EP0748691A2 - Système à jet d'encre - Google Patents

Système à jet d'encre Download PDF

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Publication number
EP0748691A2
EP0748691A2 EP96201578A EP96201578A EP0748691A2 EP 0748691 A2 EP0748691 A2 EP 0748691A2 EP 96201578 A EP96201578 A EP 96201578A EP 96201578 A EP96201578 A EP 96201578A EP 0748691 A2 EP0748691 A2 EP 0748691A2
Authority
EP
European Patent Office
Prior art keywords
ink
transducer
nozzle
ink channel
signal
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.)
Granted
Application number
EP96201578A
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German (de)
English (en)
Other versions
EP0748691A3 (fr
EP0748691B1 (fr
Inventor
Hans Reinten
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 Nederland 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 Nederland BV filed Critical Oce Nederland BV
Priority to EP19960201578 priority Critical patent/EP0748691B1/fr
Publication of EP0748691A2 publication Critical patent/EP0748691A2/fr
Publication of EP0748691A3 publication Critical patent/EP0748691A3/fr
Application granted granted Critical
Publication of EP0748691B1 publication Critical patent/EP0748691B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04521—Control methods or devices therefor, e.g. driver circuits, control circuits reducing number of signal lines needed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
    • 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
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics

Definitions

  • the invention relates to an ink-jet system comprising an ink channel between an ink reservoir and a nozzle, and pressurizing means arranged adjacent to the ink channel for generating in the ink liquid an acoustic pressure wave propagating in the ink channel, so that an ink droplet is expelled from the nozzle.
  • Such ink-jet systems are used as printheads in ink-jet printers.
  • a drop-on demand ink-jet system of the type indicated above is known for example from EP-B1-0 402 172.
  • the ink channel is formed in a substrate which is sandwiched between a bottom plate and a cover plate such that the top and bottom surfaces of the ink channel are formed by the cover plate and the bottom plate, respectively.
  • the ink channel has a constant depth which is identical to the height of the nozzle, but has a larger width than the nozzle and is tapered at its front end so that its width is gradually reduced to that of the nozzle.
  • the pressurizing means comprises a plate-like piezoelectric element which is disposed underneath the bottom plate within the area of the ink channel.
  • the piezoelectric element is supported on a rigid support plate and has its top end face directly engaged with the bottom plate of the ink channel.
  • an electric voltage is applied to electrodes of the piezoelectric element, the piezoelectric material expands in vertical direction, and the elastic bottom plate is flexed inwardly of the ink channel, so that an ink droplet is expelled from the nozzle.
  • the ink-jet systems In a practical print head for high-speed and high-resolution printing, a plurality of ink-jet systems are integrated on a common substrate. In order to achieve objectives like large-scale integration, a high maximum frequency of drop generation and the like, the ink-jet systems should be made as compact as possible. On the other hand, the ink jet systems should be operable with moderate voltages and must nevertheless be capable of providing a sufficient energy for creating droplets of a suitable size and accelerating them to a suitable speed so that the droplets may be deposited on the recording medium with high accuracy. It is therefore desirable to optimize the efficiency, with which the mechanical energy provided by the piezoelectric element is converted into kinetic energy of the droplet.
  • the total energy efficiency depends largely on the following two factors: (1) the efficiency with which the mechanical energy of the piezoelectric element is converted into energy of an acoustic wave propagating in the ink liquid and (2) the efficiency with which the acoustic energy is conferred to the droplet created at the nozzle.
  • the first factor is determined by the ratio between the thickness of the piezoelectric element and the depth of the ink channel. Ideally, this ratio should not be much smaller than the ratio between the elastic modules of the piezoelectric material and the ink liquid. Since the piezoelectric material generally has a comparatively large elastic module and, on the other hand, the thickness of this element is limited by practical constraints, this factor requires a rather small depth of the ink channel.
