Patent ID: 7769279

Claim:
A heat treatment apparatus, comprising: an evacuatable processing chamber; a cylindrical support column extending upward from a bottom portion of the processing chamber; a placement table of a plate shape, supported on a top end of the support column, for mounting an object to be processed thereon; a heating lamp that heats the object mounted on the placement table; and a gas feeding unit that supplies a processing gas in the processing chamber, wherein a supporting surface extends in a circumferential direction at an inner circumferential portion of a top portion of the cylindrical support column to support a lower surface of a circumferential portion of the placement table in contact therewith, a purge gas groove for flowing a purge gas therein is formed in a circumferential direction at an intermediate circumferential portion of the top portion of the cylindrical support column, a flow path that discharges the purge gas flowing in the purge gas groove while preventing the processing gas from entering into the purge gas groove is disposed around an outer circumferential portion of the cylindrical support column, and a purge gas feeding unit that supplies the purge gas in the purge gas groove is installed.