렌즈 최적설계에 있어 Merit Function 구성이 최적화 성능에 미치는 영향

초록

In the optimal design of an illumination LED lens with complex type, the influence of merit function on the lens performance was numerically analyzed, and the best merit function for satisfying an illuminance requirement was estimated. The lens was assumed to have freeform surfaces. Simulated annealing method was applied for the optimization, and merit function was composed of an ray arrival rate, a luminous flux efficiency, and an illuminance uniformity. From the analysis it was found that the composition ratio of the illuminance uniformity was the most sensitive to the performance of the optimized lens.