Patent ID: 7504012

Claim:
A laminated gas sensor element comprising: a diffusion resistance layer; a gas impermeable layer affixed to a major surface of said diffusion resistance layer; a measurement gas chamber into which a gas to be measured is introduced through said diffusion resistance layer; an oxygen ion conductive solid electrolyte member; a measurement gas electrode affixed to said solid electrolyte member, said measurement gas electrode being exposed to the gas within the measurement gas chamber for measuring an oxygen gas component contained in the gas; a reference gas electrode affixed to said solid electrolyte member, said reference gas electrode being exposed to a reference gas, working as an electrochemical cell together with said measurement gas electrode; and a heater which heats the gas sensor element up to a temperature required to activate the gas sensor element, said heater working to increase a temperature of the gas sensor element at a rate of 100 to 250° C./sec, wherein said measurement gas chamber has a volume of 0.15 mm 3 or less, and wherein said measurement gas chamber has a height of 5 to 18 μm in a thickness-wise direction of the gas sensor element.