WO2021149217A1 - Ink-jet recording device and recording operation driving method - Google Patents

Ink-jet recording device and recording operation driving method Download PDF

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Publication number
WO2021149217A1
WO2021149217A1 PCT/JP2020/002296 JP2020002296W WO2021149217A1 WO 2021149217 A1 WO2021149217 A1 WO 2021149217A1 JP 2020002296 W JP2020002296 W JP 2020002296W WO 2021149217 A1 WO2021149217 A1 WO 2021149217A1
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drive
drive pulse
pressure chamber
pulse
discharge drive
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PCT/JP2020/002296
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French (fr)
Japanese (ja)
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健児 馬渡
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コニカミノルタ株式会社
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Priority to JP2021572215A priority Critical patent/JPWO2021149217A1/ja
Priority to PCT/JP2020/002296 priority patent/WO2021149217A1/en
Publication of WO2021149217A1 publication Critical patent/WO2021149217A1/en

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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
    • 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

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  • the present invention relates to an inkjet recording device and a recording operation driving method.
  • a multi-drive system has been realized in which a multi-drive signal including a plurality of drive pulses is applied to an inkjet head in order to form one dot of different sizes on a recording medium, and droplets are continuously ejected. One droplet is ejected by applying one pulse.
  • the size of one dot on the recording medium can be made different by selecting the number of pulses applied to form one dot.
  • the pressure chamber contraction element of the final pulse in the waveform element including a plurality of drive pulses, is divided into two stages, and the slope time of the contraction element on the rear side is contraction on the front side. It is longer than the slope time of the element.
  • the slope time of the pressure chamber contraction element of the final pulse in the waveform element including a plurality of drive pulses, is set to 1/4 or more of the natural vibration cycle of the pressure chamber.
  • the invention described in Patent Document 3 in a waveform element including at least two pulses including a pressure chamber expansion element and a contraction element, from the end point of the contraction element of the first pulse to the start point of the expansion element of the second pulse. Is an integral multiple of the natural vibration period of the pressure chamber.
  • Japanese Unexamined Patent Publication No. 2012-192710 Japanese Unexamined Patent Publication No. 2012-250477 Japanese Unexamined Patent Publication No. 2014-133350
  • the contraction element of the final pulse is set to a specific waveform in order to reduce satellites, but such a method complicates the waveform and makes it difficult to adjust each ink. As a result, the voltage required for the contraction element becomes large, and the drive efficiency deteriorates.
  • the pause period between drive pulses is set to an integral multiple of the natural vibration period of the pressure chamber in order to reduce satellites, but such a method lengthens the sub-drop period. Therefore, the waveform length of the entire drive waveform becomes long, and the drive frequency becomes slow.
  • the present invention has been made in view of the above problems in the prior art, and an object of the present invention is to reduce the generation of satellite droplets while enabling multi-drive at high speed and high drive efficiency in inkjet recording.
  • One aspect of the present invention includes an inkjet head having a pressure chamber communicating with a nozzle and ejecting ink communicating with the pressure chamber from the nozzle.
  • a head drive unit that drives a recording operation by the inkjet head is provided.
  • the head drive unit A drive pulse voltage for expanding and contracting the pressure chamber, which is a discharge drive pulse for ejecting one droplet of ink from the nozzle, is performed a plurality of times in one drive cycle for forming one dot on a recording medium during a recording operation.
  • the head drive unit is an inkjet recording device that makes the time between the final discharge drive pulse in the one drive cycle and the discharge drive pulse immediately before the final discharge drive pulse longer than the time between the other discharge drive pulses. be.
  • Another aspect of the present invention is a recording operation driving method that has a pressure chamber communicating with a nozzle and drives a recording operation by an inkjet head that ejects ink communicating with the pressure chamber from the nozzle.
  • a drive pulse voltage for expanding and contracting the pressure chamber which is a discharge drive pulse for ejecting one droplet of ink from the nozzle, is performed a plurality of times in one drive cycle for forming one dot on a recording medium during a recording operation.
  • This is a recording operation driving method in which the time between the final discharge drive pulse in the one drive cycle and the discharge drive pulse immediately before the final discharge drive pulse is made longer than the time between the other discharge drive pulses.
  • the inkjet recording apparatus by lengthening the pause time before the final discharge drive pulse, the negative pressure immediately before the contraction element of the final discharge drive pulse is applied is suppressed, and the satellite droplets are suppressed. It is possible to reduce the number of satellite droplets, and it is possible to avoid complication of the waveform and lengthening of the entire sub-drop cycle in order to reduce satellite droplets. Occurrence can be reduced.
  • the inkjet recording device 1 includes a transport unit 10, a recording operation unit 20, a cleaning unit 30, a control unit 40, a storage unit 50, a communication unit 70, an operation reception unit 81, a display unit 82, and a power supply unit. 90 and the like are provided.
  • the transport unit 10 moves the recording medium on which the image is recorded so as to face the recording range of the recording operation unit 20.
  • the transport unit 10 includes, for example, a transport motor 14 that pulls out a long recording medium rolled up in a roll shape at a predetermined speed.
  • the recording medium is, for example, cloth, but may be another material such as paper.
  • the recording operation unit 20 performs an operation of ejecting ink onto a recording medium and recording an image.
  • the recording operation unit 20 is a piezoelectric element that deforms a nozzle 27 in which a large number of inks are arranged in a predetermined pattern to discharge ink and an ink flow path (pressure chamber) that supplies ink to the nozzle 27 to give pressure fluctuation to the ink.
