| 摘要 |
To provide age forming device and a developing cartridge used in the image forming device capable of performing high-speed image forming operation for forming high-quality images and of reliably detecting an accurate amount of remaining toner. An agitator and a developing roller provided to a developing cartridge are driven to rotate independent from each other. During the detection of the remaining toner amount, the agitator is rotated at a lower speed so as not to stir up the toner. On the other hand, the agitator is rotated at a higher speed during the image forming operations, so that the toner efficiently circulates within the developing cartridge, thereby forming preferable images.
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