EP0314486A2 - Hydraulisch abgestimmte Kanalbauart - Google Patents

Hydraulisch abgestimmte Kanalbauart Download PDF

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Publication number
EP0314486A2
EP0314486A2 EP88310139A EP88310139A EP0314486A2 EP 0314486 A2 EP0314486 A2 EP 0314486A2 EP 88310139 A EP88310139 A EP 88310139A EP 88310139 A EP88310139 A EP 88310139A EP 0314486 A2 EP0314486 A2 EP 0314486A2
Authority
EP
European Patent Office
Prior art keywords
ink
channel
printhead
feed channel
nozzle
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Withdrawn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
EP88310139A
Other languages
English (en)
French (fr)
Other versions
EP0314486A3 (de
Inventor
Kenneth E. Trueba
William R. Knight
Niels J. Nielsen
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 EP0314486A2 publication Critical patent/EP0314486A2/de
Publication of EP0314486A3 publication Critical patent/EP0314486A3/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Withdrawn legal-status Critical Current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
    • 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
    • B41J2/015—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
    • B41J2/05—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers produced by the application of heat
    • 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
    • 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 ink-jet printers, and, more particularly, to a structure for controlling fluid refill of firing chambers, minimizing meniscus travel and minimizing cross-talk between adjacent noz­zles in the printhead used to fire droplets of ink toward a print medium.
  • any providently designed ink-jet printhead must include some features to accomplish decoupling between the nozzles and the common ink sup­ply plenum so that the plenum does not supply a cross-­talk path between neighboring nozzles.
  • Resistive decoupling uses the fluid friction pres­ent in the ink feed channels as a means of dissipating the energy content of the cross-talk surges, thereby preventing the dynamics of any single meniscus from being strongly felt by its nearest neighbors. In the prior art, this is typically implemented by making the ink feed channels longer or smaller in cross-section than the main supply plenum. While these are simple solutions, they have several drawbacks. First, such solutions rely upon fluid motion to generate the pres­ sure drops associated with the energy dissipation; as such, they can only attenuate the cross-talk surges, not completely block them. Thus, some cross-talk "leakages" will always be present.
  • any attempt to shut off cross-talk completely by these methods will necessarily restrict the refill rate of the nozzles, thereby compromising the maximum rate at which the printhead can print.
  • the resistive decoupling techniques as practiced in the prior art add to the inertia of the fluid refill channel, which has serious implications for the printhead performance (as will be explained at the end of the inertial decoupling exposi­tion which follows shortly).
  • the feed channels are made as long and slender as possible, thereby maximizing the inertial aspect of the fluid entrained within them.
  • the inertia of the fluid "clamps" its ability to re­spond to cross-talk surges in proportion to the sudden­ness of the surge and thereby inhibits the transmission of cross-talk pulses into or out of the ink feed chan­ nel. While this decoupling scheme is used in the prior art, it requires considerable area (“real estate") within the print head to implement, making a compact structure impossible.
  • the resistive component of a pipe having a rectangular cross-section scales directly with length and inversely with the third power of the smaller of the two cross-section dimensions, the flow resistance can grow to an unac­ceptable level, compromising refill speed. More impor strictlytantly, however, are the dynamic effects caused by the coupling of this inertance to the compliance of the nozzle meniscus, as will be discussed below.
  • Capacity decoupling has been proven effective at droplet ejection frequencies below that corresponding to the resonant frequency of the nozzle meniscus cou­pled to the feed channel inertia.
  • its imple­mentation at frequencies near meniscus resonance is also complicated by interactive effects.
  • the isolator orifice acts as a low impedance shunt path for high frequency surges.
  • the high frequency impedance of an ink feed channel terminated at its plenum end with an isolator orifice will be lower than an equivalent channel without an isolator. This means that during the bubble growth phase, blow-back flow away from the nozzle is increased by the isolator ori­fice.
  • the two-orifice system will thus resonate at a higher frequency, which is a benefit from a settling time point of view, but the energy stored in the resonating system still needs to be dissipated and therefore constrictive damping will be necessary in such an implementation. While the effects of these resonances is poorly understood at this time, the efficiency decrease may be severe enough to prevent the printhead from working.
  • an ink jet printhead comprising a plurality of ink propelling elements and a plurality of nozzles associated therewith for firing a quantity of ink toward a print medium, wherein ink is supplied to an ink propelling element from a plenum chamber by means of an ink feed channel characterised in that there is at least one constriction in the ink feed channel.
