公开(公告)号：US12087480B2

公开(公告)日：2024-09-10

申请号：US17754031

申请日：2020-08-06

Applicant: KOA Corporation

Inventor： Reina Kaneko ,  Yoshitaka Kumeda ,  Tadahiko Yoshioka

IPC: H01C7/13 ,  H01C17/02 ,  H01C17/065

CPC classification number: H01C7/13 ,  H01C17/02 ,  H01C17/06553

Abstract: The resistive material contains copper and manganese, an oxide film of manganese being formed on a surface of the resistive material.

公开(公告)号：US20240258897A1

公开(公告)日：2024-08-01

申请号：US18429141

申请日：2024-01-31

Applicant: National University Corporation Tokai National Higher Education and Research System ,  KOA CORPORATION

Inventor： Yu YONEZAWA ,  Masayoshi YAMAMOTO ,  Atsushi HASENUMA ,  Koji SHIGESAWA ,  Keishi NAKAMURA ,  Susumu TOYODA

IPC: H02M1/00 ,  H02M7/5387 ,  H03F3/45

CPC classification number: H02M1/0009 ,  H02M7/53873 ,  H03F3/45475 ,  H03F2200/261 ,  H03F2200/462

Abstract: A current detection circuit, including: an output circuit to output a signal indicating a voltage drop between a pair of detection terminals; an amplifier circuit to amplify the signal from the output circuit; an AD conversion circuit to generate a digital signal by sampling, at a predetermined cycle, an amplified signal amplified by the amplifier circuit; a filter circuit configured to extract, from the amplified signal amplified by the amplifier circuit, a noise component having a frequency higher than a sampling frequency of the AD conversion circuit; a comparing unit to output a comparison signal indicating a noise detection timing at which an output signal of the filter circuit exceeds a predetermined reference value for detecting the noise component; and an arithmetic circuit to delay a timing at which the amplified signal is sampled by the AD conversion circuit for a predetermined time based on the comparison signal.

公开(公告)号：US12037507B2

公开(公告)日：2024-07-16

申请号：US17287772

申请日：2019-11-05

Applicant: OSAKA RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE AND TECHNOLOGY ,  KOA CORPORATION

Inventor： Keiko Ohtsuka ,  Morio Yonekawa ,  Hajime Kimura ,  Ken Yoshioka ,  Nobuhiro Kanamaru ,  Masaki Suwa ,  Kazumi Machida

IPC: C08K3/22 ,  C08F212/34 ,  C08F234/00 ,  C09D7/61 ,  C09D125/18 ,  C09D145/00 ,  H01B3/30 ,  H01C7/00

CPC classification number: C09D125/18 ,  C08F212/34 ,  C08F234/00 ,  C08K3/22 ,  C09D7/61 ,  C09D145/00 ,  H01B3/303 ,  H01C7/005 ,  C08K2003/2227 ,  C08K3/22 ,  C08L65/00

Abstract: 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.

公开(公告)号：US11965228B2

公开(公告)日：2024-04-23

申请号：US17600968

申请日：2020-03-03

Applicant: KOA CORPORATION

Inventor： Shuhei Matsubara ,  Keishi Nakamura

IPC: C22C29/12 ,  B22F1/12 ,  B22F3/14 ,  C04B35/117 ,  C04B35/64 ,  H01C1/14 ,  H01C7/00 ,  H01C17/065

CPC classification number: C22C29/12 ,  B22F1/12 ,  B22F3/14 ,  C04B35/117 ,  C04B35/64 ,  H01C1/14 ,  H01C7/003 ,  H01C17/06553 ,  B22F2302/25 ,  C04B2235/3217 ,  C04B2235/3232 ,  C04B2235/405 ,  C04B2235/5454 ,  C04B2235/9607

Abstract: 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.

公开(公告)号：US20240049399A1

公开(公告)日：2024-02-08

申请号：US18266722

申请日：2021-12-02

Applicant: KOA CORPORATION

Inventor： Yasushi AKAHANE

IPC: H05K3/34 ,  H01C7/00 ,  H01C1/142 ,  H01C17/28 ,  H01C17/00

CPC classification number: H05K3/3431 ,  H01C7/003 ,  H01C1/142 ,  H01C17/283 ,  H01C17/006

Abstract: A chip resistor according to the present invention includes an insulating substrate, a pair of back surface electrodes, a pair of top surface electrodes, a resistor, and a pair of end face electrodes. The back surface electrode includes the first electrode portion located inwardly and away from the end face of the insulating substrate, and the two second electrode portions arranged on two portions, respectively, in the short direction of the insulating substrate with the cutout portion, which is positioned between the end face of the insulating substrate and the first electrode portion, being interposed therebetween, and the maximum height of the first electrode portion is set to be more than the maximum height of the second electrode portions.

