Patent ID: 6322631
Filing Date: 2001-11-27
Classification: H01L

Abstract:
An apparatus for heat-treating a processed body, while supplying a processing gas, by use of the apparatus having a reaction vessel enclosed by a heating furnace; a shift and mount chamber disposed on a lower side of the reaction vessel, for shifting and mounting the processed body; a processed body holding member moved up and down between the reaction vessel and the shift and mount chamber, for holding the processed body; and an exhaust passage connected to the reaction vessel, which comprises:a pressure adjusting valve disposed in the exhaust passage;means for detecting a difference in pressure between a reaction vessel side and a downstream side of said pressure adjusting valve in the exhaust passage; andcontrol means for controlling opening rate of said pressure adjusting valve in such a way that the pressure on the reaction vessel side is higher than that on the downstream side, on the basis of the pressure difference obtained by said detecting means.