EP0873871A2 - Tête d'impression à jet d'encre thermique adaptée aux encres visqueuses - Google Patents

Tête d'impression à jet d'encre thermique adaptée aux encres visqueuses Download PDF

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Publication number
EP0873871A2
EP0873871A2 EP98302015A EP98302015A EP0873871A2 EP 0873871 A2 EP0873871 A2 EP 0873871A2 EP 98302015 A EP98302015 A EP 98302015A EP 98302015 A EP98302015 A EP 98302015A EP 0873871 A2 EP0873871 A2 EP 0873871A2
Authority
EP
European Patent Office
Prior art keywords
channel
cross
sectional area
heating
heating portion
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Withdrawn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
EP98302015A
Other languages
German (de)
English (en)
Other versions
EP0873871A3 (fr
Inventor
David A. Mantell
James F. O'neill
Narayan V. Deshpande
Eric Peeters
Reinhold E. Drews
Dale R. Ims
Constance J. Thornton
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of EP0873871A2 publication Critical patent/EP0873871A2/fr
Publication of EP0873871A3 publication Critical patent/EP0873871A3/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Withdrawn legal-status Critical Current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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14032—Structure of the pressure chamber
    • B41J2/1404—Geometrical characteristics
    • 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
    • B41J2002/14379—Edge shooter
    • 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
    • B41J2002/14387—Front shooter

