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：US20210247355A1

公开(公告)日：2021-08-12

申请号：US17172104

申请日：2021-02-10

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407

Abstract: A gas sensor includes a sensor element, a tubular body made of metal, and a sealing material. The sensor element has a surface. The tubular body has a through hole which is formed along the axial direction and through which the sensor element is inserted. The sealing material is placed inside the through hole and between the inner peripheral surface of the through hole and the sensor element. The sealing material covers a part of the surface of the sensor element. When the sensor element is viewed in cross section from a second direction perpendicular to a first direction corresponding to the longitudinal direction of the sensor element, the sealing material forms a first inclination angle of not less than 10° and not more than 80° with respect to the surface.

公开(公告)号：US20210140916A1

公开(公告)日：2021-05-13

申请号：US17093676

申请日：2020-11-10

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407 ,  G01N27/406 ,  G01N33/00 ,  G01N27/409 ,  G01N27/41

Abstract: A gas sensor includes a sensor element, an elastic insulating member, a plurality of lead wires, a plurality of metal terminals, and a ceramic housing. The plurality of lead wires are inserted in the elastic insulating member. The plurality of metal terminals each have a first end electrically connected to the sensor element, and a second end electrically connected to a corresponding one of the plurality of lead wires. The ceramic housing includes a plurality of insertion portions each including a through hole in which a corresponding one of the plurality of metal terminals is inserted, and at least one of the plurality of insertion portions has a different height from other insertion portions.

公开(公告)号：US20160033447A1

公开(公告)日：2016-02-04

申请号：US14800171

申请日：2015-07-15

Applicant: NGK INSULATORS, LTD.

Inventor： Osamu NAKASONE ,  Takayuki SAKURAI ,  Satoshi NISHIKAWA ,  Shotaro NIIZUMA ,  Noriko HIRATA ,  Yuki NAKAYAMA

IPC: G01N27/407 ,  H01B1/02 ,  G01N27/30

CPC classification number: G01N27/4071 ,  G01N27/301 ,  G01N27/4075 ,  G01N27/4076 ,  H01B1/02

Abstract: A sensing electrode for sensing a predetermined gas component of a measurement gas, which is provided in a mixed-potential gas sensor that measures the concentration of the predetermined gas, component, is formed of a cermet containing a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal comprisesPt and Au. An Au abundance ratio, which is an area ratio of a portion covered with Au to a portion at which Pt is exposed in a surface of noble metal particles forming the sensing electrode, is 0.3 or more.

Abstract translation: 用于感测测量气体的预定气体成分的感测电极由测量气体成分浓度的混合电位气体传感器组成，由含有贵金属和氧离子导电的金属陶瓷形成 固体电解质。 贵金属包括Pt和Au。 作为Au覆盖的部分的面积比与在Pt形成感应电极的贵金属粒子的表面露出的部分的面积比为0.3以上的Au丰度比。

公开(公告)号：US20230304963A1

公开(公告)日：2023-09-28

申请号：US18138170

申请日：2023-04-24

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/407 ,  G01N27/409 ,  G01N27/41

CPC classification number: G01N27/4073 ,  G01N27/4071 ,  G01N27/409 ,  G01N27/41 ,  G01N33/0037

Abstract: A gas sensor includes: a laminate formed of a plurality of layers including at least one layer of a solid electrolyte; a reference gas chamber formed in the laminate and containing a reference gas; and a reference electrode partially exposed in the reference gas chamber. A portion which is not exposed in the reference gas chamber, of the reference electrode is sandwiched between, among the layers, a first layer and a second layer adjacent to the first layer. When an area of the portion sandwiched between the first layer and the second layer, of the reference electrode is defined as a first area, and an area of a portion exposed in the reference gas chamber, of the reference electrode is defined as a second area, a ratio of the first area to the second area is 0.3 or more.

公开(公告)号：US20230243775A1

公开(公告)日：2023-08-03

申请号：US18102796

申请日：2023-01-30

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA ,  Toshihiro HIRAKAWA

IPC: G01N27/407

CPC classification number: G01N27/4077 ,  G01N27/4071

Abstract: A gas sensor element capable of preventing a decrease in responsiveness despite a protective layer covering a gas introduction opening is provided. A gas sensor element according to an aspect of the present invention includes an element base having a surface in which a gas introduction opening is open, a protective layer, a buffer layer, and a gas introduction layer that is disposed between the element base and the buffer layer. The gas introduction layer covers the gas introduction opening, is in contact with the protective layer, and has a porosity that is 30% or more and is higher by 5% or more than the porosity of the buffer layer.

公开(公告)号：US20230228702A1

公开(公告)日：2023-07-20

申请号：US18154357

申请日：2023-01-13

Applicant: NGK Insulators, Ltd.

Inventor： Yusuke WATANABE ,  Yasumasa FUJIOKA ,  Yohei GORO ,  Akihiro NAKAJIMA ,  Shotaro NIIZUMA

IPC: G01N27/409 ,  G01N27/41 ,  G01N33/00 ,  G01N27/406

CPC classification number: G01N27/409 ,  G01N27/41 ,  G01N33/0037 ,  G01N27/4067

Abstract: Provided is a gas sensor element capable of realizing highly accurate concentration measurement in both environments where the concentration of a specific gas in a measurement target gas is high and where the concentration is low. A gas sensor according to one aspect of the present invention determines whether the concentration of a predetermined gas component in a measurement target gas is higher or lower than a predetermined concentration. If it is determined that the concentration is lower, a specific temperature that a sensor element is to reach as a result of being heated by a heater unit is set to be lower than the specific temperature set if it is determined that the concentration is higher.

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：US20220317083A1

公开(公告)日：2022-10-06

申请号：US17699896

申请日：2022-03-21

Applicant: NGK Insulators, Ltd.

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

IPC: G01N27/407 ,  G01N27/406

Abstract: Provided is a gas sensor intended to achieve improved measurement accuracy. A gas sensor according to one aspect of the present invention includes: a gas sensor element including a gas introduction opening and a gas exhaust unit; and a protective member including a plurality of porous layers and configured to cover the gas sensor element. The plurality of porous layers include a first porous layer arranged on the innermost side and a second porous layer arranged on an outer side of the first porous layer. The first porous layer has a higher porosity than the second porous layer. The gas introduction opening and the gas exhaust unit are covered by the first porous layer. The protective member includes, between the gas introduction opening and the gas exhaust unit, a restricting portion configured to restrict the flow of gas.