EP0022254A1 - Piezoelectric drive element for the printing nozzles in mosaic ink-printer units - Google Patents

Piezoelectric drive element for the printing nozzles in mosaic ink-printer units Download PDF

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Publication number
EP0022254A1
EP0022254A1 EP80103791A EP80103791A EP0022254A1 EP 0022254 A1 EP0022254 A1 EP 0022254A1 EP 80103791 A EP80103791 A EP 80103791A EP 80103791 A EP80103791 A EP 80103791A EP 0022254 A1 EP0022254 A1 EP 0022254A1
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EP
European Patent Office
Prior art keywords
drive element
winding
element according
compression chamber
writing
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Withdrawn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
EP80103791A
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German (de)
French (fr)
Inventor
Max Dr.Rer.Nat. Guntersdorfer
Peter Dipl.-Phys. Kleinschmidt
Klaus Dr.Rer.Nat. Dietrich
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
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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 EP0022254A1 publication Critical patent/EP0022254A1/en
Withdrawn legal-status Critical Current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
    • 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
    • B41J2/1429—Structure of print heads with piezoelectric elements of tubular type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S310/00—Electrical generator or motor structure
    • Y10S310/80—Piezoelectric polymers, e.g. PVDF

Definitions

  • the invention relates to a piezoelectric drive element for writing nozzles, in particular in ink mosaic writing devices, in which a writing fluid contained in a compression chamber enclosed by the drive element in a cylindrical manner is ejected in droplets by controllable contraction of the compression chamber.
  • a piezoelectric drive element for writing nozzles is known for example from DE-PS 25 37 767.
  • the application of this effect in an ink mosaic writing device is described for example in DE-OS 25 48 691.
  • tubular, the ink channels cylindrical encircling drive elements are made of polarized ceramic used, the diameter of which narrow when an electrical voltage polarized in the direction of the polarization voltage is applied, and widen when an electrical voltage polarized against the polarization voltage is applied.
  • the drive element is first expanded via a suitable circuit arrangement and then controlled by reversing the polarity of the voltage into a narrowed state, as a result of which an ink droplet is ejected.
  • a pulse-like voltage of more than 80V is required to operate such an arrangement.
  • the circuits to be provided for generating the voltage pulse increase the outlay for an ink spray head insofar as such voltage generation must be present for each of the piezoelectrically operated writing nozzles.
  • the invention has for its object to provide a piezoelectric drive element for writing nozzles in ink mosaic writing devices, which can be operated with a significantly lower voltage while maintaining the known advantages of such arrangements.
  • the writing head 1 of an ink mosaic writing device partially shown in FIG. 1 contains the ink channel 2, which narrows towards the outlet opening 3 and forms a writing nozzle.
  • the write head 1 is closed by a nozzle plate 4 which has the outlet openings 3.
  • the ink channel 2 is partially enclosed in a cylindrical shape by the drive element 5, 6.
  • the drive element consists of a winding 6, which is formed by many layers of a thin film with piezoelectric properties which is contacted on both sides over a large area, and which has one on the end faces and on the outer surfaces elastic material 5, which may for example be silicone rubber, is encased.
  • the voltage pulses necessary for the operation of the piezoelectric drive element are applied via connections 7, 8, by means of which a change in the inner radius of the winding is effected depending on the polarity of the designed voltage and the direction of the polarization voltage of the piezoelectric material.
  • FIG. 2 and 3 each show an exemplary embodiment of the winding 6.
  • the winding shown in FIG. 2 consists of several layers of a thin film 9, for example polyvinylidene difluoride PVDF, which is contacted on both sides over a large area. It is formed by winding two foils placed against one another, both foils being piezoelectrically active. As shown in FIG. 3, one of the foils can be replaced by an insulating layer 10. In any case, it is essential that between There is very good contact between the individual layers of the winding. This can be achieved, for example, by mechanical pre-tensioning when the films are wound up or by thinly coating the films with viscous adhesives or liquids before the winding process.
  • the winding is either poured directly into the comparatively rigid plastic body of the ink spray head, or, as in the exemplary embodiment in FIG. 1, it is encased on the end faces and on the outer surfaces by an elastic material, for example silicone rubber.
  • Electrodes are used to connect the winding to the operating voltage, for which materials with low modulus of elasticity, high ductility and high electrical conductivity are advantageously used.
  • a drive element designed according to the invention which surrounds an ink channel with a diameter of approximately 0.8 mm in a cylindrical shape over a width of approximately 10 mm, droplets at a pulse voltage of 35 V from an outlet opening with a diameter of 40 / u can be driven at a speed of 4 m / sec be expelled.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

