EP1872952A1 - Tintenstrahldruckkopf mit einem akustischen Filter - Google Patents

Tintenstrahldruckkopf mit einem akustischen Filter Download PDF

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Publication number
EP1872952A1
EP1872952A1 EP06116215A EP06116215A EP1872952A1 EP 1872952 A1 EP1872952 A1 EP 1872952A1 EP 06116215 A EP06116215 A EP 06116215A EP 06116215 A EP06116215 A EP 06116215A EP 1872952 A1 EP1872952 A1 EP 1872952A1
Authority
EP
European Patent Office
Prior art keywords
ink
pressure chamber
supply path
jet printhead
ink jet
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Withdrawn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
EP06116215A
Other languages
English (en)
French (fr)
Inventor
Hans Reinten
Marcus J. Van Den Berg
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 Netherlands BV
Original Assignee
Oce Technologies 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 Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP06116215A priority Critical patent/EP1872952A1/de
Publication of EP1872952A1 publication Critical patent/EP1872952A1/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Withdrawn legal-status Critical Current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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/19—Ink jet characterised by ink handling for removing air bubbles
    • 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
    • B41J2/14274—Structure of print heads with piezoelectric elements of stacked structure type, deformed by compression/extension 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/1707—Conditioning of the inside of ink supply circuits, e.g. flushing during start-up or shut-down
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17593—Supplying ink in a solid state
    • 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
    • B41J2002/14241—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm having a cover around the piezoelectric thin film element
    • 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
    • B41J2002/14403—Structure thereof only for on-demand ink jet heads including a filter

