Bias charge roller with optimally induced AC corona

US6807389B2 · kind B2 · utility

Assignee

• Xerox Corporation · US

Inventors

• John S. Facci · Webster, US
• Michael J. Levy · Webster, US
• Paul W. Morehouse, Jr. · Webster, US
• Rachael L. McGrath · Churchville, US

Key dates

• Filing date: Dec 13, 2002
• Grant date: Oct 19, 2004
• Expiry date: Dec 22, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G2215/021
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of a member to be charged such as a photoreceptor. The bias charge roll member is supplied with an electrical bias having a variable voltage waveform onto which a DC bias is superimposed. The amount of DC bias is selected to set the signal voltage such that a minimally acceptable amount of AC corona is created sufficient for uniform photoreceptor charging while avoiding unnecessary excessive positive corona that causes excessive photoreceptor wear.