Abstract
We proposed a method for the design of a freeform lens for light emitting diode (LED) light source based on intensity distribution curve. The energy mapping rules are considered in this design. The freeform lens achieves the optical requirements of the element and the geometrical requirements of the surface continuity. The method simplifies the design process of the freedom surface to avoid the repetitive optimization design and increase the design efficiency. In this paper, the modeling and optical simulation of freeform lenses for LED light source with 45°and 30°intensity distribution curves are performed. The simulation results prove the accuracy of the proposed method.
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