Ngk Spark Plug Company, Limited

Sigehiro Otsuka

Takeshi Mitsuoka

Kuniharu Tanaka

Satoshi Teramoto

Masaki Onkawa

Toru Iwano

A gas sensor element () includes a laminate of a detection element () and a heater (), and a porous protection layer () covering a forward end portion thereof. The laminate has a measuring chamber () into which a gas-to-be-measured is introduced via a diffusion resistor (). The porous protection layer includes an inner porous layer (), and an outer porous layer (). The inner porous layer has a higher porosity than the outer porous layer and the diffusion resistor. As viewed in a plurality of 100 &#x3bc;m&#xd7;100 &#x3bc;m regions ato aand bto bon sections of the inner porous layer and the diffusion resistor, respectively, a pore diameter greater than the greatest pore diameter Cin the regions of the diffusion resistor exists in each of the regions of the inner porous layer.

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Gifu, Japan

Sigehiro Otsuka