Copying process with patterned charge injection into charge transport layer

摘要

A copying process in which a pattern of charged and uncharged areas is superimposed on a charge image by charging and exposing image-wise an electrophotographic element which is provided with a charge-transporting top layer having therebeneath a charge-generating layer which can inject charges into the charge-transporting top layer at areas corresponding to said pattern of uncharged areas, but cannot inject charges into the other areas of the charge-transporting top layer. The charge image is developed with a developing powder having a resistivity of less than 1012 ohmsxcm and the resulting powder image is transferred to a receiving material and fixed thereon. The pattern of charged and uncharged areas is provided to produce a uniform light-grey image where desired.