JPH03112662A - Ink jet printer - Google Patents
Ink jet printerInfo
- Publication number
- JPH03112662A JPH03112662A JP25085789A JP25085789A JPH03112662A JP H03112662 A JPH03112662 A JP H03112662A JP 25085789 A JP25085789 A JP 25085789A JP 25085789 A JP25085789 A JP 25085789A JP H03112662 A JPH03112662 A JP H03112662A
- Authority
- JP
- Japan
- Prior art keywords
- ink
- pressure
- jet
- nozzles
- nozzle
- 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
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 abstract description 5
- 238000007639 printing Methods 0.000 abstract description 5
- 230000007423 decrease Effects 0.000 abstract description 2
- 230000033228 biological regulation Effects 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 17
- 239000007924 injection Substances 0.000 description 17
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Abstract
PURPOSE:To obtain a small sized high printing density ink jet printer which is high in jet capacity by a method wherein a plurality of ink nozzles are arranged to one ink gun, and a valve mechanism which controls jet of ink is equipped to each ink nozzle. CONSTITUTION:For instance, eight nozzles 104 are arranged to one ink gun which is equipped with eight jet control valves 103. Jet pressure according to printing density is applied as common internal pressure in the direction 108 from an ink supply passage 106, which supplies liquid ink 102 and besides, generates fundamental pressure for jetting in its inside. Though a jet control valve 103 for each nozzle 104 is opened and closed based on a recording data, when internal pressure in the ink 102 is insufficient based on the number of nozzles to be jetted in that case, a regulation pressure generating mechanism 101 makes up for the shorted internal pressure. When jetting from the nozzle 104 is ended and the regulation pressure generating mechanism 101 returns to a stationary state, the internal pressure of the ink 102 decreases, and a pressure regulation valve 105 opens. The ink is supplied again from the ink supply passage 106 to prepare for next jet.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、オンデマンド型のインクジェットプリンタに
おける、ヘッド機構に関わる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head mechanism in an on-demand inkjet printer.
［従来の技術］
オンデマンド型のインクジェットプリンタのインクガン
（インク噴射機構）に間しては、従来からピエゾ素子を
利用した物が多数製品化されている。ピエゾ素子は、電
圧によフて機械的な変形がおこる性質を利用した素子で
ある。インクガンの構造は、インクハウジングの一部に
、このピエゾ素子を貼り付け、ピエゾ素子の伸縮を電圧
で制御することにより、インクハウジングを変形させ、
内圧を発生させて、ノズルからインクを噴射させる原理
を用いたもので、いわば一種のマイクロホンブと考える
ことができる。[Prior Art] Many ink guns (ink ejection mechanisms) for on-demand inkjet printers have been manufactured using piezo elements. A piezo element is an element that takes advantage of the property that mechanical deformation occurs due to voltage. The structure of the ink gun is that this piezo element is attached to a part of the ink housing, and the expansion and contraction of the piezo element is controlled by voltage to deform the ink housing.
It uses the principle of generating internal pressure to eject ink from a nozzle, and can be thought of as a type of microphone.
ところで、ドツトプリンタでは、ノズルの本数は、印字
品質と関わるため、１つの印字ヘッド当たり複数個のノ
ズルが必要となってくる。これまでは、インクガンの個
数とインクノズルの本数は１対１に限られていたため、
ノズルの本数と同じ数だけインクガンが必要であフた。By the way, in a dot printer, the number of nozzles is related to print quality, so a plurality of nozzles are required for one print head. Until now, the number of ink guns and number of ink nozzles was limited to one to one, so
I needed as many ink guns as there were nozzles.
［発明が解決しようとする課Ｂ］
さて、プリンタの印字品質を高めるためには、記録密度
を向上させる、即ち、プリンタヘッドの密度を高めるこ
とが必要になってくる。従来技術のインクジェットプリ
ンタにおいては、ノズルの本数を増やすためには、イン
クガンを増やす必要があり、そのためには、インクガン
をどれだけ小さくできるかが鍵となる。しかしながら、
ピエゾ素子の伸縮量は、極めて小さいため、然るべき噴
射能力を備えたまま、インクガンを小型化するには、製
造上の限界があった。[Problem B to be Solved by the Invention] Now, in order to improve the printing quality of a printer, it is necessary to improve the recording density, that is, to increase the density of the printer head. In conventional inkjet printers, in order to increase the number of nozzles, it is necessary to increase the number of ink guns, and the key to this is how small the ink guns can be made. however,
Since the amount of expansion and contraction of the piezo element is extremely small, there is a manufacturing limit to downsizing the ink gun while maintaining the appropriate jetting ability.
