| 摘要 |
PURPOSE:To detect oxygen concentration stably for a long period by rubbing a connecting surface between a spacer and a solid electrolyte and forming an adhesion surface, and clamping a substrate and the base-end side of the solid electrolyte integrally by a fixing member. CONSTITUTION:The connecting surface between the solid electrolyte 47 and spacer 51 which constitute an oxygen sensor 50 is polished to form the adhesion surface 60. Then, a sensor element part 21 formed by laminating the spacer 51 and oxygen pump part 50 on the adhesion surface 60 is held by a holder 25 at its intermediate part through two washers 22 and 23 and a glass layer 24. A protector 26 having a slit 26a is fitted onto the outer periphery of the tip of the hole 25 while covering the tip part of the sensor element part 21, and the outer base-end outer periphery of the holder 25 is fitted and held in a cylindrical outer cap 27. Consequently, the need to use an adhesive is eliminated, the degree of freedom to thermal expansion is increased, and the substrate 42 and solid electrolyte 47 are prevented from cracking while the sealing property of a gap part is secured. |
