JPH04265875A - 平面型グラジオメータ - Google Patents

平面型グラジオメータ

Info

Publication number
JPH04265875A
JPH04265875A JP3027508A JP2750891A JPH04265875A JP H04265875 A JPH04265875 A JP H04265875A JP 3027508 A JP3027508 A JP 3027508A JP 2750891 A JP2750891 A JP 2750891A JP H04265875 A JPH04265875 A JP H04265875A
Authority
JP
Japan
Prior art keywords
bonding
detection coils
planar gradiometer
sets
bonding wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3027508A
Other languages
English (en)
Inventor
Tokuo Chiba
徳男 千葉
Nobuhiro Shimizu
信宏 清水
Satoru Nakayama
哲 中山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP3027508A priority Critical patent/JPH04265875A/ja
Publication of JPH04265875A publication Critical patent/JPH04265875A/ja
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Magnetic Variables (AREA)
  • Superconductor Devices And Manufacturing Methods Thereof (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】
【0001】
【産業上の利用分野】この発明は高感度磁気センサ、電
流計、変位計、または高周波信号増幅器などに応用する
超伝導量子干渉素子(Superconducting
  Quantum  Interference  
Device:SQUIDと略す)に関するものである
【0002】
【従来の技術】SQUID磁束計は高感度な磁場検出器
として利用されている。例えば1次微分型平面型グラジ
オメータは2個の検出コイルを逆方向に直列に接続して
構成され、地磁気などの一様磁場を消去し、1次磁場勾
配を検出することができる。図2は従来例を示す直交型
平面型グラジオメータの平面図である。2組の平面型グ
ラジオメータをベースライン(検出コイルの中心間距離
)の中心軸で互いに直交させて配置した構造である。 平面型グラジオメータによる磁場測定は、同一点で直交
する2方向の磁場勾配を測定することが必要であり、図
2に示した平面型グラジオメータの構造は同一点で直交
する2方向の磁場勾配を正確に検出することができる。 従来、2組の検出コイルの交差部6はすべて薄膜で形成
されていた。
【0003】
【発明が解決しようとする課題】従来の2組の検出コイ
ルの交差部6を薄膜プロセスによって形成するためには
、半導体などの製造プロセスなどで公知の通り多くの工
程が必要である。少なくとも下部配線堆積、下部配線パ
ターニング、層間絶縁膜堆積、コンタクトホール形成、
上部配線堆積、上部配線パターニングの工程が必要であ
り、工程が複雑で製造時間がかかり、歩留まりが低下す
る問題があった。
【0004】
【課題を解決するための手段】本発明は、上記の課題を
解決するため、同一平面上に構成され、ベースラインの
中心軸で互いに直交する2組の検出コイルを有する直交
型の平面型グラジオメータにおいて、前記2組の検出コ
イルの交差部をボンディングワイヤーにより構成した。
【0005】
【作用】上記のような構造によれば、平面型グラジオメ
ータを製造するための薄膜プロセスはコイルパターンを
形成するための1層の工程のみであり、2組の検出コイ
ルの交差部はワイヤーボンディングという簡単な工程で
形成することができ、製造工程を少なくして簡単に直交
型の平面型グラジオメータを形成することができる。
【0006】
【実施例】以下に本発明の実施例について図面を参照し
て説明する。  図1は本発明の実施例を示す平面型グ
ラジオメータの平面図である。1はボンディングワイヤ
ー、2はボンディングパッド、3は検出コイル部、4は
配線用パッド、5の点線で囲んだ部分はコイル交差部で
ある。ボンディングワイヤー1の材料としては、例えば
鉛インジウム金(Pb−In−Au)合金(Pb80%
、In16%、Au4%)、鉛インジウム(Pb−In
)合金(Pb80%、In20%)などが用いられるが
、ボンディング可能な超伝導線材であれば他の材料でも
良い。検出コイル部3、ボンディングパッド2、配線用
パッド4の材料としては、例えばニオブ(Nb)、窒化
ニオブ(NbN)、鉛(Pb)、Pb−Inなどの超伝
導材料が用いられるが、他の超伝導材料を用いても良い
。また、ボンディングパッド2の表面にはバッファー層
として金(Au)薄膜が付加されることもある。ボンデ
ィングパッド2及びボンディングワイヤー1は超伝導材
料で構成されるので、ボンディングワイヤー1の両端の
コンタクト部は超伝導コンタクトとすることができる。
【0007】上記のような平面型グラジオメータの構造
によれば、検出コイル部3、ボンディングパッド2、配
線用パッド4は薄膜プロセスにおいて同一層の薄膜堆積
、パターニングの工程で同時に形成することができ、コ
イル交差部5はボンディングワイヤー1をボンディング
パッド2にワイヤーボンディングする工程のみで形成す
ることができる。従って、平面型グラジオメータの製造
工程数が少なくなり、製造時間の短縮及び歩留まりの向
上が可能となる。
【0008】
【発明の効果】以上説明したように本発明によれば、直
交型の平面型グラジオメータにおいて2組の検出コイル
の交差部をボンディングワイヤーにより構成することに
よってその製造工程数を簡単にすることができ、製造時
間の短縮及び歩留まりの向上が可能となる。
【図面の簡単な説明】 【図1】本発明の実施例を示す平面型グラジオメータの
平面図である。  【図2】従来例を示す平面型グラジオメータの平面図で
ある。 【符号の説明】 1・・・ボンディングワイヤー 2・・・ボンディングパッド 3・・・検出コイル部 4・・・配線用パッド 5・・・本発明の実施例によるコイル交差部6・・・従
来例によるコイル交差部

Claims (4)

    【特許請求の範囲】
  1. 【請求項1】同一平面上に構成され、ベースライン(検
    出コイルの中心間距離)の中心軸で互いに直交する2組
    の検出コイルを有する平面型グラジオメータにおいて、
    前記2組の検出コイルの交差部をボンディングワイヤー
    により構成したことを特徴とする平面型グラジオメータ
  2. 【請求項2】前記ボンディングワイヤーは超伝導体で構
    成されていることを特徴とする請求項1記載の平面型グ
    ラジオメータ。
  3. 【請求項3】前記ボンディングワイヤーの両端のコンタ
    クト部は超伝導コンタクトで形成されていることを特徴
    とする請求項1記載の平面型グラジオメータ。
  4. 【請求項4】前記2組の検出コイルは超伝導薄膜で形成
    されていることを特徴とする請求項1記載の平面型グラ
    ジオメータ。
JP3027508A 1991-02-21 1991-02-21 平面型グラジオメータ Pending JPH04265875A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3027508A JPH04265875A (ja) 1991-02-21 1991-02-21 平面型グラジオメータ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3027508A JPH04265875A (ja) 1991-02-21 1991-02-21 平面型グラジオメータ

Publications (1)

Publication Number Publication Date
JPH04265875A true JPH04265875A (ja) 1992-09-22

Family

ID=12223078

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3027508A Pending JPH04265875A (ja) 1991-02-21 1991-02-21 平面型グラジオメータ

Country Status (1)

Country Link
JP (1) JPH04265875A (ja)

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