JPH05318766A - Method for driving ink jet head - Google Patents

Method for driving ink jet head

Info

Publication number
JPH05318766A
JPH05318766A JP15161892A JP15161892A JPH05318766A JP H05318766 A JPH05318766 A JP H05318766A JP 15161892 A JP15161892 A JP 15161892A JP 15161892 A JP15161892 A JP 15161892A JP H05318766 A JPH05318766 A JP H05318766A
Authority
JP
Japan
Prior art keywords
flow path
pulse
ink
driving
piezoelectric
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.)
Granted
Application number
JP15161892A
Other languages
Japanese (ja)
Other versions
JP3197338B2 (en
Inventor
Masanori Hirano
Taeko Murai
Tomoaki Nakano
智昭 中野
政徳 平野
妙子 村井
Original Assignee
Ricoh Co Ltd
株式会社リコー
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Priority to JP15161892A priority Critical patent/JP3197338B2/en
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Links

Abstract

PURPOSE:To increase the jet speed of an ink droplet by generating a large pressure change by applying a main pulse at the time of the peak of a residual pressure wave noticing the residual pressure wave generated accompanying the displacement of a piezoelectric element. CONSTITUTION:A piezoelectric element is changed by a drive pulse shown by (a) and the volumetric contraction of a passage is generated and a generated pressure wave reaches the wall surface of the passage or a vibration plate to become a residual pressure wave shown by (b). This pressure wave also exterts effect on a meniscus to become a form reversed in phase as shown by (c). By applying a main driving pulse at the time of the peak of the residual pressure wave generated by the application of an auxiliary pulse, more large pressure can be applied.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【技術分野】本発明は、インクジェットヘッドの駆動方
法に関し、より詳細には、補助パルス印加と残留振動と
の組合せによりインク滴の噴射速度を上げるようにした
インクジェットヘッドの駆動方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving an inkjet head, and more particularly, to a method for driving an inkjet head in which an ejection speed of ink drops is increased by a combination of application of an auxiliary pulse and residual vibration.
【0002】[0002]
【従来技術】図2(a),(b)は、従来のオンデマン
ド型インクジェットヘッドの構成図で、、図(a)は側
断面図、図(b)は図(a)のA−A線断面図である。
図中、1は基板、2は圧電素子、3は流路板、3aは流
路(加圧室)、3bは壁部、4は共通液室構成部材、4
aは共通液室、5はインク供給パイプ、6はノズルプレ
ート、6aはノズル、7は駆動用回路プリント板(PC
B)、8はリード線、9は駆動電極、10は充填剤、1
1は保護板、12は流体抵抗、13,14は電極、15
は上部隔壁である。
2 (a) and 2 (b) are configuration diagrams of a conventional on-demand type ink jet head, wherein FIG. 2 (a) is a side sectional view and FIG. 2 (b) is A-A in FIG. 2 (a). It is a line sectional view.
In the figure, 1 is a substrate, 2 is a piezoelectric element, 3 is a flow path plate, 3a is a flow path (pressurizing chamber), 3b is a wall portion, 4 is a common liquid chamber constituent member, 4
a is a common liquid chamber, 5 is an ink supply pipe, 6 is a nozzle plate, 6a is a nozzle, and 7 is a drive circuit printed board (PC).
B), 8 is a lead wire, 9 is a drive electrode, 10 is a filler, 1
1 is a protective plate, 12 is a fluid resistance, 13 and 14 are electrodes, 15
Is the upper partition.
【0003】集積化されたヘッドにおいて、電極13,
14を有する積層された圧電素子2は、流路3aに対応
して、該流路3a方向に溝加工が施され、溝10、駆動
圧電素子2b、非駆動圧電素子2aに区分される。溝1
0には充填剤が封入されている。溝加工が施された圧電
素子2には上部隔壁15を介して流路板3が接合され
る。すなわち前記上部隔壁15は、非駆動圧電素子2a
と隣接する流路3aを隔てる壁部3bとで支持される。
駆動圧電素子2aの幅は流路3aの幅よりも僅かに狭く
選んでいる。駆動用回路プリント板(PCB)上の駆動
回路により駆動圧電素子2bには一定の電圧が印加さ
れ、流路3aの体積を縮小している。印字において選択
された駆動圧電素子2bにパルス状信号電圧(信号パル
ス)を印加すると、該信号パルスの立下げにより流路3
aの体積は増加してインクを吸入し、信号パルスの立上
げにより該駆動圧電素子2bは厚み方向に変位し、上部
隔壁15を介して流路3aの容積が急速に縮小し、その
結果ノズル板6のノズル6aよりインク液滴を吐出す
る。
In the integrated head, the electrodes 13,
The laminated piezoelectric element 2 having 14 is grooved in the direction of the flow path 3a corresponding to the flow path 3a, and is divided into the groove 10, the driving piezoelectric element 2b, and the non-driving piezoelectric element 2a. Groove 1
