Patents by Inventor Haruki Yoshida

Haruki Yoshida 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).

  • Patent number: 11469681
    Abstract: A power supply device includes a first output unit that outputs a first alternating current, a second output unit that outputs a second alternating current, and a current combining unit that combines the first alternating current and the second alternating current. The current combining unit includes a first bus bar, a second bus bar, a first conductive member welded to a first surface of the first bus bar and connected to the first output unit, a second conductive member that is welded to a second surface of the first bus bar, penetrates the second bus bar, and is connected to the second output unit, a third conductive member welded to a first surface of the second bus bar and connected to the second output unit, and a fourth conductive member that is welded to a second surface of the second bus bar, penetrates the first bus bar, and is connected to the first output unit. The second surface of the first bus bar faces the second surface of the second bus bar.
    Type: Grant
    Filed: July 28, 2021
    Date of Patent: October 11, 2022
    Assignee: Neturen Co., Ltd.
    Inventors: Takahiko Kanai, Haruki Yoshida
  • Patent number: 11368099
    Abstract: A power conversion apparatus includes a rectifier to convert AC power into constant-current DC power, a resonant inverter to convert the DC power into AC power to be output to a load, and a control unit to receive settings of an output current value of the inverter, a current-supplying time of the inverter, an operation rate defined by dividing the current-supplying time by a sum of the current-supplying time and a non-current-supplying time, and a resonance frequency of the load. The control unit operates the rectifier and the inverter only when it determines that it is operable to perform an output in accordance with the set conditions, based on data in which the output frequency, the current-supplying time and the operation rate are associated with an allowable output current value of the inverter at a temperature equal to or lower than a maximum operable temperature of a switching device.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: June 21, 2022
    Assignee: NETUREN CO., LTD.
    Inventors: Takahiko Kanai, Haruki Yoshida
  • Patent number: 11336195
    Abstract: A power conversion apparatus includes a rectifier to convert AC power into constant-current DC power, a resonant inverter to convert the DC power into AC power to be output to a load, and a control unit to receive settings of an output current value of the inverter, a current-supplying time of the inverter, an operation rate defined by dividing the current-supplying time by a sum of the current-supplying time and a non-current-supplying time, and a resonance frequency of the load. The control unit operates the rectifier and the inverter only when it determines that it is operable to perform an output in accordance with the set conditions, based on data in which the output frequency, the current-supplying time and the operation rate are associated with an allowable output current value of the inverter at a temperature equal to or lower than a maximum operable temperature of a switching device.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: May 17, 2022
    Assignee: NETUREN CO., LTD.
    Inventors: Takahiko Kanai, Haruki Yoshida
  • Publication number: 20220038022
    Abstract: A power supply device includes a first output unit that outputs a first alternating current, a second output unit that outputs a second alternating current, and a current combining unit that combines the first alternating current and the second alternating current. The current combining unit includes a first bus bar, a second bus bar, a first conductive member welded to a first surface of the first bus bar and connected to the first output unit, a second conductive member that is welded to a second surface of the first bus bar, penetrates the second bus bar, and is connected to the second output unit, a third conductive member welded to a first surface of the second bus bar and connected to the second output unit, and a fourth conductive member that is welded to a second surface of the second bus bar, penetrates the first bus bar, and is connected to the first output unit. The second surface of the first bus bar faces the second surface of the second bus bar.