Definitions

  • the present invention relates to an ink jet printhead having a plurality of ink channels defined in a channel plate, wherein each ink channel comprises an ink supply path, an ink pressure chamber and an ink passage, arranged for enabling ink to flow from a common ink reservoir through the ink supply path into the ink pressure chamber, to leave the pressure chamber and to flow through the ink passage to an associated nozzle, an electromechanical actuator being operationally connected to the ink pressure chamber for pressurising the ink contained therein to produce an ink droplet ejection through the associated nozzle, wherein the ink supply path extends transversely of the ink pressure chamber.
  • a known ink jet printer comprises a carriage supporting four ink jet printheads, one for each of the colours cyan, magenta, yellow and black.
  • the carriage can be moved in reciprocation in a main scanning direction with respect to the ink receiving medium in order to print the swaths of images.
  • European patent application no. 05108188 describes an ink jet printhead of the type indicated above, provided with a controller which has been programmed to control the printer to automatically carry out the steps of detecting the presence of a gas bubble inside the ink pressure chamber, interrupting the print process, modifying the print strategy to avoid an ink channel failure and continuing the printing process according to the modified print strategy.
  • a modification of the printing strategy consists in lowering the frequency at which the electromechanical actuator is driven.
  • the application describes the possibility to modify the frequency and/or amplitude at which the electromechanical actuator are driven in such a way that the gas bubble is actively removed from the ink chamber.
  • modifications of the print strategy are undesirable since they have an impact on the quality of printed images. For example, if an image contains many thin lines, it may happen that the printed thin lines suffer from erosion due to the fact that less droplets are jetted to form the lines.
  • the object of the present invention is to improve an ink jet printer of the type set-forth such that the admission of gas bubbles in the ink pressure chamber is almost avoided and such that the need to take measures to avoid ink channel failure due to the presence of a gas bubble in the ink pressure chamber is diminished.
  • This object is achieved by providing the printhead with an actuable element for producing acoustic waves in the ink contained in the ink supply path.
  • the inventors have noticed that the stability of the ink jet printhead is improved when the actuable element is operated. As a consequence of the movement of the actuable element, acoustic waves are generated in the ink present in the ink supply path. An increased stability of the printhead is observed, which means that much less ink channel failures occur during a given period of observation compared to the known printhead. Consequently, the need to take measures such as the modification of the print strategy is strongly reduced, which in turns increases the quality of the images printed by the printhead. Moreover, the productivity of the ink jet printer provided with the printhead according to the invention is greatly enhanced.
  • the printhead of the invention With the printhead of the invention, less gas bubbles (or even no gas bubble) enter the ink pressure chamber, due to the acoustic waves created in the ink supply path by the actuable element and acting as an acoustic filter.
  • the effect of this acoustic filter is to repel the air bubbles. Consequently, the probability that the air bubbles enter the ink pressure chamber is strongly reduced. Since considerably much less gas bubbles enter the ink pressure chamber, the print strategy does not have to be modified anymore, or at least much less frequently.
  • the actuable element is an auxiliary electromechanical actuator in contact with a flexible sheet placed adjacently to the channel plate portion forming the ink supply path.
  • a piezoelectric actuator leads to particularly good results, especially in the case that the piezoelectric actuator is operable in the shear mode d15.
  • the actuable element is a piece of material connected mechanically to the electromechanical actuator and arranged to transmit vibrating forces onto the channel plate portion forming the ink supply path when the electromechanical actuator is operated.
  • This type of embodiment is easily implementable and is simple to use, since it vibrates in unison with the electromechanical actuator used to create ink jetting.
  • Fig. 1A shows a schematic view of a known hot melt ink jet printhead 1 comprising a channel plate 8 having two ink channels arrays extending in the z-direction, one array being placed at each side of the channel plate 8.
  • an actuator block 14 is firmly attached thereto.
  • a nozzle plate 10 On the lower portion of the channel plate 8, a nozzle plate 10 defining nozzles is provided for expelling ink droplets 12 onto an ink receiving medium (not shown).
  • an ink reservoir 6 is provided, said ink reservoir 6 being connected to a melting unit 4 being suited for melting hot melt ink and transferring the melt ink to the reservoir 6.
  • Hot melt ink is fed to the melting unit 4 in solid form e.g. as granules 16 or chips.
  • Fig. 1 B shows a cross sectional view in a plane (x, z) of half a printhead of the prior art, crossing the channel plate in the middle plane. Only a part of the channel plate 8 is represented.
  • the printhead comprises electromechanical actuators 20 attached to a substrate 29. Support elements 20b, also attached to the substrate 29 are provided between the electromechanical actuators 20.
  • the electromechanical actuators 20 are made of a multilayered piezoelectric material such as a PZT material.
  • the known ink jet printhead has a plurality of ink channels defined in the channel plate 8, wherein each ink channel comprises an ink supply path, an ink pressure chamber 24 and an ink passage, arranged for enabling ink to flow from a reservoir through the ink supply path into the ink pressure chamber, to leave the pressure chamber and to flow through the ink passage to an associated nozzle.
