JP5347609B2 - Liquid ejection head and image forming apparatus - Google Patents

Liquid ejection head and image forming apparatus Download PDF

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JP5347609B2
JP5347609B2 JP2009064596A JP2009064596A JP5347609B2 JP 5347609 B2 JP5347609 B2 JP 5347609B2 JP 2009064596 A JP2009064596 A JP 2009064596A JP 2009064596 A JP2009064596 A JP 2009064596A JP 5347609 B2 JP5347609 B2 JP 5347609B2
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寛史 小林
雅紀 島添
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株式会社リコー
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<P>PROBLEM TO BE SOLVED: To solve the problem that solder joint strength decreases or a tact time decreases when laser joining is carried out using a large head even if the width of a common wiring electrode of a flexible substrate is equivalent to the width of an individual wiring electrode. <P>SOLUTION: A non-drive piezoelectric element column 12Ba wider than a drive piezoelectric element column 12A is formed at one end of a piezoelectric element member 12, and a common electrode portion 25 connected with the common electrodes 24 of all the drive piezoelectric element columns 12A is provided on the end face of the non-fr piezoelectric element column 12Ba at the individual electrode side. The individual wiring electrodes 31A of an FPC 15 are joined with an electrical connection member, i.e. solder 32, to the individual electrodes 23 of the drive piezoelectric element columns 12A of the piezoelectric element member 12, and electrically connecting the electrodes. Furthermore, the common wiring electrode 31B of the FPC 15 is similarly joined with the solder 32 to the common electrode portion 25 provided in the non-drive piezoelectric element column 12Ba at one end side of the piezoelectric element member 12, and electrically connecting the electrodes. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は液体吐出ヘッド及び画像形成装置に関する。   The present invention relates to a liquid discharge head and an image forming apparatus.
プリンタ、ファクシミリ、複写装置、プロッタ、これらの複合機等の画像形成装置として、例えばインク液滴を吐出する液体吐出ヘッド(液滴吐出ヘッド)からなる記録ヘッドを用いた液体吐出記録方式の画像形成装置としてインクジェット記録装置などが知られている。この液体吐出記録方式の画像形成装置は、記録ヘッドからインク滴を、搬送される用紙(紙に限定するものではなく、OHPなどを含み、インク滴、その他の液体などが付着可能なものの意味であり、被記録媒体あるいは記録媒体、記録紙、記録用紙などとも称される。)に対して吐出して、画像形成(記録、印字、印写、印刷も同義語で使用する。)を行なうものであり、記録ヘッドが主走査方向に移動しながら液滴を吐出して画像を形成するシリアル型画像形成装置と、記録ヘッドが移動しない状態で液滴を吐出して画像を形成するライン型ヘッドを用いるライン型画像形成装置がある。   As an image forming apparatus such as a printer, a facsimile, a copying machine, a plotter, or a complex machine of these, for example, a liquid discharge recording type image forming using a recording head composed of a liquid discharge head (droplet discharge head) that discharges ink droplets. As an apparatus, an ink jet recording apparatus or the like is known. This liquid discharge recording type image forming apparatus means that ink droplets are transported from a recording head (not limited to paper, including OHP, and can be attached to ink droplets and other liquids). Yes, it is also ejected onto a recording medium or a recording medium, recording paper, recording paper, etc.) to form an image (recording, printing, printing, and printing are also used synonymously). And a serial type image forming apparatus that forms an image by ejecting liquid droplets while the recording head moves in the main scanning direction, and a line type head that forms images by ejecting liquid droplets without moving the recording head There are line type image forming apparatuses using
なお、本願において、液体吐出記録方式の「画像形成装置」は、紙、糸、繊維、布帛、皮革、金属、プラスチック、ガラス、木材、セラミックス等の媒体に液体を吐出して画像形成を行う装置を意味し、また、「画像形成」とは、文字や図形等の意味を持つ画像を媒体に対して付与することだけでなく、パターン等の意味を持たない画像を媒体に付与すること(単に液滴を媒体に着弾させること)をも意味する。また、「インク」とは、インクと称されるものに限らず、記録液、定着処理液、液体などと称されるものなど、画像形成を行うことができるすべての液体の総称として用い、例えば、DNA試料、レジスト、パターン材料なども含まれる。   In the present application, the “image forming apparatus” of the liquid discharge recording method is an apparatus that forms an image by discharging liquid onto a medium such as paper, thread, fiber, fabric, leather, metal, plastic, glass, wood, ceramics, or the like. In addition, “image formation” means not only giving an image having a meaning such as a character or a figure to a medium but also giving an image having no meaning such as a pattern to the medium (simply It also means that a droplet is landed on a medium). “Ink” is not limited to ink, but is used as a general term for all liquids capable of image formation, such as recording liquid, fixing processing liquid, and liquid. DNA samples, resists, pattern materials and the like are also included.
従来、液体吐出ヘッドとして、液室内の液体であるインクを加圧する圧力を発生するための圧力発生手段(アクチュエータ手段)として圧電素子、特に圧電層と内部電極を交互に積層した積層型圧電素子を用いて、積層型圧電素子のd33又はd31方向の変位で液室の壁面を形成する弾性変形可能な振動板を変形させ、液室内容積/圧力を変化させて液滴を吐出させるいわゆる圧電アクチュエータを用いた圧電型ヘッドが知られている。   Conventionally, as a liquid discharge head, a piezoelectric element, particularly a stacked piezoelectric element in which piezoelectric layers and internal electrodes are alternately stacked, is used as pressure generating means (actuator means) for generating pressure to pressurize ink that is liquid in a liquid chamber. Using a so-called piezoelectric actuator that deforms an elastically deformable diaphragm that forms the wall surface of the liquid chamber by displacement in the d33 or d31 direction of the multilayer piezoelectric element, and discharges the liquid droplet by changing the volume / pressure in the liquid chamber The piezoelectric head used is known.
このような圧電型ヘッドでは、例えば積層型圧電素子を用いて、内部電極を端面に引き出した共通電極となる外部電極(端面電極ともいう。)及び個別電極となる外部電極にそれぞれFPC(フレキシブル基板、フレキシブルプリントケーブル、フレキシブル配線基板)などの配線部材の共通配線電極、個別配線電極を接合し、各圧電素子に画像信号に応じた駆動信号を与えるようにしている。   In such a piezoelectric head, for example, using a laminated piezoelectric element, an FPC (flexible substrate) is provided for each of an external electrode (also referred to as an end face electrode) serving as a common electrode with internal electrodes drawn to the end face and an external electrode serving as an individual electrode. Common wiring electrodes and individual wiring electrodes of wiring members such as flexible printed cables and flexible wiring boards) are joined, and a drive signal corresponding to an image signal is given to each piezoelectric element.
この場合、FPCなどの配線部材に設けられた配線用電極と圧電素子の外部電極との電気的な接続を行う方法としては、例えば両電極間に金属を介在させ、両電極をガラス等のレーザー透過剛性部材で密着させて、レーザー光により金属を溶融させることで両電極を金属で溶着して接合する方法、両電極をヒータ等の熱圧着によりこの金属を溶融させることで両電極を金属で溶着して接合する方法が知られている。   In this case, as a method of electrically connecting the wiring electrode provided on the wiring member such as FPC and the external electrode of the piezoelectric element, for example, a metal is interposed between both electrodes, and both electrodes are made of a laser such as glass. A method in which both electrodes are welded and joined together by melting the metal with a laser beam by bonding with a transmission rigid member, and both electrodes are made of metal by melting the metal by thermocompression bonding such as a heater. A method of welding and joining is known.
ところで、圧電型ヘッドの共通電極に流れる電流量は個別電極に流れる電気量よりも格段に大きいため、従来から、両端部又は一端部の複数の圧電素子の共通外部電極に通じる共通電極部を設け、この共通電極部を設ける圧電素子の幅を各ノズルに対応する個別の圧電素子の幅よりも広くし、また、FPC等の配線基板の共通配線電極の幅を個別電極に接続する個別配線電極の幅より広くすることが行われている(特許文献1)。   By the way, since the amount of current flowing through the common electrode of the piezoelectric head is much larger than the amount of electricity flowing through the individual electrode, a common electrode portion that has been connected to the common external electrodes of a plurality of piezoelectric elements at both ends or one end is conventionally provided. The width of the piezoelectric element provided with the common electrode portion is wider than the width of the individual piezoelectric element corresponding to each nozzle, and the width of the common wiring electrode of the wiring board such as FPC is connected to the individual electrode. It is made wider than the width of the above (Patent Document 1).
しかしながら、共通電極部分(共通電極部と共通配線電極との接続部)が広くなると、使用する電気的接続部材(半田など)の量が個別電極部分(個別外部電極と個別配線電極との接続部)よりも多くなり、接続時に大きな熱量を与える必要がある。同様に、配線電極幅や圧電素子幅が共通電極部分は個別電極部分より広いため、共通電極部分の接続時に配線電極等に流れる熱量が多くなり、この点でも大きな熱量を与える必要がある。   However, when the common electrode portion (connection portion between the common electrode portion and the common wiring electrode) becomes wide, the amount of electrical connection members (solder, etc.) to be used becomes the individual electrode portion (connection portion between the individual external electrode and the individual wiring electrode). ) And it is necessary to give a large amount of heat at the time of connection. Similarly, since the common electrode portion is wider than the individual electrode portion in terms of the wiring electrode width and the piezoelectric element width, the amount of heat flowing to the wiring electrode and the like when connecting the common electrode portion increases, and it is necessary to apply a large amount of heat in this respect as well.
