EP0142150B1 - Procédé et transducteur destinés à augmenter la résolution dans un dispositif d'écriture à mosaique à encre - Google Patents

Procédé et transducteur destinés à augmenter la résolution dans un dispositif d'écriture à mosaique à encre Download PDF

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Publication number
EP0142150B1
EP0142150B1 EP84113646A EP84113646A EP0142150B1 EP 0142150 B1 EP0142150 B1 EP 0142150B1 EP 84113646 A EP84113646 A EP 84113646A EP 84113646 A EP84113646 A EP 84113646A EP 0142150 B1 EP0142150 B1 EP 0142150B1
Authority
EP
European Patent Office
Prior art keywords
strips
transducers
ink
recording device
piezo
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
EP84113646A
Other languages
German (de)
English (en)
Other versions
EP0142150A1 (fr
Inventor
Kenth Dipl.-Ing. Nilsson
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
Siemens Elema AB
Original Assignee
Siemens AG
Siemens Elema AB
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, Siemens Elema AB filed Critical Siemens AG
Publication of EP0142150A1 publication Critical patent/EP0142150A1/fr
Application granted granted Critical
Publication of EP0142150B1 publication Critical patent/EP0142150B1/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 ink mosaic writing device with a writing head having a number of piezoelectric transducers arranged in rows, in which writing fluid is ejected dropwise in the direction of a recording medium by piezoelectric deformation of the transducers. Furthermore, the invention relates to a method for increasing the resolution in such an ink mosaic writing device.
  • the present invention has for its object to design an ink mosaic writing device of the type mentioned in such a way that the resolution can be increased in a simple manner and without additional piezoelectric transducers.
  • the individual transducers consist of two strips of piezoelectric material which are arranged at a distance from one another, contacted on both sides and covered on both sides by plates such that an elongated, substantially rectangular between the strips and the plates Channel is created from which writing fluid is expelled.
  • the ink channels formed directly represent the writing nozzles.
  • a separate perforated matrix can therefore be dispensed with. If, for example, an electrical voltage is applied to the strips, they become narrower and higher, so that the enclosed channel cross-sectional area is enlarged. This draws additional writing fluid into this channel.
  • Another object of the invention is to provide a method for increasing resolution in an ink mosaic writing device.
  • the two strips of a piezoelectric transducer are temporarily deformed to different extents. This can be done, for example, by applying different voltages. Sufficient cross-sectional enlargement can still be achieved in order to additionally draw writing fluid into the ink channel. At the same time, however, the difference in length of the two piezoelectric strips causes the transducer to bend somewhat, so that the end of the transducer facing the recording medium dodges sideways. If the deformation of the two strips of the transducer is now reversed so that initially the different linear expansion and thus the bending of the transducer is maintained, a liquid drop is expelled, which is laterally offset for the transducer position in the unbent state. If the recording medium is guided close to the ink channels as usual, the offset of the point of impact of the ink drop approximately corresponds to the offset of the channel opening.
  • This bending of the ink channel and the ejection of an ink drop in this position can be achieved, for example, by superimposing a DC voltage that is different for the two strips on a voltage pulse applied to both piezoelectric strips, which practically causes and maintains the bending.
  • the number of drops per mm can be tripled. Since the ink channels are practically at rest at the moment a liquid drop is ejected, no speed component is superimposed on the drop transverse to the direction of flight.
  • the intermittent bending of the piezoelectric transducers can be achieved in a particularly simple manner by superimposing two voltage pulses, which are different for the two strips, on the voltage pulse applied to both piezoelectric strips in order to eject a drop of liquid.
  • the voltage pulses additionally applied to the two strips can have different amplitudes or different polarities.
  • the duration of the pulses only has to be selected so that the desired bending of the piezoelectric transducer is reached before the time of ejection and is maintained until after the drop of liquid is ejected, if the process is to be carried out without additional cross-speed components.
  • An ink mosaic writing device for carrying out the method which is simple in construction and stable for operation is obtained if the transducers are connected via a web in the end facing away from the recording medium.
  • the clamping of the entire transducer arrangement is simplified considerably. Furthermore, there is otherwise no need for complex adjustment work to align the individual transducers with one another.
  • the electrical control can be simplified in that the plate is made of metal on one side of the strips and serves as a common electrode for both or even all of the strips. In this case, the additional contacting that would otherwise be required on this side of the strip can be dispensed with.
