Development system

摘要

An apparatus which develops a latent image by transporting marking particles into contact therewith at least two successive times. An operator adjustable voltage source is coupled to the marking particle transport to electrically bias the transport to at least either a first electrical potential optimizing development of solid areas with the marking particles during the first contact time or to a second electrical potential suppressing development of solid areas. The transporting means is electrically biased to an electrical potential substantially optimizing development of lines with the marking particles during the second contact time.