JPS5914970A - Inkjet recorder - Google Patents
Inkjet recorderInfo
- Publication number
- JPS5914970A JPS5914970A JP12484882A JP12484882A JPS5914970A JP S5914970 A JPS5914970 A JP S5914970A JP 12484882 A JP12484882 A JP 12484882A JP 12484882 A JP12484882 A JP 12484882A JP S5914970 A JPS5914970 A JP S5914970A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- deflection
- inkjet recording
- electric field
- ink droplets
- 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
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
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/09—Deflection means
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明１ｄ、荷電制御型インクジェット記録装置の改良
に係り、特に、偏向電極を少なくとも３つの偏向電極板
で構成するとともに、各電極板に印加する電圧を異なら
しめて偏向電界を一定にして偏向感度を大きクシ、もっ
て、印写束を低減して印写画像の高品質化を図ったもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention 1d relates to an improvement of a charge control type inkjet recording device, in particular, the deflection electrode is composed of at least three deflection electrode plates, and the voltage applied to each electrode plate is varied to increase the deflection electric field. By keeping the angle constant and increasing the deflection sensitivity, the printing flux is reduced and the quality of the printed image is improved.
第１図は、荷電制御型インクジェット記録装置の一例を
説明するための図で、図中、１はインク滴を形成するた
めのインクジェットヘッド、２はインク滴、３は４ンク
滴２を荷電するための荷電電極、４は荷電信号発生回路
、５ａは上側偏向電極、５ｂは下側偏向電極、６はプラ
テン、７は記録紙、８はガター、９はインク回収ポンプ
、１０はインクタンク、１１はインク加圧ポンプで、周
知のように、インク加圧ポンプ］］で加圧されたインク
はインクジェットヘッド１よりインク滴２として噴射さ
れ、該インク滴２は荷電電極３において荷電信号発生回
路４からの荷電信号に応じて荷電され、偏向電極５ａ、
５ｂ間においてその荷電量に応じて偏向されて記録紙７
に印写され、一方、荷電されなかった非印写部は直進し
てガター８によって捕獲、回収されて再使用に供される
。而して、上述のごとき荷電制御型インクジェット記録
装置においては、同一時刻に多数個のインク滴が偏向電
界内に存在し、インク滴同志の相互干渉が印写画像に影
響する。この相互干渉を小さくするために、例えば、偏
向電界を大きくして荷電量を小さくシ、或いは、インク
ジェットヘッドと記録紙との距離を短くすること等が考
えられるが、偏向電界を大きくするために偏向電圧を高
くすると、空中放電が発生して信頼性が低下してし甘う
。また、従来の荷電制御型インクジェット記録装置は、
図示のように、偏向電極は一対の偏向電極板で構成され
、電極電位は同一電位となっており、Ａ部ではインク滴
の偏向距離（インク滴噴射軸からの偏向距離）が小さい
ため電界強度を強くすることができるが（前記空中放電
に対する電界強度はここで決定される）、Ｂ部に入ると
電界が弱くなり、偏向効率が悪くなる等の欠点があった
。FIG. 1 is a diagram for explaining an example of a charge control type inkjet recording device. In the figure, 1 is an inkjet head for forming ink droplets, 2 is an ink droplet, and 3 is a 4-ink droplet 2 for charging. 4 is a charging signal generation circuit, 5a is an upper deflection electrode, 5b is a lower deflection electrode, 6 is a platen, 7 is a recording paper, 8 is a gutter, 9 is an ink collection pump, 10 is an ink tank, 11 is an ink pressurizing pump, and as is well known, the ink pressurized by the ink pressurizing pump is ejected from the inkjet head 1 as ink droplets 2, and the ink droplets 2 are sent to the charging electrode 3 and to the charging signal generating circuit 4. The deflection electrode 5a is charged according to a charge signal from the deflection electrode 5a,
5b, the recording paper 7 is deflected according to the amount of charge.
On the other hand, the uncharged non-imprinted portions go straight and are captured and recovered by the gutter 8 for reuse. In the charge control type inkjet recording apparatus as described above, a large number of ink droplets exist within the deflection electric field at the same time, and mutual interference between the ink droplets affects the printed image. In order to reduce this mutual interference, for example, it is possible to increase the deflection electric field to reduce the amount of charge, or to shorten the distance between the inkjet head and the recording paper. If the deflection voltage is increased, air discharge will occur and reliability will be reduced. In addition, conventional charge-controlled inkjet recording devices
As shown in the figure, the deflection electrode is composed of a pair of deflection electrode plates, and the electrode potentials are the same. In part A, the deflection distance of the ink droplet (deflection distance from the ink droplet ejection axis) is small, so the electric field strength is (the electric field strength for the above-mentioned air discharge is determined here), but when it enters the B section, the electric field becomes weaker, resulting in a disadvantage that the deflection efficiency deteriorates.
