Patents by Inventor Hiroyuki Kameda

Hiroyuki Kameda 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: 10522978
    Abstract: In an ignition plug, since a ground electrode is formed in a thin-rod-shape or a mesh-like shape, sufficiently strong radicals are locally generated by a barrier discharge, an anti-inflammation effect by the electrode is small, and the growth of a flame is hardly hindered. Furthermore, by making the thickness dimension of a second dielectric facing a discharge region uniform, the barrier discharge is spread over the surface of the second dielectric, the generation of the radicals is maintained, and combustibility after ignition is promoted. Furthermore, because an end portion of a high voltage electrode and a ground electrode are disposed to face each other within a combustion chamber, a fuel gas introduced into the combustion chamber is liable to flow into the discharge region, and is easily ignited by the radicals generated due to the discharge.
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: December 31, 2019
    Assignees: Mitsubishi Electric Corporation, NGK SPARK PLUG CO., LTD.
    Inventors: Taichiro Tamida, Takahiro Inoue, Takashi Hashimoto, Akira Nakagawa, Tomokazu Sakashita, Takayoshi Nagai, Kimihiko Tanaya, Hiroyuki Kameda, Yuichi Yamada, Kenji Ban
  • Patent number: 10153618
    Abstract: A spark plug having an insulator with a front end portion having an annular groove opened to a front side around an axial line. The groove has a width of greater than or equal to 0.2 mm in a radial direction. In a cross section including the axial line, a value D/L obtained by dividing, by a length L, a creepage distance D, from a position P on the frontmost side of a region in which a clearance distance between an outer surface of a front end portion and an inner circumferential surface of a metal shell is less than or equal to 0.1 mm to a connection position between an outer surface of the front end portion and the axial hole, is greater than or equal to 1.1.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: December 11, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Naoyuki Mukoyama, Hiroyuki Kameda
  • Publication number: 20180301877
    Abstract: In an ignition plug, since a ground electrode is formed in a thin-rod-shape or a mesh-like shape, sufficiently strong radicals are locally generated by a barrier discharge, an anti-inflammation effect by the electrode is small, and the growth of a flame is hardly hindered. Furthermore, by making the thickness dimension of a second dielectric facing a discharge region uniform, the barrier discharge is spread over the surface of the second dielectric, the generation of the radicals is maintained, and combustibility after ignition is promoted. Furthermore, because an end portion of a high voltage electrode and a ground electrode are disposed to face each other within a combustion chamber, a fuel gas introduced into the combustion chamber is liable to flow into the discharge region, and is easily ignited by the radicals generated due to the discharge.
    Type: Application
    Filed: October 7, 2016
    Publication date: October 18, 2018
    Applicants: Mitsubishi Electric Corporation, NGK SPARK PLUG CO., LTD.
    Inventors: Taichiro TAMIDA, Takahiro INOUE, Takashi HASHIMOTO, Akira NAKAGAWA, Tomokazu SAKASHITA, Takayoshi NAGAI, Kimihiko TANAYA, Hiroyuki KAMEDA, Yuichi YAMADA, Kenji BAN
  • Publication number: 20180038337
    Abstract: A plasma jet plug includes: a tubular insulator having an axial hole; a center electrode disposed inside the axial hole; metal shell disposed on an outer circumference of the insulator; and an orifice electrode electrically connected to the metal shell and disposed on a front side of the insulator. A plasma generating cavity is formed by a surface of the center electrode, an inner surface of the insulator, and an inner surface of the orifice electrode. In the plasma jet plug, a shortest path length D1 of a surface path is greater than or equal to 5 times an aerial gap G, where the surface path extends, inside the cavity, from a surface of the center electrode via an inner surface of the insulator to an inner surface of the orifice electrode, and the aerial gap G is a shortest distance between the center electrode and the orifice electrode.
    Type: Application
    Filed: February 3, 2016
    Publication date: February 8, 2018
    Applicant: NGK Spark Plug Co., LTD.
    Inventors: Naoyuki MUKOYAMA, Hiroyuki KAMEDA, Daisuke KASAHARA
  • Publication number: 20180019578
    Abstract: A spark plug having an insulator with a front end portion having an annular groove opened to a front side around an axial line. The groove has a width of greater than or equal to 0.2 mm in a radial direction. In a cross section including the axial line, a value D/L obtained by dividing, by a length L, a creepage distance D, from a position P on the frontmost side of a region in which a clearance distance between an outer surface of a front end portion and an inner circumferential surface of a metal shell is less than or equal to 0.1 mm to a connection position between an outer surface of the front end portion and the axial hole, is greater than or equal to 1.1.
    Type: Application
    Filed: June 22, 2017
    Publication date: January 18, 2018
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Naoyuki MUKOYAMA, Hiroyuki KAMEDA
  • Patent number: 9775227
    Abstract: A non-thermal equilibrium plasma ignition plug including a tubular metallic shell having an axial hole extending along an axial line, an insulator disposed in such a manner as to form a gap in cooperation with a wall surface of the axial hole at a forward end portion of the metallic shell, and a center electrode held at the center of the insulator, and generates nonequilibrium plasma in response to voltage applied thereto from a power supply. The insulator has a plurality of depressions or protrusions formed on a surface thereof which faces a discharge space therearound.
