JP3099448B2 - Driving method of ink jet head - Google Patents
Driving method of ink jet headInfo
- Publication number
- JP3099448B2 JP3099448B2 JP22613091A JP22613091A JP3099448B2 JP 3099448 B2 JP3099448 B2 JP 3099448B2 JP 22613091 A JP22613091 A JP 22613091A JP 22613091 A JP22613091 A JP 22613091A JP 3099448 B2 JP3099448 B2 JP 3099448B2
- Authority
- JP
- Japan
- Prior art keywords
- ink
- nozzle
- voltage pulse
- voltage
- jet head
- 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.)
- Expired - Lifetime
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
- B41J2/015—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
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04516—Control methods or devices therefor, e.g. driver circuits, control circuits preventing formation of satellite drops
-
- 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
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04541—Specific driving circuit
-
- 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
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
-
- 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
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
Description
【０００１】[0001]
【産業上の利用分野】本発明はインクジェットヘッドの
駆動方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving an ink jet head.
【０００２】[0002]
【従来の技術】インクジェットヘッドのインク滴を噴射
する機構について図３を参照して説明する。ピエゾ素子
３に電圧を加えると変形してインク室４内の圧力が上昇
し、インクがノズル５から押し出され、インクジェット
６となって噴出する。従来、ピエゾ素子に印加する電圧
波形は、図４（ａ）に示すようなものであり、電圧がピ
ークに達した後、比較的短い時間でベース電圧までもど
る。そして、ピエゾ素子３もそれに応じて変形前の形状
にもどり、インク室内の圧力が減少して、インクの噴出
が停止すると同時に、インク供給通路７を通して図示し
ないインクタンク内のインクを吸い込む。一方、そのと
きインクジェット６はすでに勢いがついて、その慣性で
前進するので、ノズル５出口付近で切れてインク滴とな
って噴出される。2. Description of the Related Art A mechanism for ejecting ink droplets of an ink jet head will be described with reference to FIG. When a voltage is applied to the piezo element 3, the piezo element 3 is deformed and the pressure in the ink chamber 4 is increased, so that the ink is pushed out from the nozzle 5 and ejected as the ink jet 6. Conventionally, a voltage waveform applied to a piezo element is as shown in FIG. 4A, and returns to the base voltage in a relatively short time after the voltage reaches a peak. Then, the piezo element 3 also returns to its pre-deformed shape accordingly, the pressure in the ink chamber decreases, the ejection of ink stops, and at the same time, the ink in the ink tank (not shown) is sucked through the ink supply passage 7. On the other hand, at that time, the ink jet 6 has already gained momentum and moves forward by its inertia, so that the ink jet 6 is cut off near the nozzle 5 outlet and ejected as an ink droplet.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述の
電圧波形を用いた場合、ノズル５内のインクの速度は図
４（ｂ）に示すように、電圧が単調にベース電圧にもど
したとき、インク室４内やノズル内のインクの慣性でノ
ズル５内のインクの噴出が急には停止できず、インクジ
ェット６の切れが悪く、サテライトの発生原因となる。However, when the above-described voltage waveform is used, the speed of the ink in the nozzle 5 is reduced when the voltage returns to the base voltage monotonously as shown in FIG. Due to the inertia of the ink in the chamber 4 and the nozzles, the ejection of the ink in the nozzles 5 cannot be stopped suddenly, and the cutoff of the ink jet 6 is poor, which causes a satellite to be generated.
【０００４】そして、わずかな時間を経てインクの噴出
が停止し、今度は、ピエゾ素子３の急激な形状復帰によ
って、インク供給通路７からインクを吸い込むと同時
に、ノズル５内のインクに対しても大きな吸い込み力が
発生する。ノズル５内のインクはノズル出口におけるイ
ンクの表面張力でもって吸い込み力とバランスをとって
いるが、吸い込み力が強すぎるとこのバランスが崩れ
て、ノズル５内のインクが逆流して吸い込まれてしま
い、気泡の混入を招く。上記のいずれの場合も印字品質
に大きな悪影響を与える。Then, after a short time, the ejection of the ink is stopped, and this time, the ink is sucked from the ink supply passage 7 by the rapid return of the shape of the piezo element 3, and at the same time, the ink in the nozzle 5 is also discharged. Large suction force is generated. The ink in the nozzle 5 is balanced with the suction force by the surface tension of the ink at the nozzle outlet. However, if the suction force is too strong, this balance is broken and the ink in the nozzle 5 flows backward and is sucked. , Resulting in the incorporation of air bubbles. Any of the above cases has a significant adverse effect on print quality.
