JP7367778B2 - Inkjet recording device and recording operation driving method - Google Patents

Inkjet recording device and recording operation driving method Download PDF

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JP7367778B2
JP7367778B2 JP2021571107A JP2021571107A JP7367778B2 JP 7367778 B2 JP7367778 B2 JP 7367778B2 JP 2021571107 A JP2021571107 A JP 2021571107A JP 2021571107 A JP2021571107 A JP 2021571107A JP 7367778 B2 JP7367778 B2 JP 7367778B2
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ejection
ink
nozzle
drive pulse
recording operation
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シンズ 李
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Konica Minolta Inc
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    • 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
    • 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
    • B41J2/04595—Dot-size modulation by changing the number of drops per dot
    • 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
    • B41J2/04596—Non-ejecting pulses
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/10—Finger type piezoelectric elements

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Description

本発明は、インクジェット記録装置及び記録動作駆動方法に関する。 The present invention relates to an inkjet printing apparatus and a printing operation driving method.

従来、インクジェットヘッドを通してインクを循環させ、そのインクジェットヘッドのノズルからインクを吐出するインクジェット装置が知られている。
一般にインクジェット記録装置は、微小なインク液滴を吐出する多数のノズルが配置されたインクジェットヘッドを搭載している。
これらのノズルは微小な径の吐出口からインクを吐出するため、吐出前のノズルに形成されるメニスカスの状態は、液滴の飛翔状態へ顕著に影響を与える、すなわち印刷物の画質に関わる。インクジェットヘッドノズルから吐出する液滴の安定性向上は、印刷物の画質に関わるため重要な課題である。2. Description of the Related Art Conventionally, inkjet devices are known that circulate ink through an inkjet head and eject the ink from nozzles of the inkjet head.
Generally, an inkjet recording apparatus is equipped with an inkjet head in which a large number of nozzles are arranged to eject minute ink droplets.
Since these nozzles eject ink from ejection ports with minute diameters, the state of the meniscus formed in the nozzle before ejection significantly affects the flying state of droplets, that is, it is related to the image quality of printed matter. Improving the stability of droplets ejected from inkjet head nozzles is an important issue because it is related to the image quality of printed matter.

一方、複数の駆動パルスを含むマルチ駆動信号を生成し、相対的に大きい液滴を吐出することが実現されている。
しかしながら、吐出、不吐出の繰り返しの際に、吐出前のメニスカスの状態及び位置も変わる。このため、不吐出期間の後の吐出時においては、液滴の不吐出や飛翔曲がりなどにより、吐出が不安定になる可能性が高くなる。On the other hand, it has been realized that a multi-drive signal including a plurality of drive pulses is generated to eject relatively large droplets.
However, when ejection and non-ejection are repeated, the state and position of the meniscus before ejection also changes. Therefore, during ejection after the non-ejection period, there is a high possibility that ejection becomes unstable due to non-ejection of droplets or deflection of flight.

特許文献１に記載の発明は、ノズルのエッジに付着した異物に起因する吐出異常を防止するため、メニスカスを非吐出ノズルの外側へ移動させる非吐出駆動電圧をインクジェットヘッドに供給する。このとき、非吐出ノズルの直径ｄｎと非吐出ノズルの外側へ移動されたメニスカス直径ｄｍとの関係が１．１≦ｄｍ／ｄｎ≦１．４を満たすようにする。 The invention described in Patent Document 1 supplies an inkjet head with a non-ejection driving voltage that moves a meniscus to the outside of a non-ejecting nozzle in order to prevent ejection abnormalities caused by foreign matter attached to the edge of a nozzle. At this time, the relationship between the diameter dn of the non-discharge nozzle and the meniscus diameter dm moved to the outside of the non-discharge nozzle is made to satisfy 1.1≦dm/dn≦1.4.

特開２０１３-１９９０２１号公報JP2013-199021A

しかしながら、特許文献１に記載の発明は、異物付着による吐出異常を防止することを目的としており、非吐出駆動電圧により形成するメニスカスは静定的である。
特許文献１に記載の発明のように非吐出時に静定的なメニスカスを形成することによっても、その後の吐出時における液滴の不吐出や飛翔曲がりなどを発生させる不安定性を解消することができない。However, the invention described in Patent Document 1 aims to prevent ejection abnormalities due to adhesion of foreign matter, and the meniscus formed by the non-ejection drive voltage is static.
Even by forming a static meniscus during non-ejection as in the invention described in Patent Document 1, it is not possible to eliminate instability that causes droplet non-ejection or flight deflection during subsequent ejection. .

本発明は以上の従来技術における問題に鑑みてなされたものであって、インクジェット記録装置により安定的に大液滴を吐出することを課題とする。 The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to stably eject large droplets using an inkjet recording device.

