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公开(公告)号：US12249809B2
公开(公告)日：2025-03-11
申请号：US18616670
申请日：2024-03-26
Applicant: Niterra Co., Ltd.
Inventor： Hiroki Shimada , Haruki Yoshida , Kengo Fujimura , Takuto Koba
IPC: H01T13/38
Abstract: When a force to bend a spark plug insulator is applied to the spark plug insulator to fracture the spark plug insulator, for a range including a starting point of the fracture out of two ranges into which a fracture surface created by the fracture is divided by a plane which is a plane perpendicular to a direction of the force and includes the axial line, an average of areas of particles appearing in a planar image of the range is 4.4 μm2 or larger and 8.0 μm2 or smaller, and a maximum area of the particles is 600 μm2 or smaller. The particles include large particles having an area of 60 μm2 or larger and 600 μm2 or smaller, and, as the large particles, 0.1 particles/mm2 or more are present per unit area of the planar image.
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公开(公告)号：US12249808B2
公开(公告)日：2025-03-11
申请号：US18686680
申请日：2022-08-29
Applicant: NITERRA CO., LTD.
Inventor： Yuki Yoshida , Naoki Nishio
IPC: H01T13/06
Abstract: A spark plug which can increase the reactive force of a shelf part. The spark plug includes a cylindrical metal shell provided around an outer periphery of an insulator. The metal shell includes, on an inner periphery of the metal shell, a proximally oriented surface in contact with the insulator, a distally oriented surface located on the distal side relative to the proximally oriented surface, a first surface extending from the distally oriented surface toward the distal side; and a second surface extending from the proximally oriented surface toward the proximal side. In a section containing an axial line, angle A formed between the distally oriented surface and the first surface and angle B formed between the proximally oriented surface and the second surface have a relationship A≤1.15B, with angle A being greater than or equal to 90° and angle B being greater than or equal to 90°.
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公开(公告)号：US12160089B1
公开(公告)日：2024-12-03
申请号：US18747514
申请日：2024-06-19
Applicant: Niterra Co., Ltd.
Inventor： Kenji Ban , Naoyuki Mukoyama , Kento Kubota
Abstract: A spark plug includes a center electrode includes a base member, a tip and a melted portion. In a projection view formed by projecting the spark plug perpendicularly to an axial line direction, when an angle that is formed by a discharge surface of the tip and a straight line passing through a first boundary between the tip and the melted portion and a second boundary between the melted portion and the base member, the first boundary and the second boundary being located at two ends of an external shape line of the melted portion, expressed by θ, a distance between the first boundary and the discharge surface in the axial line direction expressed by A, and a distance between the first boundary and the second boundary in a direction perpendicular to the axial line expressed by B, 0
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公开(公告)号：US20240396309A1
公开(公告)日：2024-11-28
申请号：US18669762
申请日：2024-05-21
Applicant: Niterra Co., Ltd.
Inventor： Tatsuya GOZAWA
IPC: H01T13/34
Abstract: A spark plug includes: a cylindrical center electrode extending along an axial line; a metal shell that holds the center electrode in an insulated manner; and a ground electrode electrically connected to the metal shell. A spark gap is formed between a side surface of the center electrode and an end face of the ground electrode. The metal shell includes a tubular distal end portion inside which the spark gap is located. In a cross section perpendicular to the axial line and including a center of gravity of the end face, a distance between a center line of the ground electrode, the center line including the center of gravity, and a point of tangency of a tangent line to the side surface of the center electrode is greater than 0 and smaller than a distance between an edge of the end face and the center of gravity.
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公开(公告)号：US20240307919A1
公开(公告)日：2024-09-19
申请号：US18576290
申请日：2022-08-09
Applicant: NITERRA CO., LTD.
Inventor： Toshihito SONOBE , Asuka TSUJII , Ryo SUZUKI , Yuichiro HANAWA , Shinsuke ITOH , Takashi KASASHIMA
IPC: B06B1/06
CPC classification number: B06B1/0648
Abstract: An ultrasonic transducer (1) includes a base portion (14), a piezoelectric element (11), a vibration plate (10), and a resonator (12). The resonator (12) is joined to a first surface (21) of the vibration plate (10). A surface, of the piezoelectric element (11), on a side opposite to a side on which the piezoelectric element is joined to the base portion (14), is joined to a second surface (22) of the vibration plate (10). A through-hole (30) is formed in the piezoelectric element (11) so as to penetrate therethrough in a thickness direction of the vibration plate (10). In a planar direction orthogonal to the thickness direction of the vibration plate (10), a joined portion (40) between the vibration plate (10) and the resonator (12) is located inward of a node (20) of vibration of the vibration plate (10), and the through-hole (30) is located inward of the node (20).
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Patent Agency Ranking
公开(公告)号：US12095235B2
公开(公告)日：2024-09-17
申请号：US18567558
申请日：2022-06-14
Applicant: NITERRA CO., LTD.