Filler is enclosed in 0. The flow path plate 3 is joined to the grooved piezoelectric element 2 through the upper partition wall 15. That is, the upper partition 15 is formed of the non-driving piezoelectric element 2a.
And a wall portion 3b that separates the adjacent flow path 3a.
The width of the driving piezoelectric element 2a is selected to be slightly narrower than the width of the flow path 3a. A constant voltage is applied to the drive piezoelectric element 2b by the drive circuit on the drive circuit printed board (PCB), and the volume of the flow path 3a is reduced. When a pulsed signal voltage (signal pulse) is applied to the drive piezoelectric element 2b selected in printing, the flow path 3 is lowered by the fall of the signal pulse.
The volume of a increases and the ink is sucked, and the driving piezoelectric element 2b is displaced in the thickness direction by the rise of the signal pulse, and the volume of the flow path 3a is rapidly reduced through the upper partition wall 15, resulting in the nozzle. Ink droplets are ejected from the nozzle 6a of the plate 6.
【0004】このように、図2(a),(b)に示すよ
うな構成のインクジェットヘッドにおいて、図3(a)
に示すような凸型の駆動パルスを印加することによりイ
ンクの噴射を行っていた。しかし、噴射されるインク滴
はその駆動周波数によって図4に示すような変動を見
せ、画像上のドット径をばらつかせる原因となってい
た。
As described above, in the ink jet head having the structure shown in FIGS. 2A and 2B, FIG.
Ink was ejected by applying a convex drive pulse as shown in FIG. However, the ejected ink droplets fluctuate as shown in FIG. 4 depending on the driving frequency, which causes variation in the dot diameter on the image.
【0005】この点を解決するために、例えば、特開昭
59ー176055号公報、特開昭59ー143653
号公報、特公平3ー30506号公報に記載されている
ように、図3(b)に示すように、メインの駆動パルス
の前に波高値またはパルス幅の異なった補助パルスを印
加し、この波高値もしくはパルス幅、補助パルス印加
後、適切な間隔をおいてメインパルスを印加することに
よりインク噴射量を制御できるようにしたものがある。
すなわち、インク噴射量を増加させてドット径を制御す
るものである。
In order to solve this point, for example, JP-A-59-176055 and JP-A-59-143653.
As described in Japanese Patent Publication No. 30506/1990, as shown in FIG. 3B, an auxiliary pulse having a different peak value or pulse width is applied before the main drive pulse. There is a device in which the ink ejection amount can be controlled by applying a main pulse at an appropriate interval after applying a crest value or a pulse width and an auxiliary pulse.
That is, the dot diameter is controlled by increasing the ink ejection amount.
【0006】しかし、実際には、図5(a)〜(c)に
示すように、補助パルス印加により発生する図(a)に
示すようなメニスカス振動よりも、インク滴吐出及びそ
の後のインク供給能力に応じて発生する図(b)のよう
なメニスカス振動の方がずっと大きい。この2つのメニ
スカス振動が合成されたものが図(c)であり、補助パ
ルス印加にもかかわらず、高周波数域では大きくメニス
カス面がノズル内に引き込んでしまい、インク噴射量の
増加には結びつかない。
However, in reality, as shown in FIGS. 5A to 5C, ink drop ejection and subsequent ink supply are more effective than the meniscus vibration shown in FIG. 5A generated by the auxiliary pulse application. The meniscus vibration as shown in Fig. (B), which is generated according to the ability, is much larger. The combination of these two meniscus vibrations is shown in FIG. (C). In spite of the application of the auxiliary pulse, the meniscus surface is largely drawn into the nozzle in the high frequency range, which does not lead to an increase in the ink ejection amount. .
【0007】[0007]
【目的】本発明は、上述のごとき実情に鑑みてなされた
もので、メニスカス振動にではなく、圧電素子の変位に
ともなって発生する残留圧力波に着目し、該残留圧力波
のピーク時にメインパルスを印加することによって、電
圧を上げることなく、より大きな圧力変化を起こしてイ
ンク滴の噴射速度を上げること、すなわち、インクの噴
射速度を上げ、インク滴が記録紙に衝突した時の広がり
を大きくすることによってドット径低下を回避するよう
にしたインクジェットヘッドの駆動方法を提供すること
を目的としてなされたものである。
[Object] The present invention has been made in view of the above situation, and pays attention to a residual pressure wave generated due to displacement of a piezoelectric element, not to a meniscus vibration, and a main pulse at the peak of the residual pressure wave. By applying a voltage, a larger pressure change is generated without increasing the voltage to increase the ink droplet ejection speed, that is, the ink ejection speed is increased to increase the spread when the ink droplet collides with the recording paper. By doing so, it is an object of the present invention to provide a method of driving an inkjet head that avoids a decrease in dot diameter.