  • Each electromechanical actuator 20 is operationally connected to the ink pressure chamber for pressurising the ink contained therein to produce an ink droplet ejection through the associated nozzle.
  • One side of a flexible sheet 22 is brought onto the electromechanical actuators 20 while the other side thereof covers the ink pressure chambers 24.
  • FIG. 2A shows a cross-section in a plane (x, y) of the first embodiment of the ink jet printhead.
  • the first embodiment is explained with reference to Fig. 2A, Fig. 2B (a partial section along the line II-II) and Fig. 3 (a detail view of Fig. 2A).
  • a printhead 2 comprises the channel plate 8 which is made of graphite, for example, and which defines ink channels 25 enabling the melt ink 34 to flow from an ink inlet 33 along an ink flow path to an associated nozzle 28. Since the printhead 2 comprises two ink channels arrays extending in the z-direction, two facing ink channels 25 are visible in the cross section of Fig. 2, each one of the shown ink channels belonging to a different array. Within an array, the ink channels 25 and are closely spaced from one another in the z-direction in order to print ink droplets 12 of a receiving medium 40 such as a sheet of paper.
  • the reservoir 6 is suitable for containing liquid melt ink 34 supplied by the melting unit (not shown).
  • the ink reservoir 6 accommodates a heating element (not shown) for heating and maintaining the hot-melt ink above its melting point (e. g. at a temperature of about 100°C).
  • a meniscus 36 of the liquid ink 34 is formed in the reservoir 6.
  • the ink reservoir 6 further accommodates a filter 32 used to prevent solid particles from entering into the ink channels 25 and clogging the nozzles 28.
  • the nozzle plate 10 with nozzles 28 formed therein is attached to the lower surface of the channel plate 8.
  • Each ink channel 25 comprises an ink supply path 30, an ink pressure chamber 24 and an ink passage 26.
  • Ink flows from the reservoir 6 through the filter 32, through the ink inlet 33 and through the ink supply path 30 into the ink pressure chamber 24.
  • Ink leaves the pressure chamber 24 and flows through the ink passage 26 to the associated nozzle 28.
  • the ink pressure chambers which have and axial direction Y that extends vertically in Fig. 2, are formed by grooves which are cut into the surfaces on either side of the channel plate 8.
  • the ink pressure chambers 24 are covered by flexible sheets 22 that are secured to either side of the channel plate 8.
  • Actuator blocks 14 are bonded to either side of the channel plate 8.
  • Each one of the actuator blocks14 comprises a piezoelectric ceramic material having a comb-like structure forming a plurality of parallel piezoelectric fingers 20 extending in the vertical direction (Y-direction). The piezoelectric fingers are attached to the substrate 29.
  • Each piezoelectric finger 20 acts as an electromechanical actuator operationally connected to the ink pressure chamber 24.
  • Each actuator block also comprises electrodes (not shown) associated with each piezoelectric finger 20.
  • a flexible lead foil (not shown) is attached to each one of the actuator blocks 14 and comprises electric leads for individually energising the piezoelectric fingers 20.
  • Each actuator block further comprises a cap 18 for protecting the piezoelectric ceramic material.
  • the piezoelectric finger will expand in the X-direction and will flex the sheet 22 into the ink pressure chamber 24, thereby increasing the pressure of the ink, so that a pressure wave will propagate through the flow passage 26, and an ink droplet 12 will be jetted out from the nozzle 28 in a direction normal to the nozzle plate 10.
  • the ink supply path 30 extends transversely of the ink pressure chamber 24. Its cross section is significantly larger than that of the ink pressure chamber 24. Therefore, when a negative pressure wave propagates in the liquid ink from the ink pressure chamber 24 towards the ink supply path 30, the transition between the ink pressure chamber and the ink supply path acts like an open end at which the acoustic wave is reflected almost completely, creating reversal in the propagation direction. Consequently, a positive pressure wave is reflected which propagates in the ink pressure chamber 24 towards the ink passage 26 and the nozzle 28. At an appropriate timing, the piezoelectric finger 20 is driven again to expand in order to boost the positive pressure wave.
  • the ink jet printhead of the present invention is provided with an actuable element for creating acoustic waves in the liquid ink present in the ink supply path.
  • an actuable element such as a piezoelectric element 38 is positioned adjacent to the top edge of the flexible sheet 22.
  • the piezoelectric element 38 is attached by means of a block 39 to the printhead assembly. Since the channel plate 8 defines in its top area the ink supply path 30, the channel plate is split in its top area in a main part 8a, and a sub part 8b to which the flexible sheet 22 is attached. Some bridges 8c (see Fig. 2B) are provided in the channel plate for defining the ink supply paths 30 and for attaching the sub part 8b to the main part 8a, such bridges being able to be deformed.
  • the channel plate 8 and its sub-parts 8a, 8b and 8c are made of a soft material, such as graphite, for example.
  • a vibrating pressure is exerted on the sub part 8b, the flexible bridges 8c expand and retract periodically and the volume available for the ink in the ink supply is decreased and increased periodically. Consequently, acoustic waves are generated in the ink present in the ink supply path 30.
  • the piezoelectric element 38 is provided with electrodes 42 for applying a voltage thereto and thus causing expansion and retraction strokes of said element.
  • the arrows A in Fig. 3 indicate the direction of the polarisation of the piezoelectric material 38.
  • the arrow B indicates the directions of the expansion and retraction strokes.
