Patent ID: 7352555

Claim:
An electrostatic chuck, comprising: a first insulating layer comprising a heat conductive silicone rubber with a thermal conductivity of at least 0.2 W/mK, which is formed on top of a metal substrate, either directly or with an adhesive layer disposed therebetween, a conductive pattern, which is formed on top of said first insulating layer, either directly or with an adhesive layer disposed therebetween, a second insulating layer comprising an insulating polyimide film, which is formed on top of said conductive pattern, either directly or with an adhesive layer disposed therebetween, and a third insulating layer comprising a heat conductive silicone rubber with a thermal conductivity of at least 0.2 W/mK, a hardness of no more than 85, and a surface roughness of no more than 5 μm, which is formed on top of said second insulating layer, either directly or with an adhesive layer disposed therebetween.