JP4392200B2 - Print head and electronics - Google Patents

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Publication number
JP4392200B2
JP4392200B2 JP2003188610A JP2003188610A JP4392200B2 JP 4392200 B2 JP4392200 B2 JP 4392200B2 JP 2003188610 A JP2003188610 A JP 2003188610A JP 2003188610 A JP2003188610 A JP 2003188610A JP 4392200 B2 JP4392200 B2 JP 4392200B2
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JP
Japan
Prior art keywords
print head
flow path
path member
metal plate
piezoelectric actuator
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JP2003188610A
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Japanese (ja)
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JP2005022164A (en
Inventor
慎 石倉
淳 廣田
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Brother Industries Ltd
Kyocera Corp
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Brother Industries Ltd
Kyocera Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、印刷ヘッドおよび電子機器に関し、より詳しくは、圧電アクチュエータの広がり振動、伸び振動、厚み縦振動を利用したインクジェットプリンタ用印刷ヘッドとそれを用いたプリンタ等の電子機器に関する。
【0002】
【従来技術】
従来より、圧電セラミックスを利用して、例えば、圧電アクチュエータ、フィルタ、圧電共振子(発信子を含む)、超音波振動子、超音波モーター、圧電センサ等が製品化されている。
【0003】
これらの中で、圧電アクチュエータは、電気信号に対する応答速度が10−6秒台と非常に高速であるため、インクジェットプリンタの印刷ヘッドとして応用されている。
【0004】
図3は、インクジェット方式を利用した印刷ヘッドを示す断面図である。同図に示すように、このような印刷ヘッドは、複数の変位素子119を有する圧電アクチュエータ101が流路部103上に設けられ構成されている。
【0005】
流路部材103は、インク吐出孔113とインク加圧室115とが一対となり隔壁117を介して複数形成され、これら一対のインク吐出孔113およびインク加圧室115と、圧電アクチュエータ101の最表面に形成された表面電極109とは位置を揃えて構成されている。尚、このような流路部材103は、開口部103aを有する複数の金属板103bを用いて、その開口部103aを厚み方向に揃えるように積層して形成される(例えば、特許文献1)。
【0006】
【特許文献1】
特開平11−34321号公報
【0007】
【発明が解決しようとする課題】
しかしながら、従来の印刷ヘッドの構造では、変位素子119の集積度を高めて一斉に駆動させた場合に、流路部材103が変形し、インク吐出孔113の射出方向がそれて、インク滴の着弾位置がずれるという問題があった。
【0008】
従って、本発明は、圧電素子の集積度を高めて一斉に駆動させた場合にも、流路部材の変形を抑制して、インク吐出孔の射出方向のそれおよびインク滴の着弾位置のずれを防止できる印刷ヘッドおよびそれを用いた電子機器を提供することを目的とする。
【0009】
【課題を解決するための手段】
本発明者は、上記のような課題について鋭意検討した結果、印刷ヘッドを構成する流路部材の少なくとも側面に補強部を設けることにより、圧電素子の集積度を高めて一斉に駆動させた場合にも、粒路部材の変形を抑制して、インク吐出孔の射出方向の逸れおよびインク滴の着弾位置のずれを防止できるという目的を達成できることを見いだした。
