JPH0234342A - Ink-jet head - Google Patents
Ink-jet headInfo
- Publication number
- JPH0234342A JPH0234342A JP18509588A JP18509588A JPH0234342A JP H0234342 A JPH0234342 A JP H0234342A JP 18509588 A JP18509588 A JP 18509588A JP 18509588 A JP18509588 A JP 18509588A JP H0234342 A JPH0234342 A JP H0234342A
- Authority
- JP
- Japan
- Prior art keywords
- generating member
- pressure generating
- ink
- nozzle
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 230000005291 magnetic effect Effects 0.000 claims abstract description 21
- 230000004907 flux Effects 0.000 claims abstract description 7
- 230000005489 elastic deformation Effects 0.000 abstract description 3
- 230000005298 paramagnetic effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000005499 meniscus Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 239000002907 paramagnetic material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
- B41J2/14201—Structure of print heads with piezoelectric elements
- B41J2/14282—Structure of print heads with piezoelectric elements of cantilever type
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、インクの中に浸されている圧力発生部材を変
形ぎせ、ノズル形成基板との間隙に存在するインクの圧
力を変化させてノズルからインク滴を吐出させる機構の
インクジェットヘッドに関する。Detailed Description of the Invention [Industrial Application Field] The present invention deforms a pressure generating member immersed in ink to change the pressure of ink existing in a gap with a nozzle forming substrate, thereby generating a nozzle. The present invention relates to an inkjet head having a mechanism for ejecting ink droplets from a surface.
複数のノズルを有するノズル形成基板と、ノズルの各々
と対向配置し、インクの中に浸されている圧力発生部材
とを備え、電圧印加により圧力発生部材を変形させ、ノ
ズル形成基板との間隙に存在するインクの圧力を変化さ
せて、ノズルがらインク滴を吐出させるオンデマンド型
インクジェットヘッドは、例えば特公昭６０−８９５３
号に開示されており、このインクジェット機構は、圧力
発生部材がノズル形成基板に対し概ね垂直方向に変位す
る事と、ノズルのインク流路が短い事により、インク滴
の吐出効率及び吐出安定性に優れ、かつインク中に気泡
やゴミ等が混入した場合でもその影響を受ける事無く正
常に動作し、更には、圧力発生部材が片持ちもしくは両
持ち梁状構造である事により、電気機械変換効率が高く
、低い電圧で必要とする圧力発生部材の変位をもたらす
事が出来るという特徴を有する。It includes a nozzle forming substrate having a plurality of nozzles, and a pressure generating member disposed facing each of the nozzles and immersed in ink.The pressure generating member is deformed by applying a voltage, and the pressure generating member is deformed in the gap between the nozzle forming substrate and the nozzle forming substrate. An on-demand inkjet head that ejects ink droplets from a nozzle by changing the pressure of existing ink is disclosed in Japanese Patent Publication No. 60-8953, for example.
This inkjet mechanism improves the ejection efficiency and ejection stability of ink droplets by displacing the pressure generating member in a direction approximately perpendicular to the nozzle forming substrate and by shortening the ink flow path of the nozzle. It is excellent, and operates normally without being affected even if air bubbles or dust get mixed into the ink. Furthermore, the pressure generating member has a cantilevered or double-sided structure, which improves electromechanical conversion efficiency. It has the characteristic of being able to bring about the required displacement of the pressure generating member with a high voltage and a low voltage.
従来、このタイプのインクジェットヘッドにおいては、
圧力発生部材には圧電素子と金属板の積層材を用いてお
り、電圧を印加して圧電素子を収縮させ、金属板とで形
成するバイメタル効果によって、圧力発生部材の必要変
形を得ていた。そのため、圧電素子及び金属板のヤング
率と降伏応力と寸法並びに圧電素子の圧電定数により決
定される圧力発生部材の特性の範囲内においてのみしか
インクジェット特性を振る事が出来ず、必ずしも満足の
行くインクジェット特性を獲得するに至っていなかった
。Conventionally, in this type of inkjet head,
The pressure-generating member uses a laminated material of a piezoelectric element and a metal plate.A voltage is applied to contract the piezoelectric element, and the necessary deformation of the pressure-generating member is achieved by the bimetallic effect formed by the piezoelectric element and the metal plate. Therefore, the inkjet characteristics can only be varied within the range of the properties of the pressure-generating member determined by the Young's modulus, yield stress, and dimensions of the piezoelectric element and the metal plate, as well as the piezoelectric constant of the piezoelectric element, and it is not always possible to achieve satisfactory inkjet properties. It had not yet acquired the characteristics.