本発明の一態様は、ノズルに連通する圧力室を有し、前記圧力室内のインクを、前記ノズルから吐出するインクジェットヘッドと、
前記インクジェットヘッドによる記録動作を駆動するヘッド駆動部と、を備え、
前記ヘッド駆動部は、
前記圧力室を膨張、収縮させる駆動パルス電圧であって、前記ノズルからインクを吐出させる吐出駆動パルスと、前記ノズルからインクを吐出させずに前記ノズルに形成されるメニスカスを挙動させる程度の非吐出駆動パルスとを、印加可能にされ、
記録動作時における１ドット形成のためのインク吐出期間には、記録媒体上に着弾させる１ドットに対し階調数ｎを上限とした回数の吐出駆動パルスを印加して、当該回数に応じてドット径を変える吐出駆動を実行し、
記録動作時におけるインク非吐出期間には、前記１ドット形成のためのインク吐出期間と等しい期間に対し、前記階調数ｎに等しい回数であるｍ回の非吐出駆動パルスを印加して、前記メニスカスを挙動させる非吐出駆動を実行するインクジェット記録装置である。 One aspect of the present invention includes an inkjet head having a pressure chamber communicating with a nozzle and ejecting ink in the pressure chamber from the nozzle;
a head drive unit that drives a recording operation by the inkjet head,
The head driving section includes:
A drive pulse voltage that expands and contracts the pressure chamber, and includes an ejection drive pulse that causes ink to be ejected from the nozzle, and a non-ejection drive pulse that causes a meniscus formed in the nozzle to behave without ejecting ink from the nozzle. The drive pulse is enabled to be applied,
During the ink ejection period for forming one dot during the recording operation, ejection drive pulses are applied a number of times with the upper limit of the number of gradations n to each dot that lands on the recording medium, and dots are ejected according to the number of times. Executes a discharge drive that changes the diameter,
During the ink non-ejection period during the recording operation, m times of non-ejection drive pulses, which are equal to the number of gradations n, are applied for a period equal to the ink ejection period for forming one dot. The present invention is an inkjet recording apparatus that performs non-ejection driving that causes the meniscus to behave.

本発明の一態様は、ノズルに連通する圧力室を有し、前記圧力室内のインクを、前記ノズルから吐出するインクジェットヘッドによる記録動作を駆動する記録動作駆動方法であって、
前記圧力室を膨張、収縮させる駆動パルス電圧であって、前記ノズルからインクを吐出させる吐出駆動パルスと、前記ノズルからインクを吐出させずに前記ノズルに形成されるメニスカスを挙動させる程度の非吐出駆動パルスとを用い、
記録動作時における１ドット形成のためのインク吐出期間には、記録媒体上に着弾させる１ドットに対し階調数ｎを上限とした回数の吐出駆動パルスを印加して、当該回数に応じてドット径を変える吐出駆動を実行し、
記録動作時におけるインク非吐出期間には、前記１ドット形成のためのインク吐出期間と等しい期間に対し、前記階調数ｎに等しい回数であるｍ回の非吐出駆動パルスを印加して、前記メニスカスを挙動させる非吐出駆動を実行する記録動作駆動方法である。 One aspect of the present invention is a recording operation driving method for driving a recording operation by an inkjet head having a pressure chamber communicating with a nozzle and ejecting ink in the pressure chamber from the nozzle, the method comprising:
A drive pulse voltage that expands and contracts the pressure chamber, and includes an ejection drive pulse that causes ink to be ejected from the nozzle, and a non-ejection drive pulse that causes a meniscus formed in the nozzle to behave without ejecting ink from the nozzle. Using a driving pulse,
During the ink ejection period for forming one dot during the recording operation, ejection drive pulses are applied a number of times with the upper limit of the number of gradations n to each dot that lands on the recording medium, and dots are ejected according to the number of times. Executes a discharge drive that changes the diameter,
During the ink non-ejection period during the recording operation, m times of non-ejection drive pulses, which are equal to the number of gradations n, are applied for a period equal to the ink ejection period for forming one dot. This is a recording operation driving method that executes non-ejection driving that causes the meniscus to behave.

本発明によれば、インクジェット記録装置により安定的に大液滴を吐出することができる。 According to the present invention, large droplets can be stably ejected by an inkjet recording device.

本発明の一実施形態に係るインクジェット記録装置の機能構成を示すブロック図である。1 is a block diagram showing a functional configuration of an inkjet recording apparatus according to an embodiment of the present invention. ノズルの軸方向に見た圧力室とノズルの模式図であって、駆動パルス電圧に対応した圧力室の変化を示す。FIG. 2 is a schematic diagram of a pressure chamber and a nozzle viewed in the axial direction of the nozzle, showing changes in the pressure chamber in response to drive pulse voltage. ノズルから吐出されるインク液滴の動作を示す模式図である。FIG. 3 is a schematic diagram showing the operation of ink droplets ejected from a nozzle. 本発明の一実施形態に係る駆動パルス電圧の例を示す駆動信号波形図である。FIG. 3 is a drive signal waveform diagram showing an example of a drive pulse voltage according to an embodiment of the present invention. 比較例に係る駆動パルス電圧を示す駆動信号波形図である。FIG. 7 is a drive signal waveform diagram showing a drive pulse voltage according to a comparative example. ノズルと静的安定状態のメニスカスの断面図である。FIG. 3 is a cross-sectional view of the nozzle and meniscus in static steady state. ノズルと連続吐出後のメニスカスの断面図である。FIG. 3 is a cross-sectional view of a nozzle and a meniscus after continuous discharge.

