Patents by Inventor Kouji TOIDA
Kouji TOIDA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10883959Abstract: A plate-shaped sensor element (10) including at least a first layer (150), a second layer (130), and a third layer (140) being stacked in a stacking direction. The first layer and the third layer are mainly formed of ceramic. The second layer is disposed between the first layer and the third layer in the stacking direction. The second layer has an air introduction hole (131) opened at an end surface. In a cross-section perpendicular to a direction of an axis O, a length L1 of a shortest line segment P1 connecting an upper end surface (10a, 10b) of the sensor element and the centroid G1 of the sensor element and a length L2 of a shortest line segment P2 connecting the upper end surface of the sensor element and the centroid G2 of the air introduction hole, satisfy a relationship of |L2?L1|/L1?0.05.Type: GrantFiled: June 12, 2018Date of Patent: January 5, 2021Assignee: NGK SPARK PLUG CO., LTD.Inventors: Ai Igarashi, Kouji Toida, Shun Sakuma
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Patent number: 10830730Abstract: A plate-shaped sensor element (10) including at least a first layer (150), a second layer (130), and a third layer (140) being stacked in a stacking direction. The first layer and the third layer are mainly formed of ceramic. The second layer is disposed between the first layer and the third layer in the stacking direction. The second layer has an air introduction hole (131) opened at an end surface. In a cross-section perpendicular to a direction of an axis O, a length L1 of a shortest line segment P1 connecting an upper end surface (10a, 10b) of the sensor element and the centroid G1 of the sensor element and a length L2 of a shortest line segment P2 connecting the upper end surface of the sensor element and the centroid G2 of the air introduction hole, satisfy a relationship of |L2?L1|/L1?0.05.Type: GrantFiled: June 12, 2018Date of Patent: November 10, 2020Assignee: NGK SPARK PLUG CO., LTD.Inventors: Ai Igarashi, Kouji Toida, Shun Sakuma
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Patent number: 10634639Abstract: A method for producing a gas sensor element (10), the gas sensor element including a diffusive porous layer (113) disposed in a measurement chamber (111) and exposed to the outside and a ceramic insulating layer (115) forming sidewalls of the measurement chamber. The method includes transferring green diffusive porous layer pieces (113x) cut in advance so as to have prescribed dimensions onto a first ceramic green sheet (110x); applying an insulating paste which later becomes the ceramic insulating layer to the first ceramic green sheet; laminating the first ceramic green sheet onto a second ceramic green sheet (120x) to form a ceramic laminate (200x); cutting the ceramic laminate along prescribed cutting lines C to obtain a plurality of gas sensor element pieces 10x; and firing the gas sensor element pieces.Type: GrantFiled: May 8, 2018Date of Patent: April 28, 2020Assignee: NGK SPARK PLUG CO., LTD.Inventors: Ai Igarashi, Kouji Toida, Akinori Kojima, Akihiro Hara, Hitoshi Furuta
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Patent number: 10481122Abstract: A gas sensor element comprises a solid electrolyte layer; a detection electrode provided on one surface of the solid electrolyte layer; a reference electrode provided on another surface of the solid electrolyte layer; a first layer provided on a side where the other surface of the solid electrolyte layer is present, and having a reference gas flow path; and a heater layer provided on a side opposite to a side where the solid electrolyte layer is provided. In the gas sensor element, an introduction flow path is formed as a flow path for guiding the reference gas from outer surfaces of the gas sensor element to the reference gas flow path. The introduction flow path has an opening provided at an outer surface that is perpendicular to a stacking direction of the gas sensor element and is provided on a side opposite to the heater layer.Type: GrantFiled: April 26, 2017Date of Patent: November 19, 2019Assignee: NGK Spark Plug Co., LTD.Inventors: Ai Igarashi, Kouji Toida, Shun Sakuma
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Publication number: 20180356363Abstract: A plate-shaped sensor element (10) including at least a first layer (150), a second layer (130), and a third layer (140) being stacked in a stacking direction. The first layer and the third layer are mainly formed of ceramic. The second layer is disposed between the first layer and the third layer in the stacking direction. The second layer has an air introduction hole (131) opened at an end surface. In a cross-section perpendicular to a direction of an axis O, a length L1 of a shortest line segment P1 connecting an upper end surface (10a, 10b) of the sensor element and the centroid G1 of the sensor element and a length L2 of a shortest line segment P2 connecting the upper end surface of the sensor element and the centroid G2 of the air introduction hole, satisfy a relationship of |L2?L1|/L1?0.05.Type: ApplicationFiled: June 12, 2018Publication date: December 13, 2018Applicant: NGK SPARK PLUG CO., LTD.Inventors: Ai IGARASHI, Kouji TOIDA, Shun SAKUMA
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Publication number: 20180328879Abstract: A method for producing a gas sensor element (10), the gas sensor element including a diffusive porous layer (113) disposed in a measurement chamber (111) and exposed to the outside and a ceramic insulating layer (115) forming sidewalls of the measurement chamber. The method includes transferring green diffusive porous layer pieces (113x) cut in advance so as to have prescribed dimensions onto a first ceramic green sheet (110x); applying an insulating paste which later becomes the ceramic insulating layer to the first ceramic green sheet; laminating the first ceramic green sheet onto a second ceramic green sheet (120x) to form a ceramic laminate (200x); cutting the ceramic laminate along prescribed cutting lines C to obtain a plurality of gas sensor element pieces 10x; and firing the gas sensor element pieces.Type: ApplicationFiled: May 8, 2018Publication date: November 15, 2018Applicant: NGK SPARK PLUG CO., LTD.Inventors: Ai IGARASHI, Kouji TOIDA, Akinori KOJIMA, Akihiro HARA, Hitoshi FURUTA
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Publication number: 20170315081Abstract: A gas sensor element comprises a solid electrolyte layer; a detection electrode provided on one surface of the solid electrolyte layer; a reference electrode provided on another surface of the solid electrolyte layer; a first layer provided on a side where the other surface of the solid electrolyte layer is present, and having a reference gas flow path; and a heater layer provided on a side opposite to a side where the solid electrolyte layer is provided. In the gas sensor element, an introduction flow path is formed as a flow path for guiding the reference gas from outer surfaces of the gas sensor element to the reference gas flow path. The introduction flow path has an opening provided at an outer surface that is perpendicular to a stacking direction of the gas sensor element and is provided on a side opposite to the heater layer.Type: ApplicationFiled: April 26, 2017Publication date: November 2, 2017Applicant: NGK Spark Plug Co., LTD.Inventors: Ai IGARASHI, Kouji TOIDA, Shun SAKUMA