Die Anmeldung betrifft ein Antriebselement, bestehend aus einem durch mehrere Lagen einer dünnen, beidseitig großflächig kontaktierten Kunststoffolie (9) mit piezoelektrischen Eigenschaften gebildeten Wickel (6) der im Kunststoffgehäuse des Spritzkopfes (1) die Kompressionskammer umgibt. Der Wickel kann aus aneinandergelegten Folien mit entgegengesetzter Polarisationsrichtung oder aus aneinandergelegter Folie (9) und Isoliermaterial (10) bestehen. Zur Kontraktion des Antriebselementes und damit zur Tröpfchenbildung ist ein Spannungsimpuls geringerer Amplitude als für den Betrieb mit dem Piezoröhrchen notwendig.The application relates to a drive element consisting of a winding (6) formed by several layers of a thin plastic film (9) with large electrical contact on both sides with piezoelectric properties, which surrounds the compression chamber in the plastic housing of the spray head (1). The winding can consist of foils placed against one another with opposite polarization directions or of foils placed against one another (9) and insulating material (10). A voltage pulse of lower amplitude than for operation with the piezo tube is necessary for contraction of the drive element and thus for droplet formation.

Description

Die Erfindung betrifft ein piezoelektrisches Antriebselement für Schreibdüsen, insbesondere in Tintenmosaikschreibeinrichtungen, bei denen eine in einer von dem Antriebselement zylinderförmig umfaßten Kompressionskammer enthaltene Schreibflüssigkeit durch steuerbare Kontraktion der Kompressionskammer tröpfchenförmig ausgestoßen wird.The invention relates to a piezoelectric drive element for writing nozzles, in particular in ink mosaic writing devices, in which a writing fluid contained in a compression chamber enclosed by the drive element in a cylindrical manner is ejected in droplets by controllable contraction of the compression chamber.

Es ist seit längerem bekannt, den sogenannten Piezoeffekt zumkAntrieb von Schreibdüsen in Tintenschreibeinrichtungen auszunutzen. Ein piezoelektrisches Antriebselement für Schreibdüsen ist beispielsweise aus der DE-PS 25 37 767 bekannt. Die Anwendung dieses Effektes in einer Tintenmosaikschreibeinrichtung ist beispielsweise in der DE-OS 25 48 691 beschrieben. Bei dieser bekannten Anordnung werden röhrenförmige, die Tintenkanäle zylinderförmig umfassende Antriebselemente aus polarisierter Keramik verwendet, deren Durchmesser sich bei Anliegen einer in Richtung der Polarisationspannung gepolten elektrischen Spannung verengen, und bei Anliegen einer entgegen der Polarisationsspannung gepolten elektrischen Spannung erweitern. Über eine geeignete Schaltungsanordnung wird das Antriebselement zunächst erweitert und dann durch Umpolung der Spannung in einen verengten Zustand gesteuert, wodurch ein Tintentröpfchen ausgestoßen wird. Für den Betrieb einer derartigen Anordnung ist eine impulsartig auftretende Spannung von mehr als 80V erforderlich. Die zur Erzeugung des Spannungsimpulses vorzusehenden Schaltungen erhöhen den Aufwand für einen Tintenspritzkopf insofern, als für jede der piezoelektrisch betriebenen Schreibdüsen eine derartige Spannungserzeugung vorhanden sein muß.It has long been known to use the so-called piezo effect for driving writing nozzles in ink writing devices. A piezoelectric drive element for writing nozzles is known for example from DE-PS 25 37 767. The application of this effect in an ink mosaic writing device is described for example in DE-OS 25 48 691. In this known arrangement tubular, the ink channels cylindrical encircling drive elements are made of polarized ceramic used, the diameter of which narrow when an electrical voltage polarized in the direction of the polarization voltage is applied, and widen when an electrical voltage polarized against the polarization voltage is applied. The drive element is first expanded via a suitable circuit arrangement and then controlled by reversing the polarity of the voltage into a narrowed state, as a result of which an ink droplet is ejected. A pulse-like voltage of more than 80V is required to operate such an arrangement. The circuits to be provided for generating the voltage pulse increase the outlay for an ink spray head insofar as such voltage generation must be present for each of the piezoelectrically operated writing nozzles.

