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Proceedings Paper

Miniature the size of integrated sphere by three-lens design to measure the total light flux of wafer-level LED
Author(s): Luan-Ying Chen; Kao-Der Chung; Chen-Chin Cheng
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Paper Abstract

The opening of the integrating sphere (IS) is limited by the port ratio, roughly 4% of the sphere surface area. Therefore, there exist a tradeoff between enlarging the opening to collect more radiance flux from the LED, and maintaining the port ratio when the sphere is miniaturized. A lenses group can be designed to narrow the spot size of LED in order to minimum the volume of IS. By adopting the simulating method systematically, the spot can be narrowed from 1.5mm to 0.283mm. The corresponding volume of IS can be reduced to more 50% in size. It is possible to achieve the multichannel measurement on the wafer-level. The novel IS combined with the designed lenses group may be useful to raise the speed of the measurement of LED in the future.

Paper Details

Date Published: 23 September 2015
PDF: 7 pages
Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 962639 (23 September 2015); doi: 10.1117/12.2191416
Show Author Affiliations
Luan-Ying Chen, Industrial Technology Research Institute (Taiwan)
Kao-Der Chung, Industrial Technology Research Institute (Taiwan)
Chen-Chin Cheng, Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 9626:
Optical Systems Design 2015: Optical Design and Engineering VI
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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