【０００５】本発明は、上述した問題点を解決するため
になされたものであり、インクジェットのサテライト発
生を防止すると共に、ノズル内インクの逆流も抑制する
ことができるインクジェットヘッドの駆動方法を提供す
ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a method of driving an ink-jet head capable of preventing generation of ink-jet satellites and suppressing backflow of ink in nozzles. The purpose is to:
【０００６】[0006]
【課題を解決するための手段】この目的を達成するため
に本発明のインクジェットヘッドの駆動方法は、ピエゾ
素子に駆動電圧パルスを印加することによって生ずる歪
みを利用してノズル内のインクを加圧し、インク滴をノ
ズルから噴射するオンデマンド型インクジェットヘッド
の駆動方法であって、前記ノズルからインクを噴射させ
るための噴射電圧パルスを印加するステップと、前記ノ
ズル内のインクの流れを急停止させる急停止電圧パルス
を印加するステップと、前記急停止電圧パルスを印加し
た後、インクが逆流しないように前記急停止電圧パルス
の電圧を緩やかにベース電圧にもどすステップとを備
え、前記急停止電圧パルスは、前記噴射電圧パルスに連
続し て印加される構成となっている。In order to achieve this object, a method of driving an ink jet head according to the present invention is to pressurize ink in a nozzle by utilizing distortion generated by applying a driving voltage pulse to a piezo element. A method of driving an on-demand type ink jet head for ejecting ink droplets from a nozzle, comprising: applying an ejection voltage pulse for ejecting ink from the nozzle; and suddenly stopping the flow of ink in the nozzle. applying a stop voltage pulse, after applying the sudden stop voltage pulse, and a step of returning to gently base voltage a voltage of the sudden stop voltage pulse so that the ink does not flow back, the sudden stop voltage pulse Is connected to the injection voltage pulse.
It is configured to be applied subsequently .
【０００７】[0007]
【作用】本発明のインクジェットヘッドの駆動方法にお
いては、噴射電圧パルスを印加してノズルからインクを
噴射させ、前記噴射電圧パルスに連続して急停止電圧パ
ルスをかけることによってピエゾ素子とインク室内イン
ク等の慣性を速やかに克服して、ノズル内の流れと出口
でのインクの噴出を急停止させ、サテライトの発生を防
止する。その後ピエゾ素子の変形が急速に復帰させない
ようにするため、前記急停止電圧パルスの電圧を緩やか
にベース電圧まで戻して、ノズル出口のインク表面張力
のバランスを崩さないようにして、逆流による気泡の混
入を抑制する。In the method of driving an ink jet head according to the present invention, ink is ejected from a nozzle by applying an ejection voltage pulse, and a sudden stop voltage pulse is applied successively to the ejection voltage pulse, whereby a piezo element and ink in the ink chamber are applied. And the like, to quickly overcome the inertia, to suddenly stop the flow in the nozzles and the ejection of ink at the outlet, and prevent the generation of satellites. Thereafter, in order to prevent the deformation of the piezo element from returning rapidly, the voltage of the sudden stop voltage pulse is gradually returned to the base voltage so as not to disturb the balance of the ink surface tension at the nozzle outlet, and to prevent the bubbles from being generated by the backflow. Reduce contamination.
【０００８】[0008]
【実施例】以下、本発明を具体化した一実施例を図面を
参照して説明する。尚、その説明中、インク滴を噴射す
る機構については図３に示した従来のものと同じなの
で、同じ符号を付けて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the description, the mechanism for ejecting ink droplets is the same as that of the conventional one shown in FIG.
