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公开(公告)号：US20240200168A1
公开(公告)日：2024-06-20
申请号：US18529604
申请日：2023-12-05
Applicant: KOA CORPORATION
Inventor： Yoshitaka KUMEDA , Tadahiko Yoshioka
Abstract: A copper alloy material having a low volume resistivity, a low TCR and a small thermal electromotive force with respect to copper and a shunt resistor comprising a resistive body formed by the copper alloy material are provided. The copper-manganese-based copper alloy material includes 4.5-5.5 mass % of manganese, 0.1-0.3 mass % of iron, 0.1-0.5 mass % of tin, and a balance being copper. A volume resistivity is 15-25 μΩ·cm. An absolute value of TCR is 150×10−6/K or less. A thermal electromotive force with respect to copper is 1 μV/K or less. A resistance value change is −0.3% to 0% in a heat resistance test of 175° C. for 3000 hours.
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Patent Agency Ranking
公开(公告)号：US10157700B2
公开(公告)日：2018-12-18
申请号：US15304989
申请日：2015-04-09
Applicant: KOA CORPORATION
Inventor： Kosuke Arai , Tadahiko Yoshioka
Abstract: Provided is a method for producing a resistor, including a step of forming a through-hole in a sheet-like conductive material; a step of fitting a resistive element piece into the through-hole and thus forming joint portions where end surfaces of the resistive element piece are joined to respective side surfaces of the conductive material exposed by the through-hole; and stamping a region including the joint portions from the conductive material, thereby forming a resistor including a resistive element and a pair of electrodes.
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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.
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公开(公告)号：US10163553B2
公开(公告)日：2018-12-25
申请号：US15736123
申请日：2016-06-08
Applicant: KOA CORPORATION
Inventor： Kenji Kameko , Kosuke Arai , Tadahiko Yoshioka
Abstract: Provided is a resistor including a first electrode, a second electrode, and a resistive element disposed between the first and second electrodes. Each of the first and second electrodes includes a main electrode portion and a narrow electrode portion with a narrower width than that of the main electrode portion. The resistive element is disposed between the two narrow electrode portions.
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公开(公告)号：US09378873B2
公开(公告)日：2016-06-28
申请号：US14102762
申请日：2013-12-11
Applicant: KOA CORPORATION
Inventor： Tadahiko Yoshioka , Koichi Hirasawa , Yoshinori Aruga
CPC classification number: H01C1/148 , H01C1/144 , H01C13/00 , H01C17/28 , H01C17/281 , Y10T29/49082
Abstract: Provided is a shunt resistor, which controls an influence of skin effect by high frequency current. The shunt resistor has a rod-shaped resistance body (11), and a pair of main electrode (12), of another material from the resistance body, wherein end faces of the resistance body and the main electrode are bonded. The resistance body (11) has a hole (11a) going through in direction where main electrodes are disposed, or a high resistance part (11b) going through at its axis portion that is highly resistive than outer part, and low resistance part (11c) that is formed in outer of the high resistance part. It is preferable that outer circumference of the resistance body is circle-shaped. Since, current doesn't flow fundamentally in the through hole or the high resistance part, fluctuation band in the current pathway can be reduced. Therefore, change of resistance value by skin effect by high-frequency current can be reduced.
Abstract translation: 提供了分流电阻器，其通过高频电流来控制皮肤效应的影响。 分流电阻器具有棒状电阻体（11），以及一对主电极（12），其与来自电阻体的另一种材料接合，其中电阻体和主电极的端面接合。 电阻体（11）具有在配置有主电极的方向上贯穿的孔（11a），或者在其与外部电阻高的轴部分通过的高电阻部（11b），以及低电阻部（11c ）形成在高电阻部分的外部。 优选地，电阻体的外周是圆形的。 由于电流在通孔或高电阻部分中基本不流动，所以可以减小电流通路中的波动带。 因此，可以降低由高频电流引起的皮肤效应的电阻值的变化。
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公开(公告)号：US20140097933A1
公开(公告)日：2014-04-10
申请号：US14102762
申请日：2013-12-11
Applicant: KOA CORPORATION
Inventor： Tadahiko Yoshioka , Koichi Hirasawa , Yoshinori Aruga
CPC classification number: H01C1/148 , H01C1/144 , H01C13/00 , H01C17/28 , H01C17/281 , Y10T29/49082
Abstract: Provided is a shunt resistor, which controls an influence of skin effect by high frequency current. The shunt resistor has a rod-shaped resistance body (11), and a pair of main electrode (12), of another material from the resistance body, wherein end faces of the resistance body and the main electrode are bonded. The resistance body (11) has a hole (11a) going through in direction where main electrodes are disposed, or a high resistance part (11b) going through at its axis portion that is highly resistive than outer part, and low resistance part (11c) that is formed in outer of the high resistance part. It is preferable that outer circumference of the resistance body is circle-shaped. Since, current doesn't flow fundamentally in the through hole or the high resistance part, fluctuation band in the current pathway can be reduced. Therefore, change of resistance value by skin effect by high-frequency current can be reduced.
Abstract translation: 提供了分流电阻器，其通过高频电流来控制皮肤效应的影响。 分流电阻器具有棒状电阻体（11），以及一对主电极（12），其与来自电阻体的另一种材料接合，其中电阻体和主电极的端面接合。 电阻体（11）具有在配置有主电极的方向上贯穿的孔（11a），或者在其与外部电阻高的轴部分通过的高电阻部（11b），以及低电阻部（11c ）形成在高电阻部分的外部。 优选地，电阻体的外周是圆形的。 由于电流在通孔或高电阻部分中基本不流动，所以可以减小电流通路中的波动带。 因此，可以降低由高频电流引起的皮肤效应的电阻值的变化。
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