JPH0267143A - Electrostatic induction type ink jet recording apparatus - Google Patents
Electrostatic induction type ink jet recording apparatusInfo
- Publication number
- JPH0267143A JPH0267143A JP21944388A JP21944388A JPH0267143A JP H0267143 A JPH0267143 A JP H0267143A JP 21944388 A JP21944388 A JP 21944388A JP 21944388 A JP21944388 A JP 21944388A JP H0267143 A JPH0267143 A JP H0267143A
- Authority
- JP
- Japan
- Prior art keywords
- jet
- head
- ink
- end parts
- recording
- 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
- 230000006698 induction Effects 0.000 title abstract 2
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 230000005684 electric field Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000005499 meniscus Effects 0.000 description 3
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000007641 inkjet printing Methods 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
-
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
- B41J2002/061—Ejection by electric field of ink or of toner particles contained in ink
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【発明の詳細な説明】
技監分立
本発明は、静電誘引型インクジェット記録装置、より詳
細には、静電誘引型インクジェット記録装置のヘッド部
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic attraction type inkjet recording device, and more particularly to a head portion of an electrostatic attraction type inkjet recording device.
良末１４
第３図は、従来のインクジェット記録装置の要部構成図
で、図中、１は複数個の記録電極２が配設されたインク
供給口３を有するヘッド液室、４は記録の幅方向に複数
個の噴射口５が一体的に形成されたノズルプレート、６
は前記インク噴射口５に対向して配設された対向電極、
７は該対向電極６に沿って移動する記録紙、８は前記記
録電極２の選択された電極に電圧（Ｖｐ）を印加する記
録用電源、９はパルス電圧源（ＶＡ）で、このパルス電
圧源９は他の信号にかかわらず一定周波数によって駆動
され、前記ヘッド液室１の体積を変化させる体積変動機
描１０を動作させ、ヘッド内のインクに周期的に圧力パ
ルスを発生させる。１１は前記対向電極６に電圧（ｖＢ
）を印加するバイアス用電源である。上記静電型インク
ジェット記録装置においては、バイアス電圧（ｖＢ）が
印加されることにより、画電極２，６間に静電界が形成
され、インク液にパイアスカＦ工が加わり、前記インク
噴射口５に突状のメニスカスが一様に形成されるにの状
態は、Ｆ、＝ｑＥで示される（ただし、ｑは電荷密度、
Ｅは電界強度）。さらに、前記記録電極２に電圧Ｖｐを
印加するとＦ２という力でメニスカスが更に曳糸的に引
き出される。引き出されたインク滴は、対向電極６との
間の距離が短かくなるため、電界強度Ｅがさらに強くな
って飛翔し、連続的に噴射が行なわれる。すなわち、Ｆ
ｚ＝（ｑ＋Δｑ）（Ｅ＋ΔＥ）で示される（ただし、Δ
ｑは記録電圧Ｖｐの印加による電荷密度、ΔＥは記録電
圧■Ｐの印加による電界強度）。なお、インクの噴射は
、記録電圧Ｖｐのオフによりイオンの注入が停止するこ
とで若干の遅延後停止する６
上述のごとき静電誘引型インクジェット記録装置におい
ては、オリフィスの大きさよりも小さな画素径が得られ
、かつ画素径は記録電圧Ｖｐのパルス巾によって可変で
ある等、径変調が可能で、かつ目詰りが少ない等のメリ
ットが有するが、実際に噴射が行なわれた場合、次の様
な問題が生じる。すなわち、第４図（ａ）に、従来の静
電誘弓型インクジェット記録装置のインクジェットヘッ
ドにおけるインク滴の噴射方向がＡにて示され、第４図
（ｂ）に、同ヘッドにおける電気力線がＢにて示されて
いるが、このように、ヘッドの長さ方向に複数個の噴射
口５が配設された場合、第４図（ａ）に示す如く、左又
は右端の噴射口５ａから噴出された噴射部が曲がって飛
翔する現象が生じる。これば、第４図（ｂ）に示す如く
、記録電極２と対向電極６との間に生じる電気力線が左
又は右端の電極２ａに集中し、メニスカス及び噴射部が
左又は右に曲がった方向性を生じるためである。Figure 3 is a diagram showing the main parts of a conventional inkjet recording device. In the figure, 1 is a head liquid chamber having an ink supply port 3 in which a plurality of recording electrodes 2 are arranged, and 4 is a recording head liquid chamber. A nozzle plate 6 in which a plurality of injection ports 5 are integrally formed in the width direction.
