Patent ID: 6160342
Filing Date: 2000-12-12
Classification: H01T

Abstract:
A resistor-incorporated spark plug in which a through hole is formed along an axis of an insulator, a terminal is fixed to one end side of the through hole while a center electrode is fixed to the other end side of the through hole, and in which a resistor made of a resistor composition principally comprising a conductive material, glass particles and ceramic particles other than glass is placed between the terminal and the center electrode within the through hole,wherein the resistor composition contains, as the ceramic particles, semiconductive ceramic particles, and(.alpha.2-.alpha.1)/.alpha.1.gtoreq.0.30 wherein a value of electric resistance measured between the terminal and the center electrode via the resistor is .alpha.1 at 20.degree. C. and .alpha.2 at 150.degree. C.