Charging roller with blended ceramic layer

Details Charging roller with blended ceramic layer Charging roller with blended ceramic layer

1995-03-13

1997-02-04

Barlow, Jr., John E.

Electrophotography

Image formation

Charging

361225, 492 53, 492 59, G03G 1502

Patent

active

056004141

ABSTRACT:
A charging roller for use in a xerographic copying machine includes a cylindrical roller core, and a ceramic layer formed by plasma spraying a blend of an insulating ceramic material and a semiconductive ceramic material in a ratio which is selected to control an RC circuit time constant of the ceramic layer in response to an applied voltage differential. The ceramic layer is sealed with a solid, low viscosity sealer, such as Carnauba wax, to protect the ceramic layer from moisture penetration.

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