The Design of Freeform Surface Fresnel Lens Used for LED Uniform Illumination

Abstract:

This paper presents a new kind of light emitting diode(LED) secondary light distribution lens which adopts the type of Fresnel lens surface. The research purpose of this paper is to improve the LED heat dissipation efficiency of the secondary light distribution lens and the light efficiency, so as to prolong the service life of the LED. In this paper, we use the numerical method for solving the partial differential equation to establish a freeform surface lens which could produce uniform illumination, then the innovative method of combine the Fresnel lens structure with freeform surface lens was proposed. The design of freeform surface Fresnel lens allows dramatically cut the thickness of the lens (as well as the weight and volume) , it can solve the problem of difficulty in heat dissipation. By comparing the ray tracing simulation results of original freeform surface lens and freeform surface Fresnel lens in optical simulation software, experiments show that the latter not only shows the same degree of illumination uniformity, but also greatly reduced the thickness of the lens.

• Periodical: Applied Mechanics and Materials (Volumes 571-572)
• Pages: 976-979
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.571-572.976
• Online since: June 2014
• Authors: Yi Dan Dai*, En Shi Qu, Li Yong Ren, Xin Chao Du, Hai Juan Ju
• Keywords: Freeform Surfaces, Fresnel Lens, Illumination Uniformity, Thermal Diffusivity

References

[1] Information on http: /www. lrc. rpi. edu/nlpip/publicationDetails. asp?id=885&type=2.

[2] Zhenrong Zheng , Xiang Hao , and Xu Liu: Applied Optics. Vol. 48(2009), No. 35.

[3] B. Yang and Y. T. Wang: Computer aided design of free form reflector. Proc. SPIE 5942, 88–96 (2004).

[4] R. Winston and H. Ries: Nonimaging reflectors as functionals of the desired irradiance. Proc. SPIE 2016, 2–11(1993).

DOI: 10.1117/12.161934

[5] W. Pohl, C. Anselm, C. Knoflach, A.L. Timinger, J.A. Muschaweck and H. Ries: Complex 3D-tailored facets for optimal lighting of facades and public places. Proc. SPIE 5186, 133–142(2003).

DOI: 10.1117/12.508383

[6] F. Zhao: Practical reflector design and calculation for general illumination. Proc. SPIE 5942, 59420J (2005).

[7] S. Kudaev and P. Schreiber: Optimization of symmetrical free-shape non-imaging concentrators for LED light source applications. Proc. SPIE 5942, 594209 (2005).

DOI: 10.1117/12.618795

[8] Jiang Jinbo , Sandy To and W. B. Lee: China Illuminating Engineering Journal. Vol. 19(2008), No. 4.

[9] Lin Li, Guangzhen Wang, Lili Wang, Jiangjun Ji and Yajun Zhang: Acta Optica Sinica. Vol. 32(2012), No. 2.

DOI: 10.3788/aos201232.0222002

[10] Xiaowu Guo: Acta Energiae Solaris Sinica. Vol. 12(1991), No. 4.

[11] Qingfei Qiao, Feng Lin: Journal of Applied Optics. Vol. 33(2012), No. 4.

[12] Rengmao Wu, Dawei Tu , Zhihua Huang, Qijie Zhao: Optical Technique. Vol. 35(2009), No. 1.