| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive temperature coefficient thermistor, having a gently changing transient-decay current characteristic which does not increase the element size of the thermistor. SOLUTION: The transient-decay current characteristic of a semiconductor ceramic, which has a positive temperature characteristic of resistance and is used as a thermistor element for demagnetization is changed gently, by adjusting the rate of change of temperature-characteristic-of-resistanceαof the ceramic calculated from the formula to be within the range of 10-17%:α=[ln(ρ2/ρ1)/(T2-T1)]×100(%/ deg.C) whereρ1: the specific resistance value which is 10 times as large as that ofρ25, when the element temperature is adjusted to the room temperature (25 deg.C),ρ2: the specific resistance value which is 100 times as large as that ofρ25, when the element temperature is adjusted to the room temperature (25 deg.C), T1: the element temperature when the resistance value indicatesρ1, and T2: the element temperature when the resistance value indicatesρ2.
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