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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71578


    Title: 準直鏡、對稱式聚光鏡與非對稱式聚光鏡均光系統在數位微型反射鏡元件上之效率比較與分析
    Authors: 趙昱豪;Chao,Yu-Hao
    Contributors: 光電科學與工程學系
    Keywords: 投影機;準直鏡;聚光鏡
    Date: 2016-08-18
    Issue Date: 2016-10-13 13:18:19 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 準直鏡的均光系統架構,由三顆RGB LED、三顆準直鏡、兩片色彩分光鏡、透鏡陣列、延續透鏡與DMD所組成。當光源經由一顆或三顆LED發光,經過準直鏡出射後為準直,會經過兩片色彩分光鏡後會讓三種不同LED光源入射在透鏡陣列入光面上,再由透鏡陣列出光面出射至延續透鏡後投射在DMD上。而準直鏡均光系統光展量計算,效率為65.54%。設鏡面表面穿透率為100%,模擬R LED光源入射至DMD效率為49.71%、平均差為4.29%;G LED效率為41.10%、平均差為4.71%;B LED效率52.72%、平均差為4.41%。
    對稱式聚光鏡均光系統,以對稱式聚光鏡取代準直鏡外,其他光學元件與準直鏡均光系統相同之另一種設計,可使LED的光源聚焦在透鏡陣列入光面上。而對稱式聚光鏡均光系統光展量計算,效率為50.81%。模擬R LED光源入射至DMD效率為47.16%、平均差為1.54%;G LED效率為39.95%、平均差為2.98%;B LED效率47.68%、平均差為2.25%。
    由於對稱式聚光鏡在像方光展量比透鏡陣列入光面光展量小,造成光量損失26.09%,我們提出非對稱式聚光鏡均光系統,使非對稱式聚光鏡在像方光展量與透鏡陣列入光面光展量相同,使光展量效率提高為68.74%。R LED光源入射至DMD效率為63.52%、平均差為2.97%;G LED效率為53.38%、平均差為2.98%;B LED效率56.24%、平均差為3.43%。
    ;The uniformity system of collimator is composed of three LED, three collimator lens, two dichroic filter, a lens array, a relay lens and DMD. When LEDs light sources are through collimator lens, the rays can be as parallel rays. Three LED light sources are incident on entrance surface of lens array after the parallel rays are through two dichroic mirrors. And then use of a relay lens made the rays projected on DMD from exit surface of lens array. The uniformity system of collimator is calculated Étendue which the efficiency is 65.54%. When transmittance of mirror surface is 100%, the efficiency of red LED is 49.71% on DMD and the average deviation is 4.29%. The efficiency of green LED is 41.10% on DMD and the average deviation is 4.71%. The efficiency of blue LED is 52.72% on DMD and the average deviation is 4.41%.
    The uniformity system of condenser is that the condenser lens is replaced collimator lens. The optical elements of symmetric condenser system and the optical elements of collimator system are the same. The uniformity system of symmetric condenser is calculated Étendue which the efficiency is 50.81%. When transmittance of mirror surface is 100%, the efficiency of red LED is 47.16% on DMD and the average deviation is 1.54%. The efficiency of green LED is 39.95% on DMD and the average deviation is 2.98%. The efficiency of blue LED is 47.68% on DMD and the average deviation is 2.25%.
    Because the image plane of the symmetric condenser is less Étendue than the entrance surface of lens array, the efficiency of Étendue is loss 26.09%. We propose the uniformity system of asymmetric condenser.Therefore, the image plane of asymmetric condenser and the entrance surface of lens array are the same Étendue. The uniformity system of asymmetric condenser is calculated Étendue which the efficiency is 68.74%. When transmittance of mirror surface is 100%, the efficiency of red LED is 63.52% on DMD and the average deviation is 2.97%. The efficiency of green LED is 53.38% on DMD and the average deviation is 2.98%. The efficiency of blue LED is 56.24% on DMD and the average deviation is 3.43%.
    Appears in Collections:[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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