Definitions

  • the present invention relates to a printhead for a thermal ink-jet printer, in which the fluid flow channel of each ejector is specially shaped for optimal performance, particularly in ejecting liquid inks of greater than 2 centipoise viscosity.
  • droplets of ink are selectably ejected from a plurality of drop ejectors in a printhead.
  • the ejectors are operated in accordance with digital instructions to create a desired image on a print sheet moving relative to the printhead.
  • the ejectors typically comprise capillary channels, or other ink passageways, which are connected to one or more common ink supply manifolds. Ink is retained within each channel until, in response to an appropriate digital signal, the ink in the channel is rapidly heated by a heating element disposed on a surface within the channel. This rapid vaporization of the ink adjacent the channel creates a bubble which causes a quantity of liquid ink to be ejected through an opening associated with the channel to the print sheet. The process of rapid vaporization creating a bubble is generally known as "nucleation.”
  • the volume of the cavity around the heating element is relatively large, with narrower portions to the front and the rear of the heating element.
  • the narrow portion in the nozzle region limits the volume of the drop which is pushed out of the ejector, prevents ingestion of air into the cavity, and provides a capillary force for rapid refill after a droplet of ink is ejected.
  • the narrow portion on the manifold (ink-supply) side contains the bubble formed over the heating element, limits the backward flow of ink during and after nucleation, and dampens the ink refill to prevent ink from bulging out the nozzle once the cavity is refilled.
  • US-A-4,368,477 discloses an ink-jet printhead in which individual ejectors are each provided with a diagonally-extending ink duct. The downstream end of each duct is formed with a wedge-shaped tapered portion, each having a leading edge wall carrying a discharge orifice for ink droplets.
  • US-A-4,550,326 discloses a nozzle plate for a "roofshooter" printhead in which, as shown in Figures 8A and 8B, the orifices are tapered in front of the ink meniscus.
  • US-A-4,675,693 discloses an ink-jet printhead in which the minimum cross-sectional area of a "discharge port" is optimized with respect to the volume of the droplets intended to be discharged.
  • US-A-5,041,844 discloses a thermal ink-jet printhead having a channel geometry that controls the location of the bubble collapse on the heating elements.
  • the heating elements are located in a pit, and the channel portion upstream from the heating element has a length and cross-sectional flow area that is adjusted relative to the channel portion downstream from the heating element, so that the upstream and downstream portions of the channel have substantially equal ink flow impedances.
  • US-A-5,148,192 and US-A-5,371,528 discloses a thermal ink-jet printhead in which each ejector has a channel which includes one portion, between the heating element and the orifice through which ink is ejected onto the sheet, which tapers outwardly toward the orifice, and a second portion, immediately adjacent the orifice, which tapers inwardly toward the orifice.
  • US-A-5,361,087 discloses a thermal ink-jet printhead in which, for each ejector, the orifice through which ink is ejected onto the sheet is of trapezoidal cross-section, and tapers in cross-section toward the opening thereof.
  • US-A-5,552,813 shows a design of a ink jet head which is intended specifically to minimize effects of viscous drag on droplet ejection.
  • a plurality of pressure chambers are arranged in a circle around an array of nozzles.
  • the nozzles are arranged in a zig-zag form, and firing control of the ejectors is adapted accordingly.
  • JP-A-06320731 discloses a baseplate for "liquid passages" in which channels etched into the surface of the baseplate include a special section of the channel which is greater in cross section than the remainder of the channel, such as near a nozzle.
  • US patent 4,994,826 discloses one proposed design of a "side-shooter” thermal ink-jet printhead.
  • a simplified rendering of the basic printhead design shown in this patent is hereshown as Figure 1.
  • the individual ejectors in the printhead are formed essentially along the abutment between a "heater chip,” here indicated in Figure 1 as 10, and a "channel plate,” indicated here in Figure 1 as 12.
  • a manifold 52 for each ejector in the prior art printhead of Figure 1, there is disposed in the channel plate 12 two cavities, a manifold 52 and a channel 54. Within the channel plate 12 itself, the manifold 52 and the channel 54 are not directly connected to each other; rather, as shown in Figure 1, the manifold 52 communicates with channel 54 via a recess, here indicated as 56, which is disposed in the thick-film insulative layer 50. Within the channel 54 of each ejector in the printhead, there is disposed a heating element 60 which is operatively attached through circuitry, the general structure of which is indicated as 58, to a source of voltage. As with any thermal ink-jet printhead, application of voltage to heating element 60 causes the desired nucleation of adjacent liquid ink, in this case the liquid ink maintained at any time within cannel 54 of a particular ejector.
  • the particular structure of the prior art printhead in Figure 1 shows the heating element 60 disposed within a "pit" within channel 54, and that the actual nozzle 62, out of which liquid ink is ejected is within the same plane as the thick film insulative layer 58.
  • the overall purpose of this structure, as described in the referenced patent, is to minimize the fluidic effects of back-pressure as the ink nucleates against ink in the manifold 52, and also prevent ingestion of outside air through nozzle 62 immediately following each ejection.
