| 摘要 |
A spark plug (100) has a resistor (15) between a center electrode 3 and a metal terminal (13). The resistor (15) contains glass, ceramic powder, an electrically conductive material, and metal. An average of two or more particles of the metal are present in an arbitrary region measuring 300 (μm)×300 (μm) on an arbitrary section of the resistor (15), and the total sectional area of the metal present in the region accounts for less than 1.6% of the region. |
