| 摘要 |
The present invention is directed to an image forming apparatus and its control method, which apparatus having a laser pulse arithmetic circuit for counting a time period in which a laser pulse signal is in an ON state, a temperature sensor for monitoring temperature in a developing unit and output temperature data, a humidity sensor for monitoring humidity in the developing unit and output humidity data, a control section for calculating consumption of toner in the developing unit on the basis of a counted value of the laser pulse arithmetic circuit, temperature data obtained from the temperature sensor and humidity data obtained from the humidity sensor, thereby calculating a toner supply time period to maintain a constant toner amount in the developing unit, and a toner supply section for supplying toner into the developing unit on the basis of the toner supply time period calculated by the control section.
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