Der Erfindung liegt die Aufgabe zugrunde, ein piezoelektrisches Antriebselement für Schreibdüsen in Tintenmosaikschreibeinrichtungen zu schaffen, das unter Beibehaltung der bekannten Vorteile derartiger Anordnungen mit einer erheblich geringeren Spannung betrieben werden kann.The invention has for its object to provide a piezoelectric drive element for writing nozzles in ink mosaic writing devices, which can be operated with a significantly lower voltage while maintaining the known advantages of such arrangements.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Merkmale gelöst. Weitere Ausgestaltungen der Erfindung sind durch die in den Unteransprüchen angegebenen Merkmale gekennzeichnet.This object is achieved by the features specified in the characterizing part of patent claim 1. Further embodiments of the invention are characterized by the features specified in the subclaims.

Einzelheiten der_Erfindung werden im folgenden anhand der Zeichnungen näher beschrieben. Im einzelnen zeigt

  • Fig. 1 einen Ausschnitt eines Schreibkopfes mit einem Antriebselement
  • Fig. 2 und 3 jeweils Aufbaumöglichkeiten für ein Antriebselement.
Details of the invention are described in more detail below with reference to the drawings. In detail shows
  • Fig. 1 shows a section of a write head with a drive element
  • 2 and 3 each construction options for a drive element.

Der in Fig. 1 teilweise dargestellte Schreibkopf 1 einer Tintenmosaikschreibeinrichtung enthält den Tintenkanal 2, der sich zur Austrittsöffnung 3 hin verengt und eine Schreibdüse bildet. Der Schreibkopf 1 ist durch eine Düsenplatte 4 abgeschlossen, die die Austrittsöffnungen 3 aufweist. Der Tintenkanal 2 ist teilweise von dem Antriebselement 5, 6 zylinderförmig umschlossen. Im Bereich des Antriebselementes stellt der Tintenkanal eine sogenannte Kompressionskammer dar. Im Ausführungsbeispiel besteht das Antriebselement aus einem Wickel 6, der durch viele Lagen einer _dünnen, beidseitig großflächig kontaktierten Folie mit piezoelektrischen Eigenschaften gebildet ist,und der an den Stirnflächen und an den Außenflächen von einem elastischen Material 5, das beispielsweise Siliconkautschuk sein kann, umhüllt ist. Über Anschlüsse 7, 8 werden die zum Betrieb des piezoelektrischen Antriebselementes notwendigen Spannungsimpulse angelegt, durch die abhängig von der Polung der ausgelegten Spannung und der Richtung der Polarisationsspannung des piezoelektrischen Materials eine Veränderung des Innenradius des Wickels bewirkt wird.The writing head 1 of an ink mosaic writing device partially shown in FIG. 1 contains the ink channel 2, which narrows towards the outlet opening 3 and forms a writing nozzle. The write head 1 is closed by a nozzle plate 4 which has the outlet openings 3. The ink channel 2 is partially enclosed in a cylindrical shape by the drive element 5, 6. In the area of the drive element, the ink channel represents a so-called compression chamber. In the exemplary embodiment, the drive element consists of a winding 6, which is formed by many layers of a thin film with piezoelectric properties which is contacted on both sides over a large area, and which has one on the end faces and on the outer surfaces elastic material 5, which may for example be silicone rubber, is encased. The voltage pulses necessary for the operation of the piezoelectric drive element are applied via connections 7, 8, by means of which a change in the inner radius of the winding is effected depending on the polarity of the designed voltage and the direction of the polarization voltage of the piezoelectric material.

Die Fig. 2 und 3 zeigen jeweils ein Ausführungsbeispiel für den Wickel 6. Der in Fig. 2 dargestellte Wickel besteht aus mehreren Lagen einer dünnen, beidseitig großflächig kontaktierten Folie 9, z.B. Polyvenylidendifluouid PVDF. Er wird durch Aufwickeln von zwei aneinandergelegten Folien gebildet, wobei beide Folien piezoelektrisch aktiv sind. Wie in Fig. 3 dargestellt, kann eine der Folien durch eine Isolierschicht 10 ersetzt sein. In jedem Fall ist es jedoch wesentlich, daß zwischen den einzelnen Lagen des Wickels ein sehr guter Kontakt besteht. Das kann beispielsweise durch eine mechanische Vorspannung beim Aufwickeln der Folien oder durch ein dünnes Beschichten der Folien vor dem Wickelvorgang mit viskosen Klebstoffen oder Flüssigkeiten erreicht werden.2 and 3 each show an exemplary embodiment of the winding 6. The winding shown in FIG. 2 consists of several layers of a thin film 9, for example polyvinylidene difluoride PVDF, which is contacted on both sides over a large area. It is formed by winding two foils placed against one another, both foils being piezoelectrically active. As shown in FIG. 3, one of the foils can be replaced by an insulating layer 10. In any case, it is essential that between There is very good contact between the individual layers of the winding. This can be achieved, for example, by mechanical pre-tensioning when the films are wound up or by thinly coating the films with viscous adhesives or liquids before the winding process.

