Patent ID: 6534749
Filing Date: 2003-03-18
Classification: C23C,C30B,F27D,H01L

Abstract:
A heat treatment apparatus comprising:a heat source heating a substrate by irradiating a light on a first surface of the substrate; a support member supporting the substrate so that the first surface of the substrate faces said heat source and a predetermined gap is formed between a surface of said support member and a second surface of the substrate opposite to the first surface; and a temperature measuring device measuring a temperature of the substrate by detecting a light radiated from the second surface of the substrate by at least one light-detecting part facing the second surface of the substrate, wherein the substrate placed on said support member defines a first space on a side of the first surface of the substrate and a second space on a side of the second surface of the substrate, and said predetermined gap is configured and arranged so that an incident rate of a stray light entering the second space from the first space through said predetermined gap and incident on said light-detecting part is equal to or less than a predetermined value, where the incident rate is defined by a ratio of an amount of the stray light incident on said light-detecting part to an amount of light radiated by said heat source.