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Appl Opt. 2012 Dec 20;51(36):8557-62. doi: 10.1364/AO.51.008557.

Design of a compact modified total internal reflection lens for high angular color uniformity.

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  • 1Division of Micro-Opto-Electro-Mechanical Systems, Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.


Total internal reflection (TIR) lenses are optical components that are used to collimate the light or to generate a desired uniform illumination. However, most TIR designs do not pay attention to color uniformity, an increasingly important issue for the quality of lighting, and have a considerable dimension, which also limits their applications. In this study, we proposed an effective design principle of color mixing, and a phosphor-converted white LED module integrated with a compact modified free form TIR component was presented and optimized to achieve compact size and high angular color uniformity (ACU). Optimization results indicated that modified LED packages could achieve a smaller size in vertical height (~0.52) within the same horizontal radius, compared with LEDs integrated with classic TIR lenses. Meanwhile, the enhancement of ACU with an optimum appropriate divergence half angle (65°) reached as high as 84% in terms of normalized standard deviation of yellow-blue ratio from 0.888 to 0.429.

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