そこで、共通電極部を二つに分けて各接続幅を個別電極の幅と同等にすること(特許文献2)、配線基板の共通配線電極を櫛歯状にしたり、共通配線電極長さを短くすること(特許文献3)などが知られている。   Therefore, the common electrode portion is divided into two and each connection width is made equal to the width of the individual electrode (Patent Document 2), the common wiring electrode of the wiring board is comb-shaped, or the common wiring electrode length is shortened. (Patent Document 3) is known.
特開2006−175845号公報JP 2006-175845 A 特開平10−202876号公報Japanese Patent Laid-Open No. 10-202876 特開2002−86739号公報JP 2002-86739 A
ところで、特許文献2、特許文献3のように単一基板に形成された電極部への接合であれば、共通電極形成部、個別電極形成部の熱容量はほとんど差がないため、配線手段の電極幅を同等にすることで接合状態の差を改善することが可能となるが、圧電素子に直接配線手段を接合する場合、個別にカットされた個別電極の接続される圧電素子と、大きな幅の共通電極が形成された圧電素子では熱容量が全く異なり、配線基板の電極幅を同幅に形成したとしても共通電極部の半田の接合強度が十分に確保できないことが明らかになった。   By the way, if it is joining to the electrode part formed in the single board | substrate like patent document 2 and patent document 3, since there is almost no difference in the heat capacity of a common electrode formation part and an individual electrode formation part, it is an electrode of a wiring means. It is possible to improve the difference in the joining state by making the widths equal, but when joining the wiring means directly to the piezoelectric element, the piezoelectric element to which the individually cut individual electrodes are connected and the large width It has been clarified that the piezoelectric elements on which the common electrode is formed have completely different heat capacities, and even if the electrode width of the wiring board is formed to be the same width, sufficient solder joint strength cannot be ensured in the common electrode portion.
この接合強度の低下は、液体吐出ヘッドが大型化することでより大きな問題となる。すなわち、小型のヘッドであれば、ヒータチップで加熱して接合することができ、接合面全面を長めに加熱することで、熱容量の差を補って接合することが可能であるが、ヘッドが長尺化、大型化すると前記ヒータチップでの接合は困難となる。そのため、上述したようにレーザー接合が行われる。これはレーザーをスキャンして電極を1つずつ接合していく方法であり、フレキシブル基板の伸びを抑えることができて、大型のヘッドへのフレキシブル基板の接合が容易になるという利点がある。   This reduction in bonding strength becomes a greater problem as the liquid discharge head becomes larger. In other words, a small head can be joined by heating with a heater chip, and the entire joining surface can be heated longer to compensate for the difference in heat capacity, but the head is longer. When the size and size are increased, joining with the heater chip becomes difficult. Therefore, laser bonding is performed as described above. This is a method in which electrodes are bonded one by one by scanning a laser, and there is an advantage that the flexible substrate can be restrained from being stretched and the flexible substrate can be easily bonded to a large head.
ところが、レーザー接合においては電極当たりの加熱時間が短時間であるため、レーザーによる熱が熱容量の大きな共通電極部の圧電素子に吸収されてしまい、配線手段の電極幅を個別電極と同等としたとしても半田が溶融せずに接合ができない。   However, in laser bonding, since the heating time per electrode is short, the heat from the laser is absorbed by the piezoelectric element of the common electrode portion having a large heat capacity, and the electrode width of the wiring means is made equal to that of the individual electrode. However, the solder does not melt and cannot be joined.
この場合、共通電極部との接合を行うときにだけレーザー照射時間を延ばすことも考えられるが、これでは、タクトタイムの増加やレーザー接合の最大の特徴であるフレキシブル基板の伸びの抑制が図れないなどの不具合が生じる。   In this case, it is conceivable to extend the laser irradiation time only when bonding with the common electrode part, but this cannot increase the tact time and suppress the expansion of the flexible substrate, which is the greatest feature of laser bonding. Such problems occur.
本願発明は上記の課題に鑑みてなされたものであり、圧電素子に配線部材を接合するときのタクトタイムの増加を防止し、特に、長尺ヘッドの圧電素子に配線部材をレーザー接合するときにレーザー接合の利点も犠牲にすることなく短時間で接合できるようにすることを目的とする。   The present invention has been made in view of the above problems, and prevents an increase in tact time when a wiring member is bonded to a piezoelectric element, particularly when a wiring member is laser bonded to a piezoelectric element of a long head. It is an object to enable bonding in a short time without sacrificing the advantages of laser bonding.
上記の課題を解決するため、本発明に係る液体吐出ヘッドは、
液滴を吐出するノズルが連通する複数の加圧液室に対応する複数の圧電素子と、
前記複数の圧電素子に駆動信号を与える配線部材と、を有し、
前記複数の圧電素子の個別電極には電気的接続部材により配線部材に設けられた個別配線電極が接続され
前記複数の圧電素子に共通の共通電極部には電気的接続部材により前記配線部材に設けられた共通配線電極が接続され、
前記共通電極部は前記個別電極よりも面積が広く形成され、
前記配線部材の共通配線電極は、前記共通電極部と接続する接続部に、ノズル配列方向の幅が前記個別配線電極の幅よりも狭い複数の接続部分を有し、
前記配線部材の単位面積当たりの共通配線電極の面積が、前記配線部材の単位面積当たりの個別配線電極の面積よりも少ない
構成とした。
In order to solve the above-described problem, a liquid discharge head according to the present invention includes:
A plurality of piezoelectric elements corresponding to a plurality of pressurized liquid chambers through which nozzles for discharging droplets communicate;
A wiring member for supplying a drive signal to the plurality of piezoelectric elements,
The individual electrodes of the plurality of piezoelectric elements are connected to individual wiring electrodes provided on the wiring member by an electrical connection member. The common electrode portion common to the plurality of piezoelectric elements is provided to the wiring member by an electrical connection member. Connected common wiring electrodes,
The common electrode portion is formed to have a larger area than the individual electrodes,
The common wiring electrode of the wiring member has a plurality of connection portions whose width in the nozzle arrangement direction is narrower than the width of the individual wiring electrode in the connection portion connected to the common electrode portion,
The area of the common wiring electrode per unit area of the wiring member is smaller than the area of the individual wiring electrode per unit area of the wiring member.
ここで、前記配線部材の共通配線電極と前記共通電極部とを接続する電気的接続部材の単位面積当たりの量が、前記配線部材の個別配線電極と前記個別電極とを接続する電気的接続部材の単位面積当たりの量よりも少ない構成とできる。   Here, the amount per unit area of the electrical connection member that connects the common wiring electrode of the wiring member and the common electrode portion is the electrical connection member that connects the individual wiring electrode of the wiring member and the individual electrode. It is possible to make the configuration smaller than the amount per unit area.
また、前記配線部材の共通配線電極は、前記共通電極部と接続する部分で前記複数の接続部分に分岐され、各分岐された接続部分は、前記個別配線電極と同じピッチで配置されている構成とできる。   Further, the common wiring electrode of the wiring member is branched into the plurality of connection portions at a portion connected to the common electrode portion, and each branched connection portion is arranged at the same pitch as the individual wiring electrodes. And can.
また、前記配線部材の共通配線電極の前記複数の接続部分は、前記共通電極部と接続する長さの2倍以上の長さを有している構成とできる。   In addition, the plurality of connection portions of the common wiring electrode of the wiring member may have a length that is twice or more as long as the length connected to the common electrode portion.
また、前記配線部材の共通配線電極と前記共通電極部とを接続する前記電気的接続部材の厚みが、前記配線部材の個別配線電極と前記個別電極とを接続する前記電気的接続部材の厚みよりも薄い構成とできる。   Further, the thickness of the electrical connection member that connects the common wiring electrode of the wiring member and the common electrode portion is greater than the thickness of the electrical connection member that connects the individual wiring electrode of the wiring member and the individual electrode. Can be made thin.
本発明に係る画像形成装置は、本発明に係る液体吐出ヘッドを備えたものである。   An image forming apparatus according to the present invention includes the liquid ejection head according to the present invention.
本発明に係る液体吐出ヘッドによれば、共通電極部は個別電極よりも面積が広く形成され、配線部材の共通配線電極は、共通電極部と接続する接続部に、ノズル配列方向の幅が個別配線電極の幅よりも狭い複数の接続部分を有し、配線部材の単位面積当たりの共通配線電極の面積が、配線部材の単位面積当たりの個別配線電極の面積よりも少ない構成としたので、レーザー接合を行う場合でも、レーザーによる加熱を集中し、同一速度の走査でも接合を可能とすることができ、タクトタイムもレーザー接合のメリットも犠牲にすることなく大型ヘッドへの配線部材の接合を行うことができるようになる。   According to the liquid ejection head according to the present invention, the common electrode portion is formed to have a larger area than the individual electrode, and the common wiring electrode of the wiring member has an individual width in the nozzle arrangement direction at the connection portion connected to the common electrode portion. Since it has a plurality of connection parts narrower than the width of the wiring electrode, the area of the common wiring electrode per unit area of the wiring member is smaller than the area of the individual wiring electrode per unit area of the wiring member. Even when joining, heating by the laser can be concentrated and joining can be performed even at the same speed scanning, and the wiring member is joined to the large head without sacrificing the tact time and the merit of laser joining. Will be able to.
本発明に係る画像形成装置によれば、本発明に係る液体吐出ヘッドを備えるので、安定した画像形成を行うことができる。   According to the image forming apparatus of the present invention, since the liquid discharge head according to the present invention is provided, stable image formation can be performed.
