Patents Assigned to KOA Corporation
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Patent number: 12249448Abstract: A resistor is provided with a resistance body and a pair of electrodes connected to the resistance body (a first electrode body, a second electrode body), the resistance body being arranged so as to be at least separated away from a substrate board (a circuit board) when mounted on the substrate board (the circuit board), wherein the resistor has the oxide film on at least one of the resistance body and each of the electrodes (the first electrode body, the second electrode body) at a boundary portion (a bonded portion, a bonded portion) between the resistance body and each of the electrodes (the first electrode body, the second electrode body) on the mounting surface of the resistor.Type: GrantFiled: December 28, 2020Date of Patent: March 11, 2025Assignee: KOA CorporationInventors: Kohji Eto, Yohei Tokiwa, Reina Kaneko, Jumpei Yamamoto
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Patent number: 12241852Abstract: The gas sensor is provided with: a base material; a first electrode and a second electrode arranged on the base material; and a gas detection member connected to the first electrode and the second electrode, wherein the gas detection member contains flaky particles of alkaline earth ferrite.Type: GrantFiled: August 26, 2020Date of Patent: March 4, 2025Assignees: National Institute of Technology, KOA CorporationInventors: Shigenori Matsushima, Kenji Obata, Kenichi Iguchi, Yukiko Ota, Hisakazu Nagata, Koichi Urano
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Patent number: 12241914Abstract: A current sensing device including: an insulating resin substrate; a current sensing element arranged in the resin substrate; a current wire provided via an insulating layer with respect to the current sensing element to flow a current through the current sensing element; a plurality of current vias connecting the current sensing element and the current wire through the insulating layer; and a voltage sensing via connected to the current sensing element to measure a voltage drop.Type: GrantFiled: December 28, 2020Date of Patent: March 4, 2025Assignee: KOA CorporationInventor: Miyahito Kinoshita
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Patent number: 12243667Abstract: A manufacturing method of a resistor contains: a step of forming a resistor base material by stacking an electrode material, a resistive material, and an electrode material in this order and by bonding the electrode material, the resistive material, and the electrode material by applying pressure in the stacked direction; a step of passing the resistor base material through a die, the die being formed with an opening portion having a dimension smaller than an outer dimension of the resistor base material; and a step of obtaining an individual resistor from the resistor base material passed through the die.Type: GrantFiled: December 25, 2020Date of Patent: March 4, 2025Assignee: KOA CorporationInventors: Yohei Tokiwa, Kohji Eto, Tomofumi Noguchi, Reina Kaneko
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Patent number: 12188835Abstract: A load sensor element includes a substrate made of a ceramic material; an inorganic layer having a surface configured to receive a load, the inorganic layer covers a portion of the substrate; a thin-layer resistance body whose resistance value changes in accordance with the load received by the inorganic layer, the thin-layer resistance body having a main body portion and a pair of end portions, the main body portion mounted on the covered portion of the substrate and sandwiched between the substrate and the inorganic layer, the pair of end portions mounted on an exposed portion of the substrate, and the exposed portion free of the inorganic layer; and a pair of electrodes electrically connected to the pair of end portions of the thin-layer resistance body and separated away from the inorganic layer and on one side of the substrate.Type: GrantFiled: August 19, 2020Date of Patent: January 7, 2025Assignees: KOA Corporation, NTN CorporationInventors: Homare Kaneko, Natsumi Shiobara, Koichi Urano, Yusuke Shibuya, Daichi Kondou
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Patent number: 12087480Abstract: The resistive material contains copper and manganese, an oxide film of manganese being formed on a surface of the resistive material.Type: GrantFiled: August 6, 2020Date of Patent: September 10, 2024Assignee: KOA CorporationInventors: Reina Kaneko, Yoshitaka Kumeda, Tadahiko Yoshioka
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Patent number: 12055503Abstract: A thermal analysis model includes an intermediate node that imitates an intermediate portion and a first thermal resistance connecting to the intermediate node, and imitates the terminal portions on both sides. A terminal portion inside node connected to the first thermal resistance is configured to imitate an inside area adjacent to the intermediate portion and serves as a starting point of a first heat dissipation path to the substrate. A terminal outside node is configured to imitate an outside area separated from the intermediate portion and adjacent to the inside area in the terminal portions and serves as a starting point of a second heat dissipation path to the substrate. A second thermal resistance connects the terminal portion inside node and the terminal portion outside node and is arranged parallel to a different element imitating a thermal resistance of an electrode layer in a surface of the substrate.Type: GrantFiled: January 18, 2019Date of Patent: August 6, 2024Assignee: KOA CorporationInventors: Hirotoshi Aoki, Koichi Hirasawa
