EP0094032B1 - Dispositif pour l'éjection de gouttelettes d'encre - Google Patents

Dispositif pour l'éjection de gouttelettes d'encre Download PDF

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Publication number
EP0094032B1
EP0094032B1 EP83104401A EP83104401A EP0094032B1 EP 0094032 B1 EP0094032 B1 EP 0094032B1 EP 83104401 A EP83104401 A EP 83104401A EP 83104401 A EP83104401 A EP 83104401A EP 0094032 B1 EP0094032 B1 EP 0094032B1
Authority
EP
European Patent Office
Prior art keywords
transducer
channel
arrangement
cross
outlet opening
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.)
Expired
Application number
EP83104401A
Other languages
German (de)
English (en)
Other versions
EP0094032A1 (fr
Inventor
Joachim Prof. Dr.-Ing. Heinzl
Günter Dipl.-Ing. Rosenstock
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0094032A1 publication Critical patent/EP0094032A1/fr
Application granted granted Critical
Publication of EP0094032B1 publication Critical patent/EP0094032B1/fr
Expired 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
    • B41J2/04581—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

Definitions

  • the invention relates to an arrangement according to the preamble of patent claim 1.
  • an arrangement for an ink mosaic writing device in which an ejection of ink droplets is brought about by the fact that to initiate an ejection process a piezo transducer comprising an ink channel, hereinafter referred to as transducer, by applying one of the directions of polarization of the transducer
  • the voltage is first expanded, and then the voltage causing the expanding state is converted into a narrowed state by changing the polarity.
  • the pulse provided for this is always a bipolar pulse. For reasons of a simple circuit structure and a reduced power requirement, however, it is very desirable to enable safe droplet ejection with simple control impulses that fully meets the requirements of today's printing technology.
  • the ejected droplets should be shaped so that they take on a spherical shape very quickly after their ejection, and further that subsequent droplets, even if they are released at close intervals, are influenced as little as possible.
  • the object of the invention is to provide an arrangement which, using unipolar pulses and thus simple circuits, makes it possible to eject droplets which are ejected at high speed and rapidly assume the shape of a sphere.
  • Another advantage of the invention is that the supply lines and ink supplies are decoupled from the processes in the channel without the need for expensive measures.
  • the ink channel 2 shown in Fig. 1 has at one end an outlet opening 3, the diameter of which is small compared to the diameter of the ink channel.
  • a cross-sectional widening 4 is provided at its other end.
  • the cross-sectional widening 4 represents a reflection closure of the channel 2, on which pressure waves are reflected with the sign reversed. This reflection takes place almost completely, apart from physical losses.
  • the cross-sectional enlargement 4 is formed by the opening into a so-called ink supply chamber 6. This is what is not shown here, for. B. via a feed channel with an ink reservoir that is slightly lower than the outlet opening 3 of the ink channel. As long as no special influences or actions occur, this ensures that in the idle state, leakage of ink through the outlet opening 3 is reliably avoided.
  • the ink channel 2 can advantageously be formed by a recess in a plastic part 1.
  • the ink channel 2 is surrounded by a transducer 5. It is a polarized piezoceramic that changes its diameter when actuated with appropriately polarized control pulses U. A voltage applied in the direction of the polarization direction of the transducer 5 leads to a narrowing, while a pulse of opposite polarity causes the transducer to expand.
  • the converter has connections which connect it to a control circuit 7 via its electrodes. This can be controlled, for example, by the character generator of a printer and provides the correspondingly polarized control pulses U.
  • the transducer 5 comprises the ink channel 2 only over an area b and is arranged at a distance a from the cross-sectional widening 4.
  • the switching off of the pulse at time t2 has such a effect that the transducer 5 returns to its rest position and that the positive part + pa of the pressure wave w is generated, which also propagates in the ink channel 2 in both directions at the speed of sound (Fig. 2, line 2). With an assumed running time Iw, these pressure waves w arrive at the outlet opening 3 at times t4, t5 and t6 (FIG. 2, line 3).
