Patent ID: 7175737

Claim:
An electrostatic chucking stage for electro-statically chucking an object, comprising: a dielectric plate made of alumina on which the object is chucked; a chucking electrode made of aluminum to which voltage for dielectrically polarizing the dielectric plate is applied; a moderation layer made of a composite of silicon carbide and aluminum which is provided between the dielectric plate and the chucking electrode, and has a thermal expansion coefficient between a thermal expansion coefficient of the dielectric plate and a thermal expansion coefficient of the chucking electrode; a covering layer made of a composite of silicon carbide and aluminum which is provided on the chucking electrode at the side opposite to the dielectric plate, and has a thermal expansion coefficient between the thermal expansion coefficient of the dielectric plate and the thermal expansion coefficient of the chucking electrode; a main body made of metal on which the dielectric plate, the moderation layer, the chucking electrode and the covering layer are supported; and screws fixing the chucking electrode to the main body, wherein the chucking electrode is sandwiched by the moderation layer and the covering layer, the dielectric plate and the moderation layer are respectively brazed with brazing material whose main component is indium, the covering layer is inserted between the chucking electrode and the main body, and the screws penetrate the chucking electrode, and do not penetrate either the moderation layer or the covering layer.