Patent ID: 8271124

Claim:
A decompressing type heater having a heat treatment chamber formed with an outlet port, the heater being configured to pre-heat an object placed in the heat treatment chamber to a pre-heating temperature under atmospheric pressure and heat the object to a higher temperature than the pre-heating temperature under lowered pressure, the heater comprising: a heater for heating the object in the heat treatment chamber; a contact temperature measuring part for measuring the temperature of the object in contact relation therewith in the heat treatment chamber; a non-contact temperature measuring part for measuring the temperature of the object in non-contact relation therewith in the heat treatment chamber; and a controlling part for controlling the heater and adjusting the non-contact temperature measuring part, the controlling part being adapted to adjust setting of temperature error of the non-contact temperature measuring part to eliminate a difference of a measured value of the non-contact temperature measuring part with respect to a measured value of the contact temperature measuring part during pre-heating under atmospheric pressure, and to control the heater based on the measured value of the adjusted non-contact temperature measuring part during heat treatment under lowered pressure.