KR100905030B1 - Universal grounding plate - Google Patents

Universal grounding plate Download PDF

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Publication number
KR100905030B1
KR100905030B1 KR1020070131392A KR20070131392A KR100905030B1 KR 100905030 B1 KR100905030 B1 KR 100905030B1 KR 1020070131392 A KR1020070131392 A KR 1020070131392A KR 20070131392 A KR20070131392 A KR 20070131392A KR 100905030 B1 KR100905030 B1 KR 100905030B1
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KR
South Korea
Prior art keywords
screw
plate
electronic device
grounding
slit hole
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KR1020070131392A
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Korean (ko)
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KR20090063871A (en
Inventor
민병희
김태윤
임성빈
장재웅
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한국항공우주연구원
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/307—Clamped connections, spring connections utilising a screw or nut clamping member characterised by the thread of the screw or nut

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  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

본 발명은 범용 접지 접속판에 관한 것으로, 본 발명에 따른 범용 접지 접속판은 암나사부가 형성되어 있고 상기 접지테이블에 고정되는 고정판, 슬릿구멍을 구비하는 연결판, 상기 슬릿구멍을 관통하여 상기 고정판의 암나사부에 결합하는 제1 나사, 상기 전자기기와 결합하고, 상기 슬릿구멍을 관통하는 제2 나사, 및 상기 제2 나사와 결합하는 너트부재를 포함하는 것을 특징으로 한다. 본 발명은 하나의 접속판을 사용하여 크기와 형태가 다양한 전자기기들을 쉽고 간편하게 접지테이블에 접속시킬 수 있다.The present invention relates to a general-purpose grounding connection plate, the general-purpose grounding connection plate according to the present invention is a fixing plate is formed with a female threaded portion and fixed to the grounding table, a connecting plate having a slit hole, through the slit hole of the fixing plate And a first screw coupled to the female screw portion, a second screw coupled to the electronic device, penetrating the slit hole, and a nut member coupled to the second screw. The present invention can easily and simply connect a variety of electronic devices of various sizes and shapes to the grounding table by using one connection plate.

전자파 적합성, 접지테이블, 접속판 Electromagnetic Compatibility, Grounding Tables, Junction Plates

Description

범용 접지 접속판 {UNIVERSAL GROUNDING PLATE}Universal Grounding Plate {UNIVERSAL GROUNDING PLATE}

본 발명은 접지 접속판에 관한 것으로, 보다 상세하게는, 하나의 접속판을 이용하여 형태가 다른 여러 전자기기를 손쉽게 접지테이블에 접속시킬 수 있는 범용 접지 접속판에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground connecting plate, and more particularly, to a general-purpose ground connecting plate which can easily connect various electronic devices of different shapes to a ground table using one connecting plate.

위성 및 항공 시스템 등을 구성하고 있는 전자기기들은 시스템 요구 조건에 준하는 전자파 적합성(EMC, electromagnetic compatibility)을 검증받게 된다. 여기서, 전자파 적합성은 주위의 환경 및 기기에 대해 전자기 장애를 일으키지 않고 주위의 전자기 환경 속에서 정상적인 기능을 수행할 수 있는 장치의 능력을 말한다.Electronic devices that make up satellite and aviation systems are verified for electromagnetic compatibility (EMC) in accordance with system requirements. Here, electromagnetic compatibility refers to the ability of a device to perform a normal function in the surrounding electromagnetic environment without causing electromagnetic interference to the surrounding environment and equipment.

이러한 전자파 적합성의 평가는 전자파 무반사실에서 수행될 수 있으며, 전자기기들은 표준규격에서 정의하고 있는 접지테이블 위에 놓여진다. 접지테이블은 도전 평면으로서, 이러한 접지테이블에는 전자기기들이 전기 전도적으로 접속될 수 있다.This evaluation of electromagnetic compatibility can be carried out in an electromagnetic anechoic chamber, where the electronics are placed on a ground table as defined in the standard. The ground table is a conductive plane, to which the electronic devices can be electrically conductively connected.

전자기기들은 다양한 크기와 형태로 이루어져 있으며 접지테이블과의 접속을 위한 본딩(bonding) 부분도 제각기 다른 형상을 띠고 있어, 전자기기를 접지테이블 에 접속시키기 위한 접지판이 별도로 요구된다. 이때, 접지판의 접지 성능은 수 밀리옴(mΩ) 이하의 값으로 유지되는 것이 바람직하다.Electronic devices come in a variety of sizes and shapes, and bonding parts for connecting to the grounding table have different shapes, and a grounding plate for connecting the electronics to the grounding table is required separately. At this time, the ground performance of the ground plate is preferably maintained at a value of several milliohms (mΩ) or less.

