| abstract |
PROBLEM TO BE SOLVED: To provide a developing device and an image forming apparatus in which a developer conveying portion is hardly bent. In a developing device 200 including a developing tank 201 that stores a developer and a developing roller 204 that carries and supplies the developer, the developing tank 201 has a first shape that surrounds a side surface of a virtual cylinder. and a two or more first deflection preventing beam 202b provided in parallel to the axis N 1 of the virtual cylinder and spiral blade 202a, the developing roller by rotational movement about the axis N 1 of the virtual cylinder 204 a first developer conveying unit 202 for conveying the developer toward providing a first deflection preventing beam 202b, provided over a plurality of locations at the outer peripheral portion T 1 of the first spiral blade 202a, and the virtual shape of the cross section perpendicular to the axis N 1 of the cylinder is provided such that the fan-shaped base around the said axis N 1. [Selection] Figure 5 |