本発明の第1実施形態に係る液体吐出ヘッドの一例を示す分解斜視図である。FIG. 3 is an exploded perspective view illustrating an example of a liquid discharge head according to the first embodiment of the present invention. 同ヘッドの液室長手方向に沿う断面説明図である。It is sectional explanatory drawing along the liquid chamber longitudinal direction of the head. 同ヘッドの液室短手方向に沿うバイピッチ構造の断面説明図である。It is sectional explanatory drawing of the bipitch structure along the liquid chamber transversal direction of the head. 同ヘッドの液室短手方向に沿うノーマルピッチ構造の断面説明図である。It is sectional explanatory drawing of the normal pitch structure along the liquid chamber transversal direction of the head. 圧電素子部材とFPCとの電極接続構造の説明に供するノズル配列方向と直交する方向に沿う模式的説明図である。It is typical explanatory drawing in alignment with the direction orthogonal to the nozzle arrangement direction with which it uses for description of the electrode connection structure of a piezoelectric element member and FPC. 同じく接合状態の要部平面説明図である。It is a principal part plane explanatory view of a joined state similarly. 同じく圧電素子部材とFPCの要部正面説明図である。It is a principal part front explanatory drawing of a piezoelectric element member and FPC similarly. 比較例の電極接続構造の説明に供するノズル配列方向と直交する方向に沿う模式的説明図である。It is typical explanatory drawing in alignment with the direction orthogonal to the nozzle arrangement direction with which it uses for description of the electrode connection structure of a comparative example. 同じく圧電素子部材とFPCの要部正面説明図である。It is a principal part front explanatory drawing of a piezoelectric element member and FPC similarly. 他の例のノズル配列方向と直交する方向に沿う接合状態の要部平面説明図である。It is principal part plane explanatory drawing of the joining state along the direction orthogonal to the nozzle arrangement direction of another example. 同じく圧電素子部材とFPCの要部正面説明図である。It is a principal part front explanatory drawing of a piezoelectric element member and FPC similarly. 本発明に係る画像形成装置の一例を示す全体構成図である。1 is an overall configuration diagram illustrating an example of an image forming apparatus according to the present invention. 同じく要部平面説明図である。Similarly it is principal part plane explanatory drawing.
以下、本発明の実施形態について添付図面を参照して説明する。本発明に係る圧電アクチュエータを含む液体吐出ヘッドの一例について図1ないし図4を参照して説明する。なお、図1は同ヘッドの分解斜視説明図、図2は同ヘッドのノズル配列方向と直交する方向(液室長手方向)に沿う断面説明図、図3及び図4は同ヘッドのノズル配列方向(液室短手方向)に沿う異なる例の断面説明図である。   Embodiments of the present invention will be described below with reference to the accompanying drawings. An example of a liquid discharge head including a piezoelectric actuator according to the present invention will be described with reference to FIGS. 1 is an exploded perspective view of the head, FIG. 2 is a cross-sectional explanatory view along a direction (liquid chamber longitudinal direction) orthogonal to the nozzle arrangement direction of the head, and FIGS. 3 and 4 are nozzle arrangement directions of the head. It is sectional explanatory drawing of the different example along (liquid chamber transversal direction).
この液体吐出ヘッドは、SUS基板で形成した流路基板(液室基板)1と、この流路基板1の下面に接合した振動板部材2と、流路基板1の上面に接合したノズル板3とを有し、これらによって液滴(液体の滴)を吐出する複数のノズル4がそれぞれノズル連通路5を介して連通する個別流路としての複数の液室(加圧液室、圧力室、加圧室、流路などとも称される。)6、液室6にインクを供給する供給路を兼ねた流体抵抗部7、この流体抵抗部7を介して液室6と連通する連通部8を形成し、連通部8に振動板部材2に形成した供給口9を介して後述するフレーム部材17に形成した共通液室10からインクを供給する。   The liquid discharge head includes a flow path substrate (liquid chamber substrate) 1 formed of a SUS substrate, a vibration plate member 2 bonded to the lower surface of the flow path substrate 1, and a nozzle plate 3 bonded to the upper surface of the flow path substrate 1. And a plurality of nozzles 4 for ejecting droplets (liquid droplets) by these, respectively, as a plurality of liquid chambers (pressurized liquid chamber, pressure chamber, Also referred to as a pressure chamber, a flow path, etc.) 6, a fluid resistance portion 7 that also serves as a supply path for supplying ink to the liquid chamber 6, and a communication portion 8 that communicates with the liquid chamber 6 via the fluid resistance portion 7. Ink is supplied from a common liquid chamber 10 formed in a frame member 17 to be described later to the communication portion 8 through a supply port 9 formed in the diaphragm member 2.
流路基板1は、流路板1Aと連通板1Bとを接着して構成している。この流路基板1は、SUS基板を、酸性エッチング液を用いてエッチング、あるいは打ち抜き(プレス)などの機械加工することで、連通路5、加圧液室6、流体抵抗部7などの開口をそれぞれ形成している。   The flow path substrate 1 is configured by bonding a flow path plate 1A and a communication plate 1B. The flow path substrate 1 is formed by etching the SUS substrate using an acidic etchant or machining such as punching (pressing) to open openings such as the communication path 5, the pressurized liquid chamber 6, and the fluid resistance portion 7. Each is formed.
振動板部材2は各液室6に対応してその壁面を形成する各振動領域(ダイアフラム部)2aを有し、振動領域2aの面外側(液室6と反対面側)に島状凸部2bが設けられ、この島状凸部2bに振動領域2aを変形させる駆動手段(アクチュエータ手段、圧力発生手段)としての積層型圧電素子部材12の圧電素子柱12A、12Bの上端面(接合面)を接合している。また、積層型圧電素子部材12の下端面はベース部材13に接合している。   The diaphragm member 2 has each vibration region (diaphragm portion) 2a that forms a wall surface corresponding to each liquid chamber 6, and an island-shaped convex portion on the outer side of the vibration region 2a (on the side opposite to the liquid chamber 6). 2b is provided, and upper end surfaces (joint surfaces) of the piezoelectric element columns 12A and 12B of the laminated piezoelectric element member 12 as driving means (actuator means, pressure generating means) for deforming the vibration region 2a on the island-shaped convex portions 2b. Are joined. The lower end surface of the multilayer piezoelectric element member 12 is joined to the base member 13.
ここで、圧電素子部材12は、圧電材料層21と内部電極22a、22bとを交互に積層したものであり、内部電極22a、22bをそれぞれ端面、即ち圧電素子12の振動板2に略垂直な側面に引き出して、この側面に形成された端面電極(外部電極)23、24に接続し、端面電極(外部電極)23、24間に電圧を印加することで積層方向の変位を生じる。ここで、外部電極23を個別外部電極(個別電極)とし、外部電極24を共通外部電極(共通電極)として使用する。   Here, the piezoelectric element member 12 is formed by alternately laminating piezoelectric material layers 21 and internal electrodes 22 a and 22 b, and the internal electrodes 22 a and 22 b are respectively substantially perpendicular to the end face, that is, the diaphragm 2 of the piezoelectric element 12. By pulling out to the side surface, connecting to the end face electrodes (external electrodes) 23, 24 formed on the side face, and applying a voltage between the end face electrodes (external electrodes) 23, 24, displacement in the stacking direction occurs. Here, the external electrode 23 is used as an individual external electrode (individual electrode), and the external electrode 24 is used as a common external electrode (common electrode).
この圧電素子部材12は、ハーフカットダイシングによる溝加工を施して1つの圧電素子部材に対して所要数の圧電素子柱12A、12Bを所定の間隔で櫛歯状に形成したものである。この例では、各圧電素子柱12A、12Bが「複数の圧電素子」になる。   The piezoelectric element member 12 is formed by forming grooves by half-cut dicing and forming a required number of piezoelectric element columns 12A and 12B in a comb-like shape at a predetermined interval with respect to one piezoelectric element member. In this example, each of the piezoelectric element columns 12A and 12B becomes “a plurality of piezoelectric elements”.
なお、圧電素子部材12の圧電素子柱12A、12Bは、同じものであるが、駆動波形を与えて駆動させる圧電素子柱を駆動圧電素子柱12A、駆動波形を与えないで単なる支柱として使用する圧電素子柱を非駆動圧電素子柱12Bとして区別している。この場合、図3に示すように、駆動圧電素子柱12Aと非駆動圧電素子柱12Bとを交互に使用するバイピッチ構成でも、あるいは、図4に示すようにすべての圧電素子柱を駆動圧電素子柱12Aとして使用するノーマルピッチ構成のいずれでも採用できる。   The piezoelectric element columns 12A and 12B of the piezoelectric element member 12 are the same, but the piezoelectric element column that is driven by giving a drive waveform is used as a drive piezoelectric element column 12A, and a piezoelectric element that is used as a simple support without giving a drive waveform. The element columns are distinguished as non-driving piezoelectric element columns 12B. In this case, as shown in FIG. 3, a bi-pitch configuration in which driving piezoelectric element columns 12A and non-driving piezoelectric element columns 12B are used alternately, or all piezoelectric element columns are driven piezoelectric element columns as shown in FIG. Any of the normal pitch configurations used as 12A can be employed.
また、圧電素子部材12には駆動圧電素子柱12Aに駆動信号を与えるための可撓性を有する配線部材としてのFPC15が接続されている。なお、FPC15は圧電素子部材12の近傍でベース部材13にホットメルト接着剤16で接着されている。   The piezoelectric element member 12 is connected to an FPC 15 as a flexible wiring member for giving a driving signal to the driving piezoelectric element column 12A. The FPC 15 is bonded to the base member 13 with a hot melt adhesive 16 in the vicinity of the piezoelectric element member 12.
