EP0709212A1 - Elimination de gaz dissous d'une encre dans un système à jet d'encre - Google Patents

Elimination de gaz dissous d'une encre dans un système à jet d'encre Download PDF

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Publication number
EP0709212A1
EP0709212A1 EP95305643A EP95305643A EP0709212A1 EP 0709212 A1 EP0709212 A1 EP 0709212A1 EP 95305643 A EP95305643 A EP 95305643A EP 95305643 A EP95305643 A EP 95305643A EP 0709212 A1 EP0709212 A1 EP 0709212A1
Authority
EP
European Patent Office
Prior art keywords
ink
fluid channel
reservoir
substrate
printhead
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Withdrawn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
EP95305643A
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German (de)
English (en)
Inventor
Christopher S. Magirl
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0709212A1 publication Critical patent/EP0709212A1/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention generally relates to inkjet and other types of printers and, more particularly, to the ink flow to the printhead portion of an inkjet printer.
  • An ink jet printer forms a printed image by printing a pattern of individual dots at particular locations of an array defined for the printing medium.
  • the locations are conveniently visualized as being small dots in a rectilinear array.
  • the locations are sometimes called “dot locations”, “dot positions”, or “pixels”.
  • the printing operation can be viewed as the fitting of a pattern of dot locations with dots of ink.
  • Thermal inkjet print cartridges operate by rapidly heating a small volume of ink to cause the ink to vaporize and be ejected through one of a plurality of orifices so as to print a dot of ink on a recording medium, such as a sheet of paper.
  • the orifices are arranged in one or more linear arrays in a nozzle member.
  • the properly sequenced ejection of ink from each orifice causes characters or other images to be printed upon the paper as the printhead is moved relative to the paper.
  • the paper is typically shifted each time the printhead has moved across the paper.
  • the thermal inkjet printer is fast and quiet, as only the ink strikes the paper.
  • An inkjet printhead generally includes: (1) ink channels to supply ink from an ink reservoir to each vaporization chamber proximate to an orifice; (2) a metal orifice plate or nozzle member in which the orifices are formed in the required pattern; and (3) a silicon substrate containing a series of thin film resistors, one resistor per vaporization chamber.
  • an electrical current from an external power supply is passed through a selected thin film resistor.
  • the resistor is then heated, in turn superheating a thin layer of the adjacent ink within a vaporization chamber, causing explosive vaporization, and, consequently, causing a drop of ink to be ejected through an associated nozzle onto the paper.
  • inkjet printing A concern with inkjet printing is the sufficiency of ink flow to the paper or other print media.
  • Print quality is a function of ink flow through the printhead. Too little ink on the paper or other media to be printed upon produces faded and hard-to-read documents.
  • ink is fed from an ink reservoir integral to the printhead or an "off-axis" ink reservoir which feeds ink to the printhead via tubes connecting the printhead and reservoir. Ink is then fed to the various vaporization chambers either through an elongated hole formed in the center of the bottom of the substrate, "center feed", or around the outer edges of the substrate, "edge feed”.
  • the ink then flows to a manifold area, formed in a barrier layer between the substrate and a nozzle member, then into a plurality of ink channels, and finally into the various vaporization chambers.
  • the flow path from the ink reservoir and the manifold inherently provide some restriction on ink flow to the firing chambers.
  • Ink delivery systems are capable of releasing gasses and generating bubbles, thereby causing systems to get clogged and degraded by bubbles.
  • all liquids, including ink contain dissolved air and sometimes other dissolved gasses.
  • the amount of gas that a liquid can hold depends on temperature and pressure, but also depends on the extent of mixing between the gas and liquid and the opportunities the gas has had to escape.
  • Bubbles are not only made of air, but are also made of water vapor and vapors from other ink-vehicle constituents. However, the behavior of all liquids are similar, the hotter the liquid becomes, the less gas it can hold. Both gas release and vapor generation cause bubbles to start and grow as temperature rises.
  • gases inside the bubbles in a water-based ink are always saturated with water vapor.
