Biased charge roller with embedded electrodes with post-nip...

Details Biased charge roller with embedded electrodes with post-nip... Biased charge roller with embedded electrodes with post-nip...

2007-02-13

2007-02-13

Beatty, Robert (Department: 2852)

Electrophotography

Image formation

Charging

Reexamination Certificate

active

10875554

ABSTRACT:
Electrodes are embedded in a biased charge roller of a xerographic device. The electrodes, which may run the length of the roller, are deposited on an insulating substrate. A semi-conductive conformable layer of a flexible elastomer covers the electrodes. The semi-conductive conformable layer limits current flow between electrodes and relaxes charge deposited on the roller surface. Stationary pre-nip and post-nip contacts apply the bias to the imbedded electrodes. The electrodes in the post nip region are biased to VPOST. The electrodes positioned in the pre-nip regions are either grounded or biased to VPRE<VPOST. The electroded biased charge roller may generate air breakdown in the post nip region, resulting in highly uniform charging.

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