Patents by Inventor Takehiro Oba

Takehiro Oba 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: 20210132016
    Abstract: A gas sensor includes a gas sensor element for detecting the concentration of a specific gas in a gas under measurement, a tubular housing having an opening, a sealing member closing the opening, and a heat dissipating member having a rear end located at the same position or forward of the rear end of the housing. The heat dissipating member reduces heat transferred from the forward end side of the gas sensor to the sealing member and includes a connection portion connected to the housing, and a main portion extending rearward from the connection portion such that a gap is formed between the main portion and the housing. The main portion has heat dissipating openings for establishing communication between the gap and a space on the outer circumferential side of the heat dissipating member. The heat dissipating openings are formed on the rear end side of the main portion.
    Type: Application
    Filed: October 20, 2020
    Publication date: May 6, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Daisuke MATSUYAMA, Masahiro ASAI, Masashi NOMURA, Yuto INOSE, Takehiro Oba
  • Patent number: 10989686
    Abstract: A gas sensor includes a sensor element, metal terminals, a tubular separator holding the metal terminals, lead wires connected to rear ends of the metal terminals, and an elastic member that holds the lead wires extending rearward from the separator. Each metal terminal includes a forward end portion electrically connected to an electrode portion, a central portion, and a lead wire connection portion. The forward end portion or the central portion is held by the separator. The central portion and the lead wire connection portion are connected to each other through a neck portion. The rearward-facing rearmost surface of the central portion is engaged with a forward-facing surface of the separator, and the circumferential length of a first connection portion between the central portion and the neck portion is longer than the circumferential length of a second connection portion between the lead wire connection portion and the neck portion.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: April 27, 2021
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Shunya Mihara, Takehiro Oba
  • Publication number: 20210072177
    Abstract: A gas sensor including: a sensor element extending in an axial direction; a metal shell surrounding and supporting the sensor element; an exterior tube that is tubular and is mounted to a rear end of the metal shell; a metal terminal including a first end connected to a lead wire and a second end electrically connected to the sensor element; a separator that is tubular and is disposed in the exterior tube and contains the metal terminal and the sensor element; and a holder being in contact with the separator in the axial direction. The holder includes ribs formed in a frontward face or a rearward face of the holder and arranged at predetermined intervals in a circumferential direction. Each of the ribs occupies a region having a length equal to or greater than a thickness of the holder, as viewed in the axial direction.
    Type: Application
    Filed: February 8, 2019
    Publication date: March 11, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Masana OKAI, Takehiro OBA, Daisuke TAHIRA, Masashi NOMURA
  • Publication number: 20210041393
    Abstract: A sensor (1) comprising: a sensor element (10); metal terminals; and a front side separator (90) and a rear side separator (95) to hold the metal terminals, the metal terminals each include a front side metal terminal (30) and a rear side metal terminal (40) respectively held by the front side separator and the rear side separator, a first connection portion (33) is provided on a rear side of the front side metal terminal, a second connection portion (43) is provided on a front side of the rear side metal terminal, and an axis P2 of one of the first and the second connection portion, in all of the plurality of metal terminals, is displaced toward a radially outer side of the sensor element relative to an axis P1 of a counterpart thereof, and the first connection portion and the second connection portion are in contact with each other.
    Type: Application
    Filed: August 6, 2020
    Publication date: February 11, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Sunchao LIU, Takehiro OBA
  • Patent number: 10908116
    Abstract: In a circular cross section obtained by cutting a protector along a plane which is orthogonal to an axial direction and passes through gas introduction holes, the gas introduction holes are arranged asymmetrically in the circumferential direction of a circumferential wall of the protector. When the circular cross section is bisected into first and second divisional regions by a straight line which passes through the center of the circular cross section and does not pass through any gas introduction holes, the total opening area of gas introduction holes located in the first divisional region is smaller than the total opening area of gas introduction holes located in the second divisional region.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: February 2, 2021
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Tomoki Fujii, Takehiro Oba
  • Publication number: 20210018462
    Abstract: Disclosed is a manufacturing method of a gas sensor. The gas sensor has a plate-shaped sensor element with at least one pair of electrode pads, a separator disposed around the sensor element, and at least one pair of opposed metal terminals held in an insertion hole of the separator and electrically connected at contact regions thereof to the respective electrode pads. The manufacturing method includes mounting the metal terminals in the insertion hole of the separator with use of a mounting jig. The mounting jig has a flat portion interposed between the contact regions of the metal terminals during the mounting of the metal terminals in the separator so as to prevent contact and entanglement of the opposed metal terminals.
