high-power LED /
- projector /
- LED illumination /
- illuminance
-
-
［1］屠大维, 吴仍茂, 杨恒亮, 等. LED封装光学结构对光强分布的影响［J］. 光学·精密工程,2008,16(5):832-838.
TU Da-wei, WU Reng-mao, YANG Heng-liang, et al. Effect of optical structure on output light intensity distribution in LED package［J］. Optics and Precision Engineering, 2008,16(5):832-838.（in Chinese with an English abstract)
［2］贺卫利, 郭伟玲, 高伟, 等. 大功率发光二极管可靠性和寿命评价实验方法［J］. 应用光学,2008,29(4):533-536.
HE Wei-li, GUO Wei-ling, GAO Wei, et al. Test method of life-time and reliability evaluation for high-power LED［J］. Journal of Applied Optics,2008,29(4): 533-536.（in Chinese with an English abstract)
［3］Philips Lumileds reports 115 lm/W power LED at 350mA［EB/OL］.［2007-01-23］.http://www.ledsmagazine.com/news/4/1/23.
［4］SCHWARTE R, HEINOL H, XU Z, et al. A new active 3D-vision system based on rf-modulation interferometry of incoherent light［J］. SPIE,1995,2588:126-134.
［5］EICHHORN K. LEDs in automotive lighting［J］.SPIE,2006,6134:1-6.
［6］BORTZ J, SHATZ N, PITOU D. Optimal design of nonimaging projection lens for use with an LED source and a rectangular target［J］.SPIE,2000,4092:130-138.
［7］孙英杰,卜文斌. LED照明的照度均匀性研究［J］. 哈尔滨师范大学学报：自然科学版, 2008,24(3):49-52.
SUN Ying-jie, BU Wen-bin. The study of illumination uniformity for LED［J］. Natural Sciences Journal of Harbin Normal University, 2008,24(3):49-52.（in Chinese with an English abstract)
［8］鲍友南,潘奕凯,姚柏宏,等.TV用液晶显示器之背光模组技术［J］.机械工业杂志, 2003,245:158-169.
BAO You-nan, PAN Yi-kai, YAO Bai-hong, et al.Back light module technology of LCD for TV［J］. Journal of the Mechatronic Industry, 2003,245:158169.（in Chinese with an English abstract)
计量
- 文章访问数: 4527
- HTML全文浏览量: 149
- PDF下载量: 1498
下载:
陕公网安备 61011302001501号 