Inventor： Shoma Tsumagari , Haruki Yoshida , Hiroki Shimada , Tomoya Kukino , Takuto Koba , Noriyuki Tamura
IPC: H01T13/38
CPC classification number: H01T13/38
Abstract: In a spark plug 1 of the present invention, in a mirror-polished surface 230a obtained by mirror-polishing a cut surface 230 obtained by cutting an insulator 2 in a direction perpendicular to an axial line AX direction, at a position separated by 2 mm from a portion having a maximum diameter of a diameter-enlarged portion 31a to a rear end side along the axial line AX direction, when 20 first observation regions X each being 192 μm×255 μm are set so as to each overlap a reference position m1 being a position 0.2 mm in a radial direction from an inner peripheral surface 2a side of the insulator 2 and so as not to overlap each other, a proportion (porosity) of an area of all of pores included in the 20 first observation regions X relative to a total area (100%) of the 20 first observation regions X is not greater than 3.5%, and in a thermally etched surface 230b obtained by subjecting the mirror-polished surface 230a to thermal etching, when 20 second observation regions Y each being 32 μm×43 μm are set so as to each overlap the reference position m1 and so as not to overlap each other, a particle size distribution of alumina particles included in the 20 second observation regions Y is regarded as a normal distribution, an average particle diameter of the alumina particles is defined as A, and a standard deviation of a particle diameter of the alumina particles is defined as σ, A is not less than 1.9 μm and not greater than 2.8 μm, and (A+3σ) is not greater than 3.0 μm.
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公开(公告)号：US12088067B2
公开(公告)日：2024-09-10
申请号：US18559762
申请日：2022-06-06
Applicant: Niterra Co., Ltd.
Inventor： Susumu Imai , Tatsuya Gozawa
IPC: H01T13/08
CPC classification number: H01T13/08
Abstract: A spark plug includes an insulator having an axial hole, a center electrode disposed in the axial hole and having a forward end portion projecting to a forward end of the axial hole, a tubular metallic shell which holds the insulator on its inner circumference and has a screw portion formed on its outer circumferential surface, and a ground electrode whose first end portion is fixed to a through hole provided in the metallic shell and whose second end portion forms a discharge gap between the second end portion and the forward end portion. The screw portion has a first screw portion located on a rear end of the through hole and a second screw portion located on a forward end of the through hole, and the first screw portion has a pitch diameter larger than that of the second screw portion.
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公开(公告)号：US20240291244A1
公开(公告)日：2024-08-29
申请号：US18571546
申请日：2022-07-12
Applicant: Niterra Co., Ltd.
Inventor： Kaito NAKAMURA , Daisuke SUMOYAMA , Takaaki KIKAI , Kengo HATTORI
IPC: H01T13/39
CPC classification number: H01T13/39
Abstract: A spark plug which is reduced in consumption of a discharge member, thereby having a longer service life. This spark plug is provided with: a first electrode that comprises a discharge member; and a second electrode that faces the discharge member, with a spark gap lying therebetween. The discharge member is mainly composed of Ru, while containing 0.5% by mass to 30% by mass of Ni or Co.
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公开(公告)号：US20240255416A1
公开(公告)日：2024-08-01
申请号：US18560276
申请日：2022-04-26
Applicant: NITERRA CO., LTD.
Inventor： Kazusei TAMAI , Kodai KOJIMA , Yoshiyasu FUJII , Junji KOJIMA , Kenta OGASAWARA , Daiki KUWAHARA , Katsunori YAZAWA
CPC classification number: G01N21/31 , G01N33/18 , G01N2201/0668
Abstract: A water quality sensor includes a light source, a beam splitter, a first detector, a second detector, and a measurement space. The beam splitter splits light emitted from the light source into transmitted light and reflected light. The first detector detects the transmitted light. The second detector detects the reflected light. The measurement space is filled with a sample of liquid. Of an optical path along which light propagates from the light source to the first detector, a portion extending through the measurement space is defined as a first optical path. Of an optical path along which light propagates from the light source to the second detector, a portion extending through the measurement space is defined as a second optical path. The optical path length of the second optical path differs from the optical path length of the first optical path.
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公开(公告)号：US20240244719A1
公开(公告)日：2024-07-18
申请号：US18289478
申请日：2022-05-16
Applicant: NITERRA CO., LTD
Inventor： Keisuke SUZUKI
CPC classification number: H05B3/283 , H05B3/06 , H05B2203/002 , H05B2203/016
Abstract: This heat generating element of a ceramic heater, if viewed from the thickness direction of the ceramic heater, comprises: as a pair of heat generating lines formed from two heat generating lines adjacent to each other of the heat generating element in the radial direction, a pair of first heat generating lines and a pair of a second heat generating lines disposed apart from each other by sandwiching a prescribed separation region therebetween in the circumferential direction of the heating element; a first folded back portion connecting both ends on the separation region side of two of the heat generating lines forming the pair of first heat generating lines; and a second folded back portion connecting both ends on the separation region side of two of the heat generating lines forming the pair of second heat generating lines. At a pair of folded back portions formed from the first folded back portion and the second folded back portion, the spacing of the pair of folded back portions between the first folded back portion and the second folded back portion at the end on one side of the beat generating element in the radial direction is narrower than the spacing of the pair of folded back portions between the first folded back portion and the second folded back portion in the center of the heat generating element in the radial direction.
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