Abstract:

A developing device is disclosed that is capable of preventing the hysteresis phenomenon, and which contains a toner and a carrier. The toner and the carrier are charged to different polarities by frictional contact thereof. The developing device has a first conveyance member and a second conveyance member which faces an electrostatic latent image bearing body via the second region. An electric field forming device forms a first electric field between the first conveyance member and the second conveyance member to move the toner in the developer retained by the first conveyance member to the second conveyance member, and forms a second electric field between the second conveyance member and the electrostatic latent image bearing body to move the toner retained by the second conveyance member to an electrostatic latent image of the electrostatic latent image bearing body.

Description:

RELATED APPLICATION

This application is based on Japanese Patent Application No. 2007-67223, the content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

The present invention relates to an electrophotographic image forming apparatus and a developing device used for the image forming apparatus

As a development method adopted for the electrophotographic image forming apparatus, a monocomponent development method using only a toner as a main component of developer, and a two-component development method using a toner and a carrier as main components of developer are known.

The developing device of the monocomponent development method has a toner bearing member which bears and conveys a toner and a friction charge member which comes into contact with the toner bearing face of the toner bearing member. Upon passing through a contact position with the friction charge member, the toner borne by the toner bearing member comes into frictional contact with the friction charge mem ...

Semiconductor device having wiring line and manufacturing method thereof