[특허]Coil arrangement for search head of a metal detector

Coil arrangement for search head of a metal detector 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01V-003/08
출원번호	US-0039175 (1979-05-15)
발명자 / 주소	Thompson Fredrick H. (Forest Grove OR)
출원인 / 주소	Compass Electronics Corporation (Forest Grove OR 02)
인용정보	피인용 횟수 : 16 인용 특허 : 0

초록 ▼

A unitary balanced-inductor system for use in the search head of an electronic metal detector, having a transmit coil, a smaller, preferably concentric cancel coil of opposite polarity, and a yet smaller receive coil inductively decoupled from the combined transmit and cancel coils. The cancel coil preferably has a smaller number of turns and is located in a slightly higher plane than is the transmit coil, while the receive coil may be placed in a slightly lower plane than the transmit coil, to provide adequate sensitivity to the presence of conductive or magnetic objects separated from the search head without unacceptably high sensitivity to similar objects relatively close to the search head. A closed loop load coil located between portions of the transmit coil and the cancel coil may be used to provide an inductive load on the transmit coil thereby further reducing the sensitivity of the search head to targets in close proximity to the load coil.

대표청구항 ▼

An inductor coil system for a search head of a metal detector having an electrical detection circuit for indicating the proximity of a metal object, said system comprising: (a) planar transmit coil means located in a first plane for producing a first time-varying magnetic field, said transmit coil means including a current path enclosing a first surface through which the magnetic flux of said first magnetic field passes; (b) planar cancel coil means of smaller size than said transmit coil means for producing a second time-varying magnetic field in opposition to said first time-varying magnetic field, said cancel coil means including a current path enclosing a second surface through which the magnetic flux of said second magnetic field passes, said cancel coil means being located in a plane parallel to that of said transmit coil means, a portion of said magnetic flux of said first magnetic field also passing through said second surface; and (c) planar receive coil means of smaller size than said cancel coil means for producing a magnetically-induced electric receive signal, said receive coil means including a current path enclosing a third surface, a portion of said magnetic flux of said first magnetic field also passing through said third surface, and a portion of said magnetic flux of said second magnetic field also passing through said third surface, said first and second magnetic fields inducing opposing voltages in said receive coil means, said receive coil means being electrically connected to said detection circuit.

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Clark Brian (Ridgefield CT) Chew Weng C. (Danbury CT), Apparatus for microinductive investigation of earth formations.
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Kleinberg Robert L. (Ridgefield CT) Dudley Donald G. (Tucson AZ) Chew Weng C. (Ridgefield CT) Clark Brian (Ridgefield CT), Apparatus for microinductive investigation of earth formations.
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Auslnder Klaus (Reutlingen DEX) Fabris Hans-Jrgen (Pfullingen DEX) Patzwald Wolfgang (Reutlingen DEX) Seichter Helmut (Pfullingen DEX), Apparatus for the detection of metal objects located within a poor electrically conductive environment.
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Tuttle John E. B. (Falls Church VA), Buried pipe locator utilizing a change in ground capacitance.
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Crowley Christopher W., Device for selectively detecting metal objects.
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Lesky Edward S. (189 Eden Ave. Satellite Beach FL 32937) Reid Alan J. (808 Kara Cir. Rockledge FL 32955) Bushong Wilton E. (2117 Harrison St. Titusville FL 32780) Dickey Duane P. (1049 Bellefonte Ave, Induction-type metal detector with increased scanning area capability.
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Langdon Roger M. (Colchester GBX) Smith Cyril (Alton GBX), Magnetometer having coil formed by two spiral shaped conductors.
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Reime, Gerd, Metal detector.
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Podhrasky Robert J. (Dallas TX), Metal detector having digital signal processing.
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Westersten, Allan, Metal detector with improved receiver coil.
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Albrecht, Andrej; Zibold, Tobias, Metal sensor.
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Kasahara Riichiro,JPX ; Nozawa Yoshihisa,JPX ; Miyoshi Masanori,JPX ; Kitamura Osamu,JPX, Method and apparatus for determining magnetic powder concentration by using the electromagnetic induction method.
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Reime, Gerd, Sensor for locating metal objects and associated coil.
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Whaley, Brian A., Shieldings for metal detector heads and manufacturing methods thereof.
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Runyan, Fred, Waste collection device.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
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연합인증

Coil arrangement for search head of a metal detector 원문보기

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Coil arrangement for search head of a metal detector 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (16)

관련 콘텐츠

특허 원문 보기

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