  • It includes an inkjet head 21 having 26, a head drive unit 25 that outputs a drive pulse voltage that deforms each piezoelectric element 26, and the like.
  • the side wall 29 of the pressure chamber 28 communicating with the nozzle 27 is deformed and formed in the vicinity of the discharge opening of the nozzle 27 as shown in FIG.
  • the meniscus 22 is shaken to separate the ink droplets (main droplets) 23 from the meniscus 22 and eject the ink droplets (main droplets) 23.
  • the satellite drop 24 may be ejected after the main drop 23.
  • the cleaning unit 30 includes a wiping member 32 for removing ink and solidified substances thereof adhering to the nozzle surface where the openings of the nozzle 27 are arranged, a drive unit 31 for operating the wiping member 32, and the like.
  • the wiping member 32 is not particularly limited, but is, for example, a non-woven fabric that sucks ink, a resin member on a blade that scrapes solids, and the like.
  • the control unit 40 is a processor that controls the overall operation of the inkjet recording device 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 the CPU 41 with a working memory space and stores temporary data.
  • the storage unit 50 stores image data to be recorded and its processing data, and stores other setting data, programs, and the like.
  • the image data may be stored in, for example, a DRAM capable of temporarily storing a large amount of data and outputting it at high speed.
  • the setting data, the program, and the like are stored in a non-volatile memory such as a flash memory that can be stored even when the power supply to the inkjet recording device 1 is stopped, and / or in an HDD (Hard Disk Drive) or the like.
  • the communication unit 70 controls data transmission / reception with an external device according to a predetermined communication standard, for example, TCP / IP (Transmission Control Protocol / Internet Protocol).
  • the communication unit 70 may be connected to a LAN (Local Area Network) or the like and can be connected to the external Internet via a router or the like, or may be directly connected to a peripheral device via a USB cable connected to a USB terminal. It may be.
  • the power supply unit 90 supplies power to the inkjet recording device 1 from the power supply.
  • the head drive unit 25 applies a drive pulse voltage P that expands and contracts the pressure chamber 28 to the piezoelectric element 26.
  • FIG. 4 shows a drive waveform within one drive cycle according to the embodiment of the present invention.
  • One drive cycle corresponds to a drive period for forming one dot on the recording medium during the recording operation, and multi-drive is executed in such a cycle.
  • the head drive unit 25 applies drive pulses a plurality of times in one drive cycle. Although 4 pulses are shown for the sake of simplicity, it is needless to say that a larger number of pulses may be selected.
  • the head drive unit 25 makes the time T1 between the final discharge drive pulse P1 in one drive cycle and the discharge drive pulse P2 immediately before the final discharge drive pulse P1 longer than the times T2 and T3 between the other discharge drive pulses.
  • the head drive unit 25 sets the time T11 between the start of the final discharge drive pulse P1 and the start of the discharge drive pulse P2 immediately before the start of the final discharge drive pulse P1 from 1.9 times to 2.1 times the natural vibration cycle of the pressure chamber 28.
  • the range is.
  • the natural vibration period of the pressure chamber 28 is Tc
  • T11 is in the range of 1.9 Tc to 2.1 Tc.
  • T11 2Tc.
  • the time T1 can be made longer than the time T2 and T3.
  • the pulse immediately before P1 can maximize the drive efficiency by utilizing the resonance of the pressure chamber.
  • the range from the contraction element start point to the expansion element start point of each pulse can be set to 0.5Tc-0.7Tc as shown in FIG. As a result, it can be driven by a homogeneous and simple pulse waveform, and multi-drive with high drive efficiency becomes possible.
  • by adjusting the drive voltage of each pulse it is possible to adjust so that the speeds of the multi-dot droplets at each gradation are the same.
  • FIG. 5 shows a drive waveform within one drive cycle according to a comparative example. This corresponds to the configuration in which T11 is set to 1 Tc in the embodiment of the present invention (FIG. 4), and the others are common to the embodiment of the present invention (FIG. 4).
  • the time change of the pressure of the pressure chamber 28 at the time of driving the head according to the above-mentioned Example (FIG. 4) and Comparative Example (FIG. 5) of the present invention was investigated. The result is shown in FIG.
  • FIG. 6 in the embodiment of the present invention, the pressure fluctuation is suppressed to be smaller than that of the comparative example.
  • the time axis of FIG. 6 shows the time points t1A and t1B immediately before the final pulse.
  • the time point t1A is a time point immediately before the contraction element of the final discharge drive pulse P1 is applied in this embodiment, and is common to t1A shown in FIG.
  • the time point t1B is a time point immediately before the contraction element of the final discharge drive pulse P1B is applied in the comparative example, and is common to t1B shown in FIG. Therefore, the difference between the time point t1A and the time point t1B is 1 Tc.
  • the wave w1 having the maximum amplitude was generated by the final discharge drive pulse P1B applied immediately after the time point t1B.
  • the wave w2 having the maximum amplitude was generated by the final discharge drive pulse P1 applied immediately after the time point t1A, but it was suppressed to be smaller than the wave w1 having the maximum amplitude in the comparative example. ..
  • the period between t1B and t1A in FIG. 6 corresponds to the rest period T1, and it is considered that the wave w3 in this period is also suppressed to be smaller than that of the comparative example.
  • FIG. 7 shows the result of examining the relationship between the length of the final period T11 and the pressure of the pressure chamber 28 at the time point t1 immediately before the final pulse.