  • bubbles are made up both of gases, mostly air, and of ink vehicle vapor, mostly water.
  • water vapor is an almost negligible part of the gas in a bubble.
  • water vapor adds importantly to the volume of a bubble. As the temperature rises, the water vapor content of the bubbles increases much more rapidly with temperature than does the air content.
  • bubble generation The best conditions for bubble generation are the simultaneous presence of (1) generating sites, (2) ink flow and (3) bubble accumulators. These three mechanisms work together to produce large bubbles that clog and stop flow in ink delivery systems. When air comes back out of solution as bubbles, it does so at preferential locations, or generation or nucleation sites. Bubbles like to start at edges and comers or at surface scratches, roughness, or imperfections. Very small bubbles tend to stick to the surfaces and resist floating or being swept along in a current of ink. When the bubbles get larger, they are more apt to break loose and move along. However, if the bubbles form in a corner or other out-of-the-way location, it is almost impossible to dislodge them by ink currents.
  • bubbles may not start at gas generating sites when the ink is not flowing past those sites, when the ink is moving, the bubble generation site is exposed to a much larger volume of ink containing dissolved gas molecules. As ink flows past the gas generating site, gas molecules can be brought out of solution to form a bubble and grow; while if the ink was not flowing this could not happen.
  • the third contributor to bubble generation is the accumulator or bubble trap, which can be defined as any expansion and subsequent narrowing along an ink passage.
  • This configuration amounts to a chamber on the ink flow path with an entrance and an exit.
  • the average ink flow rate in terms of volume ink per cross section of area per second, is smaller within the chamber than at the entrance or at the exit.
  • the entrance edge of the chamber will act as a gas generating site because of its sharpness and because of the discontinuity of ink flow over the edge. Bubbles will be generated at this site, and when they become large enough they get moved along toward the exit duct until the exit duct is blocked. Then, unless the system can generate enough pressure to push the bubble through, the ink delivery system will become clogged and ink delivery will be shut down.
  • the chamber allows bubbles to grow larger than the diameter of subsequent ink passageways which may then become blocked.
  • ink flows from the reservoir around the edge of the silicon substrate before being ejected out of the nozzles.
  • warm thermal boundary layers of ink form adjacent the substrate and dissolved gases in the thermal boundary layer of the ink form the bubbles. If the bubbles grow larger than the diameter of subsequent ink passageways these bubbles choke the flow of ink to the vaporization chambers. This results in causing some of the nozzles of the printhead to become temporarily inoperable.
  • the present invention provides a method of avoiding such a malfunction in a liquid inkjet printing system by providing a primary ink reservoir, mounting a printhead having a nozzle array on a carriage, providing an ink vaporization chamber with an activation element therein for expelling a drop of ink from a nozzle in the nozzle array, transporting ink from the primary reservoir to the vaporization chamber, said transporting step including passing the liquid ink past a degassing station, and filling the vaporization chamber with the ink, said filling step occurring after said passing step.
  • Fig. 1 is a perspective view of an inkjet print cartridge.
  • Fig. 2 is a perspective view of the headland area of the inkjet print cartridge of Fig. 1.
  • Fig. 3 is a top plan view of the headland area of the inkjet print cartridge of Fig. 7.
  • Fig. 4 is a top perspective view, partially cut away, of a portion of the printhead assembly showing the relationship of an orifice with respect to a vaporization chamber, a heater resistor, and an edge of the substrate.
  • Fig. 5 is a schematic cross-sectional view of a printhead assembly and the print cartridge as well as the ink flow path around the edges of the substrate.
  • Fig. 6 is a top plan view of a magnified portion of the printhead assembly showing the relationship of ink channels, vaporization chambers, heater resistors, the barrier layer and an edge of the substrate.
  • Fig. 7 is a magnified, partially cut away view in perspective of the portion of the circuit or nozzle member after the nozzle member has been properly positioned over the substrate structure to form a printhead.
  • Fig. 8 is a schematic diagram showing an print cartridge-based degassing mechanism shown immediately upstream of the printhead.
