| Summary: | 碩士 === 國立交通大學 === 工業工程與管理系 === 90 === SMT machine in PCB assembly is moving up rapidly during the past decades. While many defects, such as component missing, wrong component, misalignment, wrong polarity, solder bridge, excess solder, insufficient solder etc., still hide in the working process.
This paper is to design and develop an SMD-based PCB auto-inspection system by using the machine vision technology. The in-line PCB production problem is considered. The mainly focused inspection items of SMD components are resister missing / wrong component, solder bridge of the lead of SOP or QFP, and excess solder / insufficient solder of solder joints of QFP.
A new programmable-controlled lighting environment composed of multi-layer of ring-type LED array is also designed, which can provide appropriate light for grabbing the desired PCB image. A prototype of the PCB auto-inspection machine is implemented which shows high robustness and effectiveness of the proposed machine vision method.
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