【0008】[0008]
【構成】本発明は、上記目的を達成するために、(1)
流路の長手方向に対し互いに間隔をあけて配設された複
数の平行流路と、該平行流路の各々に接続されてインク
滴を噴射するノズルと、前記平行流路にインクを供給す
る供給手段と、前記平行流路の長手方向に垂直な方向に
変位を与え、該平行流路の容積を可変とする圧電素子と
から成り、選択された流路に対して、流路容積を減小さ
せる向きに圧電素子を変位させるパルス信号を印加する
ことで流路に対応するノズルからインク滴を噴射させる
インクジェットヘッドの駆動方法において、前記パルス
信号が印加される前に、波高値またはパルス幅の異なる
補助パルスを印加し、該補助パルスによって発生する残
留圧力波の周期に合わせてメインパルス信号を印加する
こと、更には、(2)インクの噴射量の低下によるドッ
ト画像の径の低下を防ぐように、インクの噴射スピード
を上げること、更には、(3)インク噴射量の低下によ
るドット画像の径の低下を防ぐように、高周波駆動時に
補助パルスを印加して、インクの噴射スピードを上げる
ことを特徴としたものである。以下、本発明の実施例に
基づいて説明する。
In order to achieve the above object, the present invention provides (1)
A plurality of parallel flow channels arranged at intervals in the longitudinal direction of the flow channels, nozzles connected to each of the parallel flow channels to eject ink droplets, and ink is supplied to the parallel flow channels. It comprises a supply means and a piezoelectric element that displaces in a direction perpendicular to the longitudinal direction of the parallel flow passages to make the volume of the parallel flow passages variable, and reduces the flow passage volume with respect to the selected flow passage. In a method of driving an inkjet head in which ink droplets are ejected from nozzles corresponding to a flow path by applying a pulse signal that displaces a piezoelectric element in a direction to reduce the pulse height, a peak value or pulse width is applied before the pulse signal is applied. Different auxiliary pulses are applied, and the main pulse signal is applied in synchronization with the cycle of the residual pressure wave generated by the auxiliary pulses, and (2) the diameter of the dot image is reduced due to the reduction in the ink ejection amount. To prevent this, increase the ink ejection speed, and (3) apply an auxiliary pulse during high frequency driving to prevent the ink image ejection speed from decreasing due to a decrease in the ink ejection amount, thereby increasing the ink ejection speed. It is characterized by raising. Hereinafter, description will be given based on examples of the present invention.
【0009】図1(a)〜(c)は、本発明によるイン
クジェットヘッドの駆動方法の一実施例を説明するため
の図である。図(a)は駆動パルス、図(b)は補助パ
ルス印加による残留圧力波、図(c)は補助パルス印加
によるメニスカス変化を各々示している。
FIGS. 1A to 1C are views for explaining an embodiment of a method of driving an ink jet head according to the present invention. FIG. 7A shows a drive pulse, FIG. 8B shows a residual pressure wave by applying an auxiliary pulse, and FIG. 8C shows a meniscus change by applying an auxiliary pulse.
【0010】通常、駆動パルスの印加により圧電素子
(PZT)が変位し、流路の容積収縮が起こり、この時
発生した圧力波は流路の壁面や振動板等に達し、その厚
さや長さ、固有振動数、インク物性に応じた共振を起こ
し、図(b)の示すような残留圧力波となる。圧電素子
の変位による圧力波はメニスカスにも影響を与えるが、
この場合は、図(c)に示すように、ほぼ位相が逆転
し、また伝播速度の違いのためやや遅れた形となってい
る。ここで、図(a),(b)のように、補助パルス印
加により発生した残留圧力波のピーク時にメインの駆動
パルスを印加することにより、本来圧電素子の変位で得
られる以上の圧力を印加することができる。これは駆動
電圧Vpを上げた時と同じ効果が得られ、インク噴射速
度及び噴射量が増える上に、駆動電圧Vpを上げること
による弊害となる発熱や、騒音がないという利点があ
る。残留振動の周期は流路の長さや厚さ、材質により調
整でき、振幅については補助パルスの立上げや立下げの
時定数を変えることによって調整できる。
Usually, the piezoelectric element (PZT) is displaced by the application of a drive pulse, and the volumetric contraction of the flow path occurs, and the pressure wave generated at this time reaches the wall surface of the flow path, the diaphragm, etc., and its thickness and length. Resonance occurs depending on the natural frequency and the physical properties of the ink, resulting in a residual pressure wave as shown in FIG. The pressure wave due to the displacement of the piezoelectric element also affects the meniscus,
