Patent ID: 8923723

Claim:
A developing device comprising: a developing container for accommodating a two-component developer containing a magnetic carrier and a toner; a toner carrier having some of an external peripheral surface exposed through an opening in the developing container, whereby the toner carrier is arranged so as to face an image carrier, the toner carrier supplying toner to the image carrier while rotating so that the surface facing the image carrier moves upward; a developer carrier which is placed facing the toner carrier, the developer carrier rotating so that a surface facing the toner carrier moves in the opposite direction of the toner carrier, and a toner layer being formed on the toner carrier using a magnetic brush comprising a two-component developer carried on a surface of the developer carrier; a regulating member for regulating the amount of developer carried on the developer carrier; and an air outflow channel for communicating an airflow outlet formed in a top end of the developing container facing the toner carrier with the interior of a duct placed above the developing container, the air outflow channel being inclined downstream in the rotational direction of the toner carrier relative to a straight line passing through the rotational axis center of the toner carrier and the airflow outlet, wherein the airflow outlet is provided to a position, relative to the rotational direction of the toner carrier, that is farther downstream than a vertical line passing through the rotational axis center of the toner carrier, and that is farther upstream than a position distanced 90° upstream from the facing portion of the developer carrier and the toner carrier.