【0010】
即ち、本発明の圧電アクチュエータは、開口部を揃えて積層された複数の金属板により構成され、インク吐出孔およびインク加圧室を具備してなる流路部材と圧電アクチュエータとが積層されてなる印刷ヘッドであって、前記金属板は連続した延出部を備え、該延出部を前記流路部材の側面に合せるように折り曲げて前記流路部材の側面における補強部としたことを特徴とする。
【0011】
ここで、記圧電アクチュエータでは、補強部が金属板に連続した延出部により形成され、その延出部を有する金属板が流路部材の最下層に配置されていること、さらに、延出部は、金属板の長辺方向の両縁に沿って折り曲げられていること、流路部材の厚みが1500μm以下、金属板の厚みが300μm以下であることが望ましい。また、このような圧電アクチュエータは、電圧印加により圧電振動する振動素子と電圧印加しても圧電振動しない振動板とを焼結により一体化して構成したものであることが望ましい。そして、本発明にかかる電子機器は上記の印刷ヘッドを備えたことを特徴とする。
【0012】
【発明の実施の形態】
以下、本発明の印刷ヘッドについて詳細に説明する。図1は本発明の印刷ヘッドを示す部分断面斜視図である。
【0013】
本発明に係る印刷ヘッドは、上層側に圧電駆動に供する変位素子19を有する圧電アクチュエータ1と、下層側にインクを吐出するため流路部材3とから構成されている。
【0014】
電アクチュエータ1は、積層された複数の圧電セラミック層5と、これら圧電セラミック層5の間に配置された少なくとも1層の共通電極7と、最上層の前記圧電セラミック層5の表面に複数配列された表面電極9により構成されており、電圧印加により圧電振動する圧電素子1aと電圧印加しても圧電振動しない振動板1bとを焼結により一体化して構成したものであることが望ましい。
【0015】
流路部材3は、開口部3aを揃えて積層された複数の金属板3bにより構成され、インク吐出孔13とインク加圧室15とが一対となり隔壁17を介して複数形成され、これら一対のインク吐出孔13およびインク加圧室15と、圧電アクチュエータ1の最表面に形成された表面電極9とは位置を揃えて形成されている。
【0016】
ここで本発明の印刷ヘッドでは、流路部材3の側面に補強部21を設けたことが重要である。図2は、本発明の具体的な構造を示すものであるが、その補強部21が金属板3bに連続した延出部23により形成され、流路部材3の側面に合せるように折り曲げられており(図2(a))、特に、延出部23を有する金属板が流路部材3の最下層に配置されていることが好ましい(図2(b))。
【0017】
そして、本発明では、流路部材3の厚みが1500μm以下、特に、1000μm以下であること、流路部材3を構成する金属板3bの厚みが300μm以下、特に、50〜200の範囲が好ましい。また、圧電アクチュエータ1の厚みが200μm以下、特に、100μm以下であることが望ましく、このような印刷ヘッドでは、圧電アクチュエータ1に、外部から駆動電圧が供給され、共通電極7と表面電極9との間に電圧を印加して、この表面電極9直下の圧電セラミック層5を変位させることにより、インク加圧室15内のインクを加圧して、流路部材3の底面に開口したインク吐出口13よりインク滴を吐出する。そして、上記のような機構を有する印刷ヘッドはプリンタなどの電子機器に好適に用いることができる。
【0018】
本発明の圧電アクチュエータ1を構成する圧電セラミック層5としては、チタン酸ジルコン酸鉛(PZT系)、マグネシウムニオブ酸鉛(PMN系)、ニッケルニオブ酸鉛(PNN系)、またはこれらの少なくとも1種を主成分とする圧電セラミックスが好適に用いられる。なお、圧電セラミック層5は厚み方向に互いに相対する方向に分極してある。圧電セラミック層5の厚みは、8〜30μm、好ましくは10〜20μmであるのがよい。
【0019】
共通電極7は、Ag、Pd、Pt、Rh、Au、Niの単独もしくは2種以上の組み合わせ、好適にはAg−Pd系合金によって形成されることが望ましく、この圧電セラミック層5と共通電極7とは同時焼成される。共通電極7の厚みは、0.5〜5μm、好ましくは1〜3μmであるのがよい。
【0020】
表面電極9は、Ag、Pd、Pt、Rh、Au系材料、Niの単独もしくは2種以上の組み合わせ、好適にはAu系材料によって形成されることが望ましい。
【0021】
