The present paper describes a new method for calculating the tribo-charge distribution of a spherical toner particle. The forces which act on the particle adhered on the inner surface of the parallel electrodes connected to the power supply are the adhesion, the gravity and the Coulomb forces. By the movement of the toner particle under these conditions, the tribo-charge can be calculated by the following equation:
q=(8πσgd/3)/(V1-V2)
where V1 V2 d, σ, g and r are the voltage applied across the upper and the lower electrodes in the case that the toner particle put on the lower electrode is lifted toward the upper one, the voltage in the case that the toner particle gets back again to the lower one, the air gap distance between the two electrodes, the density of the toner particle, the acceleration of gravity and the radius of a toner particle, respectively. By using this method, the charge amounts of the toner particle can be easily obtained.
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