| 摘要 |
A toner cartridge 20 has a cartridge main body 21 as a container filled with a developer and a shutter mechanism 25 that opens and closes a developer discharging orifice 231 formed in the cartridge main body 21. The cartridge main body 21 has a pair of end walls (left end wall 22 and right end wall 23) opposing each other and a barrel 24 installed between a pair of these end walls 22 and 23. A shape of a cross section of the barrel 24 orthogonal to a direction of a tube center line is set to a shape of a Reuleaux polygon. |