  • An advantageous improvement in ink ejection results from the fact that the outlet opening of the ink channels is reduced, for example by the channel tapering in this end region.
  • a simple embodiment provides that the strips of a transducer form an acute angle.
  • the ink mosaic writing device can be produced particularly simply in that the strips of piezoelectric material are arranged in a row at a distance from one another, electrically contacted on both sides and covered on both sides with a plate covering all strips and that the plates are parallel to these and after every two strips be cut at least over part of the length thereof. This results in a comb-like arrangement with a web holding all transducers together, the teeth of the comb consisting of the individual transducers with the ink channels.
  • the recording medium 3 for example normal registration paper, is pulled past the front face 6 of a housing 7 in the direction of arrow 4 via transport rollers 1 and 2.
  • the connecting line 8 is guided, at its free end with a plug 9 for connection to a corresponding control device, which the control signals for recording the desired courses, characters or images and for the synchronization between the time deflection of the respective converter and the ejection of the individual liquid drops.
  • the housing 7 contains the actual write head, a possible embodiment of which is shown in FIG. 2.
  • the write head 10 consists of a series of piezoelectric transducers 11 to 14 and a reservoir 15 for writing fluid 16.
  • the transducer 11 indicates the ink channel 17 with dashed lines, which is subsequently explained in more detail in connection with FIG. 3.
  • the electrical contacts of the piezoelectric strips have not been shown.
  • the piezoelectric transducers 11 to 14 are connected to one another at the rear end via a common web 18. At this point it should be noted that in principle it is also possible to design each converter individually and to fasten it separately in the write head.
  • the embodiment shown has the advantage of a considerably simplified production, since a closed channel matrix can first be produced in which a row of contacted piezoelectric strips on a first plate are arranged parallel to one another and covered with a second plate. After every two strips that enclose an ink channel, an almost continuous slot is sawn into the plate in the longitudinal direction. In this way, a comb-like transducer arrangement, as used in the exemplary embodiment according to FIG. 2, is generated.
  • FIG. 3 shows a cross section through the transducer arrangement according to FIG. 2.
  • the two outermost transducers 11 and 14 are only indicated by dashed lines.
  • the converter 13 is only hinted at in its rest position.
  • the transducer 12 shown in more detail in cross section like the other transducers, consists of two piezoelectric strips 20 and 21, which are provided on both sides with a contact 22 to 25 and which are enclosed between two plates 26 and 27. In this case, the two plates are made of a non-conductive material.
  • FIG. 4a and 4b show an example of the time profile of the voltage applied to the two strips of a converter. It is assumed that the tension on strip 30 is shown in FIG. 4a and that on strip 31 in FIG. 4b.
  • an equal voltage is applied to both strips 30 and 31, which is kept constant until time t 2 and then suddenly returns to the initial value.
  • the normal effect of such a transducer element would result; the cross-sectional area increases as a result of the applied voltage, and ink is sucked into the ink channel.
  • time t 2 the cross-sectional area and thus the volume of the ink channel suddenly decreases, so that a liquid drop is expelled in the direction of the ink channel. In this case, there is no bending of the transducer element.
  • 5a-5e will be used as an example to explain how the higher resolution is achieved.
  • 5a for the sake of simplicity, only three outlet openings of transducers are shown side by side, from which liquid drops are to be expelled at the same time.
  • Fig. 5b it is assumed that the transducers are not deflected so that the locations of the recording points match the locations of the stationary transducers.
  • 5c it is assumed that all transducers are deflected to one side before the ejection of a liquid drop, so that the recording points are also shifted to this side.
  • Fig. 5d the deflection is made to the other side.
  • 5e finally shows the totality of the recording points possible as a result. With the help of the three ink channels, nine recording points can be achieved in this way.
  • FIGS. 1 to 5 are not drawn to scale for the sake of clarity. On the basis of these figures, the essentials of the method according to the invention and an advantageous embodiment of the write head are to be shown. Without departing from the scope of this invention, it is also possible to further increase the number of recording points by deflecting the individual transducers to different extents.
  • a particular advantage of the method according to the invention and the ink mosaic writing device specified here for carrying out this method is that the additional deflection of the transducers and the higher resolution achieved thereby only have to be used when necessary and only in these cases a lower paper speed has to be accepted. For designs with lower resolution requirements, you can always work with a higher paper speed. For both cases, d. H. low or high resolution, but only one write head and thus one control electronics is required. The additional effort for increasing the resolution is therefore limited to a minimum.

