Patent ID: 7831158
Filing Date: 2010-11-09
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a toner supplying unit to supply toner; a toner transporting unit to transport the toner supplied from the toner supplying unit; a sensor to sense a density of the toner transported by the toner transporting unit; a compensating signal generating unit to compensate for amounts of the toner pre-supplied by the toner supplying unit; and a control unit to generate a control signal to control the toner supplying unit by receiving a sensing signal of the sensor as an input signal and a compensating signal of the compensating signal generating unit as a feedback signal, wherein the compensating signal generating unit comprises: a plurality of shift registers to consecutively update the control signal of the control unit at a prescribed period and to store the control signal; and a summing counter to sum the control signal stored in the plurality of shift registers at the prescribed period to generate the compensating signal.