JP6992292B2 - Memsトランスデューサーの製造方法、memsトランスデューサー、超音波探触子、および超音波診断装置 - Google Patents
Memsトランスデューサーの製造方法、memsトランスデューサー、超音波探触子、および超音波診断装置 Download PDFInfo
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Description
図3は、超音波探触子20の構成について説明するための図である。超音波探触子20は、保護層21と、超音波送受信トランスデューサーとしてのpMUTエレメント22と、バッキング材23と、信号処理回路24とを備えている。なお、pMUTエレメント22の詳細については後述する。
pMUTエレメント22は、半導体微細加工技術(MEMS:Micro Electro Mechanical Systems技術)を用いて製造されている。pMUTエレメント22は、複数の振動子としてのダイアフラム22aが2次元的(あるいは1次元的)に配置された基板101と、ダイアフラム22aの信号を検出する信号検出回路400が設けられた基板401(後述の図5参照)と、が互いに貼り合わされて構成されている。図4は、ダイアフラム22aについて説明するための基板101の平面図である。各ダイアフラム22aは、振動によって超音波の発信、受信を行う。図4において、点線で囲まれた区画(図4の領域E)が1つのセルに対応する。
次に、このような構造を有するpMUTエレメント22の製造方法について説明する。
上記製造方法により複数のダイアフラム22aが形成された基板101は、信号検出回路400が形成された基板401と位置合わせされた後、互いに貼り合わされる。以下では、基板101と基板401との位置合わせ方法について説明する。
図7Aは位置合わせ用ダイアフラムについて説明するための図であり、図7Bはアライメントマーク402について説明するための基板401の平面図である。図7Bにおいて、基板401上に形成されている信号検出回路400については図示を省略している。
上記説明した方法1では、パターンマッチング用のアライメントマーク105が基板101上に設けられていたが、以下説明する方法2では、基板101上にアライメントマーク105を設けない場合について説明する。
ダイアフラム22aの構成要素の1つである振動板102は、上記したようにSi層で構成された薄板構造である。シリコン薄膜は赤外線を透過することが分かっており、光学認識装置がアライメントマーク402の認識に赤外線を用いることにより、位置合わせ用ダイアフラム22aPを破砕せずに位置合わせを行うことができる。図9は、赤外光を用いる場合の位置合わせ方法3について説明するための図である。
方法4は、チップ切り出し時のスクライブラインを活用する方法である。SOI基板である基板101には所定のスクライブラインが設けられているが、方法4では、このスクライブライン上に位置合わせ用ダイアフラム22aPを設ける。
以上説明したように、本発明の実施の形態に係るMEMSトランスデューサーの製造方法は、MEMS技術を用いて、一方の面に圧電材料層103を形成した後、他方の面から開口部101dを形成して複数のダイアフラム22aを基板上に形成した基板101(本発明のMEMS基板に対応)を製造する工程と、複数のダイアフラム22aのうちの少なくとも1つを位置合わせ用ダイアフラム22aPとして用いて、基板101と信号検出回路400が形成された基板401(本発明の電子回路基板に対応)との位置合わせを行う工程と、基板101と基板401とを貼り合わせる工程と、を有する。
以上、図面を参照しながら本発明の実施の形態について説明したが、本発明はかかる例に限定されない。特許請求の範囲の記載範囲内において、当業者が想到できる各種の変更例または修正例についても、本発明の技術的範囲に含まれる。また、開示の趣旨を逸脱しない範囲において、上記実施の形態における各構成要素を任意に組み合わせてもよい。
10 超音波診断装置本体
11 操作入力部
12 送信部
13 受信部
14 画像処理部
15 表示部
16 制御部
20 超音波探触子
21 保護層
22 pMUTエレメント
22a ダイアフラム
22aC チャンネルダイアフラム
22aD ダミーダイアフラム