종래에는, 크기가 다른 전자기기들에 맞추어 별도의 접지판을 각각 제작하여 사용함으로써 전자기기들을 접지테이블에 접속시킬 수 있었다.In the related art, electronic devices may be connected to a ground table by making and using separate ground plates according to electronic devices having different sizes.

그러나, 이러한 방법은 각각의 전자기기들에 따라 개별적인 접지판을 제작해야 하므로, 전자파 적합성 시험을 준비하는데 너무 많은 시간과 비용이 드는 문제점이 있었다.However, this method has a problem that it takes too much time and cost to prepare the electromagnetic compatibility test, because the individual ground plate must be manufactured for each electronic device.

또한, 접지판의 제작이 용이하지 않을 경우에는, 전도성 테이프를 이용하여 전자기기 상에 한 개의 접지포인트와 전장박스 주변을 접속시킴으로써 전자기기를 접지테이블에 접지시킬 수 있었다.In addition, when the manufacturing of the ground plate is not easy, it was possible to ground the electronic device to the grounding table by connecting one grounding point and the electric box around the electronic device using the conductive tape.

그러나, 이러한 방법은 접지 성능이 크게 떨어지는 문제점이 있었다.However, this method has a problem that the grounding performance is greatly reduced.

본 발명은 전술한 바와 같은 문제점들을 해결하기 위해 창출된 것으로서, 본 발명이 해결하고자 하는 과제는 하나의 접속판을 이용하여 크기와 형태가 각기 다른 전자기기들을 접지테이블에 쉽고 간편하게 접속시킬 수 있고, 동시에 접지 성능을 향상시킬 수 있는 범용 접지 접속판을 제공하는 것이다.The present invention has been made to solve the problems described above, the problem to be solved by the present invention is to easily and simply connect the electronic devices of different sizes and shapes to the grounding table using a single connection plate, At the same time, it provides a universal ground connection plate that can improve grounding performance.

상기한 기술적 과제를 달성하기 위한 본 발명의 한 실시예에 따른 범용 접지 접속판은, 전자기기를 접지테이블에 접속시키는 범용 접지 접속판에 있어서, 암나사부가 형성되어 있고 상기 접지테이블에 고정되는 고정판, 슬릿구멍을 구비하는 연결판, 상기 슬릿구멍을 관통하여 상기 고정판의 암나사부에 결합하는 제1 나사, 상기 전자기기와 결합하고, 상기 슬릿구멍을 관통하는 제2 나사, 및 상기 제2 나사와 결합하는 너트부재를 포함하는 것을 특징으로 한다.According to an aspect of the present invention, a general-purpose ground connection plate according to an embodiment of the present invention includes a fixed plate having a female threaded portion and fixed to the ground table in a universal ground connection plate for connecting an electronic device to a ground table. A connecting plate having a slit hole, a first screw penetrating the slit hole to be coupled to the female screw portion of the fixing plate, a second screw coupled to the electronic device and penetrating the slit hole, and coupled to the second screw. Characterized in that it comprises a nut member.

또한, 상기 너트부재는 상기 고정판에 지지될 수 있다.In addition, the nut member may be supported by the fixing plate.

또한, 상기 제2 나사의 헤드부에는 암나사부가 형성되어 있고, 제3 나사가 상기 전자기기에 형성되어 있는 관통구멍을 관통하여 상기 제2 나사의 암나사부에 결합할 수 있다.In addition, a female screw portion is formed in the head portion of the second screw, and the third screw can be coupled to the female screw portion of the second screw through a through hole formed in the electronic device.

또한, 상기 제1 나사의 헤드부에도 암나사부가 형성되어 있어, 상기 제1 나사와 상기 제2 나사는 서로 교환하여 사용할 수 있다.In addition, a female screw portion is formed in the head portion of the first screw, and the first screw and the second screw can be used interchangeably.

또한, 상기 연결판은 상기 제1 나사를 중심으로 회전할 수 있다.In addition, the connecting plate may rotate about the first screw.

이와 같이, 본 발명에 의하면, 하나의 접속판을 사용하여 크기와 형태가 다양한 전자기기들을 쉽고 간편하게 접지테이블에 접속시킬 수 있다.As described above, according to the present invention, it is possible to easily and simply connect various electronic devices of various sizes and shapes to the grounding table by using one connection plate.