  • the second factor depends on the ratio between the sectional areas of the nozzle and the ink channel. Ideally, this ratio should be so selected that an optimal "impedance match" is provided for the acoustic wave, in order to avoid energy losses by reflection of the acoustic wave. Since the cross-section of the nozzle is determined by the desired size of the droplets and the width of the ink channel should not be made too large, a comparatively large depth of the ink channel would be desirable in view of this factor.
  • IBM Technical Disclosure Bulletin Vol. 26, No. 10B, March 1984 discloses a different type of ink-jet system in which the ink channel is defined in the interior of a tubular piezoelectric element.
  • the outer circumferential surface of the tubular piezoelectric element is surrounded by a plurality of discrete annular conducting bands which serve as energizing electrodes, so that a plurality of piezoelectric transducers are formed which are distributed over the length of the ink channel. If the excitation of each transducer is timed properly, a pressure wave traveling towards the nozzle in the ink channel will build up its energy as it passes under each transducer.
  • an ink-jet system of this type is difficult to manufacture, and it is particularly difficult to integrate a plurality of ink-jet systems of this type into a multiple-nozzle printhead for high-speed and high-resolution printing.
  • the plurality of conducting bands of each piezoelectric element in each individual ink-jet system must be energized separately, a complicated control logic is required, and the wiring system needed for applying the appropriate voltages to the individual conducting bands becomes very complex when the number of nozzles in the integrated printhead is increased.
  • this object is achieved in an ink-jet system according to the preamble of claim 1 wherein the transducers are energized by nested pulses such that the transducers sequentially arranged along the ink channel are contracted one after the other in the order from the nozzle towards the ink reservoir and are then expanded one after the other in reverse order.
  • the ink-jet system is easy to manufacture and can readily be integrated in a multiple-nozzle printhead.
  • the depth d of the ink channel is selected in view of an optimal ratio between the cross-sectional areas of the ink channel and the nozzle, whereas the ratio H/d is allowed to deviate from the theoretical optimum.
  • H/d the ratio between the cross-sectional areas of the ink channel and the nozzle
  • the use of two or more transducers creates a synergetic effect, which means that, when the voltage to be applied to the transducers is given, the kinetic energy conferred to the droplet is larger than it would be the case if the two or more transducers were replaced by a single one with the same total dimensions.
  • the reason is that the pressure bias created by the second transducer enhances the efficiency with which energy is transferred from the first transducer to the ink volume.
  • Two or more transducers are arranged along different longitudinal sections of the ink channel.
  • the transducers have to be energized at different timings so that the first transducer will perform its compression stroke when the positive (biasing) pressure wave which has been generated by the second transducer has propagated into the section of the ink channel where the first transducer is situated.
  • the depth of the ink channel is constant over the entire length.
  • the depth of the ink channel may be increased towards the nozzle.
  • the transducers located remote from the nozzle will have a high efficiency because they cooperate with a shallow section of the ink channel, whereas the transducers located closer to the nozzle will have a high efficiency because of the pressure bias of the ink volume in the associated sections of the ink channel, and the section of the ink channel immediately adjacent to the nozzle will have a large depth, as is required for minimizing the reflection losses at the nozzle.
  • the transducers are energized by nested voltage pulses, such that, when a droplet is to be generated, the transducer which is closest to the nozzle is the first to contract and the last to expand, whereas the transducer closest to the ink reservoir is the last to contract and the first to expand.
