21 August 2009 An optical switch of natural light guiding system based on cubic structure with fresnel surface
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Abstract
Recently, many researches focus on illumination with sunlight for saving energy and healthy lighting. A Natural Light Guiding System has collecting, transmitting, and lighting parts. In most systems, the paths on transmitting part are fixed so the collected sunlight of the Natural Light Guiding System can not be free managed and is sometime wasted. In this paper, we design an optical switch to change the path of the collected sunlight on the transmitting sunlight. The switch is cubic structure that includes a 45 degree mirror for reflecting sunlight. According to the structure of the optical switch, we can rotate the switch to manage the path of the collected sunlight. When the path is parallel with the mirror, the sunlight will pass through the switch; and when the included angle between the path and mirror is 45 degree, we can change the path of light. For coupling the exit beam into lightpipe, we design the surfaces of cubic structure to be aspheric surface with Fresnel surface. Finally, we simulate the efficiency of the optical switch when the path is changed by the mirror.
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Kao-Hsu Chou, Yi-Yung Chen, Allen Jong-Woei Whang, "An optical switch of natural light guiding system based on cubic structure with fresnel surface", Proc. SPIE 7428, Current Developments in Lens Design and Optical Engineering X, 74280O (21 August 2009); doi: 10.1117/12.825266; https://doi.org/10.1117/12.825266
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