    Type: Grant
    Filed: November 23, 2015
    Date of Patent: September 26, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Kenji Ban, Hiroyuki Kameda, Kohei Usami
  • Patent number: 9478947
    Abstract: A plasma jet plug has a cavity defined by a surface of a center electrode, an inner surface of an insulator, and a surface of a ground electrode. When a volume of a portion of the cavity on a front side of a front portion of the center electrode is a first volume V1 and a volume of a portion of the cavity on a rear side of the front end of the center electrode is a second volume V2, the following expression is satisfied: V1/V2?0.20.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: October 25, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Naoyuki Mukoyama, Hiroyuki Kameda, Daisuke Kasahara
  • Patent number: 9466952
    Abstract: A spark plug having an insulator, a metallic shell disposed around the insulator, a first ground electrode having a first surface facing a side surface of a center electrode in a radial direction so as to form a first gap, and a second ground electrode having a second surface facing the side surface of the center electrode in the radial direction so as to form a second gap. A relation 60°???150° is satisfied, where ? is a smaller one of angles formed between a first line connecting an axial line of the center electrode and the center of the first surface and a second line connecting the axis and a center of the second surface when viewed from a forward end side toward a rear end side in the direction of the axis.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: October 11, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventor: Hiroyuki Kameda
  • Patent number: 9420137
    Abstract: An image-reading apparatus according to the present invention reads one or more documents to acquire a read image, detects edge coordinates of a document image closest to an outer edge of the read image in a plurality of certain directions, and regionally divides the read image in the certain directions based on any one or both of a region of the read image in which no edge coordinates are detected and the edge coordinates of an edge end of the detected document image.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: August 16, 2016
    Assignee: PFU LIMITED
    Inventors: Kiyoto Kosaka, Kazuaki Umi, Hiroyuki Kameda
  • Publication number: 20160157332
    Abstract: A non-thermal equilibrium plasma ignition plug including a tubular metallic shell having an axial hole extending along an axial line, an insulator disposed in such a manner as to form a gap in cooperation with a wall surface of the axial hole at a forward end portion of the metallic shell, and a center electrode held at the center of the insulator, and generates nonequilibrium plasma in response to voltage applied thereto from a power supply. The insulator has a plurality of depressions or protrusions formed on a surface thereof which faces a discharge space therearound.
    Type: Application
    Filed: November 23, 2015
    Publication date: June 2, 2016
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Kenji BAN, Hiroyuki KAMEDA, Kohei USAMI
  • Publication number: 20160028214
    Abstract: A plasma jet plug has a cavity defined by a surface of a center electrode, an inner surface of an insulator, and a surface of a ground electrode. When a volume of a portion of the cavity on a front side of a front portion of the center electrode is a first volume V1 and a volume of a portion of the cavity on a rear side of the front end of the center electrode is a second volume V2, the following expression is satisfied: V1/V2?0.20.
    Type: Application
    Filed: July 28, 2015
    Publication date: January 28, 2016
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Naoyuki MUKOYAMA, Hiroyuki KAMEDA, Daisuke KASAHARA
  • Publication number: 20150340845
    Abstract: A spark plug having an insulator, a metallic shell disposed around the insulator, a first ground electrode having a first surface facing a side surface of a center electrode in a radial direction so as to form a first gap, and a second ground electrode having a second surface facing the side surface of the center electrode in the radial direction so as to form a second gap. A relation 60°???150° is satisfied, where ? is a smaller one of angles formed between a first line connecting an axial line of the center electrode and the center of the first surface and a second line connecting the axis and a center of the second surface when viewed from a forward end side toward a rear end side in the direction of the axis.
    Type: Application
    Filed: May 22, 2015
    Publication date: November 26, 2015
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventor: Hiroyuki KAMEDA
  • Patent number: 9133812
    Abstract: An ignition apparatus which facilitates improvement in energy efficiency as well as materializing an excellent ignitability through effectively utilizing energy used for inductive discharge as a blowout power. The ignition apparatus is used for an ignition plug that includes a center electrode, a ground electrode and a cavity surrounding at least a portion of a clearance formed between the two electrodes to thereby form a discharge space. The ignition apparatus includes a voltage application portion which applies voltage to the clearance and a power supply portion which supplies electric power to the clearance. In addition, a capacitance portion for storing a capacitance is provided, in parallel with the ignition plug, in a voltage application path of the voltage application portion.
    Type: Grant
    Filed: December 26, 2011
    Date of Patent: September 15, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventor: Hiroyuki Kameda
  • Publication number: 20150256697
    Abstract: An image-reading apparatus according to the present invention reads one or more documents to acquire a read image, detects edge coordinates of a document image closest to an outer edge of the read image in a plurality of certain directions, and regionally divides the read image in the certain directions based on any one or both of a region of the read image in which no edge coordinates are detected and the edge coordinates of an edge end of the detected document image.
