Discharging and dust removing method and discharging and dust removing apparatus

摘要

The invention provides a discharging method by which charges can be removed readily, uniformly and efficiently from a surface of a working object even where the surface has a complicated charge pattern of a large number of small positive and negative charged portions present closely to each other at random in a mixed condition. A working object is passed between a positive and negative ion producing discharging electrode and an ion attracting electrode opposed to the positive and negative ion producing discharging electrode and having a face extending in a travelling direction of the working object and a perpendicular direction. During such passage, high positive and negative voltages are applied alternately to the positive and negative ion producing discharging electrode to alternately produce positive and negative ions. Simultaneously, a high ac voltage is applied to the ion attracting electrode to induce positive and negative potentials in the working object so as to attract the positive and negative ions produced by the positive and negative ion producing discharging electrode by the induced potentials of the working object.