| 摘要 |
PURPOSE:To generate a stable development AC bias voltage while facilitating adjustment, by generating the bias voltage through a boosting transformer by making the output of a sine-wave oscillating circuit constant by an amplifier brought under AGC control. CONSTITUTION:A sine-wave AC voltage from a sine-wave oscillating circuit 9a or 9b with a different frequency is controlled in accordance with a difference between a reference voltage and the DC voltage of a rectifying circuit which changes a feedback input into the DC voltage, and then amplified by an amplifying circuit 10 brought under the gain control of an AGC circuit 17 equipped with an FET, etc. Therefore, a constant-level sine-wave AC voltage is generated by the circuit 10 and boosted by a boosting transformer 11 to generate a high-efficiency, low-noise stable development AC bias voltage while resonance and frequency adjustement are facilitated. As a result, a development bias device for an electrostatic recorder capable of formaing an image with excellent reproducibility is obtained. |