  • Fig. 9 is a schematic diagram showing an an off-axis ink supply system.
  • Fig. 10 is a perspective view of an inkjet print cartridge for use with an off-axis ink supply system.
  • reference numeral 10 generally indicates an inkjet print cartridge for mounting in the carriage of an inkjet printer.
  • the inkjet print cartridge 10 includes a printhead 14 and an ink reservoir 12, which may be a "integral" reservoir, "snap-on” reservoir, or a “reservoir” for receiving an ink from an off-axis ink reservoir.
  • Print cartridge 10 includes snout 11 which contains an internal standpipe 15 (shown in Fig. 8) for transporting ink to the printhead from the reservoir 12.
  • the printhead 14 includes a nozzle member 16 comprising holes or orifices 17 formed in a circuit 18.
  • the circuit 18 includes conductive traces (not shown) which are connected to the substrate electrodes at windows 22, 24 and which are terminated by contact pads 20 designed to interconnect with printer providing externally generated energization signals to the printhead for firing resistors to eject ink drops.
  • Printhead 14 has affixed to the back of the circuit 18 a silicon substrate 28 (not shown) containing a plurality of individually energizable thin film resistors. Each resistor is located generally behind a single orifice 17 and acts as an ohmic heater when selectively energized by one or more pulses applied sequentially or simultaneously to one or more of the contact pads 20.
  • Fig. 2 shows the print cartridge 10 of Fig. 1 with the printhead 14 removed to reveal the headland pattern 50 used in providing a seal between the printhead 14 and the printhead body.
  • Fig. 3 shows the headland area in an enlarged top plan view. Shown in Figs. 1 and 2 is a central slot 52 in the print cartridge 10 for allowing ink from the ink reservoir 12 to flow to a chamber adjacent the back surface of the printhead 14.
  • the headland pattern 50 formed on the print cartridge 10 is configured so that a bead of epoxy adhesive (not shown) dispensed on the inner raised walls 54 and across the wall openings 55 and 56 will form an ink seal between the body 15 of the print cartridge 10 and the back of the printhead 14 when the printhead 14 is pressed into place against the headland pattern 50.
  • FIG. 4 shown is an enlarged view of a single vaporization chamber 72, thin film resistor 70, and frustum shaped orifice 17 after the substrate is secured to the back of the circuit 18 via the thin adhesive layer 84.
  • Silicon substrate 28 has formed on it thin film resistors 70 formed in the barrier layer 30. Also formed on the substrate 28 are electrodes (not shown) for connection to the conductive traces (not shown) on the circuit 18. Also formed on the surface of the substrate 28 is the barrier layer 30 in which is formed the vaporization chambers 72 and ink channels 80. A side edge of the substrate 28 is shown as edge 86.
  • ink flows from the ink reservoir 12 around the side edge 86 of the substrate 28, and into the ink channel 80 and associated vaporization chamber 72, as shown by the arrow 88.
  • a thin layer of the adjacent ink is superheated, causing explosive vaporization and, consequently, causing a droplet of ink to be ejected through the orifice 17.
  • the vaporization chamber 72 is then refilled by capillary action.
  • FIG. 5 Shown in Fig. 5 is a side elevational cross-sectional view showing a portion of the adhesive seal 90, applied to the inner raised wall 54 portion of the print cartridge body and wall openings 55, 56, surrounding the substrate 28 and showing the substrate 28 being adhesively secured to a central portion of the circuit 18 by the thin adhesive layer 84 on the top surface of the barrier layer 30 containing the ink channels and vaporization chambers 72.
  • a portion of the plastic body of the printhead cartridge 10, including raised walls 54 is also shown.
  • Fig. 5 also illustrates how ink 88 from the ink reservoir 12 flows through the central slot 52 formed in the print cartridge 10 and flows around the edges 86 of the substrate 28 through ink channels 80 into the vaporization chambers 72.
  • Thin film resistors 70 are shown within the vaporization chambers 72 . When the resistors 70 are energized, the ink within the vaporization chambers 72 are ejected, as illustrated by the emitted drops of ink 102.