本発明の目的は噴射能力の高い、小型で印字密度の高い
インクジェットプリンタを提供することにある。An object of the present invention is to provide an inkjet printer with high jetting ability, small size, and high printing density.
［課題を解決するための手段］
そこで、本発明では、上記課題を解決するために、少な
くとも１つ以上複数のインクガンを備えたインクジェッ
トプリンタにおいて、１つのインクガンにつき、少なく
とも２本以上複数のインクノズルを配し、各々のインク
ノズルには、インクの噴射を制御するために、弁機構を
備えたことを特徴とし、
更に、前記弁機構は、圧電材料または電歪材料を用いて
構成されることを特徴とし、
更に、前記インクガンは、印字濃度を調整するためのイ
ンク噴射量制御機構の他に、該インクガンに配されたイ
ンクノズルのうち、噴射を行うインクノズルの本数に応
じて、インクの噴射圧を制御する機構を備えたことを特
徴とする。[Means for Solving the Problems] Therefore, in the present invention, in order to solve the above problems, in an inkjet printer equipped with at least one or more ink guns, at least two or more ink nozzles per one ink gun are provided. each ink nozzle is provided with a valve mechanism for controlling the ejection of ink, and further, the valve mechanism is configured using a piezoelectric material or an electrostrictive material. Further, the ink gun has an ink ejection amount control mechanism for adjusting print density, and an ink ejection amount control mechanism according to the number of ink nozzles that eject out of the ink nozzles arranged in the ink gun. It is characterized by being equipped with a mechanism for controlling injection pressure.
［作 用］
つまり、本発明においては、インクガンの個数を増やす
こと無く、インクノズルの本数を増やすことが可能なら
ば、インクガンの大きさには、こだわる必要はないわけ
であり、しかも、従来の技術では、ピエゾ素子を圧力発
生機構として用いているために、小型化に関しては制約
が生じたが、もし、ピエゾ素子を圧力発生のためでなく
、弁機構として用いた場合には、小型化は極めて容易と
なることが考えられる。例えば、身近な例として、噴霧
器を考えてみれば良い。ポンプ機構を一体化した噴霧器
は、どれだけ小型化しても、長時間携帯して使い続ける
ことはできない。ところが、動力噴霧器のように、装置
全体は重くても、持ち運ぶのが弁機構の付いたノズル部
分だけであれば、長時間使い続けても苦にはならない。[Function] In other words, in the present invention, if it is possible to increase the number of ink nozzles without increasing the number of ink guns, there is no need to be particular about the size of the ink gun, and moreover, there is no need to be particular about the size of the ink gun. In this technology, piezo elements are used as pressure generation mechanisms, which limits miniaturization.However, if piezo elements were used not for pressure generation but as valve mechanisms, miniaturization would be possible. It is conceivable that this would be extremely easy. For example, consider a sprayer as a familiar example. No matter how compact a sprayer with an integrated pump mechanism is, it cannot be carried around and used for long periods of time. However, even if the entire device is heavy like a power sprayer, if all you have to carry is the nozzle with the valve mechanism, it will not be a problem to use it for a long time.
つまり、ポンプ機構まで含めて小型化することより、ノ
ズル部分だけを小型化する方が得策であるといえるので
ある。In other words, it is better to downsize only the nozzle portion than to downsize the pump mechanism as well.
［実施例］
以下に本発明の実施例を図面に基づいて説明する。第１
図は、本実施例におけるインクガンの内部構造を示す図
である。１０１は、調整圧力発生機構であり、バイモル
フ変位素子を用いて作られている。バイモルフ変位素子
は、後述する原理により、印可電圧を調整することで、
１０７に示す点線の位置まで変位するよう、変形する。[Example] Examples of the present invention will be described below based on the drawings. 1st
The figure is a diagram showing the internal structure of the ink gun in this embodiment. Reference numeral 101 denotes a regulating pressure generating mechanism, which is made using a bimorph displacement element. The bimorph displacement element uses the principle described below to adjust the applied voltage.
It is deformed so that it is displaced to the position indicated by the dotted line 107.