  • the period T12 before the final is 1 Tc, which is common.
  • the negative pressure is relatively weak.
  • the limit pressure Ps at which satellite droplets are discharged was investigated and shown in FIG. In FIG. 7, below the limit pressure Ps, the negative pressure in the pressure chamber 28 increases, and satellite droplets are generated with high probability. Above the critical pressure Ps, the negative pressure in the pressure chamber 28 is suppressed, and the generation of satellite droplets is reduced. Therefore, by setting the final period T11 in the range of 1.9 Tc to 2.1 Tc as described above, the generation of satellite droplets can be reduced.
  • the present invention can be used for an inkjet recording device.
  • Inkjet recording device 10 Conveying unit 20 Recording operation unit 21 Inkjet head 22 Meniscus 23 Ink droplets (main droplets) 24 Satellite drops 25 Head drive unit 26 Piezoelectric element 27 Nozzle 28 Pressure chamber 29 Side wall 30 Cleaning unit 40 Control unit 50 Storage unit 70 Communication unit 90 Power supply unit

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

Provided is an ink-jet recording device in which a head driving unit for driving a recording operation of an ink-jet head is configured to be able to carry out multi-driving whereby a discharge driving pulse for causing a droplet of ink to be discharged from a nozzle is applied for a plurality of times during one driving cycle for forming one dot on a recording medium during the recording operation. Furthermore, during the multi-driving, the head driving unit makes a time period T1 between the last discharge driving pulse P1 and an immediately preceding discharge driving pulse P2 in one driving cycle longer than time periods T2, T3 between other discharge driving pulses.

Description

インクジェット記録装置及び記録動作駆動方法Inkjet recording device and recording operation drive method
　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 recording device and a recording 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。
　記録媒体上に異なる大きさの１ドットを形成するために複数の駆動パルスを含むマルチ駆動信号をインクジェットヘッドに印加して、液滴を連続的に吐出するマルチ駆動方式が実現されている。１パルスの印加により１液滴が吐出される。マルチ駆動方式によれば、１ドットを形成するために印加するパルス数を選択することにより、記録媒体上の１ドットの大きさを異ならせることができる。
　一方、特許文献１－３等に記載されるように、ノズルから吐出された主滴の後にサテライト滴が飛翔し、主滴と異なる位置に着弾することで画質が低下することが問題となっている。
　マルチ駆動において、高速駆動を行うために効率的で単純なパルス波形を用いるとサテライト滴が吐出されやすく、高画質が要求される用途では受け入れられない。 Conventionally, there is known an inkjet device that circulates ink through an inkjet head and ejects ink from a nozzle of the inkjet head.
A multi-drive system has been realized in which a multi-drive signal including a plurality of drive pulses is applied to an inkjet head in order to form one dot of different sizes on a recording medium, and droplets are continuously ejected. One droplet is ejected by applying one pulse. According to the multi-drive system, the size of one dot on the recording medium can be made different by selecting the number of pulses applied to form one dot.
On the other hand, as described in Patent Documents 1-3 and the like, there is a problem that satellite droplets fly after the main droplets ejected from the nozzle and land at a position different from the main droplets, resulting in deterioration of image quality. There is.
In multi-drive, if an efficient and simple pulse waveform is used for high-speed drive, satellite droplets are likely to be ejected, which is unacceptable in applications requiring high image quality.
　特許文献１に記載の発明にあっては、複数の駆動パルスが含まれる波形要素において、最終パルスの圧力室収縮要素が２段階に分かれており、後側の収縮要素のスロープ時間が前側の収縮要素のスロープ時間よりも長くされる。
　特許文献２に記載の発明にあっては、複数の駆動パルスが含まれる波形要素において、最終パルスの圧力室収縮要素のスロープ時間が圧力室の固有振動周期の１/４以上とされる。
　特許文献３に記載の発明にあっては、圧力室膨張要素と収縮要素を含む少なくとも２つのパルスが含まれる波形要素において、第１パルスの収縮要素の終点から第２パルスの膨張要素の始点までの時間が圧力室の固有振動周期の整数倍とされる。 In the invention described in Patent Document 1, in the waveform element including a plurality of drive pulses, the pressure chamber contraction element of the final pulse is divided into two stages, and the slope time of the contraction element on the rear side is contraction on the front side. It is longer than the slope time of the element.
In the invention described in Patent Document 2, in the waveform element including a plurality of drive pulses, the slope time of the pressure chamber contraction element of the final pulse is set to 1/4 or more of the natural vibration cycle of the pressure chamber.
In the invention described in Patent Document 3, in a waveform element including at least two pulses including a pressure chamber expansion element and a contraction element, from the end point of the contraction element of the first pulse to the start point of the expansion element of the second pulse. Is an integral multiple of the natural vibration period of the pressure chamber.
特開２０１２-１９２７１０号公報Japanese Unexamined Patent Publication No. 2012-192710 特開２０１２-２５０４７７号公報Japanese Unexamined Patent Publication No. 2012-250477 特開２０１４-１３３３５０号公報Japanese Unexamined Patent Publication No. 2014-133350
　しかしながら、特許文献１，２に記載の発明にあっては、サテライト低減のために最終パルスの収縮要素を特定の波形とするが、このような方法では波形が複雑になりインク毎の調整が難しくなってしまい、収縮要素に必要な電圧が大きくなるため駆動効率が悪化する。
　また、特許文献３に記載の発明にあっては、サテライト低減のために駆動パルス間の休止期間を圧力室の固有振動周期の整数倍とするが、このような方法ではサブドロップ周期が長くなるため駆動波形全体の波形長が長くなってしまい、駆動周波数が遅くなってしまう。 However, in the inventions described in Patent Documents 1 and 2, the contraction element of the final pulse is set to a specific waveform in order to reduce satellites, but such a method complicates the waveform and makes it difficult to adjust each ink. As a result, the voltage required for the contraction element becomes large, and the drive efficiency deteriorates.
