Patent ID: 7912409

Claim:
An exchangeable toner cartridge which can be attached to or detached from an apparatus main body, the toner cartridge comprising: a toner transfer member which is provided along a longitudinal direction of the toner cartridge in a toner accommodating space and which can rotate, wherein a first range of the toner transfer member on an upstream side in a toner transfer direction is formed into a substantially spiral shape and a second range of the toner transfer member on a side of a toner supply opening downstream in the toner transfer direction has a shape different from the shape of the first range, wherein a cross-sectional area perpendicular to the longitudinal direction of the toner accommodating space in a first portion of the toner cartridge is different than a cross-sectional area perpendicular to the longitudinal direction of the toner accommodating space in a second portion of the toner cartridge, wherein the cross sectional area of the toner accommodating space in the first portion of the toner cartridge is larger than the cross sectional area of the toner accommodating space in the second portion of the toner cartridge and the second portion is disposed downstream in the toner transfer direction in the toner transfer direction.