EP0142150A1 - 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
EP0142150A1
EP0142150A1 EP84113646A EP84113646A EP0142150A1 EP 0142150 A1 EP0142150 A1 EP 0142150A1 EP 84113646 A EP84113646 A EP 84113646A EP 84113646 A EP84113646 A EP 84113646A EP 0142150 A1 EP0142150 A1 EP 0142150A1
Authority
EP
European Patent Office
Prior art keywords
strips
transducers
transducer
piezoelectric
ink
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
EP84113646A
Other languages
German (de)
English (en)
Other versions
EP0142150B1 (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 a method for increasing the resolution in an ink mosaic writing device with a writing head having a number of piezoelectric transducers arranged in a row, in which writing fluid is ejected dropwise in the direction of a recording medium by piezoelectric deformation of the transducers.
  • the present invention has for its object to provide a method and a transducer with which the resolution in an ink mosaic writing device of the type mentioned can be increased in a simple manner and without additional piezoelectric transducers.
  • the individual transducers consist of two strips made of piezoelectric material exist, which are arranged at a distance from each other, contacted on both sides and covered on both sides by plates in such a way that an elongated, essentially rectangular channel is formed between the strips and the plates, from which the writing fluid is ejected, and that the two strips at least temporarily deformed to different degrees.
  • the ink channels formed directly represent the writing nozzles.
  • a separate perforated matrix can therefore be dispensed with. For example, if an electrical voltage is applied to the strips, they become narrower and higher, so that the enclosed cross-sectional area of the channel is enlarged, which means that additional writing fluid is sucked into this channel. If the voltage at this contact is removed or even a pulse of reverse polarity is applied for a short time, the strips return to their original shape, which suddenly reduces the channel volume. This leads to ejection of writing fluid.
  • the piezoelectric strips become shorter at the same time. If, according to the method according to the invention, the two strips of a piezoelectric transducer are deformed differently, for example due to different voltages, a 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.
  • This bending of the ink channel and the ejection of an ink drop in this position can be realized, 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 deflection amplitude is increased to 80 ⁇ m and if the non-curved rest position of the ink channel is also used to eject a drop, the number of drops per mm can already be tripled. Since the ink channels are practically at rest in the moment of ejection of a liquid drop, no speed component is superimposed on the drop transversely to the direction of flight.
  • the intermittent bending of the piezoelectric transducers can be achieved particularly easily by superimposing two voltage pulses different for the two strips on the voltage pulse applied to both piezoelectric strips 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.
  • ink mosaic writing device which is simple in construction and stable for operation, for carrying out the method.
  • the transducers in the end facing away from the recording medium are connected via a web.
  • the clamping of the entire transducer arrangement is simplified considerably.
  • the electrical control can be simplified further 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 strips can be dispensed with.
  • An advantageous transducer arrangement for carrying out the method can be produced particularly simply in that a channel matrix, which consists of a series of strips of piezoelectric material, which are arranged in parallel and at a distance from one another, makes electrical contact on both sides and on both sides with a plate covering all strips are covered, is cut after two strips parallel to these and at least over part of the length thereof.
  • a channel matrix which consists of a series of strips of piezoelectric material, which are arranged in parallel and at a distance from one another, makes electrical contact on both sides and on both sides with a plate covering all strips are covered, is cut after two strips parallel to these and at least over part of the length thereof.
  • the outer basic structure of an ink mosaic writing device can be seen from FIG.
  • the recording medium 3, for example normal registration paper, is drawn 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, which at its free end has a plug 9 for connection to a corresponding control device which contains the control signals for recording the desired courses, characters or images and for the synchronization between the time deflection of the respective transducers 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 writing head 10 consists of a series of piezoelectric transducers 11 to 14 and a reservoir 15 for writing fluid 16.
  • the ink channel 17 is indicated by dashed lines, which is 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 individually design each transducer and fasten it separately in the print head.
  • the embodiment shown has the advantage of a considerably simplified production, since first a closed channel matrix can be produced in which a row of contacted piezoelectric strips on a first plate are arranged parallel to one another and with a second plate to be covered. 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 is used in the exemplary embodiment according to FIG. 2, is produced.
  • FIG. 3 shows a cross section through the converter arrangement according to FIG. 2.
  • the two outermost converters 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.
  • 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 ejected at the same time.
  • 5b is assume 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 a lower paper speed only has to be accepted for these cases. For designs with lower resolution requirements, you can always work with a higher paper speed. For both cases, ie low or high resolution, there is always only one write head and thus one control electronics necessary. The additional effort for increasing the resolution is therefore limited to a minimum.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
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 true EP0142150A1 (fr) 1985-05-22
EP0142150B1 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022189089A1 (fr) 2021-03-10 2022-09-15 Thales Dis France Sas Procédé de commande d'un appareil

Families Citing this family (5)

* 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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254437A1 (fr) * 1973-12-12 1975-07-11 Philips Nv
DE2444517A1 (de) * 1974-09-18 1976-04-01 Olympia Werke Ag Tintenspritz-schreibwerk fuer einen bildtelegraphen
FR2314832A1 (fr) * 1975-06-20 1977-01-14 Siemens Ag Appareil enregistreur fonctionnant par projection de gouttelettes de liquide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3871004A (en) * 1974-06-26 1975-03-11 Olympia Werke Ag Ink drop writing head
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2254437A1 (fr) * 1973-12-12 1975-07-11 Philips Nv
DE2444517A1 (de) * 1974-09-18 1976-04-01 Olympia Werke Ag Tintenspritz-schreibwerk fuer einen bildtelegraphen
FR2314832A1 (fr) * 1975-06-20 1977-01-14 Siemens Ag Appareil enregistreur fonctionnant par projection de gouttelettes de liquide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022189089A1 (fr) 2021-03-10 2022-09-15 Thales Dis France Sas Procédé de commande d'un appareil

Also Published As

Publication number Publication date
US4566017A (en) 1986-01-21
DE3471042D1 (en) 1988-06-16
DE3341401A1 (de) 1985-05-23
EP0142150B1 (fr) 1988-05-11
JPS60116462A (ja) 1985-06-22
JPH0455111B2 (fr) 1992-09-02

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