  • the transducers will perform their suction strokes successively, so that a negative pressure wave propagates from the nozzle towards the ink reservoir and is amplified each time it passes the transducer, the negative pressure wave being then reflected at the open end of the ink channel adjoining the ink reservoir, so that a reflected positive pressure wave propagates towards the nozzle and is successively amplified by the compression strokes of the transducers.
  • At least one of the transducers is energized in response to a drop demand signal, and at least one other transducer is energized periodically, i.e. irrespective of whether or not the drop demand signal is present.
  • This embodiment has the advantage that the control logic which provides the high power output signal for periodically energizing the one transducer may be simplified significantly, because this control logic does not need to respond to the drop demand signal but is only required to provide a periodic pulse signal.
  • the periodically energized transducers for all the nozzles may be powered by a common electrode or control line, so that the pattern of electric connections can be simplified significantly, which is particularly advantageous in case of a compact large-scale integrated device.
  • the object of the invention can be achieved by an ink-jet system comprising an ink channel between an ink reservoir and a nozzle, and pressurizing means arranged adjacent to the ink channel for generating in the ink liquid an acoustic pressure wave propagating in the ink channel, so that an ink droplet is expelled from the nozzle in response to a drop demand signal, wherein said pressurizing means comprise at least two electromechanical transducers energized at different timings, and at least one of said transducers is energized periodically, irrespective of the presence or absence of the drop demand signal, whereas at least one other transducer is energized in response to the drop demand signal.
  • the transducer or transducers which are energized in response to the drop demand signal may be kept silent when the drop demand signal is absent.
  • the signal applied to this transducer is also derived from a periodic pulse signal, and the polarity of this pulse signal is reversed in response to the drop demand signal.
  • the acoustic waves generated by the totality of the transducers show constructive interference in order to produce an ink droplet when the drop demand signal is present, and they show destructive interference so that no droplet is generated, when the drop demand signal is absent.
  • the acoustic wave which would be generated by the periodically energized transducer alone can have a comparatively large amplitude above the threshold level, so that a high level of acoustic energy can be achieved when the generation of a droplet is desired.
  • the electronic control logic can be simplified further because the high voltage pulse signals to be applied to all transducers can be derived from periodic signals and the only effect of the drop demand signal is to change the polarity of one of these pulse signals.
  • the timing at which the polarity is reversed in response to the drop demand signal is not critical, because the exact timings at which the transducers are actuated is determined by the pulses of the periodic signals, so that a stable drop generation can be achieved with a simple control logic.
  • FIG. 1 shows an ink-jet system in the form of an integrated multiple-nozzle printhead 10 which has a plurality of drop-generating units arranged on a common substrate 12.
  • Each drop-generating unit comprises a nozzle 14, an ink channel 16 connecting the associated nozzle to a common ink reservoir 18 and two piezoelectric elements 20, 22 which are disposed along the top side of the ink channel 16 and serve as electromechanical transducers for pressurizing the ink liquid in the ink channel 16.
  • the ink channels 16 of the individual drop generating units are formed by grooves in the top surface of the substrate 12 and are separated from one another by vertical walls (not shown).
  • the top sides of the nozzles 14 and the ink channels 16 are defined by a flexible cover plate 24.
  • the main portion of the ink channel 16 disposed below the piezoelectric elements 20, 22 has a rectangular cross-section, and the front end of the ink channel is tapered toward the nozzle 14.
  • the depth d of the ink channel 16 is larger than the height of the nozzle 14 and has been selected to provide an appropriate ratio between the cross-sectional areas of the nozzle 14 and the ink channel 16 (the width of the ink channel being limited by the pitch of the drop-genrating units).
