Sharp Kabushiki Kaisha Corporation

Yahata Electric Works Ltd.

Shoshichi Kato

Hiroshi Kinashi

Yoshihisa Miwa

Hiroyuki Kawataki

An electrophotographic apparatus employs an alternating current corona discharge apparatus for the purpose of forming an electrostatic image on a photosensitive member. The alternating current corona discharge apparatus has a transformer for transforming or stepping up the alternating current source voltage, the secondary winding of which is connected to the ground at one end. The secondary winding is shunted by a series connection of a first plurality of varistors. A smaller second plurality of series connected varistors selected from the first plurality of series connected varistors are shunted by a first diode-resistor series connection of a diode with the cathode on the ground side and a variable resistor and a smaller and third plurality of different series connected varistors selected from the first plurality of series connected varistors are shunted by a second diode-resistor series connection of a diode with the anode on the ground side and a variable resistor. The non-grounded end of the secondary winding is connected to a wire electrode of the corona discharge apparatus and the grounded end of the secondary winding is connected to a shield plate enclosing the wire electrode.

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Yamatokoriyama, Japan

Shoshichi Kato