Patent ID: 8280268
Filing Date: 2012-10-02
Classification: G03G

Abstract:
1. A developing device, comprising: a first transporting member that is rotatably driven, and holds, on an outer circumferential surface, a developer containing a toner and a carrier while the developer is transported, a second transporting member that is rotatably driven, and is opposite to the first transporting member to interpose a first spatial region between the members, and is opposite to an electrostatic latent image carrying member to interpose a second spatial region between the second transporting member and the carrying member, a first electric field forming device that includes a first power source connected to the first transporting member and a second power source connected to the second transporting member, forms a first electric field between the first and second transporting members, and shifts the toner in the developer held onto the first transporting member to the second transporting member, and a second electric field forming device that includes the second power source connected to the second transporting member, forms a second electric field between the second transporting member and the electrostatic latent image carrying member, and shifts the toner held onto the second transporting member to an electrostatic latent image of the electrostatic latent image carrying member, thereby converting the electrostatic latent image to a visible image, the developing device further comprising: a first detecting block that detects a current flowing in the first power source, a second detecting block that detects a current flowing in the second power source, and an electric field controlling device that controls operation of the second electric field forming device based on the current flowing in the first power source, which is detected by the first detecting block, and the current flowing in the second power source, which is detected by the second detecting block.