この変形により、液体インク１０２の内部圧力を変化さ
せることができる。１０３はノズル毎の噴射制御弁であ
り、１０４は噴射ノズルである。本実施例では、１つの
インクガンに付き、８本のノズルを配している。このた
め、第１図では１０３の噴射制御弁は８個示されている
。１０５は、加圧調整弁であり、１０６は、インク供給
路である。This deformation allows the internal pressure of the liquid ink 102 to be changed. 103 is an injection control valve for each nozzle, and 104 is an injection nozzle. In this embodiment, one ink gun is provided with eight nozzles. For this reason, eight injection control valves 103 are shown in FIG. 105 is a pressure adjustment valve, and 106 is an ink supply path.
さて、１０１の調整圧力発生機構は、インクの噴射のた
めの全ての圧力を発生するわけではない。Now, the adjustment pressure generation mechanism 101 does not generate all the pressure for ink jetting.
印字濃度に応じた噴射圧力は、１０６のインク供給路か
ら、共通の内部圧力として１０８の方向に加えられてお
り、１０２にインクを供給するとともに、その内部に噴
射の為の基本圧力を発生させる。ノズル毎の噴射制御弁
は、後述するメカニズムにより、記録データに応じて、
開閉することになるが、その際、噴射が行われるノズル
の本数によっては、１０２における内部圧力が不足する
ことが考えられる。１０１の調整圧力発生機構は、この
不足した内部圧力を補うために設けられているのである
。Ejection pressure according to print density is applied from the ink supply path 106 in the direction 108 as a common internal pressure, and supplies ink to 102 and generates basic pressure for ejection inside it. . The injection control valve for each nozzle is controlled according to the recorded data by the mechanism described later.
Although the nozzles 102 are opened and closed, the internal pressure at 102 may be insufficient depending on the number of nozzles through which injection is performed. The regulating pressure generating mechanism 101 is provided to compensate for this insufficient internal pressure.
ノズルからの噴射が終わり、１０１の調整圧力発生機構
が定常状態に戻ると、１０２の内部圧力が低下し、加圧
調整弁１０５が開き、１０６のインク供給路から再びイ
ンクが供給され、１０２の内部に満たされ、次の噴射に
備える。以下、このサイクルが繰り返されて行くことに
なる。When the ejection from the nozzle ends and the regulating pressure generating mechanism 101 returns to a steady state, the internal pressure of 102 decreases, the pressure regulating valve 105 opens, and ink is again supplied from the ink supply path 106. The inside is filled and ready for the next injection. From then on, this cycle will be repeated.
次に、第２図と第３図を用いて、噴射制御弁の動作を説
明する。第２図と第３図は、ともに、インクガンの内部
を上方から見た様子を示しているが、第２図は、噴射制
御弁が閉じている状態を、また、第３図は、噴射制御弁
が開いている状態をそれぞれ示している。２０１が液体
インク、２０２が噴射制御弁、２０３が噴射ノズルであ
る。噴射制御弁２０２は、前述の調整圧力発生機構と同
様に、ピエゾ素子で作られるバイモルフであり、所定の
電圧が印可されると３０１に示すように変形し、液体イ
ンクに加えられている内部圧力によって、所定量のイン
ク３０２が噴射される。Next, the operation of the injection control valve will be explained using FIGS. 2 and 3. Both Figures 2 and 3 show the inside of the ink gun as seen from above. Figure 2 shows the state where the injection control valve is closed, and Figure 3 shows the state where the injection control valve is closed. Each valve is shown in an open state. 201 is liquid ink, 202 is an injection control valve, and 203 is an injection nozzle. The injection control valve 202 is a bimorph made of a piezo element, similar to the above-mentioned regulating pressure generation mechanism, and when a predetermined voltage is applied, it deforms as shown at 301 to reduce the internal pressure applied to the liquid ink. As a result, a predetermined amount of ink 302 is ejected.
第４図は、前述のバイモルフに関する説明のための図で
ある。４０１はシムと呼ばれる弾性板であり、−船釣に
は燐青銅などの材質で作られることが多い。４０２と４
０３は圧電セラミックであり、４０１シムに接着されて
いる。このように３層が一体となって構成された物をバ
イモルフ変位素子と呼び、代表的な圧電アクチュエータ
となっている。 さて、バイモルフ変位素子に、４０５
の直流電源と４０６の可変抵抗器を使って、所定の電圧
を印可すると、４０４の点線に示す変形が起こる。この
時の変形量は印可電圧を調整することで、一定の範囲内
で調整することが可能である。FIG. 4 is a diagram for explaining the above-mentioned bimorph. 401 is an elastic plate called a shim, which is often made of a material such as phosphor bronze for boat fishing. 402 and 4
03 is a piezoelectric ceramic and is bonded to the 401 shim. A device constructed by integrating three layers in this manner is called a bimorph displacement element, and is a typical piezoelectric actuator. Now, for the bimorph displacement element, 405
When a predetermined voltage is applied using the DC power supply 406 and the variable resistor 406, the deformation shown by the dotted line 404 occurs. The amount of deformation at this time can be adjusted within a certain range by adjusting the applied voltage.
