Patent ID: 9213264
Filing Date: 2015-12-15
Classification: G03G

Abstract:
1. An image forming device that comprises: a developing device which includes a developing unit storing a developer containing a first carrier and a toner and a toner concentration detection unit detecting a toner concentration within the developing unit; a supply container which stores a supply developer containing a second carrier whose bulk density is different from a bulk density of the first carrier and the toner, to which a recording member recording a property of the second carrier is attached and which is removable with respect to a device main body, and that supplies, when a detection value detected by the toner concentration detection unit is lower than a setting value of the toner concentration detection unit, the supply developer from the supply container to the developing unit to increase the amount of the developer in the developing unit, and when the increase causes an excessive amount of the developer within the developing unit, the excessive amount is discharged from the developing unit, the image forming device further comprising: a first storage unit which stores a storage amount of the first carrier stored in the developing unit before feeding of the second carrier and a property of the first carrier; a reading unit which reads the property of the second carrier from the recording member; a second storage unit which stores the property of the second carrier read by the reading unit and a supply amount of the second carrier supplied from the supply container to the developing unit; and a calculation unit which calculates a presence proportion of the second carrier within the developing unit from the storage amount of the first carrier stored in the developing unit before feeding of the second carrier and the supply amount of the second carrier supplied from the supply container to the developing unit, wherein the setting value of the toner concentration detection unit is corrected based on the presence proportion of the second carrier detected by the calculation unit.