  • the printhead structure is dependent on the thick-film insulative layer 50, which is typically made of a material such as polyimide, sandwiched between the main planes of the heater chip 10 and the channel plate 12.
  • an ink-jet printing apparatus having at least one ejector, the ejector comprising a structure defining a channel adapted for flow of liquid ink therethrough and a heating element disposed within the channel.
  • the channel includes a heating portion directly adjacent the heating element, a nozzle portion adjacent a first end of the heating portion along the channel, and a manifold portion adjacent a second end of the heating portion along the channel.
  • the nozzle portion has a cross-sectional area smaller than a cross-sectional area of the heating portion, and the manifold portion has a cross-sectional area greater than the cross-sectional area of the heating portion.
  • an ink jet printing apparatus comprising a heater chip defining a planar main surface, the heater chip including a selectably actuable heating element on the main surface, and a channel plate directly abutting the main surface of the heater chip.
  • a channel is defined in the channel plate, extending along an axis.
  • the channel includes a heating portion directly adjacent the heating element, a nozzle portion adjacent a first end of the heating portion along the axis, and a manifold portion adjacent a second end of the heating portion along the axis.
  • the nozzle portion has a cross-sectional area smaller than a cross-sectional area of the heating portion, and the manifold portion has a cross-sectional area greater than the cross-sectional area of the heating portion.
  • the channel plate is made of a single piece of material.
  • An ejector includes a structure defining a channel, and a heating element disposed within the channel.
  • the channel includes a heating portion directly adjacent the heating element, a nozzle portion adjacent a first end of the heating portion along the channel, the nozzle portion having a cross-sectional area smaller than a cross-sectional area of the heating portion, and a manifold portion adjacent a second end of the heating portion along the channel, the manifold portion having a cross-sectional area greater than the cross-sectional area of the heating portion.
  • Liquid ink of a viscosity greater than 2 centipoise at operating temperature is supplied into the channel.
  • the heating element is actuated to nucleate liquid ink in the channel and cause a quantity of liquid ink to be ejected from the nozzle portion, this actuating step occurring more than 20,000 times per second.
  • the present invention describes an ejector design in which the manifold side of the ejector cavity is considerably wider than the portion around the heating element, providing little physical restriction on the ink on the manifold side.
  • the function of the usual restriction on the manifold side is provided by a combination of a narrowed nozzle portion and the viscosity of the ink itself. This "open" geometry provides a rapid refill after nucleation, which is aided by the collapse of the vapor bubble.
  • Figure 2A is a sectional elevational view
  • Figure 2B is a sectional plan view, of a cavity forming a single ejector in an ink-jet printhead according to one embodiment of the present invention.
  • the ejector includes a channel which is formed at the abutment of a main, planar surface of a heater chip 10 and a channel plate 12.
  • the main surface of heater chip 10 is substantially planar
  • disposed within the planar main surface of heater chip 10 is a heating element 60 a general design of which will be known in the art, which is in turn connected to a source of selectably-actuable voltage (not shown).
  • the heating element 60 in each ejector is disposed immediately adjacent what shall here be called a "heating portion" of a channel formed in channel plate 12, which is here indicated as 20.
  • nozzle portion 22 Immediately adjacent the heating portion of the channel in channel plate 12 is a smaller channel, which is here called a nozzle portion 22, and, at the opposite end of heating portion 60 is a larger cavity made in channel plate 12, which is here called a manifold portion 24. It will be seen, from the Figures, that manifold portion 24, heating portion 20, and nozzle portion 22 together form a channel with the cross-sectional area of the large cavity formed in channel plate 12 becoming progressively smaller in cross-sectional area from the manifold portion 24 through heating portion 20 and finally to nozzle portion 22.
  • Figure 3 is a perspective view of a single ejector such as shown in Figures 2A and 2B. Outlined in dotted lines in Figure 3 is the shape of a single cavity which, according to a preferred embodiment of the present invention, is formed in channel plate 12 for each ejector. According to one embodiment of the present invention, the nozzle portion 22, heating portion 20, and manifold portion 24 are formed as cavities in channel plate 12, which is a single, monolithic piece of silicon for a larger number of ejectors in a printhead.
  • the nozzle portion 22 and the heating portion 20 are generally triangular in shape when viewed in cross-section perpendicular to the axis of fluid flow, with one side of the triangle being formed by the main planar surface of heater chip 10, and the other two sides of the triangle being formed by the ⁇ 111> plane of the crystal structure of the silicon forming channel plate 12.
  • Such a structure as shown in Figure 3 can be obtained through orientation-dependent etching of silicon.
  • the exposed plane of the silicon forming channel plate 12 is typically substantially the ⁇ 210> plane of the silicon.
  • manifold portion 24 can be formed from the ⁇ 111> planes of channel plate 12 as well, with the junction 23 therebetween formed at least partially by ⁇ 210> planes as well. It is also conceivable to provide a channel plate 12 of a desired configuration of a plastic material; it is generally desirable, whatever material is used for the channel plate, to make the effective portions thereof defining the various portions of the ejector of a single piece of material.
