| 摘要 |
PURPOSE:To aim at stabilizing electric characteristics and improving durability to thermal and mechanical shock by fixing a heater element to an insulation base plate consisting of a metal base plate and an electric insulation layer including at least enamel glass and synthetic mica by means of a heater coating layer. CONSTITUTION:A heater element 2 and part of a terminal plate 3 connected with it are fixed at an insulation base plate 1 consisting of a metal base plate 1a and an electric insulation layer 1b including at least enamel glass and synthetic mica by means of a coating layer 4. For the base plate 1, preprocessing for enamel such as Ni processing is applied to the metal base plate 1a using steel plate for enamel, and a properly adjusted slip including enamel glass and synthetic mica is applied, dried and baked, so an electric insulation layer 1b is formed. Electric characteristics are stabilized by this, and durability to thermal and mechanical shock can be improved.
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