JP2014194993A - 圧電素子モジュール、超音波トランスデューサー、超音波デバイス、液体噴射ヘッド、液体噴射装置及び圧電素子モジュールの製造方法 - Google Patents
圧電素子モジュール、超音波トランスデューサー、超音波デバイス、液体噴射ヘッド、液体噴射装置及び圧電素子モジュールの製造方法 Download PDFInfo
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Abstract
【解決手段】第1の圧電体層371を有する第1の圧電素子301と、第1の圧電体層371とは異なる第2の圧電体層372を有する第2の圧電素子302とを同一基板310上に具備し、第1の圧電体層371のd定数が第2の圧電体層372のd定数より大きい。
【選択図】図1
Description
なお、特許文献1、2においては、何れも発信部及び受信部の圧電素子は同一であり、製造方法の困難さからか、発信部と受信部で圧電素子を変えることは行われていない。
かかる態様では、前記第1の圧電体層のd定数が前記第2の圧電体層のd定数より大きい、特性の異なる圧電素子を同一基板上に備え、超音波トランスデューサーでは、発信部、受信部の両方の感度を向上させることができ、また、液体噴射ヘッドでは、駆動波形が同一でも大小の液滴を打ち分けることができる。
かかる態様では、発信部及び受信部の両者の感度が向上した超音波トランスデューサーが実現できる。
かかる態様では、発信部及び受信部の両者の感度が向上した超音波デバイスが実現できる。
かかる態様では、駆動波形が同一でも大小の液滴を打ち分けることができる液体噴射ヘッドが実現される。
かかる態様では、駆動波形が同一でも大小の液滴を打ち分けることができる液体噴射ヘッドが実現される。
かかる態様では、種類の異なる圧電素子を同一基板上に並設して設けることができる。
図1は、本発明の一実施形態に係る超音波トランスデューサーを搭載する超音波デバイスの平面図及びそのA−A′線断面図である。
振動板50上には、発信用超音波トランスデューサー301と受信用超音波トランスデューサー302が配置されている。
さらに、圧電体層371、372の膜厚を薄くすることによって変位特性を向上させ、超音波の発信と受信の効率を向上できる効果が得られる。
図2(a)に示すように、基板310上に酸化シリコンからなる酸化層51及び酸化ジルコニウム層52を設けた後、白金などの導電体層を設けてパターニングして第1電極361を設ける。
次いで、図3(c)に示すように、マスク392により、圧電体層372Aをパターニングし、圧電体層372とする。
このような液体噴射ヘッドの一例を以下に説明するが、異なる圧電素子をどのように配置するかは上述した通りであるので、この点の説明は省略する。
このような圧電素子300Aが形成された流路形成基板10上には、図6に示すように、圧電素子300Aを保護する保護基板30が接着剤35によって接合されている。
以上、本発明の各実施形態について説明したが、本発明の基本的な構成は上述したものに限定されるものではない。
Claims (7)
- 第1の圧電体層を有する第1の圧電素子と、前記第1の圧電体層とは異なる第2の圧電体層を有する第2の圧電素子とを同一基板上に具備し、
前記第1の圧電体層のd定数が前記第2の圧電体層のd定数より大きいことを特徴とする圧電素子モジュール。 - 前記第1の圧電素子と、前記第2の圧電素子とが同一平面上に並設されていることを特徴とする請求項1に記載の圧電素子モジュール。
- 請求項1又は2に記載の圧電素子モジュールを備え、前記第1の圧電体層のg定数が前記第2の圧電体層のg定数より小さく、前記第1の圧電素子を発信部とし、前記第2の圧電素子を受信部とすることを特徴とする超音波トランスデューサー。
- 開口を有する基板と、
前記基板上に設けられた請求項3に記載の超音波トランスデューサーと、
を具備することを特徴とする超音波デバイス。 - 液体を噴射するノズル開口に連通する圧力発生室が設けられた流路形成基板と、
該流路形成基板上に設けられた請求項1又は2に記載の圧電素子モジュールと、を具備することを特徴とする液体噴射ヘッド。 - 請求項5に記載の液体噴射ヘッドを具備することを特徴とする液体噴射装置。
- 第1の圧電体層を有する第1の圧電素子と、前記第1の圧電体層とは異なる第2の圧電体層を有する第2の圧電素子とを同一基板上に具備し、
前記第1の圧電体層のd定数が前記第2の圧電体層のd定数より大きい圧電素子モジュールの製造方法であって、
前記第1の圧電素子及び前記第2の圧電素子の何れか一方の第1電極を個別電極としてパターニングする工程と、
前記第1の圧電素子及び前記第2の圧電素子の何れか一方の圧電体層を塗布すると共にパターニングする工程と、
前記第1の圧電素子及び前記第2の圧電素子の何れか一方の第2電極を共通電極として設ける工程と、
前記第1の圧電素子及び前記第2の圧電素子の他方の第1電極を個別電極としてパターニングする工程と、
前記第1の圧電素子及び前記第2の圧電素子の他方の圧電体層を塗布すると共にパターニングする工程と、
前記第1の圧電素子及び前記第2の圧電素子の他方の第2電極を共通電極として設ける工程と、
を具備することを特徴とする圧電素子モジュールの製造方法。
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