Ngk Spark Plug Company, Limited

Syun Sakuma

Masaki Mizutani

Nobuo Furuta

Masaki Onkawa

Yuta Oishi

A gas sensor element includes a laminate formed of a detecting element section and a heater section, and a porous protection layer covering a forward end portion of the laminate. The detecting element section has one or more cells having a solid electrolyte body and a pair of electrodes. The heater section has a heater. Side surfaces of the solid electrolyte bodies in parallel with the direction of lamination are covered with dense insulating members. The cell-to-be-controlled is temperature controlled by the heater to 600&#xb0; C. to 830&#xb0; C. The porous protection layer is formed on the laminate from a forward end portion to a region which has a temperature of 500&#xb0; C. or higher when the temperature control is performed, and the porous protection layer is not formed in a region which has a temperature of 300&#xb0; C. or lower when the temperature control is performed.

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Inuyama, Japan

Syun Sakuma