KR102735009B1 - 인쇄 회로 기판 홀들 내에서 전기 전도성 층들을 측정하기 위한 용량성 테스트 니들 - Google Patents
인쇄 회로 기판 홀들 내에서 전기 전도성 층들을 측정하기 위한 용량성 테스트 니들 Download PDFInfo
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Abstract
상기 테스트 니들은 케이블을 통하여 용량성 측정 장치에 연결되는 용량성 측정 본체를 가진다. 상기 케이블은 실드되어, 상기 용량성 측정 본체 만이 다른 전기 전도성 본체와 용량성 결합을 형성할 수 있다. 이에 의하여 상기 용량성 결합은 높은 국부 분해능으로 검출될 수 있다.
Description
도 1은 플라잉 프로브 테스터의 사시도이다,
도 2a 내지 2c는 본 발명에 따른 테스트 니들을 갖는 테스트 프로브의 사시도들 및 측면도를 도시한다,
도 3은 테스팅 팁을 갖는 테스트 니들의 세부사항을 도시하는 단면도이다,
도 4는 인쇄 회로 기판은 단면으로 도시되고 접지 전도체 트랙은 전기 접지에 접속된, 인쇄 회로 기판의 도금된 관통-홀 내에서 전기 전도성 층을 측정하기 위한 측정 장치를 개략적으로 도시하며,
도 5는 인쇄 회로 기판은 단면으로 도시되고 접지 전도체 트랙은 전기 접지에 접속되지 않은, 인쇄 회로 기판의 도금된 관통-홀 내에서 전기 전도성 층을 측정하기 위한 측정 장치를 개략적으로 도시하며,
도 6은 도 4 및 도 5에 따른 도금된 관통-홀 내에서의 전도성 층의 비접촉 측정을 위한 측정 장치들의 등가 회로도를 도시한다.
2 테스트 핑거 22 접속 단부
3 테스트 프로브 23 측정 단부
4 인쇄 회로 기판 24 튜브
5 횡방향 유닛 25 케이블
6 가이드 레일 26 용량성 측정 본체
7 지지체 27 측정 팁
8 관통 개구 28 캐뉼라 튜브
9 슬라이더 29 납땜된 접속부
10 테스트 니들 30 출구 개구
11 접촉 팁 31 도금된 관통-홀
12 테스트 브로브 32 층
13 베이스 플레이트 33 전도체 트랙
14 멈춤쇠 본체 34 전기 접지
15 멈춤쇠 암 35 신호 발생기
16 스프링 암 (베이스 스프링 암) 36 전류-측정 장치
17 스프링 암 (자유 스프링 암) 37 홀
18 자유 단부 38 인쇄 회로 기판
19 테스트 니들 39 연산 증폭기
20 측정 태그 40 측정 저항기
Claims (19)
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- 노출된 인쇄 회로 기판들의 홀들 내에서 전기 전도성 층들을 측정하는 방법으로서,
상기 인쇄 회로 기판의 사전결정된 접촉 지점 부근으로 이동될 수 있게 사전결정된 테스팅 영역에서 자유롭게 이동할 수 있는 적어도 하나의 테스트 핑거를 가지는 플라잉 프로브 테스터가 사용되고,
상기 테스트 핑거는, 실드로 둘러싸인 전기 전도체를 포함하는 테스트 니들로서, 용량성 측정 장치에 전기적으로 접속될 수 있는 접속 단부 및 측정 동안 홀 내로 삽입될 수 있는 측정 단부를 가지며, 상기 측정 단부에서, 상기 전기 전도체에 접속되는 용량성 측정 본체는 상기 실드의 외부에 위치되고 상기 홀 내에서 전기 전도성 층과 용량성 결합을 형성할 수 있는, 테스트 니들을 가지며,
