DEFROSTING APPARATUS

摘要

The appts. employs a heater which possesses the function of selftemperature control. It also includes a heating element in the form of a mixture of a conductive material such as carbon and an organic material such as high-density polyethylene whose operating temperature lies within the range of 30 to 110 degrees centrigrade. It employs a ceramic heater which exhibits a positive temperature coefficient of resistance and in which the temperature coefficient of resistance changes sharply at a specific temperature. Such a heater is used as the defrosting heater, and the sharp change of its temperature coefficient of resistance is utilized to detect complete removal of frost.