Treating an electrostatic latent image with charge of same...

Details Treating an electrostatic latent image with charge of same... Treating an electrostatic latent image with charge of same...

G - Physics

03

G

32/12, 117/2

G03G 13/02 (2006.01) G03G 15/02 (2006.01) G03G 15/045 (2006.01) G03G 15/06 (2006.01)

Patent

CA 1073279

ABSTRACT OF THE DISCLOSURE To improve the quality of copies made on an electrostatic reproduction machine, a post exposure pre- development corona generating device is used to treat an electrostatic latent image on a photoreceptor. The device deposits a treating charge onto the latent image of the same polarity as the latent image the treating charge being of a magnitude sufficient to lower the charge contrast between the background of the latent image and undesirable low density image areas, but not sufficient to detrimentally affect other areas of the latent image. The treating charge may be varied upwardly or downwardly to obtain the desired result, but as it is varied, an electrical bias applied to a developer is simultaneously varied in the same direction so that the magnitude of the bias is always a substantially constant amount above the magnitude of the charge on the background of the latent image.

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