외부의 신호 발생기에 의해 발생된 주파수 신호는 상기 인쇄 회로 기판의 적어도 하나의 전도체 트랙 또는 도금된 관통-홀에 인가되고 적어도 하나의 추가 전도체 트랙은 전기 접지에 접속되고, 상기 용량성 측정 본체를 갖는 테스트 니들이 홀 내에 삽입되며, 상기 용량성 측정 본체의 위치가 검출되는 동시에, 상기 용량성 측정 본체의 주변에 대한 용량성 측정 본체의 전기 정전 용량이 측정되며, 상기 측정된 정전 용량에 기초하여, 전기 전도체가 상기 검출된 위치 근처에 위치하는지에 대한 결정이 이루어지는, 방법. - 제 12 항에 있어서,
상기 플라잉 프로브 테스터는, 인쇄 회로 기판들을 테스트하기 위한 플라잉 프로브 테스터로서,
상기 적어도 하나의 테스트 핑거를 가지며,
상기 테스트 핑거는, 상기 테스트 니들 또는 테스트 프로브를 가지고,
상기 테스트 니들은,
상기 측정 본체는 전기 절연 층으로 둘러싸여 있는 테스트 니들,
상기 측정 본체는 중공 실린더 형태로 구현되는 테스트 니들,
상기 측정 본체는 상기 전기 전도체의 하나 이상의 권선들에 의해 구현되고, 상기 권선들은 상기 실드 외부에 위치되는 테스트 니들 또는
상기 실드를 형성하는 전기 전도성 튜브를 가지고, 상기 전기 전도성 튜브 내에서, 상기 전기 전도체 및 전기 절연 층을 포함하는 케이블이 안내되며, 상기 케이블은 상기 용량성 측정 장치에 접속되도록 상기 접속 단부에서 상기 튜브로부터 짧은 거리로 돌출되고, 상기 튜브 주위에서 하나 이상의 권선들로 상기 측정 본체를 형성하도록 상기 측정 단부에서 짧은 거리로 돌출되고, 측정 팁의 영역에서, 상기 전기 전도성 튜브는 경사지게 절단되어, 상기 케이블이 출구 개구를 통해 배선된 상태로, 경사지게 연장되는 출구 개구가 상기 튜브의 축 방향으로 형성되는 테스트 니들 중 하나이고,
상기 테스트 프로브는,
인쇄 회로 기판들의 홀들 내에서 전기 전도성 층을 측정하기 위한 테스트 프로브로서, 상기 테스트 니들, 및 상기 테스트 니들이 또 다른 본체를 터치하는지 여부를 판단할 수 있는 터치 센서를 포함하는, 방법. - 제 12 항에 있어서,
상기 정전 용량을 측정하기 위해, 적어도 1kHz의 주파수를 갖는 전기 신호가, 측정될 홀의 근처에 전기 전도성 섹션을 갖는 전도성 트랙 및 상기 측정 본체 중 적어도 하나에 인가되는, 방법. - 제 12 항에 있어서,
상기 측정 본체 근처에 전기 전도체가 위치하는지 여부에 대한 결정은, 홀의 정전 용량 프로파일과의 비교에 의해 수행되는, 방법. - 제 12 항에 있어서,
상기 전도체 트랙은 접지 전도체 트랙과 같은 상기 인쇄 회로 기판을 가로질러 연장되는 전도체 트랙인, 방법. - 제 12 항에 있어서,
상기 전기 정전 용량을 측정하기 위해, 전류-측정 장치가 사용되며, 상기 전류-측정 장치의 입력부 측은 인가된 전기 접지의 전위를 갖는, 방법. - 제 12 항에 있어서,
도금된 관통-홀 영역 내에서 다수의 전도성 층들에 측정 신호가 인가되고, 이러한 신호는 상기 측정 본체에 의해 검출될 수 있는, 방법. - 제 18 항에 있어서,
복수의 측정 신호들은 상이한 주파수들을 갖는 발진 신호들이며,
측정에서, 상이한 측정 신호들은 상기 상이한 주파수들에 기초하여 구별되는, 방법.
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