Further, in the invention described in Patent Document 3, the pause period between drive pulses is set to an integral multiple of the natural vibration period of the pressure chamber in order to reduce satellites, but such a method lengthens the sub-drop period. Therefore, the waveform length of the entire drive waveform becomes long, and the drive frequency becomes slow.
　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において、高速、高駆動効率でのマルチ駆動を可能にしつつ、サテライト滴の発生を低減することを課題とする。 The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to reduce the generation of satellite droplets while enabling multi-drive at high speed and high drive efficiency in inkjet recording.
　本発明の一態様は、ノズルに連通する圧力室を有し、この圧力室に連通するインクを、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１液滴吐出させる吐出駆動パルスを、記録動作時における記録媒体上の１ドット形成のための１駆動周期において複数回印加するマルチ駆動を実行可能にされ、
前記ヘッド駆動部は前記マルチ駆動において、前記１駆動周期内の最終の吐出駆動パルスとその直前の吐出駆動パルスとの間の時間を、その他の吐出駆動パルス間の時間より長く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 communicating with the pressure chamber from the nozzle.
A head drive unit that drives a recording operation by the inkjet head is provided.
The head drive unit
A drive pulse voltage for expanding and contracting the pressure chamber, which is a discharge drive pulse for ejecting one droplet of ink from the nozzle, is performed a plurality of times in one drive cycle for forming one dot on a recording medium during a recording operation. Enables multi-drive to apply,
In the multi-drive, the head drive unit is an inkjet recording device that makes the time between the final discharge drive pulse in the one drive cycle and the discharge drive pulse immediately before the final discharge drive pulse longer than the time between the other discharge drive pulses. be.
　本発明の他の一態様は、ノズルに連通する圧力室を有し、この圧力室に連通するインクを、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１液滴吐出させる吐出駆動パルスを、記録動作時における記録媒体上の１ドット形成のための１駆動周期において複数回印加するマルチ駆動を実行するにあたり、
前記１駆動周期内の最終の吐出駆動パルスとその直前の吐出駆動パルスとの間の時間を、その他の吐出駆動パルス間の時間より長くする記録動作駆動方法である。 Another aspect of the present invention is a recording operation driving method that has a pressure chamber communicating with a nozzle and drives a recording operation by an inkjet head that ejects ink communicating with the pressure chamber from the nozzle.
A drive pulse voltage for expanding and contracting the pressure chamber, which is a discharge drive pulse for ejecting one droplet of ink from the nozzle, is performed a plurality of times in one drive cycle for forming one dot on a recording medium during a recording operation. In executing the applied multi-drive
This is a recording operation driving method in which the time between the final discharge drive pulse in the one drive cycle and the discharge drive pulse immediately before the final discharge drive pulse is made longer than the time between the other discharge drive pulses.
　本発明によれば、インクジェット記録装置において、最終の吐出駆動パルスの前の休止時間を長くすることで、当該最終の吐出駆動パルスの収縮要素が印加される直前の負圧が抑制されてサテライト滴を低減することができ、サテライト滴を低減するために波形の複雑化も、全体のサブドロップ周期の長期化も避けられるから、高速、高駆動効率でのマルチ駆動を可能にしつつ、サテライト滴の発生を低減することができる。 According to the present invention, in the inkjet recording apparatus, by lengthening the pause time before the final discharge drive pulse, the negative pressure immediately before the contraction element of the final discharge drive pulse is applied is suppressed, and the satellite droplets are suppressed. It is possible to reduce the number of satellite droplets, and it is possible to avoid complication of the waveform and lengthening of the entire sub-drop cycle in order to reduce satellite droplets. Occurrence can be reduced.
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。It is a block diagram which shows the functional structure of the inkjet recording apparatus which concerns on one Embodiment of this 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。It is a schematic diagram of the pressure chamber and the nozzle seen in the axial direction of the nozzle, and shows the change of the pressure chamber corresponding to the 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。It is a schematic diagram which shows the operation of the ink droplet ejected from a nozzle. 本発明の実施例に係る１駆動周期内の駆動波形を示す駆動波形図である。It is a drive waveform diagram which shows the drive waveform in one drive cycle which concerns on embodiment of this invention. 比較例に係る１駆動周期内の駆動波形を示す駆動波形図である。It is a drive waveform diagram which shows the drive waveform in one drive cycle which concerns on a comparative example. 本発明の実施例と比較例によるヘッド駆動時の圧力室の圧力の時間変化を示すグラフである。It is a graph which shows the time change of the pressure of the pressure chamber at the time of driving a head by an Example of this invention and a comparative example. 最終周期の長さと最終パルス直前時点での圧力室の圧力との関係を示すグラフである。It is a graph which shows the relationship between the length of a final cycle and the pressure of a pressure chamber just before the final pulse.
　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 an embodiment of the present invention and does not 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 device 1 includes a transport unit 10, a recording operation unit 20, a cleaning unit 30, a control unit 40, a storage unit 50, a communication unit 70, an operation reception unit 81, a display unit 82, and a power supply unit. 90 and the like are provided.