In this case, as shown in FIG. 7C, the phases are almost reversed, and there is a slight delay due to the difference in propagation speed. Here, as shown in FIGS. (A) and (b), by applying the main drive pulse at the peak of the residual pressure wave generated by the application of the auxiliary pulse, the pressure higher than that originally obtained by the displacement of the piezoelectric element is applied. can do. This has the same effect as when the drive voltage Vp is raised, and has the advantage that the ink ejection speed and the ejection amount are increased, and there is no heat generation or noise which is a harmful effect due to the drive voltage Vp. The cycle of residual vibration can be adjusted by the length, thickness, and material of the flow path, and the amplitude can be adjusted by changing the time constants for raising and lowering the auxiliary pulse.
【0011】このように、本発明においては、駆動パル
ス信号が印加される前に、波高値又はパルス幅の異なる
補助パルスを印加し、該補助パルスによって発生する残
留圧力波の周期に合わせてメインパルス信号を印加する
ことにより、電圧を上げることなく、より大きな圧力変
化を起こしてインク滴の噴射速度を上げることができ
る。また、インクの噴射量の低下によるドット画像の径
の低下を防ぐように、高周波駆動時に補助パルスを印加
し、インクの噴射スピードを上げる。
As described above, in the present invention, before the drive pulse signal is applied, the auxiliary pulse having a different peak value or pulse width is applied, and the main pulse is adjusted in accordance with the cycle of the residual pressure wave generated by the auxiliary pulse. By applying the pulse signal, it is possible to increase the pressure change and increase the ink droplet ejection speed without increasing the voltage. Further, in order to prevent the diameter of the dot image from decreasing due to the decrease in the ink ejection amount, an auxiliary pulse is applied during high frequency driving to increase the ink ejection speed.
【0012】[0012]
【効果】以上の説明から明らかなように、本発明による
と、以下のような効果がある。 (1)補助パルス印加及び残留振動との組合せによりイ
ンク滴の噴射速度を上げ、記録紙にインク滴が衝突した
時のインクの広がりを大きくし、ドット径の低下が抑え
られる。 (2)駆動電圧を上げた時と同じようにインク噴射速度
と噴射量を共に増す一方、発熱や騒音といった問題を避
られる。
[Effect] As is apparent from the above description, the present invention has the following effects. (1) By combining the application of the auxiliary pulse and the residual vibration, the ejection speed of the ink droplet is increased, the spread of the ink when the ink droplet collides with the recording paper is enlarged, and the reduction of the dot diameter is suppressed. (2) While the ink ejection speed and the ejection amount are both increased in the same manner as when the drive voltage is increased, the problems such as heat generation and noise can be avoided.
【図面の簡単な説明】[Brief description of drawings]
【図1】 本発明によるインクジェットヘッドの駆動方
法の一実施例を説明するための図である。
FIG. 1 is a diagram illustrating an embodiment of a method of driving an inkjet head according to the present invention.
【図2】 従来のオンデマンド型インクジェットヘッド
の構成図である。
FIG. 2 is a configuration diagram of a conventional on-demand type inkjet head.
【図3】 従来の駆動パルスを示す図である。FIG. 3 is a diagram showing a conventional drive pulse.
【図4】 従来の吐出量と駆動周波数の関係を示す図で
ある。
FIG. 4 is a diagram showing a conventional relationship between a discharge amount and a driving frequency.
【図5】 従来のメニスカスの変位量を示す図である。FIG. 5 is a diagram showing a displacement amount of a conventional meniscus.
【符号の説明】[Explanation of symbols]
1…基板、2…圧電素子、3…流路板、3a…流路(加
圧室)、3b…壁部、4…共通液室構成部材、4a…共
通液室、5…インク供給パイプ、6…ノズルプレート、
6a…ノズル、7…駆動用回路プリント板(PCB)、
8…リード線、9…駆動電極、10…充填剤、11…保
護板、12…流体抵抗、13,14…電極、15…上部
隔壁。
DESCRIPTION OF SYMBOLS 1 ... Substrate, 2 ... Piezoelectric element, 3 ... Flow path plate, 3a ... Flow path (pressurizing chamber), 3b ... Wall part, 4 ... Common liquid chamber constituent member, 4a ... Common liquid chamber, 5 ... Ink supply pipe, 6 ... Nozzle plate,
6a ... Nozzle, 7 ... Driving circuit printed board (PCB),
8 ... Lead wire, 9 ... Drive electrode, 10 ... Filler, 11 ... Protective plate, 12 ... Fluid resistance, 13, 14 ... Electrode, 15 ... Upper partition wall.

