Corona-charging apparatus

Details Corona-charging apparatus Corona-charging apparatus

1985-06-10

1986-10-21

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3CH, 361229, G03G 1502

Patent

active

046182497

ABSTRACT:
A corona-charging apparatus includes a conductive control grid, at least one corona-emitting electrode, and means for providing a current supply to the electrode. Current is sinked from the grid through a variable resistance, and means are provided for sensing the voltage produced on the insulating surface to be charged.
The electrode power supply is AC, and the grid current sink includes a rectifier circuit. Means, responsive to the sensed voltage adjust the conductivity of the variable resistance in accordance with a predetermined program to thereby maintain the charge on the surface substantially constant.

REFERENCES:
patent: 3678350 (1972-07-01), Matsumoto et al.
patent: 4096543 (1978-06-01), Kozuka et al.
patent: 4312589 (1982-01-01), Brannan et al.

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