ノズル板3は、ニッケル(Ni)の金属プレートから形成したもので、エレクトロフォーミング法(電鋳)で製造している。このノズル板3には各液室6に対応して直径10〜35μmのノズル4を形成し、流路板1に接着剤接合している。そして、このノズル板3の液滴吐出側面(吐出方向の表面:吐出面、又は液室6側と反対の面)には撥水層を設けている。   The nozzle plate 3 is formed from a nickel (Ni) metal plate, and is manufactured by an electroforming method (electroforming). In this nozzle plate 3, nozzles 4 having a diameter of 10 to 35 μm are formed corresponding to the respective liquid chambers 6 and bonded to the flow path plate 1 with an adhesive. A water repellent layer is provided on the droplet discharge side surface (surface in the discharge direction: discharge surface or surface opposite to the liquid chamber 6 side) of the nozzle plate 3.
なお、このヘッドでは、圧電素子部材12の圧電方向としてd33方向の変位を用いて液室6内インクを加圧する構成とし、更に、液滴の吐出方向が液室6での記録液の流れ方向と異なるサイドシュータ方式で液滴を吐出させる構成としている。サイドシュータ方式とすることで、圧電素子部材12の大きさが略ヘッドの大きさとなり、圧電素子部材12の小型化を直接ヘッドの小型化に結びつけることができ、ヘッドの小型化を図り易い。   This head is configured to pressurize the ink in the liquid chamber 6 by using the displacement in the d33 direction as the piezoelectric direction of the piezoelectric element member 12, and the droplet discharge direction is the flow direction of the recording liquid in the liquid chamber 6. The side shooter method is different from that of droplets. By adopting the side shooter system, the size of the piezoelectric element member 12 becomes approximately the size of the head, and the miniaturization of the piezoelectric element member 12 can be directly linked to the miniaturization of the head, and the head can be easily miniaturized.
さらに、これらの圧電素子部材12、ベース部材13及びFPC15などで構成されるアクチュエータ部の外周側には、エポキシ系樹脂或いはポリフェニレンサルファイトで射出成形により形成したフレーム部材17を接合している。そして、このフレーム部材17には前述した共通液室10を形成し、更に共通液室10に外部から記録液を供給するための供給口19を形成し、この供給口19は更に図示しないサブタンクやインクカートリッジなどのインク供給源に接続される。   Further, a frame member 17 formed by injection molding with an epoxy resin or polyphenylene sulfite is joined to the outer peripheral side of the actuator portion composed of the piezoelectric element member 12, the base member 13, the FPC 15, and the like. The frame member 17 is formed with the common liquid chamber 10 described above, and further, a supply port 19 for supplying a recording liquid from the outside to the common liquid chamber 10 is formed. It is connected to an ink supply source such as an ink cartridge.
このように構成した液体吐出ヘッドにおいては、例えば押し打ち方式で駆動する場合には、図示しない制御部から記録する画像に応じて駆動圧電素子柱12Aに20〜50Vの駆動パルス電圧を選択的に印加することによって、パルス電圧が印加された駆動圧電素子柱12Aが変位して振動板2の振動領域2aをノズル板3方向に変形させ、液室6の容積(体積)変化によって液室6内の液体を加圧することで、ノズル板3のノズル4から液滴が吐出される。そして、液滴の吐出に伴って液室6内の圧力が低下し、このときの液流れの慣性によって液室6内には若干の負圧が発生する。この状態の下において、駆動圧電素子柱12Aへの電圧の印加をオフ状態にすることによって、振動板2が元の位置に戻って液室6が元の形状になるため、さらに負圧が発生する。このとき、共通液室10から液室6内に記録液が充填され、次の駆動パルスの印加に応じて液滴がノズル4から吐出される。   In the liquid ejection head configured as described above, for example, when driven by a punching method, a drive pulse voltage of 20 to 50 V is selectively applied to the drive piezoelectric element column 12A according to an image recorded from a control unit (not shown). When applied, the driving piezoelectric element column 12A to which the pulse voltage is applied is displaced to deform the vibration region 2a of the vibration plate 2 in the direction of the nozzle plate 3, and the inside of the liquid chamber 6 is changed by the volume (volume) change of the liquid chamber 6. A liquid droplet is discharged from the nozzle 4 of the nozzle plate 3 by pressurizing the liquid. As the liquid droplets are discharged, the pressure in the liquid chamber 6 decreases, and a slight negative pressure is generated in the liquid chamber 6 due to the inertia of the liquid flow at this time. Under this state, by turning off the application of voltage to the driving piezoelectric element column 12A, the diaphragm 2 returns to the original position and the liquid chamber 6 becomes the original shape, so that further negative pressure is generated. To do. At this time, the recording liquid is filled from the common liquid chamber 10 into the liquid chamber 6, and droplets are ejected from the nozzles 4 in response to the next drive pulse application.
なお、液体吐出ヘッドは、上記の押し打ち以外にも、引き打ち方式(振動板2を引いた状態から開放して復元力で加圧する方式)、引き−押し打ち方式(振動板2を中間位置で保持しておき、この位置から引いた後、押出す方式)などの方式で駆動することもできる。   In addition to the above-described pushing, the liquid ejection head is not limited to the pulling method (a method of releasing the diaphragm 2 from the pulled state and pressurizing it with a restoring force), and the pulling-pushing method (the diaphragm 2 at the intermediate position). It is also possible to drive by pulling from this position and then extruding.
次に、この液体吐出ヘッドにおける圧電素子部材とFPCとの電極接続構造について図5ないし図7を参照して説明する。なお、図5はノズル配列方向と直交する方向に沿う模式的説明図、図6は同じく接合状態の要部平面説明図、図7は圧電素子部材とFPCの要部正面説明図である。ここでは、圧電素子部材12の圧電素子柱はすべて駆動用圧電素子柱12Aとして使用するノーマルピッチ構成で図示している。   Next, an electrode connection structure between the piezoelectric element member and the FPC in this liquid discharge head will be described with reference to FIGS. 5 is a schematic explanatory diagram along a direction orthogonal to the nozzle arrangement direction, FIG. 6 is a principal plan explanatory diagram of the joined state, and FIG. 7 is a principal front explanatory diagram of the piezoelectric element member and the FPC. Here, all the piezoelectric element columns of the piezoelectric element member 12 are illustrated in a normal pitch configuration used as the driving piezoelectric element column 12A.
圧電素子部材12の一端部(又は両端部)には、幅広の非駆動圧電素子柱12Baを形成し、この非駆動圧電素子柱12Baの個別電極側端面にすべての駆動圧電素子柱12Aの共通電極24を接続した共通電極部25を設けている。この共通電極部25はノズル配列方向の幅が個別電極23の幅よりも広く、したがって、共通電極部25は個別電極23よりも面積が広く形成されている。また、この共通電極部25と各共通電極24との接続は、圧電素子部材12のハーフカットダイシングで分断されない内部電極22a、22bを通じて行われている。   A wide non-driving piezoelectric element column 12Ba is formed at one end (or both ends) of the piezoelectric element member 12, and the common electrode of all the driving piezoelectric element columns 12A is formed on the individual electrode side end face of the non-driving piezoelectric element column 12Ba. A common electrode part 25 is provided to which 24 is connected. The common electrode portion 25 is wider in the nozzle arrangement direction than the individual electrode 23, and thus the common electrode portion 25 is formed to have a larger area than the individual electrode 23. Further, the connection between the common electrode portion 25 and each common electrode 24 is made through internal electrodes 22 a and 22 b that are not divided by half-cut dicing of the piezoelectric element member 12.
FPC15は、基材30上に複数の個別配線電極31Aと共通配線電極31Bが形成されている。そして、圧電素子部材12の各駆動用圧電素子柱12Aの個別電極23にはFPC15の個別配線電極31Aを電気的接続部材である半田32で接合して電気的に接続し、また、圧電素子部材12の一端部側の非駆動圧電素子柱12Baに設けられた共通電極部25にはFPC15の共通配線電極31Bを同じく半田32で接合して電気的に接続している。   In the FPC 15, a plurality of individual wiring electrodes 31A and a common wiring electrode 31B are formed on a base material 30. Then, the individual wiring electrodes 31A of the FPC 15 are joined and electrically connected to the individual electrodes 23 of each driving piezoelectric element column 12A of the piezoelectric element member 12 by solder 32 which is an electrical connection member. The common wiring electrode 31B of the FPC 15 is also joined and electrically connected to the common electrode portion 25 provided on the non-driving piezoelectric element column 12Ba on the one end side of 12 by the solder 32.
ここで、FPC15の共通配線電極31Bは、1本の配線が複数に分岐して、圧電素子部材12の共通電極部25と接続する接続部15Aにおいて複数の接続部分31Baが形成されている。これらの複数の接続部分31Baは、ノズル配列方向の幅が個別配線電極31Aの幅(個別電極23の幅)よりも狭く、この例では1/2の幅としている。また、これらの複数の接続部分31Baは、個別配線電極31Aと同じピッチ(個別電極23と同じピッチ)としている。   Here, the common wiring electrode 31 </ b> B of the FPC 15 has a plurality of connection portions 31 </ b> Ba formed in a connection portion 15 </ b> A where one wiring branches into a plurality of portions and is connected to the common electrode portion 25 of the piezoelectric element member 12. The plurality of connection portions 31Ba have a width in the nozzle arrangement direction narrower than the width of the individual wiring electrode 31A (the width of the individual electrode 23), and in this example, the width is ½. The plurality of connection portions 31Ba have the same pitch as the individual wiring electrode 31A (the same pitch as the individual electrode 23).