    Type: Application
    Filed: July 28, 2021
    Publication date: February 3, 2022
    Inventors: Takahiko Kanai, Haruki Yoshida
  • Patent number: 11183819
    Abstract: A spark plug according to one embodiment of the present invention includes an insulator formed of an alumina-based sintered body, wherein the insulator contains 90 wt % or more of an aluminum component in terms of oxide, and wherein crystal grains of the insulator has an average grain size of 1.5 mm or smaller and a grain size standard deviation of 1.2 ?m or smaller.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: November 23, 2021
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Yutaka Yokoyama, Nobuyoshi Araki, Kuniharu Tanaka, Haruki Yoshida, Hironori Uegaki, Toshiki Kon, Yusuke Nomura
  • Patent number: 11146041
    Abstract: An insulator for a spark plug including a first portion; a second portion located on the rear side of the first portion, an outer diameter F at a front end of the second portion being smaller than an outer diameter of the first portion; a third portion located on the front side of the first portion, an outer diameter D at a rear end of the third portion being smaller than the outer diameter of the first portion and the outer diameter F at the front end of the second portion; a first slope portion connecting the first portion and the second portion; and a second slope portion connecting the first portion and the third portion. A length A of the second slope portion and a length B of the first slope portion satisfy 2.0?A/B?3.9, and 0.50?D/F?0.88 is satisfied.
    Type: Grant
    Filed: June 23, 2020
    Date of Patent: October 12, 2021
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroki Shimada, Haruki Yoshida, Naoya Harata
  • Publication number: 20210257816
    Abstract: An insulator for a spark plug including a first portion; a second portion located on the rear side of the first portion, an outer diameter F at a front end of the second portion being smaller than an outer diameter of the first portion; a third portion located on the front side of the first portion, an outer diameter D at a rear end of the third portion being smaller than the outer diameter of the first portion and the outer diameter F at the front end of the second portion; a first slope portion connecting the first portion and the second portion; and a second slope portion connecting the first portion and the third portion. A length A of the second slope portion and a length B of the first slope portion satisfy 2.0?A/B?3.9, and 0.50?D/F?0.88 is satisfied.
    Type: Application
    Filed: June 23, 2020
    Publication date: August 19, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroki SHIMADA, Haruki YOSHIDA, Naoya HARATA
  • Patent number: 10973090
    Abstract: An induction heating power supply apparatus includes a smoothing section to smooth pulsating current of DC power output from a DC power supply section, and an inverter to convert the DC power smoothed by the smoothing section to AC power. The smoothing section includes a pair of bus bars connected to the inverter and a capacitor connected to the pair of bus bars. Each of the bus bars has an external surface extending in a current flow direction, the external surface including a flat face having a larger surface dimension than another face of the external surface in a direction perpendicular to the current flow direction. The bus bars are arranged in a layered manner such that the flat faces of the bus bars are opposed to each other and such that an insulator is sandwiched between the flat faces of the bus bars.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: April 6, 2021
    Assignee: NETUREN CO., LTD.
    Inventors: Takahiko Kanai, Masato Sugimoto, Haruki Yoshida
  • Patent number: 10897795
    Abstract: An induction heating power supply apparatus includes a smoothing section to smooth DC power and an inverter section to convert the smoothed DC power into AC power. The inverter section has first and second modules, each having serially connected switching devices. Output bus bars are interposed between the first and second modules. The smoothing section has first bus bars connected to a DC power supply section and the first module, a capacitor connected to the first bus bars, second bus bars connected to the DC power supply section and the second module, and another capacitor connected to the second bus bars. The first and second bus bars extend parallel to the output bus bars. The first module is interposed between the first bus bars and the output bus bars. The second module is interposed between the second bus bars and the output bus bars.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: January 19, 2021
    Assignee: NETUREN CO., LTD.
