Charge control system for xerographic machines

Details Charge control system for xerographic machines Charge control system for xerographic machines

G - Physics

03

G

314/15

G03G 15/02 (2006.01)

Patent

CA 1111097

CHARGE CONTROL SYSTEM FOR XEROGRAPHIC MACHINES ABSTRACT OF THE DISCLOSURE Apparatus for controlling the charge level on the photoconductive surface of a reproduction machine to enhance imaging. A corona generator is used to initially charge the photoconductive surface following which the charge is examined and compared with a preselected reference charge. Where an overcharge is found, a lamp, the illumination intensity of which is matched to the degree of overcharge, is actuated to reduce the charge level on the photoconductive surface to substantially the same as the reference charge. Where an undercharge is found, a supplemental charging device is actuated to the degree necessary to bring the charge level up to the reference charge. The discharge lamp may be combined with the corona generator or be separate therefrom. An alternate embodiment has a lamp providing a fixed illumination output is provided with a liquid crystal inter- posed between the photoconductive surface and the lamp to control the degree of illumination to which the photoconductive surface is subjected.

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