  • the pressure wave propagating in the direction of the cross-sectional expansion is reflected on the cross-sectional expansion 4 with reversal of the sign.
  • the resulting reflected pressure waves wr also move at the speed of sound through the ink channel 2 in the direction of the outlet opening 3. There they arrive at the times t5, t6 and t7 with an assumed running time Iw + 2 Iwr (FIG. 2, line 4).
  • the pressure curve effective at the outlet opening 3 is determined by the unreflected pressure waves w and by the reflected pressure waves wr.
  • the part of the non-reflected pressure wave w arriving first (FIG. 2, line 5, phase I) causes the ink to be drawn back into the outlet opening 3.
  • the immediately following positive part of the non-reflected pressure wave w is overlaid by the also as a positive part of the incoming reflected pressure wave wr, which leads to a very high pressure increase in the area of the outlet nozzle 3 (FIG. 2, line 5, phase 11).
  • the meniscus of the ink is thereby accelerated very strongly in the direction of the outlet opening 3, so that an ink droplet begins to emerge from the outlet opening at the later flight speed.
  • the negative part of the reflected pressure wave -wr occurs (FIG. 2, line 5, phase 111), which has a negative pressure effect in the area of the outlet opening 3.
  • the amount of ink accelerated outwards during phase 11 is constricted and the droplet is separated off.
  • a new meniscus forms, which retracts to the starting position.
  • the rest position (Fig. 2, line 5, phase IV) is reached.
  • the duration of the drive pulse U i. H. the time period T between the expansion of the transducer 5 and the resetting of a greater or equal transit time of a pressure wave through the part of the ink-filled area of the ink channel enclosed by the transducer 5 corresponds to and that the time for the expansion and for resetting the transducer 5 itself is short compared to this term is.
  • the length b of the transducer 5, the pulse duration T and the distance a of the transducer from the cross-sectional expansion 4 such that the pressure wave w generated by driving the transducer 5 and the pressure wave reflected on the cross-sectional expansion 4 with reversed sign run at such a distance in the ink channel 2 that the pressure reduction in phase I, the pressure increase in phase 11, the pressure reduction in phase 111 and then the idle state in phase IV occur in succession in the region of the outlet opening 3.
  • the time for refilling the amount of ink ejected from the ink channel 2 is considerably reduced in the arrangement according to the invention, since the amount of ink required for the ejection was already largely provided during the first phase I.
  • the so-called spray frequency i.e. H. the frequency at which successive ink droplets can be ejected is essentially only limited by the ringing processes that usually take place in the ink channel.
  • the ink channel between the outlet opening and the transducer is delimited by a soft and damping channel wall.
  • the channel can also be somewhat narrowed in the area in which it emerges from the area of the transducer with its hard channel wall, so that pressure waves can propagate largely without reflection from the transducer into the ink channel while they are at the other end of the channel the cross-sectional expansion with reversed sign are reflected.
  • compensation pulses to the transducer by twice the running time of a pressure wave from the outlet opening to the cross-sectional expansion after the start of the actuation pulse, which are caused by reflection at the outlet opening and by reflection the cross-sectional expansion largely eliminate such disturbing pressure waves that reach the area of the transducer.
  • Such compensation pulses can, for. B. the derivation of the control pulse can be formed according to the time.
  • the invention has been described using an exemplary embodiment for a single ink channel. However, it is within the scope of the invention to design and activate a large number of ink channels in the manner specified control, and to arrange them overall in a multiple nozzle head. An ink mosaic pen designed according to the features of the invention can then be produced in a particularly advantageous manner using the proven injection molding process.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (9)

