Patent ID: 8824933

Claim:
A developing device comprising: an agitating and conveying unit that receives a developer formed of carrier and toner, and includes at least one agitating and conveying member to mix and agitate the developer and convey the developer in a developer conveying direction; and a developing roller that is installed facing a photosensitive drum to receive an electrostatic latent image is formed thereon, and that attaches the developer mixed and agitated by the agitating and conveying unit to an outer circumferential surface of the developing roller and that supplies the developer to the photosensitive drum, wherein the agitating and conveying member comprises: a support shaft that extends in the developer conveying direction and is rotatably coupled to the developing device; a plurality of agitation wings that are disposed on an outer circumferential surface of the support shaft and to mix and agitate the developer and to convey the developer along the developer conveying direction; and a plurality of paddles which protrude in a radial direction from the support shaft and form along a direction of the support shaft between the plurality of agitation wings and has a height increasing from an upstream end of the support shaft to a downstream end of the support shaft, the plurality of paddles disposed along the support shaft to have the same phase with one another.