Tiantian Hu, Chunmei Zeng, Congshan Rui, Yang Hong, Suodong Ma. Optical design of freeform Fresnel TIR lens for LED uniform illumination[J]. Infrared and Laser Engineering, 2021, 50(2): 20200183
- Infrared and Laser Engineering
- Vol. 50, Issue 2, 20200183 (2021)
Fig. 1. Flow chart for designing the freeform TIR lens
Fig. 2. Equalize the luminous flux and the target plane (
: the cone angle of the sampling rays; R : the radius of the target plane;
: the radius of each annulus on target plane)
Fig. 3. Schematic diagram of the freeform TIR lens (1: a circular plane; 2: a freeform surface to be designed; 3: a cylindrical surface inside; 4: a freeform TIR surface to be designed; 5: an annular plane)
Fig. 4. Optical geometry of freeform surface
Fig. 5. Schematic diagram of Fresnel lens (R : the half-diameter of the lens; d : the width of each annulus;
: the half inside-diameter of the j th Fresnel annulus;
the half outer-diameter of the j th Fresnel annulus)
Fig. 6. 2D cross-section diagram of two types of TIR lens
Fig. 7. Illuminance distribution of two types of TIR lens
Fig. 8. 3D models of two types of TIR lens
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Table 1. Main parameters of Fresnel lens
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Table 2. Illumination effect of freeform Fresnel TIR lenses with different numbers of segments
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Table 3. Comparison of lens size and illumination performance
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