  • junctions 21 and 23 between the heating portion 20 and the nozzle portion 22 and manifold portion 24 preferably create distinct "steps," or transition regions, in the decreasing cross-section of the channel along the axis from the ink supply to the nozzle portion 22; these steps should be distinguished from designs in which the cross-section of the channel from a manifold portion to a nozzle decreases continuously. Nonetheless, at the steps 21 and 23 between the heating portion 20 and the nozzle portion 22 and manifold portion 24, the channel may be tapered, as shown in Figure 3, so as to avoid undesirable sources of flow impedance which may be caused by abrupt changes in cross-sectional area.
  • the nozzle portion 22 should be significantly smaller in all dimensions than the heating portion 20.
  • a preferred length of the heating portion 20 along the axis is from 60 to 200 micrometers, including the length taken up by the step 21 between the nozzle portion 22 and heating portion 20.
  • a preferred range of lengths from the front opening of nozzle portion 22 (i.e., the front face of the printhead) and the front edge of the heating element 60 is 40-70 micrometers.
  • Corresponding preferred lengths along the axis of the heating element 60 range from 25 to 100 micrometers.
  • a preferred cross-sectional width for the nozzle portion 22 is between 10 and 20 micrometers, while a corresponding preferred range of cross-sectional widths of the heating portion 20 is 20 to 30 micrometers; given particular cross-sectional shapes of the heating portion 20 and nozzle portion 22 and given that each portion may taper somewhat along the length of the channel, the cross-sectional area of the bulk of the heating portion 20 should be generally at least twice that of the bulk of the nozzle portion 20.
  • these ranges of relative dimensions within the cavity forming the ejector have been found to be useful for ejecting liquid inks of relatively high viscosity, in particular, viscosities in excess of 2 centipoise for ink immediately adjacent the heating element 60 at normal operating temperatures just before ejection.
  • the above-described relative dimensions are useful in ejecting ink of approximately 3.5 centipoise at operating temperature, though reasonably satisfactory results can be obtained with viscosities up to 12 centipoise.
  • the above-described dimensions for a 600 dpi printhead could be scaled to obtain printheads for other resolutions, such as 300 dpi.
  • a key practical advantage of the printhead design of the present invention is that the relative sizes of the manifold portion 24, heating portion 20, and nozzle portion 22 reduce many of the performance difficulties which arise when liquid ink is attempted to be ejected from the ejector at high frequencies.
  • a key functional limitation to any thermal ink-jet printhead design is the speed at which an ejector can re-fill with liquid ink from an ink supply manifold immediately after the ejection of a droplet through the nozzle.
  • the combination of a relatively narrow nozzle portion 22 and a relatively "open" manifold portion 24 facilitates a high speed of re-fill of liquid ink into heating portion 20 immediately after a nucleated vapor bubble collapses within the heating portion 20.
  • an ejector according to the present invention is capable of accurately producing discrete ink droplets of small drop volumes and at high operating frequencies.
  • an ejector With cavity dimensions in the above-described ranges, and using liquid ink of a viscosity of more than 2 centipoise or preferably 3.5 centipoise, an ejector can consistently eject droplets at a rate in excess of 20,000 ejections per second without the failures caused by, for example, ingestion of air into the nozzle portion 22 or insufficient liquid ink being supplied through manifold portion 24.
  • Figure 4A is a sectional elevational view
  • Figure 4B is a sectional plan view of a cavity forming a single ejector in an ink-jet printhead according to another embodiment of the present invention based on a "top shooter" type ink jet geometry.
  • the ejector includes a nozzle portion 22 which is directly above the heating element 60, a heating portion 20 around the heater, and a manifold portion 24 which is connected to an ink supply (not shown).
  • the heating portion 20 is not restricted but is of constant cross section until the transition region 23 which expands to meet the manifold portion 24, as shown in Figure 4B.
  • this design provides a large opening to the manifold region which serves to provide the maximum possible refill capability.
  • the dampening of the refill is provided by the viscosity of the ink rather than by a restriction in the back channel.
  • Figure 5 shows an alternate embodiment of a general shape of an ejector according to the present invention, in which there is provided, between heating portion 20 and manifold portion 24, a constriction indicated as 30.
  • the cross-section of the constriction is smaller than the overall cross-section of the heating portion 20.
  • Such a constriction may have a desirable effect of reducing vibrational "cross-talk" among adjacent ejectors in a printhead array, which is ordinarily caused by the back-pressure of an expanding vapor bubble from one ejector increasing pressure within an ink manifold shared by multiple ejectors.
  • the constriction 30 should create a cross-sectional area in the channel which is less than 20%, and preferably less than 10%, smaller than the cross-sectional area of an immediately adjacent portion of the heating portion 20.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP98302015A 1997-03-27 1998-03-18 Tête d'impression à jet d'encre thermique adaptée aux encres visqueuses Withdrawn EP0873871A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82632497P 1997-03-27 1997-03-27
US826324 1997-03-27

