Patent ID: 7577371
Filing Date: 2009-08-18
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: an image bearing member; a developing device including a developing unit for storing a developer containing toner and magnetic carrier, said developing device developing an electrostatic image formed on said image bearing member by using the toner; a toner replenisher for replenishing a toner in said developing device; a first controller for controlling a replenishing operation of said toner replenisher, based on concentration information relating to toner concentration in the developing unit; and a second controller for controlling a correction operation for an image forming condition based on concentration information relating to a concentration control patch formed on said image bearing member, wherein said second controller does not execute the correction operation for the image forming condition, based on the concentration information relating to toner concentration in the developing unit, regardless of the concentration information relating to the concentration control patch, or limits a correction amount for the image forming condition in the correction operation, based on the concentration information relating to the toner concentration in the developing unit.