Patent ID: 8150243

Claim:
A heating process apparatus comprising: a process chamber; a heat-processed object support member provided in the process chamber for heating a substrate disposed thereon; a cap for covering the substrate disposed on the heat-processed object support member; a heater for heating the heat-processed object support member; temperature measuring means for measuring the temperature of the heat-processed object support member; and control means, responsive to the temperature measured by the temperature measuring means, for controlling the heater, wherein the temperature measuring means comprises a first temperature measuring unit and second temperature measuring unit which are respectively provided outside infrared ray energy-transmissive windows at an upper part and a side part of a peripheral wall of the process chamber, each of the first and second temperature measuring units comprises a collector collecting infrared energy radiated from the heat-processed object support member and a calculating unit calculating temperature based on the ratio between the intensities of two wavelengths in the infrared ray, the first measuring unit provided at the upper part of the peripheral wall of the process chamber measures a temperature of the cap, and the control means, in response to the temperature of the cap measured by the first measuring unit, controls the heater so as to set the cap temperature to a predetermined temperature, and the second measuring unit, provided at the side part of the peripheral wall of the process chamber, measures a temperature of the heat-processed object support member, and the control means, in response to the temperature of the heat-processed object support member measured by the second measuring unit, turns off the heater when the temperature of the heat-processed object support member exceeds an over-heat critical temperature.