Patent ID: 9317005
Filing Date: 2016-04-19
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a developing unit that contains developer and that is detachable; a member including a first electrode, said member performing a rotation around a rotation shaft in the developing unit; a second electrode provided on an outer side of the developing unit, wherein said member bends by the rotation; an output unit that detects an electrostatic capacitance between the first electrode and the second electrode and that outputs data related to the detected electrostatic capacitance; and a determination unit that determines an amount of the developer in the developing unit based on the data output from the output unit, wherein the determination unit determines the amount of the developer in the developing unit based on an average value of the data during a time in which the data output from the output unit is equal to or more than a predetermined value.