IMAGE FORMING AGENT STORAGE UNIT, METHOD FOR FILLING IMAGE FORMING AGENT STORAGE UNIT WITH IMAGE FORMING AGENT, AND IMAGE FORMING APPARATUS

摘要

An image forming agent storage unit includes a body portion and a pair of a protrusion portion. The body portion extends in an insertion direction in which the image forming agent storage unit is inserted into an image forming apparatus. The pair of a protrusion portion is disposed on an outer face of the body portion and extends along the insertion direction. An approximate geometrical center of gravity of a cross-sectional shape of the body portion is disposed between the pair of the protrusion portion. One of the protrusion portions is disposed on an upper right angle position between an upper portion of the body portion and a right portion of the body portion and the other of the protrusion portions is disposed on a lower left angle position between a lower portion of the body portion and a left portion of the body portion.