National Changhua University of Education Institutional Repository : Item 987654321/10919
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 6507/11669
Visitors : 29729610      Online Users : 498
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/10919

Title: Free-form lens design for LED indoor illumination
Authors: Huang, Kuang-Lung;Chen, Jin-Jia;Wang, Te-Yuan;Huang, Li-Lin
Contributors: 電機工程學系
Keywords: LED;Free-form;Uniformity
Date: 2010-10
Issue Date: 2012-06-04T09:14:57Z
Publisher: SPIE
Abstract: This paper presents a free-form lens design for indoor illumination. The lens consists of a TIR (total internal reflection) surface on the sidewall, a refractive surface on the front side, and a concave surface on the rear side. The TIR surface is decorated with a free-form profile that light rays emitted from the LED with a larger spread angle to the axis will experience a total internal refection and output from the front refractive surface.
While the central part of the front refractive surface has a convex surface that makes light rays closing to the optical axis more evenly distributed. The purpose of the rear concave surface is to let light rays emitted from the LED enter the lens straightforwardly. With this lens light rays from a Lambertian-type LED light source can be redistributed so that a uniform illumination can be achieved. The optical simulation results show that the
measured optical efficiency is 75% while the uniformity is 80% on a target plane of 6-m diameter and at 2.5-m away.
Relation: SPIE/COS Photonics Asia, Beijing, China, Oct. 18-20, 2010: 7852
Appears in Collections:[Department and Graduate Institute of Electronic Engineering] Proceedings

Files in This Item:

File SizeFormat
2050200116016.pdf31KbAdobe PDF574View/Open


All items in NCUEIR are protected by copyright, with all rights reserved.

 


DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback