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Proceedings Paper

Optical inspection method of lead frame using mathematical morphology
Author(s): Daecheol Lim; Seung-Yong Yun; Boo-Yong Jung; CheolKee Hong
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Paper Abstract

Lead Frame is a core part of semiconductor IC and is used as a conductor to transmit electrical signal. In this study, an inspection system was developed that has utilized linear cameras and a method has been proposed for an automated inspection of LF. Mathematical morphology has been employed for the inspection. A modified thinning algorithm was proposed and has been used to make a master pattern of LF. The proposed method follows three steps to evaluate the quality of product. It is the first step to place the master on an object image precisely. Those have abnormal gray values in the object, are extracted as defective candidates. The last work is to evaluate the candidates according to a heuristic rule of decision. The proposed method has shown a good efficiency for the inspection of LF> It has been possible to find defect in a fast way and given minimal misjudgement. The proposed method is also efficient in inspecting etched products e.g. PCB and tape μBGA.

Paper Details

Date Published: 4 October 2001
PDF: 8 pages
Proc. SPIE 4564, Optomechatronic Systems II, (4 October 2001); doi: 10.1117/12.444079
Show Author Affiliations
Daecheol Lim, LG Electronics, Inc. (South Korea)
Seung-Yong Yun, LG Electronics, Inc. (South Korea)
Boo-Yong Jung, LG Electronics, Inc. (South Korea)
CheolKee Hong, LG Electronics, Inc. (South Korea)

Published in SPIE Proceedings Vol. 4564:
Optomechatronic Systems II
Hyungsuck Cho, Editor(s)

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