Publications (2)

Publication Number Publication Date
EP0873871A2 true EP0873871A2 (fr) 1998-10-28
EP0873871A3 EP0873871A3 (fr) 1999-08-18

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EP98302015A Withdrawn EP0873871A3 (fr) 1997-03-27 1998-03-18 Tête d'impression à jet d'encre thermique adaptée aux encres visqueuses

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EP (1) EP0873871A3 (fr)
JP (1) JPH10264393A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009166242A (ja) * 2007-01-12 2009-07-30 Seiko Epson Corp 液体噴射ヘッド及びこれを有する液体噴射装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368477A (en) 1980-05-23 1983-01-11 Siemens Aktiengesellschaft Arrangement for a printing head in ink mosaic printing devices
US4550326A (en) 1983-05-02 1985-10-29 Hewlett-Packard Company Fluidic tuning of impulse jet devices using passive orifices
US4675693A (en) 1983-01-28 1987-06-23 Canon Kabushiki Kaisha Liquid injection recording method in which the liquid droplet volume has a predetermined relationship to the area of the liquid discharge port
US5041844A (en) 1990-07-02 1991-08-20 Xerox Corporation Thermal ink jet printhead with location control of bubble collapse
US5148192A (en) 1989-09-18 1992-09-15 Canon Kabushiki Kaisha Liquid jet recording head with nonlinear liquid passages and liquid jet recording apparatus having same
US5361087A (en) 1991-01-18 1994-11-01 Canon Kabushiki Kaisha Liquid jet unit with orifices and recording apparatus using the same
US5552813A (en) 1992-03-11 1996-09-03 Rohm Co., Ltd. Ink jet head with nozzle arrangement to reduce viscous drag

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4882595A (en) * 1987-10-30 1989-11-21 Hewlett-Packard Company Hydraulically tuned channel architecture
EP0578329B1 (fr) * 1989-09-18 1996-03-13 Canon Kabushiki Kaisha Tête d'enregistrement à jet d'encre et appareil à jet d'encre ayant celle-ci
CA2025558C (fr) * 1989-09-18 1996-01-02 Makiko Kimura Appareil a jet d'encre
JPH04232752A (ja) * 1990-06-24 1992-08-21 Lexmark Internatl Inc インクジエツト・プリントヘツド及びインクジエツトのプリント方法
ATE179655T1 (de) * 1991-01-17 1999-05-15 Canon Kk Tintenstrahlkopf
EP0686506B1 (fr) * 1991-01-18 2003-08-27 Canon Kabushiki Kaisha Méthode d'enregistrement à jet d'encre et appareil utilisant l'énergie thermique
ATE144192T1 (de) * 1991-03-20 1996-11-15 Canon Kk Flüssigkeitsstrahlaufzeichnungskopf und flüssigkeitsstrahlaufzeichnungsgerät, welches diesen aufweist
JPH06320731A (ja) * 1993-05-17 1994-11-22 Ricoh Co Ltd サーマルインクジェットヘッド及びその流路基板作製方法
JP2887836B2 (ja) * 1995-04-27 1999-05-10 富士ゼロックス株式会社 インクジェットプリントヘッドおよび画像記録装置
JP3408060B2 (ja) * 1995-09-22 2003-05-19 キヤノン株式会社 液体吐出方法および装置とこれらに用いられる液体吐出ヘッド

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4368477A (en) 1980-05-23 1983-01-11 Siemens Aktiengesellschaft Arrangement for a printing head in ink mosaic printing devices
US4675693A (en) 1983-01-28 1987-06-23 Canon Kabushiki Kaisha Liquid injection recording method in which the liquid droplet volume has a predetermined relationship to the area of the liquid discharge port
US4550326A (en) 1983-05-02 1985-10-29 Hewlett-Packard Company Fluidic tuning of impulse jet devices using passive orifices
US5148192A (en) 1989-09-18 1992-09-15 Canon Kabushiki Kaisha Liquid jet recording head with nonlinear liquid passages and liquid jet recording apparatus having same
US5371528A (en) 1989-09-18 1994-12-06 Canon Kabushiki Kaisha Liquid jet head with nonlinear liquid passages having a diverging portion
US5041844A (en) 1990-07-02 1991-08-20 Xerox Corporation Thermal ink jet printhead with location control of bubble collapse
US5361087A (en) 1991-01-18 1994-11-01 Canon Kabushiki Kaisha Liquid jet unit with orifices and recording apparatus using the same
US5552813A (en) 1992-03-11 1996-09-03 Rohm Co., Ltd. Ink jet head with nozzle arrangement to reduce viscous drag

Also Published As

Publication number Publication date
JPH10264393A (ja) 1998-10-06
EP0873871A3 (fr) 1999-08-18

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