Patents by Inventor Shigehiro OHTSUKA

Shigehiro OHTSUKA 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).

  • Publication number: 20200363369
    Abstract: Provided are a gas sensor element which is not prone to decreased precision of gas detection due to a decrease in temperature of a gas to be measured, and a gas sensor. An aspect of the present invention is a gas sensor element for detecting a specific gas included in a gas to be measured, the gas sensor element being provided with a solid electrolyte, a reference electrode, a measurement electrode, and a gas restricting layer. The thickness dimension WA of a portion of the gas restricting layer that is in contact with the measurement electrode, the thickness dimension WB of a portion of the gas restricting layer that is in contact with the solid electrolyte, and the thickness dimension WC of the measurement electrode satisfy the conditions WB>WA and WB?WA>WC. In a gas sensor element provided with such a gas restricting layer, the heat capacity of the gas restricting layer can be increased without hindering the gas to be measured from reaching the measurement electrode.
    Type: Application
    Filed: September 12, 2018
    Publication date: November 19, 2020
    Inventors: Mika TANGE, Keisuke NAKAGAWA, Takashi NAKAO, Shigehiro OHTSUKA
  • Patent number: 10352893
    Abstract: A gas sensor control apparatus including a gas sensor element, a heater for heating the gas sensor element, and heater energization control means for feedback controlling the supply of electric current to the heater such that the internal resistance of the gas sensor element coincides with a target resistance. The gas sensor element has a solid electrolyte member and an electrode portion including an outside electrode and an inside electrode. At least a portion of the electrode portion is formed of an electrically conductive oxide whose main component is (i) a first perovskite phase which is represented by a composition formula of LaCo1?xNixO3±d (0.300?x?0.600, 0?d?0.4) and has a perovskite-type crystal structure, or (ii) a second perovskite phase which is represented by a composition formula of LaFe1?yNiyO3±d (0.450?y?0.700, 0?d?0.4) and has a perovskite-type crystal structure.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: July 16, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Keisuke Nakagawa, Shigehiro Ohtsuka, Hisashi Kozuka, Kazuma Ito, Ippei Kato
  • Patent number: 10012612
    Abstract: An inside lead portion of a gas sensor element has a lanthanum zirconate layer arranged between an electrically conductive oxide layer and a solid electrolyte member. Meanwhile, an inside detection electrode portion of the gas sensor element is formed such that (i) no lanthanum zirconate layer is formed between an electrically conductive oxide layer and the solid electrolyte member, or (ii) a lanthanum zirconate layer thinner than the lanthanum zirconate layer of the inside lead portion is formed between the electrically conductive oxide layer and the solid electrolyte member.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: July 3, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Shigehiro Ohtsuka, Tomohiro Nishi, Keisuke Nakagawa, Kazuma Ito, Ippei Kato
  • Patent number: 9753020
    Abstract: A gas sensor element has a protection layer smaller in heat capacity than a conventional protection layer formed by a dipping process. A gas sensor includes the gas sensor element. The gas sensor element is manufactured by a method of manufacturing. The gas sensor element includes at least one space formed between a protection layer and an element body. The space is positioned over at least one of four vertexes of a forward end of the element body at a location at which the thickness of the protection layer is likely to become small. Therefore, it is possible to restrain breakage of the vertexes of the forward end of the element body which could otherwise result from thermal shock stemming from adhesion of water. The protection layer of the gas sensor element can be reduced in thickness and thus in heat capacity as compared with a conventional protection layer.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: September 5, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Toru Iwano, Masaki Onkawa, Tatsuhiko Muraoka, Shun Sakuma, Shigehiro Ohtsuka, Masaki Mizutani
  • Patent number: 9694387
    Abstract: A gas sensor element in an air/fuel ratio sensor includes an element body and a protection layer having two layers (a first layer and a second layer). The gas sensor element has at least one separation portion in the form of a space between the first layer and the second layer. The gas sensor element can temporarily accumulate, in the at least one separation portion, water which adheres to the surface of the protection layer and penetrates into the protection layer. Thus, as compared with a protection layer which is identical in thickness to the protection layer, but does not have separation portions, water adhering to the protection layer is less likely to reach the element body. Therefore, there can be restrained breakage of an end of the element body which could otherwise result from thermal shock stemming from adhesion of water.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: July 4, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Masaki Onkawa, Shun Sakuma, Toru Iwano, Tatsuhiko Muraoka, Shigehiro Ohtsuka, Masaki Mizutani
  • Publication number: 20170059511
    Abstract: A gas sensor control apparatus including a gas sensor element, a heater for heating the gas sensor element, and heater energization control means for feedback controlling the supply of electric current to the heater such that the internal resistance of the gas sensor element coincides with a target resistance. The gas sensor element has a solid electrolyte member and an electrode portion including an outside electrode and an inside electrode. At least a portion of the electrode portion is formed of an electrically conductive oxide whose main component is (i) a first perovskite phase which is represented by a composition formula of LaCo1-xNixO3±d (0.300?x?0.600, 0?d?0.4) and has a perovskite-type crystal structure, or (ii) a second perovskite phase which is represented by a composition formula of LaFe1-yNiyO3±d (0.450?y?0.700, 0?d?0.4) and has a perovskite-type crystal structure.
