JP2022050127A - 超音波プローブ及び超音波検査装置 - Google Patents
超音波プローブ及び超音波検査装置 Download PDFInfo
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- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
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- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
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- B06B1/0681—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface and a damping structure
- B06B1/0685—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element with an electrode on the sensitive surface and a damping structure on the back only of piezoelectric elements
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Abstract
Description
超音波プローブの広範囲の探傷を目的として、その視野角を広げるために30Rの曲面を持つ振動子を用いて曲面振動子型超音波プローブを作製した。比較例1では、曲率30R、幅(曲率方位の長さ)30mm、奥行き2mm、厚み0.4mm、周波数定数2000Hzmの曲面振動子を、その超音波放射方位(視野角)を広角化したい方位に30Rの曲率を持たせて配置する。曲面振動子の上下面には、銀焼き付け電極が形成されている。通常、振動子の背面(超音波放射面とは逆の面)には振動子の残留振動を抑制するバッキング材が接着剤や半田等の接合材で接合される。ここでは、融点が295℃の高温ハンダを用いて、酸化アルミニウム、酸化ジルコニウム、酸化マグネシウムの複合焼結体で構成されたバッキング材を、熱処理温度400℃の真空雰囲気下で接合した。
図3に示すように、圧電体原料を用いて、曲率半径30R、幅(曲率方位の長さ)30mm、奥行き2mm、厚み0.4mm、周波数定数2000Hzmの曲面波振動子を、その超音波放射方位(視野角)を広角化したい方位に30Rの曲率を持たせて配置する。曲面振動子の上下面には、銀粒子とガラス粒子を有機溶剤中に分散させたペーストを、高温焼成で焼き付けて銀焼き付け電極が形成されている。上面のマイナス側の電極はリード線を介して、また下面のプラス側電極はバッキング材の側面にニッケル、金等のメタライズで成膜された側面電極と、これに接続されたリード線を介して、各々診断装置につながれている。振動子の背面(超音波放射面とは逆の面)には、振動子の残留振動を抑制するバッキング材が接着剤や半田等の接合材で接合される。実施例1では、融点295℃の高温半田を用い、酸化アルミニウム、酸化ジルコニウムの複合焼結体で構成されたバッキング材を、熱処理温度400℃の真空雰囲気下で接合した。
図4に示すように、実施例2では実施例1と同様に、曲率30R、幅(曲率方位の長さ)30mm、奥行き2mm、厚み0.4mm、周波数定数2000Hzmの曲面振動子を、その超音波放射方位(視野角)を広角化したい方位に30Rの曲率を持たせて配置する。曲面振動子の上下面には銀焼き付け電極が形成されている。実施例1では、融点315℃の高温ハンダを用い、酸化アルミニウム、酸化マグネシウムの複合焼結体で構成されたバッキング材と熱処理温度400℃の真空雰囲気下で接合した。
図5に示すように、実施例3では実施例1と同様に、曲率30R、幅(曲率方位の長さ)30ミクロン、奥行き2mm、厚み0.4mm、周波数定数2000Hzmの曲面振動子を、その超音波放射方位(視野角)を広角化したい方位に30Rの曲率を持たせて配置する。曲面振動子の上下面には銀焼き付け電極が形成されている。実施例3でも融点295℃の高温ハンダを用いて、酸化アルミニウム、酸化マグネシウム、酸化チタンの複合焼結体で構成されたバッキング材を、熱処理温度400℃の真空雰囲気下で接合した。
Claims (8)
- 超音波を送受信する曲面状の第1面と、前記第1面と反対側に位置する曲面状の第2面とを有する曲面振動子と、
曲面状の第3面を有するバッキング材と、
前記曲面振動子と前記バッキング材とを接合するように、前記曲面振動子の前記第2面と前記バッキング材の前記第3面との間に介在された接合層とを具備し、
前記接合層は、前記曲面振動子の端部における前記第3面の法線方向の第1厚さが前記曲面振動子の中央部における前記第3面の法線方向の第2厚さより厚い形状を有する、超音波プローブ。 - 前記バッキング材の前記第3面の曲率半径が、前記曲面振動子の前記第2面の曲率半径より小さい、請求項1に記載の超音波プローブ。
- 前記バッキング材の前記第3面の前記曲率半径をRb、前記曲面振動子の前記第2面の前記曲率半径をRpとしたとき、前記曲率半径Rbは0.95≦Rp≦0.98を満足する、請求項2に記載の超音波プローブ。
- 前記バッキング材の中央部における前記第3面の接線方向の第1方向に対する幅が、前記曲面振動子の前記第1方向に対する前記第2面の幅より小さい、請求項1ないし請求項3のいずれか1項に記載の超音波プローブ。
- 前記バッキング材の前記第3面の前記幅をWb、前記曲面振動子の前記第2面の幅をWpとしたとき、前記幅Wbは0.90≦Wp≦0.98を満足する、請求項4に記載の超音波プローブ。
- 前記バッキング材は、前記第3面の接線方向の第1方向における端部に面取り加工面を有する、請求項1ないし請求項5のいずれか1項に記載の超音波プローブ。
- 前記バッキング材の面取り加工後の前記第3面の前記幅をWbc、前記曲面振動子の前記第2面の幅をWpとしたとき、前記幅Wbcは0.90≦Wp≦0.98を満足する、請求項6に記載の超音波プローブ。
- 請求項1ないし請求項7のいずれか1項に記載の超音波プローブと、
前記超音波プローブを駆動する駆動部、前記駆動部の動作を制御する制御部、及び前記超音波の反射波信号を処理する信号処理部を備える制御ユニットと
を具備する超音波検査装置。
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JP2009101213A (ja) * | 2003-01-23 | 2009-05-14 | Hitachi Medical Corp | 超音波診断装置 |
JP2010022931A (ja) * | 2008-07-18 | 2010-02-04 | Fujifilm Corp | 接着剤はみ出し防止構造を有する超音波探触子 |
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JP2009101213A (ja) * | 2003-01-23 | 2009-05-14 | Hitachi Medical Corp | 超音波診断装置 |
JP2010022931A (ja) * | 2008-07-18 | 2010-02-04 | Fujifilm Corp | 接着剤はみ出し防止構造を有する超音波探触子 |
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