公开(公告)号：US11874245B2

公开(公告)日：2024-01-16

申请号：US17604082

申请日：2020-02-12

Applicant: KOA CORPORATION

Inventor： Taro Kimura

IPC: C25D7/00 ,  G01N27/12 ,  C25D5/02

CPC classification number: G01N27/12 ,  C25D5/028 ,  C25D7/00

Abstract: After a sulfidation detection conductor (2) is formed on a front surface of a large-sized substrate (10A), a pair of first protective films (3) made of an insoluble material is formed, respectively, on predetermined positions of the sulfidation detection conductor (2), and a second protective film (7) made of a soluble material is formed so as to cover the sulfidation detection conductor (2) positioned between the pair of first protective films (3), and thereafter, end face electrodes (5) are formed, respectively, on divided faces of each strip-shaped substrate (10B) obtained by primarily dividing the large-sized substrate (10A). Then, after external electrodes (6) are formed by performing electrolytic plating with respect to each chip substrate (10C) obtained by secondarily dividing each strip-shaped substrate (10B), a sulfidation detection portion (2a) is exposed to the outside by removing the second protective film (7), whereby a sulfidation detection sensor (10) can be obtained.

公开(公告)号：US20240011811A1

公开(公告)日：2024-01-11

申请号：US18215961

申请日：2023-06-29

Applicant: KOA CORPORATION

Inventor： Yasuyuki KATASE ,  Miki YAZAWA

IPC: G01F1/692 ,  G01F1/698 ,  G01F15/14

CPC classification number: G01F1/692 ,  G01F1/698 ,  G01F15/14

Abstract: A sensor device according to the present invention includes a substrate including a heat generation portion, a casing including an accommodation portion accommodating the substrate, and a sensor element including a temperature-sensitive resistor and being supported by the substrate, in which the accommodation portion is divided into a plurality of accommodation spaces on a side closer to the sensor element. The accommodation portion is divided into a first accommodation space and a second accommodation space via division plates, and the first accommodation space is formed on a side closer to the sensor element than the second accommodation space, and widely as compared with the second accommodation space.

公开(公告)号：US11821864B2

公开(公告)日：2023-11-21

申请号：US17617122

申请日：2020-05-21

Applicant: KOA CORPORATION

Inventor： Taro Kimura ,  Kentaro Matsumoto

IPC: G01N27/12 ,  G01N17/00

CPC classification number: G01N27/12 ,  G01N17/00

Abstract: A sulfurization detection sensor 10 comprises: a rectangular parallelepiped insulation substrate 1, a pair of front electrodes 2 provided at both ends of a front surface in the longitudinal direction of the insulation substrate 1, respectively, a sulfurization detection conductor 3 connected between the front electrodes 2, a pair of protective films 4 for covering a part of the sulfurization detection conductor 3 and that of the front electrodes 2, respectively, a pair of back electrodes 5 provided at both ends of a back surface in the longitudinal direction of the insulation substrate 1, respectively, a pair of end face electrodes 6 provided at both ends in the longitudinal direction of the insulation substrate 1, respectively, and external electrodes 7 provided on front surfaces of the end face electrodes 6, respectively. Specific regions 3b in which a current hardly flows are formed at both ends in the Y-direction of a sulfurization detection portion 3A.

公开(公告)号：US20230162894A1

公开(公告)日：2023-05-25

申请号：US17919107

申请日：2021-04-05

Applicant: KOA CORPORATION

Inventor： Tamotsu Endo

IPC: H01C1/144 ,  H01C13/00

CPC classification number: H01C1/144 ,  H01C13/00

Abstract: The present invention relates to a shunt resistor for current detection. The shunt resistor (1) includes: a resistance element (5) having a plate shape; and electrodes (6, 7) connected to both end surfaces (5a, 5b) of the resistance element (5), wherein the electrodes (6, 7) have cut portions (11, 12), respectively, the cut portions (11, 12) extending parallel to joint portions (8, 9) of the resistance element (5) and the electrodes (6, 7), and each of the cut portions (11, 12) is located at a position where a relationship Y≤0.80X-1.36 holds, where Y is a distance from each joint portion (6, 7) to each cut portion (11, 12), and X is a length of the joint portions (6, 7) in a width direction of the electrodes (6, 7).

公开(公告)号：US20230152352A1

公开(公告)日：2023-05-18

申请号：US17919944

申请日：2021-04-20

Applicant: KOA CORPORATION

Inventor： Ryou Osawa

IPC: G01R15/14

CPC classification number: G01R15/146

Abstract: A current detection device (30) includes a resistance element (5), and a pair of electrodes (6, 7). The current detection device (30) has a projecting portion (11). The projecting portion (11) has a portion of the resistance element (5) and portions of the pair of electrodes (6, 7). The electrodes (6, 7) have first wall portions (66b, 67b) forming a portion of the projecting portion (11), and second wall portions (66a, 67a) forming the portion of the projecting portion (11). The electrodes (6, 7) have detection areas (66, 67) demarcated by the first wall portion (66b, 67b), the second wall portion (66a, 67a), a leading end portion (66c, 67c), and a contact surface (6a, 7a). The electrodes (6, 7) have voltage detecting portions (20, 21). The voltage detecting portions (20, 21) are arranged in the detection areas (66, 67) with a gap between the leading end portions (66c, 67c).