| 摘要 |
In a developing apparatus of the present invention, a voltage applying circuit applies a developing bias voltage obtained by superimposing a DC component on an AC component to the developer carrying member. A bias voltage controller controls the voltage of the DC component based on at least one of a voltage range between the highest and lowest voltages of a waveform of the developing bias voltage and the ratio of time during which the waveform has a value higher or lower than a reference voltage to one period of the AC component. The reference voltage is set so that an area occupied by a portion of the waveform of the developing bias voltage in which the developing bias voltage has a value higher than the reference voltage is equal to an area occupied by a portion of the waveform in which the developing bias voltage has a value lower than the reference voltage.
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