EP3670191A1 - Schaltung und verfahren zur erkennung und steuerung von viskoelastizitätsveränderungen in einem tintenstrahldruckkopf - Google Patents

Schaltung und verfahren zur erkennung und steuerung von viskoelastizitätsveränderungen in einem tintenstrahldruckkopf Download PDF

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Publication number
EP3670191A1
EP3670191A1 EP18213111.0A EP18213111A EP3670191A1 EP 3670191 A1 EP3670191 A1 EP 3670191A1 EP 18213111 A EP18213111 A EP 18213111A EP 3670191 A1 EP3670191 A1 EP 3670191A1
Authority
EP
European Patent Office
Prior art keywords
duct
liquid
ejection
droplet
acoustic pressure
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.)
Withdrawn
Application number
EP18213111.0A
Other languages
English (en)
French (fr)
Inventor
Roel M.P. HEIJNEN
Johannes A.T. Gollatz
Amol A. KHALATE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Holding BV
Original Assignee
Canon Production Printing Holding BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Production Printing Holding BV filed Critical Canon Production Printing Holding BV
Priority to EP18213111.0A priority Critical patent/EP3670191A1/de
Publication of EP3670191A1 publication Critical patent/EP3670191A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/0451—Control methods or devices therefor, e.g. driver circuits, control circuits for detecting failure, e.g. clogging, malfunctioning actuator
    • 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
    • B41J2/04571—Control methods or devices therefor, e.g. driver circuits, control circuits detecting viscosity
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14354—Sensor in each pressure chamber

