Patents by Inventor Takeshi Mitsuoka

Takeshi Mitsuoka 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: 20190259918
    Abstract: An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The optical wavelength conversion member (9) is formed of a ceramic sintered body having a fluorescent phase containing fluorescent crystal grains as a main component and a translucent phase containing translucent crystal grains as a main component. Crystal grains of the fluorescent phase have a composition represented by formula A3B5O12:Ce, where the element A is selected from Sc, Y, and lanthanoids (except for Ce), and the element B is selected from Al and Ga. In the optical wavelength conversion member (9), 0.3<a<34 and 300 ?m<y<1,050 ?m are satisfied, wherein a represents the area ratio of the translucent phase to the fluorescent phase in a cross section of the optical wavelength conversion member (9), and y represents the interfacial length of the fluorescent phase.
    Type: Application
    Filed: October 20, 2017
    Publication date: August 22, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Shohei TAKAKU, Yusuke KATSU, Tsuneyuki ITO, Yuki SHIMURA, Takeshi MITSUOKA, Jun MOTEKI
  • Publication number: 20190245119
    Abstract: A method for producing an optical wavelength conversion member (9) composed of a sintered body containing, as main components, Al2O3 and a component represented by formula A3B5O12:Ce; an optical wavelength conversion member; an optical wavelength conversion component including the optical wavelength conversion member; and a light-emitting device including the optical wavelength conversion member or the optical wavelength conversion component. The production method of the sintered body includes firing in a firing atmosphere having a pressure of 104 Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %.
    Type: Application
    Filed: October 24, 2017
    Publication date: August 8, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yusuke KATSU, Shohei TAKAKU, Tsuneyuki ITO, Takeshi MITSUOKA, Jun MOTEKI
  • Publication number: 20190245118
    Abstract: An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The light-emitting device (1) includes a container (3), a light-emitting element (5), and an optical wavelength conversion member (9). The optical wavelength conversion member (9) is composed of a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains of a component represented by formula A3B5O12:Ce. Specifically, A and B of the A3B5O12 individually represent at least one element selected from the following element groups: A: Sc, Y, and lanthanoids (except for Ce), and B: Al and Ga; the at least one element selected from the element groups is present in each crystal grain and the crystal grain boundary of the ceramic sintered body; and the element concentration of the crystal grain boundary is higher than the element concentration of the crystal grain.
    Type: Application
    Filed: October 20, 2017
    Publication date: August 8, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Jun MOTEKI, Shohei TAKAKU, Yusuke KATSU, Takeshi MITSUOKA, Tsuneyuki ITO
  • Publication number: 20190241475
    Abstract: An object of the present disclosure is to improve the properties of a ceramic composition. A ceramic composition contains alumina (Al2O3) and tungsten carbide (WC) and is characterized in that an atomic layer formed of at least one element selected from among transition metals belonging to Groups 4 to 6 of the periodic table, yttrium (Y), scandium (Sc), and lanthanoids is present at a crystal grain boundary between an alumina (Al2O3) crystal grain and a tungsten carbide (WC) crystal grain.
    Type: Application
    Filed: September 20, 2017
    Publication date: August 8, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yusuke KATSU, Toshiaki KURAHASHI, Hideto YAMADA, Takeshi MITSUOKA
  • Publication number: 20190233333
    Abstract: The durability of a ceramic sintered body is improved, and a reduction in its light emission intensity and the occurrence of a chromaticity variation are suppressed. The ceramic sintered body contains alumina and a compound represented by M13-XM2XM35O12. The volume percent of the compound in the ceramic sintered body is from 3% to 70% inclusive. The ratio of the intensity of XRD from a complex oxide of aluminum and M2 to the intensity of XRD from the compound in the ceramic sintered body is less than 0.05. The average grain diameter of the alumina contained in the ceramic sintered body is from 0.30 (?m) to 3.00 (?m) inclusive. M1 is at least one selected from Sc, Y, and lanthanoid elements, and M2 is at least one selected from lanthanoid elements except any lanthanoid element selected for M1. M3 is at least one of Al and Ga, and X is from 0.003 to 0.500 inclusive.
    Type: Application
    Filed: June 19, 2017
    Publication date: August 1, 2019
    Inventors: Jun MOTEKI, Yusuke KATSU, Takeshi MITSUOKA
  • Publication number: 20190198726
    Abstract: An optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains of a component represented by formula A3B5O12:Ce, wherein A is at least one element selected from Sc, Y and lanthanoids (except for Ce), and B is at least one element selected from Al and Ga. Further, the following relations are satisfied: 0%?X?25%, 9%?Y?45%, and 48%?Z?90%, wherein X represents a proportion corresponding to the ratio a/N, Y represents a proportion corresponding to the ratio b/N, and Z represents a proportion corresponding to the ratio c/N and a, b, c and N are as defined herein. Also disclosed is a light-emitting device including the optical wavelength conversion member.
