
Proceedings Paper
A free-form total internal reflection (TIR) lens for illuminationFormat | Member Price | Non-Member Price |
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Paper Abstract
Design of uniform illumination is one of the most crucial topics for LED to replace the traditional light sources. Based on
the theory of Etendue from non-imaging optics and the edge ray principle, in combination with the theory of freeform
surfaces, this paper sets up mathematical models of the refractive freeform surface lens and the total internal reflection
(TIR) freeform surface lens, which are solved by numerical method to obtain the shape of surfaces, simulates the optical
systems by 3D modeling and the ray-tracing software Trace-pro, and analyzes the lighting effects. The results show that
both of the lens can generate uniform illumination in the cone of 120° spatial angle. When the diameter of the emitting
surface of the LED is less than 2mm, the refractive freeform surface lens can generate uniformity above 0.8 and energy
efficiency above 0.83; when the diameter is less than 4mm, the TIR freeform surface lens can generate uniformity above
0.7 and energy efficiency up to 0.86.
Paper Details
Date Published: 15 November 2011
PDF: 9 pages
Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832110 (15 November 2011); doi: 10.1117/12.903939
Published in SPIE Proceedings Vol. 8321:
Seventh International Symposium on Precision Engineering Measurements and Instrumentation
Kuang-Chao Fan; Man Song; Rong-Sheng Lu, Editor(s)
PDF: 9 pages
Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832110 (15 November 2011); doi: 10.1117/12.903939
Show Author Affiliations
Guiying Yu, China Jiliang Univ. (China)
Shushu Ding, China Jiliang Univ. (China)
Shushu Ding, China Jiliang Univ. (China)
Ji Jin, China Jiliang Univ. (China)
Tiantai Guo, China Jiliang Univ. (China)
Tiantai Guo, China Jiliang Univ. (China)
Published in SPIE Proceedings Vol. 8321:
Seventh International Symposium on Precision Engineering Measurements and Instrumentation
Kuang-Chao Fan; Man Song; Rong-Sheng Lu, Editor(s)
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