本発明は、上述のごとき従来技術の欠点を解決するため
になされたもので、特に、前記偏向電極を少なくとも３
つの偏向電極板で構成し、偏向電界を一定にして偏向感
度を上昇させ、もって、印写型を低減し、画像品質の向
上を図ったものである０
第２図は、本発明によるインクジェット記録装置の一実
施例を説明するための要部構成図で、図中、５ａ１．５
ａ２は上部偏向電極、５ｂは下部偏向電極で、図示のよ
うに、上部偏向電極は第１電極５ａ１と第３２電極５ａ
２に２分割され、また、下部偏向電極５ｂは接地されて
いる。今、上部第１電極５ａ１と下部偏向電極５ｂの間
隔をａ１該上部第１電極５ａ１に印加される電圧をＶｄ
１とすれば、該上部第１電極５ａ１と下部偏向電極５ｂ
間の電界強度止、はＶｄ１／ａとなり、上部第２電極５
ａ２と下部偏向電極５ｂの間隔をｂ１該上部第２電極５
ａ２に印加される電圧をＶｄ２とすれば、該上部第２電
極５ａ２と下部偏向電極５ｂ間の電界強度Ｌ２はＶｄ２
／ｂとなり、更に、上部第１電極５ａ１と第２電極５ａ
２の間隔をＣとすれば、これら第１電極５ａ１と第２電
極５ａ２との間の電界強度慢、はＶｄ２−Ｖｄ１となる
。ナオ、上記電圧ｖｄ１、■ｄ２Ｃ工
は、図下例の場合、偏向電源Ｖｄを保護抵抗Ｒ８を含む
直列抵抗ＲＯ％ Ｒ１、Ｒ２で分割し、より得ている。The present invention has been made to solve the above-mentioned drawbacks of the prior art, and in particular, the deflection electrode is
The inkjet recording device is composed of two deflection electrode plates, which increases the deflection sensitivity by keeping the deflection electric field constant, thereby reducing the number of printing types and improving the image quality. This is a main part configuration diagram for explaining one embodiment of the device, and in the figure, 5a1.5
a2 is an upper deflection electrode, 5b is a lower deflection electrode, and as shown in the figure, the upper deflection electrode is a first electrode 5a1 and a 32nd electrode 5a.
The lower deflection electrode 5b is grounded. Now, the distance between the upper first electrode 5a1 and the lower deflection electrode 5b is a1, and the voltage applied to the upper first electrode 5a1 is Vd.
1, the upper first electrode 5a1 and the lower deflection electrode 5b
The electric field strength between is Vd1/a, and the upper second electrode 5
The distance between a2 and the lower deflection electrode 5b is b1.
If the voltage applied to a2 is Vd2, the electric field strength L2 between the upper second electrode 5a2 and the lower deflection electrode 5b is Vd2.
/b, and furthermore, the upper first electrode 5a1 and the second electrode 5a
If the interval between the two electrodes is C, then the electric field strength between the first electrode five a1 and the second electrode five a2 is Vd2-Vd1. In the case of the lower example in the figure, the voltages vd1 and d2C are obtained by dividing the deflection power supply Vd by series resistors R1 and R2 including the protection resistor R8.
なお、第３図には、Ｖｄ１＝−３，５に、Ｖ。In addition, in FIG. 3, Vd1=-3.5 and V.
Ｖｄ２＝−４，７ＫＶ、ａ：２ｍｍＸｂ＝２．８ｍ、ｃ
＝１．２ｍｍとした場合の等電位面の概略を示すが、図
中、１２はインクミスト吸収板である。Vd2=-4.7KV, a: 2mmXb=2.8m, c
The outline of the equipotential surface in the case where = 1.2 mm is shown, and in the figure, 12 is an ink mist absorbing plate.