バイモルフ変位素子に代表される圧電アクチュエータは
、製造が容易であり、しかも消費電力が少ない。Piezoelectric actuators, typified by bimorph displacement elements, are easy to manufacture and consume less power.
［発明の効果］
以上述べてきた通り、本発明によれば、ピエゾ素子を噴
射圧力の発生に使うのではなく、制御弁として使用する
ため、製造が容易であること、小型化、高密度化が容易
であることなどの便れた特徴を備えたインクジェットプ
リンタ用ヘッドが構成できる。[Effects of the Invention] As described above, according to the present invention, the piezo element is not used to generate injection pressure but is used as a control valve, so manufacturing is easy, miniaturization, and high density. It is possible to construct an inkjet printer head with convenient features such as ease of printing.
第１図は、本発明に基づ〈実施例の内部構造を示す断面
図である。第２図は、噴射制御弁の動作説明のための、
閉状態における断面図であり、第３図は同じく、開状態
における断面図である。第４図は、バイモルフ変位素子
の説明のための動作原理に関する図である。
１０１ 調整圧力発生機構
１０２ 液体インク
１０３ インク噴射制御弁
１０４ インク噴射ノズル
１０５ 加圧調整弁
１０６ インク供給路
１０７ 調整圧力発生機構の変形位置
１０８ 内部圧力の加圧方向
以 上FIG. 1 is a sectional view showing the internal structure of an embodiment based on the present invention. Figure 2 is for explaining the operation of the injection control valve.
FIG. 3 is a sectional view in the closed state, and FIG. 3 is a sectional view in the open state. FIG. 4 is a diagram related to the operating principle for explaining the bimorph displacement element. 101 Adjustment pressure generation mechanism 102 Liquid ink 103 Ink injection control valve 104 Ink injection nozzle 105 Pressure adjustment valve 106 Ink supply path 107 Deformation position of adjustment pressure generation mechanism 108 Pressure direction of internal pressure and above
Claims (3)
ンクジェットプリンタにおいて、１つのインクガンにつ
き、少なくとも２本以上複数のインクノズルを配し、各
々のインクノズルには、インクの噴射を制御するために
、弁機構を備えたことを特徴とするインクジェットプリ
ンタ。(1) In an inkjet printer equipped with at least one or more ink guns, at least two or more ink nozzles are arranged for each ink gun, and each ink nozzle has a An inkjet printer characterized by being equipped with a valve mechanism.
構成されることを特徴とする請求項１記載のインクジェ
ットプリンタ。(2) The inkjet printer according to claim 1, wherein the valve mechanism is constructed using a piezoelectric material or an electrostrictive material.