  • the arrow C indicates the direction of the ink flow. Due to the flexibility of the sheet 22 and the softness of the channel plate material, when a periodic voltage is applied to the piezoelectric element 38, an alternating pushing and pulling force is exerted onto the sub-part 8b in the X-direction, following the expansion and retraction strokes of the piezoelectric element 38.
  • the piezoelectric material is operable in the shear mode d15.
  • the amplitude of the movement of the tip of the piezoelectric element 38 is typically comprised between 10 nm and 60 nm, depending on the material and the applied voltage.
  • a first experiment 1.1 the piezoelectric element 38 was driven with a zero amplitude signal (i.e. no voltage was applied).
  • the first experiment serves as a reference, because it reproduces the behaviour of the known printhead.
  • An ink channel failure is a state in which the ink pressure chamber is no longer able to eject an ink drop through the associated nozzle when the piezoelectric finger is actuated. This creates an unstable jetting behaviour.
  • the piezoelectric element 38 was driven with an alternative voltage having a sinus-shaped wave with adjustable amplitude and frequency.
  • an alternative voltage having a sinus-shaped wave with adjustable amplitude and frequency.
  • a first experiment 2.1 the piezoelectric element 38 was driven with a zero amplitude signal (i.e. no voltage was applied). Again, the first experiment serves as a reference. After 20 to 30 s of actuation of the piezoelectric fingers 20, about six ink channels out of the 21 observed ink channels had a failure. This signs an unstable jetting behaviour.
  • the piezoelectric element 38 was driven with a sinus voltage signal having a frequency of 100 kHz and an amplitude equal to 100 V. After 60s, less than four ink channel failures were observed. This signs a relatively stable jetting behaviour.
  • the piezoelectric element 38 was driven with a sinus voltage signal having a frequency of 200 kHz and an amplitude equal to 50 V. After 60s, less than four ink channel failures were observed. Again, the jetting behaviour was relatively stable.
  • the piezoelectric element 38 was driven with a sinus voltage signal having a frequency of 400 kHz and an amplitude equal to 20 V. After 60s, less than four ink channel failures were observed. Again, the jetting behaviour was relatively stable.
  • the piezoelectric element 38 was activated with an alternative voltage signal having a sinus-shaped wave with adjustable amplitude and frequency.
  • an amplitude of 200 V was firstly applied.
  • the amplitude of the sinus-shaped wave was decreased by a small voltage step and the observation of the selected ink channels was carried out during 60 s. These steps were repeated until a so-called critical voltage amplitude was reached.
  • the critical voltage amplitude is defined as the amplitude below which the jetting behaviour is unstable.
  • An unstable behaviour is defined as the occurrence of at least four ink channel failures among the 21 observed ink channels and nozzles during the observation period of 60 s.
  • a stable jetting behaviour means that less than four ink channel failures occur after 60 s of observation. According to these definitions, for a stimulating sinus wave voltage having an amplitude above the critical amplitude, the jetting behaviour is stable. On the other hand, for a stimulating sinus wave voltage having an amplitude below the critical amplitude, the jetting behaviour is unstable.
  • Fig. 4 shows a graphical representation of the value of the critical amplitude as a function of the frequency of the stimulating voltage sinus wave applied to the piezoelectric element 38. Since the critical amplitude decreases with increasing frequency, it appears that high frequency values are very-well suited for activating the piezoelectric element 38 such that a stable ink jet printhead is obtained. In particular, for frequencies larger that 300 kHz, a very good stability of the jetting behaviour of the printhead can be achieved for voltages as low as a few volts.
  • the arrow C indicates the direction of the ink flow.
  • the acoustic waves D act as an acoustic filter avoiding the gas bubbles present in the reservoir to enter the ink pressure chamber 24.
  • the acoustic filter is probably able to repel the air bubbles which naturally have the tendency to follow the ink flow (arrow C in Fig. 3) and maintain the air bubbles in the top portion of the ink supply path 30. This could be at the origin of the absence of air bubbles in the ink pressure chamber, and be responsible for an improved stability of the printhead, even at high ink flow rates.
  • FIG. 5A and 5B Another embodiment of the printhead according to the invention is shown in Figs. 5A and 5B (a partial section along the line V-V in Fig. 5A).
  • the actuable element is now a piece of material 43 connected mechanically to the piezoelectric finger 20 by means of the substrate 29.
  • the substrate 29 will follow the expansion and retraction strokes thereof in the x-direction. Since one side of the element 43 is fixed onto the substrate 29, while the opposite side of the element 43 is attached to the top portion of the flexible sheet 22 being itself attached to the sub-part 8b of the channel plate, the element 43 is able to exert an alternately pushing and pulling force in the x-direction onto the channel plate portion 8b when the electromechanical actuator 20 is operated.
  • the bridges 8c are consequently alternately compressed and expanded, following the expansion and retraction strokes of the electromechanical actuator 20.
  • acoustic waves D are created in the ink present in the ink supply path 30.
  • the element 43 has an adequate rigidity such that is able to transmit the vibrating forces caused by the operated piezoelectric finger 20 to the sub-part 8b.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP06116215A 2006-06-28 2006-06-28 Tintenstrahldruckkopf mit einem akustischen Filter Withdrawn EP1872952A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06116215A EP1872952A1 (de) 2006-06-28 2006-06-28 Tintenstrahldruckkopf mit einem akustischen Filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06116215A EP1872952A1 (de) 2006-06-28 2006-06-28 Tintenstrahldruckkopf mit einem akustischen Filter

