Patent ID: 9727001
Date: 2017-08-08
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image forming device including: a latent image bearer; a charging rotator to charge a surface of the latent image bearer while rotating; a charging power supply to output a voltage to be applied to the charging rotator; a latent image writing unit to write a latent image on the surface of the charged latent image bearer; and a developing unit to develop the latent image to obtain a toner image; an electric current detector to detect a current flowing between the charging rotator to which the voltage output from the charging power supply is applied and the latent image bearer; and a controller to (i) determine an uneven electric resistance of the charging rotator in a direction of rotation of the charging rotator, based on a detection result by the electric current detector, (ii) perform, at a predetermined timing, data construction processing to construct change pattern data to change an output value of the voltage from the charging power supply according to a predetermined pattern, based on the uneven electric resistance, and (iii) perform, in a print job to form a toner image in response to an instruction, voltage changing processing to charge the latent image bearer while changing the output value of the voltage from the charging power supply, based on the change pattern data; wherein the controller is configured to, in the data construction processing, determine the uneven electric resistance, based on a detection result of a change over time of the current detected by the electric current detector while applying a constant voltage to the charging rotator in rotation.