균일 LED조명을 위한 자유형상 2차 광학계 설계 및 공차 분석

초록

A freeform lens was optimally designed for achieving a uniform illumination and also its tolerance analysis was performed by considering alignment and fabrication errors. Divergent model was chosen for establishing the ray-arriving point relation for uniform illumination, and the differential equation for the lens shape was numerically solved. The illuminance distribution on the target area was calculated with LightToolsTM and the uniformity was extracted from the distribution. From the tolerance analysis, it was confirmed that the alignment error could give harmful effect on the performance.