| 摘要 |
PURPOSE: To provide a cooker having a positive temperature characteristic by applying the constitution that a conductive film contains a binder of polyimide resin and a conductive inorganic substance having the specified grain size according to the preset ratio. CONSTITUTION: A cooker 10 has a pair of electrodes 2 at both ends of a flat insulation substrate 3, and a conductive film 1 containing a conductive material and a binder is laid between the electrodes 2. The conductive film 1 formed on the substrate 3 contains a binder at least made of polyimide resin, and metallic powder or silicide with a grain size between 1 and 20μm on the basis of a blending ratio between 1:1 and 1:6. As a result, the film 1 comes to have a positive temperature characteristic, and even if the temperature of cooking surface drops, due to the placement of a cooking ingredient thereon, power consumption becomes high and the temperature thereof quickly rises. Furthermore, power consumption becomes low, when temperature reaches the preset level. Also, when the film 1 is made to contain an insulation filler having a mean grain size equal to or less than 10μm, the resistance value of the film 1 increases, and a resistance value for a heating film can be easily established.
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