流路部材3を構成する材質は、機械的強度、インクに対する耐食性を高めるという理由から、金属、好ましくは、Fe−Cr系、Fe−Ni系、WC−TiC系の群から選ばれる少なくとも1種の金属、より好ましくは、Fe−Cr系の金属であることがよい。これらの金属板同士、並びに、流路部材3と圧電アクチュエータ1とは、種々の熱硬化性樹脂を含む接着剤により接合されており、特にエポキシ系接着剤が好ましい。
【0022】
次に、圧電アクチュエータ1の製造方法について説明する。まず、前記した圧電セラミックスの粉末を用いて圧電体シートを必要枚数形成した後、この圧電体シートにスクリーン印刷を用いて圧電体シートの略全面に共通電極パターンを形成する。ついで、共通電極パターンが形成された圧電体シートに対して、共通電極パターンを狭持するように、圧電体シートを積層して積層体を形成する。
【0023】
次に、この積層体を所定の形状に切断した後、900〜1100℃程度で焼成して圧電アクチュエータ本体を形成する。
【0024】
最後に、この圧電アクチュエータ本体の表面に導電ペーストを印刷して、所定の駆動部パターンおよびランド部パターンを形成して、600〜800℃程度で焼成する。これにより圧電アクチュエータ1を得ることができる。
【0025】
一方、流路部材3は厚さ30〜100μmの金属板3bを所定枚数積層して形成する。ここで、流路部材3に形成されるインク加圧室15、インク吐出孔13等は各金属板3bをエッチングや金型による打ち抜きを施して形成する。
【0026】
次に、このようにして作製した流路部材3のインク加圧室15と上記圧電アクチュエータ1上に形成した表面電極9との位置を揃えて、圧電アクチュエータ1と流路部材3とを接合する。さらに、この圧電アクチュエータ1の表面電極9上にはドライブ回路からの駆動電圧信号を伝送するための配線基板(図示なし)を設ける。
【0027】
このようにして構成した印刷ヘッドでは、流路部材3に補強部21を設けていることから、印刷ヘッドの主要部である圧電アクチュエータ1や配線基板の配置に支障なく流路部材3の剛性を向上させることが可能となり、これにより変位素子19の集積度を高めて一斉に駆動させた場合にも、路部材3の変形を抑制でき、これによりインク吐出孔13の射出方向のそれおよびインク滴の着弾位置のずれを防止できる。
【0028】
【実施例】
まず、チタン酸ジルコン酸鉛を主成分とするセラミック粉末を用いて厚み25μmの圧電体シートを作製した。次に、得られた圧電体シートを50mm×50mmに裁断して2枚1組に分類した後、2枚1組のうち1枚のグリーンシートの略全面に、Ag−Pdを7:3の割合で含む金属ペーストを印刷し、共通電極パターンを形成した。
【0029】
そして、上記金属ペーストを印刷した面に、他の1枚のグリーンシートを重ね合わせた後、60℃、5Maの条件で熱圧着して圧電体シートの積層体を形成した。次に、この積層体を大気中で脱脂した後、同雰囲気中にて1000℃で2時間焼成した。この後、圧電セラミック層の最表面に、スクリーン印刷法を用いて所定のパターンを有するAuを含有する金属ペーストを印刷し、ピーク温度600℃の連続炉を通過させて厚み約5μmの表面電極を形成した。
【0030】
次に、打ち抜き加工によってインク加圧室を形成した厚み100μmの金属板と、このインク加圧室に連通するインク流路およびインク吐出孔をエッチングや金型プレスを用いた打ち抜き加工によって形成した厚み100μm及び40μmのステンレスからなる金属板を接着剤にて貼り合わせることにより流路部材を形成した。このとき金属板のうちの1枚を、金属板の延出部となるように長辺方向の両縁に沿って折り曲げたものを積層した。ここで、流路部材の厚み方向の略中央の位置に補強部となる延出部を設けたもの(層間の延出部)、流路部材の厚み方向の最下層のインク吐出孔を形成する金属板の位置に補強部となる延出部を設けたもの(最下層の延出部)を作製した。流路部材の厚みは1000μmとした。変位素子は282μmの間隔で90個を2列直列に並べたものを作製した。外形は15mm×30mmとした。また、同材質の角柱状の補強部を流路部材の側面に接着したものを参考例として作製した。
【0031】
次に、上記圧電アクチュエータの表面電極と流路部材のインク加圧室との位置を揃えて接着剤により接着した。しかる後、この表面電極のランド部に配線基板の端子を合せてハンダ付けし、圧電アクチュエータ上に配線基板を接続した。さらに、この配線基板をドライブ回路に接続することにより本発明の印刷ヘッドを得た。本発明の印刷ヘッドの評価は試験印刷時の着弾精度により評価し、着弾精度は設計値からのずれ量を平均で求めた。試験印刷での同時駆動点数は40、80%とした。比較例として、流路部材の側面に補強部を有しない以外は同形態の試料を作製した。
