Lamination-type gas sensor element and gas sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsShinya Awano, Keisuke Makino, Yoshiaki Kuroki, Takao Kojima, Masashi Ando
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Abstract
A gas sensor element having an element body, the element body including: a ceramic heater having ceramic layers and a heater element embedded in the ceramic layers; and a solid electrolyte layer including a detection section covered by a pair of electrodes, the solid electrolyte layer being laminated together with the ceramic heater. Furthermore, the element body has a width at a front portion including the detection section smaller than at a rear portion, and at least both side edge faces of the front portion of the element body are covered with a porous layer.
Claims9
A gas sensor element comprising an element body having a front portion including two side faces and a rear portion, the element body including:
- a ceramic heater comprising ceramic layers and a heater element embedded in said ceramic layers;
- and a solid electrolyte layer comprising a detection section, the detection section being covered by a pair of electrodes, and the solid electrolyte layer being laminated with said ceramic heater, wherein
- the front portion of the element body including the detection section has a smaller width than the rear portion of the element body, and at least both side faces of the front portion of said element body are covered with a porous layer,
- said rear portion including a plurality of terminal electrodes on an outer surface thereof, the terminal electrodes being electrically connected to said pair of electrodes and said heater element,
- the element body further includes an intermediate part having opposed side faces provided between said front portion and said rear portion, said intermediate part including an engagement portion and having a width which gradually increases along a length of the element body from the front portion to the rear portion, and said porous layer covers a side edge face of a boundary part between said front part and said intermediate part, and
- the porous layer extends from a tip end of the front portion of the element body to a midway position of the intermediate part so that the engagement portion as well as the rear portion of the element body are not covered by the porous layer, said porous layer being set apart from the engagement portion.
Dependencies are inferred from the claim text.