Landscapes

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

Claims (6)

1. Dispositif enregistreur mosaïque à encre comportant une tête d'écriture possédant un certain nombre de transducteurs piézoélectriques (11-14) disposés selon une rangée et dans laquelle une encre est éjectée sous la forme de gouttes en direction d'un support d'enregistrement (3) sous l'effet d'une déformation piézoélectrique des transducteurs (11-14), caractérisé par le fait que les différents transducteurs (11-14) sont constitués par deux bandes (20, 21 ; 30, 31) réalisées en un matériau piézoélectrique et qui sont disposées à distance l'une de l'autre, sont raccordées par des contacts sur leurs deux faces et sont recouvertes, sur leurs deux faces, par des plaques (26, 27; 36, 37) de telle sorte qu'entre les bandes (20,21; 30,31) et les plaques (26, 27; 36, 37) se trouve formé un canal allongé, sensiblement rectangulaire (17), hors duquel l'encre (16) est éjectée.
2. Dispositif d'enregistrement mosaîque à encre suivant la revendication 1, caractérisé par le fait que les transistors (11-14) sont réunis entre eux d'un seul tenant par l'intermédiaire d'une barrette (18), au niveau de leur extrémité tournée à l'opposé du support d'enregistrement (3).
3. Dispositiv enregistreur mosaîque à encre suivant la revendication 1 ou 2, caractérisé par le fait que la plaque (27; 37) est située sur une face des bandes (20, 21; 30, 31), est réalisée en un métal et sert d'électrode commune pour les deux bandes.
4. Procédé pour accroître la résolution dans un dispositif enregistreur mosaîque (40) suivant l'une des revendications 1-3, caractérisé par le fait que les deux bandes (20, 21; 30, 31) sont déformées temporairement avec des amplitudes de déformation différentes.
5. Procédé suivant la revendication 4, caractérisé par le fait que la déformation variable est réalisée par superposition de deux impulsions de tension différentes pour les deux bandes à l'impulsion de tension prévue pour éjecter une goutte d'encre et appliquée aux deux bandes piétzélectriques (20, 21; 30, 31).
6. Procédé pour fabriquer les transducteurs suivant l'une des revendications 1-5, caractérisé par le fait qu'on dispose les bandes (20, 21; 30, 31) réalisées en un matériau piézoélectrique à distance l'une de l'autre selon une rangée, qu'on établit un contact électrique avec leurs deux faces et qu'on les recouvre, sur leurs deux faces, par une plaque recouvrant toutes les bandes, et qu'on sépare les plaques, au bout de respectivement deux bandes, parallèlement à ces dernières et au moins sur une partie de la longueur de ces bandes.
EP84113646A 1983-11-15 1984-11-12 Procédé et transducteur destinés à augmenter la résolution dans un dispositif d'écriture à mosaique à encre Expired EP0142150B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833341401 DE3341401A1 (de) 1983-11-15 1983-11-15 Verfahren und wandler zum erhoehen der aufloesung bei einer tintenmosaikschreibeinrichtung
DE3341401 1983-11-15

Publications (2)

Publication Number Publication Date
EP0142150A1 EP0142150A1 (fr) 1985-05-22
EP0142150B1 true EP0142150B1 (fr) 1988-05-11

Family

ID=6214444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113646A Expired EP0142150B1 (fr) 1983-11-15 1984-11-12 Procédé et transducteur destinés à augmenter la résolution dans un dispositif d'écriture à mosaique à encre

Country Status (4)

Country Link
US (1) US4566017A (fr)
EP (1) EP0142150B1 (fr)
JP (1) JPS60116462A (fr)
DE (2) DE3341401A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0268204B1 (fr) * 1986-11-14 1991-09-18 Qenico AB Pompe piézo-électrique
US4887100A (en) * 1987-01-10 1989-12-12 Am International, Inc. Droplet deposition apparatus
JPH04251750A (ja) * 1991-01-28 1992-09-08 Fuji Electric Co Ltd インクジェット記録ヘッド
US6296811B1 (en) * 1998-12-10 2001-10-02 Aurora Biosciences Corporation Fluid dispenser and dispensing methods
JP4498757B2 (ja) * 2004-01-20 2010-07-07 大日本印刷株式会社 シールエンドカートン
EP4057166A1 (fr) 2021-03-10 2022-09-14 Thales DIS France SA Procédé de commande d'un appareil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2361762C3 (de) * 1973-12-12 1980-04-17 Philips Patentverwaltung Gmbh, 2000 Hamburg Schreib-Vorrichtung zum punktförmigen selektiven Übertragen flüssiger Farbe
US3871004A (en) * 1974-06-26 1975-03-11 Olympia Werke Ag Ink drop writing head
DE2444517B2 (de) * 1974-09-18 1976-09-16 Olympia Werke Ag, 2940 Wilhelmshaven Tintenspritz-schreibwerk fuer einen bildtelegraphen
DE2527647C3 (de) * 1975-06-20 1981-06-25 Siemens AG, 1000 Berlin und 8000 München Mit Flüssigkeitströpfchen arbeitendes Schreibgerät
US4308547A (en) * 1978-04-13 1981-12-29 Recognition Equipment Incorporated Liquid drop emitter
JPS5783459A (en) * 1980-11-14 1982-05-25 Alps Electric Co Ltd Printer head
US4386358A (en) * 1981-09-22 1983-05-31 Xerox Corporation Ink jet printing using electrostatic deflection
US4453169A (en) * 1982-04-07 1984-06-05 Exxon Research And Engineering Co. Ink jet apparatus and method

Also Published As

Publication number Publication date
US4566017A (en) 1986-01-21
DE3471042D1 (en) 1988-06-16
DE3341401A1 (de) 1985-05-23
EP0142150A1 (fr) 1985-05-22
JPS60116462A (ja) 1985-06-22
JPH0455111B2 (fr) 1992-09-02

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