本発明の目的は、この技術課題を解決して、従来は得る
事が出来なかった様な圧力発生部材の特性を実現する為
の構造を提案し、その結果として、著しく性能の向上し
たインクジェットヘッドを提供する事にある。The purpose of the present invention is to solve this technical problem and propose a structure for realizing characteristics of a pressure generating member that could not be obtained conventionally, and as a result, an inkjet head with significantly improved performance. The goal is to provide the following.
本発明におけるインクジェットヘッドは、複数のノズル
を有するノズル形成基板と、ノズルの各々と対向配置し
、インクの中に浸されている圧力発生部材とを備え、電
圧印加により、圧力発生部材を変形させ、ノズル形成基
板との間隙に存在するインクの圧力を変化させてノズル
からインク滴を吐出させるインクジェットヘッドであっ
て、電圧印加により、圧力発生部材を貫く磁・気回路の
磁束に変化が生じる如き構造を有する事を特徴とする。An inkjet head according to the present invention includes a nozzle forming substrate having a plurality of nozzles, and a pressure generating member disposed facing each of the nozzles and immersed in ink, and deforms the pressure generating member by applying a voltage. , an inkjet head that ejects ink droplets from a nozzle by changing the pressure of ink existing in a gap with a nozzle forming substrate, in which the application of voltage causes a change in the magnetic flux of a magnetic circuit passing through a pressure generating member. It is characterized by having a structure.
本発明の上記の構成によれば、電圧印加により、圧力発
生部材を貫く磁気回路の磁束の変化が、圧力発生部材の
弾性的変形を引き起こし、ノズル形成基板との間隙に存
在するインクの圧力を変化させてノズルからインク滴を
吐出させる。According to the above configuration of the present invention, when a voltage is applied, a change in the magnetic flux of the magnetic circuit passing through the pressure generating member causes elastic deformation of the pressure generating member, and the pressure of the ink existing in the gap with the nozzle forming substrate is reduced. to eject ink droplets from the nozzle.
本発明における実施例を、図面に基づき説明する。 Embodiments of the present invention will be described based on the drawings.
第１図は、本発明におけるインクジェットヘッドを搭載
した記録装置の一実施例を説明するための斜視図である
。記録媒体１は、送りローラー２・３の押圧によりプラ
テン４に捲き回され、記録の進行に従い矢印５の方向に
搬送される。ガイド軸６・７に案内されプラテン４の軸
と平行な方向に移動可能なキャリッジ８上には、複数の
ノズルを有するインクジェットヘッド９が搭載されてお
り、矢印１０の方向に移動しつつ各々のノズルからイン
ク滴を吐出して記録媒体上にインク像を形成する。FIG. 1 is a perspective view for explaining an embodiment of a recording apparatus equipped with an inkjet head according to the present invention. The recording medium 1 is wound around the platen 4 by the pressure of the feed rollers 2 and 3, and is conveyed in the direction of the arrow 5 as recording progresses. An inkjet head 9 having a plurality of nozzles is mounted on a carriage 8 that is guided by guide shafts 6 and 7 and movable in a direction parallel to the axis of the platen 4. The inkjet head 9 has a plurality of nozzles. An ink image is formed on a recording medium by ejecting ink droplets from a nozzle.