1. Agencement d'éjection de gouttelettes d'un canal empli de liquide et présentant une ouverture de sortie, le canal étant entouré sur une partie de sa longueur d'un transducteur piézoé- lectrique dont le diamètre varie par excitation au moyen d'impulsions de commande, et dans lequel, pour faire débuter une éjection de gouttelettes, une impulsion de polarité opposée au sens de polarisation du transducteur est appliquée au transducteur, caractérisé en ce que le canal (2) présente, à l'extrémité éloignée de l'ouverture de sortie (3), un élargissement de la section transversale (4), sur lequel une onde de pression (pa), produite par l'excitation du transducteur, est réfléchie (pr) totalement avec changement de signe, en ce que le transducteur (5) entoure de canal (2) à proximité de l'élargissement de la section droite (4) et en ce que le transducteur (5) est excité par des impulsions unipolaires à flancs avant et arrière symétriques.
2. Agencement suivant la revendication 1, caractérisé en ce que la longueur (6) du transducteur (5), la durée des impulsions (T) et la distance (a) du transducteur (5) à l'élargissement de la section droite (4) sont harmonisés les uns aux autres de manière à ce que les ondes de pression (pa), produites par l'excitation du transducteur (5), et les ondes de pression (pr), réfléchies avec changement de signe sur l'élargissement de la section transversale (4), passent dans le canal (2) à une distance telle qu'il s'établit successivement dans la région de l'ouverture de sortie (3) d'abord une diminution de la pression (phase 1), puis une augmentation de la pression (phase II), puis à nouveau une diminiution de la pression (phase III) et ensuite l'état de repos (phase IV).
3. Agencement suivant la revendication 1 ou 2, caractérisé en ce que la durée (c) entre l'élargissement du transducteur (5) et le retour à l'état initial est supérieure ou égale à la durée de propagation d'une onde de pression dans la partie (b) du canal (2) qui est entourée par le transducteur (5) et en ce que la durée elle même de l'élargissement et du retour à l'état initial du transducteur est brève en comparaison de cette durée de propagation.
4. Agencement suivant l'une des revendications précédentes, caractérisé en ce qu'après le début d'une éjection de gouttelettes (phase I) l'éjection d'une gouttelette par l'ouverture de sortie (3) s'effectue par suppression de l'impulsion (U) (phases Il et III).
5. Agencement suivant l'une des revendications 1 à 4, caractérisé en ce que le canal (2) est formé d'un matériau élastique ayant des propriétés d'amortissement.
6. Agencement suivant la revendication 5, caractérisé en ce que le canal (2) présente dans la région entourée par le transducteur (5) un diamé- tre légèrement plus grand.
7. Agencement suivant l'une des revendications 1 à 6, caractérisé en ce que le transducteur (5) peut être excité par des impulsions de compensation retardées dans le temps par rapport à une impulsion de commande (U), en ce que le retard dans le temps est défini par le double de la durée de propagation d'une onde de pression entre l'ouverture de sortie (3) et l'élargissement de la section droite (4) et en ce que les impulsions de compensation ont une énergie plus faible que les impulsions de commande.
8. Agencement suivant la revendication 7, caractérisé en ce que la forme des impulsions de compensation correspond à la dérivée des impulsions de commande en fonction du temps.
9. Agencement suivant l'une des revendications 1 à 8, caractérisé en ce qu'il est prévu un grand nombre de canaux (2) présentant chacun une ouverture de sortie (3) qui, à leur extrémité éloignée des ouvertures de sortie (3), communiquent avec une région (6) commune, emplie de liquide et constituée avantageusement en chambre d'alimentation, ces communications représentant les élargissements de la section transversale (4), en ce que chaque canal (2) est entouré à proximité (distance a) de l'élargissement de la section transversale (4), d'un transducteur (5) sur une partie (b) de sa longueur et en ce que chaque transducteur (5) est relié à un circuit de commande, qui envoie les impulsions de commande et, le cas échéant, les impulsions de compensation.
EP83104401A 1982-05-07 1983-05-04 Dispositif pour l'éjection de gouttelettes d'encre Expired EP0094032B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3217248A DE3217248C2 (de) 1982-05-07 1982-05-07 Anordnung zum Ausstoß von Tintentröpfchen
DE3217248 1982-05-07

Publications (2)

Publication Number Publication Date
EP0094032A1 EP0094032A1 (fr) 1983-11-16
EP0094032B1 true EP0094032B1 (fr) 1985-09-11

