Patent ID: 8229309
Filing Date: 2012-07-24
Classification: G03G

Abstract:
1. An image forming device comprising: an image holding member provided with a photoreceptor at a surface thereof, the image holding member holding an electrostatic image that is formed at the surface by light being illuminated in accordance with image information in a charged state; a charging unit that charges the surface of the image holding member by applying a voltage in which a DC voltage and an AC voltage are superimposed; a current detection unit that, in one of a case in which an AC current, while being increased, is supplied to the charging unit in a state in which the DC voltage value and AC voltage value applied to the charging unit are maintained, or a case in which a DC voltage, while being increased, is supplied to the charging unit in a state in which the AC voltage value applied to the charging unit is maintained, detects DC current values that flow to the image holding member in association with supply amount increases; an inflection point derivation unit that derives an inflection point of a correlation line representing a correlation between the DC current values that are detected by the current detection unit and the supply amounts that are supplied to the image holding member at times of detection of these DC current values; an execution unit that executes pre-specified processing when a characteristic value of the inflection point derived by the inflection point derivation unit reaches a pre-specified value; a holding unit that holds supply amount data representing the supply amount when the characteristic value of the inflection point derived by the inflection point derivation unit reaches the pre-specified value; and an update unit that updates the supply amount data held by the holding unit when the characteristic value of the inflection point derived by the inflection point derivation unit reaches the pre-specified value in a state in which the supply amount data is held by the holding unit.