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Aspheric surface lens for LED collimating illumination with low Fresnel loss

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Abstract

An aspheric surface lens is presented to realize collimating illumination with low Fresnel loss based on Fresnel equations and Snell’s law. The smooth 2D contour of refractive optical surface is constructed from a set of cubic Bézier segments, whose control points are computed by deCasteljau algorithm. Simulation results show that the optical efficiency of 90.82% is achieved under a divergence angle of ±2.87° for an extended light-emitting diode (LED) source with chip size of 1 mm × 1 mm and the Fresnel loss is only 8.76%, whose optical efficiency has improved 14.3% than traditional collimating lens. By employing this proposed surface construction method, the largest divergence angle of collimating lens for point source is only 0.26° with 15 feature points on each refractive surface, while more than 2° for the traditional method. Therefore, the beams are well controlled with fewer feature data points. Tolerance analyses are also conducted in detail.

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Acknowledgements

This work was supported by Special Project on the Integration of Industry, Education and Research of Guangdong Province (No. 2013A090100018), Guangdong High-level Personnel of Special Support Program (Outstanding young scholar in science and technology innovation) (No. 2014TQ01X212), Guangdong Innovative Research Team Program (No. 2014ZT05G157) and the 2014 annual provincial construction project (quality project) (No. SJJD006).

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Authors and Affiliations

  1. Guangdong Provincial Key Laboratory of Micro-nano Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou, 510643, China

    Xindu Chen, Jiaping Lin, Zhanji Liu, Peixuan Wu & Han Wang

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  1. Xindu Chen
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  2. Jiaping Lin
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  3. Zhanji Liu
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  4. Peixuan Wu
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  5. Han Wang
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Correspondence to Peixuan Wu or Han Wang.

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Chen, X., Lin, J., Liu, Z. et al. Aspheric surface lens for LED collimating illumination with low Fresnel loss. Opt Rev 24, 62–71 (2017). https://doi.org/10.1007/s10043-016-0296-5

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  • DOI: https://doi.org/10.1007/s10043-016-0296-5

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