| 摘要 |
PROBLEM TO BE SOLVED: To reduce influence of thermal deformation and the like by pressing a reference electrode and a detection electrode to an ionic conductor abutting on both the electrodes by use of an elastic force of an elastic body. SOLUTION: In this gas sensor element, a panel heater 12 is placed on a heat insulating material 5 placed on a holding plate 6, while a solid electrolyte 11, i.e., an ionic conductor, is placed on the panel heater 12. A reference electrode 9 and a detection electrode 10 are disposed on the solid electrolyte 11, while a heat insulating material 2 is placed on a ceramic plate 8 placed on both the electrodes 9, 10. An end part of a reverse J-shaped element pressing rod 7 for applying a downward pressing force is abutted on the heat insulating material 2. An end part of a long side of the element pressing rod 7 penetrates through the holding plate 6 to project outside, while the downward pressing force is applied to the element pressing rod 7 by a coil spring 13 provided around the projecting part. Thereby, an end of a short side of the element pressing rod 7 presses the reference electrode 9 and the detection electrode 10 to the solid electrolyte 11 through the heat insulating material 2 by the energizing force of the coil spring 13. Accordingly, when the gas sensor element is operated by heating, influence of thermal expansion of respective components in respective longitudinal and lateral directions can be sufficiently reduced. |