    Type: Application
    Filed: June 18, 2014
    Publication date: September 10, 2015
    Inventors: Kiyoto KOSAKA, Kazuaki UMI, Hiroyuki KAMEDA
  • Patent number: 9016253
    Abstract: There is provided a spark plug for an internal combustion engine, including: a center electrode extending in the direction of an axis of the spark plug and having a core of higher thermal expansion coefficient than that of a front end thereof, the center electrode including a flanged portion radially outwardly protruding on a rear side thereof and a cylindrical portion located closer to a front end of the spark plug than the flanged portion and being smaller in diameter than the flanged portion; an insulator having an axial hole in the direction of the axis to retain the flanged portion in the axial hole with the cylindrical portion held in a loose-fit state in the axial hole; and a metal shell accommodating the insulator, wherein the spark plug satisfies the following condition: Cb<Cf where Cb is a difference between an inner diameter of the axial hole and an outer diameter of the cylindrical portion at an arbitrary axial position B in the direction of the axis; and Cf is a difference between the inner di
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: April 28, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kaori Kishimoto, Katsutoshi Nakayama, Hiroyuki Kameda, Tomoaki Aoki
  • Patent number: 8987990
    Abstract: A plasma jet spark plug having increased capacitive discharge current, and thus improved plasma generation efficiency. The plasma jet spark plug includes an insulating body having an axial hole, a center electrode, a metal shell, and a cavity portion formed by the inner peripheral surface of the insulating body and the leading end face of the center electrode. A conductive layer formed from a conductive material is provided on at least one portion of at least one of: (a) a surface on the insulating body outer peripheral surface opposed to the inner peripheral surface of the metal shell, the conductive layer electrically connected to a ground electrode; and (b) a surface on the insulating body inner peripheral surface opposed to the outer peripheral surface of the center electrode, the conductive layer electrically connected to the center electrode.
    Type: Grant
    Filed: February 15, 2012
    Date of Patent: March 24, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroyuki Kameda, Daisuke Nakano, Naofumi Yamamura
  • Patent number: 8853929
    Abstract: An ignition plug providing excellent ignition performance that can be maintained over a long period of time by restraining channeling. The ignition plug includes a ceramic insulator having an axial bore, a center electrode inserted into the axial bore, a metallic shell, and a ground electrode fixed to the metallic shell, and has a cavity defined by an inner circumferential surface of the axial bore and the forward end surface of the center electrode. The axial bore includes a first straight portion and a diameter-reducing portion. As viewed on a section which contains an axis (CL1) of the ignition plug, a relational expression ??10 is satisfied, where ? (°) is an acute angle formed by a straight line orthogonal to the axis (CL1) and the outline of the diameter-reducing portion.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: October 7, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroyuki Kameda, Daisuke Nakano, Naofumi Yamamura, Daisuke Kasahara, Yoshikuni Sato
  • Patent number: 8847494
    Abstract: An ignition system for a plasma jet ignition plug that enables a reduction in production cost and provides excellent ignition performance through improvement of plasma formation efficiency. The ignition system includes a plasma jet ignition plug having a center electrode, a ground electrode, and a cavity surrounding at least a portion of a gap formed between the center electrode and the ground electrode to form a discharge space, and a voltage application section for applying voltage across the gap. The ignition system further includes a capacitance section having a capacitance and provided in parallel with the plasma jet ignition plug between the plasma jet ignition plug and the voltage application section.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: September 30, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroyuki Kameda, Daisuke Nakano
  • Patent number: 8736917
    Abstract: An overhead image-reading apparatus includes a one-dimensional image sensor having imaging elements arranged in parallel to each other and is configured to change an angle between an optical axis of a light source and a medium to be read during reading of the medium, and the apparatus includes a correcting unit that corrects distortion in a main-scanning direction in read image data of the medium read by the apparatus.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: May 27, 2014
    Assignee: PFU Limited
    Inventors: Ikuo Murata, Naofumi Kado, Hiroyuki Kameda
  • Patent number: 8640666
    Abstract: A spark plug includes a center electrode extending along an axial line, a ground electrode, and a noble metal tip. A center axis of the noble metal tip is displaced from a center axis of the ground electrode toward a base-end side in the axial line. The ground electrode includes an outer layer and an inner layer, and a distal end of the inner layer is closer to the axial line than a base end of the ground electrode. An overlap area between the inner layer and the noble metal tip occupies a ratio of 25% or more in a projective plane defined by projecting, along the center axis, a plane of the ground electrode viewed from a distal-end face on a cross section of the ground electrode in which a maximum cross-sectional area of the inner layer is achieved, among cross sections orthogonal to the center axis.
    Type: Grant
    Filed: December 25, 2008
    Date of Patent: February 4, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroyuki Kameda, Katsutoshi Nakayama, Kaori Kishimoto, Tomoaki Kato