以下に本発明の一実施形態につき図面を参照して説明する。以下は本発明の一実施形態であって本発明を限定するものではない。 An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and is not intended to limit the present invention.

インクジェット記録装置１は、搬送部１０と、記録動作部２０と、クリーニング部３０と、制御部４０と、記憶部５０と、通信部７０と、操作受付部８１と、表示部８２、電力供給部９０などを備える。 The inkjet recording apparatus 1 includes a transport section 10, a recording operation section 20, a cleaning section 30, a control section 40, a storage section 50, a communication section 70, an operation reception section 81, a display section 82, and a power supply section. 90 etc.

搬送部１０は、画像を記録する対象となる記録媒体を記録動作部２０による記録範囲に対向するように移動させる。搬送部１０は、例えば、ロール状に巻き上げられた長尺の記録媒体を所定の速度で引き出す搬送モーター１４などを備える。記録媒体は、例えば、布帛であるが、紙など他の材質であってもよい。 The conveyance section 10 moves a recording medium on which an image is to be recorded so as to face a recording range by the recording operation section 20 . The transport unit 10 includes, for example, a transport motor 14 that pulls out a long recording medium wound up into a roll at a predetermined speed. The recording medium is, for example, cloth, but may be made of other materials such as paper.

記録動作部２０は、記録媒体上にインクを吐出して画像を記録する動作を行う。記録動作部２０は、多数が所定のパターンで配列されてインクを吐出するノズル２７と、ノズル２７にインクを供給するインク流路（圧力室）を変形させてインクに圧力変動を付与する圧電素子２６とを有するインクジェットヘッド２１と、各圧電素子２６を変形させる駆動パルス電圧を出力するヘッド駆動部２５などを備える。
圧電素子２６に図２に示すように駆動パルス電圧Ｐを印加することで、ノズル２７に連通する圧力室２８の側壁２９を変形させ、図３に示すようにノズル２７の吐出開口付近に形成されたメニスカス２２を揺らして、インク液滴２３をメニスカス２２から分離させて吐出する。The recording operation section 20 performs an operation of recording an image by discharging ink onto a recording medium. The recording operation unit 20 includes a large number of nozzles 27 arranged in a predetermined pattern to eject ink, and a piezoelectric element that deforms an ink flow path (pressure chamber) that supplies ink to the nozzles 27 to apply pressure fluctuations to the ink. 26, a head drive unit 25 that outputs a drive pulse voltage that deforms each piezoelectric element 26, and the like.
By applying a driving pulse voltage P to the piezoelectric element 26 as shown in FIG. 2, the side wall 29 of the pressure chamber 28 communicating with the nozzle 27 is deformed, and a pressure chamber 28 is formed near the discharge opening of the nozzle 27 as shown in FIG. The ink droplets 23 are separated from the meniscus 22 and ejected by shaking the meniscus 22.

クリーニング部３０は、ノズル２７の開口が配列されたノズル面に付着したインクやその固化物などを除去するワイピング部材３２と、当該ワイピング部材３２を動作させる駆動部３１などを備える。ワイピング部材３２は、特には限られないが、例えば、インクを吸い込む不織布や、固体を削り取るブレード上の樹脂部材などである。 The cleaning unit 30 includes a wiping member 32 that removes ink and its solidified matter adhering to the nozzle surface where the openings of the nozzles 27 are arranged, a drive unit 31 that operates the wiping member 32, and the like. The wiping member 32 is, for example, a non-woven fabric that sucks ink, a resin member on a blade that scrapes off solids, etc., although it is not particularly limited.

制御部４０は、インクジェット記録装置１の全体動作を統括制御するプロセッサーである。制御部４０は、例えば、ＣＰＵ４１（Central Processing Unit）及びＲＡＭ４２（Random Access Memory）などを備える。ＣＰＵ４１は、演算動作を行い、各種制御処理を行う。ＲＡＭ４２は、ＣＰＵ４１に作業用のメモリー空間を提供し、一時データを記憶する。 The control unit 40 is a processor that centrally controls the overall operation of the inkjet recording apparatus 1. The control unit 40 includes, for example, a CPU 41 (Central Processing Unit) and a RAM 42 (Random Access Memory). The CPU 41 performs arithmetic operations and performs various control processes. The RAM 42 provides a working memory space for the CPU 41 and stores temporary data.

記憶部５０は、記録対象の画像データやその処理データを記憶したり、その他の設定データやプログラムなどを記憶したりする。画像データは、例えば、一時的に大容量の記憶を行って高速出力が可能なＤＲＡＭなどに記憶されてよい。また、設定データやプログラムなどは、インクジェット記録装置１への電力供給が停止された状況でも記憶可能なフラッシュメモリといった不揮発性メモリー、及び／又はＨＤＤ（Hard Disk Drive）などに記憶される。 The storage unit 50 stores image data to be recorded and its processed data, as well as other setting data and programs. The image data may be stored in, for example, a DRAM that can temporarily store large amounts of data and output at high speed. Further, setting data, programs, and the like are stored in a nonvolatile memory such as a flash memory that can be stored even when power supply to the inkjet recording apparatus 1 is stopped, and/or an HDD (Hard Disk Drive).