22aP 位置合わせ用ダイアフラム
23 バッキング材
24 信号処理回路
30 ケーブル
100 圧電素子
101 基板(MEMS基板)
101a Si層
101b SiO2層
101c Si層
101d 開口部
102 振動板
103 圧電材料層
104a,104b 電極
105 アライメントマーク
301 基板
400 信号検出回路
401 基板(電子回路基板)
402 アライメントマーク
OW 観察窓
SL スクライブライン
Claims (9)
- MEMSトランスデューサーの製造方法であって、
MEMS技術を用いて、基板の一方の面に圧電材料層を形成した後、他方の面から開口部を形成して複数のダイアフラムを前記基板上に形成したMEMS基板を製造する工程と、
前記複数のダイアフラムのうちの少なくとも1つを位置合わせ用ダイアフラムとし、当該位置合わせ用ダイアフラムを破壊除去して観察窓を生成する工程と、
前記観察窓と、あらかじめ前記電子回路基板に設けられた位置合わせ用構成物と、に基づいて前記MEMS基板と電子回路基板との位置合わせを行う工程と、
前記MEMS基板と前記電子回路基板とを貼り合わせる工程と、
を有するMEMSトランスデューサーの製造方法。 - 前記MEMSトランスデューサーはpMUT(Piezoelectric Micromachined Ultrasonic Transducer)である、
請求項1に記載のMEMSトランスデューサーの製造方法。 - 前記電子回路基板には、前記ダイアフラムにおける超音波送受信のための送受信信号を検出する信号検出回路が形成される、
請求項1または2に記載のMEMSトランスデューサーの製造方法。 - 前記複数のダイアフラムは、超音波の送受信に用いられるチャンネルを構成する第1のダイアフラムと、超音波の送受信には用いられない第2のダイアフラムと、を含み、
前記位置合わせ用ダイアフラムは、前記第2のダイアフラムのうちの少なくとも1つである、
請求項1から3のいずれか一項に記載のMEMSトランスデューサーの製造方法。 - 前記MEMS基板を製造する工程において、前記MEMS基板を個片化するためのスクライブライン上に前記位置合わせ用ダイアフラムを形成する工程をさらに有し、
前記MEMS基板と前記電子回路基板とを貼り合わせる工程において、前記位置合わせ用ダイアフラムと、あらかじめ前記電子回路基板に設けられた位置合わせ用構成物と、に基づいて前記位置合わせを行う、
請求項1から4のいずれか一項に記載のMEMSトランスデューサーの製造方法。 - MEMS技術を用いて、基板の一方の面に圧電材料層を形成した後他方の面から開口部を形成して複数のダイアフラムを形成し、前記複数のダイアフラムの一部を超音波の送受信に用いられるチャンネルを構成する第1のダイアフラムとし、前記複数のダイアフラムの他の一部を超音波の送受信には用いられない第2のダイアフラムとして、前記第2のダイアフラムの少なくとも1つを破壊除去して観察窓を生成したMEMS基板と、
電子回路基板と、を有し、
前記観察窓を用いて前記MEMS基板と電子回路基板との位置合わせを行い、前記MEMS基板と前記電子回路基板とを貼り合わせた、
MEMSトランスデューサー。 - MEMS技術を用いて、基板の一方の面に圧電材料層を形成した後他方の面から開口部を形成して複数のダイアフラムを形成し、前記複数のダイアフラムの一部を超音波の送受信に用いられるチャンネルを構成する第1のダイアフラムとし、前記複数のダイアフラムの他の一部を超音波の送受信には用いられない第2のダイアフラムとして、前記第2のダイアフラムの少なくとも1つの前記圧電材料層を除去して位置合わせ用ダイアフラムを生成したMEMS基板と、
電子回路基板と、を有し、
前記位置合わせ用ダイアフラムを透過する赤外線を用いて、前記MEMS基板と電子回路基板との位置合わせを行い、前記MEMS基板と前記電子回路基板とを貼り合わせた、
MEMSトランスデューサー。 - 請求項6または7に記載のMEMSトランスデューサーを備えた、
超音波探触子。 - 請求項6または7に記載のMEMSトランスデューサーを備えた超音波探触子から得られた超音波受信信号を用いて超音波診断画像を生成する、
超音波診断装置。
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