第２図（ａ） （ｂ） （ｃ）は、本発明の第
一の実施例におけるインクジェットヘッドの構造並びに
インク滴の吐出原理を説明するためのヘッド断面図であ
る。本ヘッドは、常磁性金属板から成るノズル形成基板
１１に、複数のノズル１２が設けられ、各々のノズル１
２には、ノズル形成基板１１側に第２図（ｂ）に示され
る様な電極パターン１３を有する圧力発生部材１４が対
向配置され、インク１５中に浸された構造となっている
（第２図（ａ））。電極パターン１３に電圧１６を印加
すると電流が流れ、圧力発生部材１４からノズル形成基
板１１へ貫く磁気回路が形成され、圧力発生部材１４は
ノズル形成基板１１の方向へ変形する。この変形によっ
て圧力発生部材１４とノズル形成基板１１との間隙１９
に存在するインクの圧力が高まり、ノズル１２からイン
ク滴１７が吐出する（第２図（Ｃ））。FIGS. 2(a), 2(b), and 2(c) are head sectional views for explaining the structure of an inkjet head and the principle of ejecting ink droplets in the first embodiment of the present invention. In this head, a plurality of nozzles 12 are provided on a nozzle forming substrate 11 made of a paramagnetic metal plate, and each nozzle 1
2, a pressure generating member 14 having an electrode pattern 13 as shown in FIG. Figure (a)). When a voltage 16 is applied to the electrode pattern 13, a current flows, a magnetic circuit is formed that extends from the pressure generating member 14 to the nozzle forming substrate 11, and the pressure generating member 14 is deformed in the direction of the nozzle forming substrate 11. Due to this deformation, the gap 19 between the pressure generating member 14 and the nozzle forming substrate 11
The pressure of the ink existing in the area increases, and an ink droplet 17 is ejected from the nozzle 12 (FIG. 2(C)).
第３図は、圧力発生部材１４上の電極パターン１３の別
の形状を示す図である。本実施例における電極パターン
は、渦巻き状であり、パターンの交差部１８は、間に電
気絶縁体を介しての立体交差構造となっている０本電極
パターンでは、同じ電流量でもアンペアターンが大きく
なるので、第一の実施例における電極パターンよりも大
きな磁気力が発生出来、インクジェット特性を更に向上
させる。FIG. 3 is a diagram showing another shape of the electrode pattern 13 on the pressure generating member 14. The electrode pattern in this embodiment has a spiral shape, and the intersection portion 18 of the pattern has a three-dimensional intersection structure with an electric insulator in between.In the zero electrode pattern, the ampere turn is large even with the same amount of current. Therefore, a larger magnetic force can be generated than the electrode pattern in the first embodiment, further improving the inkjet characteristics.
第４図は、本発明の第三の実施例におけるインクジェッ
トヘッドの構造並びにインク滴の吐出原理を説明するた
めのヘッド断面図である。図中、第２図（ａ） （
ｂ） ・ ＜ｃ＞と同じ構成要素には、同一の番号が
付しである。本実施例におけるインクジェットヘッドは
、ノズル形成基板１１が非磁性金属板であり、常磁性体
で形成された圧力発生部材１４・カバー２０・２１のル
ープには、共通永久磁石２２が発生する磁束の磁気回路
が構成され、圧力発生部材１３は、弾性エネルギーを貯
えた状態で、カバー２１の突起部２３に吸引待機してい
る。圧力発生部材１４を貫く各々の磁気回路には、コイ
ル２４が巻いてあり、電圧１６を印加すると、磁束が弱
まり、圧力発生部材１４は、ノズル形成基板１１の方向
へ戻る如く変形し、この変形によって圧力発生部材１４
とノズル形成基板１１との間隙１９に存在するインクの
圧力が高まり、ノズル１２からインク滴が吐出する（図
示せず）。本、実施例におけるインクジェットヘッドに
おいては、予め蓄えておいた弾性エネルギーを開放する
事によってインク滴を吐出する為、第一の実施例におけ
るインクジェットヘッドよりもインク滴の吐出エネルギ
ーを大きくする事が出来、インクジェット特性がより向
上する。また、本構成の場合には、圧力発生部材として
、例えば、櫛歯形状の無垢の磁性金属板を利用出来る為
、部品精度の確保の点で有利となる。FIG. 4 is a cross-sectional view of the inkjet head for explaining the structure of the inkjet head and the principle of ejecting ink droplets in a third embodiment of the present invention. In the figure, Figure 2 (a) (
b) - The same components as <c> are given the same numbers. In the inkjet head in this embodiment, the nozzle forming substrate 11 is a non-magnetic metal plate, and the loop of the pressure generating member 14 and the covers 20 and 21 formed of paramagnetic material has a common permanent magnet 22 that absorbs the magnetic flux generated. A magnetic circuit is configured, and the pressure generating member 13 is waiting to be attracted to the protrusion 23 of the cover 21 while storing elastic energy. A coil 24 is wound around each magnetic circuit passing through the pressure generating member 14, and when a voltage 16 is applied, the magnetic flux is weakened and the pressure generating member 14 is deformed so as to return toward the nozzle forming substrate 11, and this deformation Pressure generating member 14
The pressure of the ink existing in the gap 19 between the nozzle forming substrate 11 and the nozzle forming substrate 11 increases, and ink droplets are ejected from the nozzle 12 (not shown). In the inkjet head of this embodiment, ink droplets are ejected by releasing elastic energy stored in advance, so the ejection energy of ink droplets can be made larger than that of the inkjet head of the first embodiment. , the inkjet properties are further improved. Further, in the case of this configuration, for example, a comb-shaped solid magnetic metal plate can be used as the pressure generating member, which is advantageous in terms of ensuring component precision.
