Image forming apparatus and method of manufacturing the same.

摘要

In an image forming apparatus of the present invention, the adhesion amounts of developing agent on a high-density test pattern and a low-density test pattern are measured by a toner density measuring unit (8). On the basis of the measured adhesion amounts of developing agent on the high-density region and low-density region and the target values of the adhesion amounts, the deviations of the adhesion amounts of the high-density region and low-density region are calculated. The renewal amount of contrast voltage and the renewal amount of background voltage corresponding to the high-density region deviation and low-density region deviation are inferred by an inference unit (65) on the basis of inference data stored in a memory unit (61). The grid bias value and development bias value corresponding to the inferred renewal amounts of contrast voltage and background voltage are calculated. The grid bias voltage and development bias voltage are varied in accordance with the calculated grid bias value and development bias value.