    Type: Application
    Filed: September 30, 2020
    Publication date: January 21, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Takehiro OBA, Tatsuya Okumura
  • Publication number: 20210018461
    Abstract: A gas sensor (1) including a sensor element (10) and a separator (90) having an element hole (90h), as viewed from a particular side which is a forward-end side or a rear-end side. The separator has end surfaces (90e) located farthest in an axial direction toward the particular side, recess regions (90h), (90r1) and (90r2) recessed from the end surfaces, and first regions R1 and second regions R2. First regions R1 are determined by eliminating a region SB occupied by the sensor element from a region SA defined by imaginary short-side lines and the outer edge of the separator. Second regions R2 are determined by eliminating the region SB from a region SC defined by imaginary long-side lines and the outer edge of the separator. A relation of S2/S1?0.5 is satisfied, where S1 is the total area of R1 and R2, and S2 is the total area of the recess regions.
    Type: Application
    Filed: June 25, 2020
    Publication date: January 21, 2021
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Sunchao LIU, Takehiro Oba
  • Patent number: 10890551
    Abstract: A gas sensor includes a sensing element having an electrode pad a metal terminal, and a separator that has insertion holes in which the metal terminal is held. The metal terminal includes a main body and an elastic portion that is integrally connected to the main body and is elastically connected to the electrode pad at a predetermined contact point. The main body includes a front-end-side restricting portion and a rear-end-side restricting portion that restrict the movement of the main body by contacting wall surfaces of the insertion hole when the main body moves in a direction intersecting the direction of an axial line. The contact point is located between the front-end-side restricting portion and the rear-end-side restricting portion in the direction of the axial line. The front-end-side restricting portion and the rear-end-side restricting portion are connected to each other so that a flat board portion is interposed therebetween.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: January 12, 2021
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Takehiro Oba, Shogo Nagata, Shunya Mihara
  • Patent number: 10876995
    Abstract: Disclosed is a manufacturing method of a gas sensor. The gas sensor has a plate-shaped sensor element with at least one pair of electrode pads, a separator disposed around the sensor element, and at least one pair of opposed metal terminals held in an insertion hole of the separator and electrically connected at contact regions thereof to the respective electrode pads. The manufacturing method includes mounting the metal terminals in the insertion hole of the separator with the use of a mounting jig. The mounting jig has a flat portion interposed between the contact regions of the metal terminals during the mounting of the metal terminals in the separator so as to prevent contact and entanglement of the opposed metal terminals.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: December 29, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Takehiro Oba, Tatsuya Okumura
  • Patent number: 10775342
    Abstract: In a circular cross section of a protector obtained by cutting the protector along a plane which is orthogonal to the axial direction and passes through gas introduction holes, one gas introduction hole and another gas introduction hole having an opening area different from that of the one gas introduction hole are arranged along an imaginary line passing through the center of the circular cross section such that the two gas introduction holes are located on opposite sides with respect to the center of the circular cross section.
    Type: Grant
    Filed: October 19, 2018
    Date of Patent: September 15, 2020
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Tomoki Fujii, Takehiro Oba
  • Patent number: 10761048
    Abstract: A metal terminal includes a front-side terminal member and a rear-side terminal member. The front-side terminal member includes a female connection portion, and the rear-side terminal member includes a male connection portion. The female connection portion has an insertion port in which the male connection portion is inserted. The insertion port is formed in a shape that prevents the insertion port and the male connection portion from coming into contact with each other when the male connection portion is inserted therein. The female connection portion includes a terminal contact portion which brings the male connection portion and the female connection portion into contact with each other by pressing the male connection portion toward the female connection portion inside the female connection portion.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: September 1, 2020
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Takehiro Oba, Shogo Nagata, Shunya Mihara
  • Patent number: 10598628
    Abstract: A gas sensor includes a sensor element having electrode pads, metal terminal members connected to the respective electrode pads, separators, and lead wires connected to the rear ends of the metal terminal members. Each metal terminal member has a forward locking portion and a rear locking portion provided at the forward and rear ends, respectively. The separator is composed of a forward separator and a rear separator connected to each other. The forward separator includes a first locking portion having a rearward-facing surface, and the rear separator includes a second locking portion having a forward-facing surface. The metal terminal member is held between the forward separator and the rear separator in a state in which the forward locking portion is in locking engagement with the rearward-facing surface and the rear locking portion is in locking engagement with the forward-facing surface.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: March 24, 2020
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Shogo Nagata, Takehiro Oba, Shunya Mihara, Kenji Masuda
  • Patent number: 10585061
    Abstract: A gas sensor includes a sensing element that includes an electrode pad, a metal terminal, and a separator. The metal terminal includes a lead-wire-connecting portion, a main body, a protruding piece that protrudes from a front-end side, and an elastic portion connected to an end of the protruding piece and to the electrode pad. An area S1 of a first opposed surface of a primary surface facing an insertion hole of the separator is larger than an area S2 of a second opposed surface of a secondary surface facing the insertion hole, and a part of the second opposed surface contacts an inner circumferential surface of the separator forming the insertion hole, and the first opposed surface is separated from the inner circumferential surface, where surfaces of the main body and the protruding piece that are located opposite the elastic portion are the primary surface and the secondary surface.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: March 10, 2020
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Takehiro Oba, Shogo Nagata, Shunya Mihara
  • Patent number: 10520463
    Abstract: An insulating separator of a gas sensor is formed to be dividable into a forward separator having a terminal disposition hole, and a rear separator having four terminal disposition holes. The insulating separator has a ventilation path formed between the forward separator and the rear separator. As a result, moisture and the like which enter the insulating separator from a forward side of the forward separator through the terminal disposition hole can be discharged outward of the insulating separator through the ventilation path. As a result, corrosion of metal terminals caused by entry of moisture can be reduced, whereby transmission of a sensor signal and application of current or voltage through the metal terminals can be appropriately implemented.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: December 31, 2019
    Assignee: NGK Spark Plug Co., LTD.
