Patent ID: 8175500

Claim:
A toner cartridge comprising: a toner storing portion for storing toner; a toner discharging portion having a toner discharge port; and, a toner conveying screw having a rotary shaft and a helical blade for conveying the toner in the toner storing portion to the toner discharging portion, characterized in that the helical blade includes a first helical blade portion located over the toner discharge port and a second helical blade portion located in the toner storing portion, wherein a first helical pitch of the first helical blade portion is greater than a second helical pitch of the second helical blade portion, a first toner thrust face of the first helical blade portion, located on a downstream side with respect to a toner conveying direction is formed at a first inclination angle to an axial direction of the rotary shaft, a second toner thrust face of the second helical blade portion, located on a downstream side with respect to the toner conveying direction is formed at a second inclination angle to the axial direction of the rotary shaft, and the first inclination angle is formed to be smaller than the second inclination angle.