Patent ID: 7860585
Filing Date: 2010-12-28
Classification: G05D,H01L

Abstract:
1. A heat processing apparatus comprising: a reaction vessel configured to contain a processing region and an object to be processed; a heating unit disposed in the reaction vessel and configured to heat the processing region; a temperature detection part configured to detect a temperature of the processing region that is heated by the heating unit; and a control part configured to control the heating unit by a PID control; wherein the control part includes: a rule table that is prepared such that predicted change amounts of a temperature property item when a temperature of the processing region is increased up to a target value, and change ratios of PID constants are correspondingly related to each other; a performance unit configured to repeatedly perform: a step of, after setting the PID constants, obtaining a temperature profile based on a temperature detected value of the temperature detection part, while increasing the temperature of the processing region up to a target temperature by the heating unit, and calculating a difference between an actually measured value and a target value of the temperature property item based on the temperature profile; and a step of, when the difference is over an allowable range and larger than a prescribed value, referring to the rule table and changing the PID constants to reset new PID constants by a change ratio corresponding to an predicted change amount of the temperature property item relative to the difference; until the difference can fall within the allowable range; and an updating unit configured to update, when there is a difference between an actually measured change amount of the temperature property item that has been changed by changing the PID constants with reference to the rule table and a predicted change amount of the temperature property item that has been predicted in a preceding cycle, the corresponding relationship between the PID constants and the predicted change amounts of the temperature property item described in the rule table, based on the actually measured change amount.