【0032】
【表1】

Figure 0004392200
【0033】
作製した本発明の印刷ヘッドにおいて、流路部材の側面に補強部を設けた試料No.3,4では、いずれも着弾精度が2%以下であった。特に、補強部として、金属板の延出部を最下層に設けた試料No.4では、駆動点数40%での着弾精度が15%、駆動点数80%での着弾精度が17%であった。
【0034】
一方、補強部を設けなかった試料No.1では、着弾精度が25%以上であった。
【0035】
【発明の効果】
以上、詳述したように、本発明によれば、開口部を揃えて積層された複数の金属板により構成され、インク吐出孔およびインク加圧室を具備してなる流路部材と、圧電アクチュエータとが積層されてなるインクジェットヘッドであって、前記金属板は連続した延出部を備え、該延出部を前記流路部材の側面に合せるように折り曲げて前記流路部材の側面における補強部としたことから、圧電素子の集積度を高めて一斉に駆動させた場合にも、路部材の変形を抑制して、インク吐出孔の射出方向のそれおよびインク滴の着弾位置のずれを防止できる。こうして、本発明の印刷ヘッドはプリンタなどの電子機器に好適に用いることができる。
【図面の簡単な説明】
【図1】 図1は本発明の印刷ヘッドを示す部分断面斜視図である。
【図2】 図2(a)は補強部が金属板の延出部により形成され流路部材の側面の金属板の層間に合せるように折り曲げられている形態のもの、(b)は延出部を有する金属板が圧電アクチュエータから最も離れた位置に配置されている形態のものを示す概略断面図である。
【図3】 図3は、従来の流路部材に補強部を設けない印刷ヘッドを示す部分断面斜視図である。
【符号の説明】
1、101・・・・・・・・・圧電アクチュエータ
1a・・・・・・・・・・・・振動素子
1b・・・・・・・・・・・・振動板
3、103・・・・・・・・・流路部材
3a、103a・・・・・・・開口部
3b、103b・・・・・・・金属板
21・・・・・・・・・・・・補強部
23・・・・・・・・・・・・延出部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a print head and an electronic apparatus, and more particularly, spreading vibration of the piezoelectric actuator, elongation vibration, an electronic apparatus such as a printer using the same and ink-jet printer printing heads using thickness longitudinal vibration.
[0002]
[Prior art]
Conventionally, for example, piezoelectric actuators, filters, piezoelectric resonators (including oscillators), ultrasonic vibrators, ultrasonic motors, piezoelectric sensors, and the like have been commercialized using piezoelectric ceramics.
[0003]
Among these, the piezoelectric actuators, since the response speed to electrical signals is very fast and 10 -6 second range, and is applied as a print head of inkjet cartridges.
[0004]
FIG. 3 is a cross-sectional view showing a print head using an inkjet method. As shown in the figure, such printhead, the piezoelectric actuator 101 having a plurality of displacement elements 119 is configured provided on the passage member 10 3.