Definitions

  • the present invention generally pertains to detecting disturbances in a pressure chamber or nozzle of an inkjet print head, in particular a piezo-actuated inkjet print head.
  • the invention relates to detecting changes in visco-elasticity when printing with water-based ink.
  • Visco-elasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied. Elastic materials, on the other hand, strain when stretched, and immediately return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain. In viscoelastic materials, the bonds are gradually disrupted and the force required in order to maintain a constant deformation gradually decreases (usually exponentially) over time. Some examples of viscoelastic materials include amorphous polymers, semi-crystalline polymers, biopolymers, metals at very high temperatures, and bitumen materials.
  • piezo-actuator for generating a pressure wave in a pressure chamber of an inkjet print head such that a droplet of liquid, usually ink, is expelled through a nozzle, which nozzle is in fluid communication with the pressure chamber.
  • the piezo-actuator (or an additional piezo-element or a dedicated part of the piezo-actuator) may be used to detect a pressure wave in the pressure chamber. For example, after actuation, a residual pressure wave remains in the pressure chamber and the residual pressure wave may be detected using the piezo-actuator.
  • a method of operating a droplet ejection device according to claim 1 is provided.
  • a droplet ejection device is provided.
  • the present invention comprises a software product comprising program code on a machine-readable non-transitory medium, the program code, when loaded into a processor of the droplet ejection device of the present invention, causes the processor to perform a method of the present invention.
  • a method of operating a droplet ejection device comprises an ejection unit arranged to eject droplets of a liquid and comprising a nozzle formed in a nozzle face, a liquid duct connected to the nozzle, and an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, characterized by a step of detecting visco-elastic liquid in the duct by analyzing in the frequency domain a signal S, of acoustic pressure fluctuations decaying in the duct after the ejection of a droplet obtained from the transducer.
  • Signal S of acoustic pressure fluctuations is detected with the piezo actuator which acts as a sensor and provides an electric signal that corresponds to the residual pressure wave in the ink duct as a function of time.
  • this time domain signal is transformed to the frequency domain and then further analyzed. Standard ways may be used for transforming the signal to the frequency domain, for example Fourier transforms may be used.
  • the step of detecting comprises analyzing in the frequency domain a decay time constant, ⁇ s , of signal S of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet, which pressure fluctuations cause a response of the transducer (28); and determining a decay time constant difference, ⁇ , between the decay time constant of signal S of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet, ⁇ s , and the decay time constant of reference signal S ref , ⁇ ref , of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet in a properly functioning reference ejection unit, and determining whether the decay time constant difference, ⁇ , exceeds a threshold.
  • the step of detecting comprises a step of analyzing in the frequency domain an energy, E s , of signal S, of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet, which pressure fluctuations cause a response of the transducer (28); and determining an energy difference, ⁇ E, between the decay time constant of signal S, of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet and the energy of reference signal S ref , E ref , of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet in a properly functioning reference ejection unit, and determining whether the energy difference, ⁇ E, exceeds a threshold.
  • the step of detecting comprises a step of analyzing in the frequency domain a frequency, f s , of signal S, of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet, which pressure fluctuations cause a response of the transducer (28); and determining a frequency difference, ⁇ f, between the decay time constant of signal S, of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet and the decay time constant of reference signal S ref , f ref , of acoustic pressure fluctuations decaying in the duct (16) after the ejection of a droplet in a properly functioning reference ejection unit, and determining whether the frequency difference, ⁇ f, exceeds a threshold.
  • the method of the present invention comprises that a visco-elastic liquid is detected in the duct when it is determined that the decay time constant difference ⁇ , the energy difference ⁇ E, and the frequency difference ⁇ f each exceed their respective thresholds simultaneously.
  • the method of the present invention comprises determining a composite parameter and composite threshold both of which include a factor for each of the decay time constant difference ⁇ , the energy difference ⁇ E, and the frequency difference ⁇ f, and determining that visco-elastic liquid is detected in the duct when the composite parameter exceeds the composite threshold.
  • the method of the present invention comprises performing a maintenance action in the ejection unit when it is determined that visco-elastic liquid is detected in the duct.
  • the present invention comprises a step of adapting one or more parameters of the liquid to be jetted when the analysis in the frequency domain of signal, S, determines the presence of visco-elastic liquid on the nozzle face (24), wherein the one or more parameters of the liquid to be jetted are the amount of viscosity correction component added to the liquid, and the temperature of the liquid to be jetted.
  • the method of the present invention comprises a step of adapting parameters of the acoustic pressure wave created in the liquid in the duct when the analysis in the frequency domain of signal, S, determines the presence of visco-elastic liquid on the nozzle face.