　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 transport unit 10 moves the recording medium on which the image is recorded so as to face the recording range of the recording operation unit 20. The transport unit 10 includes, for example, a transport motor 14 that pulls out a long recording medium rolled up in a roll shape at a predetermined speed. The recording medium is, for example, cloth, but may be another material 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（主滴）２３をメニスカス２２から分離させて吐出する。主滴２３の後にサテライト滴２４が吐出されることがある。 The recording operation unit 20 performs an operation of ejecting ink onto a recording medium and recording an image. The recording operation unit 20 is a piezoelectric element that deforms a nozzle 27 in which a large number of inks are arranged in a predetermined pattern to discharge ink and an ink flow path (pressure chamber) that supplies ink to the nozzle 27 to give pressure fluctuation to the ink. It includes an inkjet head 21 having 26, a head drive unit 25 that outputs a drive pulse voltage that deforms each piezoelectric element 26, and the like.
By applying the drive 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 formed in the vicinity of the discharge opening of the nozzle 27 as shown in FIG. The meniscus 22 is shaken to separate the ink droplets (main droplets) 23 from the meniscus 22 and eject the ink droplets (main droplets) 23. The satellite drop 24 may be ejected after the main drop 23.
　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 for removing ink and solidified substances thereof adhering to the nozzle surface where the openings of the nozzle 27 are arranged, a drive unit 31 for operating the wiping member 32, and the like. The wiping member 32 is not particularly limited, but is, for example, a non-woven fabric that sucks ink, a resin member on a blade that scrapes solids, and the like.
　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 controls the overall operation of the inkjet recording device 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 the CPU 41 with a working memory space 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 processing data, and stores other setting data, programs, and the like. The image data may be stored in, for example, a DRAM capable of temporarily storing a large amount of data and outputting it at high speed. Further, the setting data, the program, and the like are stored in a non-volatile memory such as a flash memory that can be stored even when the power supply to the inkjet recording device 1 is stopped, and / or in an HDD (Hard Disk Drive) or the like.
　通信部７０は、所定の通信規格例えば、ＴＣＰ／ＩＰ（Transmission Control Protocol / Internet Protocol）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 / reception with an external device according to a predetermined communication standard, for example, TCP / IP (Transmission Control Protocol / Internet Protocol). The communication unit 70 may be connected to a LAN (Local Area Network) or the like and can be connected to the external Internet via a router or the like, or may be directly connected to a peripheral device via a USB cable connected to a USB terminal. It may be.
The power supply unit 90 supplies power to the inkjet recording device 1 from the power supply.
　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。
　図４に、本発明の実施例に係る１駆動周期内の駆動波形を示す。１駆動周期は、記録動作時における記録媒体上の１ドット形成のための駆動期間に相当し、かかる周期でマルチ駆動を実行していく。
　図４に示すようにヘッド駆動部２５は、１駆動周期において複数回に亘り駆動パルスを印加する。なお、説明の簡単のため４パルスを図示するが、さらに多くのパルス数まで選択できるように実施してもよいことは勿論である。
　ヘッド駆動部２５は、１駆動周期内の最終の吐出駆動パルスＰ１とその直前の吐出駆動パルスＰ２との間の時間Ｔ１を、その他の吐出駆動パルス間の時間Ｔ２，Ｔ３より長くする。その他の吐出駆動パルス間の時間とは、最終直前の吐出駆動パルスＰ２までの時間において、時間軸上で隣り合うパルス間の時間である。なお、Ｔ２＝Ｔ３として実施する。
　最終の吐出駆動パルスＰ１の前の休止時間Ｔ１を長くすることで、最終の吐出駆動パルスＰ１の収縮要素（立ち上がり期間）が印加される直前（ｔ１Ａ時点）の負圧が抑制されてサテライト滴を低減することができる。 Next, the driving of the recording operation will be described.
The head drive unit 25 applies a drive pulse voltage P that expands and contracts the pressure chamber 28 to the piezoelectric element 26.
FIG. 4 shows a drive waveform within one drive cycle according to the embodiment of the present invention. One drive cycle corresponds to a drive period for forming one dot on the recording medium during the recording operation, and multi-drive is executed in such a cycle.
As shown in FIG. 4, the head drive unit 25 applies drive pulses a plurality of times in one drive cycle. Although 4 pulses are shown for the sake of simplicity, it is needless to say that a larger number of pulses may be selected.
The head drive unit 25 makes the time T1 between the final discharge drive pulse P1 in one drive cycle and the discharge drive pulse P2 immediately before the final discharge drive pulse P1 longer than the times T2 and T3 between the other discharge drive pulses. The time between the other discharge drive pulses is the time between adjacent pulses on the time axis in the time until the discharge drive pulse P2 immediately before the final. It should be noted that T2 = T3.
By lengthening the pause time T1 before the final discharge drive pulse P1, the negative pressure immediately before the contraction element (rising period) of the final discharge drive pulse P1 is applied (at the time of t1A) is suppressed, and satellite droplets are formed. It can be reduced.
