| 摘要 |
PURPOSE:To form a gas diffusing hole of a hole diameter within a desired range at a good yield even if a slight deformation arises at the time of calcination of a solid electrolyte plate which is a sensor element by providing the gas diffusing hole to the solid electrolyte plate. CONSTITUTION:Porous electrodes 12A, 12B consisting of, for example, platinum are formed on both surfaces of the solid electrolyte plate 11 having the ion conductivity of a prescribed gas. The gas diffusing hole 13 is provided to the solid electrolyte plate 11 and a protective cap 14 is placed on the porous elec trode 12A side of the one surface. The solid electrolyte plate 11 and the protec tive cap 14 are sealed therebetween by a sealing material 15 in the peripheral edge part thereof. A gas diffusing space 16 is formed between the protective cap 14 and the porous electrode 12A as well as the solid electrolyte plate 11 by the sealing material 15. Lead wires 17A, 17B are respectively connected to the porous electrodes 12A, 12B. The need for providing the gas diffusing hole to the protective cap 14 is eliminated in this way and since the solid electro lyte plate 11 is as thin as about 1/10 the thickness of the protective cap 14, the plate exerts the less influence on the gas diffusing hole 13 even if there is some deformation at the time of calcination. |