通信部７０は、所定の通信規格（例えば、ＴＣＰ／ＩＰ）に従って外部機器とのデータ送受信を制御する。通信部７０は、ＬＡＮ（Local Area Network）などに接続され、ルーターなどを介して外部インターネットと接続可能であってもよいし、ＵＳＢ端子に接続されたＵＳＢケーブルを介して直接周辺機器と接続可能であってもよい。
電力供給部９０は、電源からインクジェット記録装置１に電力を供給する。The communication unit 70 controls data transmission and reception with external devices according to a predetermined communication standard (eg, TCP/IP). The communication unit 70 may be connected to a LAN (Local Area Network) or the like, and may be connectable to the external Internet via a router or the like, or directly connectable to peripheral devices via a USB cable connected to a USB terminal. It may be.
The power supply unit 90 supplies power to the inkjet recording apparatus 1 from a power source.

次に、記録動作の駆動につき説明する。
ヘッド駆動部２５は、圧力室２８を膨張、収縮させる駆動パルス電圧Ｐを圧電素子２６に印加する。駆動パルス電圧Ｐとしては図４に示す２種類（Ｐａ，Ｐｂ）が用いられる。ヘッド駆動部２５は、ノズル２７からインクを吐出させる吐出駆動パルスＰａと、ノズル２７からインクを吐出させずにノズル２７に形成されるメニスカス２２を挙動させる程度の非吐出駆動パルスＰｂとを、印加可能にされている。
吐出駆動パルスＰａの電圧値をＶａ、パルス幅（パルスの立ち上がりから立下り開始時までの時間）をＰｗａ、非吐出駆動パルスＰｂの電圧値をＶｂ、パルス幅をＰｗｂとする。Next, the driving of the recording operation will be explained.
The head drive unit 25 applies a drive pulse voltage P to the piezoelectric element 26 to expand and contract the pressure chamber 28 . As the drive pulse voltage P, two types (Pa, Pb) shown in FIG. 4 are used. The head drive unit 25 applies an ejection drive pulse Pa that causes ink to be ejected from the nozzle 27 and a non-ejection drive pulse Pb that causes the meniscus 22 formed in the nozzle 27 to behave without causing the nozzle 27 to eject ink. is made possible.
It is assumed that the voltage value of the ejection drive pulse Pa is Va, the pulse width (time from the rise of the pulse to the start of the fall) is Pwa, the voltage value of the non-ejection drive pulse Pb is Vb, and the pulse width is Pwb.

ヘッド駆動部２５は、記録動作時における１ドット形成のためのインク吐出期間Ｔａ（＝周期Ｔ）には、記録媒体上に着弾させる１ドットに対し階調数ｎを上限とした回数の吐出駆動パルスを印加して、当該回数に応じてドット径を変える吐出駆動を実行する。
本実施形態では、ｎ＝８としている。
図４に示す例では、最も大きなドット径を形成するため周期Ｔにおいて８パルスの吐出駆動パルスＰａを印加している。
吐出駆動パルスＰａの１パルスごとの印加により図３に示したようにインク液滴が吐出され、記録媒体上に着弾する。
吐出駆動パルスＰａのパルス数を選択することで吐出される液滴数が選択されてドット径が変わる。インクジェット記録装置１は、これにより階調表現を行う記録方式を採用する。During the ink ejection period Ta (=period T) for forming one dot during the recording operation, the head drive unit 25 performs ejection drive a number of times with the upper limit of the number of gradations n for one dot to land on the recording medium. A pulse is applied to perform ejection driving in which the dot diameter is changed according to the number of times.
In this embodiment, n=8.
In the example shown in FIG. 4, eight ejection drive pulses Pa are applied in period T to form the largest dot diameter.
By applying the ejection drive pulse Pa pulse by pulse, ink droplets are ejected as shown in FIG. 3 and land on the recording medium.
By selecting the number of ejection drive pulses Pa, the number of droplets to be ejected is selected and the dot diameter is changed. The inkjet recording apparatus 1 employs a recording method that expresses gradation using this method.

