Backup roll with capacitive coating and an imaging device transfer station employing the backup roll

US8433227B2 · kind B2 · utility

Assignee

• Lexmark International, Inc. · US

Inventors

• Bryan Michael Blair · Lexington, US
• Bartley Charles Gould, II · Lexington, US
• Peter Brown Pickett · Lexington, US
• Julie Ann Gordon Whitney · Georgetown, US

Key dates

• Filing date: Aug 20, 2009
• Grant date: Apr 30, 2013
• Expiry date: Apr 27, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G15/1605
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A toner transfer station of an electrophotographic imaging device employs a backup roll having an inner electrically grounded cylindrical metal base core and an outer surface layer disposed about the inner base core. The outer surface layer may be formed of a polyurethane elastomer material to provide a capacitive coating with a thickness greater than 15 microns, a dielectric constant less than 12 and a resistivity of less than 3.00E+13 Ohm-cm.