[0005]
The flow path member 103 includes a pair of ink discharge holes 113 and ink pressurization chambers 115, and a plurality of the flow path members 103 are formed via partition walls 117. The pair of ink discharge holes 113 and ink pressurization chambers 115 and the outermost surface of the piezoelectric actuator 101 are formed. The surface electrode 109 is formed in the same position. Such a flow path member 103 is formed by stacking a plurality of metal plates 103b having openings 103a so that the openings 103a are aligned in the thickness direction (for example, Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-34321
[Problems to be solved by the invention]
However, in the conventional print head structure, when the degree of integration of the displacement elements 119 is increased and driven at the same time, the flow path member 103 is deformed, the ejection direction of the ink ejection holes 113 is deviated, and the ink droplets are landed. There was a problem that the position shifted.
[0008]
Therefore, the present invention suppresses the deformation of the flow path member even when the integration of the piezoelectric elements is increased and driven all at once, so that the deviation of the landing position of the ink droplet and that of the ink ejection hole is suppressed. It is an object of the present invention to provide a print head that can be prevented and an electronic apparatus using the print head.
[0009]
[Means for Solving the Problems]
As a result of earnestly examining the above problems, the present inventor has provided a reinforcing portion on at least the side surface of the flow path member constituting the print head, thereby increasing the degree of integration of piezoelectric elements and driving them all at once. In addition, it has been found that the object of suppressing the deformation of the grain passage member and preventing the deviation of the ejection direction of the ink ejection holes and the deviation of the landing positions of the ink droplets can be achieved.
[0010]
In other words, the piezoelectric actuator of the present invention is composed of a plurality of metal plates stacked with the openings aligned, and is formed by stacking a flow path member having an ink discharge hole and an ink pressurizing chamber, and a piezoelectric actuator. a print head, in that the metal plate comprises an extending portion which is continuous, and a reinforcing portion for definitive the the extending portion on the side surface of the flow path member by bending to fit the sides of the channel member Features.
[0011]
Here, in the previous SL piezoelectric actuator, the reinforcing portion is formed by the extending portion which is continuous to a metal plate, a metal plate having an extended portion of that is positioned in the lowermost layer of the flow path member, further extension It is desirable that the protruding portion is bent along both edges in the long side direction of the metal plate, the thickness of the flow path member is 1500 μm or less, and the thickness of the metal plate is 300 μm or less. In addition, such a piezoelectric actuator is preferably formed by sintering and integrating a vibration element that vibrates piezoelectrically when a voltage is applied and a vibration plate that does not vibrate when applied with a voltage. And the electronic device concerning this invention was equipped with said printing head, It is characterized by the above-mentioned.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the print head of the present invention will be described in detail. FIG. 1 is a partial cross-sectional perspective view showing a print head of the present invention.
[0013]
The print head according to the present invention includes a piezoelectric actuator 1 having a displacement element 19 for piezoelectric driving on the upper layer side, and a flow path member 3 for discharging ink to the lower layer side.
[0014]
Pressure electrostatic actuator 1 includes a plurality of piezoelectric ceramic layers 5 laminated, and the common electrode 7 of at least one layer disposed between the piezoelectric ceramic layer 5, arrayed on the surface of the piezoelectric ceramic layer 5 of the top layer It is desirable that the piezoelectric element 1a that vibrates piezoelectrically when a voltage is applied and the diaphragm 1b that does not vibrate when a voltage is applied are integrated by sintering.
[0015]
The flow path member 3 is composed of a plurality of metal plates 3b stacked with the openings 3a aligned, and a plurality of ink discharge holes 13 and ink pressurizing chambers 15 are formed through a partition wall 17, and the pair of an ink discharge hole 13 and the ink pressure chamber 15 is formed by aligning position to the surface electrode 9 formed on the outermost surface of the piezoelectric actuator 1.
