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A corona type ionizer is a device that supplies air flow including positive and negative corona ions for the elimination of electrostatic charges on a charged target. DC ionizers placed close to the charged target are proposed to shorten the charge elimination time and decrease the remaining voltage. The ionizer is composed of a grounded mesh electrode and opposed positive and negative needle electrodes. The opposed φ-type electrodes are also tested to improve the performance. A strong electric field can be formed between the grounded mesh and the charged target; therefore, the ion drag force due to the electric field become dominant and plays an important role in charge elimination with this technique. A charge elimination model using a simplified charge elimination current is also proposed to evaluate the performance of the ionizers. The charge elimination performance of the ionizer using opposed φ-type electrodes was much better than that using opposed needle electrodes, due to the increase in the positive and negative charge density, which increases elimination of the target charge.
Date of Conference: 7-11 Oct. 2012