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Patent number: 12037507Abstract: This invention provides a resin composition for preparing an allylphenol-maleimide copolymer used for a protective film for an electronic component including: (A) an allyl group-containing phenol compound having a rigid structure; (B) an N-aromatic maleimide group-containing compound having a rigid structure; and (C) an N-aliphatic maleimide group-containing compound having a flexible structure.Type: GrantFiled: November 5, 2019Date of Patent: July 16, 2024Assignees: Osaka Research Institute of Industrial Science and Technology, KOA CorporationInventors: Keiko Ohtsuka, Morio Yonekawa, Hajime Kimura, Ken Yoshioka, Nobuhiro Kanamaru, Masaki Suwa, Kazumi Machida
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Patent number: 11977042Abstract: An oxygen sensor for detecting gas concentration based on either an electric current value or a resistance value measured when a voltage is applied to a sensor element includes gaps formed between electrodes arranged in an element main body and ridges where surfaces of an element touch each other. These gaps will be escaping parts for expansion and contraction of electrode material that accompany thermal expansion and contraction of a sensor main body, and concentration of thermal stress at edge parts of the element main body may thus be eliminated, thereby alleviating thermal stress on the oxygen sensor. This allows provision of a gas sensor that controls generation of cracks in the element and that is stably usable over a long period of time.Type: GrantFiled: March 20, 2019Date of Patent: May 7, 2024Assignee: KOA CorporationInventors: Chika Ito, Ken Takahashi, Tetsuro Tanaka, Kenichi Iguchi
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Patent number: 11965228Abstract: The resistive material for sensing current contains: metal particles selected from a group consisting of nichrome, copper-manganese, and copper-nickel; insulating particles selected from a group consisting of alumina, aluminum nitride, silicon nitride, and zirconia; and titanium oxide.Type: GrantFiled: March 3, 2020Date of Patent: April 23, 2024Assignee: KOA CorporationInventors: Shuhei Matsubara, Keishi Nakamura
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Patent number: 11842830Abstract: A shunt resistor 10, 110 includes a flat resistive element 11; a first electrode block 12 that is made of a conductive metal material and is laminated on a lower surface 11a of the resistive element 11; and a second electrode block 13, 113 that is made of a conductive metal material and is laminated on an upper surface 11b of the resistive element 11, in which the second electrode block 13, 113 is a block body including an electrode portion 14 connected to the resistive element 11 and an extension portion 15, 115 extending downward from a side surface of the electrode portion 14.Type: GrantFiled: March 3, 2020Date of Patent: December 12, 2023Assignee: KOA CorporationInventors: Susumu Toyoda, Shuhei Matsubara, Keishi Nakamura
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Publication number: 20230146171Abstract: A manufacturing method of a resistor contains: a step of forming a resistor base material by stacking an electrode material, a resistive material, and an electrode material in this order and by bonding the electrode material, the resistive material, and the electrode material by applying pressure in the stacked direction; a step of passing the resistor base material through a die, the die being formed with an opening portion having a dimension smaller than an outer dimension of the resistor base material; and a step of obtaining an individual resistor from the resistor base material passed through the die.Type: ApplicationFiled: December 25, 2020Publication date: May 11, 2023Applicant: KOA CorporationInventors: Yohei TOKIWA, Kohji ETO, Tomofumi NOGUCHI, Reina KANEKO
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Patent number: 11626219Abstract: A glass protective film 4 is formed such that boundaries of top surface electrodes 3a and 3b do not exist at the base of corner portions of the rectangular glass protective film 4 so as to eliminate level differences generating due to thicknesses of the electrodes. Use of such a structure may resolve the problem that when printing glass paste individually over chip elements of a chip resistor on a large substrate from which multiple chips will be obtained, corner portions of the glass protective film bleed (flow) to the outer side (dividing grooves).Type: GrantFiled: January 26, 2022Date of Patent: April 11, 2023Assignee: KOA CorporationInventor: Kazuhisa Ushiyama
