| 摘要 |
A ceramic glow pug has a structure in which a portion of an embedded resistor is exposed on a portion of a substrate and forms an exposed surface of an electrode taking-out portion. The breakage resistance in the vicinity of the electrode taking-out portion is improved without causing a resistor failure at the electrode taking-out portion. The resistor formed of an electrically conductive ceramic is embedded in the substrate formed of an electrically insulating ceramic, and a portion of the resistor is exposed on the surface of the substrate and has an exposed surface. The exposed surface and the embedded portion differ in stress acting on the substrate, which may decrease the breakage resistance in the vicinity of the electrode taking-out portion. The present invention solves that problem by determining the shape of the exposed surface such that each of the dimension in the axial direction and the dimension in the circumferential direction falls within a range of 1.0 mm to 1.8 mm. |