【０００９】図１（ａ）に示す本実施例で用いる駆動電
圧波形を示す。電圧のピークから瞬時の急停止パルスを
かける（図中ｂｃ）ことによってピエゾ素子３とインク
室４内インク等の慣性を速やかに克服して、ノズル５内
の流れと出口でのインクの噴出を急停止させ、サテライ
トの発生を防止する。その後ピエゾ素子３の変形が急速
に復帰させないようにするため、電圧を元に戻して（図
中ｃｄ）から緩やかにベース電圧まで戻して（図中ｄ
ｅ）、ノズル５出口のインク表面張力のバランスを崩さ
ないようにして、逆流による気泡の混入を抑制する。FIG. 1A shows a drive voltage waveform used in this embodiment shown in FIG. By applying an instantaneous sudden stop pulse from the peak of the voltage (bc in the figure), the inertia of the piezo element 3 and the ink in the ink chamber 4 is quickly overcome, and the flow in the nozzle 5 and the ejection of the ink at the outlet are reduced. Stop suddenly to prevent satellites from being generated. Thereafter, in order to prevent the deformation of the piezo element 3 from recovering rapidly, the voltage is returned to the original voltage (cd in the figure) and then gradually returned to the base voltage (d in the figure).
e) Incorporation of air bubbles due to backflow is suppressed by maintaining the balance of the ink surface tension at the nozzle 5 outlet.
【００１０】前述の電圧波形を用いてピエゾ素子３を駆
動させた時のインクの噴出過程を説明すると、波形１の
駆動電圧がａからｂになるとき、ノズル５内インクの速
度が波形図中（ｂ）に示すようにｕからｖまで増加し、
インクがノズル５から押し出されて噴出する。そこで駆
動電圧をｂｃｄと急激に変化させると、ｖｗのようにイ
ンクの噴出は急停止するが、ノズル５内のインクが逆流
するまでは至らない。その後、駆動電圧をｄから緩やか
にベース電圧ｅに戻すと、ノズル５出口におけるインク
の表面張力の作用で、インクがノズル５内での逆流が発
生しない。The ink ejection process when the piezo element 3 is driven using the above-described voltage waveform will be described. When the drive voltage of waveform 1 changes from a to b, the speed of the ink in the nozzle 5 is reduced in the waveform diagram. Increasing from u to v as shown in (b),
The ink is pushed out from the nozzle 5 and jets. If the drive voltage is suddenly changed to bcd, the ejection of the ink is suddenly stopped as in vw, but the ink in the nozzle 5 does not flow backward. Thereafter, when the drive voltage is gradually returned from d to the base voltage e, the backflow of the ink in the nozzle 5 does not occur due to the surface tension of the ink at the nozzle 5 outlet.
【００１１】次に前述の駆動電圧を発生するための簡単
な駆動電圧波形発生回路を図２に示す。基本のこぎり形
パルス１０と反対極性ののこぎり形パルス１１を加算回
路１２に入力すると、出力として図１（ａ）に示す駆動
電圧波形１３が得られる。FIG. 2 shows a simple driving voltage waveform generating circuit for generating the above-mentioned driving voltage. When a sawtooth pulse 11 having the opposite polarity to the basic sawtooth pulse 10 is input to the adding circuit 12, a drive voltage waveform 13 shown in FIG. 1A is obtained as an output.
【００１２】以上、詳述したことから明かなように、本
実施例のインクジェットヘッドの駆動方法によれば、サ
テライトの発生およびノズル５内インクの逆流による気
泡の混入の双方を同時に抑制することができ、高品質の
印字ができる。As is clear from the above description, according to the ink jet head driving method of the present embodiment, it is possible to simultaneously suppress both the generation of satellites and the incorporation of bubbles due to the backflow of ink in the nozzles 5. And high quality printing.
【００１３】尚、本発明は以上詳述した実施例に限定さ
れるものではなく、その趣旨を逸脱しない範囲の変更は
可能である。The present invention is not limited to the embodiment described in detail above, and can be modified without departing from the scope of the invention.
【００１４】[0014]
【発明の効果】以上、詳述したことから明かなように、
本発明のインクジェットヘッドの駆動方法によれば、サ
テライトの発生およびノズル内インクの逆流による気泡
の混入の双方を同時に抑制することができ、高品質の印
字ができる。As described above, as is clear from the above description,
According to the inkjet head driving method of the present invention, it is possible to simultaneously suppress both the generation of satellites and the incorporation of bubbles due to the backflow of ink in the nozzles, and high-quality printing can be performed.
【図１】（ａ）本実施例のインクジェットヘッドを駆動
するための電圧波形を示すグラフである。 （ｂ）ノズル内のインク速度のタイミングチャートを示
すグラフである。FIG. 1A is a graph showing a voltage waveform for driving an ink-jet head of the present embodiment. 6B is a graph showing a timing chart of the ink speed in the nozzle.
