균일한 휘도를 갖는 선형 타입 LED 조명용 비대칭 광지향각 렌즈에 관한 연구

Abstract

In this paper, we studied the asymmetric wide angle lens suitable for linear type LED lamp which has uniform luminance and appropriate light distribution. Light distribution of the lens for X-axis is designed such that the maximum light intensity peak angle is ±70°, light intensity at the center of the lens is 15% of the maximum light intensity, and light distribution of the lens for Y-axis is about 160°. According to the lens design, the asymmetric wide angle lens were manufactured by injection molding method. As a result, it was confirmed that the lens can satisfy not only the uniform luminance but also the proper light distribution compared with design targets on light distribution and uniform luminance. The efficiency of optical output for manufactured lens was 93.5%. The optical characteristics of tubular LED lamp using lens were measured to be equal or better, and the light distribution was found to be wider than what of coventional products. The luminance uniformity was 74.3% for 28EA LEDs and 80.4% for 32EA LEDs.