Developer storage device and image forming apparatus having the same

An image forming apparatus, comprising:

• an image carrier;
• and
• a developer storage device to store a new developer to be supplied to the image carrier or a waste developer collected from the image carrier, comprising:
• a developer storage part including a first storage part and a second storage part having widths different from each other, and
• a developer conveying member to convey a developer stored in the first storage part to the second storage part by a reciprocating motion in the developer storage part, and
• wherein the developer conveying member includes conveying ribs extended in a diagonal direction with respect to a width direction of the developer storage part.

An image forming apparatus, comprising:

• a plurality of developer storage parts to store waste developer therein;
• and
• a conveying member to convey the waste developer a first of the plurality of developer storage parts to another of the plurality of the developer storage parts, the conveying member comprising:
• a plurality of conveying ribs extending from a center portion of the conveying member at acute angles to convey the waste developer from, and
• an arrangement angle changing portion to decrease the acute angles of the conveying ribs as the conveying ribs move away from the center portion of the conveying member.