Publications (1)

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EP1872952A1 true EP1872952A1 (de) 2008-01-02

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013143733A1 (en) * 2012-03-27 2013-10-03 Asml Netherlands B.V. Fuel system for lithographic apparatus, euv source,lithographic apparatus and fuel filtering method
JP2015054521A (ja) * 2013-09-11 2015-03-23 ゼロックス コーポレイションＸｅｒｏｘ Ｃｏｒｐｏｒａｔｉｏｎ 固形インク用ジェットプリンタのインク流路内における気泡の発生を制御するシステムおよび方法
WO2019011674A1 (en) * 2017-07-12 2019-01-17 Mycronic AB PROJECTION DEVICES HAVING ACOUSTIC TRANSDUCERS AND METHODS OF CONTROLLING SAME

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2431457B1 (de) * 1974-07-01 1975-09-18 Olympia Werke Ag, 2940 Wilhelmshaven Gasblasenabscheidungsvorrichtungin einem Tintenversorgungssystem für einen Tintenspritzkopf
WO1995012109A1 (en) * 1993-10-26 1995-05-04 Spectra, Inc. Ink jet head with vacuum reservoir
US5910810A (en) * 1993-05-04 1999-06-08 Markem Corporation Ink jet printing system
US20050185010A1 (en) * 2004-02-19 2005-08-25 Fuji Photo Film Co., Ltd. Image forming apparatus and liquid control method
US20050237366A1 (en) * 2004-04-23 2005-10-27 Konica Minolta Holdings, Inc. Driving method of droplet ejection head

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2431457B1 (de) * 1974-07-01 1975-09-18 Olympia Werke Ag, 2940 Wilhelmshaven Gasblasenabscheidungsvorrichtungin einem Tintenversorgungssystem für einen Tintenspritzkopf
US5910810A (en) * 1993-05-04 1999-06-08 Markem Corporation Ink jet printing system
WO1995012109A1 (en) * 1993-10-26 1995-05-04 Spectra, Inc. Ink jet head with vacuum reservoir
US20050185010A1 (en) * 2004-02-19 2005-08-25 Fuji Photo Film Co., Ltd. Image forming apparatus and liquid control method
US20050237366A1 (en) * 2004-04-23 2005-10-27 Konica Minolta Holdings, Inc. Driving method of droplet ejection head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013143733A1 (en) * 2012-03-27 2013-10-03 Asml Netherlands B.V. Fuel system for lithographic apparatus, euv source,lithographic apparatus and fuel filtering method
US9648714B2 (en) 2012-03-27 2017-05-09 Asml Netherlands B.V. Fuel system for lithographic apparatus, EUV source, lithographic apparatus and fuel filtering method
JP2015054521A (ja) * 2013-09-11 2015-03-23 ゼロックス コーポレイションＸｅｒｏｘ Ｃｏｒｐｏｒａｔｉｏｎ 固形インク用ジェットプリンタのインク流路内における気泡の発生を制御するシステムおよび方法
WO2019011674A1 (en) * 2017-07-12 2019-01-17 Mycronic AB PROJECTION DEVICES HAVING ACOUSTIC TRANSDUCERS AND METHODS OF CONTROLLING SAME
US11065868B2 (en) 2017-07-12 2021-07-20 Mycronic AB Jetting devices with acoustic transducers and methods of controlling same

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