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Freeform surface lens for LED uniform illumination.
Zheng Zhenrong1, Hao Xiang, Liu Xu
1State Key Laboratory of Modern Optical Instrumentations, Zhejiang University,Hangzhou, 310027, China. zzr@zju.edu.cn
Applied Optics
|December 17, 2009
Summary
This study introduces a novel freeform surface lens design for uniform LED illumination. The developed method achieves a 6-degree divergence half-angle and 78.6% efficiency, optimizing light distribution.
Area of Science:
- Optics and Photonics
- Optical Engineering
- Illumination Systems
Background:
- Designing secondary optics for Light Emitting Diodes (LEDs) is crucial for achieving desired light distribution.
- Traditional lens designs often struggle to meet stringent uniformity and efficiency requirements.
- Freeform optics offer greater design flexibility compared to conventional refractive or reflective elements.
Purpose of the Study:
- To propose and validate a novel method for designing freeform surface lenses for LED secondary optics.
- To achieve highly uniform illumination with a narrow divergence angle using a freeform lens.
- To demonstrate the practical fabrication and performance of the designed LED lens.
Main Methods:
- Utilizing Snell's Law to derive differential equations relating surface normals to ray vectors.
- Employing Runge-Kutta formulas for solving differential equations to design the freeform surface.
- Simulating the optical model for uniform illumination and analyzing performance metrics.
- Fabricating the freeform lens using injection molding.
Main Results:
- The designed freeform lens achieved uniform LED illumination.
- The system demonstrated a narrow divergence half-angle of 6 degrees.
- An optical efficiency of 78.6% was recorded for the fabricated lens.
Conclusions:
- The proposed freeform surface lens design method is effective for LED secondary optics.
- Injection molding is a viable technique for fabricating complex freeform lenses for illumination.
- The developed system provides a practical solution for high-efficiency, uniform LED lighting.