is a counter electrode disposed opposite the ink jet port 5;
7 is a recording paper that moves along the counter electrode 6; 8 is a recording power source that applies a voltage (Vp) to a selected electrode of the recording electrode 2; 9 is a pulse voltage source (VA); The source 9 is driven at a constant frequency, regardless of other signals, and operates a volume changer 10 which changes the volume of the head liquid chamber 1 and periodically generates pressure pulses in the ink within the head. 11 is a voltage (vB) applied to the counter electrode 6.
) is a bias power supply that applies In the electrostatic inkjet recording device described above, by applying a bias voltage (vB), an electrostatic field is formed between the image electrodes 2 and 6, and the ink liquid is subjected to a pie sca F process, which causes the ink jet port 5 to The condition in which a protruding meniscus is uniformly formed is expressed as F, = qE (where q is the charge density,
E is the electric field strength). Further, when a voltage Vp is applied to the recording electrode 2, the meniscus is further pulled out in a string-like manner by a force F2. Since the distance between the drawn out ink droplets and the counter electrode 6 is shortened, the electric field strength E becomes even stronger and the ink droplets fly and are continuously ejected. That is, F
It is shown as z=(q+Δq)(E+ΔE) (however, Δ
q is the charge density due to the application of the recording voltage Vp, and ΔE is the electric field intensity due to the application of the recording voltage ■P). Note that the ink jetting stops after a slight delay when the recording voltage Vp is turned off and the ion injection stops.6 In the electrostatic attraction type inkjet recording device as described above, the pixel diameter is smaller than the orifice size. The pixel diameter is variable depending on the pulse width of the recording voltage Vp, and has advantages such as diameter modulation and less clogging. However, when actually ejecting, the following A problem arises. That is, in FIG. 4(a), the ejection direction of ink droplets in the inkjet head of a conventional electrostatic bow type inkjet recording device is shown by A, and in FIG. 4(b), the lines of electric force in the same head are shown. is shown in B, but when a plurality of injection ports 5 are arranged in the length direction of the head in this way, as shown in FIG. 4(a), the injection ports 5a at the left or right end A phenomenon occurs in which the jet ejected from the jet bends and flies. In this case, as shown in FIG. 4(b), the lines of electric force generated between the recording electrode 2 and the counter electrode 6 are concentrated on the left or right end electrode 2a, and the meniscus and the injection part are bent to the left or right. This is to create directionality.
且−一」翌
本発明は、上述のごとき実情に鑑みてなされたもので、
特に、複数の噴射口を有する静電誘引型インクジェット
記録装置において、ヘッドの長さ方向の両端部の噴射方
向精度を向上させることを目的としてなされたものであ
る。[1] The present invention was made in view of the above-mentioned circumstances,
Particularly, in an electrostatic attraction type inkjet recording device having a plurality of ejection ports, the purpose is to improve the ejection direction accuracy at both longitudinal ends of the head.