なお、これらの実施例においては全て、圧力発生部材を
ノズル形成基板の方向へ変形させ、圧力発生部材とノズ
ル形成基板との間隙に存在するインクの圧力を高めて、
ノズルからインク滴を吐出させる、所謂「押し打ち法」
を例にとったが、本発明は、先ず圧力発生部材をノズル
形成基板と逆の方向へ変形させ、ノズルからインクメニ
スカスを引き込んだ後、インクメニスカスが復帰すると
同期させて、圧力発生部材をノズル形成基板の方向へ変
形させる事によってインク滴を吐出させる、所謂ｒ引き
打ち法」にも適用出来る事は明白である。In all of these embodiments, the pressure generating member is deformed in the direction of the nozzle forming substrate to increase the pressure of the ink existing in the gap between the pressure generating member and the nozzle forming substrate.
The so-called "push method" in which ink droplets are ejected from a nozzle.
However, in the present invention, the pressure generating member is first deformed in the opposite direction to the nozzle forming substrate, the ink meniscus is drawn in from the nozzle, and then the pressure generating member is deformed into the nozzle in synchronization with the return of the ink meniscus. It is obvious that it can also be applied to the so-called "pulling method" in which ink droplets are ejected by deforming the ink droplet in the direction of the forming substrate.
以上述べたように、本発明によれば、電圧印加により、
圧力発生部材を貫く磁気回路の磁束の変化で生じさせ、
圧力発生部材の弾性的変形を引き起こし、ノズル形成基
板との間隙に存在するインクの圧力を変化させてノズル
からインク滴を吐出させる為、従来の、圧電素子・と金
属板の積層材で構成されていた圧力発生部材の特性とは
基本的に異なる、これまでは実現不可能だった圧力発生
部材特性を設計出来る結果、著しく性能の向上したイン
クジェットヘッドが実現可能となる。As described above, according to the present invention, by applying a voltage,
Produced by changes in the magnetic flux of the magnetic circuit that penetrates the pressure-generating member,
In order to eject ink droplets from the nozzle by causing elastic deformation of the pressure generating member and changing the pressure of the ink existing in the gap between the nozzle forming substrate and the nozzle forming substrate, a conventional laminate consisting of a piezoelectric element and a metal plate is used. As a result of being able to design pressure-generating member characteristics that are fundamentally different from the characteristics of the pressure-generating member that were previously unrealizable, it becomes possible to realize an inkjet head with significantly improved performance.
第１図は、本発明におけるインクジェットヘッドを搭載
した記録装置の一実施例を説明するための斜視図、第２
図（ａ） ・ （ｂ ’） ・ （Ｃ）は、本発明
の第一の実施例におけるインクジェットヘッドの構造並
びにインク滴の吐出原理を説明するためのヘッド断面図
、第３図は、圧力発生部材上の電極パターンの別の形状
を示す図、第４図は、本発明の第三の実施例におけるイ
ンクジェットヘッドの構造並びにインク滴の吐出原理を
説明するためのヘッド断面図。
１・・・記録媒体
９・・・インクジェットヘッド
ト・・ノズル形成基板
２・・・ノズル １３・・・電極パターン４・・
・圧力発生部材 １５・・・インク６・・・電圧
１７・・・インク滴９・・・間隙 １９・
・・共通永久磁石３・・・コイル
以上
第４図
第３図
了
１１− ノス゛ル形広某橿
２２：共ゑ永又功ゐ
２４：コイル
（ｂン
（Ｃ）FIG. 1 is a perspective view for explaining one embodiment of a recording device equipped with an inkjet head according to the present invention, and FIG.