또한, 제1 및 제2 나사, 그리고 너트부재를 사용하여 전자기기를 고정판에 안정되게 결합시키고, 고정판을 접지테이블에 고정함으로써 접지 성능을 향상시킬 수 있다.In addition, by using the first and second screws and nut members to stably couple the electronic device to the fixing plate, and fixing the fixing plate to the ground table it is possible to improve the grounding performance.

또한, 슬릿구멍을 구비한 연결판 구조를 통해 다양한 크기와 형태를 지닌 전자기기에 대해 유연하게 대처할 수 있게 됨으로써 효율적인 전자파 적합성 시험을 수행할 수 있다.In addition, through the connection plate structure having a slit hole, it is possible to flexibly cope with electronic devices of various sizes and shapes, thereby enabling efficient electromagnetic compatibility tests.

이하, 본 발명의 실시예를 첨부된 도면을 참조로 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1에는 본 발명의 실시예에 따른 범용 접지 접속판의 구조가 도시되어 있다. 전자기기(E)는 범용 접지 접속판에 결합되고 범용 접지 접속판은 접지테이블(미도시)에 고정됨으로써, 전자기기(E)가 접지테이블에 접속될 수 있다.1 shows a structure of a universal ground connecting plate according to an embodiment of the present invention. The electronic device E is coupled to the universal ground connection plate and the universal ground connection plate is fixed to a ground table (not shown), whereby the electronic device E can be connected to the ground table.

도 1에 도시되어 있는 바와 같이, 본 발명의 한 실시예에 따른 범용 접지 접속판은 접지테이블에 고정되는 고정판(1)을 포함한다. As shown in FIG. 1, a universal ground connecting plate according to an embodiment of the present invention includes a fixing plate 1 fixed to a ground table.

고정판(1)은 암나사부(15)가 형성된 상단(14)과 전자기기(E)가 놓이는 하단(12) 사이에 단차가 형성된 직사각 형태일 수 있다. 상단(14)은 고정판(1)의 외부 틀을 형성하며, 하단(12)은 고정판(1)의 내부 바닥을 형성한다.The fixing plate 1 may have a rectangular shape in which a step is formed between the upper end 14 on which the female thread part 15 is formed and the lower end 12 on which the electronic device E is placed. The upper end 14 forms the outer frame of the fixing plate 1, and the lower end 12 forms the inner bottom of the fixing plate 1.

암나사부(15)에는 제1 나사(21)가 결합된다. 제1 나사(21)는 연결판(3)의 슬릿구멍(32)(도 2 참조)을 관통하여 암나사부(15)와 결합함으로써 연결판(3)을 고정판(1)에 고정시킬 수 있다.The first screw 21 is coupled to the female screw portion 15. The first screw 21 penetrates the slit hole 32 (see FIG. 2) of the connecting plate 3 and engages with the female screw part 15 to fix the connecting plate 3 to the fixing plate 1.

연결판(3)은, 도 2에 도시되어 있는 바와 같이, 내부에 슬릿구멍(32)이 구비될 수 있고, 슬릿구멍(32)의 길이 방향으로 길게 형성된 직사각 형태일 수 있다. 연결판(3)은 제1 나사(21)를 중심으로 회전 가능하다.As illustrated in FIG. 2, the connecting plate 3 may have a slit hole 32 therein, and may have a rectangular shape formed to be long in the longitudinal direction of the slit hole 32. The connecting plate 3 is rotatable about the first screw 21.

연결판(3)의 슬릿구멍(32)에는 제1나사(21) 이외에도, 제1나사(21)의 반대편에 제2나사(22)가 관통하여 장착된다. 즉, 제2 나사(22)는 연결판(3)과 고정판(1)의 하단(12) 사이에 위치하는 별도의 너트부재(24) 에 형성된 암나사부(245)와 결합하게 된다.In addition to the first screw 21, the second screw 22 penetrates and is mounted in the slit hole 32 of the connecting plate 3 opposite to the first screw 21. That is, the second screw 22 is coupled to the female screw portion 245 formed in a separate nut member 24 positioned between the connecting plate 3 and the lower end 12 of the fixing plate 1.

한편, 너트부재(24)는 고정판(1)의 내부 바닥에 지지되어 전자기기(E)로부터 받는 하중을 흡수하는 기능을 할 수 있다.On the other hand, the nut member 24 is supported by the inner bottom of the fixing plate 1 may function to absorb the load received from the electronic device (E).

