Browse Prior Art Database

Original Publication Date: 1987-Dec-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


It has been found that when using corona generating devices that produce a negative corona desirable for use particularly with AMAT-type photoconductive surfaces operating with a negatively charged surface, certain difficulties may be observed. It is believed that various nitrogen oxide species are produced by the corona, and that these nitrogen oxide species are adsorbed by solid surfaces. In particular, it is believed that these oxide species are adsorbed by the conductive shield, the housing and the screen or control grid of the corona generating device. This adsorption occurs despite the fact that, during operation of an electrophotographic machine, the corona generating device may be provided with a directed air flow to remove nitrogen oxide species as well as ozone from the area adjacent the corona generating device. After exposure to the nitrogen oxide species, when the electrophotographic machine is turned off for an extended period, and corona is not produced by the corona generating device, the adsorbed nitrogen oxide species are gradually desorbed, i.e., the adsorption is a physically reversible process. When operation of the machine is resumed, a copy quality defect is observed in the copies produced comprising a line image deletion or lower density image formed across the photoconductive surface at the portion of the surface which was at rest opposite the corona generating device during the period of idleness.