[0016]
Here, in the print head of the present invention, it is important to the provision of the reinforcing portion 21 on the side surface of the flow path member 3. FIG. 2 shows a specific structure of the present invention. The reinforcing portion 21 is formed by an extending portion 23 continuous with the metal plate 3b, and is bent so as to match the side surface of the flow path member 3. cage (FIG. 2 (a)), in particular, it is preferable that a metal plate having an extending portion 23 is disposed in the lowermost layer of the flow path member 3 (Figure 2 (b)).
[0017]
And in this invention, the thickness of the flow path member 3 is 1500 micrometers or less, Especially 1000 micrometers or less, The thickness of the metal plate 3b which comprises the flow path member 3 is 300 micrometers or less, Especially the range of 50-200 is preferable. Further, it is desirable that the thickness of the piezoelectric actuator 1 is 200 μm or less, particularly 100 μm or less. In such a print head, a driving voltage is supplied to the piezoelectric actuator 1 from the outside, and the common electrode 7 and the surface electrode 9 By applying a voltage between them and displacing the piezoelectric ceramic layer 5 immediately below the surface electrode 9, the ink in the ink pressurizing chamber 15 is pressurized, and the ink discharge port 13 opened at the bottom surface of the flow path member 3. More ink droplets are ejected. And the print head which has the above mechanisms can be used suitably for electronic devices, such as a printer.
[0018]
As the piezoelectric ceramic layer 5 constituting the piezoelectric actuator 1 of the present invention, lead zirconate titanate (PZT), lead magnesium niobate (PMN), lead nickel niobate (PNN), or at least one of these Piezoelectric ceramics mainly composed of are preferably used. The piezoelectric ceramic layer 5 is polarized in the direction opposite to each other in the thickness direction. The thickness of the piezoelectric ceramic layer 5 is 8 to 30 μm, preferably 10 to 20 μm.
[0019]
The common electrode 7 is desirably formed of Ag, Pd, Pt, Rh, Au, Ni, or a combination of two or more, preferably an Ag—Pd alloy, and the piezoelectric ceramic layer 5 and the common electrode 7 are preferably formed. And co-firing. The thickness of the common electrode 7 is 0.5 to 5 μm, preferably 1 to 3 μm.
[0020]
The surface electrode 9 is desirably formed of Ag, Pd, Pt, Rh, an Au-based material, Ni alone or a combination of two or more, preferably an Au-based material.
[0021]
The material constituting the flow path member 3 is metal, preferably at least one selected from the group consisting of Fe—Cr, Fe—Ni, and WC—TiC, because it increases mechanical strength and corrosion resistance to ink. More preferably, it is preferable to use a Fe-Cr-based metal. These metal plates, the flow path member 3 and the piezoelectric actuator 1 are joined by adhesives containing various thermosetting resins, and epoxy adhesives are particularly preferable.
[0022]
Next, a method for manufacturing the piezoelectric actuator 1 will be described. First, a required number of piezoelectric sheets are formed using the above-described piezoelectric ceramic powder, and then a common electrode pattern is formed on substantially the entire surface of the piezoelectric sheet using screen printing on the piezoelectric sheet. Next, the piezoelectric sheet is laminated on the piezoelectric sheet on which the common electrode pattern is formed so as to sandwich the common electrode pattern, thereby forming a laminate.
[0023]
Next, this laminated body is cut into a predetermined shape and then fired at about 900 to 1100 ° C. to form a piezoelectric actuator body.
[0024]
Finally, a conductive paste is printed on the surface of the piezoelectric actuator main body to form predetermined drive part patterns and land part patterns, which are fired at about 600 to 800 ° C. Thereby, the piezoelectric actuator 1 can be obtained.
[0025]
On the other hand, the flow path member 3 is formed by laminating a predetermined number of metal plates 3b having a thickness of 30 to 100 μm. Here, the ink pressurization chamber 15 and the ink discharge holes 13 formed in the flow path member 3 are formed by etching each metal plate 3b or punching it with a mold.