第４図の曲線Ａはその時の放電カーブ、曲＃Ｂはインク
滴がある場合の放電カーブ、直線Ｃは電界はＱとなり、
放電カーブより２．５ ＫＶ近く低いが、従来のインク
ジェット記録装置においては、Ｒ２がＲとなって偏向感
度が低くなってしまうＯ第４図は、本発明の他の実施例
を示す要部概略構成図で、この実施例は、上下両偏向電
極を２分割し、上部第２電極板５ａ２と下部第２電極板
５ｂｚの間隔をより広くとれるようにしたもので、この
ようにすると、荷電されたインク滴の後続滴が荷電量に
よりザ荷電された場合に、この逆荷重されたインク滴２
′ が下部偏向電極に衝突するのを防止することができ
る。なお、第２図及び第４図に示した実施例とも電極間
は空隙になっており、その間隔は空気中の放電破壊電圧
によって決定されるが、これは、電極間に絶縁体等を挿
入すると、表面のぬれによる沿面放電が起こるためであ
り、また、インクミスト等による信頼性低下を防止する
ためである。Curve A in Figure 4 is the discharge curve at that time, track #B is the discharge curve when there are ink droplets, straight line C is the electric field Q,
Although it is nearly 2.5 KV lower than the discharge curve, in a conventional inkjet recording device, R2 becomes R and the deflection sensitivity becomes low. In the configuration diagram, in this embodiment, both the upper and lower deflection electrodes are divided into two, so that the distance between the upper second electrode plate 5a2 and the lower second electrode plate 5bz can be made wider. When the subsequent ink droplet is charged by the amount of charge, this reversely loaded ink droplet 2
′ can be prevented from colliding with the lower deflection electrode. Note that in both the embodiments shown in Figures 2 and 4, there is a gap between the electrodes, and the gap is determined by the discharge breakdown voltage in the air. This is because creeping discharge occurs due to wetting of the surface, and also to prevent a decrease in reliability due to ink mist or the like.
第６図は、上記本発明によるインクジェット記録装置を
カラープリンタに適用した場合の一例を示す概略平面図
、第７図は側面図で、図中、Ｂはブラック噴射用のイン
クジェットヘッド、Ｃはシアン噴射用のインクジェット
ヘッド、Ｍはマゼンタ噴射用のインクジェットヘッド、
Ｙはイエロー噴射用のインクジェットヘッドで、図示の
ように、複数個のインクジェットヘッドを使用する所謂
マルチノズルインクジェット記録装置に本発明を適用す
る場合には、前記本発明による電極構造を共通使用する
ことができる。FIG. 6 is a schematic plan view showing an example of the case where the inkjet recording device according to the present invention is applied to a color printer, and FIG. 7 is a side view. In the figure, B is an inkjet head for jetting black, and C is a cyan inkjet head. Inkjet head for jetting, M is inkjet head for magenta jetting,
Y is an inkjet head for ejecting yellow, and as shown in the figure, when the present invention is applied to a so-called multi-nozzle inkjet recording device that uses a plurality of inkjet heads, the electrode structure according to the present invention can be commonly used. Can be done.
なお、以上に本発明の各実施例について説明したが、実
際のインクジェット記録装置においては、最大の偏向距
離は５ ｍｍ以上であり、偏向電極の幅を７ ｍｍ程度
にすれば、インク滴が偏向電極に衝突するのを防止する
ことができるが、第５図に示したように、電界強度を太
きくとれる範囲は２〜４朋が最もよく、これを実現する
ために、インクジェットヘッドに近い方の電極の幅を２
′Ｍ＋Ｉ＋程度、遠い方の電極の幅を３〜４朋程度にし
、かつ、前述のようにして電界強度を一定にするように
すれば、最も偏向感度のよいインクジェット記録装置を
得ることができる。Although each embodiment of the present invention has been described above, in an actual inkjet recording device, the maximum deflection distance is 5 mm or more, and if the width of the deflection electrode is set to about 7 mm, the ink droplet can be deflected. Collision with the electrode can be prevented, but as shown in Figure 5, the best range for increasing the electric field strength is between 2 and 4. The width of the electrode is 2
If the width of the electrode on the far side is set to about 3 to 4 mm, and the electric field strength is kept constant as described above, an inkjet recording device with the highest deflection sensitivity can be obtained.
以上の説、明から明らか々ように、本発明によると、簡
単な構成によって偏向電界を一定にして偏向感度を大き
くすることができ、それによって、印写型を低減して画
像品質の向上を図るととができる。As is clear from the above explanation, according to the present invention, the deflection electric field can be kept constant and the deflection sensitivity can be increased with a simple configuration, thereby reducing the number of printing molds and improving image quality. If you aim, you will be able to do it.
第１図は、従来のインクジェット記録装置の一例を説明
するだめの概略構成図、第２図は、本発明によるインク
ジェット記録装置の一実施例を詐明するための要部構成
図、第３図は、本発明によるインクジェット記録装置に
おける偏向電界の概略分布図、第４図は、本発明の他の
実施例を説明するだめの要部構成図、第５図は、本発明
の動作原理を説明するだめの放電特性図、第６図は、本
発明をカラープリンタに適用した場合の一例を示す要部
概略平面図、第７図は、側面図である。
１ ・インクジェットヘッド、２ ・インク滴、３・・
荀電電極、５ａ、５ａ１．５ ａ２．５ Ｊ ５ ｂｌ
、５ ｂ２偏向電極。FIG. 1 is a schematic configuration diagram for explaining an example of a conventional inkjet recording device, FIG. 2 is a configuration diagram of essential parts to explain an embodiment of an inkjet recording device according to the present invention, and FIG. 3 1 is a schematic distribution diagram of a deflection electric field in an inkjet recording apparatus according to the present invention, FIG. 4 is a diagram illustrating the main part of another embodiment of the present invention, and FIG. 5 is a diagram illustrating the operating principle of the present invention. FIG. 6 is a schematic plan view of a main part showing an example of the application of the present invention to a color printer, and FIG. 7 is a side view. 1 ・Inkjet head, 2 ・Ink droplet, 3...
