Multi-segment freeform LED uniform lens with low reflective loss

Liangping Xia; Shaoyun Yin; Xiaochun Dong; Chunlei Du

doi:10.1117/12.869487

5 November 2010 Multi-segment freeform LED uniform lens with low reflective loss

Liangping Xia, Shaoyun Yin, Xiaochun Dong, Chunlei Du

Proceedings Volume 7849, Optical Design and Testing IV; 784910 (2010) https://doi.org/10.1117/12.869487
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The secondary optical lens of the light-emitting diode (LED) constructed with freeform surface plays more and more important role in common illumination. The reflective loss at the freeform interfaces is discussed in this work. To restrict the reflective loss of the rays with the large incident angle, the freeform surface design rule is proposed. In this rule, the maximum deflexion angle of the refractive surface is 25° for a single freeform interface when choose PMMA to be the lens material, and the total reflection surface is introduced to control the rays which cannot be dealt by the refractive surfaces. The lens examples based on this rule are constructed by multi-segment freeform surfaces and the results show that the reflective loss is controlled less than 10%.

Citation Download Citation

Liangping Xia, Shaoyun Yin, Xiaochun Dong, and Chunlei Du "Multi-segment freeform LED uniform lens with low reflective loss", Proc. SPIE 7849, Optical Design and Testing IV, 784910 (5 November 2010); https://doi.org/10.1117/12.869487

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