Browse Prior Art Database

Original Publication Date: 1998-Apr-30
Included in the Prior Art Database: 2004-Apr-08

Publishing Venue

Xerox Disclosure Journal


Disclosed is method and means for low cost optimization of the efficiency and transfer function of a corotron charger which is afforded by shaping the transfer current profile independently of the corotron geometry. The method and means are useful in electrophotographic printing and copying machines, for example, as found in a Xerox Corporation Model 5100 copying machine. The method and means comprises a protective guard consisting of a wire which laterally circumscribes the length of the corotron wire. The guard wire can be, for example, two millimeters in diameter, and which guard wire is mounted within the corotron housing parallel to, and closer to the photoreceptor than the corotron, and situated slightly upstream and downstream from the corotron wire. The wire guard was unexpectedly found to affect the shape of the transfer current profile in a favorable manner, for example, increasing the relative peak intensity and narrowing the peak width relative to a control corotron without the guard wire, and which shaped profile thereby markedly facilitated transfer efficiency and copy quality of the printing device.