公开(公告)号：US20230144364A1

公开(公告)日：2023-05-11

申请号：US17911824

申请日：2021-02-26

Applicant: KOA CORPORATION

Inventor： Yasushi AKAHANE ,  Nobuhiko TAMADA

IPC: H01L23/498

CPC classification number: H01L23/49883 ,  H01L23/49822

Abstract: A chip resistor comprises an insulating substrate (component body) on which a resistor is formed, a connection terminal (front electrodes, end face electrodes, and back electrodes) formed at both end portions of the insulating substrate, an under layer formed by electrolytic plating to cover the connection terminal, a barrier layer formed by electrolytic plating to cover the under layer, and an external connection layer which is mainly composed of tin and formed on a surface of the barrier layer, wherein the barrier layer is made of alloy plating mainly composed of nickel and containing 3% to 15% of phosphorus, and the under layer is formed of a copper plated layer that is at least either more malleable or more ductile than the barrier layer.

公开(公告)号：US20230140922A1

公开(公告)日：2023-05-11

申请号：US17916641

申请日：2021-04-01

Applicant: KOA CORPORATION

Inventor： Susumu TOYODA ,  Keishi NAKAMURA ,  Shuhei MATSUBARA

IPC: G01R1/20 ,  H01C17/00 ,  H01C1/142

CPC classification number: G01R1/203 ,  H01C17/006 ,  H01C1/142

Abstract: The mounting area for an electronic component and a resistor for current detection is reduced. A current detection resistor for detecting current includes a plate-like resistive body, and a first electrode and an opposite second electrode which are stacked in a thickness direction of the resistive body and are disposed so as to sandwich the resistive body. The first electrode has a groove portion.

公开(公告)号：US11626219B2

公开(公告)日：2023-04-11

申请号：US17584788

申请日：2022-01-26

Applicant: KOA CORPORATION

Inventor： Kazuhisa Ushiyama

IPC: H01C1/14 ,  H01C17/00 ,  H01C7/00

Abstract: 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).

公开(公告)号：US11525720B2

公开(公告)日：2022-12-13

申请号：US16642226

申请日：2018-08-29

Applicant: KOA CORPORATION

Inventor： Yasuyuki Katase

IPC: G01F1/684 ,  G01P5/12

Abstract: An object of the present invention is to provide a sensor unit that can detect a wide range of physical quantity changes with a higher degree of freedom than in the conventional art and is capable of reporting detection information, and a multiple-type sensor using the sensor unit. A flow sensor in the present invention includes a board, a sensor that is arranged on the board and detects a physical quantity change, a plurality of external connection terminals that are electrically connected to the sensor, and a reporting part that reports detection information of the sensor to the outside. In the present invention, a wide range of physical quantity changes can be detected with a higher degree of freedom. Connecting a plurality of sensor units enables use for various applications.

公开(公告)号：US11510286B2

公开(公告)日：2022-11-22

申请号：US16767775

申请日：2018-11-28

Applicant: KOA CORPORATION

Inventor： Toshitsugu Ueda ,  Hiroshi Oigawa ,  Mitsuo Ohashi ,  Mizuho Shimojima ,  Takaaki Yano

IPC: F02D41/14 ,  H05B1/02 ,  G01N33/00 ,  G05D23/19 ,  H03M1/66

Abstract: The present invention provides a heater temperature control circuit including a heater and a control circuit that controls a temperature of the heater, wherein the control circuit includes a bridge circuit in which a first circuit and a second circuit are connected in parallel, and an operational amplifier connected to the bridge circuit, wherein in the first circuit, the heater and a resistor are connected in series, and a midpoint of the first circuit is connected to one input portion of the operational amplifier, and an output value Vout from the second circuit is input to the other input portion of the operational amplifier, the output value Vout being obtained by multiplying a division ratio of a target resistance value Rh of the heater and a resistance value R1 of the resistor with a reference voltage Vref of the bridge circuit.

公开(公告)号：US11268986B2

公开(公告)日：2022-03-08

申请号：US16334494

申请日：2017-08-17

Applicant: KOA CORPORATION

Inventor： Tamotsu Endo

IPC: G01R15/14 ,  G01R19/32

Abstract: Provided is a current measuring device for measuring current, including a conductor (1) adapted to pass current therethrough, and a circuit board (31) with a wire, the wire being adapted to extract a voltage signal from the conductor, in which the circuit board is disposed upright with respect to the conductor.

公开(公告)号：US20220018696A1

公开(公告)日：2022-01-20

申请号：US17275468

申请日：2019-09-19

Applicant: KOA CORPORATION

Inventor： Yasuyuki KATASE

IPC: G01F1/69 ,  G01F1/698

Abstract: It is an object to provide a flow rate sensor device having improved sensor responsiveness compared with the prior art. The present invention is a flow rate sensor device (1) including a sensor element (3, 4) that detects a flow rate, wherein a sensor unit (10) on which the sensor element (3, 4) is mounted and a drive substrate (11) including a drive control circuit are connected through a connection portion (12) narrower than a width of the drive substrate (11). Thus, a heat source in the drive substrate (11) and a heat source in the sensor unit (10) can be separated by the connection portion (12) that is thin in width, and the thermal influence from the drive substrate (11) to the sensor unit (10) can be suppressed. Therefore, good sensor responsiveness can be maintained.

公开(公告)号：US20210388227A1

公开(公告)日：2021-12-16

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: C09D125/18 ,  C09D145/00 ,  C08F234/00 ,  C08F212/34 ,  C08K3/22 ,  C09D7/61 ,  H01B3/30 ,  H01C1/14 ,  H01C7/00

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：US11170918B2

公开(公告)日：2021-11-09

申请号：US17049486

申请日：2019-04-08

Applicant: KOA CORPORATION

Inventor： Kazuhisa Ushiyama ,  Natsuki Iguchi ,  Yasuhiro Kamijo ,  Hisakazu Nagata

IPC: H01C17/00 ,  H01C17/242

Abstract: A chip resistor is capable of improving surge characteristic while finely adjusting a resistance value with high accuracy. A chip resistor includes a resistor which is print-formed such that a first meandering portion is consecutively connected to a second meandering portion across a rectangular adjustment portion. The adjustment portion is provided with a first trimming groove to lengthen a current path of the resistor, thereby improving the surge characteristic while coarsely adjusting a resistance value of the resistor to bring it close to a target resistance value. Furthermore, a second trimming groove is provided in an area of the second meandering portion where a current distribution is small, thereby finely adjusting the resistance value of the resistor to make it coincide with the target resistance value in accordance with a cutting amount of the second trimming groove.

公开(公告)号：US20210249164A1

公开(公告)日：2021-08-12

申请号：US17049486

申请日：2019-04-08

Applicant: KOA CORPORATION

Inventor： Kazuhisa USHIYAMA ,  Natsuki IGUCHI ,  Yasuhiro KAMIJO ,  Hisakazu NAGATA

IPC: H01C17/00 ,  H01C17/242

Abstract: A chip resistor is capable of improving surge characteristic while finely adjusting a resistance value with high accuracy. A chip resistor includes a resistor which is print-formed such that a first meandering portion is consecutively connected to a second meandering portion across a rectangular adjustment portion. The adjustment portion is provided with a first trimming groove to lengthen a current path of the resistor, thereby improving the surge characteristic while coarsely adjusting a resistance value of the resistor to bring it close to a target resistance value. Furthermore, a second trimming groove is provided in an area of the second meandering portion where a current distribution is small, thereby finely adjusting the resistance value of the resistor to make it coincide with the target resistance value in accordance with a cutting amount of the second trimming groove.