Fig. 1. Composition structure of TIR collimating lens

Fig. 2. Schematic of algorithm design of transmission part

Fig. 3. Schematic of algorithm design of reflection part

Fig. 4. Schematic of derivation relation of algorithm iteration

Fig. 5. Discrete point fitting curves of different parts. (a) Refraction part; (b) reflection part

Fig. 6. TIR collimating lens. (a) Schematic of two-dimensional cross-section; (b) three-dimensional diagram

Fig. 7. Ray tracing results

Fig. 8. Effect of light spot on receiving board

Fig. 9. Distribution curve flux

Fig. 10. Full color view of spot

Fig. 11. Light spot before and after amendment normal vector. (a) Before amendment; (b) after amendment

Fig. 12. Irradiance after amendment normal vector

Fig. 13. Light distribution curve after amendment normal vector

Fig. 14. Full color image after amendment normal vector

Fig. 15. Initial structure of traditional TIR collimating lens

Fig. 16. Ray tracing results of traditional TIR collimating lens

Fig. 17. Light distribution curves of different lenses. (a) TIR collimating lens after optimization; (b) traditional TIR collimating lenses