Patent ID: 7815740

Claim:
A substrate mounting table for mounting thereon a substrate to be processed while controlling a temperature thereof, which comprises: a plurality of passageways independently provided in the substrate mounting table, a temperature control medium flowing through the passageways; one or more gaps formed at least between two of the passageways; and one or more temperature control units provided in the gaps, wherein the gaps are in a vacuum state or a heat transfer medium-filled state, wherein the temperature control units are heaters electrically connected to a heater power source, respectively, wherein lower portions of the gaps extend upwards from a lower portion of the substrate mounting table in a cylindrical shape, and upper portions of the gaps are enlarged transversely from an upper end of the lower portion, wherein the heaters are installed in the transverse upper portions of the gaps respectively, wherein an upper transverse portion included in the inner gap of the one or more gaps is disc shaped, wherein an upper transverse portion included in the outer gap of the one or more gaps is annular shaped, and wherein each of the inner gap and the outer gap is connected to a heat transfer medium supply source and a vacuum pump at the lower end of their lower portions.