ヘッド駆動部２５は、記録動作時におけるインク非吐出期間Ｔｂ（＝周期Ｔ）には、階調数ｎに等しいか多い回数であるｍ回の非吐出駆動パルスＰｂを印加して、メニスカス２２を挙動させる非吐出駆動を実行する。なお、非吐出期間Ｔｂは、１ドット形成のためのインク吐出期間Ｔａと等しく、周期Ｔに相当する。また、本実施形態では、ｎ＝ｍ＝８としている。
非吐出駆動パルスＰｂの電圧値Ｖｂは、吐出駆動パルスＰａの電圧値Ｖａより低く設定されている。また、非吐出駆動パルスＰｂのパルス幅Ｐｗｂは、吐出駆動パルスＰａのパルス幅Ｐｗａより狭く設定されている。これは、非吐出駆動パルスＰｂの印加によりインクの吐出が起こらないようにするためである。非吐出駆動パルスＰｂの印加によりインクの吐出は起こらないことが条件となるが、メニスカス２２を、吐出時に近い程度に大きく挙動させることができるように設定する。そのために、パルス幅は、０．６Ｐｗａ＜Ｐｗｂ≦Ｐｗａの条件を満たすことがよい。また、電圧値は、０．３＜Ｖｂ／Ｖａ＜０．５の条件を満たすことがよい。
なお、非吐出駆動パルスＰｂの電圧値Ｖｂ、パルス幅Ｐｗｂのうちいずれか一方を吐出駆動パルスＰａと等しくしてもよく、他方によってインクの吐出は起こらないように調整してもよい。
記録動作時におけるインク吐出期間Ｔａ及びインク非吐出期間Ｔｂは、個々のノズルについてのものである。あるノズルがインク吐出期間Ｔａにある時、他のノズルがインク非吐出期間Ｔｂにある場合もあるため、装置全体でインク吐出期間Ｔａ又はインク非吐出期間Ｔｂが定まるものではない。During the ink non-ejection period Tb (=period T) during the recording operation, the head drive unit 25 applies the non-ejection drive pulse Pb m times, which is equal to or greater than the number of gradations n, to drive the meniscus 22. Execute non-discharge drive to make the device behave. Note that the non-ejection period Tb is equal to the ink ejection period Ta for forming one dot, and corresponds to the period T. Further, in this embodiment, n=m=8.
The voltage value Vb of the non-ejection drive pulse Pb is set lower than the voltage value Va of the ejection drive pulse Pa. Further, the pulse width Pwb of the non-ejection drive pulse Pb is set narrower than the pulse width Pwa of the ejection drive pulse Pa. This is to prevent ink from being ejected due to the application of the non-ejection drive pulse Pb. Although the condition is that no ink is ejected due to the application of the non-ejection drive pulse Pb, the setting is made so that the meniscus 22 can be caused to behave largely to the extent that it is close to the time of ejection. Therefore, the pulse width preferably satisfies the condition of 0.6Pwa<Pwb≦Pwa. Further, the voltage value preferably satisfies the condition of 0.3<Vb/Va<0.5.
Note that either one of the voltage value Vb and the pulse width Pwb of the non-ejection drive pulse Pb may be made equal to the ejection drive pulse Pa, or the other may be adjusted so that no ink is ejected.
The ink ejection period Ta and the ink non-ejection period Tb during the recording operation are for each nozzle. When a certain nozzle is in the ink ejection period Ta, another nozzle may be in the ink non-ejection period Tb, so the ink ejection period Ta or the ink non-ejection period Tb is not determined for the entire apparatus.

図５は比較例の駆動パルスを示す。
この比較例では、インク非吐出期間Ｔｂにパルス電圧を印加しない点で異なり、他は図４に示した本実施形態の駆動パルスと同じである。
駆動パルスを印加する前の静的安定状態においては、図６に示すようにメニスカス２２ａはノズル２７のほぼ吐出開口位置で、凹状に保たれる。
連続吐出、特に大液滴（ｎ＝８）の連続吐出があると、メニスカスは徐々にノズル２７の奥に後退する。連続吐出後にインク非吐出期間Ｔｂに入ると、図７に示すようにメニスカス２２ｂはノズル２７の奥にあり、時間の経過とともに揺れは減衰し、インク供給によりメニスカス２２ｂの位置がノズル２７の吐出開口に近づいていく。しかし、インク非吐出期間Ｔｂにパルス電圧を印加しない場合、メニスカス２２ｂの位置や揺れの状態は不安定であり、インク非吐出期間Ｔｂの次のインク吐出期間Ｔａの開始時において様々となる。更に、連続吐出の際に図６の状態と図７の状態を繰り返すことになりメニスカスは不安定な状態となる。これにより、インク非吐出期間Ｔｂ後のインク吐出期間Ｔａにおいて、液滴の不吐出や飛翔曲がりなどにより、吐出が不安定になる可能性が高くなる。FIG. 5 shows drive pulses of a comparative example.
This comparative example differs in that no pulse voltage is applied during the ink non-ejection period Tb, and the rest is the same as the drive pulse of the present embodiment shown in FIG. 4.
In a static stable state before the drive pulse is applied, the meniscus 22a is maintained in a concave shape almost at the ejection opening position of the nozzle 27, as shown in FIG.
When there is continuous ejection, especially continuous ejection of large droplets (n=8), the meniscus gradually retreats to the back of the nozzle 27. When the ink non-discharge period Tb starts after continuous discharge, the meniscus 22b is located at the back of the nozzle 27 as shown in FIG. approaches. However, when no pulse voltage is applied during the ink non-ejection period Tb, the position and swing state of the meniscus 22b are unstable and vary at the start of the ink ejection period Ta following the ink non-ejection period Tb. Furthermore, during continuous ejection, the state shown in FIG. 6 and the state shown in FIG. 7 are repeated, resulting in an unstable state of the meniscus. As a result, during the ink ejection period Ta after the ink non-ejection period Tb, there is a high possibility that ejection becomes unstable due to non-ejection of droplets or flight deflection.

