Patent ID: 9733208
Date: 2017-08-15
CPC Classifications: G01N

Claim:
1. A gas sensor, comprising: a sensor element made of a solid electrolyte and having a cylindrical portion arranged coaxially with an axis of the sensor element, a front end portion closing a front end of the cylindrical portion, and a connection region connecting the cylindrical portion and the front end portion; and a heater formed into either a cylindrical shape or a columnar shape and located inside the sensor element so as to heat the sensor element by heat generation thereof; wherein the heater has a front end portion and a lateral portion which meets the front end portion at an interface between the front end portion and the lateral portion; wherein the front end portion of the heater is in contact with an inner surface of the front end portion of the sensor element; wherein the lateral portion of the heater that is to the rear of the interface is in contact with an inner circumferential surface of the cylindrical portion of the sensor element; and wherein a chamfered portion is formed on a front end edge of the heater and kept from contact with the inner surface of the front end portion and the connection region of the sensor element.