これにより、FPC15の共通配線電極31Bの共通電極部25と接続する部分では単位面積あたりの電極面積が、個別電極23と接続する部分より小さい約1/2の面積となる。また、FPC15の共通配線電極31Bの共通電極部25と接続する部分で使用する電気的接続部材である半田32の量が、厚みが同じであれば、個別電極23と接続する部分の半田32の量より少ない約1/2の量となる。ここで、単位面積とは、FPCの電極部と非電極部を含めた一定の面積を指し、図7のように等間隔で電極部が非電極部を挟んで並んだ構成では電極部と非電極部を同数含んだ領域の面積として設定されたものである。   As a result, the electrode area per unit area in the portion connected to the common electrode portion 25 of the common wiring electrode 31 </ b> B of the FPC 15 is about ½ the area smaller than the portion connected to the individual electrode 23. Further, if the amount of solder 32 that is an electrical connection member used in the portion connected to the common electrode portion 25 of the common wiring electrode 31B of the FPC 15 is the same, the portion of the solder 32 connected to the individual electrode 23 The amount is about ½ that is less than the amount. Here, the unit area refers to a certain area including the electrode portion and the non-electrode portion of the FPC, and in the configuration in which the electrode portions are arranged at regular intervals with the non-electrode portion interposed therebetween as shown in FIG. It is set as the area of a region including the same number of electrode portions.
また、FPCの共通配線電極31Bの接続部分31Baの長さは、共通電極部25と接続する部分15Aの長さL1とこの長さL1以上の長さL2とを合わせた長さ、すなわち、接続部分31Baは共通電極部25と接続する長さの2倍以上の長さを有している構成としている。   The length of the connection portion 31Ba of the common wiring electrode 31B of the FPC is a length obtained by combining the length L1 of the portion 15A connected to the common electrode portion 25 and the length L2 equal to or longer than this length L1, that is, the connection The portion 31Ba is configured to have a length that is at least twice as long as the length connected to the common electrode portion 25.
これらの圧電素子部材12の個別電極23、共通電極部25とFPC15の各電極31A、31Bを接続する方法としては、FPC15をガラス等のレーザー透過剛性部材で加圧した状態でレーザー光をFPC15の電極31や半田32に照射して半田32を溶融硬化させることにより接合するレーザー接合法を用いている。また、電極を位置合わせして圧電素子部材12とFPC15を重ね合わせ、ヒータチップ(ブロック)でFPC15の接合部分15A裏面の基材を加圧しながらヒータチップの温度をパルス的に上昇させ半田32を溶融硬化させることにより接合するヒータ接合法等を用いることもできるが、本発明による構成は特にレーザー接合法による場合に効果的である。   As a method of connecting the individual electrodes 23 and the common electrode portion 25 of these piezoelectric element members 12 and the electrodes 31A and 31B of the FPC 15, laser light is applied to the FPC 15 in a state where the FPC 15 is pressurized with a laser transmitting rigid member such as glass. A laser bonding method is used in which the electrodes 31 and the solder 32 are irradiated to melt and harden the solder 32. In addition, the electrodes are aligned, the piezoelectric element member 12 and the FPC 15 are overlapped, and the heater chip temperature is increased in a pulsed manner while pressing the base material on the back surface of the joining portion 15A of the FPC 15 with the heater chip (block). Although a heater joining method for joining by melting and curing can be used, the configuration according to the present invention is particularly effective in the case of the laser joining method.
なお、半田32は、金属部材からなるFPC15の電極31及びFPC15の基材30に比較して低い融点を有する材料であり、かつ導電性を有する材料から構成されたものであればよく、鉛(Pb)を含有しないものであることが好ましい。たとえば、半田32としてスズ(Sn)及びビスマス(Bi)を主成分とする半田を用いることができる。鉛が含有されていないことから、環境保護の観点において効果的であるとともに、スズ(Sn)及びビスマス(Bi)が主成分の半田32は非鉛の部材の中では非常に低い融点を有していることから、FPC15及び圧電素子部材12にダメージを与えることなくFPC15の電極31A、31Bと圧電素子部材12の個別電極23及び共通電極部25とを容易に溶着することができる。   The solder 32 may be a material having a lower melting point than the electrode 31 of the FPC 15 made of a metal member and the base material 30 of the FPC 15 and made of a conductive material. Pb) is preferably not contained. For example, a solder mainly composed of tin (Sn) and bismuth (Bi) can be used as the solder 32. Since lead is not contained, it is effective from the viewpoint of environmental protection, and the solder 32 mainly composed of tin (Sn) and bismuth (Bi) has a very low melting point among non-lead members. Therefore, the electrodes 31A and 31B of the FPC 15 and the individual electrodes 23 and the common electrode portion 25 of the piezoelectric element member 12 can be easily welded without damaging the FPC 15 and the piezoelectric element member 12.
また、ここでは、電気接続部材として半田を用いたが、異方性導電膜や導電性接着剤等を用いることも出来る。また、印刷法やめっき法等により、あらかじめ、圧電素子部材12側の個別電極23、共通電極部25、または、FPCの個別配線電極31A、共通配線電極31Bの接続部分31Baに形成することができる。また、ここでは、配線部材として、FPCを用いたが、薄膜状であり互いに並列された複数の電極が設けられているものであればよく、例えば、TAB(Tape Automated Bonding)を用いることもできる。   Here, solder is used as the electrical connection member, but an anisotropic conductive film, a conductive adhesive, or the like can also be used. Further, it can be formed in advance on the individual electrode 23 on the piezoelectric element member 12 side, the common electrode portion 25, or the connection portion 31Ba of the FPC individual wiring electrode 31A and the common wiring electrode 31B by a printing method, a plating method, or the like. . Here, although FPC is used as the wiring member, it may be any film provided with a plurality of electrodes that are thin and parallel to each other. For example, TAB (Tape Automated Bonding) can also be used. .
次に、上記実施形態の構成とFPC15の共通配線電極31Bを個別配線電極と同幅にした図8及び図9に示す比較例の構成とを比較するため、レーザー接合法を用いて、圧電素子部材12の個別電極23、共通電極部25とFPC15の各電極31A、31Bを接続した。   Next, in order to compare the configuration of the above embodiment with the configuration of the comparative example shown in FIGS. 8 and 9 in which the common wiring electrode 31B of the FPC 15 has the same width as the individual wiring electrode, a piezoelectric element is used by using a laser bonding method. The individual electrodes 23 and the common electrode portion 25 of the member 12 and the electrodes 31A and 31B of the FPC 15 were connected.
この結果、上記実施形態の構成では、圧電素子部材12の個別電極23とFPC15の個別配線電極31Aの半田32が溶融し接合できるレーザー照射条件で、圧電素子部材12の共通電極部25とFPC15の共通配線電極31Bの接続部分31Baの接合ができ、圧電素子部材12とFPC15との電極の接合不良やFPC基材の損傷は生じず、良好な接合が得られた。   As a result, in the configuration of the above-described embodiment, the common electrode portion 25 of the piezoelectric element member 12 and the FPC 15 are subjected to laser irradiation conditions that allow the individual electrode 23 of the piezoelectric element member 12 and the solder 32 of the individual wiring electrode 31A of the FPC 15 to be melted and joined. The connection portion 31Ba of the common wiring electrode 31B can be bonded, and the bonding failure between the electrodes of the piezoelectric element member 12 and the FPC 15 and the damage of the FPC base material do not occur, and a good bonding is obtained.
一方、従来の構成では、同じレーザー照射条件で接合を行ったところ、個別電極23と個別配線電極31Aは問題なく接合できたが、共通電極部25と共通配線電極31Bは半田32が良好に溶融せず接合できなかった。また、共通電極部25の半田32が溶融できる照射条件で、個別電極23との接合を行うと、FPC15の基材30の膨張収縮が大きくなって接合不良が生じたり、一部基材30の損傷も生じた。   On the other hand, in the conventional configuration, when the joining was performed under the same laser irradiation conditions, the individual electrode 23 and the individual wiring electrode 31A could be joined without any problem, but the solder 32 was melted well in the common electrode portion 25 and the common wiring electrode 31B. It was not possible to join without. Further, if the bonding with the individual electrode 23 is performed under an irradiation condition in which the solder 32 of the common electrode portion 25 can be melted, the expansion / contraction of the base material 30 of the FPC 15 is increased, resulting in poor bonding, or part of the base material 30. Damage also occurred.
このように、共通電極部は個別電極よりも面積が広く形成され、配線部材の共通配線電極は、共通電極部と接続する接続部に、ノズル配列方向の幅が個別電極の幅よりも狭い複数の接続部分を有し、配線部材の単位面積当たりの共通配線電極の面積が、配線部材の単位面積当たりの個別配線電極の面積よりも少ない構成とすることで、レーザー接合を行う場合でも、レーザーによる加熱を集中し、同一速度の走査でも接合を可能とすることができ、タクトタイムもレーザー接合のメリットも犠牲にすることなく大型ヘッドへの配線部材の接合を行うことができるようになる。   Thus, the common electrode portion is formed to have a larger area than the individual electrode, and the common wiring electrode of the wiring member has a plurality of narrower widths in the nozzle arrangement direction than the width of the individual electrode at the connection portion connected to the common electrode portion. Even when laser bonding is performed, the common wiring electrode area per unit area of the wiring member is smaller than the area of the individual wiring electrode per unit area of the wiring member. It is possible to concentrate the heating due to the above, and to enable the bonding even at the same speed scanning, and to bond the wiring member to the large head without sacrificing the tact time and the merit of the laser bonding.
なお、上記実施形態では、電気的接続部材である半田32の量を共通電極部25が個別電極23より少なく約1/2としているが、FPC15などの配線部材の伸長・収縮による接合不良,過熱による配線部材の損傷,生産効率の著しい低下等の不具合の生じなければ、1/2である必要はない。   In the above embodiment, the amount of solder 32 as an electrical connection member is about ½ that the common electrode portion 25 is smaller than the individual electrode 23. However, bonding failure and overheating due to expansion / contraction of the wiring member such as the FPC 15 If there is no problem such as damage to the wiring member due to the above, or a significant reduction in production efficiency, it is not necessary to reduce to 1/2.
