| 摘要 |
PURPOSE:To desiccate absorbed moisture of heat sensitive resin in early stage of current application by connecting an end of a heat generating line and an end of a temperature detecting line with a thermoelectric conversion element and controlling temperature detecting current corresponding to the temperature of a heat sensitive resin. CONSTITUTION:A heat generating line 2 and a temperature detecting line 3 are provided separately on the heat sensitive resin film 1 of a heat sensitive heating unit A, and when a contact S is closed, current flows from a commercial power source 7 to the heat generating line 2 and heat is generated. When impedance of the heat sensitive resin film 1 is lowered by rise of temperature, current flows to a detection resistance R1 from the heat generating line 2 through the temperature detecting line 3 and a thermoelectric conversion element Th. Accordingly, a switching circuit B operates and makes the contact S off. When the heat sensitive resin film absorbs moisture, rise of temperature is low, and accordingly, the thermoelectric conversion element Th keeps large resistance value, and the switching circuit B does not operate until temperature rises sufficiently.
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