METHOD AND APPARATUS FOR ELECTRICALLY BIASING DEVELOPING ELECTRODE OF ELECTROPHOTOGRAPHIC DEVICE

摘要

A photoconductive member useful in a wet-type electrographic device is char?ed and radiated with a light image to produce an electrostatic image. Sensing electrodes automatically sense through a developing solution the remaining potential in a portion of the electrostatic image corresponding to a background area of the original document scanned to produce the light image. In one embodiment the area is a white reference document disposed adjacent to the original document. In another embodiment a reference document is not provided and a plurality of portions of the electrostatic image are sensed. The lowest value of the sensed potential is utilized. Computing circuits compute and apply the biasing voltage to the developing electrode as a predetermined function of the sensed potential.