また、配線部材の共通配線電極と共通電極部とを接続する電気的接続部材の単位面積当たりの量を、配線部材の個別配線電極と個別電極とを接続する電気的接続部材の単位面積当たりの量よりも少ない構成とすることで、共通電極部と個別電極を同じ条件で接続でき、圧電素子と配線部材との電極の接続不良や圧電素子及び配線部材の損傷を低減することができる。   In addition, the amount per unit area of the electrical connection member that connects the common wiring electrode and the common electrode portion of the wiring member is determined per unit area of the electrical connection member that connects the individual wiring electrode and the individual electrode of the wiring member. By adopting a configuration smaller than the amount, the common electrode portion and the individual electrode can be connected under the same conditions, and the connection failure of the electrode between the piezoelectric element and the wiring member and the damage to the piezoelectric element and the wiring member can be reduced.
また、圧電素子部材の端部の共通電極部を個別電極より広くすることで、ノズルピッチが微細化し、個別電極を設けている圧電素子柱が細くなっても、圧電素子部材の端部の共通電極部を設ける圧電素子柱の幅を広くすることができ、圧電素子の強度を保つことができて、圧電素子と配線部材の接続時やその他の組立時の損傷を低減することができる。   In addition, by making the common electrode part at the end of the piezoelectric element member wider than the individual electrode, even if the nozzle pitch is reduced and the piezoelectric element column provided with the individual electrode becomes thinner, the common end of the piezoelectric element member is shared. The width of the piezoelectric element column provided with the electrode portion can be widened, the strength of the piezoelectric element can be maintained, and damage at the time of connecting the piezoelectric element and the wiring member or other assembly can be reduced.
また、配線部材の共通配線電極の共通電極部と接続する部分における単位面積あたりの電極面積を、配線部材の個別電極と接続する部分における単位面積あたりの電極面積より小さくすることで、簡単に共通電極部の電気的接続部材の量を少なくすることができ、圧電素子と配線部材との電極の接続不良や圧電素子及び配線部材の損傷を低減することができる。   In addition, the electrode area per unit area in the part connected to the common electrode part of the common wiring electrode of the wiring member can be easily shared by making the electrode area per unit area in the part connected to the individual electrode of the wiring member smaller. It is possible to reduce the amount of the electrical connection member of the electrode portion, and it is possible to reduce poor connection of the electrodes between the piezoelectric element and the wiring member and damage to the piezoelectric element and the wiring member.
また、配線部材の共通配線電極の接続部分のピッチと個別電極のピッチを同じにし、配線部材の共通配線電極の接続部分の幅を個別電極の幅より小さくすることで、ヒータチップやレーザー等の加熱ツールの熱量を共通電極部と個別電極部に均一に与えることができ、余分な熱量を低減することができる。すなわち、簡単な構成で、圧電素子と配線部材との電極の接続不良や圧電素子及び配線部材の損傷を低減することができるため、設備コストや加熱時間を短縮できる。   In addition, the pitch of the connection portions of the common wiring electrode of the wiring member is the same as the pitch of the individual electrodes, and the width of the connection portion of the common wiring electrode of the wiring member is made smaller than the width of the individual electrode, so that the heater chip, laser, etc. The amount of heat of the heating tool can be uniformly applied to the common electrode portion and the individual electrode portion, and the excess amount of heat can be reduced. That is, since the connection failure between the electrodes of the piezoelectric element and the wiring member and the damage of the piezoelectric element and the wiring member can be reduced with a simple configuration, the equipment cost and the heating time can be shortened.
また、配線部材の共通配線電極の複数の接続部分は、共通電極部と接続する長さの2倍以上の長さを有している構成とすることで、配線部材の配線に流れる熱量を少なくでき、圧電素子と配線部材との電極の接続不良や圧電素子及び配線部材の損傷を低減することができる。   In addition, the plurality of connecting portions of the common wiring electrode of the wiring member have a length that is at least twice as long as the length connected to the common electrode portion, so that the amount of heat flowing through the wiring of the wiring member is reduced. In addition, it is possible to reduce electrode connection failure between the piezoelectric element and the wiring member and damage to the piezoelectric element and the wiring member.
すなわち、共通配線電極の複数の接続部分が接続部から外れたところですぐに1本に繋がれている構成では、この繋ぎ部の熱容量が大きくなることから、配線部材の接続時の熱が前記配線を通じて前記繋ぎ部に流れ、接続部の温度を低下させてしまう。これに対して、前述のように接続部分を接続する長さよりも十分に長く構成することで、繋ぎ部の熱容量の影響を小さくすることができる。   That is, in a configuration in which a plurality of connection portions of the common wiring electrode are immediately connected to each other when they are disconnected from the connection portion, the heat capacity of the connection portion increases, so that heat at the time of connection of the wiring member is increased by the wiring. It flows to the connecting part through the terminal and lowers the temperature of the connecting part. On the other hand, the influence of the heat capacity of the joint portion can be reduced by configuring the connection portion to be sufficiently longer than the length for connecting the connection portions as described above.
次に、他の具体的な実施例について図10及び図11を参照して説明する。なお、図10はノズル配列方向と直交する方向に沿う接合状態の要部平面説明図、図11は圧電素子部材とFPCの要部正面説明図である。ここでは、圧電素子部材12の圧電素子柱はすべて駆動用圧電素子柱12Aとして使用するノーマルピッチ構成で図示している。   Next, another specific embodiment will be described with reference to FIGS. 10 is an explanatory plan view of a main part in a joined state along a direction orthogonal to the nozzle arrangement direction, and FIG. 11 is an explanatory front view of the main part of the piezoelectric element member and the FPC. Here, all the piezoelectric element columns of the piezoelectric element member 12 are illustrated in a normal pitch configuration used as the driving piezoelectric element column 12A.
FPC15の共通配線電極31Bは1本の配線が複数に分岐して接続部15Aに複数の接続部分31Baを形成し、複数の接続部分31Baの配列ピッチは個別配線電極31Aのピッチと等しく、共通配線電極31Bの接続部分31Baの幅は個別配線電極31Aの幅より小さく約2/3の幅とした。また、共通配線電極31Bの接続部分31Baの半田32の厚さを個別配線電極31Aの半田32の厚さの約2/3とした。これにより、FPC15の単位面積あたりの電気接続部材である半田32の量が、共通配線電極32の接続部分32Baが個別破線電極31Aより少なく約4/9になるようにしている。また、半田32は、FPC15の電極31A、接続部分31Baに電気めっき法により形成し、めっき時の積算電流量を個別配線電極31Aと共通配線電極31Bで変えることにより、個別配線電極31Aと共通配線電極31Bの接続部分31baの厚さを制御している。   The common wiring electrode 31B of the FPC 15 is divided into a plurality of wirings to form a plurality of connection portions 31Ba in the connection portion 15A, and the arrangement pitch of the plurality of connection portions 31Ba is equal to the pitch of the individual wiring electrodes 31A. The width of the connection portion 31Ba of the electrode 31B is smaller than the width of the individual wiring electrode 31A and is about 2/3. Further, the thickness of the solder 32 of the connection portion 31Ba of the common wiring electrode 31B is set to about 2/3 of the thickness of the solder 32 of the individual wiring electrode 31A. Thereby, the amount of the solder 32 which is an electrical connection member per unit area of the FPC 15 is set to be about 4/9 in which the connection portion 32Ba of the common wiring electrode 32 is smaller than the individual broken line electrode 31A. The solder 32 is formed on the electrode 31A and the connection portion 31Ba of the FPC 15 by electroplating, and the integrated current amount at the time of plating is changed between the individual wiring electrode 31A and the common wiring electrode 31B. The thickness of the connection portion 31ba of the electrode 31B is controlled.
前述した実施形態と同様に、レーザー接合法を用いて、圧電素子部材12の個別電極23とFPC15の個別配線電極31Aの半田32が溶融し接合できるレーザー照射条件で、圧電素子部材12の共通電極部25とFPC15の共通配線電極31Bの接続部分31Baの接合ができ、圧電素子部材12とFPC15との電極の接合不良やFPC基材の損傷は生じず、良好な接合が得られた。   Similar to the above-described embodiment, the common electrode of the piezoelectric element member 12 is used under a laser irradiation condition in which the individual electrode 23 of the piezoelectric element member 12 and the solder 32 of the individual wiring electrode 31A of the FPC 15 can be melted and bonded using the laser bonding method. The connection part 31Ba of the common wiring electrode 31B of the part 25 and the FPC 15 can be joined, and the joining of the piezoelectric element member 12 and the FPC 15 does not fail and the FPC base material is not damaged.
なお、レーザー接合法はヒータチップ等と異なり非接触加熱であるため、このように半田厚が異なり加圧面が平らでなかったとしても確実に接合することが可能となる。具体的には、レーザー照射部に空気を噴きつけて押さえながらレーザー照射することでが、非平坦面であっても均一な加圧状態での接合を行うことができる。   Since the laser bonding method is non-contact heating unlike a heater chip or the like, even if the solder thickness is different and the pressure surface is not flat, it is possible to reliably bond. Specifically, the laser irradiation is performed while spraying and pressing air on the laser irradiation portion, so that even a non-flat surface can be bonded in a uniform pressurized state.
このように、共通配線電極と共通電極部とを接続する電気接続部材の厚さを個別配線電極と個別電極とを接続する電気接続部材の厚さより薄くすることで、前記実施形態よりも共通配線電極の幅を広げることができ、共通配線電極により多くの電流を流すことができる。   Thus, by making the thickness of the electrical connection member that connects the common wiring electrode and the common electrode portion thinner than the thickness of the electrical connection member that connects the individual wiring electrode and the individual electrode, the common wiring is more than in the above embodiment. The width of the electrode can be increased, and more current can flow through the common wiring electrode.
