| 摘要 |
An electrostatic charging system for an electrophotographic copying machine comprises a photoreceptor, electrostatic charger, an a.c. high voltage transformer for driving the electrostatic charger and a photoreceptor current detector. The transformer is enclosed with a conductive casing insulated from ground and one output of the secondary winding of the transformer is connected to the casing so that leakage current generated in the transformer is subjected to be fed back to the transformer itself through the conductive casing, avoiding the leakage current to flow into the photoreceptor current detector, whereby photoreceptor current can be detected with accuracy.
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