  • the step of adapting parameters of the acoustic pressure wave created in the liquid in the duct comprises adapting a jetting pulse applied to the electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct.
  • the step of adapting parameters of the acoustic pressure wave created in the liquid in the duct comprises adapting an under pressure created in the liquid in the duct such that the amount of liquid jetted is changed.
  • the method according to the present invention comprises the composite parameter y as defined above and a first composite threshold T 1 , a second composite threshold T 2 , wherein:
  • the method comprises a third composite threshold T 3 , wherein:
  • the first maintenance action comprises adapting the under pressure created in the liquid in the duct
  • the second maintenance action comprises adapting the temperature of the liquid in the duct
  • the third maintenance action comprises adapting the jetting pulse waveform.
  • thresholds as defined above depend on the configuration of the printing system, e.g. the acoustics of the ink duct and the ink present in said ducts. Therefore, for each printing system threshold values need to be determined. Numerical values of ranges for thresholds are therefore system dependent.
  • the present invention also comprises a droplet ejection device comprising a number of ejection units arranged to eject droplets of a liquid and each comprising a nozzle formed in a nozzle face, a liquid duct connected to the nozzle, and an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, characterized in that at least one of the number of ejection units is associated with a processor configured to perform any of the methods of the present invention.
  • the present invention also comprises a software product comprising program code on a machine-readable non-transitory medium, the program code, when loaded into a processor of the droplet ejection device of the present invention, causes the processor to perform any of the methods of the present invention.
  • the present invention comprises a printing system comprising the droplet ejection device of the present invention, and a software product comprising program code on a machine-readable non-transitory medium, the program code, when loaded into a control unit of the printing system according the present invention, causes the control unit to perform the method according to any of the embodiments of the present invention.
  • FIG. 1 A single ejection unit of an ink jet print head is shown in Fig. 1 .
  • the print head constitutes an example of a droplet ejection device according to the invention.
  • the device comprises a wafer 10 and a support member 12 that are bonded to opposite sides of a thin flexible membrane 14.
  • a recess that forms an ink duct 16 is formed in the face of the wafer 10 that engages the membrane 14, e.g. the bottom face in Fig. 1 .
  • the ink duct 16 has an essentially rectangular shape.
  • An end portion on the left side in Fig. 1 is connected to an ink supply line 18 that passes through the wafer 10 in thickness direction of the wafer and serves for supplying liquid ink to the ink duct 16.
  • An opposite end of the ink duct 16, on the right side in Fig. 1 is connected, through an opening in the membrane 14, to a chamber 20 that is formed in the support member 12 and opens out into a nozzle 22 that is formed in a nozzle face 24 constituting the bottom face of the support member.
  • the support member 12 Adjacent to the membrane 14 and separated from the chamber 20, the support member 12 forms another cavity 26 accommodating a piezoelectric actuator 28 that is bonded to the membrane 14.
  • An ink supply system which has not been shown here keeps the pressure of the liquid ink in the ink duct 16 slightly below the atmospheric pressure, so as to prevent the ink from leaking out through the nozzle 22.
  • the nozzle face 24 is made of or coated with a material which is wetted by the ink, so that adhesion forces cause a pool 30 of ink to be formed on the nozzle face 24 around the nozzle 22.
  • the pool 30 is delimited on the outward (bottom) side by a meniscus 32a.
  • the piezoelectric transducer 28 has electrodes 34 that are connected to an electronic circuit that has been shown in the lower part of Fig. 1 .
  • one electrode of the transducer is grounded via a line 36 and a resistor 38.
  • Another electrode of the transducer is connected to an output of an amplifier 40 that is feedback-controlled via a feedback network 42, so that a voltage V applied to the transducer will be proportional to a signal on an input line 44 of the amplifier.
  • the signal on the input line 44 is generated by a D/A-converter 46 that receives a digital input from a local digital controller 48.
  • the controller 48 is connected to a processor 50.
  • the processor 50 sends a command to the controller 48 which outputs a digital signal that causes the D/A-converter 46 and the amplifier 40 to apply an actuation pulse to the transducer 28.
  • This voltage pulse causes the transducer to deform in a bending mode. More specifically, the transducer 28 is caused to flex downward, so that the membrane 14 which is bonded to the transducer 28 will also flex downward, thereby to increase the volume of the ink duct 16. As a consequence, additional ink will be sucked-in via the supply line 18.
  • the membrane 14 will flex back into the original state, so that a positive acoustic pressure wave is generated in the liquid ink in the duct 16.
  • This pressure wave propagates to the nozzle 22 and causes an ink droplet to be expelled.
  • the pressure wave will then be reflected at the meniscus 32a and will oscillate in the cavity formed between the meniscus and the left end of the duct 16 in Fig. 1 .
  • the oscillation will be damped due to the viscosity of the ink.
  • the transducer 28 is energized with a quench pulse which has a polarity opposite to that of the actuation pulse and is timed such that the decaying oscillation will be suppressed further by destructive interference.