　また、ヘッド駆動部２５は、最終の吐出駆動パルスＰ１の開始時とその直前の吐出駆動パルスＰ２の開始時の間の時間Ｔ１１を、圧力室２８の固有振動周期の１．９倍から２．１倍の範囲とする。圧力室２８の固有振動周期をＴｃとして、Ｔ１１を１．９Ｔｃから２．１Ｔｃの範囲とする。本実施形態では、Ｔ１１＝２Ｔｃとする。
　これにより、時間Ｔ１を時間Ｔ２，Ｔ３より長くすることができる。
　一方、ヘッド駆動部２５は、最終の吐出駆動パルスＰ１の直前の吐出駆動パルスＰ２までのパルス周期Ｔ１２を、圧力室２８の固有振動周期Ｔｃの１．０倍とする、すなわち、Ｔ１２＝１Ｔｃとする。これにより、Ｐ１の直前までのパルスは圧力室の共振を利用して駆動効率を最大限まで高めることが可能となる。
　サテライト滴を低減するために、全体のサブドロップ周期を長期化する、すなわち、Ｔ１１＝Ｔ１２＝２Ｔｃとすることは、波形の全長が長くなり高速駆動が妨げられることとなるが、これは避けられる。Ｔ１１＝２Ｔｃとする一方で、Ｔ１２＝１Ｔｃとすることで、高速なマルチ駆動が可能になる。
　また、各パルスの収縮要素開始点から膨張要素開始点までを、図４に示すように０．５Ｔｃ－０．７Ｔｃとすることができる。これにより、均質で単純なパルス波形により駆動でき、高駆動効率でのマルチ駆動が可能になる。
　また、各パルスの駆動電圧を調整する事により、各階調でのマルチドット液滴の速度が揃うよう調整する事が可能になる。 Further, the head drive unit 25 sets the time T11 between the start of the final discharge drive pulse P1 and the start of the discharge drive pulse P2 immediately before the start of the final discharge drive pulse P1 from 1.9 times to 2.1 times the natural vibration cycle of the pressure chamber 28. The range is. The natural vibration period of the pressure chamber 28 is Tc, and T11 is in the range of 1.9 Tc to 2.1 Tc. In this embodiment, T11 = 2Tc.
Thereby, the time T1 can be made longer than the time T2 and T3.
On the other hand, the head drive unit 25 sets the pulse period T12 up to the discharge drive pulse P2 immediately before the final discharge drive pulse P1 to 1.0 times the natural vibration period Tc of the pressure chamber 28, that is, T12 = 1Tc. do. As a result, the pulse immediately before P1 can maximize the drive efficiency by utilizing the resonance of the pressure chamber.
Prolonging the entire sub-drop period in order to reduce satellite droplets, that is, setting T11 = T12 = 2Tc increases the overall length of the waveform and hinders high-speed driving, but this can be avoided. .. By setting T11 = 2Tc and T12 = 1Tc, high-speed multi-drive becomes possible.
Further, the range from the contraction element start point to the expansion element start point of each pulse can be set to 0.5Tc-0.7Tc as shown in FIG. As a result, it can be driven by a homogeneous and simple pulse waveform, and multi-drive with high drive efficiency becomes possible.
Further, by adjusting the drive voltage of each pulse, it is possible to adjust so that the speeds of the multi-dot droplets at each gradation are the same.
　図５に、比較例に係る１駆動周期内の駆動波形を示す。本発明の実施例（図４）におけるＴ１１を１Ｔｃとした構成に相当し、その他は本発明の実施例（図４）と共通である。
　以上の本発明の実施例（図４）と比較例（図５）によるヘッド駆動時の圧力室２８の圧力の時間変化を調べた。図６にその結果を示す。
　図６に示すように、比較例に対して本発明の実施例は、圧力変動が小さく抑えられている。図６の時間軸に最終パルス直前の時点ｔ１Ａ，ｔ１Ｂを示している。時点ｔ１Ａは、本実施例において最終の吐出駆動パルスＰ１の収縮要素が印加される直前時点であり、図４に示したｔ１Ａと共通である。時点ｔ１Ｂは、比較例において最終の吐出駆動パルスＰ１Ｂの収縮要素が印加される直前時点であり、図５に示したｔ１Ｂと共通である。したがって、時点ｔ１Ａと時点ｔ１Ｂの差が１Ｔｃである。
　比較例においては、時点ｔ１Ｂ直後に印加されている最終の吐出駆動パルスＰ１Ｂにより最大振幅の波ｗ１が生じた。
　これに対し本発明の実施例においては、時点ｔ１Ａ直後に印加されている最終の吐出駆動パルスＰ１により最大振幅の波ｗ２が生じたが、比較例の最大振幅の波ｗ１より、小さく抑えられた。
　本発明の実施例では、図６におけるｔ１Ｂ―ｔ１Ａ間が休止期間Ｔ１に相当しており、この期間の波ｗ３も含めて比較例に対し小さく抑えられたことによると考えられる。 FIG. 5 shows a drive waveform within one drive cycle according to a comparative example. This corresponds to the configuration in which T11 is set to 1 Tc in the embodiment of the present invention (FIG. 4), and the others are common to the embodiment of the present invention (FIG. 4).
The time change of the pressure of the pressure chamber 28 at the time of driving the head according to the above-mentioned Example (FIG. 4) and Comparative Example (FIG. 5) of the present invention was investigated. The result is shown in FIG.
As shown in FIG. 6, in the embodiment of the present invention, the pressure fluctuation is suppressed to be smaller than that of the comparative example. The time axis of FIG. 6 shows the time points t1A and t1B immediately before the final pulse. The time point t1A is a time point immediately before the contraction element of the final discharge drive pulse P1 is applied in this embodiment, and is common to t1A shown in FIG. The time point t1B is a time point immediately before the contraction element of the final discharge drive pulse P1B is applied in the comparative example, and is common to t1B shown in FIG. Therefore, the difference between the time point t1A and the time point t1B is 1 Tc.
