Wednesday, November 28, 2007

US Patent 7301109 - CNT/Ni/Cu/Ni EMI shield

With the increase in mobile wireless electronics problems related to electromagnetic interference (EMI) are increasing. This patent from Hon Hai Precision teaches an EMI shield for electronics devices that uses carbon nanotubes a laminate structure which is resistant to wear. Claim 1 reads:

1. A wear resistant electromagnetic interference (EMI) shield for application to various substrate surfaces of electronic equipment, comprising sequentially: a metallic film or multiple metallic films in which at least one film contains nickel; and a carbon-nanotube (CNT) coating formed on a surface of said metallic film or multiple metallic films; wherein said metallic film or multiple metallic films cooperate with the carbon-nanotube coating to shield EMI coming from the electronic equipment; and said multiple metallic films include one copper film and two nickel films, with the EMI shield having a structure of CNT/Ni/Cu/Ni/.