Charging bias voltage control method, the charging bias power supply circuit, and an image forming apparatus

摘要

PROBLEM TO BE SOLVED: To attain compatibility between a satisfactory electrifying control and the cost and space saving of a power source circuit, in an electrification method for outputting alternating voltage and direct current superposed bias voltage to an electrifying means 11 by using a single voltage booster T1.;SOLUTION: An electrification bias power source circuit 21 has not less than two types of alternating current oscillation outputs 22, and an alternating current detecting means 27 for detecting alternating current which flows into a latent image carrier 10. A plurality of alternating voltage is sequentially applied at non-image formation. At that time, then, the alternating voltage at which a current value detected by the alternating current detecting means 27 is greater than necessary minimum current and is the smallest value is used as electrification bias alternating voltage at image formation.;COPYRIGHT: (C)2004,JPO