Constant current charging device

Details Constant current charging device Constant current charging device

1975-01-02

1976-01-27

Miller, J. D.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250325, H01T 1900

Patent

active

039355179

ABSTRACT:
Application of a constant density of surface charge on a dielectric medium by non-contact charging is accomplished by a rotatable charging roll having a relaxable layer surrounding a conductive axle and a protective leaky insulator overcoat layer applied to the relaxable layer. The charging roll is spaced from the dielectric medium to define an air gap of about 0.010-0.060 inch and the surface velocity of the charging roll is adjustable relative to the velocity of the moving dielectric medium. A constant current power source is coupled to the conductive axle to generate a charge buildup on the surface of the relaxable layer; part of this charge is transferred across the air gap to the surface of the dielectric medium. A blade or brush is provided to clean the charging roller as it rotates.

REFERENCES:
patent: 3233156 (1966-02-01), Jarvis et al.
patent: 3254215 (1966-05-01), Oliphant
patent: 3716755 (1973-02-01), Marx
patent: 3781105 (1973-12-01), Meagher

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