  • the electrodes 34 of the transducer 28 are also connected to an A/D converter 52 which measures a voltage drop across the transducer and also a voltage drop across the resistor 38 and thereby implicitly the current flowing through the transducer.
  • Corresponding digital signals S are forwarded to the controller 48 which can derive the impedance of the transducer 28 from these signals.
  • the measured electric response (current, voltage, impedance, etc.) is signaled to the processor 50 where the electric response is processed further.
  • Fig. 2a In the left part of Fig. 2a the typical stages in the formation of a droplet of liquid can be observed.
  • the first stage which is depicted in the two first images from left to right in Fig. 2a , is usually referred to as start-up phase.
  • start-up phase a negative pressure wave hits the connection-nozzle interface, causing the surface of the liquid to be sucked into the nozzle.
  • This stage is required in order to build up enough energy for the second stage, usually referred to as drop initiation stage.
  • drop initiation stage the pressure at the connection-nozzle interface becomes positive, causing the free surface to be pushed out of the nozzle.
  • a third different stage begins when the pressure decreases again.
  • the free surface (usually referred to as ligament in this stage) has enough velocity and inertia at this third stage to overcome the surface tension, and to not reverse its direction. As a consequence, the ligament becomes thinner, as can be readily observed in the fourth image from left to right.
  • a final stage in the droplet formation process is reached, reflected in the last two images from left to right, which is usually referred to as viscous loss in tail resorption.
  • the ligament breaks off and a drop is created travelling with a certain velocity and volume.
  • the liquid in the duct still oscillates slightly, but these residual vibrations are usually damped out by viscous dissipation, and are usually too small to result in an additional drop.
  • the acoustic pressure fluctuations waveform 31 is shown in Fig. 3a along with the acoustic pressure fluctuations waveform 32.
  • the acoustic pressure fluctuations waveform 31 relates to the acoustic pressure fluctuations decaying in the duct of the droplet ejection device after the ejection of a droplet obtained from the transducer of the droplet ejection device in the case in which the liquid to be jetted is not visco-elastic.
  • acoustic pressure fluctuations waveform 32 relates to the acoustic pressure fluctuations decaying in the duct of the droplet ejection device after the ejection of a droplet obtained from the transducer of the droplet ejection device in the case in which the liquid to be jetted has visco-elastic properties.
  • Fig. 3a allows readily observing that waveform 31 and waveform 32 are perceptibly similar.
  • the acoustic pressure fluctuations waveform 31 and the acoustic pressure fluctuations waveform 32 shown in Fig. 3a are transformed to the frequency domain by using a Fast Fourier Transform.
  • a person skilled in the art would readily contemplate any other operator to transform a signal in the time domain to the frequency domain.
  • Fig. 3b shows the acoustic pressure fluctuations waveform 31 and the acoustic pressure fluctuations waveform 32 once they have been transformed to the frequency domain, which has as a result acoustic pressure fluctuations waveform 41 and acoustic pressure fluctuations waveform 42.
  • acoustic pressure fluctuations waveform 41 relates to the acoustic pressure fluctuations decaying in the duct of the droplet ejection device after the ejection of a droplet obtained from the transducer of the droplet ejection device in the case in which the liquid to be jetted is not visco-elastic.
  • acoustic pressure fluctuations waveform 42 relates to the acoustic pressure fluctuations decaying in the duct of the droplet ejection device after the ejection of a droplet obtained from the transducer of the droplet ejection device in the case in which the liquid to be jetted has visco-elastic properties. It can be readily observed that the differences shown in the time domain between acoustic pressure fluctuations waveform 31 and acoustic pressure fluctuations waveform 32 have been exacerbated by the transformation to the frequency domain. In this way, it becomes feasible designing an algorithm capable of distinguishing acoustic pressure fluctuations waveform 41 from acoustic pressure fluctuations waveform 42 based on their parameters.
  • Table 1 shows the parameters measured from acoustic pressure fluctuations waveform 41 and acoustic pressure fluctuations waveform 42.
  • the parameters relating to acoustic pressure fluctuations waveform 41 are shown in the left part of Table 1 in the column Nominal.
  • the parameters relating to acoustic pressure fluctuations waveform 42 are shown in the left part of Table 1 in the column Viscoelastic.
  • Table 1 relates to an analysis of the parameters of the main peak of the acoustic pressure fluctuations waveforms 41 and 42.
  • An analysis of the parameters shown in the upper part of Table 1 allows inferring approximate thresholds related to frequency, energy, and damping, which allow detecting the presence of visco-elastic liquid.
  • the above example represents a specific configuration of the printing system with acoustics of the ink duct and the ink present in said ducts that are specific for said printing system. Therefore, for the indicated threshold values are specifically determined for the exemplified printing system. In another printing system, the thresholds for the same parameters may be quite different and even outside the presently determined range.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP18213111.0A 2018-12-17 2018-12-17 Schaltung und verfahren zur erkennung und steuerung von viskoelastizitätsveränderungen in einem tintenstrahldruckkopf Withdrawn EP3670191A1 (de)