    Type: Application
    Filed: October 18, 2017
    Publication date: June 27, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Jun MOTEKI, Shohei TAKAKU, Yusuke KATSU, Takeshi MITSUOKA, Tsuneyuki ITO
  • Patent number: 9550699
    Abstract: In a ceramic composition mainly composed of alumina (Al2O3), tungsten carbide (WC) and zirconia (ZrO2), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (Al2O3) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al2O3) crystal grains are adjacent to each other.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: January 24, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Jun Moteki, Yusuke Katsu, Takeshi Mitsuoka
  • Patent number: 9385511
    Abstract: A spark plug including an insulator containing an Al component, in terms of oxides, 89 mass % or more and a Ti component, in terms of oxides, more than 0 mass % and 0.2 mass % or less, characterized in that the insulator is formed of an alumina-based sintered material which contains, in a grain boundary phase present between alumina crystal grains, a first crystal phase containing at least one species selected from among an La component, an Nd component, a Pr component, a Y component, an Er component, a Yb component, and an Lu component, and a second crystal phase containing at least one species of Group 2 element components, an Al component and an Si component.
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: July 5, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroki Takeuchi, Yutaka Yokoyama, Kuniharu Tanaka, Takeshi Mitsuoka, Toshitaka Honda, Hirokazu Kurono, Katsuya Takaoka, Hironori Uegaki
  • Patent number: 9291525
    Abstract: A gas sensor element and a gas sensor incorporating the gas sensor element. The gas sensor element (100) includes a detection portion (150) including a solid electrolyte body (105) and a pair of electrodes (104) and (106) disposed on the solid electrolyte body; and a porous protection layer (20) covering the detection portion. The porous protection layer includes an inner porous layer (21) and an outer porous layer (23). The inner porous layer has a higher porosity than the outer porous layer. Further, the inner porous layer contains, as main components, ceramic particles (21a), and ceramic fiber filaments (21b), and the amount of the ceramic fiber filaments is 25 to 75 vol % based on the total amount of the ceramic particles and the ceramic fiber filaments taken as 100 vol %.
    Type: Grant
    Filed: May 31, 2013
    Date of Patent: March 22, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Shigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Publication number: 20160023952
    Abstract: In a ceramic composition mainly composed of alumina (Al2O3), tungsten carbide (WC) and zirconia (ZrO2), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (Al2O3) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al2O3) crystal grains are adjacent to each other.
    Type: Application
    Filed: December 27, 2013
    Publication date: January 28, 2016
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Jun MOTEKI, Yusuke KATSU, Takeshi MITSUOKA
  • Patent number: 9247585
    Abstract: A ceramic heater element 10 includes an insulating substrate 101, and a heating resistor 102 embedded in the insulating substrate 101. The insulating substrate 101 contains a main phase formed of ?-SiAlON or a multiphase SiAlON of ?-SiAlON and ?-SiAlON; a grain boundary phase containing a rare earth element; and a silicide of at least one species selected from among Cr, W, Mo, V, and Fe. The heating resistor 102 contains a main phase formed of an electrically conductive compound containing at least one species selected from among silicide, nitride, and carbide of Mo, and silicide, nitride, and carbide of W; ?-SiAlON or a multiphase SiAlON of ?-SiAlON and ?-SiAlON; and a grain boundary phase containing a rare earth element.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: January 26, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Yutaka Sekiguchi, Yoshihito Ikai, Takeshi Mitsuoka
  • Patent number: 9234870
    Abstract: A gas sensor element (100) including a detection portion (150) including a solid electrolyte body (105) and a pair of electrodes (104) and (106) disposed on the solid electrolyte body; and a porous protection layer (20) covering the detection portion. The porous protection layer includes an inner porous layer (21) and an outer porous layer (23); the inner porous layer is higher in porosity than the outer porous layer; the inner porous layer contains, as main components, ceramic particles (21a), and ceramic fiber filaments (21b) which are mainly formed of a ceramic material and which have a mean fiber length of 70 to 200 ?m; and the amount of the ceramic fiber filaments is 25 to 75 vol % on the basis of the total amount of the ceramic particles and the ceramic fiber filaments, the total amount being taken as 100 vol %.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: January 12, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Shigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Patent number: 9160145
    Abstract: An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met: 0.40?Y/X?2.00 0.10?Z/X?0.40.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: October 13, 2015
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Katsuya Takaoka, Yutaka Yokoyama, Kengo Fujimura, Hironori Uegaki, Hiroki Takeuchi, Hirokazu Kurono, Toshitaka Honda, Kuniharu Tanaka, Takeshi Mitsuoka
  • Publication number: 20150207300
    Abstract: A spark plug including an insulator containing an Al component, in terms of oxides, 89 mass % or more and a Ti component, in terms of oxides, more than 0 mass % and 0.2 mass % or less, characterized in that the insulator is formed of an alumina-based sintered material which contains, in a grain boundary phase present between alumina crystal grains, a first crystal phase containing at least one species selected from among an La component, an Nd component, a Pr component, a Y component, an Er component, a Yb component, and an Lu component, and a second crystal phase containing at least one species of Group 2 element components, an Al component and an Si component.