ンク噴射量制御機構の他に、該インクガンに配されたイ
ンクノズルのうち、噴射を行うインクノズルの本数に応
じて、インクの噴射圧を制御する機構を備えたことを特
徴とする請求項１記載のインクジェットプリンタ。(3) In addition to the ink ejection amount control mechanism for adjusting print density, the ink gun controls the ink ejection pressure according to the number of ink nozzles that eject out of the ink nozzles arranged in the ink gun. The inkjet printer according to claim 1, further comprising a control mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25085789A JPH03112662A (en) | 1989-09-27 | 1989-09-27 | Ink jet printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25085789A JPH03112662A (en) | 1989-09-27 | 1989-09-27 | Ink jet printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03112662A true JPH03112662A (en) | 1991-05-14 |
Family
ID=17214040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25085789A Pending JPH03112662A (en) | 1989-09-27 | 1989-09-27 | Ink jet printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03112662A (en) |
Cited By (62)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0999934A1 (en) * | 1997-07-15 | 2000-05-17 | Silver Brook Research Pty, Ltd | A thermally actuated ink jet |
| US6746105B2 (en) | 1997-07-15 | 2004-06-08 | Silverbrook Research Pty. Ltd. | Thermally actuated ink jet printing mechanism having a series of thermal actuator units |
| US6776476B2 (en) | 1997-07-15 | 2004-08-17 | Silverbrook Research Pty Ltd. | Ink jet printhead chip with active and passive nozzle chamber structures |
| US6783217B2 (en) | 1997-07-15 | 2004-08-31 | Silverbrook Research Pty Ltd | Micro-electromechanical valve assembly |
| US6786570B2 (en) | 1997-07-15 | 2004-09-07 | Silverbrook Research Pty Ltd | Ink supply arrangement for a printing mechanism of a wide format pagewidth inkjet printer |
| US6824251B2 (en) | 1997-07-15 | 2004-11-30 | Silverbrook Research Pty Ltd | Micro-electromechanical assembly that incorporates a covering formation for a micro-electromechanical device |
| US6834939B2 (en) | 2002-11-23 | 2004-12-28 | Silverbrook Research Pty Ltd | Micro-electromechanical device that incorporates covering formations for actuators of the device |
| US6880914B2 (en) | 1997-07-15 | 2005-04-19 | Silverbrook Research Pty Ltd | Inkjet pagewidth printer for high volume pagewidth printing |
| US6880918B2 (en) | 1997-07-15 | 2005-04-19 | Silverbrook Research Pty Ltd | Micro-electromechanical device that incorporates a motion-transmitting structure |
| US6886917B2 (en) | 1998-06-09 | 2005-05-03 | Silverbrook Research Pty Ltd | Inkjet printhead nozzle with ribbed wall actuator |
| US6886918B2 (en) | 1998-06-09 | 2005-05-03 | Silverbrook Research Pty Ltd | Ink jet printhead with moveable ejection nozzles |
| US6916082B2 (en) | 1997-07-15 | 2005-07-12 | Silverbrook Research Pty Ltd | Printing mechanism for a wide format pagewidth inkjet printer |
| US6918707B2 (en) | 1997-07-15 | 2005-07-19 | Silverbrook Research Pty Ltd | Keyboard printer print media transport assembly |
| US6927786B2 (en) | 1997-07-15 | 2005-08-09 | Silverbrook Research Pty Ltd | Ink jet nozzle with thermally operable linear expansion actuation mechanism |
| US6929352B2 (en) | 1997-07-15 | 2005-08-16 | Silverbrook Research Pty Ltd | Inkjet printhead chip for use with a pulsating pressure ink supply |
| US6932459B2 (en) | 1997-07-15 | 2005-08-23 | Silverbrook Research Pty Ltd | Ink jet printhead |
| US6935724B2 (en) | 1997-07-15 | 2005-08-30 | Silverbrook Research Pty Ltd | Ink jet nozzle having actuator with anchor positioned between nozzle chamber and actuator connection point |
| US6976751B2 (en) | 1997-07-15 | 2005-12-20 | Silverbrook Research Pty Ltd | Motion transmitting structure |
| US6986613B2 (en) | 1997-07-15 | 2006-01-17 | Silverbrook Research Pty Ltd | Keyboard |
| US7004566B2 (en) | 1997-07-15 | 2006-02-28 | Silverbrook Research Pty Ltd | Inkjet printhead chip that incorporates micro-mechanical lever mechanisms |
| US7008041B2 (en) | 1997-07-15 | 2006-03-07 | Silverbrook Research Pty Ltd | Printing mechanism having elongate modular structure |
| US7008046B2 (en) | 1997-07-15 | 2006-03-07 | Silverbrook Research Pty Ltd | Micro-electromechanical liquid ejection device |
| US7022250B2 (en) | 1997-07-15 | 2006-04-04 | Silverbrook Research Pty Ltd | Method of fabricating an ink jet printhead chip with differential expansion actuators |
| US7040738B2 (en) | 1997-07-15 | 2006-05-09 | Silverbrook Research Pty Ltd | Printhead chip that incorporates micro-mechanical translating mechanisms |
| US7044584B2 (en) | 1997-07-15 | 2006-05-16 | Silverbrook Research Pty Ltd | Wide format pagewidth inkjet printer |
| US7066574B2 (en) | 1997-07-15 | 2006-06-27 | Silverbrook Research Pty Ltd | Micro-electromechanical device having a laminated thermal bend actuator |
| US7111924B2 (en) | 1998-10-16 | 2006-09-26 | Silverbrook Research Pty Ltd | Inkjet printhead having thermal bend actuator heating element electrically isolated from nozzle chamber ink |
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1989
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