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1. (WO2018016280) GAS SENSOR

Pub. No.:    WO/2018/016280    International Application No.:    PCT/JP2017/023714
Publication Date: Fri Jan 26 00:59:59 CET 2018 International Filing Date: Thu Jun 29 01:59:59 CEST 2017
IPC: G01N 27/12
Applicants: NGK SPARK PLUG CO., LTD.
Inventors: YOKOYAMA Takahiro
横山 崇広
西山 寛幸
The purpose of the invention is to provide a gas sensor that makes the structure for connecting a ceramic circuit board having a sensor element fixed thereto and an external circuit compact, saves space, and achieves a reliable electrical connection. Provided is a gas sensor 1 provided with a ceramic circuit board 50 having an opening 50h formed therein and a sensor element 40 that is suspended and fixed within the opening by conductive members 61, 63, wherein: while a distal end part 50a of the ceramic circuit board is accommodated within a casing 10, 20, a proximal end part 50e of the ceramic circuit board extends to the outside of the casing; conductive pad parts 50p that are connected with the conductive members via lead parts 50L are disposed on the front and back surfaces of the proximal end part; the width W1 of the distal end part 50a is wider than the width W2 of a narrow width region 50R of the proximal end part 50e that includes the conductive pad parts 50p and portions of the lead parts 50L; and the gas sensor is provided with a cylindrical insulator 71 that surrounds the periphery of the narrow width region 50R, and a plurality of spring terminals 79 that are accommodated in the insulator and elastically come into contact with the respective conductive pad parts.