While operating of 3 level image formation device form 3 level image on the electric charge containment surface manner and the device

摘要

A pair of Electronic Voltmeters (ESV) are utilized to control theP/R charging voltage in a Tri-Level imaging apparatus. One of the ESVs isused to control the voltage increases of a charging device. The other ESV isused to monitor the charge level of the charged area image of a Tri-Levelimage. When a critical value is sensed the control of the charging device isshifted to the ESV that monitors the charged area image level and limits theoutput from the charging device to a predetermined target value..