    Inventors: Takahiko Kanai, Masato Sugimoto, Haruki Yoshida
  • Patent number: 10879675
    Abstract: A spark plug having an insulator with a leg portion whose outer circumferential surface has an arithmetic mean roughness Ra of 0.5 ?m or less. The leg portion has a first section, a second section, and a third section. The first section has an outer diameter that decreases toward the forward end of the first section. The second section is located forward of and adjacent to the first section and its outer diameter decreases toward the forward end of the second section. The outer circumferential surface of the second section is located inward of a first straight line passing through the base and forward ends of the outer circumferential surface of the first section. The third section is located forward of and adjacent to the second section. The outer diameter of the third section is equal to or less than a forward end outer diameter Ds of the second section over the entire third section.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: December 29, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Haruki Yoshida, Kuniharu Tanaka, Yutaka Yokoyama, Shun Kondo, Hirokazu Kurono, Toshimasa Saji
  • Publication number: 20200403522
    Abstract: A power conversion apparatus includes a rectifier to convert AC power into constant-current DC power, a resonant inverter to convert the DC power into AC power to be output to a load, and a control unit to receive settings of an output current value of the inverter, a current-supplying time of the inverter, an operation rate defined by dividing the current-supplying time by a sum of the current-supplying time and a non-current-supplying time, and a resonance frequency of the load. The control unit operates the rectifier and the inverter only when it determines that it is operable to perform an output in accordance with the set conditions, based on data in which the output frequency, the current-supplying time and the operation rate are associated with an allowable output current value of the inverter at a temperature equal to or lower than a maximum operable temperature of a switching device.
    Type: Application
    Filed: November 19, 2018
    Publication date: December 24, 2020
    Applicant: NETUREN CO., LTD.
    Inventors: Takahiko KANAI, Haruki YOSHIDA
  • Publication number: 20200313541
    Abstract: An inverter of a power supply apparatus includes a smoothing circuit. The smoothing circuit includes a circuit body having a positive-side output terminal and a negative-side output terminal, and a plurality of capacitors mounted on the circuit body and connected in parallel between the positive-side output terminal and the negative-side output terminal. A difference between the maximum value and the minimum value among positive-negative electrical path lengths lnPNi=lnPi+lnNi (i=1, 2, and 3) for the respective capacitors is equal to or smaller than 30% of the minimum value.
    Type: Application
    Filed: October 2, 2018
    Publication date: October 1, 2020
    Applicant: NETUREN CO., LTD.
    Inventors: Takahiko KANAI, Haruki YOSHIDA
  • Patent number: 10736184
    Abstract: A power supply apparatus for induction heating is provided. The power supply apparatus includes a smoothing filter configured to smooth a pulsating current of DC power output from a DC power supply, and an inverter configured to convert the DC power that has been smoothed by the smoothing filter into AC power. The smoothing filter includes a plurality of capacitors having different internal inductances and connected to each other in parallel between input terminals of the inverter, each of the capacitors being connected to the input terminals of the inverter directly or through a pair of bus bars. The plurality of capacitors includes a first capacitor and a second capacitor, the first capacitor having smaller internal inductance than the second capacitor and a shorter conductive path between the input terminals of the inverter than the second capacitor.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: August 4, 2020
    Assignee: NETUREN CO., LTD.
    Inventors: Takahiko Kanai, Masato Sugimoto, Haruki Yoshida
  • Publication number: 20200112146
    Abstract: A spark plug according to one embodiment of the present invention includes an insulator formed of an alumina-based sintered body, wherein the insulator contains 90 wt % or more of an aluminum component in terms of oxide, and wherein crystal grains of the insulator has an average grain size of 1.5 mm or smaller and a grain size standard deviation of 1.2 ?m or smaller.