  • warm thermal boundary layers of ink 88 form adjacent the substrate 28. Therefore, dissolved gases in the thermal boundary layer of the ink 88 behind the substrate 28 tend to form the bubbles 89. This results in causing some of the nozzles 17 temporarily becoming inoperable.
  • the total amount of dissolved gases contained within the fluid volume of the boundary layer is small, in reality, all of the ink in the reservoir 12 will eventually flow through the standpipe (shown in Fig. 8), the slot 52 and across the substrate 28 over the lifetime of the print cartridge 10.
  • Bubbles will be generated in this chamber and when they become large enough they get moved along toward the ink chamber. If the chamber allows bubbles to grow larger than the diameter of subsequent ink passageways which may then become blocked. These bubbles choke the flow of ink to the vaporization chambers 72, especially at high firing frequencies, i. e., greater than 8 kHz. This results in causing some of the nozzles 17 to temporarily become inoperable.
  • vaporization chambers 72 and ink channels 80 are shown formed in barrier layer 30.
  • Ink channels 80 provide an ink path between the source of ink and the vaporization chambers 72.
  • the flow of ink into the ink channels 80 and into the vaporization chambers 72 is around the long side edges 86 of the substrate 28 and into the ink channels 80.
  • the relatively narrow constriction points or pinch point gaps 145 created by the pinch points 146 in the ink channels 80 provide viscous damping during refill of the vaporization chambers 72 after firing.
  • the pinch points 146 help control ink blow-back and bubble collapse after firing to improve the uniformity of ink drop ejection.
  • the frequency limit of a thermal inkjet print cartridge is limited by resistance in the flow of ink to the nozzle. However, some resistance in ink flow is necessary to damp meniscus oscillation. Ink flow resistance is intentionally controlled by the pinch point gap 145 gap adjacent the resistor.
  • An additional component to the fluid impedance is the entrance to the firing chamber.
  • the entrance comprises a thin region between the nozzle member 16 and the substrate 28 and its height is essentially a function of the thickness of the barrier layer 30. This region has high fluid impedance, since its height is small.
  • Table II The dimensions of the various elements formed in the barrier layer 30 shown in Fig. 6 are identified in Table II below.
  • Fig. 7 is a magnified, partially cut away view in perspective of the portion of the circuit or nozzle member 18 after the nozzle member 18 has been properly positioned over the substrate structure 28 to form a printhead 14. As shown in Fig. 7, the nozzles 17 are aligned over the vaporization chambers 72. Fig. 7 also illustrates the ink flow 88 from an ink reservoir 12 generally situated below the substrate 28 as the ink flows over an edge 86 of the substrate 28 and enters ink channels 80.
  • Preferred dimensions A, B, and C in Fig. 7 are provided in Table III below, where dimension C is the thickness of the nozzle member 18, dimension B is the thickness of the barrier layer 30, and dimension A is the thickness of the substrate 28.
  • Table III SUBSTRATE, INK CHANNEL AND NOZZLE MEMBER DIMENSIONS IN MICRONS Dimension Minimum Nominal Maximum A 600 625 650 B 19 25 32 C 25 50 75 D 84.7 H 40 55 70 T 50 100 150
  • FIG. 8 shows how ink containing dissolved gases flows from the ink reservoir 12 of the ink cartridge 10 through standpipe 15 and across the degassing heater element 93 separating air and other vapors 91 from the flow of ink 88.
  • Heater element 93 is connected to electrical contacts 95 which can connect to the printer for example through contacts 20. The procedure removes the gases 91 in the standpipe 15 region of the ink cartridge 10 where the presence of bubbles 91 is not damaging to the operation of the printhead.
  • the degassed ink then flows over the substrate 28 to the printhead 14 while the removed gases 91 flow upward from the standpipe 15 into the reservoir 12 where no blockage to the printhead can occur.
  • the gases 91 can be bled from the system through a bleed valve (not shown).
  • Fig. 9 shows the heater element 91 as a resistive coil inserted within the ink passageway, or standpipe 15 of the snout 11 portion of print cartridge 10.
