High uniform illumination of light-emitting diodes lighting with applying the multiple-curvature lens |
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| Authors: | Allen Jong-Woei Whang Shih-Min Chao Cheng-Nan Chen Yi-Yung Chen Horng-Ching Hsiao Xi-Duo Hu |
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| Institution: | 1.Department of Electronic Engineering #43,National Taiwan University of Science and Technology,Taipei,Taiwan, R.O.C.;2.Graduate Institute of Electro-Optical Engineering #43,National Taiwan University of Science and Technology,Taipei,Taiwan, R.O.C.;3.Department of Electrical Engineering #43,National Taiwan University of Science and Technology,Taipei,Taiwan, R.O.C.;4.Department of Electronic Engineering #1,Dongguan University of Technology,Dongguan City,Songshan Lake, China |
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| Abstract: | Light-emitting-diode (LED) sources will play a very important role in the future. Nowadays, there are many traditional light
sources gradually being replaced by LED sources. From the viewpoint of illumination, different environments have the same
requirement uniformity of illumination. The basic reason for this is to insure human comfort. Therefore, the promotion of
illumination uniformity is an especially important key issue. In this article, we propose one effective design to improve
the uniformity of illumination of LEDs with Lambertian radiation profiles by inserting into the lighting system, multiple-curvature
lens. The enhanced illumination uniformity of LEDs, in this system, is due to energy redistribution by controlling the direction
of incident light, using geometrical optics theory. Ray tracing was applied for the simulations required. Finally, the uniformity
of illumination is 76.17% in LEDs using multiple-curvature lens, which is twice the uniformity of conventional LEDs. Furthermore,
the phenomenon of overload in the multiple-curvature lens is reduced by increasing the numbers of rings on the lens. The overload
is less than 0.02 lm in the case of lens designed with 23 rings. |
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