    Type: Application
    Filed: September 18, 2019
    Publication date: April 9, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yutaka Yokoyama, Nobuyoshi Araki, Kuniharu Tanaka, Haruki Yoshida, Hironori Uegaki, Toshiki Kon, Yusuke Nomura
  • Patent number: 10586627
    Abstract: The spark plug includes an insulator made from an alumina-based sintered body, and the insulator contains 90 to 98 wt % of an Al component in oxide equivalent. The insulator contains 1 to 5 wt % of an Si component, 0.1 to 1 wt % of an Mg component, 2 wt % or less of a Ca component, 0.3 to 6 wt % of a Ba component, and 0.11 to 5 wt % of a rare earth component, in oxide equivalent. In analysis using a scanning transmission electron microscope with a probe diameter of an electron beam set at 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, and an alkaline earth metal at the crystal grain boundary is less than a detection limit.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: March 10, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Haruki Yoshida, Kuniharu Tanaka, Shun Kondo, Yutaka Yokoyama, Yusuke Nomura, Michitaka Yamada
  • Patent number: 10424901
    Abstract: Provided is a spark plug capable of ensuring fouling resistance with a simple configuration. An insulator includes a step portion formed on an outer circumferential surface thereof. A center electrode is arranged in an axial hole of the insulator. A cylindrical metal shell having a shelf portion formed on an inner circumferential surface thereof is arranged radially outside the insulator. The insulator further includes a front end portion located frontward of the step portion. An outer circumferential surface of the front end portion has an arithmetic average roughness of 0.5 ?m or smaller in a circumferential direction. A recess is formed with a depth of 3 to 20 ?m in at least part of an end surface and the outer circumferential surface of the front end portion so as to extend from the front toward the rear.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: September 24, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Jumpei Isasa, Seiji Nakano, Hirokazu Kurono, Kuniharu Tanaka, Yutaka Yokoyama, Haruki Yoshida, Shun Kondo
  • Patent number: 10348061
    Abstract: The spark plug includes an insulator formed of an alumina-based sintered body, and the insulator contains Si, Ba, and a rare earth element. In an analysis of the insulator by using a scanning transmission electron microscope having an electron-probe diameter of 1 nm, Si and a rare earth element are detected at a crystal grain boundary having a thickness of 15 nm or less, a content of an alkaline earth metal is less than a detection limit at the crystal grain boundary, and a diffraction spot is present in an electron diffraction pattern of a portion where Ba is detected.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: July 9, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Hideto Yamada, Haruki Yoshida, Kuniharu Tanaka, Michitaka Yamada, Yusuke Nomura
  • Publication number: 20190206810
    Abstract: A power semiconductor module, a snubber circuit for the power semiconductor module, and induction heating power supply apparatus having the power semiconductor module are provided. The power semiconductor module includes a power semiconductor device configured to perform a switching operation, a casing inside which the power semiconductor device is provided, a control circuit board provided on top of an upper surface of the casing, a control terminal for the power semiconductor device being provided on the upper surface of the casing and connected to the control circuit board, and a shield plate disposed between the control circuit board and the upper surface of the casing to cover the upper surface of the casing and to cover at least one side surface of the casing.
    Type: Application
    Filed: August 16, 2017
    Publication date: July 4, 2019
    Applicant: NETUREN CO., LTD.
    Inventors: Takahiko KANAI, Masato SUGIMOTO, Haruki YOSHIDA
  • Patent number: 10340667
    Abstract: A spark plug having a resistor disposed between a metal terminal and a center electrode so as to be electrically connected to the metal terminal and the center electrode, wherein the resistor is in contact with an inner circumferential surface of the insulator. On a cross section taken along the axial line so as to include the axial line, in a case where a plurality of points are plotted at predetermined intervals in a direction of the axial line so as to be present on a partial boundary line, within an arbitrary range in the direction of the axial line, of a boundary line between the insulator and the resistor, and a regression line is drawn by a least-squares method with use of the plurality of points, an average value of distances in a direction perpendicular to the regression line between the regression line and the partial boundary line is 0.1 to 0.3 ?m.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: July 2, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Toshinori Takeichi, Kuniharu Tanaka, Hirokazu Kurono, Haruki Yoshida, Hironori Uegaki
  • Patent number: 10305260
    Abstract: Disclosed is a spark plug including: an insulator having an axial hole formed along an axis of the spark plug; a center electrode disposed in a front end side of the axial hole; and a metal shell fixed around an outer circumference of the insulator, with a front end portion of the insulator protruding frontward from a front end of the metal shell. The front end portion of the insulator consists only of a first section and a second section located adjacent to and frontward of the first section and having an inner diameter larger than that of the first section. The second section has a chamfered area formed on an inner circumferential surface thereof so as to continue to a front end of the insulator.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: May 28, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Haruki Yoshida, Kuniharu Tanaka, Toshinori Takeichi, Michitaka Yamada, Yusuke Nomura