プリント基板スルーホールボイド検査装置

概要

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This paper describes a system which automatically inspects defects in plated through-holes formed in muti-layer printed circuit boards. These defects are the type of which a part of copper is lacking on the wall of the plated through-hole. In order to detect the defects, the system utilizes fluorescent light emission from the base materials of the boards. The through-holes are illuminated with a green light. The system detects defects by sensing the fluorescent light with an ultra-high sensitivity detector. If there are any defects, i. e., if there, is any part of base material exposed, the materials emit red fluorescent light. It has been proved that the system can detect circular voids as small asφ150 μm, or voids with a surface area bigger than φ150 μm.
社団法人精密工学会の論文
1990-05-05