  • a localized constriction (also referred to as a lumped resistance element) is introduced into the feed channel connecting each nozzle's firing chamber with the main ink supply plenum.
  • a localized constriction also referred to as a lumped resistance element.
  • the fact that the resistive aspect of each nozzle is localized permits these constrictions to be useful in cross-talk control, since then quantity of inertia they introduce into the feed channels is minimal.
  • This overcomes the aforementioned problem of parasitic inertance present in the prior art in which the resistive aspect is distributed along, and thereby scales directly with, the length of the feed channel.
  • the use of lumped resistance elements allow the printhead designer to vary the relative amounts of resistance and inertance present in the feed channel substantially independently of each other and thereby "tune" the feed channel for an optimum combination of inertance and resistance.
  • the lumped resistance element comprises a pinch point between two opposed projections in the ink feed side walls. Since these feed walls are commonly patterned in photoresist, the pinch points are easily implemented by including them in the photomask which defines the ink feed channel geometries. The degree of "pinch” possible is sensitively determined by the photochemical characteristics of the resist film. In practical terms, when using commerically common resist films and light sources, the ratio of film thickness (i.e., wall height) to pinch width ranges up to about 1.2.
  • another embodiment comprises one or more sharp bends in the ink feed channel.
  • Each sharp bend acts as a lumped resistive element to gener­ate a pressure drop equivalent to that present in an equivalent length of ink feed channel of from about 5D to 10D, where D is the cross-sectional dimension of the channel.
  • This resistive enhancement is accomplished without a proportional increase in the inertia of the feed channel, and without violating the height-to-width limits of the film.
  • This concatenation of serial lumped resistive elements is applicable in principle to the pinch point embodiment as well, although care must be exercised to avoid including any features which might behave as bubble traps or interfere with photore­sist development and subsequent washing.
  • the ink-propelling element (resistive heating element, piezoelectric element, etc.) is placed below the level of the feed channel, again introducing a sharp bend in the ink feed channel.
  • a pinch point is intro­duced into the feed channel by partially obstructing the channel with a dike or "speed bump" lying across the width of the channel.
  • This feature can be photo­lithographically defined and deposited upon the print­ head substrate using a film thinner than that used to form the side walls, or it may be affixed to the under­side of the orifice plate which forms the "ceiling" of the ink feed channel.
  • the dike can con­sist either of photoresist film or of electrodeposited metal.
  • the electrodeposition can be an operation separate from that used to create the orifice plate, or, in the case of electroformed orifice plates, it can be an integral part of the elec­troforming process. It is also possible in principle to electrodeposit a metallic dike onto the printhead substrate, provided that the substrate is compatible with the electrodeposition baths.
  • lumped resistive elements can be used singly or in combination with elements of the same or of dif­ferent types, depending on the details of the applica­tion and are not strictly limited to the shapes, mate­rials, and layouts offered above as examples.
  • novel printhead structures of the invention accomplish both (1) isolation of any given nozzle from its neighbors, i.e., cross-talk reduction, and (2) reduced oscillation of the meniscus caused by refill dynamics in any individual nozzle. This prevents me­niscus displacements from interfering with the ejection of subsequently fired droplets, while limiting the severity of any side effects incurred in the implemen­tation of the desired structure.
  • the new printhead structures have the additional advantage of being easy to implement and easy to "tune" for maximum effective­ness. These structures are directly applicable across the full range of ink-jet printheads.
  • an ink feed channel 10 is shown, with a resistor 12 situ­ated at one end 10a thereof.
  • Ink (not shown) is intro­duced at the opposite end 10b thereof, as indicated by arrow "A", from a plenum, indicated generally at 14.
  • a nozzle 16 (such as seen in FIG. 3b), located above the resistor 12. Drop­lets of ink are ejected through the nozzle (i.e., nor­nal to the plane of FIG. 1) upon heating of a quantity of ink by the resistor 12.
  • the invention is preferably directed to improving the operation of thermal ink-jet printheads, which employ resistors 12 as elements used to propel droplets of ink toward a print medium, such as paper
  • a print medium such as paper
  • teachings of the invention are suitably employed to improve the operation of ink-jet printheads in general.
  • Examples of other types of ink-jet print­heads benefited by the teachings of the invention include piezoelectric, which employ a piezoelectric element to propel droplets of ink toward the print medium.
  • the straight channel 10 does not permit facile damping of the ink.
  • damping of the meniscus of ink in the active nozzle takes more than 400 ⁇ sec (Curve 16).