【図２】駆動電圧波形発生回路の回路図である。FIG. 2 is a circuit diagram of a drive voltage waveform generation circuit.
【図３】インクジェットヘッドの断面図である。FIG. 3 is a cross-sectional view of the inkjet head.
【図４】（ａ）従来のインクジェットヘッドを駆動する
ための電圧波形を示すグラフである。 （ｂ）従来のノズル内のインク速度のタイミングチャー
トを示すグラフである。FIG. 4A is a graph showing a voltage waveform for driving a conventional inkjet head. (B) A graph showing a timing chart of the ink speed in a conventional nozzle.
３ ピエゾ素子 １３ 駆動電圧波形 3 Piezo element 13 Drive voltage waveform
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B41J 2/045 B41J 2/055 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. 7 , DB name) B41J 2/045 B41J 2/055
Claims (1)
ことによって生ずる歪みを利用してノズル内のインクを
加圧し、インク滴をノズルから噴射するオンデマンド型
インクジェットヘッドの駆動方法であって、 前記ノズルからインクを噴射させるための噴射電圧パル
スを印加するステップと、 前記ノズル内のインクの流れを急停止させる急停止電圧
パルスを印加するステップと、 前記急停止電圧パルスを印加した後、インクが逆流しな
いように前記急停止電圧パルスの電圧を緩やかにベース
電圧にもどすステップとを備え、 前記急停止電圧パルスは、前記噴射電圧パルスに連続し
て印加される ことを特徴とするインクジェットヘッドの
駆動方法。1. A method of driving an on-demand type ink jet head which pressurizes ink in a nozzle by utilizing a distortion generated by applying a driving voltage pulse to a piezo element and ejects an ink droplet from the nozzle, Applying an ejection voltage pulse for ejecting ink from the nozzle; applying a sudden stop voltage pulse for suddenly stopping the flow of ink in the nozzle; and applying the sudden stop voltage pulse. Gently returning the voltage of the sudden stop voltage pulse to the base voltage so as not to cause backflow , the sudden stop voltage pulse being continuous with the ejection voltage pulse.
A method for driving an ink-jet head, wherein
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22613091A JP3099448B2 (en) | 1991-09-05 | 1991-09-05 | Driving method of ink jet head |
| EP92308088A EP0531173A1 (en) | 1991-09-05 | 1992-09-07 | Method of driving an ink jet printer head and driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22613091A JP3099448B2 (en) | 1991-09-05 | 1991-09-05 | Driving method of ink jet head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0557888A JPH0557888A (en) | 1993-03-09 |
| JP3099448B2 true JP3099448B2 (en) | 2000-10-16 |
Family
ID=16840320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22613091A Expired - Lifetime JP3099448B2 (en) | 1991-09-05 | 1991-09-05 | Driving method of ink jet head |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0531173A1 (en) |
| JP (1) | JP3099448B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08139344A (en) * | 1994-11-14 | 1996-05-31 | Nec Corp | Optical semiconductor device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711256B1 (en) * | 1993-10-12 | 1995-11-24 | Matra Communication | Method and device for controlling an electronic member, in particular a piezoelectric inkjet print head. |
| US6217159B1 (en) | 1995-04-21 | 2001-04-17 | Seiko Epson Corporation | Ink jet printing device |
| JPH0952360A (en) * | 1995-04-21 | 1997-02-25 | Seiko Epson Corp | Ink jet recording apparatus |
| JP2008168531A (en) | 2007-01-12 | 2008-07-24 | Canon Inc | Liquid delivering method and liquid delivering apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3902083A (en) * | 1972-06-05 | 1975-08-26 | Gould Inc | Pulsed droplet ejecting system |
| JPS5615365A (en) * | 1979-07-18 | 1981-02-14 | Fujitsu Ltd | Driving method for ink jet recorder |
| JPS58168572A (en) * | 1982-03-31 | 1983-10-04 | Fujitsu Ltd | Liquid droplet spouting method |
-
1991
- 1991-09-05 JP JP22613091A patent/JP3099448B2/en not_active Expired - Lifetime
-
1992
- 1992-09-07 EP EP92308088A patent/EP0531173A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08139344A (en) * | 1994-11-14 | 1996-05-31 | Nec Corp | Optical semiconductor device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0557888A (en) | 1993-03-09 |
| EP0531173A1 (en) | 1993-03-10 |
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