Patent ID: 8406640

Claim:
A toner cartridge that is configured to be removably attached to an image forming apparatus having at least two different process speeds, comprising: a toner container holding toner; a toner feed port for supplying the toner from the toner container to the image forming apparatus; a toner feeding member that is rotationally driven to supply the toner from the toner container to the image forming apparatus; and a recording module for recording history information on the toner container, wherein the toner container includes a toner feed motor for rotationally driving the toner feeding member; the recording module includes a recording portion for recording the history information, a supplied toner quantity totalizer for summing amounts of toner supplied from the toner feed port, and a residual toner quantity display controller for displaying the residual toner quantity in the toner container on a display portion of the image forming apparatus; the recording portion records an initial amount of toner stored in the toner container and a coefficient for each of the at least two different process speeds relative to a predetermined standard process speed of the image forming apparatus; the supplied toner quantity totalizer sums the amounts of toner supplied from the toner feed port by adding up, for each of the at least two different process speeds, products of the coefficient for the process speed multiplied by a drive time of the toner feed motor in supplying toner at the process speed; and, the residual toner quantity display controller calculates an amount of toner remaining in the toner container based on the summation of the products between the coefficients and the drive times, and displays the residual toner quantity on the display portion of the image forming apparatus.