  • the meniscus of ink in a neighboring nozzle is adversely affected by the action of the meniscus of ink in the active nozzle (Curve 20).
  • a localized constriction 22 (also referred to as a lumped resis­tance element) is introduced into the feed channel connecting each nozzle's firing chamber with the main ink supply plenum.
  • the localized construction 22 may comprise a sharp bend or a pair of opposed projections, and one or more such constrictions may be present in various combinations.
  • a pair of opposed projections 24, depicted in FIG. 3a, is employed alone or in conjunc­tion with locating the resistor 12 below the floor 26 (indicated by the dashed lines) of the channel 10, as seen in FIG. 3b.
  • the length of the channel 10 ranges from close to the resistor to about 60 ⁇ m.
  • the height of the channel 10 ranges from about 15 to 30 ⁇ m, while the width of the channel ranges from about 20 to 40 ⁇ m.
  • the considerations that govern the channel dimen­sions relate to the amount of ink that has to be re­placed after each firing. This amount is the sum of the quantity of ink that is ejected out through the nozzle 16 plus the quantity of ink that moves back through the feed channel. The latter quantity is re­ ferred to as the blow-back, and is desirably as small as possible.
  • the shape of the projections 24 in the area of the opening 10a can contribute to the optimization of re­fill and damping.
  • the projections can be sharp, as shown in FIG. 3a, or rounded, as shown in FIG. 3c.
  • the radius R of the rounding may range from about 5 to 10 ⁇ m.
  • the configuration of the projections 24 affects turbulent flow of the ink in the vicinity thereof.
  • sharper corners increase the turbulence, thus leading to higher resistance, in the ink feed channel 10 during the bubble growth phase. This re­duces blow-back and decreases refill time.
  • blow-back can be mini­mized by constricting the opening to the channel 10 with the opposed projections 24, by constricting the channel (such as providing a "speed bump" 32 across the junction of the channel and the firing chamber on the floor 26′ thereof (FIG. 3b), by placing the resistor 12 in a well below the level of the refill channel (as alternately depicted in FIG. 3b), or by introducing bends 22 in the ink feed channel.
  • the speed bump 32 it may be placed on the floor or the ceiling, partially or fully extending across the width of the channel 10.
  • the invention contemplates placement of one or more constrictions 22, 24, whether employing projections or one or more sharp bends in the ink feed channel 10, between the plenum 14 and the nozzle 16.
  • Each sharp bend 22 introduces a pressure drop equivalent to that generated by an equivalent length of ink feed channel 10 of from about 5d to 10d, where d is the cross-sectional dimension of the chan­nel, without introducing the inertia enhancement ef­fect. This is because the resistance enhancement swamps out and overwhelms the inertia change.
  • the lengthening of the channel 10, depicted in FIG. 1 is avoided by adding one or more constrictions 22, 24 therein.
  • the sharp bends may be introduced by setting the resistor 12 below the channel 10 or by adding a speed bump 32 across the floor 26′ or ceiling of the channel.
  • one or more sharp bends 22 may be introduced in the channel 10.
  • FIG. 5 depicts two constrictions, one at 22a and the other at 22b.
  • FIGS. 6 and 7 depict yet additional embodiments, such as opposed projections 24 (FIG. 6) or a free-standing pillar 22′ in lieu of a speed bump 32 (FIG. 7).
  • the constricted feed channel or the labyrinth feed channel can be introduced into the printhead architec­ture without lengthening the feed channel structure and without revising the orifice plate with the addition of isolator orifices.
  • the mass "seen" by the nozzle meniscus as it os­cillates is, for the labyrinth, predominantly the fluid mass in the firing chamber.
  • the resistance of the labyrinth ink feed channel decouples this mass from that entrained in the labyrinth.
  • lumped resistive elements in the ink feed channel to allow independent adjustment of the feed channel's resistive and inertial parameters is useful in ink-jet printer applications based on thermal and non-thermal ink-jet technologies.
  • FIG. 3a A comparison was made between a straight ink feed channel of the type depicted in FIG. 1 (prior art) and an ink feed channel of the invention as depicted in FIG. 3a.
  • the resistor was 50 ⁇ m x 50 ⁇ m square.
  • the ink feed channel was 150 ⁇ m long and 70 ⁇ wide.
  • the resistor was placed 25 ⁇ m below the bottom of the ink feed channel; the ink feed channel was 50 ⁇ m long (from the edge of the resistor to the opening to the reservoir) and had protuberances affording an opening of 35 ⁇ m wide.
  • Table I shows that the opposed projection configu­ration of the invention works because the blow-back volume is held in check.
  • the straight barrier with 150 pl drop actually has to refill 382 pl because of the excessive amount of blow-back.
  • the domi­nant contributor to fast refill is the width W provided by the opposed projections, or the amount of constric­tion.
  • the length L of the straight section should be held to a minimum, since increased length does slow refill.
  • a feed channel architecture for an ink-jet pen is provided for use in thermal ink-jet printers.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP88310139A 1987-10-30 1988-10-28 Hydraulisch abgestimmte Kanalbauart Withdrawn EP0314486A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11549887A 1987-10-30 1987-10-30
US115498 1987-10-30

