Corona discharge device for electrographic apparatus
AssigneeOlympus Optical Co., Ltd.
InventorsMasaji Nishikawa, Muneo Kasuga
Life of this patent
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Abstract
A corona discharge device for electrographic apparatus which makes use of a drum-shaped photosensitive screen. The device is provided with a corona electric field establishing electrode extending in parallel with a corona discharge wire and supplied with an electric potential which is intermediate the electric potential of a field electrode and the electric potential of the corona discharge wire.
Claims8
In a corona discharge device for electrographic apparatus employing a corona discharge wire, a field electrode for establishing a backing electric field and a high voltage source connected between said corona discharge wire and said field electrode, the improvement comprising:
- two corona electric field establishing electrodes (5, 5;
- 13, 13) are provided without any other electrically conductive electrode, said two electrodes (5, 5;
- 13, 13) being formed of two thin bar-shaped conductors, spaced apart from each other and arranged between said corona discharge wire (1) and said field electrode (3) in such a position that a flow of corona ions directed from said corona discharge wire (1) directly toward said field electrode (3) passes between said two electrodes (5, 5;
- 13, 13) without being disturbed by said two electrodes (5, 5;
- 13, 13), and means for applying an electrical potential intermediate between a potential of said corona discharge wire (1) and a potential of said field electrode (3) to said corona electric field establishing electrodes (5, 5;
- 13, 13).
Dependencies are inferred from the claim text.