捧−一玖
本発明は、上記目的を達成するために、液体インクに静
電力を作用させ、インクを噴射口から噴射して記録紙に
付着させる複数の噴射口を有する静電誘引型インクジェ
ット記録装置において、噴射口に対応して記録電極を有
し、前記複数の噴射口の長さ方向の両端部に、換言すれ
ば、ヘッドの幅方向の端部噴射口の更に外側に、ダミー
電極を有すること、或いは、対向電極と記録電極との間
の電界強度を等しくするように両電極間の距離を設定し
たことを特徴としたものである。以下５本発明の実施例
に基づいて説明する。In order to achieve the above-mentioned object, the present invention provides an electrostatic attraction type inkjet recording having a plurality of nozzles for applying an electrostatic force to liquid ink and ejecting the ink from the nozzles to adhere it to recording paper. The device has recording electrodes corresponding to the injection ports, and dummy electrodes are provided at both longitudinal ends of the plurality of injection ports, in other words, at the ends of the head in the width direction further outside the injection ports. Alternatively, the distance between the opposing electrode and the recording electrode is set so as to equalize the electric field strength between the two electrodes. The following will explain based on five embodiments of the present invention.
第１図（ａ）、（ｂ）は、本発明による静電誘引型イン
クジェット記録装置の一実施例を説明するための要部概
略図で、図中、第４図の場合と同様の作用をする箇所に
は第４図の場合と同一の参照番号が付されている。而し
て、（ａ）図は、インクジェットヘッドにおけるインク
滴の噴射方向をＡにて、（ｂ）図は、同ヘッドにおける
電気力線をＢにて示している。２ｂはヘッドの長さ（幅
）方向の両端部に配設されたダミー電極で、本実施例で
は、ダミー電極２ｂに、端部に集中する電気力線を集め
、両端部以外では等電気力線が形成されるようにして、
もって、インク液滴の噴射方向の直進性を確保している
。FIGS. 1(a) and 1(b) are schematic diagrams of main parts for explaining an embodiment of an electrostatic attraction type inkjet recording apparatus according to the present invention. The same reference numerals as in FIG. 4 are given to the same parts. In figure (a), A indicates the ejection direction of ink droplets in the inkjet head, and in figure (b), line of electric force in the head is indicated by B. 2b is a dummy electrode arranged at both ends in the length (width) direction of the head. In this embodiment, the dummy electrode 2b collects lines of electric force concentrated at the ends, and the lines of electric force concentrated at the ends are equal to each other. so that a line is formed,
This ensures the straightness of the ink droplets in the jetting direction.
第２図は、本発明による静電誘引型インクジェット記録
装置の他の実施例を説明するための要部概略図で、この
実施例では、記録電極２と対向電極６との距離に両端部
で相対的に差を設け、電界強度を一定に保持している。FIG. 2 is a schematic diagram of main parts for explaining another embodiment of the electrostatic attraction type inkjet recording device according to the present invention. In this embodiment, the distance between the recording electrode 2 and the counter electrode 6 is A relative difference is provided to keep the electric field strength constant.
すなわち、箭記紀録電極２の両端部の記録電極２ａに対
応する対向電極６の両端部を所定の角度θの傾斜面に形
成し、画電極２，６間の電界強度を等しくするように、
画電極２，６間の距離を設定したものである。That is, both ends of the counter electrode 6 corresponding to the recording electrodes 2a at both ends of the recording electrode 2 are formed into inclined surfaces at a predetermined angle θ, so that the electric field strength between the picture electrodes 2 and 6 is equalized.
The distance between the picture electrodes 2 and 6 is set.
夏−一果
以上の説明から明らかなように、本発明によると、イン
クジェットヘッドの長さ（＠）方向の両端部の噴射方向
精度を向上させることができる。As is clear from the above description, according to the present invention, the accuracy of the ejection direction at both ends of the inkjet head in the length (@) direction can be improved.
