JP5019020B2 - 誘電体膜の製造方法及び圧電体素子の製造方法並びに液体噴射ヘッドの製造方法 - Google Patents
誘電体膜の製造方法及び圧電体素子の製造方法並びに液体噴射ヘッドの製造方法 Download PDFInfo
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- JP5019020B2 JP5019020B2 JP2006056096A JP2006056096A JP5019020B2 JP 5019020 B2 JP5019020 B2 JP 5019020B2 JP 2006056096 A JP2006056096 A JP 2006056096A JP 2006056096 A JP2006056096 A JP 2006056096A JP 5019020 B2 JP5019020 B2 JP 5019020B2
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- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Formation Of Insulating Films (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
本発明の第1の態様では、乾燥工程及び脱脂工程により、誘電体膜を構成する鉛以外の組成比の分布を小さくし、焼成工程により異物を減少させ、誘電体膜の結晶が良好に成長し、所望の結晶状態の誘電体膜を形成することができる。即ち、Bサイトの成分割合が均一に分布し、組成傾斜の少ない誘電体膜が得られる。
本発明の第2の態様では、Zr/Tiが均一に分布した誘電体膜が得られる。
本発明の第3の態様では、Pbの割合及びZr:Tiの割合を設定して誘電体膜の変位量を長期にわたり確保することができる。
本発明の第4の態様では、Zr:Tiの割合を設定して誘電体膜の変位量を長期にわたり確保することができる。
本発明の第5の態様では、誘電体膜の変位量と耐久性を高次元で両立して誘電体膜の変位量を相当期間の長期にわたり確保することができる。
本発明の第6の態様では、RTA法により誘電体前駆体膜を所望の昇温レートで急速加熱することができる。
本発明の第7の態様では、結晶の配向が制御されることで、機械的特性に非常に優れた誘電体膜を形成することができる。
本発明の第8の態様では、誘電体膜の結晶が良好に成長し、所望の結晶状態の誘電体膜からなる圧電体層を有する圧電体素子とすることができる。
本発明の第9の態様では、所望の結晶状態の誘電体膜からなる圧電体層を有する圧電体素子を備えた液体噴射ヘッドとすることができる。
これにより、Zr/Tiが均一に分布した誘電体膜とされる。
これにより、Zr/Tiが均一に分布した誘電体膜を圧電体層とした圧電体素子とされる。
これにより、Zr/Tiが均一に分布した誘電体膜を圧電体層とした圧電体素子とした液体噴射装置とすることができる。
図1は、本発明の実施形態1に係るインクジェット式記録ヘッドを示す分解斜視図であり、図2は、図1の平面図及び断面図である。図示するように、流路形成基板10は、本実施形態では面方位(110)のシリコン単結晶基板からなり、その一方の面には予め熱酸化により形成した二酸化シリコンからなる、厚さ0.5〜2μmの弾性膜50が形成されている。流路形成基板10には、複数の圧力発生室12がその幅方向に並設されている。また、流路形成基板10の圧力発生室12の長手方向外側の領域には連通部13が形成され、連通部13と各圧力発生室12とが、各圧力発生室12毎に設けられたインク供給路14を介して連通されている。なお、連通部13は、後述する保護基板のリザーバ部と連通して各圧力発生室12の共通のインク室となるリザーバの一部を構成する。インク供給路14は、圧力発生室12よりも狭い幅で形成されており、連通部13から圧力発生室12に流入するインクの流路抵抗を一定に保持している。
まず、図3(a)に示すように、シリコンウェハである流路形成基板用ウェハ110を約1100℃の拡散炉で熱酸化し、その表面に弾性膜50を構成する二酸化シリコン膜51を形成する。なお、本実施形態では、流路形成基板10として、板厚が約625μmと比較的厚く剛性の高いシリコンウェハを用いている。
b.乾燥工程1:140℃、3分
c.乾燥工程2
d.脱脂工程
e.焼成工程(ゾルの結晶化)
Zr/Tiの分布と異物量の脱脂条件依存性を調べた。昇温レートと温度との関係を表す図5に示すようなマトリックスを組んで((1)〜(4))、脱脂の温度と昇温レートによる違いを調べた。到達温度は320℃と400℃、昇温レートは脱脂治具の有無で調整した(第1の乾燥工程、第2の乾燥工程の条件はそれぞれ140℃で3分、170℃で20分、焼成は拡散炉で700℃で30分固定)。
次に、第2の乾燥工程の温度を振った実験結果を示す。組成傾斜をできるだけ小さく抑えるため、脱脂工程の条件は(3)400℃の直置きに固定した。PZT(100)回折ピーク半価幅の第2の乾燥工程の温度依存性は図9のようになった。即ち、第2乾燥工程の温度が220℃の近傍にピークを持つ曲線となった。半価幅は170℃から220℃までの間で増大し、さらに高温側ではなだらかに減少している。350℃から400℃での半価幅は低温側とほぼ変わらない。
RTAによる急速加熱焼成。第2の乾燥工程の条件及び脱脂工程の条件により組成傾斜
を抑制することができる。異物の問題は焼成工程における昇温レートを大幅に上げることで解決される。昇温レートを大幅に上げるために、焼成工程ではRTAによる急速加熱を実施している。