Publications (2)

Publication Number Publication Date
EP0314486A2 true EP0314486A2 (de) 1989-05-03
EP0314486A3 EP0314486A3 (de) 1990-01-10

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EP88310139A Withdrawn EP0314486A3 (de) 1987-10-30 1988-10-28 Hydraulisch abgestimmte Kanalbauart

Country Status (4)

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EP (1) EP0314486A3 (de)
JP (1) JPH01152068A (de)
KR (1) KR920005741B1 (de)
CA (1) CA1300974C (de)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0461940A2 (de) * 1990-06-15 1991-12-18 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungsgerät- und steuerungsverfahren
EP0609011A2 (de) * 1993-01-25 1994-08-03 Hewlett-Packard Company Verfahren zum Herstellen eines thermischen Farbstrahldruckkopfs
EP0609012A3 (de) * 1993-01-25 1994-09-14 Hewlett-Packard Company Verfahren zum Herstellen eines thermischen Farbstrahldruckkopfs
EP0638602A1 (de) * 1993-08-09 1995-02-15 Hewlett-Packard Company Folien aus Poly-p-Xylylen zum Beschichten von Düsenplatten
US5463413A (en) * 1993-06-03 1995-10-31 Hewlett-Packard Company Internal support for top-shooter thermal ink-jet printhead
EP0691204A1 (de) * 1994-07-08 1996-01-10 Hewlett-Packard Company Abgestimmte Eingangsverzahnung für Tintenstrahldrucker
EP0694398A1 (de) * 1994-07-29 1996-01-31 Hewlett-Packard Company Tintenstrahldruckkopf mit abgestimmten Düsenkammern und mehreren Flusskanälen
US5563642A (en) * 1992-04-02 1996-10-08 Hewlett-Packard Company Inkjet printhead architecture for high speed ink firing chamber refill
EP0705706A3 (de) * 1994-10-06 1997-01-02 Hewlett Packard Co Tintenstrahldrucksystem
EP0813970A1 (de) * 1996-06-18 1997-12-29 Lexmark International, Inc. Filter für einen Tintenstrahldruckkopf
US5734399A (en) * 1995-07-11 1998-03-31 Hewlett-Packard Company Particle tolerant inkjet printhead architecture
US5909231A (en) * 1995-10-30 1999-06-01 Hewlett-Packard Co. Gas flush to eliminate residual bubbles
EP0894626A3 (de) * 1997-07-31 1999-09-01 Hewlett-Packard Company Druckkopf mit Partikelfilter
US6003986A (en) * 1994-10-06 1999-12-21 Hewlett-Packard Co. Bubble tolerant manifold design for inkjet cartridge
EP1024003A2 (de) * 1999-01-29 2000-08-02 Seiko Epson Corporation Tintenstrahldruckkopf mit verbesserten Tintenzufuhrkanälen
US6270201B1 (en) 1999-04-30 2001-08-07 Hewlett-Packard Company Ink jet drop generator and ink composition printing system for producing low ink drop weight with high frequency operation
EP1186414A2 (de) * 2000-09-06 2002-03-13 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungskopf und Verfahren zu seiner Herstellung
US6626522B2 (en) 2001-09-11 2003-09-30 Hewlett-Packard Development Company, L.P. Filtering techniques for printhead internal contamination
US6896360B2 (en) * 2002-10-31 2005-05-24 Hewlett-Packard Development Company, L.P. Barrier feature in fluid channel
EP1550557A1 (de) * 2003-12-31 2005-07-06 Hewlett-Packard Development Company, L.P. Tröpfenausstossgerät zum Ausstoss diskreter Tröpfchen
EP1551637A2 (de) * 2002-09-30 2005-07-13 Spectra, Inc. Tröpfchenausstossvorrichtung
EP1707370A1 (de) * 2005-03-31 2006-10-04 Océ-Technologies B.V. Tintenstrahldrucker
EP1609601A3 (de) * 2004-06-25 2007-05-02 Samsung Electronics Co, Ltd Tintenstrahlkopf mit Dämpfungskanal und dazugehöriges Herstellungsverfahren
EP1803571A2 (de) * 2005-12-27 2007-07-04 Samsung Electronics Co., Ltd. Tintenstrahldruckkopf
US7481517B2 (en) 2005-03-31 2009-01-27 Oce-Technologies B.V. Inkjet printer

