Charging roller with blended ceramic layer

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

G - Physics

03

G

G03G 15/02 (2006.01) H05B 3/00 (2006.01) H05B 3/14 (2006.01) H05B 3/46 (2006.01)

Patent

CA 2146339

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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