Charging mask for electrophotography

Details Charging mask for electrophotography Charging mask for electrophotography

G - Physics

03

G

314/39

G03G 15/02 (2006.01)

Patent

CA 1053743

Abstract of the Disclosure Disclosed is an improved apparatus for applying a uniform electro- static charge to a predetermined portion of an electrophotographic film. The apparatus includes a corona generation source and a mask framing the predeter- mined portion of the film. The improvement consists of an electrically con- ductive surface surrounding the frame opening of the mask and spaced from the surface of the film and a capacitor interconnecting the electrically conduc- tive surface with ground. The electrically conductive surface on the mask develops a voltage close to that of the surface potential of the film during corona charging so that very little charge field discontinuity exists between the mask and the film, thereby permitting uniform electrostatic charging of the film up to the edges of the portion being charged.

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