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Charging mask for electrophotography

Image Number 2 for United States Patent #3991311.

Disclosed is an improved apparatus for applying a uniform electrostatic charge to a predetermined portion of an electrophotographic film. The apparatus includes a corona generation source and a mask framing the predetermined portion of the film. The improvement consists of an electrically conductive surface surrounding the frame opening of the mask and spaced from the surface of the film and a capacitor interconnecting the electrically conductive 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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