Patent ID: 7250094
Filing Date: 2007-07-31
Classification: C23C,H01L

Abstract:
1. 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 for heating the object mounted on the placement table; and a gas feeding unit for supplying a processing gas in the processing chamber, wherein a supporting surface is formed 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 for discharging the purge gas flowing in the purge gas groove while preventing the processing gas from entering into the purge gas groove is formed around at an outer circumferential portion of the top portion of the cylindrical support column, and a purge gas feeding unit for supplying the purge gas in the purge gas groove is installed, wherein the flow path is a gap between an upper surface of the outer circumferential portion of the cylindrical support column and a lower surface of the placement table facing to the upper surface, and the purge gas groove formed at the intermediate circumferential portion of the top portion of the cylindrical support column is a gap between the outer circumferential portion and the inner circumferential portion of the top portion of the cylindrical support column.