Patent ID: 9418881
Filing Date: 2016-08-16
CPC Classification: C23C,G05D,H01L

Claim Text:
1. A substrate processing apparatus comprising: a heater configured to heat a process chamber wherein a substrate is accommodated; an inner tube defining the process chamber and an outer tube installed between the inner tube and the heater; an internal temperature sensor installed between the inner tube and the outer tube and configured to detect a temperature about the substrate; an external temperature sensor installed between the outer tube and the heater and configured to detect a temperature about the heater; and a control unit configured to control the heater by switching between a first control mode, a second control mode and a third control mode, wherein the control unit is configured to control the heater based on temperature detected by only the external temperature sensor in the first control mode, the control unit is configured to control the heater based on temperatures detected by both the internal temperature sensor and the external temperature sensor in the second mode, and the control unit is configured to control the heater using neither the internal temperature sensor nor the external temperature sensor in the third control mode, and the control unit is configured to switch from the first mode to the second mode when the temperature detected by the external temperature sensor reaches a first threshold temperature, and to switch from the second mode to the first mode when the temperature detected by the external temperature sensor reaches a second threshold temperature lower than the first threshold temperature, and wherein a heat resistance of the internal temperature sensor is greater than that of the external temperature sensor, and a temperature detection performance of the external temperature sensor is higher than that of the internal temperature sensor.