Patent ID: 6814572
Filing Date: 2004-11-09
Classification: C23C,F27B,F27D,H01L

Abstract:
A thermal processing unit comprising:a reaction container which an object to be processed is conveyed into and from, a process-gas introducing part for introducing a process gas into the reaction container, a replacement-gas introducing part for introducing a replacement gas into the reaction container, the replacement-gas introducing part being independent of the process-gas introducing part, a discharging part for discharging a gas in the reaction container, and a controlling part connected to the process-gas introducing part, the replacement-gas introducing part and the discharging part, the controlling part being adapted to: control the discharging part so as to lower a pressure in the reaction container with respect to at a thermal process; then control the process-gas introducing part and the replacement-gas introducing part so as to stop introducing the process gas and introduce the replacement gas into the reaction container as well as control the discharging part so as to raise the pressure in the reaction container with respect to at the thermal process; and then control the discharging part so as to lower the pressure in the reaction container with respect to at the thermal process.