周期Ｔ＝１７５．４μｓ、Ｐｗａ＝１．２ＡＬとして図５の繰り返しパターンで駆動した比較例の実証実験では、液滴速度が７．６ｍ／ｓに達すると、液滴の不吐出の発生が確認できた。
これに対し、同じく周期Ｔ＝１７５．４μｓ、Ｐｗａ＝Ｐｗｂ＝１．２ＡＬとして図４の繰り返しパターンで駆動した本発明例の実証実験では、液滴速度が９．１ｍ／ｓに達しても、液滴の不吐出が発生せず、安定的にインクを吐出できることが確認できた。
本発明例では、インク非吐出期間Ｔｂにおいては、インク吐出期間Ｔａに近似した周波数と振幅のメニスカスの一定した揺れが生じており、インク吐出期間Ｔａと近い挙動で動的に安定している。
したがって、インク非吐出期間Ｔｂの次のインク吐出期間Ｔａは、インク吐出期間Ｔｂの前のインク吐出期間Ｔａに近い条件となって、インクの吐出が連続吐出の場合と同等に安定する。
以上の効果を得るため、ｍ≧ｎとすることがよい。特に、本実施形態のようにｍ＝ｎとすることが好ましい。インク非吐出期間Ｔｂにおいてインク吐出期間Ｔａと同じ回数のメニスカスの揺れを発生させることができ、次のインク吐出期間Ｔａでインクの吐出が安定する。In a demonstration experiment of a comparative example in which the drive was performed in the repeating pattern shown in Figure 5 with period T = 175.4 μs and Pwa = 1.2AL, it was confirmed that droplets did not eject when the droplet velocity reached 7.6 m/s. did it.
On the other hand, in a demonstration experiment of the example of the present invention in which the period T = 175.4 μs and Pwa = Pwb = 1.2 AL were driven in the repeating pattern shown in Fig. 4, even when the droplet velocity reached 9.1 m/s, It was confirmed that the ink could be stably ejected without any non-ejection of droplets.
In the example of the present invention, during the ink non-ejection period Tb, a constant fluctuation of the meniscus occurs with a frequency and amplitude that are close to those of the ink ejection period Ta, and the behavior is dynamically stable and similar to that of the ink ejection period Ta.
Therefore, the ink ejection period Ta following the ink non-ejection period Tb has conditions close to the ink ejection period Ta before the ink ejection period Tb, and the ink ejection is as stable as in the case of continuous ejection.
In order to obtain the above effects, it is preferable that m≧n. In particular, it is preferable that m=n as in this embodiment. During the ink non-ejection period Tb, the meniscus can be shaken the same number of times as the ink ejection period Ta, and the ink ejection becomes stable in the next ink ejection period Ta.

以上の効果を効果的に得るにはさらに以下の条件で実施する。
ノズル２７の吐出開口径をｄｎとして、２０μｍ＜ｄｎ＜５０μｍの条件を満たす。さらに好ましくは特に３０μｍ＜ｄｎ＜５０μｍの条件を満たす。
比重が１より大きいインクを適用する。
１ＡＬ≦Ｐｗａ≦１．４ＡＬの条件を満たす。さらに好ましくは１．２ＡＬ≦Ｐｗａ≦１．４ＡＬを満たす。なお、ＡＬは、圧力室２８の固有振動周期の２分の１である。In order to effectively obtain the above effects, it is further carried out under the following conditions.
The condition of 20 μm<dn<50 μm is satisfied, where the discharge opening diameter of the nozzle 27 is dn. More preferably, the condition of 30 μm<dn<50 μm is satisfied.
Apply an ink with a specific gravity greater than 1.
The condition 1AL≦Pwa≦1.4AL is satisfied. More preferably, 1.2AL≦Pwa≦1.4AL is satisfied. Note that AL is one half of the natural vibration period of the pressure chamber 28.

以上説明したように本実施形態によれば、インクジェット記録装置により安定的に大液滴を吐出することができる。 As described above, according to this embodiment, large droplets can be stably ejected by the inkjet recording apparatus.

本発明は、インクジェット記録装置に利用することができる。 INDUSTRIAL APPLICATION This invention can be utilized for an inkjet recording device.

