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.

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.

公开(公告)号：US20210041409A1

公开(公告)日：2021-02-11

申请号：US16966203

申请日：2019-01-30

Applicant: KOA CORPORATION ,  NAGAOKA UNIVERSITY OF TECHNOLOGY

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

IPC: G01N33/00 ,  G01N27/409 ,  G01N27/407 ,  C04B35/45

Abstract: An oxygen sensor element made of a ceramic sintered body detects oxygen concentration based on an electric current value measured when a voltage is applied. The ceramic sintered body has a composition formula LnBa2-xSrxCu3O7-δ generated by substituting any element selected from group 2 elements in the periodic table, such as strontium (Sr), for a part of a composition formula LnBa2Cu3O7-δ (Ln denotes rare earth element and δ is 0 to 1). Sr substitution quantity x should satisfy an inequality constraint 0

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.

公开(公告)号：US20220018804A1

公开(公告)日：2022-01-20

申请号：US17293604

申请日：2019-11-27

Applicant: KOA CORPORATION

Inventor： Tetsuro TANAKA

IPC: G01N27/407 ,  G01N27/409 ,  G01N27/12 ,  G01N27/14

Abstract: An oxygen sensor is provided in which an insulative coating using an exterior resin material made of insulative resin is applied to a self-heating oxygen sensor element made of a ceramic sintered body housed in a case, and in which waterproof cloths with air permeability are attached using resin adhesives so as to cover openings that connect to air holes on end parts of the case. This allows provision of a gas sensor for use both in air and in liquid having insulating property, waterproof property, and thermal safety.

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.