  • the piezoelectric elements 20, 22 are formed by plate-like expansible members made of a piezoelectric material and provided with energizing electrodes 26, 28 at the top surface and a common ground electrode (not shown) at the bottom surface.
  • the piezoelectric elements 22 are preferably separated from each other and each element 22 is positioned in such a way that it covers an ink channel 16.
  • the height H of the piezoelectric elements 20, 22 is significantly larger than the depth d of the ink channel 16.
  • An upper limit for the height H is imposed by practical constraints. For example, it becomes more difficult to cut the piezoelectric element to the desired dimensions when the thickness thereof is increased.
  • the piezoelectric element 22 When a voltage is applied for example to the electrode 28, the piezoelectric element 22 will tend to expand and will exert a pressure Pp on the flexible cover plate 24 and further on the ink volume in the ink channel 16. As a result, the cover plate 24 is caused to flex downward by a certain amount X, and the volume of the ink channel 16 is reduced accordingly.
  • Figure 2A is an idealized diagram which shows how the pressure Pp exerted by the piezoelectric element and the pressure Pi of the ink liquid depends on the displacement X of the cover plate 24 (the elastic force of which is neglected).
  • the pressure Pp of the piezoelectric element starts from a comparatively high value P0 at the moment when the voltage is applied to the electrode 28 and the cover plate 24 has not yet been displaced, and then decreases linearly with the displacement x.
  • the slope of the curve Pp is given by Ep/H, wherein Ep is the elastic module of the piezoelectric material.
  • the pressure Pi of the ink liquid is initially zero and increases linearly with the displacement X, the slope being given by Ei/d, wherein Ei is the elastic module of the ink liquid.
  • the displacement of the cover plate 24 will reach a value Xe at which there exists equilibrium between the pressures Pp and Pi.
  • the mechanical work per unit area conferred to the ink liquid is represented by the hatched area W in Figure 2A.
  • Figure 2B illustrates a situation in which the ink liquid has already a certain initial pressure or bias pressure Pb. Accordingly, the curve Pi' representing the pressure of the ink liquid is shifted by the amount Pb. It is readily seen that the work W' conferred to the ink liquid (hatched area in Figure 2B) is significantly larger than in the case illustrated in Figure 2A.
  • the ink-jet system illustrated in Figure 1 takes advantage of this effect in the following manner.
  • One piezoelectric element is used for creating the initial bias pressure Pb in the section of the ink channel 16 underneath the other piezoelectric element. Then, the electrode of the other piezoelectric element is energized in order to confer a higher amount of energy (corresponding to the work W') to the ink liquid. The mechanical energy of the piezoelectric elements is thus transformed into acoustic energy with high efficiency. When the wave front of the high pressure wave propagating in the ink channel 16 reaches the nozzle 14, this energy is efficiently transformed into kinetic energy of the ink droplet, because the cross section of the ink channel 16 is so dimensioned that energy losses due to reflection of the acoustic wave at the nozzle 14 are minimized.
  • the electrode 26 which is common to the piezoelectric elements 20 of all drop generating units, is connected to a drive circuit 30, and each of the electrodes 28 is connected to another drive circuit 32 which receives a drop demand signal D.
  • FIG. 3 is a time chart illustrating exemplary wave forms of the drop demand signal D and the output signals S30 and S32 of the drive circuits 30 and 32.
  • the drive circuit 30 outputs a periodic pulse signal with a fixed period T and a certain pulse width PW1, irrespective of whether or not the drop demand signal D is present.
  • the drive circuit 32 generates a pulse signal which has the same period T.
  • the centers of the pulses of this pulse signal are identical with the centers of the pulses of the signal S30, but the pulse width PW2 of the signal S32 is only one third of the pulse width PW1.
  • the pulse of the signal S32 has the same polarity as the pulses of the signal S30, and when the drop demand signal D is absent, the pulses of the signal S32 have the opposite polarity.
