Patent ID: 7831159
Filing Date: 2010-11-09
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member on which an electrostatic image is capable of being formed; a charging apparatus configured to charge the image bearing member in a charging section; a developing apparatus containing developer which includes toner and carrier, the developing apparatus being configured to develop, in a developing section, an electrostatic image formed on the image bearing member; a transfer apparatus configured to transfer a toner image formed on the image bearing member to a transfer medium in a transfer section; a charging auxiliary apparatus including a charging auxiliary member contacting with the image bearing member at a position downstream of the transfer section and upstream of the charging section in a moving direction of the image bearing member, and a voltage applying device configured to apply a voltage to the charging auxiliary member, the charging auxiliary apparatus being able to change a charge amount of the toner on the image bearing member; a current detecting device configured to detect a current flowing in the charging auxiliary member during a period of non-image formation when the voltage is applied to the charging auxiliary member; a toner density detecting device configured to detect information regarding a toner density of the developer in the developing apparatus; and a toner supply control device configured to control supply of the toner to the developing apparatus based on a detection result of the current detecting device and a detection result of the toner density detecting device.