Figures (a), (b'), and (C) are head cross-sectional views for explaining the structure of the inkjet head and the principle of ejecting ink droplets in the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the inkjet head for explaining the structure of the inkjet head and the principle of ejecting ink droplets in a third embodiment of the present invention, which shows another shape of the electrode pattern on the member. 1... Recording medium 9... Inkjet head... Nozzle forming substrate 2... Nozzle 13... Electrode pattern 4...
・Pressure generating member 15... Ink 6... Voltage
17... Ink drop 9... Gap 19.
・・Common permanent magnet 3... Coil or more Figure 4 Figure 3 End 11- Nozzle type wide rod 22: Common permanent magnet 24: Coil (b-n (C)
Claims (3)
ズルの各々と対向配置し、インクの中に浸されている圧
力発生部材とを備え、電圧印加により、前記圧力発生部
材を変形させ、前記ノズル形成基板との間隙に存在する
インクの圧力を変化させて前記ノズルからインク滴を吐
出させるインクジェットヘッドにおいて、 前記電圧印加により、前記圧力発生部材を貫く磁気回路
の磁束に変化が生じる如き構造を有する事を特徴とする
インクジェットヘッド。(1) A nozzle forming substrate having a plurality of nozzles, and a pressure generating member disposed facing each of the nozzles and immersed in ink, and deforming the pressure generating member by applying a voltage, The inkjet head ejects ink droplets from the nozzle by changing the pressure of the ink existing in a gap with the nozzle forming substrate, and the inkjet head has a structure in which the application of the voltage causes a change in the magnetic flux of the magnetic circuit passing through the pressure generating member. An inkjet head characterized by having:
ノズル形成基板側に構成されている事を特徴とする請求
項１記載のインクジェットヘッド。(2) The inkjet head according to claim 1, wherein the magnetic circuit passing through the pressure generating member is constructed on the nozzle forming substrate side of the pressure generating member.
ノズル形成基板側と逆側に構成されている事を特徴とす
る請求項１記載のインクジェットヘッド。(3) The inkjet head according to claim 1, wherein the magnetic circuit passing through the pressure generating member is configured on a side of the pressure generating member opposite to the nozzle forming substrate side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18509588A JPH0234342A (en) | 1988-07-25 | 1988-07-25 | Ink-jet head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18509588A JPH0234342A (en) | 1988-07-25 | 1988-07-25 | Ink-jet head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0234342A true JPH0234342A (en) | 1990-02-05 |
Family
ID=16164757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18509588A Pending JPH0234342A (en) | 1988-07-25 | 1988-07-25 | Ink-jet head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0234342A (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0999933A1 (en) * | 1997-07-15 | 2000-05-17 | Silverbrook Research Pty. Limited | Magnetic-field-acutated ink jet nozzle |
| US7125103B2 (en) | 1997-07-15 | 2006-10-24 | Silverbrook Research Pty Ltd | Fluid ejection device with a through-chip micro-electromechanical actuator |
| US7178903B2 (en) | 1997-07-15 | 2007-02-20 | Silverbrook Research Pty Ltd | Ink jet nozzle to eject ink |
| US7287834B2 (en) | 1997-07-15 | 2007-10-30 | Silverbrook Research Pty Ltd | Micro-electromechanical ink ejection device with an elongate actuator |
| AU2006202041B2 (en) * | 1997-07-15 | 2007-11-01 | Zamtec Limited | Inkjet nozzle with solenoid actuator |
| US7387365B2 (en) | 1997-07-15 | 2008-06-17 | Silverbrook Research Pty Ltd | Nozzle for an inkjet printer incorporating a plunger assembly |
| US7497555B2 (en) | 1998-07-10 | 2009-03-03 | Silverbrook Research Pty Ltd | Inkjet nozzle assembly with pre-shaped actuator |
| US7553001B2 (en) | 1997-07-15 | 2009-06-30 | Silverbrook Research Pty Ltd | Inkjet printhead with laterally reciprocating paddle |
| US7658473B2 (en) | 1997-07-15 | 2010-02-09 | Silverbrook Research Pty Ltd | Inkjet printhead with arcuate actuator path |
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-
1988
- 1988-07-25 JP JP18509588A patent/JPH0234342A/en active Pending
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