Process and arrangement for generating high-quality matrix print using electrophotographic printing equipment

摘要

PCT No. PCT/EP94/00323 Sec. 371 Date Aug. 10, 1995 Sec. 102(e) Date Aug. 10, 1995 PCT Filed Feb. 4, 1994 PCT Pub. No. WO94/18786 PCT Pub. Date Aug. 18, 1994An electrophotographic process and arrangement for generates a macro-charge zone inkable by toner applicators and delimited by an inking limit (EG) having an adjustable contour on a photoconductor of a printing or copying machine, using at least one exposure-variable and position-variable controllable light source (LED), such as an LED comb or laser. By controlling the exposure of the light source and its radiation position on the photoconductor and by controlling a bias voltage (UB) which can be applied between photoconductor and toner applicator, an electrostatic potential relief (UR) made up of individual adjacent micro-charge zones (UM) of exposure-dependent size is generated on the photoconductor and the inking limit (EG) is defined, the contour of the inking limit being determined by the bias voltage level (UB) on the potential relief (UR). The process and the arrangement allow an offset-like printing quality to be obtained, both with respect to the generation of half-tone images and of lines and characters.