Patent ID: 7887684
Filing Date: 2011-02-15
Classification: G01N

Abstract:
1. 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.