Claims (3)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 流路の長手方向に対し互いに間隔をあけ
    て配設された複数の平行流路と、該平行流路の各々に接
    続されてインク滴を噴射するノズルと、前記平行流路に
    インクを供給する供給手段と、前記平行流路の長手方向
    に垂直な方向に変位を与え、該平行流路の容積を可変と
    する圧電素子とから成り、選択された流路に対して、流
    路容積を減小させる向きに圧電素子を変位させるパルス
    信号を印加することで流路に対応するノズルからインク
    滴を噴射させるインクジェットヘッドの駆動方法におい
    て、前記パルス信号が印加される前に、波高値またはパ
    ルス幅の異なる補助パルスを印加し、該補助パルスによ
    って発生する残留圧力波の周期に合わせてメインパルス
    信号を印加す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 plurality of parallel flow paths arranged at intervals in the longitudinal direction of the flow path, nozzles connected to each of the parallel flow paths to eject ink droplets, and the parallel flow path. To the selected flow path, comprising a supply means for supplying ink to the, and a piezoelectric element for displacing in a direction perpendicular to the longitudinal direction of the parallel flow path to make the volume of the parallel flow path variable. In a method of driving an inkjet head that ejects ink droplets from nozzles corresponding to a flow path by applying a pulse signal that displaces a piezoelectric element in a direction that reduces the flow path volume, before the pulse signal is applied, A method for driving an inkjet head, characterized in that an auxiliary pulse having a different peak value or pulse width is applied, and a main pulse signal is applied in synchronization with a cycle of a residual pressure wave generated by the auxiliary pulse.
  2. 【請求項2】 インクの噴射量の低下によるドット画像
    の径の低下を防ぐように、インクの噴射スピードを上げ
    ることを特徴とする請求項1記載のインクジェットヘッ
    ドの駆動方法。
    2. The method for driving an ink jet head according to claim 1, wherein the ink ejection speed is increased so as to prevent the diameter of the dot image from decreasing due to the decrease in the ink ejection amount.
  3. 【請求項3】 インクの噴射量の低下によるドット画像
    の径の低下を防ぐように、高周波駆動時に補助パルスを
    印加して、インクの噴射スピードを上げることを特徴と
    する請求項1記載のインクジェットヘッドの駆動方法。
    3. The inkjet according to claim 1, wherein an auxiliary pulse is applied during high frequency driving to increase the ink ejection speed so as to prevent the diameter of the dot image from decreasing due to the decrease in the ink ejection amount. How to drive the head.
JP15161892A 1992-05-19 1992-05-19 Driving method of inkjet head Expired - Lifetime JP3197338B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15161892A JP3197338B2 (en) 1992-05-19 1992-05-19 Driving method of inkjet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15161892A JP3197338B2 (en) 1992-05-19 1992-05-19 Driving method of inkjet head

Publications (2)

Publication Number Publication Date
JPH05318766A true JPH05318766A (en) 1993-12-03
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6471316B1 (en) 1998-12-09 2002-10-29 Nec Corporation Ink-jet printer in which high speed printing is possible
JP2010179494A (en) * 2009-02-03 2010-08-19 Seiko Epson Corp Liquid discharging apparatus and liquid discharging method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6471316B1 (en) 1998-12-09 2002-10-29 Nec Corporation Ink-jet printer in which high speed printing is possible
JP2010179494A (en) * 2009-02-03 2010-08-19 Seiko Epson Corp Liquid discharging apparatus and liquid discharging method
US8657400B2 (en) 2009-02-03 2014-02-25 Seiko Epson Corporation Liquid discharging apparatus and liquid discharging method

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