Ngk Spark Plug Company, Limited

Shohei Yoshiyasu

Yuichi Yamada

Shigeki Mori

Masaki Mizutani

Yoshiaki Matsubara

Shun Sakuma

Makoto Hirasawa

Makoto Shimoide

Hirotaka Tsukamatsu

A gas sensor including a plate-shaped detecting element is disclosed, wherein the detecting element has a pair of principle surfaces and a pair of side surfaces adjacent to the pair of principle surfaces, in a radical direction thereof, wherein a first chamfered portion is provided between at least one first principal surface of the pair of principal surfaces and the rear end surface of the detecting element, and wherein the angle between a first axis ridgeline portion formed by the first principal surface and a first side surface that is one of the pair of side surfaces and extending in the direction of the axis, and a first width ridgeline formed by the first principal surface and the first chamfered portion and extending in a width direction is larger than 90&#xb0;.

Gas sensor

An oxygen sensorincludes an oxygen detection element, which assumes a hollow tubular shape extending along the axis. The oxygen detection elementhas a closed tip end and an opened rear end. An internal electrode layeris formed on an inner circumferential surfaceof the oxygen detection element. The sensoralso has a terminal memberwhich is in contact with the internal electrode layerand in electrical connection therewith. The terminal memberhas press contact portionsandwhich come into press contact with the inner circumferential surfaceof the oxygen detection elementto hold the terminal memberin the oxygen detection element, and conduction portionswhich come into press contact with the internal electrode layeron the inner circumferential surfaceof the oxygen detection elementand into electrical connection with the internal electrode layer. Pressing force per unit area at the conduction portionsis smaller than that at the press contact portionsand

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Komaki, Japan

Shohei Yoshiyasu