  • the heating element 93 comprises a tubular duct with a roughened internal surface inserted within standpipe 15 which is heated by applying heat externally to the duct to provide not only a thermal boundary layer, but also numerous bubble generation or nucleation sites in order to promote bubble formation and growth.
  • heater element 93 comprises a second silicon substrate inserted in the standpipe 15 upstream of the firing substrate 28. This heater element substrate has multiple resistors, such as resistors 70, etched onto it and operates solely in a pulse warming mode, i.
  • This pulse warming can be accomplished by utilizing a narrower pulse width than required for firing pulses.
  • One skilled in the art will appreciate that the ultimate heater 93 would be optimized to meet the design and space constraints of the print cartridge 10.
  • the ink is not boiled, but rather the heater element 93 warms the ink to a temperature slightly higher than the highest temperature the ink will be exposed to at the thermal boundary layer adjacent the substrate 28 of the printhead (e.g., approximately 70 C).
  • a temperature slightly higher than the highest temperature the ink will be exposed to at the thermal boundary layer adjacent the substrate 28 of the printhead (e.g., approximately 70 C).
  • gas 91 may not be removed from the ink during degassing, unless the temperature of the ink rises above the substrate temperature 28, no more bubbles will form.
  • a significant advantage in using heat as the degassing mechanism is that the ink is only exposed to what normally occurs when the ink is brought in contact with the heated substrate 28 and ink chambers 72. The degassing is simply being moved upstream to a more acceptable region of the ink cartridge 10 where the gases can be removed form the area of the printhead.
  • Fig. 9 is a schematic diagram showing an off-axis ink supply system.
  • the system has a print cartridge 10 which is mounted on the carriage of an inkjet printer (not shown).
  • the print cartridge is connected to an off-axis ink supply bag 19 by a flexible supply tube 13.
  • Off-axis implies that the ink supply bag 19 is preferably mounted on the printer body (not shown) and not on the carriage with the print cartridge 10.
  • the degassing station may be located at either at 93C on the carriage or at 93P on the printer.
  • FIG. 10 Shown in Fig. 10 is a perspective view of an inkjet print cartridge for use with an off-axis ink supply system.
  • the inkjet print cartridge 10' includes a printhead 14' and an optional on-board ink reservoir ink reservoir 12' of low capacity.
  • the inkjet print cartridge 10 receives ink from an off-axis ink supply through supply tube 13.
  • the other features of print cartridge 10' denominated 14', 16', 17', 18', 20', 22', 24', and 36' are the same as for print cartridge 10 in Fig. 1.
  • the features of print cartridge 10 shown in Fig. 2 through Fig. 7 apply to print cartridge 10'.

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  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP95305643A 1994-10-31 1995-08-14 Elimination de gaz dissous d'une encre dans un système à jet d'encre Withdrawn EP0709212A1 (fr)

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US33232594A 1994-10-31 1994-10-31
US332325 1994-10-31

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EP0709212A1 true EP0709212A1 (fr) 1996-05-01

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953447A2 (fr) * 1998-04-30 1999-11-03 Hewlett-Packard Company Conception d'écoulement de l'encre pour obtenir une meilleure évacuation de la chaleur d'une tête d'impression à jet d'encre et pour fournir des moyens d'accumulation d'air
US5984455A (en) * 1997-11-04 1999-11-16 Lexmark International, Inc. Ink jet printing apparatus having primary and secondary nozzles