    Type: Application
    Filed: August 29, 2016
    Publication date: March 2, 2017
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Keisuke NAKAGAWA, Shigehiro OHTSUKA, Hisashi KOZUKA, Kazuma ITO, Ippei KATO
  • Publication number: 20170016849
    Abstract: An inside lead portion of a gas sensor element has a lanthanum zirconate layer arranged between an electrically conductive oxide layer and a solid electrolyte member. Meanwhile, an inside detection electrode portion of the gas sensor element is formed such that (i) no lanthanum zirconate layer is formed between an electrically conductive oxide layer and the solid electrolyte member, or (ii) a lanthanum zirconate layer thinner than the lanthanum zirconate layer of the inside lead portion is formed between the electrically conductive oxide layer and the solid electrolyte member.
    Type: Application
    Filed: July 12, 2016
    Publication date: January 19, 2017
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Shigehiro OHTSUKA, Tomohiro NISHI, Keisuke NAKAGAWA, Kazuma ITO, Ippei KATO
  • Patent number: 9476863
    Abstract: A gas sensor element comprises an elongated plate-like element including, at a forward end portion, a detecting section comprising a solid electrolyte body having an outer surface and a back surface, a detection electrode on the outer surface and a reference electrode on the back surface, and a porous layer covering the detection electrode. The coating layer includes a first protection layer entirely covering the detecting section, and a second protection layer circumferentially covering the first protection layer and extending at least from a forward end of the first protection layer to a position located rearward of the porous layer. The thickness of the first protection layer on the porous layer is larger than that of the first protection layer rearward of the porous layer. The thickness of the second protection layer rearward of the porous layer is larger than that of the second protection layer above the porous layer.
    Type: Grant
    Filed: September 12, 2014
    Date of Patent: October 25, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Shun Sakuma, Masaki Onkawa, Toru Iwano, Tatsuhiko Muraoka, Shigehiro Ohtsuka, Masaki Mizutani
  • Publication number: 20150114085
    Abstract: A gas sensor element has a protection layer smaller in heat capacity than a conventional protection layer formed by a dipping process. A gas sensor includes the gas sensor element. The gas sensor element is manufactured by a method of manufacturing. The gas sensor element includes at least one space formed between a protection layer and an element body. The space is positioned over at least one of four vertexes of a forward end of the element body at a location at which the thickness of the protection layer is likely to become small. Therefore, it is possible to restrain breakage of the vertexes of the forward end of the element body which could otherwise result from thermal shock stemming from adhesion of water. The protection layer of the gas sensor element can be reduced in thickness and thus in heat capacity as compared with a conventional protection layer.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Inventors: Toru IWANO, Masaki ONKAWA, Tatsuhiko MURAOKA, Shun SAKUMA, Shigehiro OHTSUKA, Masaki MIZUTANI
  • Publication number: 20150114102
    Abstract: A gas sensor element in an air/fuel ratio sensor includes an element body and a protection layer having two layers (a first layer and a second layer). The gas sensor element has at least one separation portion in the form of a space between the first layer and the second layer. The gas sensor element can temporarily accumulate, in the at least one separation portion, water which adheres to the surface of the protection layer and penetrates into the protection layer. Thus, as compared with a protection layer which is identical in thickness to the protection layer, but does not have separation portions, water adhering to the protection layer is less likely to reach the element body. Therefore, there can be restrained breakage of an end of the element body which could otherwise result from thermal shock stemming from adhesion of water.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Inventors: Masaki ONKAWA, Shun SAKUMA, Toru IWANO, Tatsuhiko MURAOKA, Shigehiro OHTSUKA, Masaki MIZUTANI
  • Publication number: 20150075254
    Abstract: A gas sensor element comprises an elongated plate-like element including, at a forward end portion, a detecting section comprising a solid electrolyte body having an outer surface and a back surface, a detection electrode on the outer surface and a reference electrode on the back surface, and a porous layer covering the detection electrode. The coating layer includes a first protection layer entirely covering the detecting section, and a second protection layer circumferentially covering the first protection layer and extending at least from a forward end of the first protection layer to a position located rearward of the porous layer. The thickness of the first protection layer on the porous layer is larger than that of the first protection layer rearward of the porous layer. The thickness of the second protection layer rearward of the porous layer is larger than that of the second protection layer above the porous layer.
    Type: Application
    Filed: September 12, 2014
    Publication date: March 19, 2015
    Inventors: Shun SAKUMA, Masaki ONKAWA, Toru IWANO, Tatsuhiko MURAOKA, Shigehiro OHTSUKA, Masaki MIZUTANI