In the comparative example, the wave w1 having the maximum amplitude was generated by the final discharge drive pulse P1B applied immediately after the time point t1B.
On the other hand, in the embodiment of the present invention, the wave w2 having the maximum amplitude was generated by the final discharge drive pulse P1 applied immediately after the time point t1A, but it was suppressed to be smaller than the wave w1 having the maximum amplitude in the comparative example. ..
In the examples of the present invention, the period between t1B and t1A in FIG. 6 corresponds to the rest period T1, and it is considered that the wave w3 in this period is also suppressed to be smaller than that of the comparative example.
　上記の時間Ｔ１１を最終周期Ｔ１１、時間Ｔ１２を最終以前の周期Ｔ１２とする。
　図７は、最終周期Ｔ１１の長さと、最終パルス直前の時点ｔ１での圧力室２８の圧力との関係を調べた結果を示す。
　本発明実施例と比較例とで最終以前の周期Ｔ１２は１Ｔｃであり共通である。
　最終周期Ｔ１１＝１Ｔｃとするとき、図５の比較例に相当する。最終周期Ｔ１１＝２Ｔｃとするとき、図４の本発明実施例に相当する。
　図７に示すように、比較例のＴ１１＝１Ｔｃ付近では、比較的負圧が高まっている。これに対し、本発明実施例のＴ１１＝２Ｔｃ付近では、比較的負圧が弱まっている。
　サテライト滴が吐出される限界圧力Ｐｓを調べ、図７に示した。
　図７において、限界圧力Ｐｓより下は、圧力室２８の負圧が高まっており、サテライト滴が高確率で生じる。限界圧力Ｐｓより上では、圧力室２８の負圧が抑えられており、サテライト滴の発生が低減する。
　したがって、上述のように最終周期Ｔ１１を１．９Ｔｃから２．１Ｔｃの範囲とすることで、サテライト滴の発生を低減することができる。 Let the time T11 be the final cycle T11 and the time T12 be the cycle T12 before the final.
FIG. 7 shows the result of examining the relationship between the length of the final period T11 and the pressure of the pressure chamber 28 at the time point t1 immediately before the final pulse.
In the examples of the present invention and the comparative examples, the period T12 before the final is 1 Tc, which is common.
When the final cycle T11 = 1Tc, it corresponds to the comparative example of FIG. When the final cycle T11 = 2Tc, it corresponds to the embodiment of the present invention shown in FIG.
As shown in FIG. 7, the negative pressure is relatively high in the vicinity of T11 = 1Tc in the comparative example. On the other hand, in the vicinity of T11 = 2Tc in the embodiment of the present invention, the negative pressure is relatively weak.
The limit pressure Ps at which satellite droplets are discharged was investigated and shown in FIG.
In FIG. 7, below the limit pressure Ps, the negative pressure in the pressure chamber 28 increases, and satellite droplets are generated with high probability. Above the critical pressure Ps, the negative pressure in the pressure chamber 28 is suppressed, and the generation of satellite droplets is reduced.
Therefore, by setting the final period T11 in the range of 1.9 Tc to 2.1 Tc as described above, the generation of satellite droplets can be reduced.
　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おいて、高速、高駆動効率でのマルチ駆動を可能にしつつ、サテライト滴の発生を低減することができる。 As described above, according to the present embodiment, it is possible to reduce the generation of satellite droplets while enabling multi-drive at high speed and high drive efficiency in 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。 The present invention can be used for an inkjet recording device.
１    インクジェット記録装置
１０  搬送部
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（主滴）
２４  サテライト滴
２５  ヘッド駆動部
２６  圧電素子
２７  ノズル
２８  圧力室
２９  側壁
３０  クリーニング部
４０  制御部
５０  記憶部
７０  通信部
９０  電力供給部 1 Inkjet recording device 10 Conveying unit 20 Recording operation unit 21 Inkjet head 22 Meniscus 23 Ink droplets (main droplets)
24 Satellite drops 25 Head drive unit 26 Piezoelectric element 27 Nozzle 28 Pressure chamber 29 Side wall 30 Cleaning unit 40 Control unit 50 Storage unit 70 Communication unit 90 Power supply unit

Claims (8)

  1. ノズルに連通する圧力室を有し、この圧力室に連通するインクを、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１液滴吐出させる吐出駆動パルスを、記録動作時における記録媒体上の１ドット形成のための１駆動周期において複数回印加するマルチ駆動を実行可能にされ、
    前記ヘッド駆動部は前記マルチ駆動において、前記１駆動周期内の最終の吐出駆動パルスとその直前の吐出駆動パルスとの間の時間を、その他の吐出駆動パルス間の時間より長くするインクジェット記録装置。     An inkjet head that has a pressure chamber that communicates with a nozzle and ejects ink that communicates with this pressure chamber from the nozzle.
    A head drive unit that drives a recording operation by the inkjet head is provided.
    The head drive unit
    A drive pulse voltage for expanding and contracting the pressure chamber, which is a discharge drive pulse for ejecting one droplet of ink from the nozzle, is performed a plurality of times in one drive cycle for forming one dot on a recording medium during a recording operation. Enables multi-drive to apply,
    The head drive unit is an inkjet recording device that makes the time between the final discharge drive pulse in the one drive cycle and the discharge drive pulse immediately before the final discharge drive pulse in the multi-drive longer than the time between the other discharge drive pulses.