제2 나사(22)에는 전자기기(E)가 결합된다. 제2 나사(22)의 헤드부에는 암나사부(225)가 형성되어 있다. 그리고 전자기기(E)에 형성되어 있는 관통구멍(232)을 관통하는 제3 나사(23)가 상기 암나사부(225)와 결합함으로써 전자기기(E)가 제2 나사(22)에 결합될 수 있다.The electronic device E is coupled to the second screw 22. A female screw portion 225 is formed in the head portion of the second screw 22. The third screw 23 penetrating the through hole 232 formed in the electronic device E may be coupled to the female screw part 225 so that the electronic device E may be coupled to the second screw 22. have.

한편, 제1 나사(21)의 헤드부에도 암나사부(215)가 형성되어 있어, 제1 나사(21)와 제2 나사(22)는 서로 교환하여 사용할 수도 있다.On the other hand, the female screw part 215 is also formed in the head part of the 1st screw 21, and the 1st screw 21 and the 2nd screw 22 can also be used interchangeably.

이하에서는, 상기한 바와 같은 범용 접지 접속판을 이용하여 전자기기를 접지테이블에 접속시키는 실시예를 첨부한 도면을 참조하여 상세히 설명한다. Hereinafter, an embodiment of connecting an electronic device to a ground table using the above-described universal ground connecting plate will be described in detail with reference to the accompanying drawings.

도 3은 일반적인 전자기기(E)를 접속테이블(미도시)에 접속시키는 예로서, 도 3에 도시되어 있는 바와 같이, 고정판(1)의 양측부에 암나사부(15)가 각각 세 개씩 형성되어 있고, 각각의 암나사부(15)에는 제1 나사(21)가 결합함으로써 총 여섯 개의 연결판(3)이 고정판(1)의 상단(14)에 고정되어 있다.3 illustrates an example in which a general electronic device E is connected to a connection table (not shown). As illustrated in FIG. 3, three female screw parts 15 are formed at both sides of the fixing plate 1, respectively. The first screw 21 is coupled to each female screw portion 15 so that a total of six connecting plates 3 are fixed to the upper end 14 of the fixing plate 1.

연결판(3)의 길이 방향으로 제1 나사(21)의 반대편에는 제2 나사(22)가 각각 놓여지고, 제2 나사(22)의 암나사부(225)에 제3 나사(23)가 각각 결합함으로써 전자기기(E)가 제2 나사(22)와 결합할 수 있다. 따라서, 전자기기(E)는 본 발명의 실시예에 따른 범용 접지 접속판에 의해 접지테이블(미도시)에 접지될 수 있다.The second screw 22 is placed on the opposite side of the first screw 21 in the longitudinal direction of the connecting plate 3, and the third screw 23 is attached to the female threaded portion 225 of the second screw 22, respectively. By coupling, the electronic device E may be coupled to the second screw 22. Therefore, the electronic device E may be grounded to the ground table (not shown) by the general purpose ground connecting plate according to the embodiment of the present invention.

이때 연결판(3)을 좌우로 이동시켜, 전자기기(E)의 크기에 따라 슬릿구멍(32) 내에서 제1 나사(21)와 제2 나사(22) 사이의 거리를 조절할 수 있다. 예를 들면, 제1나사(21)의 슬릿구멍(32)의 대략 중앙에 위치하고, 제2나사(22)는 슬릿구멍(32)의 끝부분에 위치하도록 연결판(3)를 이동시킬 수 있다. 또한, 필요에 따라 연결판(3), 제1 및 제2 나사(21, 22), 너트부재(24) 등의 개수를 늘려 더 설치할 수도 있다.At this time, by moving the connecting plate 3 to the left and right, it is possible to adjust the distance between the first screw 21 and the second screw 22 in the slit hole 32 according to the size of the electronic device (E). For example, the connecting plate 3 may be moved to be positioned at substantially the center of the slit hole 32 of the first screw 21 and the second screw 22 is located at the end of the slit hole 32. . In addition, if necessary, the number of connecting plates 3, first and second screws 21 and 22, nut members 24 and the like may be increased and installed.

또한, 전자기기(E)의 형태는 원형 혹은 다각형 등일 수도 있고, 이와 같은 경우에는, 제1 나사(21)를 중심으로 연결판(3)을 필요한 각도만큼 회전시켜 제2 나사(22)와 전자기기(E)를 결합시킬 수 있다.In addition, the shape of the electronic device E may be circular, polygonal, or the like. In this case, the second screw 22 and the electron are rotated by rotating the connecting plate 3 by the required angle about the first screw 21. The device E can be combined.

이상에서 본 발명의 실시예를 설명하였으나, 본 발명의 권리범위는 이에 한정되지 아니하며 본 발명의 실시예로부터 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 용이하게 변경되어 균등한 것으로 인정되는 범위의 모든 변경 및 수정을 포함한다. Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and the present invention is easily changed and equivalent to those of ordinary skill in the art to which the present invention pertains. Includes all changes and modifications to the scope of the matter.

