Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Optimal Design of Secondary Optics for Narrowing the Beam Angle of an LED Lamp with a Large-Area COB-type LED Package

대면적 COB-type LED 패키지를 포함한 LED 램프의 좁은 광속각 구현을 위한 2차 광학계 최적 설계

  • 김봉준 (인하대학교 정보통신공학과, 광전자 연구실) ;
  • 김대찬 (인하대학교 정보통신공학과, 광전자 연구실) ;
  • 오범환 (인하대학교 정보통신공학과, 광전자 연구실) ;
  • 박세근 (인하대학교 정보통신공학과, 광전자 연구실) ;
  • 김봉호 (LG전자 소재부품연구소) ;
  • 이승걸 (인하대학교 정보통신공학과, 광전자 연구실)
  • Received : 2013.11.05
  • Accepted : 2014.02.11
  • Published : 2014.04.25
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Abstract

In this paper secondary optics for an LED lamp with a narrow beam angle of $15^{\circ}$ were optimized by using a two-reflector system, to reduce both its size and the occurrence of satellite rings. The conic constant and the curvature of the primary reflector were determined by considering the relation of the source size to the beam angle, and the optimal position and radius of the secondary reflector were found for reducing the occurrence of satellite rings. Luminous flux efficiency was about 80%.

본 논문에서는 직경이 14.5 mm인 대면적 COB-type LED 패키지를 사용하면서도 15도 이내의 좁은 광속각을 구현하기 위해, 광학계 크기를 축소하고 동시에 satellite ring 발생을 억제할 수 있는 이중 반사경 구조를 고안하여 조명광학계용 2차 광학계를 최적 설계하였다. 최적 설계를 위해 광원 크기와 제 1 반사경의 광속각 관계를 이용하였고, satellite ring 발생을 억제하기 위한 제 2 반사경의 최적 위치 및 크기를 고려하였다. 그 결과 대체 상용 제품의 크기 제한을 만족하며 80%의 광속 효율을 달성할 수 있었다.

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Cited by

  1. Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination vol.20, pp.5, 2016, https://doi.org/10.3807/JOSK.2016.20.5.614