  • Figure 4 symbolizes the propagation of an acoustic pressure wave in the ink channel 16 relative to the piezoelectric elements 20, 22 for each of the time points t0 - t7 indicated in Figure 3.
  • the signal S30 i.e. the voltage applied to the electrode 26 changes such that the piezoelectric elements 20 are contracted.
  • a negative pressure wave is generated below the piezoelectric element 20, as is shown in Figure 4(a). This negative pressure wave will spread in both directions.
  • the right wave front of the negative pressure wave has reached the right end of the piezoelectric element 22, i.e. the end adjacent to the ink reservoir 18.
  • the signal S32 i.e. the voltage applied to the electrode 28 of the drop generating system for which the drop demand signal D is present, is also changed so that this piezoelectric element 22 is also contracted.
  • the negative pressure wave below the piezoelectric element 22 is amplified ( Figure 4(b)).
  • the right wave front reaches the upstream end of the ink channel 16 adjoining the ink reservoir 18.
  • the negative pressure wave is reflected with a phase shift of 180, so that the reflected wave has a positive pressure.
  • the positive pressure wave has travelled into the section of the ink channel 16 below the piezoelectric element 20.
  • the signal S30 drops to zero, and the piezoelectric element 20 expands so that the positive pressure wave is amplified once more.
  • an acoustic wave carrying a high amount of energy will propagate towards the nozzle 14 and will cause the creation of the desired ink droplet.
  • the signal S34 drops to zero and the piezoelectric element 20 expands, so that the negative pressure wave is cancelled by destructive interference. Thus, no substantial pressure will be observed at the nozzle 14.
  • the system of ink in the nozzle and in particular the meniscus of the ink liquid in the nozzle 14 has a certain stability, it is not necessary that the acoustic wave is cancelled completely when the drop demand signal is absent. It is sufficient that the amplitude of the acoustic wave is reduced to such an extent that no droplet will be generated.
  • the piezoelectric element 20 provides more power than the element 22. This can be achieved by increasing the output voltage of the drive circuit 30 in comparison to the of the drive circuit 32. Since the drive circuit 32 must respond to the drop demand signal D, it will be appreciated that it is advantageous if this drive circuit can be operated at a lower voltage.
  • the piezoelectric elements 20 and 22 may have different lengths. For the reasons indicated above, it will be preferable to provide a larger length for the piezoelectric element 20. Of course, the timings of the signals S30 and S32 must be adapted to the respective lengths of the piezoelectric elements.
  • the signal S32 is a tri-state signal
  • a bi-state signal may also be employed, as is indicated by the dot-dashed line in Figure 3.
  • This modified waveform of the signal S32 may be derived from a periodic pulse signal by inverting the polarity of this periodic pulse signal in accordance with the drop demand signal D.
  • the piezoelectric element 22 will perform additional retraction and expansion strokes, for example at the time td in Figure 3. These additional strokes however are not strong enough to create an ink droplet, so that they have no adverse effect on the performance of the system.
  • the drive circuit 32 may for example be implemented by a pulse generator 34 which provides a periodic pulse signal Q and by electronic switches 36 which connect the electrode 28 alternatingly to the output Q and to the inverted output Q of this pulse generator in response to the drop demand signal D.
  • the power devices for energizing all piezoelectric elements may be formed by simple pulse generators which operate with a fixed frequency and pulsewidth, and the drop demand signal D is only applied to the electronic switches 36. These switches may be comparatively slow, because the inversion of the signal S32 may occur at any time between t3 and t4.
  • the power of the piezoelectric element 20 is made small enough, so that this element alone is not capable of generating an ink droplet, then it is also possible to suppress the pulses of the signal S32 completely when the drop demand signal D is absent.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP19960201578 1995-06-12 1996-06-05 Système à jet d'encre Expired - Lifetime EP0748691B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19960201578 EP0748691B1 (fr) 1995-06-12 1996-06-05 Système à jet d'encre

