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    OXYGEN SENSOR ELEMENT AND METHOD FOR MANUFACTURING SAME
    1.
    发明公开
    OXYGEN SENSOR ELEMENT AND METHOD FOR MANUFACTURING SAME 审中-公开

    公开(公告)号：US20240272107A1

    公开(公告)日：2024-08-15

    申请号：US18567069

    申请日：2022-06-09

    Applicant: NAGAOKA UNIVERSITY OF TECHNOLOGY ,  KOA CORPORATION

    Inventor： Tomoichiro OKAMOTO ,  Kenichi IGUCHI ,  Yukiko OTA ,  Ryosuke KOMATSU ,  Tetsuro TANAKA ,  Katsuhide NISHIZAWA

    IPC: G01N27/12 ,  G01N33/00

    CPC classification number: G01N27/125 ,  G01N33/0036

    Abstract: An oxygen sensor element that can achieve electric power saving without losing sensor characteristics has a structure in which an outer surface of a ceramic sintered body as a sensing layer made of a composition LnBa2Cu3O7−δ (Ln denotes rare earth element) is covered with heat insulating layers. A heat insulating material having a composition Ln2BaCuO5 is used for the heat insulating layers, and that composition Ln2BaCuO5 is added with 20 mol % of LnBa2Cu3O7−δ. This allows a sintering behavior of the heat insulating layers to come close to a sintering behavior of the sensing layer, and can thus prevent the occurrence of separation of the layers and cracks. The oxygen sensor element has a sandwich structure where the sensing layer is sandwiched between the heat insulating layers, thereby reducing the amount of heat dissipated from the sensing layer, and making it possible to achieve electric power saving.

    GAS SENSOR
    2.
    发明公开
    GAS SENSOR 审中-公开

    公开(公告)号：US20230349851A1

    公开(公告)日：2023-11-02

    申请号：US18206816

    申请日：2023-06-07

    Applicant: KOA CORPORATION

    Inventor： Tetsuro TANAKA ,  Kenichi IGUCHI ,  Ken TAKAHASHI ,  Chika ITO

    IPC: G01N27/12 ,  B28B1/30 ,  B28B1/48 ,  G01N33/00

    CPC classification number: G01N27/125 ,  B28B1/30 ,  B28B1/48 ,  G01N33/0036

    Abstract: A sensor element (12) has a cross-sectional area that continuously only increases from a positive (+) electrode side toward a negative (−) electrode side, thereby leading a hot spot, which attempts to move to the negative electrode side, to a lower resistance side. A position that is at nearly equal distances from paired electrodes (13 and 15) formed on either end of the sensor element (12) is set as a hot spot generating position, so as to avoid damage to the electrodes due to heat emitted by the hot spot.

    ZINC OXIDE VARISTOR
    3.
    发明申请
    ZINC OXIDE VARISTOR 有权

    公开(公告)号：US20210238052A1

    公开(公告)日：2021-08-05

    申请号：US15734863

    申请日：2019-06-04

    Applicant: KOA CORPORATION ,  JFE MINERAL COMPANY, LTD.

    Inventor： Naomi ISHIDA ,  Yoji GOMI ,  Kenichi IGUCHI ,  Etsurou UDAGAWA ,  Yuko ECHIZENYA ,  Yoshimi NAKATA

    IPC: C01G9/00 ,  H01C7/112

    Abstract: Focusing on zinc oxide itself, which is a main raw material for a zinc oxide varistor (laminated varistor), a predetermined amount of additive is added to a zinc oxide powder having crystallite size of 20 to 100 nm, particle diameter of 20 to 110 nm found using a specific area BET method, untamped density of 0.60 g/cm3 or greater, and tap density of 0.80 g/cm3 or greater. This allows a zinc oxide sintered body to secure uniformity, high density, and high electric conductivity, resulting in a zinc oxide varistor with high surge resistance, capable of downsizing and cost reduction. Moreover, addition of aluminum (Al), as a donor element, to the zinc oxide powder allows control of sintered grain size in conformity with the aluminum added amount and baking temperature, and also allows adjustment of varistor voltage, etc.

    GAS SENSOR AND MANUFACTURING METHOD THEREFOR
    5.
    发明申请
    GAS SENSOR AND MANUFACTURING METHOD THEREFOR 有权

    公开(公告)号：US20210010963A1

    公开(公告)日：2021-01-14

    申请号：US17040278

    申请日：2019-03-20

    Applicant: KOA CORPORATION

    Inventor： Tetsuro TANAKA ,  Kenichi IGUCHI ,  Ken TAKAHASHI ,  Chika ITO

    IPC: G01N27/12 ,  G01N33/00 ,  B28B1/48 ,  B28B1/30

    Abstract: A sensor element has a cross-sectional area that increases either uniformly or gradually from a positive (+) electrode side toward a negative (−) electrode side, thereby leading a hot spot, which attempts to move to the negative electrode side, to a lower resistance side. A position that is at nearly equal distances from paired electrodes formed on either end of the sensor element is set as a hot spot generating position, so as to avoid damage to the electrodes due to heat emitted by the hot spot.

    GAS SENSOR AND METHOD FOR MANUFACTURING SAME
    7.
    发明申请
    GAS SENSOR AND METHOD FOR MANUFACTURING SAME 有权

    公开(公告)号：US20210018456A1

    公开(公告)日：2021-01-21

    申请号：US17040332

    申请日：2019-03-20

    Applicant: KOA CORPORATION

    Inventor： Chika ITO ,  Ken TAKAHASHI ,  Tetsuro TANAKA ,  Kenichi IGUCHI

    IPC: G01N27/12 ,  G01N27/416

    Abstract: An oxygen sensor for detecting gas concentration based on either an electric current value or a resistance value measured when a voltage is applied to a sensor element includes gaps formed between electrodes arranged in an element main body and ridges where surfaces of an element touch each other. These gaps will be escaping parts for expansion and contraction of electrode material that accompany thermal expansion and contraction of a sensor main body, and concentration of thermal stress at edge parts of the element main body may thus be eliminated, thereby alleviating thermal stress on the oxygen sensor. This allows provision of a gas sensor that controls generation of cracks in the element and that is stably usable over a long period of time.

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