The design and the analysis of a LED illumination lens using the overlapped model

Abstract

In this research, the overlapped illumination model was used for designing a freeform LED lens with a uniform illuminance distribution on its illuminating plane, and their performances and tolerances were compared. And, the illuminations on a illumination plane was measures for change with average illuminance and illuminance uniformity. As a result of the tolerance analysis about z-axis direction change, thickness change in lens and tilt change of light emission and characteristic change in LED source, overlapped model and divergent illumination model are similar to the performance about Z-axis direction change of light emission in LED source. but the uniformity illumination value in this overlapped model is more remarkably value than it in divergent illumination model about thickness change in LED lens. Also, even though the lens based on a divergent illumination model showed good performance compare to the lens based on an overlapped illumination model, the latter was less the deviation to variation of LED beam radiation ability. 키워드 : 중첩모델 , 자유 형상 렌즈, LED 렌즈, 균일조도, 반치각 Key word : Overlapped illumination model, Freeform Lens, LED lens, Uniform illuminance, half angle Received 07 July 2016, Revised 19 July 2016, Accepted 05 August 2016 * Corresponding Author Ilhyun You(E-mail:ihyou@semyung.ac.kr, Tel+82-43-649-1292) Department of Information Communication Technology, Semyung University, Jecheon, 27136, Korea Open Access http://doi.org/10.6109/jkiice.2017.21.1.157 print ISSN: 2234-4772 online ISSN: 2288-4165 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/li-censes/ by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Copyright C The Korea Institute of Information and Communication Engineering. Journal of the Korea Institute of Information and Communication Engineering 한국정보통신학회논문지(J. Korea Inst. Inf. Commun. Eng.) Vol. 21, No. 1 : 157~164 Jan. 2017