公开(公告)号：US20210158997A1

公开(公告)日：2021-05-27

申请号：US17052684

申请日：2019-05-08

Applicant: KOA CORPORATION

Inventor： Tamotsu ENDO

IPC: H01C1/01 ,  H01C1/14 ,  H01C13/00 ,  G01K7/18

Abstract: Provided is a shunt resistor mount structure comprising: a shunt resistor including a pair of electrodes and a resistive body; a current detecting substrate having a control circuit mounted thereon, the substrate having a voltage detecting portion to which a pair of voltage detection terminals of the shunt resistor are connected; and a temperature sensor for measuring a temperature of the electrodes.

公开(公告)号：US20210041409A1

公开(公告)日：2021-02-11

申请号：US16966203

申请日：2019-01-30

Applicant: KOA CORPORATION ,  NAGAOKA UNIVERSITY OF TECHNOLOGY

Inventor： Tomoichiro OKAMOTO ,  Kenichi IGUCHI ,  Ken TAKAHASHI ,  Tetsuro TANAKA ,  Chika ITO

IPC: G01N33/00 ,  G01N27/409 ,  G01N27/407 ,  C04B35/45

Abstract: An oxygen sensor element made of a ceramic sintered body detects oxygen concentration based on an electric current value measured when a voltage is applied. The ceramic sintered body has a composition formula LnBa2-xSrxCu3O7-δ generated by substituting any element selected from group 2 elements in the periodic table, such as strontium (Sr), for a part of a composition formula LnBa2Cu3O7-δ (Ln denotes rare earth element and δ is 0 to 1). Sr substitution quantity x should satisfy an inequality constraint 0

公开(公告)号：US10896775B2

公开(公告)日：2021-01-19

申请号：US16083004

申请日：2017-02-20

Applicant: KOA CORPORATION

Inventor： Masaki Miyagawa ,  Kyohei Miyashita ,  Hiroshi Sakai ,  Hidekazu Karasawa ,  Takashi Ito

IPC: H01C1/142 ,  H01C7/00 ,  H01C1/028

Abstract: A resistor has a structure including a resistor substrate that has paired electrodes and a resistive element formed on an insulating substrate, an insulating exterior material that covers at least the upper and the side surface of the resistor substrate, and harness electric wires that have one end parts connected to the respective electrodes, pass through the exterior material, and extend outside. The paired electrodes are formed on areas other than the end parts of the insulating substrate, and junctions of the end parts of the harness electric wires and the paired electrodes are at positions where creepage distance of insulation from the junctions to the bottom ends of the insulating substrate is a predetermined distance or longer. Such structure provides the resistor having a secured creepage distance of insulation between the conductor parts of the resistor and the metal case in which the resistor is installed.

公开(公告)号：US20210010963A1

公开(公告)日：2021-01-14

申请号：US17040278

申请日：2019-03-20

Applicant: KOA CORPORATION

Inventor： Tetsuro TANAKA ,  Kenichi IGUCHI ,  Ken TAKAHASHI ,  Chika ITO

IPC: G01N27/12 ,  G01N33/00 ,  B28B1/48 ,  B28B1/30

Abstract: A sensor element has a cross-sectional area that increases either uniformly or gradually from a positive (+) electrode side toward a negative (−) electrode side, thereby leading a hot spot, which attempts to move to the negative electrode side, to a lower resistance side. A position that is at nearly equal distances from paired electrodes formed on either end of the sensor element is set as a hot spot generating position, so as to avoid damage to the electrodes due to heat emitted by the hot spot.

公开(公告)号：US10690606B2

公开(公告)日：2020-06-23

申请号：US15759343

申请日：2016-09-16

Applicant: KOA CORPORATION

Inventor： Toshitsugu Ueda ,  Hiroshi Oigawa

IPC: G01N25/22 ,  G01N33/00

Abstract: In order to provide a hydrogen sensor for measuring a hydrogen concentration with high sensitivity and excellent mass-productivity, the hydrogen sensor includes: at least a first quartz vibrator and a second quartz vibrator formed in a quartz plate; a hydrogen reaction catalytic layer including a platinum film of platinum black formed on both sides of the first quartz vibrator; and a hydrogen non-reactive layer formed in the second quartz vibrator, wherein a hydrogen concentration is measured by measuring a temperature of the first quartz vibrator increasing by heat of combustion caused by oxidization of hydrogen by the hydrogen reaction catalytic layer as a change of a natural frequency of the first quartz vibrator with respect to a natural frequency of the second quartz vibrator.

