Browse Prior Art Database

Original Publication Date: 1990-Apr-30
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal


A highlight color copier exposure is enabled by forming three levels of exposure at a photoreceptor during a single pass scan cycle. A high frequency half-tone original document is created at an electronic workstation, the document having an average density of approximately 0.3 (50% reflecting). The foreground images are created either as black characters or white characters. The black characters will not discharge the photoreceptor and will consequently be copied with black toner. The background areas which appear gray provide a partial discharge of the photoreceptor and will be developed by neither the black nor highlight color toners. The white areas of the document will completely discharge the photoreceptor and will subsequently be developed by the reversal highlight color toner. Figure 1 shows how such a system will produce the desired photoconductor discharges.