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
DE69723368T2 (de) 1996-07-31 2004-07-01 Canon K.K. Bubble jet head and bubble jet apparatus employing the same
JP6786909B2 (ja) 2016-06-29 2020-11-18 セイコーエプソン株式会社 液体噴射ヘッド及び液体噴射装置

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DE3333980A1 (de) * 1983-09-20 1985-04-04 Siemens AG, 1000 Berlin und 8000 München Anordnung zur reduzierung der nebensprecheinfluesse in tintenschreibeinrichtungen
EP0145066A2 (de) * 1983-11-26 1985-06-19 Philips Patentverwaltung GmbH Mikroplanarer Tintenstrahldruckkopf
EP0221724A2 (de) * 1985-10-31 1987-05-13 International Business Machines Corporation Tintenstrahldruckerdüse mit einer die Haltbarkeit verbessernden Beschichtung
US4683481A (en) * 1985-12-06 1987-07-28 Hewlett-Packard Company Thermal ink jet common-slotted ink feed printhead

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0770485A3 (de) * 1990-06-15 1997-06-11 Canon Kk
EP0461940A3 (en) * 1990-06-15 1992-08-05 Canon Kabushiki Kaisha Ink jet recording apparatus and driving method therefor
US6244693B1 (en) 1990-06-15 2001-06-12 Canon Kabushiki Kaisha Ink jet recording apparatus having a flow resistance element and driving method
EP0461940A2 (de) * 1990-06-15 1991-12-18 Canon Kabushiki Kaisha Tintenstrahlaufzeichnungsgerät- und steuerungsverfahren
US6341849B1 (en) * 1990-06-15 2002-01-29 Canon Kabushiki Kaisha Ink jet recording apparatus having flow resistance elements and driving method therefor
US6439692B1 (en) 1990-06-15 2002-08-27 Canon Kabushiki Kaisha Ink jet recording apparatus and driving method thereof using a flow resistance element to promote collapse of a generated bubble
US5563642A (en) * 1992-04-02 1996-10-08 Hewlett-Packard Company Inkjet printhead architecture for high speed ink firing chamber refill
US5619236A (en) * 1992-04-02 1997-04-08 Hewlett-Packard Company Self-cooling printhead structure for inkjet printer with high density high frequency firing chambers
US5594481A (en) * 1992-04-02 1997-01-14 Hewlett-Packard Company Ink channel structure for inkjet printhead
EP0609011A2 (de) * 1993-01-25 1994-08-03 Hewlett-Packard Company Verfahren zum Herstellen eines thermischen Farbstrahldruckkopfs
EP0609011A3 (de) * 1993-01-25 1994-09-14 Hewlett-Packard Company Verfahren zum Herstellen eines thermischen Farbstrahldruckkopfs
US5441593A (en) * 1993-01-25 1995-08-15 Hewlett-Packard Corporation Fabrication of ink fill slots in thermal ink-jet printheads utilizing chemical micromachining
EP0609012A3 (de) * 1993-01-25 1994-09-14 Hewlett-Packard Company Verfahren zum Herstellen eines thermischen Farbstrahldruckkopfs
US5608436A (en) * 1993-01-25 1997-03-04 Hewlett-Packard Company Inkjet printer printhead having equalized shelf length
US5463413A (en) * 1993-06-03 1995-10-31 Hewlett-Packard Company Internal support for top-shooter thermal ink-jet printhead
EP0638602A1 (de) * 1993-08-09 1995-02-15 Hewlett-Packard Company Folien aus Poly-p-Xylylen zum Beschichten von Düsenplatten
US5426458A (en) * 1993-08-09 1995-06-20 Hewlett-Packard Corporation Poly-p-xylylene films as an orifice plate coating
US5519423A (en) * 1994-07-08 1996-05-21 Hewlett-Packard Company Tuned entrance fang configuration for ink-jet printers
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Also Published As

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KR920005741B1 (en) 1992-07-18
EP0314486A3 (de) 1990-01-10
CA1300974C (en) 1992-05-19
KR890006394A (ko) 1989-06-13
JPH01152068A (ja) 1989-06-14

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