Patent ID: 8285164
Filing Date: 2012-10-09
Classification: G03G

Abstract:
1. A developing device, comprising: a developer transporting member that is rotatably driven, and transports a developer containing a toner and a carrier while the member holds, on an outer circumferential surface thereof, the developer, a toner transporting member that is rotatably driven, and is opposite to the developer transporting member and opposite to an electrostatic latent image carrying member so as to transport the toner, a first electric field forming device that includes a power source for the developer transporting member connected to the developer transporting member, and a power source for the toner transporting member connected to the toner transporting member, forms a predetermined electric field between the developer transporting member and the toner transporting member, and shifts the toner in the developer held onto the developer transporting member to the toner transporting member, and a second electric field forming device that includes the toner transporting member power source connected to the toner transporting member, forms a predetermined electric field between the toner transporting member and the electrostatic latent image carrying member, and shifts the toner held onto the toner transporting member onto an electrostatic latent image on the electrostatic latent image carrying member, the developer being used to develop the electrostatic latent image on the electrostatic latent image carrying member, and after the development a fraction of the toner which remains on the toner transporting member being collected to the developer transporting member, the developing device further comprising: a detecting block that detects a current flowing in the developer transporting member power source, and an electric field controlling device that controls operation of the first electric field forming device based on the current flowing in the developer transporting member power source, the current being detected by the detecting block.