Patent ID: 7835816

Claim:
A heat processing apparatus, comprising: a reaction vessel including a furnace port; a heating means provided around the reaction vessel; a substrate holding tool adapted to hold a plurality of substrates in parallel to one another; a processing gas introduction means for introducing a processing gas into the reaction vessel and providing a heating process to the substrates; an external temperature detecting section provided outside the reaction vessel; a power source for supplying power to the heating means; and a control section for controlling the power source, wherein the control section includes: a prediction means for predicting an inner wall temperature of the reaction vessel, based on a command value of power to be supplied to the heating means; a power control means for controlling the power to be supplied to the heating means, based on a temperature detection value detected by the external temperature detecting section and the inner wall temperature predicted by the prediction means; and wherein the power control means includes a power command value operation section adapted to execute a first step of calculating the command value of the power to be supplied to the heating means, by using a prediction value y d of the inner wall temperature, as a main object to be controlled, during an initial time of loading to carry the substrate holding tool into the reaction vessel, and a second step of calculating the command value of the power to be supplied to the heating means, by using a detection value y m of the external temperature detecting section, as a main object to be controlled, during an end time of the loading.