ANNULAR ELECTRODE FOR USE IN AN OUT-OF-CONTACT ELECTROGRAPHIC SYSTEM
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
It has been observed that latent images formed by discharges from printheads 1 having well-polished electrodes 2 (Figure 1) frequently result in doughnut-shaped images. It is believedsuch images are created because with smooth electrodes, field emission, which provides the spark initiating electrons, is most likely to occur at the electrode edges 4 where field enhancement is significant. Furthermore, electrons emitted from the edges cannot cross the electric field lines 3 between the central regions 10 of the electrode 2 and the dielectric imaging material 12. Since the electrons cannot cross the field, no charge is deposited directly beneath the center 10 of the electrode 2.