Browse Prior Art Database

Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


As shown in the figure, a disc 10 having a dielectric outer layer 12 rotates in the direction of arrow 14. Segmented electrodes 16 are disposed within the dielectric layer 12 and connected to an insulating hub 18. Hub 18, in turn, is electrically connected to an AC meter 20. Both meter 20 and the conductive substrate 22 of photoconductive member 24 are electrically grounded. Disc 10 rolls over the photoconductive surf ace 26 of the photoconductive member 24. Photoconductive member 24 has areas devoid of the toner powder image and areas with toner powder image thereon. Disc 10 generates an AC signal proportional to the potential of the surface that it contacts. Inasmuch as the layer of toner particles varies the potential of photoconductive member 24, a signal is generated. This electrical signal may be used to control any of the processing stations in the electrophotographic printing machine such as charging, toner dispensing, exposure, etc.