| Summary: | 碩士 === 國立中央大學 === 光機電工程研究所 === 103 === This thesis mainly studies on a high efficiency and highly collimated LED lamp with inside and outside axisymmetric reflectors and a design technique use to powerfully close a given design solution to achieve the set aims for the collimated LED lamp. The inside and outside axisymmetric reflectors of the lamp are designed by the plane geometry relationship which based on a line light source and a symmetry divergence angle, the obtained normalized objective functions, and the analytic hierarchy process. For the set aims, the analytic hierarchy process is used to set the weighting value of needed evaluating factors.
A sample is used to verify the design technique. The target specifications are taken: the position of target area is 20 m behind the LED chip; the full width at half maximum (FWHM) of divergence angle is less than 7°; the uniformity of main target area (a radius 873mm) is over 85%; the efficiencies of main target area and auxiliary target area (a radius 2279mm) are as high as possible. The geometric size of lamp are taken: the diameter of lamp is 310mm, the height is 222.15mm. When the position of target area is 20 m behind the LED chip, the results show that the full width at half maximum of divergence angle is 6.5°, the uniformity of main target area is 85.99%, flux efficiency is 27.96% , and the flux efficiency of auxiliary target area is 66.68%.Obviously, the design technique can auxiliary design a high efficiency and highly collimated LED lamp with inside and outside axisymmetric reflectors.
Keywords: high power LED lamp, highly collimated LED lamp, reflect lampshade type, dual-reflect lampshade type
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