JP7084413B2 - 直接相互接続機能をもつ低電圧、低電力memsトランスデューサ - Google Patents
直接相互接続機能をもつ低電圧、低電力memsトランスデューサ Download PDFInfo
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- JP7084413B2 JP7084413B2 JP2019550546A JP2019550546A JP7084413B2 JP 7084413 B2 JP7084413 B2 JP 7084413B2 JP 2019550546 A JP2019550546 A JP 2019550546A JP 2019550546 A JP2019550546 A JP 2019550546A JP 7084413 B2 JP7084413 B2 JP 7084413B2
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Description
本願は、2016年12月4日に出願され、「A Configurable Ultrasonic Line imager」と題する米国仮出願第62,429,832号、2016年12月4日に出願され、「Low Voltage, Low Power MEMS Transducer with Direct Interconnect」と題する米国仮出願第62,429,833号および2016年12月13日に出願され、「Micromachined Transceiver Array」と題する米国仮出願第62,433,782号の利益を主張する。これらの出願の内容はここに参照によりその全体において組み込まれる。
本発明は、イメージング・デバイスに関し、より詳細には、構成可能な超音波ライン・イメージャを有するイメージング・デバイスに関する。
人または動物の体の内部組織、骨、血流または器官を画像化し、該画像を表示するための非侵入的イメージング・システムは、信号を身体に送信し、撮像される身体部分から反射信号を受信することを要する。典型的には、イメージング・システムにおいて使用されるトランスデューサはトランシーバと呼ばれ、トランシーバのいくつかは、光音響効果または超音波効果に基づく。一般に、トランシーバは撮像のために使われるが、必ずしも撮像に限定されない。たとえば、トランシーバは、医療撮像、管内の流れ測定、スピーカーおよびマイクロフォン・アレイ、砕石術、治療のための局在化された組織加熱または手術のための高強度集束超音波(HIFU)において使用できる。
これは、共撮像(co imaging)も許容する。
Claims (20)
- 素子のアレイを有するトランシーバであって、各素子は:
基板と;
前記基板から懸架される膜と;
前記膜上に配置される下部電極と;
前記下部電極上に配置される圧電層と;
前記圧電層上に配置される第一および第二の上部電極との上に形成され、
前記第一の上部電極が前記第二の上部電極から電気的に分離され、前記第一の上部電極は少なくとも第一の周波数に応答し、前記第二の上部電極は少なくとも、前記第一の周波数と異なる第二の周波数に応答し;
前記圧電層は、前記第一の上部電極の下に位置され、第一の向きにポーリングされた第一の部分と、前記第二の上部電極の下に位置され、前記第一の向きと逆の第二の向きにポーリングされた第二の部分とを含み、
各素子が複数の振動モードを示す、
トランシーバ。 - 立ち上がりエッジおよび立ち下がりエッジをもつ信号パルスを生成する回路であって、前記立ち上がりエッジおよび立ち下がりエッジは互いに対称であり、波形の高い部分および低い部分が等しい、回路と;
前記回路および前記下部電極に電気的に結合された導体とをさらに有しており、前記信号パルスが前記導体を通じて前記下部電極に伝送される、
請求項1記載のトランシーバ。 - 各圧電素子の前記電極のうちの一つに接続される前記信号パルスのピークツーピーク振幅が11V AC未満である、請求項2記載のトランシーバ。
- 各圧電素子の電極のうちの他の一つがDCバイアス電圧に接続される、請求項3記載のトランシーバ。
- 前記信号パルスは、二レベルの間で遷移する単極性信号および三レベル信号のうちの少なくとも一つを含み、前記信号パルスは、前記アレイに接続された送信ドライバの出力である、請求項4記載のトランシーバ。
- 前記第一の上部電極を接地またはDCバイアス電圧に結合するよう構成された第一の導体と;
前記第二の上部電極を接地またはDCバイアス電圧に結合するよう構成された第二の導体とをさらに有する、請求項1記載のトランシーバ。 - 第三の上部電極が、前記圧電層上にさらに配置されており、前記第一および第二の上部電極から電気的に分離されている、請求項1記載のトランシーバ。
- 前記圧電層は、前記第三の上部電極の下に第三の部分を含み、前記第三の部分は、前記第一の向きおよび前記第二の向きのうちの一方にポーリングされる、請求項7記載のトランシーバ。
- 前記圧電層は、PZT、KNN、PZT-N、PMT-Pt、AIN、Sc-AIN、ZnO、PVDFおよびLiNiO3のうちの少なくとも一つを含む、請求項1記載のトランシーバ。
- 前記下部電極は、金属でできた信号導体に電気的に接続され、前記金属は、前記基板上に堆積されたTiO2層上に堆積される、請求項1記載のトランシーバ。
- 前記圧電層の厚さが2μm以下である、請求項1記載のトランシーバ。
- 圧電素子が共通の下部電極および二つの上部電極からなり、第一の導体が前記アレイのすべての下部電極を接続しており、圧電素子の列が、第二の導体に接続され受信増幅器に接続される第一の上部電極をもち、同じ列内のすべての圧電素子の第二の上部電極は、第三の導体を使って接続され、前記第三の導体は、列の前記第二の上部電極を、送信モードでは送信ドライバに、受信モードでは受信増幅器に接続するスイッチに接続され、前記アレイは一つまたは複数の列を有する、請求項1記載のトランシーバ。
- 前記下部電極および第一の上部電極からなるサブ圧電素子が、前記下部電極および前記第二の上部電極からなるサブ圧電素子と逆向きにポーリングされる、請求項12記載のトランシーバ。
- 前記少なくとも一つの回路が、圧電素子の前記第二の上部電極に送信信号を送り、同時に、前記圧電素子の前記第一の上部電極から信号を受信するよう構成されている、請求項12記載のトランシーバ。
- 前記デバイスが、連続ドップラー撮像およびBモード撮像の一方を実行するよう構成されている、請求項12記載のトランシーバ。
- 送信モードにおいて、11V ACより低いAC駆動電圧が使用される、請求項1記載のトランシーバ。
- 圧電層の厚さは2μm以下である、請求項1記載のトランシーバ。
- 前記トランシーバは、屈曲動作モードで動作し、前記素子は横モード共振を受け、前記膜の屈曲張力運動(flex tensional motion)により音響信号が送信され、撮像される物体からの受信圧力信号は素子の前記横モード共振によって電荷に変換される、請求項1記載のトランシーバ。
- 送信ドライブ波形は符号化された信号であり、チャープおよびゴレイ符号のうちの一つを含む、請求項4記載のトランシーバ。
- 当該トランシーバは、撮像される器官に向かって超音波信号を送信するために、符号化された信号を使用し、前記受信信号は整合フィルタを用いて処理される、請求項19記載のトランシーバ。
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US15/826,614 US11058396B2 (en) | 2016-12-04 | 2017-11-29 | Low voltage, low power MEMS transducer with direct interconnect capability |
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