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP95201536 1995-06-12
EP95201536 1995-06-12
EP19960201578 EP0748691B1 (fr) 1995-06-12 1996-06-05 Système à jet d'encre

Publications (3)

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EP0748691A2 true EP0748691A2 (fr) 1996-12-18
EP0748691A3 EP0748691A3 (fr) 1997-07-30
EP0748691B1 EP0748691B1 (fr) 2002-10-02

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855277A2 (fr) * 1997-01-24 1998-07-29 Lexmark International, Inc. Tête d'impression à jet d'encre adaptée à la modulation de la taille des gouttes
EP0988973A1 (fr) * 1998-09-21 2000-03-29 Eastman Kodak Company Appareil d'imagerie capable d'empêcher l'éjection involontaire d'une goutellette d'encre satellite et procédé d'assemblage de l'appareil
US6318844B1 (en) 1996-02-14 2001-11-20 OCé-NEDERLAND, B.V. Print head for an ink-jet printer
WO2003070467A3 (fr) * 2002-02-20 2003-12-04 Xaar Technology Ltd Pompe a fluide et appareil de depot de gouttelettes

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364069A (en) * 1980-05-08 1982-12-14 Ricoh Co., Ltd. Multi-ink jet head
EP0072685A1 (fr) * 1981-08-14 1983-02-23 William Anthony Denne Générateur de gouttelettes pour imprimante à jet d'encre
GB2104006A (en) * 1981-07-02 1983-03-02 Shinshu Seiki Kk Ink-jet printer head
JPS6011369A (ja) * 1983-06-30 1985-01-21 Fujitsu Ltd インク噴射装置
US4525728A (en) * 1982-04-27 1985-06-25 Epson Corporation Ink jet recording head
EP0214855A2 (fr) * 1985-09-05 1987-03-18 Nec Corporation Appareil d'impression à jet d'encre réagissant à des signaux de demande
US4672398A (en) * 1984-10-31 1987-06-09 Hitachi Ltd. Ink droplet expelling apparatus
EP0608135A2 (fr) * 1993-01-22 1994-07-27 Sharp Kabushiki Kaisha Tête à jet d'encre
DE4328433A1 (de) * 1993-08-24 1995-03-02 Heidelberger Druckmasch Ag Tintenstrahl-Spritzverfahren, sowie Tintenstrahl-Spritzvorrichtung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364069A (en) * 1980-05-08 1982-12-14 Ricoh Co., Ltd. Multi-ink jet head
GB2104006A (en) * 1981-07-02 1983-03-02 Shinshu Seiki Kk Ink-jet printer head
EP0072685A1 (fr) * 1981-08-14 1983-02-23 William Anthony Denne Générateur de gouttelettes pour imprimante à jet d'encre
US4525728A (en) * 1982-04-27 1985-06-25 Epson Corporation Ink jet recording head
JPS6011369A (ja) * 1983-06-30 1985-01-21 Fujitsu Ltd インク噴射装置
US4672398A (en) * 1984-10-31 1987-06-09 Hitachi Ltd. Ink droplet expelling apparatus
EP0214855A2 (fr) * 1985-09-05 1987-03-18 Nec Corporation Appareil d'impression à jet d'encre réagissant à des signaux de demande
EP0608135A2 (fr) * 1993-01-22 1994-07-27 Sharp Kabushiki Kaisha Tête à jet d'encre
DE4328433A1 (de) * 1993-08-24 1995-03-02 Heidelberger Druckmasch Ag Tintenstrahl-Spritzverfahren, sowie Tintenstrahl-Spritzvorrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"1985 Sid International Symposium, Digest of Technical Papers" , PALISADES INSTITUTE FOR RESEARCH SERVICES, INC. , NEW YORK XP002031532 * page 317 - page 320 * *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 128 (M-384), 4 June 1985 & JP 60 011369 A (FUJITSU KK), 21 January 1985, *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6318844B1 (en) 1996-02-14 2001-11-20 OCé-NEDERLAND, B.V. Print head for an ink-jet printer
EP0855277A2 (fr) * 1997-01-24 1998-07-29 Lexmark International, Inc. Tête d'impression à jet d'encre adaptée à la modulation de la taille des gouttes
EP0855277A3 (fr) * 1997-01-24 1999-06-16 Lexmark International, Inc. Tête d'impression à jet d'encre adaptée à la modulation de la taille des gouttes
US6079811A (en) * 1997-01-24 2000-06-27 Lexmark International, Inc. Ink jet printhead having a unitary actuator with a plurality of active sections
EP0988973A1 (fr) * 1998-09-21 2000-03-29 Eastman Kodak Company Appareil d'imagerie capable d'empêcher l'éjection involontaire d'une goutellette d'encre satellite et procédé d'assemblage de l'appareil
WO2003070467A3 (fr) * 2002-02-20 2003-12-04 Xaar Technology Ltd Pompe a fluide et appareil de depot de gouttelettes

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EP0748691A3 (fr) 1997-07-30
EP0748691B1 (fr) 2002-10-02

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