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摘要

PURPOSE:To improve magnification of a utilization area, temperature conformity, responsiveness durability by coating heater electrodes with a conductive mediation metal an forming the end parts of lead wires being connected with the mediation metal by a conductive soldering metal. CONSTITUTION:Meandering heater patterns 2 consisting of a tungsten sintered body of high electric resistance buried in the peripheral inside of cylindrical ceramics body 1 are formed, and heater electrodes 3 to be formed on both ends of the heater patterns 2 are formed on one side of the ceramics body 1 of the same metal with the heater patterns 2 and these heater electrodes 3 are facing one the outside. Then, end parts 5' of the lead wires 6 are surely adhered on the conductive mediation metal to be coated on these heater electrodes 3, that is, on the mediation metal 4 of a nickel-plated layer through a soldering metal 5 such as silver solder. Thereby, magnification of a utilization area, durability, responsiveness and temperature conformity can be improved.