    Inventors: Takehiro Oba, Shogo Nagata, Shunya Mihara
  • Publication number: 20190285578
    Abstract: A gas sensor includes a sensor element, metal terminals, a tubular separator that holds the metal terminals, lead wires connected to rear ends of the metal terminals, and an elastic member that holds the lead wires extending rearward from the separator. Each metal terminal includes a forward end portion electrically connected to an electrode portion, a central portion, and a lead wire connection portion. The forward end portion or the central portion is held by the separator. The central portion and the lead wire connection portion are connected to each other through a neck portion. The rearward-facing rearmost surface of the central portion is engaged with a forward-facing surface of the separator, and the circumferential length of a first connection portion between the central portion and the neck portion is longer than the circumferential length of a second connection portion between the lead wire connection portion and the neck portion.
    Type: Application
    Filed: March 14, 2019
    Publication date: September 19, 2019
    Applicant: NGK Spark Plug Co., LTD.
    Inventors: Shunya MIHARA, Takehiro OBA
  • Patent number: 10393715
    Abstract: A gas sensor includes a gas sensor element having a detection portion, a metallic shell holding the gas sensor element, and a tubular body made of metal, which is welded in a state of being externally fitted to a front side or a rear side of the metallic shell. In the present invention, the tubular body is tightly fitted to a tapered portion that is provided at an outer surface of the metallic shell and is radially narrowed toward the tubular body. The tubular body is welded at the tapered portion.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: August 27, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Kunihiko Yonezu, Takehiro Oba
  • Patent number: 10371680
    Abstract: A gas sensor is provided with a metal shell protecting member formed of a material superior in heat resistance to a metal shell, whereby a high-temperature measurement target (exhaust gas) is prevented from being in direct contact with a region, of a protector internal region of the metal shell, on the front side relative to a protector opposing surface. That is, in the gas sensor, it is possible to suppress corrosion, due to high temperature, of a region, of the protector internal region of the metal shell, on the front side relative to the protector opposing surface (an inner surface and a front end surface of a protector fixing portion), while the metal shell is formed of a material (SUS430) that can be subjected to working (crimping or the like) accompanied with deformation. Therefore, heat resistance of the entire sensor can be improved.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: August 6, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Makoto Kume, Shingo Ito, Takehiro Oba, Shinya Miyamoto, Suguru Kyoumoto
  • Publication number: 20190128836
    Abstract: In a circular cross section obtained by cutting a protector along a plane which is orthogonal to an axial direction and passes through gas introduction holes, the gas introduction holes are arranged asymmetrically in the circumferential direction of a circumferential wall of the protector. When the circular cross section is bisected into first and second divisional regions by a straight line which passes through the center of the circular cross section and does not pass through any gas introduction holes, the total opening area of gas introduction holes located in the first divisional region is smaller than the total opening area of gas introduction holes located in the second divisional region.
    Type: Application
    Filed: October 19, 2018
    Publication date: May 2, 2019
    Applicant: NGK Spark Plug Co., LTD.
    Inventors: Tomoki FUJII, Takehiro OBA
  • Publication number: 20190128837
    Abstract: In a circular cross section of a protector obtained by cutting the protector along a plane which is orthogonal to the axial direction and passes through gas introduction holes, one gas introduction hole and another gas introduction hole having an opening area different from that of the one gas introduction hole are arranged along an imaginary line passing through the center of the circular cross section such that the two gas introduction holes are located on opposite sides with respect to the center of the circular cross section.
    Type: Application
    Filed: October 19, 2018
    Publication date: May 2, 2019
    Applicant: NGK Spark Plug Co., LTD.
    Inventors: Tomoki FUJII, Takehiro OBA
  • Patent number: 10203301
    Abstract: A gas sensor includes a sensor element having an electrode pad and a metal terminal member including a forward metal terminal member connected to the electrode pad, and a rear metal terminal member connected to the forward metal terminal member and a lead wire. The rear metal terminal member includes a forward end portion, a central portion, and a lead-wire connection portion. The forward end portion and the central portion are integrally connected through a first neck portion smaller in sectional area than the forward end portion and the central portion. The central portion and the lead-wire connection portion are integrally connected through a second neck portion smaller in sectional area than the central portion and the lead-wire connection portion. The first neck portion is greater in moment of inertia of area than the second neck portion.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: February 12, 2019
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Shunya Mihara, Takehiro Oba, Shogo Nagata