Corona discharge air ionizers are widely used during the assembly of electronic products to reduce the electrostatic attraction (ESA) and the electrostatic discharge (ESD), that can attach particulate contaminants to printed circuit boards and destroy electronic parts. It is necessary to use the operating conditions of ionizer with caution, because a conventional air ionizer always generates ions. However, operating conditions and theoretical neutralizing of an air ionizer are based on

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... e for development, because there is not report for the theoretical static neutralization processes. In this study, we investigate static electricity countermeasure for printed circuit board, assessing the relationship between the neutralization current and the neutralization speed. It became clear that it was necessary to examine condition both a mixture of positive and negative static charged model.