[0026]
Next, the piezoelectric actuator 1 and the flow path member 3 are joined by aligning the positions of the ink pressurizing chamber 15 of the flow path member 3 thus prepared and the surface electrode 9 formed on the piezoelectric actuator 1. . Further, a wiring board (not shown) for transmitting a drive voltage signal from the drive circuit is provided on the surface electrode 9 of the piezoelectric actuator 1.
[0027]
In the print head configured as described above, since the reinforcing portion 21 is provided in the flow path member 3, the rigidity of the flow path member 3 can be increased without hindering the arrangement of the piezoelectric actuator 1 and the wiring board which are the main parts of the print head. it is possible to improve, thereby when being driven simultaneously to increase the integration degree of the displacement element 19 also can suppress the deformation of the flow path member 3, thereby it and the ink injection direction of the ink discharge hole 13 It is possible to prevent the landing position of the droplet from shifting.
[0028]
【Example】
First, a piezoelectric sheet having a thickness of 25 μm was prepared using ceramic powder mainly composed of lead zirconate titanate. Next, the obtained piezoelectric sheet was cut into 50 mm × 50 mm and classified into a set of two sheets, and then Ag—Pd of 7: 3 was applied to substantially the entire surface of one green sheet of the two sheets. A metal paste containing a proportion was printed to form a common electrode pattern.
[0029]
Then, the surface printed with the metal paste, after superposing the other one of the green sheets, 60 ° C., to form a laminate of the piezoelectric sheets by thermocompression bonding under the conditions of 5M P a. Next, this laminate was degreased in the air and then fired at 1000 ° C. for 2 hours in the same atmosphere. Thereafter, the outermost surface of the piezoelectric ceramic layer, of predetermined by a screen printing method pattern by printing a metal paste containing A u that having a, the allowed and a thickness of about 5μm to pass continuous furnace peak temperature 600 ° C. A surface electrode 9 was formed.
[0030]
Next, a metal plate having a thickness of 100 μm in which an ink pressurizing chamber is formed by punching, and an ink flow path and ink discharge holes communicating with the ink pressurizing chamber are formed by punching using etching or a die press. A flow path member was formed by bonding metal plates made of 100 μm and 40 μm stainless steel with an adhesive. At this time, one of the metal plates, which was bent along both edges in the long side direction so as to be an extended portion of the metal plate, was laminated. Here, an extension part serving as a reinforcing part is provided at a substantially central position in the thickness direction of the flow path member (interlayer extension part), and a lowermost ink discharge hole in the thickness direction of the flow path member is formed. What provided the extension part used as a reinforcement part in the position of a metal plate (extension part of the lowest layer) was produced. The thickness of the flow path member was 1000 μm. 90 displacement elements were arranged in series in two rows at intervals of 282 μm. The outer shape was 15 mm × 30 mm. Further, a prismatic reinforcing portion made of the same material and bonded to the side surface of the flow path member was produced as a reference example .
[0031]
Next, the surface electrode of the piezoelectric actuator and the ink pressurizing chamber of the flow path member were aligned and adhered with an adhesive. After that, the terminals of the wiring board were aligned with the land portions of the surface electrodes and soldered, and the wiring board was connected on the piezoelectric actuator. Furthermore, the print head of the present invention was obtained by connecting this wiring board to a drive circuit. The print head of the present invention was evaluated by the landing accuracy at the time of test printing, and the landing accuracy was obtained by averaging the deviation from the design value. The number of simultaneous driving points in the test printing was 40 and 80%. As a comparative example, a sample having the same configuration was prepared except that the side surface of the flow path member did not have a reinforcing portion.
[0032]
[Table 1]
Figure 0004392200
[0033]
In the produced print head of the present invention, the sample No. 1 was provided with a reinforcing portion on the side surface of the flow path member. 3, in 4, both landing accuracy is less than or equal to 2 0%. In particular, as a reinforcing part, a sample No. 1 in which an extended part of a metal plate is provided in the lowermost layer. In No. 4, the landing accuracy at 40% drive points was 15%, and the landing accuracy at 80% drive points was 17%.