第１図及び第２図は、それぞれ本発明による静電誘引型
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
部概略図、第３図は、従来の静電誘引型インクジェット
記録装置の要部構成図、第４図（ａ）、（ｂ）は、それ
ぞれ従来の静電誇り型インクジェット記録装置のインク
ジェットヘッドにおけるインク滴の噴射方向および同ヘ
ッドにおける電気力線の状態を説明するための図である
。
１・・・ヘッド液室、２・・・記録電極、２ａ・・・端
部電極。
２ｂ・・・ダミー電極、５・・・噴射口、６ａ・・・端
部噴射口、６・・・対向電極。
特許出願人 株式会社 リコー
ＩＱ）
（ｂン1 and 2 are schematic diagrams of main parts for explaining an embodiment of an electrostatic attraction type inkjet recording device according to the present invention, and FIG. 3 is a main part of a conventional electrostatic attraction type inkjet recording device. The partial configuration diagram and FIGS. 4(a) and 4(b) are diagrams for explaining the ejection direction of ink droplets in an inkjet head of a conventional electrostatic inkjet recording apparatus and the state of electric lines of force in the head, respectively. It is. DESCRIPTION OF SYMBOLS 1... Head liquid chamber, 2... Recording electrode, 2a... End electrode. 2b...Dummy electrode, 5...Injection port, 6a...End injection port, 6...Counter electrode. Patent applicant: Ricoh IQ Co., Ltd.)
Claims (1)
ら噴射して記録紙に付着させる複数の噴射口を有する静
電誘引型インクジェット記録装置において、噴射口に対
応して記録電極を有し、前記複数の噴射口の長さ方向の
両端部にダミー電極を有することを特徴とする静電誘引
型インクジェット記録装置。 ２、液体インクに静電力を作用させ、インクを噴射口か
ら噴射して記録紙に付着させる複数の噴射口を有する静
電誘引型インクジェット記録装置において、対向電極と
記録電極との間の電界強度を等しくするように前記対向
電極間の距離を設定したことを特徴とする静電誘引型イ
ンクジェット記録装置。[Scope of Claims] 1. In an electrostatic attraction type inkjet recording device having a plurality of ejection ports that apply electrostatic force to liquid ink and eject the ink from the ejection ports to adhere to recording paper, 1. An electrostatic attraction type inkjet recording device, comprising: a recording electrode; and a dummy electrode at both lengthwise ends of the plurality of ejection ports. 2. Electric field strength between the counter electrode and the recording electrode in an electrostatic attraction type inkjet recording device having a plurality of nozzles that apply electrostatic force to liquid ink and eject the ink from the nozzles to adhere to the recording paper. An electrostatic attraction type inkjet recording device, characterized in that the distance between the opposing electrodes is set so that the distance between the opposite electrodes is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21944388A JPH0267143A (en) | 1988-08-31 | 1988-08-31 | Electrostatic induction type ink jet recording apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21944388A JPH0267143A (en) | 1988-08-31 | 1988-08-31 | Electrostatic induction type ink jet recording apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0267143A true JPH0267143A (en) | 1990-03-07 |
Family
ID=16735492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21944388A Pending JPH0267143A (en) | 1988-08-31 | 1988-08-31 | Electrostatic induction type ink jet recording apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0267143A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997015447A1 (en) * | 1995-10-23 | 1997-05-01 | Imaging Technology International Corporation | Shadow pulse compensation of an ink jet printer |
| US5877790A (en) * | 1995-12-14 | 1999-03-02 | Nec Corporation | Electrostatic ink jet recording apparatus ejecting ink using different electric potentials applied to different electrodes |
-
1988
- 1988-08-31 JP JP21944388A patent/JPH0267143A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997015447A1 (en) * | 1995-10-23 | 1997-05-01 | Imaging Technology International Corporation | Shadow pulse compensation of an ink jet printer |
| US5923346A (en) * | 1995-10-23 | 1999-07-13 | Imaging Technology International | Shadow pulse compensation of an ink jet printer |
| US5877790A (en) * | 1995-12-14 | 1999-03-02 | Nec Corporation | Electrostatic ink jet recording apparatus ejecting ink using different electric potentials applied to different electrodes |
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