Patent attributes
An image forming apparatus includes a photoconductor, an electrifying member, a high voltage applying unit for applying to the electrifying member a high voltage in which a DC component of a constant voltage on an AC component of a constant current are superposed, a DC current measuring unit for measuring a DC current value flowing from the electrifying member to the photoconductor when the photoconductor is electrified, and a controller for integrating the DC current value measured by the DC current measuring unit for an application time of the DC component to the photoconductor, calculating an electrostatic charge quantity of a DC current flowing into an electrostatic capacitance unit constituting the AC generator and subtracting the electrostatic charge quantity from the integration result to calculate the electrified charge quantity corresponding to the film thickness of the photoconductive thin film.
