Design of a compact LED illuminator with narrow beam diffusion angle

• Main Authors: Liao, Hom-Wei, 廖竑瑋
• Other Authors: Cherm, Jyh-Long
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/05420620638320150578

碩士 === 國立交通大學 === 光電工程學系 === 100 === 　　　The subject of this thesis is the design and discussion of narrow beam angle and high-efficiency illuminator. Illuminator is composed of the light source and the lighting which including the optical lens and devices. General light source is such as incandescent light, light emitting diode, and laser diodes. According to the applications of different light sources and the different requirements of light field types, the corresponding optical lenses are different. In this paper, we use a single LED to design a high illuminator efficiency and narrow beam angle illuminator in both symmetric and asymmetric structure. LightTools and Code V are the optical software used by us during design to establish the light sources, the optical lenses, the receiver which do ray-tracing simulation for observing the efficiency and the focus of the spot. After the original design is completed, we examine the tolerance analysis for understanding the effect in efficiency between the LED positions and the angle errors, and also trying to find out how fresnel-like to impact the divergent angle. Under the asymmetric structure, we had designed a lens which the efficiency is 43.05%and the beam angle is 15.6 degree, on the other hand, the symmetric structure one which the efficiency is 78.32% and the beam angle is 5.8 degree.