Xunden electrode, 5a, 5a1.5 a2.5 J 5 bl
, 5 b2 deflection electrode.
Claims (5)
ドと、前記インク滴に荷電するための荷電電極と、前記
インク滴を偏向するだめの偏向電極とを有するインクジ
ェット記録装置において、前記偏向電極を少なくとも３
つの偏向電極板で構成し、各電極板に印加する電圧を異
ならしめたことを特徴とするインクジェット記録装置。(1) In an inkjet recording apparatus having an inkjet head for forming ink droplets, a charging electrode for charging the ink droplets, and a deflection electrode for deflecting the ink droplets, the deflection electrode is at least 3
1. An inkjet recording device comprising two deflection electrode plates, and different voltages are applied to each electrode plate.
る特許請求の範囲第（１）項に記載のインクジェット記
録装置。(2) The inkjet recording apparatus according to claim (1), characterized in that a gap is provided between each of the electrode plates.
を略一定にするように前記電極板間の間隔及び各電極板
に印加する電圧を設定したことを特徴とする特許請求の
範囲第（１）項又は第（２）項に記載のインクジェット
記録装置。(3) The spacing between the electrode plates and the voltage applied to each electrode plate are set so that the deflection electric field perpendicular to the ejection axis of the ink droplet is substantially constant. The inkjet recording device according to item (1) or item (2).
、遠い電極板の幅を広くしたことを特徴とする特Ｗ−ｆ
請求の範囲第（１）項又は第（２）項又は第（３）項に
記載のインクジェット記録装置。(4) Special W-f characterized by narrowing the width of the electrode plate close to the inkjet head and widening the width of the electrode plate far from the inkjet head.
An inkjet recording apparatus according to claim (1), (2), or (3).
ヘッド部を複数個有し、各インクジェットヘッド部から
のインク滴に対して前記偏向電極を共通に使用するよう
にしたことを特徴とする特許請求の範囲第（１）項乃至
第（４）項のいずれか１項に記載゛のインクジェット記
録装置。(5) A patent claim characterized in that the invention has a plurality of inkjet head sections for forming the ink droplets, and the deflection electrode is commonly used for the ink droplets from each inkjet head section. The inkjet recording apparatus according to any one of the ranges (1) to (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12484882A JPS5914970A (en) | 1982-07-16 | 1982-07-16 | Inkjet recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12484882A JPS5914970A (en) | 1982-07-16 | 1982-07-16 | Inkjet recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5914970A true JPS5914970A (en) | 1984-01-25 |
Family
ID=14895588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12484882A Pending JPS5914970A (en) | 1982-07-16 | 1982-07-16 | Inkjet recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5914970A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181498A (en) * | 1990-11-21 | 1993-01-26 | Mitsubishi Denki Kabushiki Kaisha | Ignition apparatus for an internal combustion engine |
| WO2008040777A1 (en) * | 2006-10-05 | 2008-04-10 | Imaje S.A. | Printing by deflecting an ink jet through a variable field |
| US8104879B2 (en) | 2005-10-13 | 2012-01-31 | Imaje S.A. | Printing by differential ink jet deflection |
-
1982
- 1982-07-16 JP JP12484882A patent/JPS5914970A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5181498A (en) * | 1990-11-21 | 1993-01-26 | Mitsubishi Denki Kabushiki Kaisha | Ignition apparatus for an internal combustion engine |
| US8104879B2 (en) | 2005-10-13 | 2012-01-31 | Imaje S.A. | Printing by differential ink jet deflection |
| WO2008040777A1 (en) * | 2006-10-05 | 2008-04-10 | Imaje S.A. | Printing by deflecting an ink jet through a variable field |
| FR2906755A1 (en) * | 2006-10-05 | 2008-04-11 | Imaje Sa Sa | Liquid jet e.g. ink jet, deflecting method for use during ink-jet printing, involves generating variable electric field along hydraulic path, and deflecting liquid jet by field by mobilization of charges within jet |
| US8162450B2 (en) | 2006-10-05 | 2012-04-24 | Markem-Imaje | Printing by deflecting an ink jet through a variable field |
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