| 摘要: | 由於發光二極體(Light-Emitting Diode, LED)的效率大幅提升，以及省電、耐用、環保等優點，已經漸漸取代傳統的一般照明，如省電燈泡。但是LED使用在照明上還是有其他的缺點，以高功率LED來說，雖然發光強度高，但由於LED是小區域出光，有輝度過高，直視時會有眼睛不舒服的問題，也較容易有眩光，故一般常用透鏡或反射燈罩來組成燈具以避免上述問題，然而，此類燈具常有光能不夠集中在照明區域或照明區域的照度值不夠均勻的設計問題。 在本研究中，考慮以3顆高亮度LED為光源的桌燈作為研究載具，探討如何搭配使用二次光學透鏡來實現高效率、高均勻的照明需求。同時，我們也探討在可射出成型的聚碳酸酯（PC）塑料中加入具有散熱功效的氮化硼的對塑料散熱功效的影響。 在光學性能部分，我們使用光學模擬軟體搭配機構設計分析軟體等工具，設計搭配多種不同圓對稱光形及非對稱光形之的二次光學透鏡。我們考慮在離燈具400 mm的800×600 mm照明目標區域，取最佳照度值及照度均勻度，模擬結果顯示以90°×60°非對稱光形二次光學透鏡設計值為最佳，與未加二次光學透鏡比較，其平均照度值從304.0 lux 提高至514.1 lux，照度均勻度也從58.36% 提高至78.21%。而與樣品做實際照度量測比較，平均照度值由304.0 lux提升到389.3 lux，照度均勻度也由55.71%升到81.16%。明顯可知非對稱型光分佈的發光二極體照明裝置可效提升非對稱型照明目標區域的照明裝置的能量使用效率及照度均勻性。 在散熱材料部分，我們將氮化硼/PC混掺測試板與單純PC測試板搭配LED模組做溫度測試，其溫度由60.6℃下降至53.7℃，結果顯示氮化硼確實可提昇塑料的散熱功效，若控制得當，未來有機會適可快速成型複雜形狀之散熱器件。 White LED is getting popular in the market due to its enhanced optical efficiency which highlighted features like energy-efficiency, environmental friendliness, long lifetime, and low maintenance, it has been booming by gradually replaced traditional light bulb. However, LED has higher luminous intensity comparing with traditional light bulb, LED has some shortcomings. for example, higher luminance and glare caused eye discomfort, in order to improve higher luminance and glare, it requests second optics such as reflector and lens. Nevertheless, the non-uniformity of illumination and focus still need to be improved. In this study, present three pieces of high power LED module as light sources for desk lamp as a research model. Investigation on the use of second optical lens to enhance the efficiency and uniformity of lighting needs. Simultaneously, in the workable of injection molding process plastics(polycarbonate), added a hBN powder for cooling capacity study. Part of the optical performance, we utilizing simulated (optics simulation software) and second optical lens fallow by reading condition: the height to desk 400 mm and illumination area 600×400 mm, to design lenses achieve the parameter in both of uniformity and sufficient intensity. The optics simulation software shows, 90 ° × 60 ° of non-symmetric lens have sufficient intensity and light uniformity. Compared with the non-optical lens, average light intensity from 304.0 lux increased to 514.1 lux, light uniformity increased from 58.36% to 78.21%. Compared with the lens prototype, average light intensity from 304.0 lux increased to 389.3 lux, light uniformity increased from 55.71% to 81.16%. Clearly indicated the non-symmetric lens used in LED can effectively improve intensity and light uniformity. Finally, hBN and PC materials have been successfully fabricated a hBN /PC composite. In the thermal performance testing, compared to pure PC material, the temperature drop from the 60.6 ℃ to 53.7 ℃.This thermal conductivity hBN /PC composite can be used on injection molding process for complex shapes and thermal module. |
