Patent ID: 7242876

Claim:
An image forming apparatus comprising: image forming means for forming a toner image on an image bearing member by using a developer, said image forming means having a developing unit containing the developer; a density sensor configured to detect a density of a detection toner image formed by said image forming means; and control means for controlling an amount of the developer to be supplied from a sealed developer supply container to said developing unit in accordance with data obtained from an output of said density sensor and a target value, wherein said control means comprises: means for detecting information relating to an ambient environment where said image forming apparatus is placed when developer is first supplied from the sealed supply container to said developing unit; means for forming the detection toner image by said image forming means on the basis of an image forming condition that is changed in accordance with the information relating to the ambient environment detected when developer is first supplied from the sealed supply container to said developing unit; means for obtaining data by said density sensor detecting the detection toner image formed on the basis of the image forming condition that is changed in accordance with the information relating to the ambient environment detected when developer is first supplied from the sealed supply container to said developing unit; and means for substituting a value obtained by correcting the data obtained from the output of said density sensor by using an amount of change according to the detected information relating to the ambient environment for the target value to produce an initial density setting.