Patent ID: 11921078
Assignee: NGK INSULATORS, LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The sensor element according to claim 5,
wherein the element body is a layered body including a plurality of layers composed of the solid electrolyte body, the layers being stacked on top of one another in a stacking direction perpendicular to the longitudinal direction,
wherein the surface of the element body includes the end surface and a plurality of adjacent faces that each meet the end surface along a side of the end surface,
wherein the protective layer includes an adjacent-face protective layer that covers the plurality of adjacent faces, and
wherein parts of the adjacent-face protective layer which each cover a specific one of top and bottom surfaces included in the adjacent faces, the top and bottom surfaces being located at respective ends of the element body in the stacking direction, each have an internal space formed therein and include an outer protective layer arranged closer to the outside of the sensor element than the internal space and an inner protective layer arranged closer to the inside of the sensor element than the internal space, the inner protective layer being bonded on the surface of the element body.