なお、ここでは、電気的接続部材である半田32の量を共通電極部が個別電極より少なく約4/9としているが、配線部材の伸長・収縮による接合不良,過熱による配線基板の損傷,生産効率の著しい低下等の不具合の生じなければ、4/9である必要はない。   Here, the amount of solder 32, which is an electrical connection member, is about 4/9, which is less than that of the individual electrode in the common electrode portion. However, bonding failure due to expansion / contraction of the wiring member, wiring board damage due to overheating, production It does not need to be 4/9 unless a problem such as a significant decrease in efficiency occurs.
また、電気的接続部材として、半田を用い、電気めっき法により、配線部材の電極に形成しているので、簡単に共通配線電極と個別配線電極の電気的接続部材の膜厚を制御することができ、印刷法に比べ、ノズルピッチの微細化にも対応しやすい。   In addition, since solder is used as the electrical connection member and the electrode of the wiring member is formed by electroplating, the film thickness of the electrical connection member of the common wiring electrode and the individual wiring electrode can be easily controlled. It is possible to cope with the finer nozzle pitch than the printing method.
次に、本発明に係る液体吐出ヘッドを搭載する画像形成装置の一例について図12及び図13を参照して説明する。
この画像形成装置はシリアル型画像形成装置であり、左右の側板221A、221Bに横架したガイド部材である主従のガイドロッド231、232でキャリッジ233を主走査方向に摺動自在に保持し、図示しない主走査モータによってタイミングベルトを介して矢示方向(キャリッジ主走査方向)に移動走査する。
Next, an example of an image forming apparatus equipped with the liquid ejection head according to the present invention will be described with reference to FIGS.
This image forming apparatus is a serial type image forming apparatus, and a carriage 233 is slidably held in the main scanning direction by main and slave guide rods 231 and 232 which are guide members horizontally mounted on the left and right side plates 221A and 221B. The main scanning motor that does not perform moving scanning in the direction indicated by the arrow (carriage main scanning direction) via the timing belt.
このキャリッジ233には、イエロー(Y)、シアン(C)、マゼンタ(M)、ブラック(K)の各色のインク滴を吐出するための本発明に係る液体吐出ヘッドからなる記録ヘッド234a、234b(区別しないときは「記録ヘッド234」という。)を複数のノズルからなるノズル列を主走査方向と直交する副走査方向に配列し、インク滴吐出方向を下方に向けて装着している。   The carriage 233 has recording heads 234a and 234b (which are composed of liquid ejection heads according to the present invention for ejecting ink droplets of each color of yellow (Y), cyan (C), magenta (M), and black (K). When not distinguished, it is referred to as “recording head 234”). A nozzle row composed of a plurality of nozzles is arranged in the sub-scanning direction orthogonal to the main scanning direction, and is mounted with the ink droplet ejection direction facing downward.
記録ヘッド234は、それぞれ2つのノズル列を有し、記録ヘッド234aの一方のノズル列はブラック(K)の液滴を、他方のノズル列はシアン(C)の液滴を、記録ヘッド234bの一方のノズル列はマゼンタ(M)の液滴を、他方のノズル列はイエロー(Y)の液滴を、それぞれ吐出する。なお、ここでは2ヘッド構成で4色の液滴を吐出する構成としているが、各色毎の記録ヘッドを備えることもできるし、4色の液滴を吐出する複数のノズルを並べたノズル列を有する1つの記録ヘッド構成とすることもできる。   Each of the recording heads 234 has two nozzle rows. One nozzle row of the recording head 234a has black (K) droplets, the other nozzle row has cyan (C) droplets, and the recording head 234b has one nozzle row. One nozzle row ejects magenta (M) droplets, and the other nozzle row ejects yellow (Y) droplets. In this example, four-color droplets are ejected in a two-head configuration. However, a recording head for each color can be provided, and a nozzle row in which a plurality of nozzles ejecting four-color droplets are arranged. It is also possible to have a single recording head configuration.
また、キャリッジ233には、記録ヘッド234のノズル列に対応して各色のインクを供給するためのサブタンク235a、235b(区別しないときは「サブタンク235」という。)を搭載している。このサブタンク235には各色の供給チューブ236を介して、図示しない供給ユニットによって各色のインクカートリッジ210から各色のインクが補充供給される。   The carriage 233 is equipped with sub tanks 235a and 235b (referred to as “sub tank 235” when not distinguished) for supplying ink of each color corresponding to the nozzle rows of the recording head 234. The sub tank 235 is supplied with ink of each color from the ink cartridge 210 of each color via a supply tube 236 for each color by a supply unit (not shown).
一方、給紙トレイ202の用紙積載部(圧板)241上に積載した用紙242を給紙するための給紙部として、用紙積載部241から用紙242を1枚ずつ分離給送する半月コロ(給紙コロ)243及び給紙コロ243に対向し、摩擦係数の大きな材質からなる分離パッド244を備え、この分離パッド244は給紙コロ243側に付勢されている。   On the other hand, as a paper feed unit for feeding the paper 242 loaded on the paper stacking unit (pressure plate) 241 of the paper feed tray 202, a half-moon roller (feed) that feeds the paper 242 from the paper stacking unit 241 one by one. A separation pad 244 made of a material having a large coefficient of friction is provided opposite to the sheet roller 243 and the sheet feeding roller 243, and the separation pad 244 is urged toward the sheet feeding roller 243 side.
そして、この給紙部から給紙された用紙242を記録ヘッド234の下方側に送り込むために、用紙242を案内するガイド部材245と、カウンタローラ246と、搬送ガイド部材247と、先端加圧コロ249を有する押さえ部材248とを備えるとともに、給送された用紙242を静電吸着して記録ヘッド234に対向する位置で搬送するための搬送手段である搬送ベルト251を備えている。   In order to feed the sheet 242 fed from the sheet feeding unit to the lower side of the recording head 234, a guide member 245 for guiding the sheet 242, a counter roller 246, a conveyance guide member 247, and a tip pressure roller. And a conveying belt 251 which is a conveying means for electrostatically attracting the fed paper 242 and conveying it at a position facing the recording head 234.
この搬送ベルト251は、無端状ベルトであり、搬送ローラ252とテンションローラ253との間に掛け渡されて、ベルト搬送方向(副走査方向)に周回するように構成している。また、この搬送ベルト251の表面を帯電させるための帯電手段である帯電ローラ256を備えている。この帯電ローラ256は、搬送ベルト251の表層に接触し、搬送ベルト251の回動に従動して回転するように配置されている。この搬送ベルト251は、図示しない副走査モータによってタイミングを介して搬送ローラ252が回転駆動されることによってベルト搬送方向に周回移動する。   The conveyor belt 251 is an endless belt, and is configured to wrap around the conveyor roller 252 and the tension roller 253 so as to circulate in the belt conveyance direction (sub-scanning direction). In addition, a charging roller 256 that is a charging unit for charging the surface of the transport belt 251 is provided. The charging roller 256 is disposed so as to come into contact with the surface layer of the conveyor belt 251 and to rotate following the rotation of the conveyor belt 251. The transport belt 251 rotates in the belt transport direction when the transport roller 252 is rotationally driven through timing by a sub-scanning motor (not shown).
さらに、記録ヘッド234で記録された用紙242を排紙するための排紙部として、搬送ベルト251から用紙242を分離するための分離爪261と、排紙ローラ262及び排紙コロ263とを備え、排紙ローラ262の下方に排紙トレイ203を備えている。   Further, as a paper discharge unit for discharging the paper 242 recorded by the recording head 234, a separation claw 261 for separating the paper 242 from the transport belt 251, a paper discharge roller 262, and a paper discharge roller 263 are provided. A paper discharge tray 203 is provided below the paper discharge roller 262.
また、装置本体の背面部には両面ユニット271が着脱自在に装着されている。この両面ユニット271は搬送ベルト251の逆方向回転で戻される用紙242を取り込んで反転させて再度カウンタローラ246と搬送ベルト251との間に給紙する。また、この両面ユニット271の上面は手差しトレイ272としている。   A double-sided unit 271 is detachably attached to the back surface of the apparatus main body. The duplex unit 271 takes in the paper 242 returned by the reverse rotation of the transport belt 251, reverses it, and feeds it again between the counter roller 246 and the transport belt 251. The upper surface of the duplex unit 271 is a manual feed tray 272.
さらに、キャリッジ233の走査方向一方側の非印字領域には、記録ヘッド234のノズルの状態を維持し、回復するための回復手段を含む本発明に係るヘッドの維持回復装置である維持回復機構281を配置している。この維持回復機構281には、記録ヘッド234の各ノズル面をキャピングするための各キャップ部材(以下「キャップ」という。)282a、282b(区別しないときは「キャップ282」という。)と、ノズル面をワイピングするためのブレード部材であるワイパーブレード283と、増粘した記録液を排出するために記録に寄与しない液滴を吐出させる空吐出を行うときの液滴を受ける空吐出受け284などを備えている。   Further, a maintenance / recovery mechanism 281 that is a head maintenance / recovery device according to the present invention includes a recovery means for maintaining and recovering the nozzle state of the recording head 234 in the non-printing area on one side of the carriage 233 in the scanning direction. Is arranged. The maintenance / recovery mechanism 281 includes cap members (hereinafter referred to as “caps”) 282a and 282b (hereinafter referred to as “caps 282” when not distinguished) for capping each nozzle surface of the recording head 234, and nozzle surfaces. A wiper blade 283 that is a blade member for wiping the ink, and an empty discharge receiver 284 that receives liquid droplets for discharging the liquid droplets that do not contribute to recording in order to discharge the thickened recording liquid. ing.
