| 摘要 |
PROBLEM TO BE SOLVED: To provide constitution and structure of an external charging device, capable of easily giving a temperature difference to a thermal power generating timepiece at a low cost, when charging the timepiece by adding heat from the outside. SOLUTION: A semiconductor, whose resistance value is increased as a rise temperature, and sharply increased at the Curie temperature or above, is used as a heating means of the external charging device for a thermal power generating instrument which generates power using the temperature difference. Particularly, a PTC thermistor having the Curie heater temperature of 30 deg.C to 60 deg.C is used. Further, natural air-cooling or a blower fan is used as its cooling means.
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