[0034]
On the other hand, sample no. In No. 1, the landing accuracy was 25% or more.
[0035]
【The invention's effect】
As described above in detail , according to the present invention , the flow path member including the ink discharge holes and the ink pressurizing chamber, which is constituted by a plurality of metal plates stacked with the openings aligned, and the piezoelectric actuator And the metal plate has a continuous extension portion, and the extension portion is bent so as to be aligned with the side surface of the flow path member to reinforce the reinforcement portion on the side surface of the flow path member. since a was, even when the driven simultaneously to increase the integration degree of the piezoelectric element, and suppress deformation of the flow path member, preventing the deviation of the landing position of it and the ink droplet injection direction of the ink discharge hole it can. Thus, the print head of the present invention can be suitably used for electronic devices such as printers.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view showing a print head of the present invention.
FIG. 2 (a) shows a configuration in which a reinforcing portion is formed by an extending portion of a metal plate and is bent so as to fit between the metal plate layers on the side surface of the flow path member, and FIG. It is a schematic sectional drawing which shows the thing of the form by which the metal plate which has a part is arrange | positioned in the position most distant from the piezoelectric actuator.
FIG. 3 is a partial cross-sectional perspective view showing a print head in which a conventional flow path member is not provided with a reinforcing portion.
[Explanation of symbols]
1, 101... Piezoelectric actuator 1a... Vibration element 1b. ················································································· Metal plate 21・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Extension part

Claims (7)

開口部を揃えて積層された複数の金属板により構成され、インク吐出孔およびインク加圧室を具備してなる流路部材と、圧電アクチュエータとが積層されてなる印刷ヘッドであって、前記金属板は連続した延出部を備え、該延出部を前記流路部材の側面に合せるように折り曲げて前記流路部材の側面における補強部としたことを特徴とする印刷ヘッド。A print head comprising a plurality of metal plates laminated with openings aligned, and a flow path member comprising an ink discharge hole and an ink pressurizing chamber, and a piezoelectric actuator, wherein the metal plate is provided with an extending portion which is continuous, the print head is characterized in that the the extending portion and the reinforcing portion definitive on the side surface of the channel member and the channel member by bending to fit the sides of. 前記延出部を有する金属板が前記流路部材の最下層に配置されていることを特徴とする請求項記載の印刷ヘッド。Printing head according to claim 1, wherein a metal plate having the extended portion is disposed in the lowermost layer of the flow path member. 前記延出部は、金属板の長辺方向の両縁に沿って折り曲げられていることを特徴とする請求項1または2に記載の印刷ヘッド。The print head according to claim 1, wherein the extending portion is bent along both edges in the long side direction of the metal plate. 前記流路部材の厚みが1500μm以下、前記金属板の厚みが300μm以下であることを特徴とする請求項1乃至3のうちいずれか記載の印刷ヘッド。 When the thickness of the flow path member is 1500μm or less, the print head according to any one of claims 1 to 3 the thickness of the metal plate and wherein the at 300μm or less. 前記圧電アクチュエータの厚みが200μm以下であることを特徴とする請求項1乃至4のうちいずれか記載の印刷ヘッド。The print head according to claim 1, wherein the piezoelectric actuator has a thickness of 200 μm or less. 前記圧電アクチュエータが、電圧印加により圧電振動する振動素子と電圧印加しても圧電振動しない振動板とを焼結により一体化して構成したものであることを特徴とする請求項1乃至5のうちいずれか記載の印刷ヘッド。 6. The piezoelectric actuator according to any one of claims 1 to 5, wherein a vibration element that vibrates piezoelectrically when a voltage is applied and a vibration plate that does not vibrate when applied with a voltage are integrated by sintering. Or the print head described. 請求項1乃至6のうちいずれか記載の印刷ヘッドを備えたことを特徴とする電子機器。An electronic apparatus comprising the print head according to claim 1.
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