    Type: Application
    Filed: August 23, 2013
    Publication date: July 23, 2015
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroki Takeuchi, Yutaka Yokoyama, Kuniharu Tanaka, Takeshi Mitsuoka, Toshitaka Honda, Hirokazu Kurono, Katsuya Takaoka, Hironori Uegaki
  • Patent number: 9080964
    Abstract: A gas sensor element (100) includes a laminate of a detection element (300) and a heater (200), and a porous protection layer (20) covering a forward end portion thereof. The laminate has a measuring chamber (107c) into which a gas-to-be-measured is introduced via a diffusion resistor (115). The porous protection layer includes an inner porous layer (21), and an outer porous layer (23). The inner porous layer has a higher porosity than the outer porous layer and the diffusion resistor. As viewed in a plurality of 100 ?m×100 ?m regions a1 to a3 and b1 to b3 on sections of the inner porous layer and the diffusion resistor, respectively, a pore diameter greater than the greatest pore diameter CDIF in the regions of the diffusion resistor exists in each of the regions of the inner porous layer.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: July 14, 2015
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Sigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Patent number: 8992752
    Abstract: There is provided a gas sensor element for detecting the concentration of a specific gas component in gas under measurement, which includes a plate-shaped element body and a porous protection layer. The element body has, at one end portion thereof, a gas sensing portion formed with a solid electrolyte substrate and a pair of electrodes. The porous protection layer has a porous structure formed of ceramic particles and surrounds at least the circumference of the one end portion of the element body. In the present invention, the porous protection layer has an inner region, an intermediate region and an outer region laminated together in order of mention from the element body toward the outside. The intermediate region has a porosity lower than those of the inner and outer regions. There is also provided a gas sensor with such a gas sensor element.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: March 31, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Masaki Onkawa, Shigehiro Otsuka, Seiji Oya, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Patent number: 8927447
    Abstract: A ceramic sintered body includes tungsten carbide, zirconia, and alumina. The content of the tungsten carbide is 20 to 50 vol %, and the content of the zirconia is 5 to 25 vol %. The crystal phase of the zirconia is a tetragonal crystal or a mixture of tetragonal and monoclinic crystals. The ceramic sintered body does not substantially include Ti compounds. The average particle diameter of the tungsten carbide, the average particle diameter of the zirconia, and the average particle diameter of the alumina are all 1 ?m or less.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: January 6, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Jun Moteki, Yusuke Katsu, Takeshi Mitsuoka
  • Patent number: 8889577
    Abstract: A sintered body containing alumina crystal particles and zirconia crystal particles as main components includes the tetragonal crystal particles as the zirconia crystal particles. The zirconia crystal particles satisfy relations 0%?A?3%, 3%?B?22% and 77%?C?96%,where A, B and C are as defined herein.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: November 18, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Jun Moteki, Yusuke Katsu, Kuniharu Tanaka, Takeshi Mitsuoka, Yoshihiro Kuroki, Hironobu Kusanagi
  • Publication number: 20140336035
    Abstract: An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met: 0.40?Y/X?2.00 0.10?Z/X?0.40.
    Type: Application
    Filed: May 8, 2014
    Publication date: November 13, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Katsuya TAKAOKA, Yutaka YOKOYAMA, Kengo FUJIMURA, Hironori UEGAKI, Hiroki TAKEUCHI, Hirokazu KURONO, Toshitaka HONDA, Kuniharu TANAKA, Takeshi MITSUOKA
  • Publication number: 20140291150
    Abstract: A gas sensor element (100) including a detection portion (150) including a solid electrolyte body (105) and a pair of electrodes (104) and (106) disposed on the solid electrolyte body; and a porous protection layer (20) covering the detection portion. The porous protection layer includes an inner porous layer (21) and an outer porous layer (23); the inner porous layer is higher in porosity than the outer porous layer; the inner porous layer contains, as main components, ceramic particles (21a), and ceramic fiber filaments (21b) which are mainly formed of a ceramic material and which have a mean fiber length of 70 to 200 ?m; and the amount of the ceramic fiber filaments is 25 to 75 vol % on the basis of the total amount of the ceramic particles and the ceramic fiber filaments, the total amount being taken as 100 vol %.
    Type: Application
    Filed: November 20, 2012
    Publication date: October 2, 2014
    Applicant: NGK SPARK PLUG CO. LTD.
    Inventors: Shigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka