| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceramic heater having a stable resistance temperature coefficient, and in result, capable of a steady ignition detection when an integrated ceramic heater with a ceramic heater having a stable resistance value and flame detection is used for a long period. SOLUTION: In a ceramic heater burying a heating resistance element made of a high melting-point metal or its conductive ceramics in a silicon nitride ceramic, and a lead part to supply power to the heater resistance element, variation of the resistance temperature coefficient of the heating resistive element is controlled not to exceed 25%. COPYRIGHT: (C)2003,JPO
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