Patent ID: 8433210

Claim:
An image forming apparatus for performing image formation by using an electrophotographic process, comprising: a detection section for detecting a temperature and humidity in the own apparatus; and a control section for judging existence of necessity of correction of process conditions in the electrophotographic process based on environment dependence characteristic information of a resistance value of a member that is used for the electrophotographic process and constitutes the image forming apparatus and environment change information in the own apparatus, and for performing correction based on a result of the judgment, wherein the control section uses ratios of temperatures and pieces of humidity at which the resistance values of the member become comparable levels, the member having been left as it is a sufficiently long time, as the environment dependence characteristic information, and calculates a ratio between an absolute value of a difference of the temperatures detected by the detection section at a first time and a second time and an absolute value of a difference between the pieces of humidity detected by the detection section at the first time and the second time as the environment change information.