| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem wherein a responsiveness is decreased when a catalyst layer is formed on the surface of a sensor element to improve the detection accuracy of an air-fuel ratio sensor. <P>SOLUTION: This air-fuel ratio sensor comprises: a solid electrolyte 12 having a first surface 12a on which sensor element section 11 faces the atmosphere side and a second surface 12b on which it faces the exhaust side; an atmosphere-side electrode 14 arranged on the first surface 12a of the solid electrolyte 12; an exhaust side electrode 15 arranged on the second surface 12b so as to face the atmosphere-side electrode 14 with respect to the solid electrolyte 12; a diffusion resistive layer 16 formed so as to cover exhaust side electrode 15 and the second surface 12b of the solid electrolyte 12; and a catalyst layer 18 formed on the surface of the diffusion resistive layer 16 except for a region 16c for introducing exhaust air to the exhaust side electrode 15 via the diffusion resistive layer 16. <P>COPYRIGHT: (C)2009,JPO&INPIT |
