Apparatus for reducing image background in electrostatic reprodu

Details Apparatus for reducing image background in electrostatic reprodu Apparatus for reducing image background in electrostatic reprodu

1973-11-08

1976-12-14

Hix, L. T.

Photocopying

Including fiber optics

96 1C, G03G 1522

Patent

active

039972593

ABSTRACT:
To enhance copy quality in an electrostatic type copier or reproduction machine, the photoconductive surface bearing the latent electrostatic image of the original being copied is, before development, exposed to a second charge generating device producing a relatively low charge opposite in polarity to the original charge. The aforesaid second charge is desirably equal to or less than the image background voltage, and serves to reduce overall image charge and thereby neutralize to a large extent the image background voltage without changing or upsetting the image voltage contrast. A low emission scorotron positioned between imaging and developing stations may serve as the second charge generating device.

REFERENCES:
patent: 3535036 (1970-10-01), Starkweather
patent: 3615395 (1971-10-01), Yamaji et al.
patent: 3730709 (1973-05-01), Kinoshita et al.
patent: 3809472 (1974-05-01), Liechty

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