公开(公告)号：US10564188B2

公开(公告)日：2020-02-18

申请号：US15739022

申请日：2016-06-14

Applicant: KOA CORPORATION

Inventor： Kenji Kameko ,  Kosuke Arai

IPC: G01R1/06 ,  G01R19/00 ,  G01R1/067 ,  G01R3/00 ,  G01R19/155 ,  G01R31/382

Abstract: Provided is a current sensing device including an electrical conductor made of electrically conductive metal; and voltage sensing terminals provided on the electrical conductor. Each voltage sensing terminal is formed by inserting bar-like metal into a through-hole formed in the electrical conductor, and the voltage sensing terminal includes a first terminal portion that is stored in the through-hole and a second terminal portion that protrudes from the through-hole.

公开(公告)号：US20190324058A1

公开(公告)日：2019-10-24

申请号：US16317437

申请日：2017-06-07

Applicant: KOA CORPORATION

Inventor： Tamotsu ENDO ,  Ryo OSAWA

IPC: G01R1/20 ,  G01R31/28

Abstract: Provided is a current measuring device including a first wire member formed of a conductive metal and a second wire member formed of a conductive metal, the second wire member partially including a resistive element metal, in which the first wire member and the second wire member are arranged in parallel with an insulator sandwiched therebetween in a portion where at least the resistive element metal is present.

公开(公告)号：US20190322588A1

公开(公告)日：2019-10-24

申请号：US16467624

申请日：2017-12-07

Applicant: KOA CORPORATION ,  JFE MINERAL COMPANY, LTD.

Inventor： Yoji GOMI ,  Kenichi IGUCHI ,  Etsurou UDAGAWA ,  Yuko ECHIZENYA ,  Yoshimi NAKATA

IPC: C04B35/453 ,  C01G9/02 ,  H01C7/12

Abstract: Focus is on zinc oxide itself, which is a base material for a zinc oxide varistor (laminated varistor), wherein specified quantities of additives are added to a zinc oxide powder having a crystallite size of 20 to 50 nm, grain diameter of 15 to 60 nm found using the specific surface area BET method, untamped density of 0.38 to 0.50 g/cm3, and tap density of 0.50 to 1.00 g/cm3. This allows securing of uniformity, high compactness, and high electrical conductivity of a zinc oxide sintered body, and provision of a zinc oxide varistor having high surge resistance.

公开(公告)号：US10446304B2

公开(公告)日：2019-10-15

申请号：US15516025

申请日：2015-07-22

Applicant: KOA Corporation

Inventor： Naoto Oka ,  Homare Sasaki

IPC: B23K26/00 ,  B23K26/08 ,  H01C17/242 ,  B23K26/351 ,  H01C17/00

Abstract: The invention is to provide a resistor trimming method capable of adjusting a resistance value with ultrahigh precision and having excellent production efficiency. To achieve the object, a start point (S1) at a distance from a resistor (4) is irradiated with laser light while probes are brought into contact with a pair of surface electrodes (3) to measure a resistance value of the resistor (4). The place irradiated with the laser light is scanned so that a first trimming groove (5) extending in a direction perpendicular to a current direction can be formed in the resistor (4). Then, the place irradiated with the laser light is returned by a predetermined amount from an end point (first turning point (T1)) of the first trimming groove (5) to be set as a second turning point (T2). With the second turning point (T2) as a start point, scanning and cutting is performed to forma second trimming groove (6). Thus, the resistance value of the resistor (4) is adjusted to a target resistance value with high precision.

公开(公告)号：US10446297B2

公开(公告)日：2019-10-15

申请号：US16083088

申请日：2017-02-20

Applicant: KOA CORPORATION

Inventor： Masaki Miyagawa ,  Kyohei Miyashita ,  Hiroshi Sakai

IPC: H01C1/14 ,  H01C1/148 ,  H01R4/18 ,  H01C7/00 ,  H01R11/12

Abstract: A power resistor has paired harness electric wires that have one end parts connected to a resistor substrate, and other end parts pass through an exterior material made of insulating resin and extend outward. Crimp terminals, which are means for reinforcing affinity between the coating material of the harness electric wires and the insulating resin, i.e., the exterior material and for maintaining adhesion, are formed on predetermined portions of the harness electric wires. As a result, a short and small power resistor suitable for an in-vehicle environment is provided.