上記の結果より、熱処理条件を以下のように決定し、第1の乾燥工程、第2の乾燥工程及び脱脂工程によりZr/Ti組成傾斜を小さくしてZr/Tiを均一に分布させ、焼成工程により異物を削減することができる。
第2の乾燥工程:160℃5分
脱脂工程:400℃5分ホットプレート直置き相当の昇温レート焼成工程:昇温レート100[℃/sec]〜150[℃/sec](RTAによる急速加熱)5分
以上、本発明の各実施形態を説明したが、本発明は、上述した実施形態に限定されるものではない。また、上述した実施形態では、インクジェット式記録ヘッドを例示して本発明を説明したが、勿論、インク以外の液体を噴射するものにも適用することができる。その他の液体噴射ヘッドとしては、例えば、プリンタ等の画像記録装置に用いられる各種の記録ヘッド、液晶ディスプレー等のカラーフィルタの製造に用いられる色材噴射ヘッド、有機ELディスプレー、FED(面発光ディスプレー)等の電極形成に用いられる電極材料噴射ヘッド、バイオchip製造に用いられる生体有機物噴射ヘッド等が挙げられる。
Claims (9)
- 少なくとも鉛成分を含む誘電体膜を構成する金属を含む有機金属化合物を含有するコロイド溶液を塗布して誘電体前駆体膜を形成する塗布工程と、該誘電体前駆体膜を乾燥する乾燥工程と、前記誘電体前駆体膜を脱脂する脱脂工程と、前記誘電体前駆体膜を焼成して誘電体膜とする焼成工程とを有し、
前記乾燥工程は、前記誘電体前駆体膜を前記コロイド溶液の主溶媒である溶剤の沸点よりも低い温度に加熱して一定時間保持することで乾燥させる第1の乾燥工程と、前記誘電体前駆体膜を140℃〜170℃の範囲で乾燥させる第2の乾燥工程とを有し、
前記脱脂工程は、脱脂の温度が350℃〜450℃とされると共に、昇温レートが15[℃/sec]以上とされ、
前記焼成工程は、昇温レートが100[℃/sec]〜150[℃/sec]とされた
ことを特徴とする誘電体膜の製造方法。 - 請求項1に記載の誘電体膜の製造方法において、少なくとも鉛成分を含む誘電体膜がチタン酸ジルコン酸鉛(PZT)であって、前記乾燥工程及び前記脱脂工程及び焼成工程により、膜厚方向におけるZr/Ti組成の分布を、ESCAにより分析したZr/Ti組成傾斜の値で3%未満としたことを特徴とする誘電体膜の製造方法。
- 請求項1に記載の誘電体膜の製造方法において、
少なくとも鉛成分を含む誘電体膜がチタン酸ジルコン酸鉛(PZT)であって、
コロイド溶液の組成は、Pb:(Zr/Ti)の割合が、(1.10〜1.20):1.00であり、Zr:Tiの組成が、(0.46〜0.51):(0.54〜0.49)である
ことを特徴とする誘電体膜の製造方法。 - 請求項1に記載の誘電体膜の製造方法において、
少なくとも鉛成分を含む誘電体膜がチタン酸ジルコン酸鉛(PZT)であって、
コロイド溶液の組成は、Pb:(Zr/Ti)の割合が、1.18:1.00であり、Zr:Tiの割合が、(0.46〜0.51):(0.54〜0.49)である
ことを特徴とする誘電体膜の製造方法。 - 請求項1に記載の誘電体膜の製造方法において、
少なくとも鉛成分を含む誘電体膜がチタン酸ジルコン酸鉛(PZT)であって、
コロイド溶液の組成は、Pb:Zr:Tiの割合が、1.18:0.51〜0.52:0.48〜0.49である
ことを特徴とする誘電体膜の製造方法。 - 請求項1〜5のいずれかに記載の誘電体膜の製造方法において、前記焼成工程では、RTA法により前記誘電体前駆体膜を加熱することを特徴とする誘電体膜の製造方法。
- 請求項1〜6のいずれかに記載の誘電体膜の製造方法において、結晶を菱面体晶系の(100)面に優先配向させることを特徴とする誘電体膜の製造方法。
- 基板上に下電極膜を形成する工程と、該下電極膜上に圧電体層を形成する工程と、該圧電体層上に上電極膜を形成する工程とを備え、
前記圧電体層を形成する工程が、請求項1〜7のいずれかに記載の製造方法により製造された誘電体膜を製造する方法である
ことを特徴とする圧電体素子の製造方法。 - 請求項8に記載の製造方法により製造された圧電体素子を用いる
ことを特徴とする液体噴射ヘッドの製造方法。
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2006
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- 2006-03-30 KR KR20060028733A patent/KR100859911B1/ko active IP Right Grant
- 2006-03-30 US US11/392,757 patent/US7819508B2/en active Active
- 2006-03-30 EP EP20060006723 patent/EP1708290A3/en not_active Withdrawn
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KR100859911B1 (ko) | 2008-09-23 |
US20090044390A1 (en) | 2009-02-19 |
EP1708290A3 (en) | 2007-01-31 |
KR20060105538A (ko) | 2006-10-11 |
US20060230590A1 (en) | 2006-10-19 |
JP2006306709A (ja) | 2006-11-09 |
US7819508B2 (en) | 2010-10-26 |
US7757362B2 (en) | 2010-07-20 |
EP1708290A2 (en) | 2006-10-04 |
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