Patent ID: 7778561
Filing Date: 2010-08-17
Classification: G03G

Abstract:
1. A charging device in which a discharge electrode and an inductive electrode are provided so as to sandwich a dielectric body and be opposed to each other and which charging device charges a charge receiving material by using ions that are extracted by applying an alternating voltage between the discharge electrode and the inductive electrode so as to cause creeping discharge, the charging device comprising: a period acquisition section acquiring operating period information of the charging device; and a voltage control section increasing, according to the operating period information of the charging device which operating period information is acquired by the period acquisition section, (i) a frequency of an applied voltage that is the alternating voltage applied between the discharge electrode and the inductive electrode, in accordance with an increase in the operating period of the charging device, and (ii) a maximum value of an absolute value of the applied voltage in a case where the frequency becomes equal to or more than a predetermined value.