GAS SENSOR ELEMENT, ITS MANUFACTURING METHOD AND GAS SENSOR INCLUDING THE GAS SENSOR ELEMENT

摘要

A gas sensor element includes a cup-shaped solid electrolyte body having closed and open ends, a reference electrode provided on an inner surface of the solid electrolyte body, and a measurement electrode provided on an outer surface of the solid electrolyte body. The reference electrode has a detection portion located closer to the closed end than to the open end of the solid electrolyte body, a terminal portion located closer to the open end than to the closed end of the solid electrode body, and a lead portion connecting the detection and terminal portions. Moreover, the reference electrode has a first thickness in a large-thickness region and a second thickness smaller than the first thickness in a small-thickness region. The large-thickness region includes at least part of the detection portion of the reference electrode, and the small-thickness region includes at least the lead and terminal portions of the reference electrode.

主权项

1. A gas sensor element comprising:
a cup-shaped solid electrolyte body having a closed end on a distal side and an open end on a proximal side in an axial direction of the solid electrolyte body; a reference electrode provided on an inner surface of the solid electrolyte body; and a measurement electrode provided on an outer surface of the solid electrolyte body, wherein the gas sensor element has a detection portion of a predetermined extent located closer to the closed end than to the open end of the solid electrolyte body, the detection portion of the gas sensor element is comprised of a detection portion of the measurement electrode to be exposed to a measurement gas, a detection portion of the reference electrode to be exposed to a reference gas, and a portion of the solid electrolyte body interposed between the detection portions of the measurement and reference electrodes, the measurement electrode further has a terminal portion located closer to the open end than to the closed end of the solid electrode body and a lead portion connecting the detection and terminal portions of the measurement electrode, and the reference electrode further has a terminal portion located closer to the open end than to the closed end of the solid electrode body and a lead portion connecting the detection and terminal portions of the reference electrode, characterized in that the reference electrode has a first thickness in a large-thickness region and a second thickness smaller than the first thickness in a small-thickness region, the large-thickness region includes at least part of the detection portion of the reference electrode, and the small-thickness region includes at least the lead and terminal portions of the reference electrode.