  2. 前記ヘッド駆動部は前記マルチ駆動において、前記最終の吐出駆動パルスの開始時とその直前の吐出駆動パルスの開始時の間の時間を、前記圧力室の固有振動周期の１．９倍から２．１倍の範囲とする請求項１に記載のインクジェット記録装置。 In the multi-drive, the head drive unit sets the time between the start of the final discharge drive pulse and the start of the discharge drive pulse immediately before the start of the final discharge drive pulse from 1.9 times to 2.1 times the natural vibration cycle of the pressure chamber. The inkjet recording apparatus according to claim 1.
  3. 前記ヘッド駆動部は前記マルチ駆動において、前記最終の吐出駆動パルスの開始時とその直前の吐出駆動パルスの開始時の間の時間を、前記圧力室の固有振動周期の２．０倍とする請求項１に記載のインクジェット記録装置。 Claim 1 in which the head drive unit sets the time between the start of the final discharge drive pulse and the start of the discharge drive pulse immediately before the start of the final discharge drive pulse to 2.0 times the natural vibration cycle of the pressure chamber in the multi-drive. The inkjet recording apparatus according to the above.
  4. 前記ヘッド駆動部は前記マルチ駆動において、前記最終の吐出駆動パルスの直前の吐出駆動パルスまでのパルス周期を、前記圧力室の固有振動周期の１．０倍とする請求項３に記載のインクジェット記録装置。 The inkjet recording according to claim 3, wherein the head drive unit sets the pulse period up to the discharge drive pulse immediately before the final discharge drive pulse to 1.0 times the natural vibration cycle of the pressure chamber in the multi-drive. Device.
  5. ノズルに連通する圧力室を有し、この圧力室に連通するインクを、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１液滴吐出させる吐出駆動パルスを、記録動作時における記録媒体上の１ドット形成のための１駆動周期において複数回印加するマルチ駆動を実行するにあたり、
    前記１駆動周期内の最終の吐出駆動パルスとその直前の吐出駆動パルスとの間の時間を、その他の吐出駆動パルス間の時間より長くする記録動作駆動方法。     A recording operation driving method that has a pressure chamber communicating with a nozzle and drives a recording operation by an inkjet head that ejects ink communicating with the pressure chamber from the nozzle.
    A drive pulse voltage for expanding and contracting the pressure chamber, which is a discharge drive pulse for ejecting one droplet of ink from the nozzle, is performed a plurality of times in one drive cycle for forming one dot on a recording medium during a recording operation. In executing the applied multi-drive
    A recording operation drive method in which the time between the final discharge drive pulse in the one drive cycle and the discharge drive pulse immediately before the final discharge drive pulse is made longer than the time between the other discharge drive pulses.
  6. 前記マルチ駆動を実行するにあたり、前記最終の吐出駆動パルスの開始時とその直前の吐出駆動パルスの開始時の間の時間を、前記圧力室の固有振動周期の１．９倍から２．１倍の範囲とする請求項５に記載の記録動作駆動方法。 In executing the multi-drive, the time between the start of the final discharge drive pulse and the start of the discharge drive pulse immediately before the start is in the range of 1.9 times to 2.1 times the natural vibration cycle of the pressure chamber. The recording operation driving method according to claim 5.
  7. 前記マルチ駆動を実行するにあたり、前記最終の吐出駆動パルスの開始時とその直前の吐出駆動パルスの開始時の間の時間を、前記圧力室の固有振動周期の２．０倍とする請求項５に記載の記録動作駆動方法。 The fifth aspect of claim 5 in which the time between the start of the final discharge drive pulse and the start of the discharge drive pulse immediately before the start of the final discharge drive pulse is 2.0 times the natural vibration cycle of the pressure chamber in executing the multi-drive. Recording operation drive method.
  8. 前記マルチ駆動を実行するにあたり、前記最終の吐出駆動パルスの直前の吐出駆動パルスまでのパルス周期を、前記圧力室の固有振動周期の１．０倍とする請求項７に記載の記録動作駆動方法。 The recording operation drive method according to claim 7, wherein in executing the multi-drive, the pulse period up to the discharge drive pulse immediately before the final discharge drive pulse is 1.0 times the natural vibration cycle of the pressure chamber. ..
PCT/JP2020/002296 2020-01-23 2020-01-23 Ink-jet recording device and recording operation driving method WO2021149217A1 (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2014065149A (en) * 2012-09-24 2014-04-17 Fujifilm Corp Driving method of liquid discharge head and image forming apparatus
WO2014185142A1 (en) * 2013-05-13 2014-11-20 コニカミノルタ株式会社 Inkjet head, method for driving same, and inkjet printer
US20160082722A1 (en) * 2014-09-22 2016-03-24 Kabushiki Kaisha Toshiba Drive method and drive apparatus for ink jet head
WO2018043074A1 (en) * 2016-08-31 2018-03-08 コニカミノルタ株式会社 Ink jet recording apparatus and ink jet recording method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014065149A (en) * 2012-09-24 2014-04-17 Fujifilm Corp Driving method of liquid discharge head and image forming apparatus
WO2014185142A1 (en) * 2013-05-13 2014-11-20 コニカミノルタ株式会社 Inkjet head, method for driving same, and inkjet printer
US20160082722A1 (en) * 2014-09-22 2016-03-24 Kabushiki Kaisha Toshiba Drive method and drive apparatus for ink jet head
WO2018043074A1 (en) * 2016-08-31 2018-03-08 コニカミノルタ株式会社 Ink jet recording apparatus and ink jet recording method

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