Apparatus for automatically regulating the amount of charge appl

Details Apparatus for automatically regulating the amount of charge appl Apparatus for automatically regulating the amount of charge appl

1974-07-03

1976-01-20

Lawrence, James W.

Radiant energy

Corona irradiation

Charging of moving object

250324, 250326, 317262A, G03B 1502

Patent

active

039341410

ABSTRACT:
Apparatus for automatically regulating the amount of charge applied to an insulating surface. In a first embodiment an electrometer measures the electrostatic potential, or charge, on the insulating surface and generates an output voltage proportional thereto. The output voltage is continuously monitored and compared in a comparison means with a reference potential, the difference therebetween corresponding to an error signal. The error signal is periodically sampled and applied to an analog incremental integrator, the output thereof being coupled to a corona generator power supply, the power supply in turn being coupled to a corona electrode. The voltage applied by the power supply to the corona electrode is of a magnitude to cause the wire to apply sufficient charge to the insulating surface to reduce the error signal to substantially zero. In a second embodiment the output of the comparison means is sampled and delayed and then coupled to the corona generator power supply. A digital incremental integrator, which may be utilized in lieu of the analog incremental integrator, is also disclosed.

REFERENCES:
patent: 3489895 (1970-01-01), Hollberg
patent: 3586908 (1971-06-01), Vosteen
patent: 3604925 (1971-09-01), Snelling et al.
patent: 3699335 (1972-10-01), Giaimo
patent: 3775669 (1973-11-01), Baker
patent: 3819942 (1974-06-01), Hastwell

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