１ インクジェット記録装置
２０ 記録動作部
２１ インクジェットヘッド
２２ メニスカス
２３ インク液滴
２５ ヘッド駆動部
２７ ノズル
２８ 圧力室
４０ 制御部
Ｐ 駆動パルス電圧
Ｔ 周期1 Inkjet recording device 20 Recording operation section 21 Inkjet head 22 Meniscus 23 Ink droplet 25 Head drive section 27 Nozzle 28 Pressure chamber 40 Control section P Drive pulse voltage T Period

Claims (16)

ノズルに連通する圧力室を有し、前記圧力室内のインクを、前記ノズルから吐出するインクジェットヘッドと、
前記インクジェットヘッドによる記録動作を駆動するヘッド駆動部と、を備え、
前記ヘッド駆動部は、
前記圧力室を膨張、収縮させる駆動パルス電圧であって、前記ノズルからインクを吐出させる吐出駆動パルスと、前記ノズルからインクを吐出させずに前記ノズルに形成されるメニスカスを挙動させる程度の非吐出駆動パルスとを、印加可能にされ、
記録動作時における１ドット形成のためのインク吐出期間には、記録媒体上に着弾させる１ドットに対し階調数ｎを上限とした回数の吐出駆動パルスを印加して、当該回数に応じてドット径を変える吐出駆動を実行し、
記録動作時におけるインク非吐出期間には、前記１ドット形成のためのインク吐出期間と等しい期間に対し、前記階調数ｎに等しい回数であるｍ回の非吐出駆動パルスを印加して、前記メニスカスを挙動させる非吐出駆動を実行するインクジェット記録装置。 an inkjet head having a pressure chamber communicating with a nozzle and ejecting ink in the pressure chamber from the nozzle;
a head drive unit that drives a recording operation by the inkjet head,
The head driving section includes:
A drive pulse voltage that expands and contracts the pressure chamber, and includes an ejection drive pulse that causes ink to be ejected from the nozzle, and a non-ejection drive pulse that causes a meniscus formed in the nozzle to behave without ejecting ink from the nozzle. The drive pulse is enabled to be applied,
During the ink ejection period for forming one dot during the recording operation, ejection drive pulses are applied a number of times with the upper limit of the number of gradations n to each dot that lands on the recording medium, and dots are ejected according to the number of times. Executes a discharge drive that changes the diameter,
During the ink non-ejection period during the recording operation, m times of non-ejection drive pulses, which are equal to the number of gradations n, are applied for a period equal to the ink ejection period for forming one dot. An inkjet recording apparatus that executes non-ejection driving that causes the meniscus to behave. 吐出駆動パルスのパルス幅をＰｗａ、非吐出駆動パルスのパルス幅をＰｗｂとして、０．６Ｐｗａ＜Ｐｗｂ≦Ｐｗａを満たす請求項１に記載のインクジェット記録装置。 The inkjet recording apparatus according to claim 1, wherein 0.6Pwa<Pwb≦Pwa is satisfied, where Pwa is the pulse width of the ejection drive pulse and Pwb is the pulse width of the non-ejection drive pulse. 吐出駆動パルスの電圧値をＶａ、非吐出駆動パルスの電圧値をＶｂとして、０．３＜Ｖｂ／Ｖａ＜０．５を満たす請求項１又は請求項２に記載のインクジェット記録装置。 3. The inkjet recording apparatus according to claim 1, wherein 0.3<Vb/Va<0.5 is satisfied, where Va is the voltage value of the ejection drive pulse and Vb is the voltage value of the non-ejection drive pulse. 前記ノズルの吐出開口径をｄｎとして、２０μｍ＜ｄｎ＜５０μｍを満たす請求項１から請求項３のうちいずれか一に記載のインクジェット記録装置。 The inkjet recording apparatus according to any one of claims 1 to 3 , which satisfies 20 μm<dn<50 μm, where dn is the discharge opening diameter of the nozzle. 前記ノズルの吐出開口径をｄｎとして、３０μｍ＜ｄｎ＜５０μｍを満たす請求項１から請求項３のうちいずれか一に記載のインクジェット記録装置。 The inkjet recording apparatus according to any one of claims 1 to 3 , which satisfies 30 μm<dn<50 μm, where dn is an ejection opening diameter of the nozzle. 前記インクの比重は１より大きい請求項１から請求項５のうちいずれか一に記載のインクジェット記録装置。 The inkjet recording apparatus according to any one of claims 1 to 5 , wherein the ink has a specific gravity greater than 1. 前記吐出駆動パルスのパルス幅をＰｗａ、前記圧力室の固有振動周期の２分の１をＡＬとして、１ＡＬ≦Ｐｗａ≦１．４ＡＬを満たす請求項１から請求項６のうちいずれか一に記載のインクジェット記録装置。 7. The method according to claim 1, wherein 1AL≦Pwa≦1.4AL is satisfied, where Pwa is the pulse width of the ejection drive pulse, and AL is 1/2 of the natural vibration period of the pressure chamber. Inkjet recording device. 前記吐出駆動パルスのパルス幅をＰｗａ、前記圧力室の固有振動周期の２分の１をＡＬとして、１．２ＡＬ≦Ｐｗａ≦１．４ＡＬを満たす請求項１から請求項６のうちいずれか一に記載のインクジェット記録装置。 According to any one of claims 1 to 6 , where 1.2AL≦Pwa≦1.4AL is satisfied, where Pwa is the pulse width of the ejection drive pulse, and AL is 1/2 of the natural vibration period of the pressure chamber. The inkjet recording device described above. ノズルに連通する圧力室を有し、前記圧力室内のインクを、前記ノズルから吐出するインクジェットヘッドによる記録動作を駆動する記録動作駆動方法であって、
