不需使用透鏡之LED準直出光照明模組

本文使用反射錐體和拋物反射面等來設計一個使用LED光源的照明模組，由於LED可藉由所提出的模組架構將光線平行射至前方，因此可以增加照明的距離。跟之前已經提出的內全反射透鏡(TIR len)或其他類似架構的模組相比較，此模組不需要使用透鏡即可達到全面並平行出光的效果，因此在製造上比較簡單，而且成本較低。此模組主要的結構由LED、反射錐體(由四個斜面所組成)、拋物反射面和傾斜反射面(平面)所組成，其中拋物反射面和傾斜反射面各可分為內側（靠近LED）和外側(靠近出光面)的部分。LED光源所發出的光可以分成兩個部分，其中較邊緣的LED光線經過內側傾斜反射面後透過內側拋物反射面而平行出光。而較中心的LED光線經過反射椎體(由四個斜面所組成)反射後又可分成兩種情形，即(1)較邊緣的LED光線經過反射椎體反射至外側拋物反射面後透過外側的傾斜反射面平行出光，和(2)較中心的LED光線經過反射椎體反射至外側拋物反射面後再反射至反射椎體的另一側而平行出光。最後我們也將提出的照明模組與內全反射透鏡和M394929車燈輔助照明結構的尺寸相比較，並以軟體模擬來作照度圖的分析比較。

關鍵字

LED準直器；拋物反射面； LED照明燈；完全內反射透鏡

並列摘要

In this thesis, one LED lighting lamp is proposed and it contains one pyramid and parabolic reflectors. Since light from the LED can be transmitted parallel to the optical axis by the proposed structure, the lighting distance can be increased. As compared to the total internal reflection(TIR) len and other similar lighting module proposed previously, parallelized light can be transmitted everywhere at the light exit without lens by the proposed module. Therefore, its manufacture process is simpler and the corresponding cost is lower as compared to that of previous ones. The proposed module consists of one LED, one pyramid-shaped reflector(composed of four plane reflectors), two parabolic reflectors (inner and outer) and two slanted plane reflectors(inner and outer). Light from the LED can be divided into two parts: light far from the optical axis (which is parallelized by successive reflections of the inner slanted plane reflector and the inner parabolic reflector) and light near the optical axis. After reflected from the pyramid-shaped reflector, light near the optical axis also can be divided into two parts: (1) outer light (which is parallelized by successive reflections of the pyramid-shaped reflector, the outer parabolic reflector and the outer slanted plane reflector), and (2) inner light (which is parallelized by successive reflections of the pyramid-shaped reflector, the outer parabolic reflector and the pyramid-shaped reflector once again.) Finally, the sizes and illumination diagrams for the proposed module, TIR lens and the car light structure(Taiwan patent no. : M394929) are compared.