Patent ID: 7941073

Claim:
A toner cartridge system comprising: a toner cartridge and a toner, the toner cartridge including: a toner storing container of a rectangular shape having a toner feeding opening in an angular portion thereof; a stirring conveying member that is disposed so as to rotate in a predetermined rotation direction in the toner storing container and stirs and conveys the toner in the toner storing container toward the toner feeding opening, wherein the stirring conveying member includes a shaft and an agitator film, the agitator film including a plurality of slits having a predetermined slope angle, a concave portion, and cuts formed at the tip of the agitator film; a waste toner storing container that stores reclaimed toner; and a partition member, held by the toner storing container, that partitions the toner cartridge into the toner storing container and the waste toner storing container, a bearing portion of the partition member axially supporting the shaft of the stirring conveying member extends to an inside of the waste toner storing container, the toner stored in the toner storing container having an average value of a shape factor (SF1) defined by a following equation (1) of about 130 or less, SF 1=100×(π/4)×( ML 2 /S ) (1) wherein π(pi) represents circle ratio, ML represents an absolute maximum length of a toner particle, and S represents a projected area of the toner particle.