公开(公告)号：US20220113277A1

公开(公告)日：2022-04-14

申请号：US17497012

申请日：2021-10-08

Applicant: NGK INSULATORS, LTD.

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

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

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：US20210080421A1

公开(公告)日：2021-03-18

申请号：US17022184

申请日：2020-09-16

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/406 ,  G01N27/407

Abstract: A gas sensor includes: a sensor element; a plurality of element pads formed on a rear end portion of the sensor element; and a plurality of contact members holding the rear end portion of the sensor element and electrically connected respectively to the plurality of element pads. At least one contact member of the plurality of contact members has an end portion having a smaller width Wt than the other contact members.

公开(公告)号：US20210063342A1

公开(公告)日：2021-03-04

申请号：US17002942

申请日：2020-08-26

Applicant: NGK INSULATORS, LTD.

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

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

Abstract: A gas sensor includes: a sensor element; a ceramic housing holding a rear end portion of the sensor element and provided with metal terminals electrically connected to the sensor element; and an elastic insulating member that is fixed in the rear of the sensor element and into which a plurality of lead wires electrically connected to the metal terminals are inserted. The elastic insulating member has one or more common spaces formed in a surface of the elastic insulating member that faces the ceramic housing. Two or more of the lead wires are arranged in each common space.

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：US20230228703A1

公开(公告)日：2023-07-20

申请号：US18154370

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 ,  G01N27/406 ,  G01N33/00 ,  G01N27/30

CPC classification number: G01N27/409 ,  G01N27/41 ,  G01N27/4067 ,  G01N33/0037 ,  G01N27/30

Abstract: Provided is a gas sensor element capable of realizing both highly accurate concentration measurement in environments where the concentration of a specific gas in a measurement target gas is high and highly accurate concentration measurement in environments where the concentration is low. A gas sensor according to one aspect of the present invention adjusts a sensor element drive temperature such that the value of cell resistance of a main pump cell is a predetermined value. Further, in the gas sensor according to one aspect of the present invention, the slope of the cell resistance of the main pump cell is larger than the slope of cell resistance of a measurement pump cell.

公开(公告)号：US20220113279A1

公开(公告)日：2022-04-14

申请号：US17497014

申请日：2021-10-08

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/41 ,  G01N27/407

Abstract: A gas sensor includes: a laminate including at least one layer made of a solid electrolyte; a measured gas flow path formed in the laminate; and a pump electrode exposed in the measured gas flow path. In a part of a rear end side region, the pump electrode is sandwiched between a first layer and a second layer or is covered with a covering layer formed on the inner surface of the measured gas flow path. The area of a portion exposed in the measured gas flow path, of the pump electrode is 4 mm2 or more. The area of a portion exposed in the measured gas flow path, of the front end side region is larger than the area of a portion exposed in the measured gas flow path, of the rear end side region.

公开(公告)号：US20220373503A1

公开(公告)日：2022-11-24

申请号：US17882889

申请日：2022-08-08

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/406 ,  G01N27/407

Abstract: A gas sensor has a sensor element, first element pads, second element pads, first contact-point members, and second contact-point members. The sensor element has first and second surfaces that are positioned on opposite sides in a first direction. The first element pads are disposed on the first surface. The second element pads are disposed on the second surface in a quantity greater than that of the first element pads. The first and second contact-point members are connected to the first and second element pads, respectively. The width (Wt) of at least one of the second contact-point members is less than the widths (Wa-Wd) of the rest of the first and second contact-point members.

公开(公告)号：US20210172902A1

公开(公告)日：2021-06-10

申请号：US17113432

申请日：2020-12-07

Applicant: NGK INSULATORS, LTD.

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

IPC: G01N27/406 ,  H01R11/11 ,  G01N27/409 ,  H01R4/18 ,  H01R13/20

Abstract: A metal terminal includes an element contacting portion which is disposed at one end of the metal terminal and is placed in contact with a sensor element, a lead wire retaining member which is disposed at another end of the metal terminal, and crimps and retains lead wires, a positioning member disposed between the one end and the other end and extending in a direction intersecting one direction, the positioning member positioning the metal terminal on a ceramic housing, and a guide member provided integrally with the positioning member at a site between the positioning member and the lead wire retaining member.

公开(公告)号：US20210080424A1

公开(公告)日：2021-03-18

申请号：US17022194

申请日：2020-09-16

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 plurality of element pads formed on a rear end portion of the sensor element; and a plurality of contact members holding the rear end portion of the sensor element and electrically connected respectively to the plurality of element pads. The plurality of contact members include contact members that each have an outer end surface protruding out from a corresponding one of end surfaces of the sensor element.

公开(公告)号：US20210063343A1

公开(公告)日：2021-03-04

申请号：US16991082

申请日：2020-08-12

Applicant: NGK INSULATORS, LTD.

Inventor： Yusuke WATANABE ,  Shotaro NIIZUMA

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

Abstract: A sensor element includes: a sensor electrode disposed on one main surface of a solid electrolyte layer to face a measurement gas introduction space, and having an oxygen decomposition ability and a NOx decomposition ability; a monitor electrode disposed on the one main surface of the solid electrolyte layer to face the measurement gas introduction space, and having the oxygen decomposition ability; and a reference electrode disposed on the other main surface of the solid electrolyte layer to face a reference gas introduction space, wherein a heater element of a heater part overlaps 50% or more of an area of each of the sensor electrode and the monitor electrode in plan view.