介電式液態透鏡之整合型LED照明系統

Integration of LED Illumination System with Dielectric Liquid Lens

陳羣文(Chun-Wen Chen)

指導教授 ： 葉哲良

國立清華大學/工學院/動力機械工程學系/碩士(2012年)

摘要

LED照明系統重要的兩大參數為其發光效率及其LED的散熱效率，前者與照明系統的效能有關，後者影響了照明系統的壽命。影響發光亮度的關鍵在於照明系統的外部封裝，外部封裝決定了整個系統光型與亮度。而影響散熱效率主要由散熱基板或外部散熱鰭片散熱效率來決定其散熱效率。
目前市面上的LED照明系統多為利用反光杯或是固定式鏡片來調整系統光型與亮度，此固定式反光杯與鏡片造成光型與亮度為固定，如因環境的改變需要調整亮度與光型，則需要重新設計反光杯或鏡片的形狀位置來調整光型。可調變式的LED照明系統將可有效解決每次需要重新設計反光杯或鏡片的問題。
本論文致力於開發LED結合介電式液態透鏡來作為新一代調變照明系統，此系統包含兩種特性其一為亮度光型可調性，其二為散熱特性，第一部份針對光學系統建立光學模組，並對此模組作光學模擬設計出其封裝殼將LED與介電式液態透鏡作結合結果可達到光型由邊緣光型變為聚焦光型，第二部分針對散熱系統作出熱學模組，針對此模組作熱學模擬與實驗，散熱效果在有無加入散熱液體溫度差可達20 ℃。針對此架設系統做光學與散熱實驗包含光通量、運作可靠度測試並對照模擬結果分析。

關鍵字

液態透鏡 ； 發光二極體 ； 調變照明

並列摘要

There are two important factors of LED illumination system. One is efficiency of light, and the other is efficiency of heat dissipation. The former decides the efficiency of LED illumination system. The latter decide the lifetime of system. The key of light output in the system is package. The package decides the light distribution .The heat dissipation is decided by the substrate or fin.
Reflect cups and shape of fix lens decide light distribution in the commercial market, but reflect cups and fix lens fix the light distribution. Light distribution has to change in different environment. The fix lens and cups have to redesign to tunable light distribution. Tunable LED illumination system can deal with this kind of problem.
LED combines with dielectric liquid lens to be a new generation illumination sys-tem in this thesis. The characteristic is tunable light distribution and good heat dissipation. First part is setup the optical system. According to simulation software design the package to connect the LED and liquid lens. The result of light distribution is changing form side emitting to focusing. The module of heat is setup by the simulation. The efficiency of heat dissipation can be 18 ℃ with package or not. The system has to measure the light flux and the reliability of system and compare to results of simulation and experiment.

並列關鍵字

Liquid lens ； LED ； Tunable illumination

參考文獻

11 鄭至成,”介電液體變焦透鏡” 國立清華大學 微機電所博士論文 (2006)

” Electrowetting-based variable-focus lens for miniature systems,” Opt. Rev. 12, 255-259 (2005)

3. C. C. Cheng, C. A. Chang, and J. A. Yeh, “Variable focus dielectric liquid droplet lens” Opt. Express, 14, 4101-4106 (2006)

4. 陳立舜, “液態透鏡光軸定心” 國立清華大學動力機械工程學系碩士論文,(2006)

5 C. G. Tsai, C. N. Chen, L. S. Cheng, C. C. Cheng, J. T. Yang, and J. A. Yeh “Planar liquid confinement for optical centering of dielectric liquid lenses,” IEEE Photo. Tech. Lett., 21, 1396-1398 (2009)