Patent ID: 7135659
Filing Date: 2006-11-14
Classification: H01L

Abstract:
1. A heat treatment method for performing a heat treatment by heating an inside of a reaction vessel using a heating unit provided outside said reaction vessel, an object-to-be-treated being positioned inside said reaction vessel, and by introducing a processing gas into said reaction vessel, the method comprising: interpolating a detected external temperature value of the reaction vessel and a detected internal temperature value of the reaction vessel at a predetermined ratio to obtain a first output value for external temperature control on the basis of the deviation between the interpolated value and a preset temperature value; calculating the deviation between the detected internal temperature value and the preset temperature value, and comparing the calculated deviation to the detected external temperature value to obtain a second output value for a cascade control; and linear-interpolating said first output value and said second output value to output the interpolated value as a control signal to the heat release value of the heating unit.