また、キャリッジ233の走査方向他方側の非印字領域には、記録中などに増粘した記録液を排出するために記録に寄与しない液滴を吐出させる空吐出を行うときの液滴を受ける液体回収容器であるインク回収ユニット(空吐出受け)288を配置し、このインク回収ユニット288には記録ヘッド234のノズル列方向に沿った開口部289などを備えている。   In addition, in the non-printing area on the other side in the scanning direction of the carriage 233, the liquid that receives liquid droplets when performing idle ejection that ejects liquid droplets that do not contribute to recording in order to discharge the recording liquid thickened during recording or the like. An ink recovery unit (empty discharge receiver) 288 that is a recovery container is disposed, and the ink recovery unit 288 includes an opening 289 along the nozzle row direction of the recording head 234 and the like.
このように構成したこの画像形成装置においては、給紙トレイ202から用紙242が1枚ずつ分離給紙され、略鉛直上方に給紙された用紙242はガイド245で案内され、搬送ベルト251とカウンタローラ246との間に挟まれて搬送され、更に先端を搬送ガイド237で案内されて先端加圧コロ249で搬送ベルト251に押し付けられ、略90°搬送方向を転換される。   In this image forming apparatus configured as described above, the sheets 242 are separated and fed one by one from the sheet feeding tray 202, and the sheet 242 fed substantially vertically upward is guided by the guide 245, and is conveyed to the conveyor belt 251 and the counter. It is sandwiched between the rollers 246 and conveyed, and further, the leading end is guided by the conveying guide 237 and pressed against the conveying belt 251 by the leading end pressing roller 249, and the conveying direction is changed by approximately 90 °.
このとき、帯電ローラ256に対してプラス出力とマイナス出力とが交互に繰り返すように、つまり交番する電圧が印加され、搬送ベルト251が交番する帯電電圧パターン、すなわち、周回方向である副走査方向に、プラスとマイナスが所定の幅で帯状に交互に帯電されたものとなる。このプラス、マイナス交互に帯電した搬送ベルト251上に用紙242が給送されると、用紙242が搬送ベルト251に吸着され、搬送ベルト251の周回移動によって用紙242が副走査方向に搬送される。   At this time, a positive output and a negative output are alternately applied to the charging roller 256, that is, an alternating voltage is applied, and a charging voltage pattern in which the conveying belt 251 alternates, that is, in the sub-scanning direction that is the circumferential direction. , Plus and minus are alternately charged in a band shape with a predetermined width. When the sheet 242 is fed onto the conveyance belt 251 charged alternately with plus and minus, the sheet 242 is attracted to the conveyance belt 251, and the sheet 242 is conveyed in the sub scanning direction by the circumferential movement of the conveyance belt 251.
そこで、キャリッジ233を移動させながら画像信号に応じて記録ヘッド234を駆動することにより、停止している用紙242にインク滴を吐出して1行分を記録し、用紙242を所定量搬送後、次の行の記録を行う。記録終了信号又は用紙242の後端が記録領域に到達した信号を受けることにより、記録動作を終了して、用紙242を排紙トレイ203に排紙する。   Therefore, by driving the recording head 234 according to the image signal while moving the carriage 233, ink droplets are ejected onto the stopped paper 242 to record one line, and after the paper 242 is conveyed by a predetermined amount, Record the next line. Upon receiving a recording end signal or a signal that the trailing edge of the paper 242 has reached the recording area, the recording operation is finished and the paper 242 is discharged onto the paper discharge tray 203.
このように、この画像形成装置では本発明に係る液体吐出ヘッドを備えているので、接合不良がなく、記録ヘッドの信頼性が向上し、安定した記録を行うことができる。   As described above, since the image forming apparatus includes the liquid ejection head according to the present invention, there is no bonding failure, the reliability of the recording head is improved, and stable recording can be performed.
なお、上記実施形態では本発明をプリンタ構成の画像形成装置に適用した例で説明したが、これに限るものではなく、例えば、プリンタ/ファックス/コピア複合機などの画像形成装置に適用することができる。また、狭義のインク以外の液体や定着処理液などを用いる画像形成装置にも適用することができる。   In the above embodiment, the present invention has been described with reference to an example in which the present invention is applied to an image forming apparatus having a printer configuration. However, the present invention is not limited to this. For example, the present invention may be applied to an image forming apparatus such as a printer / fax / copier multifunction machine. it can. Further, the present invention can be applied to an image forming apparatus using a liquid other than the narrowly defined ink, a fixing processing liquid, or the like.
1 流路板
2 ノズル板
3 振動板
4 ノズル
6 個別液室
10 共通液室
12 圧電素子部材
12A、12B 圧電素子柱
12Ba 圧電素子柱
13 ベース部材
15 FPC(配線部材)
23 個別電極
25 共通電極部
31A 個別配線電極(接続電極)
31B 共通配線電極(接続電極)
31Ba 接続部分
32…半田部材
234…キャリッジ
235…記録ヘッド
DESCRIPTION OF SYMBOLS 1 Flow path plate 2 Nozzle plate 3 Vibration plate 4 Nozzle 6 Individual liquid chamber 10 Common liquid chamber 12 Piezoelectric element member 12A, 12B Piezoelectric element column 12Ba Piezoelectric element column 13 Base member 15 FPC (wiring member)
23 Individual electrode 25 Common electrode part 31A Individual wiring electrode (connection electrode)
31B Common wiring electrode (connection electrode)
31Ba connection part 32 ... solder member 234 ... carriage 235 ... recording head

Claims (6)

  1. 液滴を吐出するノズルが連通する複数の加圧液室に対応する複数の圧電素子と、
    前記複数の圧電素子に駆動信号を与える配線部材と、を有し、
    前記複数の圧電素子の個別電極には電気的接続部材により配線部材に設けられた個別配線電極が接続され
    前記複数の圧電素子に共通の共通電極部には電気的接続部材により前記配線部材に設けられた共通配線電極が接続され、
    前記共通電極部は前記個別電極よりも面積が広く形成され、
    前記配線部材の共通配線電極は、前記共通電極部と接続する接続部に、ノズル配列方向の幅が前記個別配線電極の幅よりも狭い複数の接続部分を有し、
    前記配線部材の単位面積当たりの共通配線電極の面積が、前記配線部材の単位面積当たりの個別配線電極の面積よりも少ない
    ことを特徴とする液体吐出ヘッド。
    A plurality of piezoelectric elements corresponding to a plurality of pressurized liquid chambers through which nozzles for discharging droplets communicate;
    A wiring member for supplying a drive signal to the plurality of piezoelectric elements,
    The individual electrodes of the plurality of piezoelectric elements are connected to individual wiring electrodes provided on the wiring member by an electrical connection member. The common electrode portion common to the plurality of piezoelectric elements is provided to the wiring member by an electrical connection member. Connected common wiring electrodes,
    The common electrode portion is formed to have a larger area than the individual electrodes,
    The common wiring electrode of the wiring member has a plurality of connection portions whose width in the nozzle arrangement direction is narrower than the width of the individual wiring electrode in the connection portion connected to the common electrode portion,
    The liquid ejection head, wherein an area of the common wiring electrode per unit area of the wiring member is smaller than an area of the individual wiring electrode per unit area of the wiring member.
  2. 前記配線部材の共通配線電極と前記共通電極部とを接続する電気的接続部材の単位面積当たりの量が、前記配線部材の個別配線電極と前記個別電極とを接続する電気的接続部材の単位面積当たりの量よりも少ないことを特徴とする請求項1に記載の液体吐出ヘッド。   The amount per unit area of the electrical connection member that connects the common wiring electrode of the wiring member and the common electrode portion is the unit area of the electrical connection member that connects the individual wiring electrode of the wiring member and the individual electrode. The liquid discharge head according to claim 1, wherein the liquid discharge head is smaller than a hit amount.
  3. 前記配線部材の共通配線電極は、前記共通電極部と接続する部分で前記複数の接続部分に分岐され、各分岐された接続部分は、前記個別配線電極と同じピッチで配置されていることを特徴とする請求項1又は2に記載の液体吐出ヘッド。   The common wiring electrode of the wiring member is branched into the plurality of connection portions at a portion connected to the common electrode portion, and each branched connection portion is arranged at the same pitch as the individual wiring electrodes. The liquid discharge head according to claim 1 or 2.
  4. 前記配線部材の共通配線電極の前記複数の接続部分は、前記共通電極部と接続する長さの2倍以上の長さを有していることを特徴とする請求項1ないし3のいずれかに記載の液体吐出ヘッド。   4. The plurality of connection portions of the common wiring electrode of the wiring member have a length that is at least twice as long as the length of the common wiring electrode connected to the common electrode portion. The liquid discharge head described.
  5. 前記配線部材の共通配線電極と前記共通電極部とを接続する前記電気的接続部材の厚みが、前記配線部材の個別配線電極と前記個別電極とを接続する前記電気的接続部材の厚みよりも薄いことを特徴とする請求項1ないし4のいずれかに記載の液体吐出ヘッド。   The thickness of the electrical connection member that connects the common wiring electrode of the wiring member and the common electrode portion is thinner than the thickness of the electrical connection member that connects the individual wiring electrode of the wiring member and the individual electrode. The liquid discharge head according to claim 1, wherein the liquid discharge head is a liquid discharge head.
  6. 請求項1ないし5のいずれかに記載の液体吐出ヘッドを備えることを特徴とする画像形成装置。   An image forming apparatus comprising the liquid discharge head according to claim 1.
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