| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas sensor capable of preventing detachment of a measurement object gas side lead part. <P>SOLUTION: This gas sensor 1 has a gas sensor element 2 which detects specific gas concentration in measured object gas, an insulator 3 which inserts/holds the gas sensor element 2, and a housing 4 which holds the insulator 3 in the inside. The gas sensor element 2 has a solid electrolyte object 21 having oxygen ion conductivity, a measured object gas side electrode 221 and a measured object gas side lead part 222, which are formed on one side of the solid electrolyte object 21, a standard gas side electrode 231 formed on the other side of the solid electrolyte object 21; a dense protective layer 24 laminated on the solid electrolyte object 21 so as to cover the measured gas object side lead part 222; and a porous protective layer 25, laminated on the dense protective layer 24 so as to cover the measured gas object side electrode 221. The deviation amount of the dense protective layer 24 to a base end side of the porous protective layer 25 is 5mm or smaller. The base end part 251 of the porous protective layer 25 is arranged closer to the base end side than to the tip part 31 of the insulator 3. <P>COPYRIGHT: (C)2008,JPO&INPIT |