Priority Applications (1)

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EP18213111.0A EP3670191A1 (de) 2018-12-17 2018-12-17 Schaltung und verfahren zur erkennung und steuerung von viskoelastizitätsveränderungen in einem tintenstrahldruckkopf

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EP18213111.0A EP3670191A1 (de) 2018-12-17 2018-12-17 Schaltung und verfahren zur erkennung und steuerung von viskoelastizitätsveränderungen in einem tintenstrahldruckkopf

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EP3670191A1 true EP3670191A1 (de) 2020-06-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023175924A1 (ja) * 2022-03-18 2023-09-21 コニカミノルタ株式会社 インクジェットヘッド及びインクジェット記録装置

Citations (16)

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US5929875A (en) * 1996-07-24 1999-07-27 Hewlett-Packard Company Acoustic and ultrasonic monitoring of inkjet droplets
US6375299B1 (en) * 1998-11-02 2002-04-23 Encad, Inc. Faulty ink ejector detection in an ink jet printer
US20050219282A1 (en) * 2004-03-30 2005-10-06 Yasuhiko Kachi Ink supply device for inkjet printer
EP1609600A1 (de) * 2004-06-23 2005-12-28 Océ-Technologies B.V. Tintenstrahlsystem, Verfahren zu dessen Herstellung und Verwendung dieses Systems
US20060017765A1 (en) * 2004-07-20 2006-01-26 Kabushiki Kaisha Toshiba Droplet jetting apparatus and display device manufacturing method
US8459768B2 (en) * 2004-03-15 2013-06-11 Fujifilm Dimatix, Inc. High frequency droplet ejection device and method
US20140216141A1 (en) * 2013-02-07 2014-08-07 Palo Alto Research Center Incorporated Piezo Actuated Fluid Dispenser Fluid Characterization
EP2842752A1 (de) * 2013-08-21 2015-03-04 Palo Alto Research Center Incorporated Gesundheitsdetektion eines Tintenstrahldruckkopfes
US20150258780A1 (en) * 2014-03-12 2015-09-17 Ryuichi Hayashi Liquid viscosity detecting method for liquid droplet ejecting device, control method for liquid droplet ejecting device, and liquid droplet ejecting device
US20150367633A1 (en) * 2014-06-19 2015-12-24 Ricoh Company, Ltd. Liquid droplet ejecting device, inkjet recording apparatus, liquid droplet ejecting method, and storage medium for liquid droplet ejecting method
US20160016400A1 (en) * 2014-07-15 2016-01-21 Océ-Technologies B.V. Method for evaluating a status of an inkjet print head
WO2016113232A1 (en) * 2015-01-13 2016-07-21 Oce-Technologies B.V. Method for detecting an operating status of an inkjet nozzle
US20160243825A1 (en) * 2015-02-19 2016-08-25 Seiko Epson Corporation Liquid discharging apparatus and control method of liquid discharging apparatus
EP3112160A1 (de) * 2015-06-29 2017-01-04 OCE-Technologies B.V. Flüssigkeitsstrahlvorrichtung
WO2017144335A1 (en) * 2016-02-25 2017-08-31 OCE Holding B.V. Method for detecting disturbance in droplet ejection of an inkjet print head
WO2018024536A1 (en) * 2016-08-02 2018-02-08 OCE Holding B.V. Droplet property control in an inkjet print head

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5929875A (en) * 1996-07-24 1999-07-27 Hewlett-Packard Company Acoustic and ultrasonic monitoring of inkjet droplets
US6375299B1 (en) * 1998-11-02 2002-04-23 Encad, Inc. Faulty ink ejector detection in an ink jet printer
US8459768B2 (en) * 2004-03-15 2013-06-11 Fujifilm Dimatix, Inc. High frequency droplet ejection device and method
US20050219282A1 (en) * 2004-03-30 2005-10-06 Yasuhiko Kachi Ink supply device for inkjet printer
EP1609600A1 (de) * 2004-06-23 2005-12-28 Océ-Technologies B.V. Tintenstrahlsystem, Verfahren zu dessen Herstellung und Verwendung dieses Systems
US20060017765A1 (en) * 2004-07-20 2006-01-26 Kabushiki Kaisha Toshiba Droplet jetting apparatus and display device manufacturing method
US20140216141A1 (en) * 2013-02-07 2014-08-07 Palo Alto Research Center Incorporated Piezo Actuated Fluid Dispenser Fluid Characterization
EP2842752A1 (de) * 2013-08-21 2015-03-04 Palo Alto Research Center Incorporated Gesundheitsdetektion eines Tintenstrahldruckkopfes
US20150258780A1 (en) * 2014-03-12 2015-09-17 Ryuichi Hayashi Liquid viscosity detecting method for liquid droplet ejecting device, control method for liquid droplet ejecting device, and liquid droplet ejecting device
US20150367633A1 (en) * 2014-06-19 2015-12-24 Ricoh Company, Ltd. Liquid droplet ejecting device, inkjet recording apparatus, liquid droplet ejecting method, and storage medium for liquid droplet ejecting method
US20160016400A1 (en) * 2014-07-15 2016-01-21 Océ-Technologies B.V. Method for evaluating a status of an inkjet print head
WO2016113232A1 (en) * 2015-01-13 2016-07-21 Oce-Technologies B.V. Method for detecting an operating status of an inkjet nozzle
US20160243825A1 (en) * 2015-02-19 2016-08-25 Seiko Epson Corporation Liquid discharging apparatus and control method of liquid discharging apparatus
EP3112160A1 (de) * 2015-06-29 2017-01-04 OCE-Technologies B.V. Flüssigkeitsstrahlvorrichtung
WO2017144335A1 (en) * 2016-02-25 2017-08-31 OCE Holding B.V. Method for detecting disturbance in droplet ejection of an inkjet print head
WO2018024536A1 (en) * 2016-08-02 2018-02-08 OCE Holding B.V. Droplet property control in an inkjet print head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023175924A1 (ja) * 2022-03-18 2023-09-21 コニカミノルタ株式会社 インクジェットヘッド及びインクジェット記録装置

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