Special Optics Element Design in Enhancing Illumination Effects

設計一特殊光學元件於增加照明效果

葉家宏(Chia-Hung Yeh) ； 曾仕杰(Shih-Chieh Tseng) ； 施景瑞(Ching-Jui Shih) ； 張復瑜(Fuh-Yu Chang) ； 楊宏智(Hong-Tsu Young)

《中國機械工程學刊》 35卷3期 (2014/06) Pp. 251-256

摘要

本研究提出使用線性菲斯涅爾透鏡（Linear Fresnel Lens）取代傳統同心圓菲斯涅爾透鏡，以有效改善傳統同心圓菲斯涅爾透鏡將光線過度集中及無法均勻分布於工作區域問題。本研究主要目的是將辦公室光線有效聚焦在長300㎜寬300㎜的桌面閱讀範圍內。利用光學軟體TracePro針對此設計光學元件進行模擬與效率分析，模擬結果發現此光學元件會隨著不同曲率半徑設計而造成光路分佈情形與光學效率有所差異。模擬結果得知曲率半徑最佳參數值為R=480mm，另外貼附此光學元件之光學效率將提升2.5倍。將依模擬結果所設計之光學元件經機械加工製作成成品，於實際環境下經光學量測證實與模擬結果相吻合。

並列摘要

The special optics element based on a linear Fresnel lens is applied to replace those with the traditional Fresnel lens formed with concentric circles. Such specially designed diffractive optical element (DOE) is aimed to improve the problem of the traditional Fresnel lens, which causes the lights to centralize in various spot sizes, instead of evenly spreading over the working area. An ideal office environment requires the light to be shined evenly in a 300 mm by 300 mm reading desk. The ray-tracing software tool, TracePro, is used to simulate optical paths, and the efficiency analysis is also carried out. It is found that the radius of curvature of the diffractive optical element is a key factor in determining the ray distribution. The test results show that the optimum parameter for the radius of curvature is R=480mm, corresponding to optical efficiency enhanced by 2.5 times with the proposed diffractive optical element in comparison with the traditional Fresnel lens. The experiments are made for a basis of the above conditions for the prototyped diffractive optical element, where the optical efficiency is theoretically and experimentally verified.

並列關鍵字

Optics Element ； Nano-imprint ； Illumination ； Energy Conservation