Patent ID: 7679880

Claim:
An electrostatic chuck ( 1 ) with a built-in electric heating means comprising a base plate ( 2 ) formed of carbon or a carbon-based composite material and, successively formed on one surface of the base plate ( 2 ), an insulating layer ( 3 ) an electroconductive layer ( 4 ) to serve as a chucking electrode and a dielectric layer (( 6 )) to form a workpiece-chucking surface and, successively formed on the other surface of the base plate ( 2 ), an insulating layer ( 3 ) and an electroconductive layer ( 5 ) to serve as an electric heater element, said electrostatic chuck being improved in that said workpiece-chucking surface of the electrostatic chuck and an opposite surface thereto are warped to have a relationship selected from concavo-convex and convexo-concave, and in that the warping of said surfaces is in a manner such that the workpiece-chucking surface of the dielectric layer is rendered flat when said opposite surface of the electrostatic chuck is fixed flat to an apparatus without a help of heat.