ELECTRIFICATION BIAS VOLTAGE CONTROL PROCESS, ELECTRIFICATION BIAS POWER SOURCE CIRCUIT, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To improve function of voltage selection in a peak-to-peak AC voltage selective control; in an image forming apparatus having a power source circuit 1 applying AC/DC superposed voltage by one set of voltage boosting means per three sets of charging means in contact with a rotatable latent image carrier 2, and a detecting means 28 for detecting AC in the latent image carrier on applying voltage; in the power supply circuit 1 outputting oscillating power outputting stepwise more than two kinds of peak-to-peak AC voltage, with the detecting current over peak-to-peak selective control AC threshold value by the detecting means on applying voltage, and using the voltage on detecting minimum current value as a charged bias voltage on forming images.;SOLUTION: Alternating current oscillation output is part of initial rotation during power source charge of the apparatus, and voltage between a plurality of alternating current peaks is changed by stage and oscillated. Electrification alternating current flowing in a latent image carrier is detected, the value is voltage selection threshold between the electrification alternating peaks or more, and bias voltage detecting the minimum current value is determined to electrification bias alternating current voltage during image formation.;COPYRIGHT: (C)2004,JPO&NCIPI