Patent ID: 9228973
Filing Date: 2016-01-05
CPC Classification: G01N

Claim Text:
1. A gas sensor comprising: a sensor chip including a sensor MISFET and a heater formed at a heater region on a main surface of a substrate; a mounting substrate on which the sensor chip is mounted; and a heat insulation material inserted between the sensor chip and the mounting substrate, wherein, on the main surface of the substrate of the sensor chip, a pad electrode is formed so as to be connected to the heater via a lead-out wiring, a lead terminal used for connection to an outside is formed so as to penetrate through the mounting substrate, and the pad electrode and the lead terminal are connected to each other by a lead wire, wherein the sensor MISFET includes a catalytic metal gate, a source electrode, and a drain electrode, and the heater is arranged on a plane that extends between the source electrode and the drain electrode and has a first portion at one side of the catalytic metal gate and a second portion at an opposite side of the catalytic metal gate and has a gap region between the first portion and the second portion, and the heater is provided at a height position higher than a height position of the catalytic metal gate in a direction perpendicular to the plane on which the heater is arranged, and wherein a thermal resistance obtained from the heater region where the heater is formed to the mounting substrate so as to interpose the sensor chip and the heat insulation material therebetween is represented as “R