Patent ID: 8003919

Claim:
A substrate heat treatment apparatus for heat-treating a substrate, comprising: a heat-treating plate; support devices projecting from an upper surface of said heat-treating plate for contacting and supporting a lower surface of the substrate, said support devices being located at apexes of equilateral triangles arranged regularly and continually on said upper surface; a seal device disposed annularly on the upper surface of said heat-treating plate for contacting an edge region of the substrate to render gastight a space formed between the substrate and said heat-treating plate; and exhaust bores for exhausting gas from said space; wherein said substrate is circular and 300 mm in diameter; said space has an inner pressure reduced to —4kPa or above and less than 0Pa by exhaust through said exhaust bores; and said support devices are arranged at intervals of 35 to 40 mm inclusive.