US6017112A (en) * 1997-11-04 2000-01-25 Lexmark International, Inc. Ink jet printing apparatus having a print cartridge with primary and secondary nozzles
US6076910A (en) * 1997-11-04 2000-06-20 Lexmark International, Inc. Ink jet printing apparatus having redundant nozzles
EP1707376A2 (fr) 2005-03-31 2006-10-04 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif à jet d'encre avec dégazage d'encre
US20140263701A1 (en) * 2011-03-31 2014-09-18 Hewlett-Packard Development Company, Lp. Fluidic devices, bubble generators and fluid control methods
CN104943365A (zh) * 2014-03-26 2015-09-30 精工爱普生株式会社 喷墨打印机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10272782A (ja) * 1997-03-31 1998-10-13 Brother Ind Ltd インクジェット記録装置
EP2701917B1 (fr) 2011-04-29 2019-04-10 Hewlett-Packard Development Company, L.P. Systèmes et procédés de dégazage de fluide
WO2015190200A1 (fr) * 2014-06-12 2015-12-17 コニカミノルタ株式会社 Dispositif de désaération et appareil d'impression par jet d'encre

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE2441496B1 (de) * 1974-08-30 1976-01-22 Olympia Werke Ag, 2940 Wilhelmshaven Tintentröpfchen-Drucker
JPS55128463A (en) * 1979-03-27 1980-10-04 Ricoh Co Ltd Device for facilitating removal of air bubble
WO1983004005A1 (fr) * 1982-05-12 1983-11-24 Ncr Corporation Imprimante a jet d'encre
JPS63147652A (ja) * 1986-12-10 1988-06-20 Nec Corp インクジエツト記録装置
JPH021324A (ja) * 1988-06-08 1990-01-05 Fujitsu Ltd インクジェットプリンタ

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Publication number Priority date Publication date Assignee Title
DE2441496B1 (de) * 1974-08-30 1976-01-22 Olympia Werke Ag, 2940 Wilhelmshaven Tintentröpfchen-Drucker
JPS55128463A (en) * 1979-03-27 1980-10-04 Ricoh Co Ltd Device for facilitating removal of air bubble
WO1983004005A1 (fr) * 1982-05-12 1983-11-24 Ncr Corporation Imprimante a jet d'encre
JPS63147652A (ja) * 1986-12-10 1988-06-20 Nec Corp インクジエツト記録装置
JPH021324A (ja) * 1988-06-08 1990-01-05 Fujitsu Ltd インクジェットプリンタ

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Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 179 (M - 046) 11 December 1980 (1980-12-11) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 404 (M - 757) 26 October 1988 (1988-10-26) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 132 (M - 0948) 13 March 1990 (1990-03-13) *
PATENT ABSTRACTS OF JAPAN vol. 4, no. 105 (M - 23)<587> 26 July 1980 (1980-07-26) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5984455A (en) * 1997-11-04 1999-11-16 Lexmark International, Inc. Ink jet printing apparatus having primary and secondary nozzles
US6017112A (en) * 1997-11-04 2000-01-25 Lexmark International, Inc. Ink jet printing apparatus having a print cartridge with primary and secondary nozzles
US6076910A (en) * 1997-11-04 2000-06-20 Lexmark International, Inc. Ink jet printing apparatus having redundant nozzles
EP0953447A2 (fr) * 1998-04-30 1999-11-03 Hewlett-Packard Company Conception d'écoulement de l'encre pour obtenir une meilleure évacuation de la chaleur d'une tête d'impression à jet d'encre et pour fournir des moyens d'accumulation d'air
EP0953447A3 (fr) * 1998-04-30 2000-11-15 Hewlett-Packard Company Conception d'écoulement de l'encre pour obtenir une meilleure évacuation de la chaleur d'une tête d'impression à jet d'encre et pour fournir des moyens d'accumulation d'air
EP1707376A2 (fr) 2005-03-31 2006-10-04 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif à jet d'encre avec dégazage d'encre
US7401908B2 (en) 2005-03-31 2008-07-22 Heidelberger Druckmaschinen Ag Ink jet device with ink deaerator
US20140263701A1 (en) * 2011-03-31 2014-09-18 Hewlett-Packard Development Company, Lp. Fluidic devices, bubble generators and fluid control methods
US9457368B2 (en) * 2011-03-31 2016-10-04 Hewlett-Packard Development Company, L.P. Fluidic devices, bubble generators and fluid control methods
CN104943365A (zh) * 2014-03-26 2015-09-30 精工爱普生株式会社 喷墨打印机

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