Monday, June 25, 2012

US Patent 8204407 - CNT corona wires

Corona wires are important components of electrophotographic laser printers used for creating electric charge on a photosensitive drum. This patent from Xerox teaches how carbon nanotubes can produce corona wires with improved durability. Claim 1 reads:

1. A charging device comprising:

a receptor; and

a wire coronode disposed opposing and spaced apart from the receptor,

wherein the wire coronode comprises one or more carbon nanotube yarns arranged to emit a corona charge to the receptor using a low operating voltage, and each of the one or more carbon nanotube yarns has a minor dimension of about 100 microns or less and a resistivity of about 4×10−4 Ω-cm or less.