公开(公告)号：US20230098074A1

公开(公告)日：2023-03-30

申请号：US17882907

申请日：2022-08-08

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Toshihiro HIRAKAWA ,  Kirari TAKAHASHI

IPC: G01N27/407

Abstract: Provided is a gas sensor element that can be used for relatively long period of time without leading to a problem even in a harsh usage environment. A gas sensor element according to one aspect of the present invention includes a laminate in which an internal space is provided, and a first porous layer arranged so as to face the internal space. The first porous layer is in contact with the first solid electrolyte layer and a side face of the spacer layer that faces the internal space, and has a porosity or 10% or more and 50% or less.

公开(公告)号：US20230314363A1

公开(公告)日：2023-10-05

申请号：US18185607

申请日：2023-03-17

Applicant: NGK INSULATORS, LTD.

Inventor： Shotaro NIIZUMA ,  Yusuke WATANABE ,  Toshihiro HIRAKAWA ,  Kirari TAKAHASHI

IPC: G01N27/407

CPC classification number: G01N27/4077

Abstract: A sensor element includes: an element body that includes a base part in an elongated plate shape and a measurement-object gas flow part; and a porous protective layer that is formed from one end and covers at least a part in the longitudinal direction of a surface of the element body. The protective layer include: an inner layer; and an outer layer covering the inner layer and a region where the inner layer is not formed. On one principal surface in a region where the inner layer is formed, a first space exists in at least a part between the inner and outer layers, and on the one principal surface in a region where the inner layer is not formed on the one principal surface on which the first space exists, a second space exists in at least a part between the one principal surface and the outer layer.

公开(公告)号：US20230112530A1

公开(公告)日：2023-04-13

申请号：US17882910

申请日：2022-08-08

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Kirari TAKAHASHI ,  Toshihiro HIRAKAWA

IPC: G01N27/41 ,  G01N27/406 ,  G01N27/407

Abstract: In order to suppress a deterioration in the measurement precision while also reducing the manufacturing cost of a gas sensor element, an aspect of the present invention is directed to a gas sensor element including: a stack formed by stacking a plurality of oxygen ion-conductive solid electrolyte layers, and including an internal space configured to receive a measurement target gas from the outside, a first face adjacent to the internal space, and a second face adjacent to an external space; a first pump electrode provided on the first face; a second pump electrode provided on the second face; a first lead formed on the first face so as to extend from the first pump electrode; and a second lead formed on the second face so as to extend from the second pump electrode and configured to be electrically connected to the first lead. At least one of the first and second leads has a shape with a maximum current density of 3.5 A/mm2 or less.

公开(公告)号：US20230091237A1

公开(公告)日：2023-03-23

申请号：US17948475

申请日：2022-09-20

Applicant: NGK INSULATORS, LTD.

Inventor： Shotaro NIIZUMA ,  Yusuke WATANABE ,  Toshihiro HIRAKAWA ,  Kirari TAKAHASHI

IPC: G01N33/00

Abstract: A sensor element for detecting a specific gas concentration in a measurement-object gas includes: an element body provided with a measurement-object gas flow section therein, the measurement-object gas flow section introducing the measurement-object gas and causing the measurement-object gas to flow therethrough; a reference electrode disposed inside the element body; and a reference-gas introduction section that causes a reference gas to flow to the reference electrode, wherein the reference-gas introduction section has a reference-gas flow path, and one or more preliminary chambers which are disposed in a middle of the reference-gas flow path, and have a diffusion resistance lower than a diffusion resistance of the reference-gas flow path, and at least part of the reference-gas flow path is composed of a porous body so that any of the one or more preliminary chambers does not directly communicate with an outside of the element body.

公开(公告)号：US20220316985A1

公开(公告)日：2022-10-06

申请号：US17699836

申请日：2022-03-21

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Hayami AOTA ,  Toshihiro HIRAKAWA ,  Kirari TAKAHASHI

IPC: G01M15/10 ,  F01N13/00

Abstract: The probability of a heater portion of a sensor element being exposed to water is lowered. The sensor element includes a built-in heater that extends in a longitudinal direction and a surrounding housing extending in the longitudinal direction. The heater includes a heat generation portion and a lead portion. The heat generation portion has a front end and a rear end, and is positioned on the same side as a front end portion side of the sensor element. The housing includes an enlarged diameter portion having a diameter of an inner wall that increases in a direction toward the front end of the sensor. The enlarged diameter portion includes a front end portion and a rear end portion. The rear end of the heat generation portion is located closer to the front end of the sensor than the rear end portion of the enlarged diameter portion is.