| 摘要 |
PROBLEM TO BE SOLVED: To provide means for making satisfactory PTC characteristics and high electrification durability compatible in an inorganic PTC thermistor member in which conductive particles are dispersed in a thermally expansible host phase.SOLUTION: A PTC thermistor member is divided into two kinds and structured of a first PTC thermistor member 1 constituting a central part and a second PTC thermistor member 2 constituting a surface part. The structure depends on either a method of improving a strength by making an average particle size of second conductive particles constituting the second PTC thermistor member smaller than a particle size of conductive particles constituting the first PTC thermistor member or a method of reducing an inside/outside temperature difference by setting resistivity of the second PTC thermistor member higher than that of the first PTC thermistor member. |