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Patent number: 11600411Abstract: A terminal connecting structure is provided with each of the electrodes provided on the element forming the electronic component; and the terminals respectively having the connecting portions arranged along the electrodes respectively. In addition, the terminal connecting structure is provided with clearance forming portions configured to respectively form the respective clearances between the electrodes and the connecting portions respectively; and the connecting materials respectively provided in the clearances, the connecting material being configured to electrically connect the connecting portions and the electrodes respectively.Type: GrantFiled: September 14, 2021Date of Patent: March 7, 2023Assignee: KOA CorporationInventor: Isao Tonouchi
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Publication number: 20230040566Abstract: A resistor contains a resistance body and a pair of electrodes (a first electrode body and a second electrode body), wherein end surfaces of the resistance body are respectively abutted to and bonded to end surfaces of the electrodes (a first electrode body and a second electrode body), the electrodes (a first electrode body and a second electrode body) each includes a main body portion and a leg portion, the leg portion protruding from the main body portion in the mounting surface of the resister, and a length dimension of the resistor is equal to or shorter than 3.2 mm.Type: ApplicationFiled: December 28, 2020Publication date: February 9, 2023Applicant: KOA CorporationInventors: Yohei TOKIWA, Kohji ETO, Tomofumi NOGUCHI, Reina KANEKO
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Publication number: 20230040165Abstract: A resistor is provided with a resistance body and a pair of electrodes connected to the resistance body (a first electrode body, a second electrode body), the resistance body being arranged so as to be at least separated away from a substrate board (a circuit board) when mounted on the substrate board (the circuit board), wherein the resistor has the oxide film on at least one of the resistance body and each of the electrodes (the first electrode body, the second electrode body) at a boundary portion (a bonded portion, a bonded portion) between the resistance body and each of the electrodes (the first electrode body, the second electrode body) on the mounting surface of the resistor.Type: ApplicationFiled: December 28, 2020Publication date: February 9, 2023Applicant: KOA CorporationInventors: Kohji ETO, Yohei TOKIWA, Reina KANEKO, Jumpei YAMAMOTO
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Patent number: 11495374Abstract: A resistive material for sensing current contains particles having an electrically insulating property and a metal body having a three-dimensional network enclosing the particles, and a ratio of the metal body to the whole of the resistive material is 30 vol % or more and 80 vol % or less.Type: GrantFiled: August 2, 2019Date of Patent: November 8, 2022Assignee: KOA CorporationInventors: Shuhei Matsubara, Keishi Nakamura
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Patent number: 11443877Abstract: A strain sensor resistor includes: a resistive element (thin-film strain-resistive layer) formed nearly at the center of an upper surface of an insulation substrate to be a base; and front surface electrodes layered and formed on either end part of the resistive element and electrically connected to the resistive element. The entire upper part of the resistive element and a part of the front surface electrodes are covered by a protective film (protective coating). Moreover, back surface electrodes electrically connected to the front surface electrodes are formed on either lower end part of the insulation substrate, and end surface electrodes are formed on either longitudinal end surface of the insulation substrate. The strain sensor resistor has a tip shape solder mountable on a circuit board etc. using the back surface electrodes.Type: GrantFiled: September 17, 2019Date of Patent: September 13, 2022Assignee: KOA CorporationInventors: Homare Kaneko, Natsumi Shiobara, Yasushi Hiroshima
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Patent number: 11370671Abstract: Focusing on zinc oxide itself, which is a main raw material for a zinc oxide varistor (laminated varistor), a predetermined amount of additive is added to a zinc oxide powder having crystallite size of 20 to 100 nm, particle diameter of 20 to 110 nm found using a specific area BET method, untamped density of 0.60 g/cm3 or greater, and tap density of 0.80 g/cm3 or greater. This allows a zinc oxide sintered body to secure uniformity, high density, and high electric conductivity, resulting in a zinc oxide varistor with high surge resistance, capable of downsizing and cost reduction. Moreover, addition of aluminum (Al), as a donor element, to the zinc oxide powder allows control of sintered grain size in conformity with the aluminum added amount and baking temperature, and also allows adjustment of varistor voltage, etc.Type: GrantFiled: June 4, 2019Date of Patent: June 28, 2022Assignees: KOA Corporation, JFE Mineral Company, Ltd.Inventors: Naomi Ishida, Yoji Gomi, Kenichi Iguchi, Etsurou Udagawa, Yuko Echizenya, Yoshimi Nakata
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Patent number: D1013636Type: GrantFiled: June 3, 2021Date of Patent: February 6, 2024Assignee: KOA CorporationInventor: Isao Tonouchi