METHOD AND APPARATUS UTILIZING CORONA ERASE FOR IMPROVING A MULTI-COLOR ELECTROPHOTOGRAPHIC IMAGE

摘要

An improvement in the method and apparatus for producing a multi-color electrophotographic image wherein an electrophotohraphic medium (16) can be used for multiple charge-expose cycles without the accumulation of trapped charges which can result in an increase in toe voltage. After the charging, exposing and toning of the medium (16) to produce a first color visible image, the carrier (12) is then returned to the first position to repeat the foregoing steps to charge, expose and tone to produce a second color visible image. Prior to the second charging step the medium (16) is reverse charged and trapped charges are neutralized to substantially revitalize the medium to a condition closely resembling its unused condition to substantially eliminate the rise in toe voltage.