Patent ID: 11940405
Assignee: NITERRA CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  B  C  Y | IPC B  C  G

Claim 13:
14. A method for manufacturing the sensor element having the laminate structure as claimed in claim 1, and extending in the axial direction, the method comprising:
laminating a third ceramic green sheet having the hollow space formed therein, on a first ceramic green sheet;
charging a burning-off material into the hollow space;
laminating a second ceramic green sheet on the third ceramic green sheet to form a laminate of the first ceramic green sheet, the third ceramic green sheet, and the second ceramic green sheet; and
firing the laminate to burn off the burning-off material, thereby manufacturing the sensor element which includes the first ceramic layer, the second ceramic layer, and the third ceramic layer corresponding to the first, second, and third ceramic green sheets and which includes, as the internal space, the hollow space surrounded by the first ceramic layer, the second ceramic layer, and the third ceramic layer;
wherein before the third ceramic green sheet is laminated on the first ceramic green sheet, at a periphery of the internal space, a fourth paste or sheet that contains a fourth ceramic containing as a main component a ceramic material different from a ceramic material contained as a main component in the first ceramic green sheet and the third ceramic green sheet is disposed in a region between the first ceramic green sheet and the third ceramic green sheet which are in contact with the burning-off material,
wherein firing the fourth paste or sheet forms the fourth ceramic layer,
wherein the fourth ceramic layer is porous and has air permeability,
wherein, at the periphery of the internal space, a fifth paste or sheet that contains a fifth ceramic containing as a main component a ceramic material different from the ceramic material contained as the main component in the second ceramic green sheet and the third ceramic green sheet is disposed between the second ceramic green sheet and the third ceramic green sheet which are in contact with the burning-off material, followed by the firing step, and
wherein firing the fifth paste or sheet forms the fifth ceramic layer.