簡易LED均光透鏡設計之光學模擬及驗證

Design of an Optical Lens for Uniform LED Illumination with Simulation and Experiment Verification

凌慶榮(Ching-Rong Ling)

指導教授 ： 林穀欽

崑山科技大學/工程學院/機械工程研究所/碩士(2012年)

https://doi.org/10.6828/KSU.2012.00071

摘要

本文探討簡易LED均光透鏡設計及光學模擬驗證，本設計法可應用於辦公室天花板燈及廣告燈箱，其需求良好光均勻性之呈現及照明。本研究使用SolidWorks 3D軟體繪製透鏡，另使用TracePro分析軟體進行光學模擬，再藉由模擬結果及基礎光學觀念以完成設計本透鏡，並達良好之均光產出。
本研究已完成一具天花板燈製作，本燈具尺寸大小為600x600x120 mm3，共使用4顆多晶LED燈，每顆LED耗電10瓦，其尺寸大小為ψ39mm。本研究共設計兩款透鏡，其目標平面300x300 mm2照明範圍內，須呈均光照度分佈，因須配合光源尺寸，本透鏡底部尺寸均設計為50x50mm2，其中，第一款透鏡之整體外形呈金字塔形，其頂部具球體內凹，第二款之整體外形呈倒金字塔形，其頂部具拋物體內凹。兩款透鏡經光軌跡模擬比較結果顯示，前者光投射範圍為265x265mm2，後者光投射範圍為285x285 mm2，後者較前者得呈現較佳光照度均勻性。本研究僅針對第一款透鏡做實作，實驗驗證結果顯示，其光投射範圍與模擬者吻合，其照度分佈呈良好之目測均勻性。

關鍵字

光學透鏡 ； 均光照明 ； LED

並列摘要

This study explores an intuitive and simple design methodology for an optical lens for LED uniform illumination and the associated simulation and experimental verification. The methodology can be applied to design a lens of uniform illumination for office lighting and lighting boxes of advertisement where good uniformity of illumination may be demanded. This study uses the SolidWorks software for the 3D plotting and designing of the lenses. The lens data in a file format are then read into the TracePro software for ray-tracing and optical simulation. The simulation results are feedback for modification of the lens re-design until a satisfactory design and good uniformity of illumination are achieved.
This study has completed design and fabrication of a ceiling lighting device. The device has a dimension of 600x600x120 mm3. It uses 4 LED units, each of which has multiple chips and power consumption of 10 watt. An LED unit has a size of ψ39mm. Two lenses are designed in this study. The illumination target is designed of 300x300 mm2 rectangular area on a plane. To comply with the size of the LED units, the lens bottoms are fixed to be 50x50 mm2 in the design. One of the designed lenses has a pyramid shape with concave spherical surface on the top of the pyramid, while the other has an upside-down pyramid shape with concave parabolic surface on the top.
Simulations for the above designed lenses have been conducted. The results show that the lenses redirect the LED light rays onto an area of 265x265 mm2 and 285x285 mm2, respectively. The latter generates a better uniformity than the former. Fabrication of the lens of a pyramid shape with concave spherical surface and the associated experimental verification are included in this study. Good matching on the illumination areas between simulation and experiment is achieved. The illumination under the fabricated lens exhibits good uniformity by the naked-eye observation.

並列關鍵字

Optical lens ； Uniform illumination ； LED

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