Fast double free-form LED lens design for tiny rectangular light field with high efficiency
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We present a fast step-by-step method to design double free-form LED lens quickly; tiny rectangular light field with high efficiency can be achieved. Lens construction just need to derive two contour lines according to geometrical optics analysis. Lenses with different design angles are constructed according to the method, tiny rectangular light field from 2.3° × 1.2° to 6° × 10° can be achieved for a 1 mm × 1 mm LED source, optical simulation efficiency is higher than 83%, besides uniformity is higher than 79%. A manufactured lens proves the validity of the method.
KeywordsGeometric optical design Nonimaging optics Illumination design Light-emitting diodes
This work was supported by the Navy Scientific Research Foundation of China (no. 417210973).
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