Semi-conductor corona generator for production of ions to charge

Details Semi-conductor corona generator for production of ions to charge Semi-conductor corona generator for production of ions to charge

1990-11-23

1993-09-14

Pellinen, A. D.

Electricity: electrical systems and devices

Electric charging of objects or materials

355219, H01T 1904

Patent

active

052455025

ABSTRACT:
The device has a glass-like substrate of variable configurations. Three layers of thin paint-like material is uniformly deposited upon the substrate. The first and third layers are an electrically resistive material, the second layer is a dielectric material. An air gap, descending through all three layers, runs the width of the device. Thus, in operation, energizing the resistive layers in varying configurations of potentials will strike a gaseous plasma in a narrow gap thus ionizing air molecules. In the preferred arrangement, a high potential is applied to the first or innermost resistive layer to strike a plasma and generate ions. A fraction of these ions flow outwardly through the gap past the third or outer resistive layer and may be accelerated to the charging charge retentive surface. By specifying the third or outer layer's potential, the flow of ions to the charge retentive surface is regulated (acting like a control grid) such that ion flow will proceed only until the charge retentive surface potential reaches equality with that applied to the third or outer layer. Further charging ceases and the charge retentive surface is left with a uniform potential equal to that applied to the third or outer layer. Thus the device can be advantageously applied to charge or discharge surfaces to very uniform predetermined potentials in an electrographic apparatus.

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