前記圧力室を膨張、収縮させる駆動パルス電圧であって、前記ノズルからインクを吐出させる吐出駆動パルスと、前記ノズルからインクを吐出させずに前記ノズルに形成されるメニスカスを挙動させる程度の非吐出駆動パルスとを用い、
記録動作時における１ドット形成のためのインク吐出期間には、記録媒体上に着弾させる１ドットに対し階調数ｎを上限とした回数の吐出駆動パルスを印加して、当該回数に応じてドット径を変える吐出駆動を実行し、
記録動作時におけるインク非吐出期間には、前記１ドット形成のためのインク吐出期間と等しい期間に対し、前記階調数ｎに等しい回数であるｍ回の非吐出駆動パルスを印加して、前記メニスカスを挙動させる非吐出駆動を実行する記録動作駆動方法。 A recording operation driving method for driving a recording operation by an inkjet head having a pressure chamber communicating with a nozzle and ejecting ink in the pressure chamber from the nozzle, the method comprising:
A drive pulse voltage that expands and contracts the pressure chamber, and includes an ejection drive pulse that causes ink to be ejected from the nozzle, and a non-ejection drive pulse that causes a meniscus formed in the nozzle to behave without ejecting ink from the nozzle. Using a driving pulse,
During the ink ejection period for forming one dot during the recording operation, ejection drive pulses are applied a number of times with the upper limit of the number of gradations n to each dot that lands on the recording medium, and dots are ejected according to the number of times. Executes a discharge drive that changes the diameter,
During the ink non-ejection period during the recording operation, m times of non-ejection drive pulses, which are equal to the number of gradations n, are applied for a period equal to the ink ejection period for forming one dot. A recording operation driving method for performing non-ejection driving that causes the meniscus to behave. 吐出駆動パルスのパルス幅をＰｗａ、非吐出駆動パルスのパルス幅をＰｗｂとして、０．６Ｐｗａ＜Ｐｗｂ≦Ｐｗａを満たす請求項９に記載の記録動作駆動方法。 10. The recording operation driving method according to claim 9 , wherein 0.6 Pwa<Pwb≦Pwa is satisfied, where Pwa is the pulse width of the ejection drive pulse and Pwb is the pulse width of the non-ejection drive pulse. 吐出駆動パルスの電圧値をＶａ、非吐出駆動パルスの電圧値をＶｂとして、０．３＜Ｖｂ／Ｖａ＜０．５を満たす請求項９又は請求項１０に記載の記録動作駆動方法。 11. The recording operation driving method according to claim 9 , wherein 0.3<Vb/Va<0.5 is satisfied, where Va is the voltage value of the ejection drive pulse and Vb is the voltage value of the non-ejection drive pulse. 前記ノズルの吐出開口径をｄｎとして、２０μｍ＜ｄｎ＜５０μｍを満たす請求項９から請求項１１のうちいずれか一に記載の記録動作駆動方法。 The recording operation driving method according to any one of claims 9 to 11 , which satisfies 20 μm<dn<50 μm, where dn is the discharge opening diameter of the nozzle. 前記ノズルの吐出開口径をｄｎとして、３０μｍ＜ｄｎ＜５０μｍを満たす請求項９から請求項１１のうちいずれか一に記載の記録動作駆動方法。 The recording operation driving method according to any one of claims 9 to 11 , which satisfies 30 μm<dn<50 μm, where dn is the discharge opening diameter of the nozzle. 前記インクの比重は１より大きい請求項９から請求項１３のうちいずれか一に記載の記録動作駆動方法。 14. The recording operation driving method according to claim 9 , wherein the specific gravity of the ink is greater than 1. 前記吐出駆動パルスのパルス幅をＰｗａ、前記圧力室の固有振動周期の２分の１をＡＬとして、１ＡＬ≦Ｐｗａ≦１．４ＡＬを満たす請求項９から請求項１４のうちいずれか一に記載の記録動作駆動方法。 15. The method according to claim 9 , wherein 1AL≦Pwa≦1.4AL is satisfied, where Pwa is the pulse width of the ejection drive pulse, and AL is half the natural vibration period of the pressure chamber. Recording operation driving method. 前記吐出駆動パルスのパルス幅をＰｗａ、前記圧力室の固有振動周期の２分の１をＡＬとして、１．２ＡＬ≦Ｐｗａ≦１．４ＡＬを満たす請求項９から請求項１４のうちいずれか一に記載の記録動作駆動方法。 Any one of claims 9 to 14 that satisfies 1.2AL≦Pwa≦1.4AL, where Pwa is the pulse width of the ejection drive pulse, and AL is half the natural vibration period of the pressure chamber. The recording operation driving method described.
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JP2004082718A (en) 2002-06-27 2004-03-18 Canon Inc Inkjet recorder and inkjet recording method
JP2013240947A (en) 2012-05-22 2013-12-05 Kyocera Document Solutions Inc Inkjet recording device
WO2014037929A1 (en) 2012-09-09 2014-03-13 Hewlett-Packard Industrial Printing Ltd. Maintenance of inkjet print head device
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