Charge level control for an electrochargeable medium

Details Charge level control for an electrochargeable medium Charge level control for an electrochargeable medium

1982-02-26

1984-02-14

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 77, 250325, 430 35, G03G 1500

Patent

active

044313020

ABSTRACT:
Apparatus is described for providing controlled corona charging of an electrophotographic member that moves past a corona charging electrode. A corona sensor probe near the charging electrode receives a sample of the corona current flow from the electrode that is proportional to the current flow as it may be modified by extraneous influence, including air pressure, humidity, and corona electrode potential. The probe produces a signal that is adapted to vary the movement rate of the member past the charging electrode, being faster for a sensed increase of corona current and slower for a sensed decrease of corona current. The effective result is an electric charge on the electrophotographic member surface that is uniformly about constant, independent of the variations wrought by most external influences.

REFERENCES:
patent: 3564239 (1971-02-01), Kushima
patent: 3649114 (1972-03-01), Vlach et al.
patent: 3787706 (1974-01-01), De Geest
patent: 3944354 (1976-03-01), Benwood et al.

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