npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2020; 70: 90-96

Published online January 31, 2020 https://doi.org/10.3938/NPSM.70.90

Copyright © New Physics: Sae Mulli.

Grating Design of a Hybrid Fresnel Lens for Collimating Nonaxial Double Light Source Systems

Seong-Won CHOI1*, Young-Mun YOO1, Jong-Tae KIM2

1Department of LED Engineering Cooperation Course, Pukyong University, Busan 48513, Korea

2Department of Converged display engineering, Pukyong University, Busan 48513, Korea

Correspondence to:tjddnjs085@naver.com

Received: September 4, 2019; Revised: October 4, 2019; Accepted: October 14, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fresnel lenses are lenses that have been reduced in size and volume by removing internal volumes that contribute less to the refracting power. Recently, various types of hybrid Fresnel lenses have been proposed for various purposes. In this study, a grating design method for the first surface of a hybrid Fresnel lens optical system was proposed based on the main parameter of a single Fresnel lens optical system for the purpose of miniaturization of the collimating optical system. The grating consists of a mixture of refractive gratings and internal reflection gratings, and the two gratings can compensate for the shortcomings of each other. Double light sources were placed on the nonaxis point of the object focal plane, and the sensitivity of each grating was analyzed for variations in the radiation distribution and the target radiation width according to the distance between the light sources.

Keywords: Fresnel lens, Collimating, Grating, Hybrid lens

프레넬 렌즈는 굴절능에 기여가 적은 내부 부피를 제거해 크기 및 부피를 줄인 렌즈로서 근래에는 각 목적에 따라 다양한 형태의 하이브리드 프레넬 렌즈가 제안되고 있다. 본 연구에서는 시준 광학계의 소형화를 목적으로 단일 프레넬 렌즈 광학계의 주요 파라메타에 기초하여 하이브리드 프레넬 렌즈 광학계 중 제 1면의 격자 설계법을 제안하였다. 격자는 굴절형 격자와 내부전반사형 격자의 혼합으로 이루어져있으며 두 격자는 서로의 단점을 보완해줄 수 있어 광축을 기준으로 중심부에는 굴절형, 외각에는 내부전반사형 격자가 자리한다. 물측 초점면의 비축 상에 광원이 다중 배치되었으며 광원 간 이격거리에 따른 굴절광의 방사 분포 변화와 목표 방사폭에 대해 각 격자의 기울기별 민감도를 분석하였다.

Keywords: 프레넬 렌즈, 콜리메이팅, 격자, 하이브리드 렌즈

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