도 1은 본 발명의 실시예에 따른 범용 접지 접속판의 구조를 도시한 단면도이다.1 is a cross-sectional view showing the structure of a universal ground connecting plate according to an embodiment of the present invention.

도 2는 본 발명의 실시예에서 연결판의 기능을 도시한 도면이다.2 is a view showing the function of the connecting plate in an embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 범용 접지 접속판의 적용 예를 도시한 사시도이다.3 is a perspective view showing an application example of the universal ground connecting plate according to the embodiment of the present invention.

<도면의 주요 부분에 대한 부호의 설명> <Explanation of symbols for the main parts of the drawings>

1...고정판, 15...암나사부,1 ... fixing plate, 15 ...

21...제1 나사, 22...제2 나사,21 ... 1st screw, 22 ... 2nd screw,

23...제3 나사, 24...너트부재,23 third screw, 24 nut member,

3...연결판, 32...슬릿구멍.3 ... connection plate, 32 ... slit hole.

Claims (5)

전자기기를 접지테이블에 접속시키는 범용 접지 접속판에 있어서,In the general-purpose grounding connection plate which connects an electronic device to a grounding table, 암나사부가 형성되어 있고 상기 접지테이블에 고정되는 고정판;A fixed plate having a female thread portion and fixed to the ground table; 슬릿구멍을 구비하는 연결판;A connecting plate having a slit hole; 상기 슬릿구멍을 관통하여 상기 고정판의 암나사부에 결합하는 제1 나사;A first screw penetrating the slit hole and engaging the female screw portion of the fixing plate; 상기 전자기기와 결합하고, 상기 슬릿구멍을 관통하는 제2 나사; 및A second screw coupled to the electronic device and penetrating the slit hole; And 상기 제2 나사와 결합하는 너트부재;A nut member engaged with the second screw; 를 포함하는 것을 특징으로 하는 범용 접지 접속판.Universal ground connection plate comprising a. 제1항에서,In claim 1, 상기 너트부재는 상기 고정판에 지지되는 것을 특징으로 하는 범용 접지 접속판.And the nut member is supported by the fixing plate. 제1항에서,In claim 1, 상기 제2 나사의 헤드부에는 암나사부가 형성되어 있고, 제3 나사가 상기 전자기기에 형성되어 있는 관통구멍을 관통하여 상기 제2 나사의 암나사부에 결합하는 것을 특징으로 하는 범용 접지 접속판.A female screw portion is formed in the head portion of the second screw, and the third screw is coupled to the female screw portion of the second screw through a through hole formed in the electronic device. 제3항에서,In claim 3, 상기 제1 나사의 헤드부에도 암나사부가 형성되어 있어, 상기 제1 나사와 상기 제2 나사는 서로 교환하여 사용 가능한 것을 특징으로 하는 범용 접지 접속판.A female screw portion is formed in the head portion of the first screw, and the first screw and the second screw can be used interchangeably. 제1항에서,In claim 1, 상기 연결판은 상기 제1 나사를 중심으로 회전 가능한 것을 특징으로 하는 범용 접지 접속판.The connecting plate is a universal ground connection plate, characterized in that rotatable around the first screw.
KR1020070131392A 2007-12-14 2007-12-14 Universal grounding plate KR100905030B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190057625A (en) 2017-11-20 2019-05-29 이윤걸 Grounding apparatus with variable structure

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109976277B (en) * 2019-03-29 2020-11-20 北京宇航***工程研究所 Dynamic reconfigurable universal ground measurement and control equipment based on communication protocol and signal input and output control method thereof

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH06289080A (en) * 1993-04-06 1994-10-18 Nobuyasu Kusano Metal ground plane of open test site for measuring of electromagnetic wave noise
KR970014525A (en) * 1995-08-31 1997-03-29 배순훈 Automatic inspection device for mounting chip parts on printed circuit board
KR0137563Y1 (en) * 1996-12-23 1999-04-01 서두칠 Jig for inspection of tuner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06289080A (en) * 1993-04-06 1994-10-18 Nobuyasu Kusano Metal ground plane of open test site for measuring of electromagnetic wave noise
KR970014525A (en) * 1995-08-31 1997-03-29 배순훈 Automatic inspection device for mounting chip parts on printed circuit board
KR0137563Y1 (en) * 1996-12-23 1999-04-01 서두칠 Jig for inspection of tuner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190057625A (en) 2017-11-20 2019-05-29 이윤걸 Grounding apparatus with variable structure

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