Family

ID=6163033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104401A Expired EP0094032B1 (fr) 1982-05-07 1983-05-04 Dispositif pour l'éjection de gouttelettes d'encre

Country Status (4)

Country Link
US (1) US4716418A (fr)
EP (1) EP0094032B1 (fr)
JP (1) JPS58203064A (fr)
DE (1) DE3217248C2 (fr)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3319353A1 (de) * 1983-05-27 1984-11-29 Siemens AG, 1000 Berlin und 8000 München Verfahren und schaltungsanordnung zum einstellen der troepfchenausstossgeschwindigkeit in tintenschreibeinrichtungen
DE3405062A1 (de) * 1984-02-13 1985-08-22 Nixdorf Computer Ag, 4790 Paderborn Schreibkopf fuer tintenmosaikschreibeinrichtungen
IT1183811B (it) * 1985-05-02 1987-10-22 Olivetti & Co Spa Circuito di pilotaggio per un elemento di scrittura a getto di inchiostro e relativo metodo di dimensionamento e di fabbricazione
US4897665A (en) * 1986-10-09 1990-01-30 Canon Kabushiki Kaisha Method of driving an ink jet recording head
US4835554A (en) * 1987-09-09 1989-05-30 Spectra, Inc. Ink jet array
US4891654A (en) * 1987-09-09 1990-01-02 Spectra, Inc. Ink jet array
US5587727A (en) * 1993-04-23 1996-12-24 Brother Kogyo Kabushiki Kaisha Ink jet apparatus using pressure wave intersection to eject ink droplets
US6123405A (en) * 1994-03-16 2000-09-26 Xaar Technology Limited Method of operating a multi-channel printhead using negative and positive pressure wave reflection coefficient and a driving circuit therefor
ATE177369T1 (de) * 1994-07-20 1999-03-15 Spectra Inc Auf abruf arbeitende hochfrequenz- tintenstrahldruckvorrichtung
JP3528322B2 (ja) * 1995-05-19 2004-05-17 ブラザー工業株式会社 インクジェット記録装置
JPH0966603A (ja) * 1995-08-31 1997-03-11 Brother Ind Ltd インク噴射装置の駆動方法
DE19704970C1 (de) * 1997-01-28 1998-05-14 Francotyp Postalia Gmbh Vorrichtung für einen Tintendruckkopf
AUPP654398A0 (en) * 1998-10-16 1998-11-05 Silverbrook Research Pty Ltd Micromechanical device and method (ij46g)
US6126260A (en) * 1998-05-28 2000-10-03 Industrial Technology Research Institute Method of prolonging lifetime of thermal bubble inkjet print head
US6902255B1 (en) 1998-10-16 2005-06-07 Silverbrook Research Pty Ltd Inkjet printers
US6390600B1 (en) 2001-04-30 2002-05-21 Hewlett-Packard Company Ink jet device having variable ink ejection
US7490405B2 (en) 2004-03-24 2009-02-17 Fujifilm Corporation Method for manufacturing a liquid droplet discharge head.
CN100528570C (zh) * 2004-04-16 2009-08-19 深圳赛意法微电子有限公司 喷墨打印机的笔和笔故障检查电路及检查笔中故障的方法
US20080061471A1 (en) * 2006-09-13 2008-03-13 Spin Master Ltd. Decorative moulding toy
US7914125B2 (en) 2006-09-14 2011-03-29 Hewlett-Packard Development Company, L.P. Fluid ejection device with deflective flexible membrane
US8042913B2 (en) 2006-09-14 2011-10-25 Hewlett-Packard Development Company, L.P. Fluid ejection device with deflective flexible membrane
US7651204B2 (en) * 2006-09-14 2010-01-26 Hewlett-Packard Development Company, L.P. Fluid ejection device
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Also Published As

Publication number Publication date
JPS58203064A (ja) 1983-11-26
JPH0252626B2 (fr) 1990-11-14
US4716418A (en) 1987-12-29
DE3217248C2 (de) 1986-01-02
DE3217248A1 (de) 1983-11-10
EP0094032A1 (fr) 1983-11-16

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