| 摘要 |
PROBLEM TO BE SOLVED: To provide an oxygen sensor which can reduce activation time without damaging a structure. SOLUTION: A cylindrical base 111 formed from ZrO2 and having a closed end is provided with a projecting part 111a by cutting work or the like, and an electric heater 117 is directly installed on the upper surface of the projecting part 111a via an insulator 116. Therefore, not only the base and inside and outside electrodes 112, 113 provided respectively on the inner and outer surfaces of the base, but also exhaust gas passing through a coating layer 115 and a frame-sprayed layer 114 and making contact with an external electrode are heated by the electric heater, resulting in reduced activation time. Further, since the insulator and the base are almost equal in heat conductivity, cracking between them is also prevented. |
