论文信息 - Study on path-optimization by grade for sorting dies

Study on path-optimization by grade for sorting dies

Semiconductor light-emitting die (LED) has now become one of the most popular lighting devices. Before dies are put into process of package, they need be inspected and sorted strictly, so following waste will be saved. Cost of inspection and sort is relatively high, it is urgently needed to improve sort efficiency and reduce sort time. To get efficient solution, detailed view of working flow is presented to make analysis on performance and its influenced factors. It can be revealed that positioning of recycle bins is the major influence factor. Performance may decrease by 3.2 to 0.9 dies per second. Because of this, a path optimization method according grade priority is put forward. In this way, the dies with same grade should get priority to be sorted first. Techniques about die search and merge by grade, traversal of forward and backtrack with cross priority are described in detail. With results of reasonable simulations and a case experiment, this optimization is proved highly effective to reduce sort time and improve dies production rate.

[1] David G. Pelka,et al. An overview of LED applications for general illumination , 2003, SPIE Optics + Photonics.

[2] Hsin Rau,et al. Application of simulation to the scheduling problem for a LED sorting system , 2009, 2009 International Conference on Machine Learning and Cybernetics.

[3] Chia-Ju Wu,et al. Automatic measurement and grading of LED dies on wafer by machine vision , 2007, 2007 IEEE International Conference on Mechatronics.

[4] Zhu Xin. Task Planning and Implementation of Diode Chips Detection , 2006 .

[5] Ming Lu,et al. Proceedings of the Third International Conference on Machine Learning and Cybernetics , 2004 .

[6] P. H. Yap,et al. Design, simulation and experiment of electroosmotic microfluidic chip for cell sorting , 2007 .

[7] Jianping Li,et al. The Design and Realization of Machine Vision System in Flip - chip Bonder , 2006, 2006 7th International Conference on Electronic Packaging Technology.

[8] Yi-Cheng Huang,et al. Inspecting LED micro structure by piezo servo system , 2005, IEEE International Conference on Mechatronics, 2005. ICM '05..

[9] Rangachar Kasturi,et al. Machine vision , 1995 .

[10] Petra Schwille,et al. An integrated microfluidic system for reaction, high-sensitivity detection, and sorting of fluorescent cells and particles. , 2003, Analytical chemistry.