Der Wickel wird entweder direkt in den vergleichsweise starren Kunststoffkörper des Tintenspritzkopfes eingegossen, oder er wird, wie im Ausführungsbeispiel der Fig. 1, an den Stirnflächen und an den Außenflächen von einem elastischen Material, beispielsweise Siliconkautschuk, umhüllt.The winding is either poured directly into the comparatively rigid plastic body of the ink spray head, or, as in the exemplary embodiment in FIG. 1, it is encased on the end faces and on the outer surfaces by an elastic material, for example silicone rubber.

Zum Anschluß des Wickels an die Betriebsspannung dienen Elektroden, für die mit Vorteil Materialien mit niedrigem E-Modul hoher Duktilität sowie hoher elektrischer Leitfähigkeit Verwendung finden.Electrodes are used to connect the winding to the operating voltage, for which materials with low modulus of elasticity, high ductility and high electrical conductivity are advantageously used.

Mit einem erfindungsgemäß gestalteten Antriebselement, das über eine Breite von etwa 10mm einen Tintenkanal mit einem Durchmesser von etwa 0,8mm zylinderförmig umgibt, können bei einer Impulsspannung von 35V aus einer Auslaßöffnung mit einem Durchmesser von 40/u Tröpfchen mit einer Geschwindigkeit von 4m/sec ausgestoßen werden.With a drive element designed according to the invention, which surrounds an ink channel with a diameter of approximately 0.8 mm in a cylindrical shape over a width of approximately 10 mm, droplets at a pulse voltage of 35 V from an outlet opening with a diameter of 40 / u can be driven at a speed of 4 m / sec be expelled.

Claims (8)

1. Piezoelektrisches Antriebselement für Schreibdüsen insbesondere in Tintenmosaikschreibeinrichtungen, bei denen eine in einer von dem Antriebselement zylinderförmig umfaßten Kompressionskammer enthaltene Schreibflüssigkeit durch eine steuerbare Veränderung des Raumes der Kompressionskammer tröpfchenförmig ausgestoßen wird, dadurch gekennzeichnet , daß das Antriebselement ein aus mehreren Lagen einer beidseitig großflächig kontaktierten Folie (9) mit piezoelektrischen Eigenschaften bestehender Wickel (6) ist.1. Piezoelectric drive element for writing nozzles, in particular in ink mosaic writing devices, in which a writing fluid contained in a compression chamber which is encircled by the drive element is ejected in droplets by a controllable change in the space of the compression chamber, characterized in that the drive element is a film made up of several layers of a contact on both sides (9) with existing piezoelectric properties (6). 2. Antriebselement nach Anspruch 1, dadurch gekennzeichnet , die Lagen des Wickels (6) aus aneinandergelegten beidseitig kontaktierten Folien (9) mit piezoelektrischen Eigenschaften besteht.2. Drive element according to claim 1, characterized in that the layers of the winding (6) consist of mutually connected films contacted on both sides (9) with piezoelectric properties. 3. Antriebselement nach Anspruch 1, dadurch gekennzeichnet , daß die Lagen des Wickels (6) aus einer beidseitig kontaktierten Folie (9) mit piezoelektrischen Eigenschaften und einer Isolierfolie (10) besteht.3. Drive element according to claim 1, characterized in that the layers of the winding (6) consists of a film (9) contacted on both sides with piezoelectric properties and an insulating film (10). 4. Antriebselement nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet , daß als Folie (9) eine Folie aus Polyvenylidendifluouid (PVDF) verwendet wird.4. Drive element according to one of claims 1 to 3, characterized in that a film made of polyvinylidene difluoride (PVDF) is used as the film (9). 5. Antriebselement nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet , daß die den Wickel (6) bildenden Folien (9,10) mit einem viskosen Klebstoff beschichtet sind.5. Drive element according to one of claims 1 to 4, characterized in that the films (9, 10) forming the winding (6) are coated with a viscous adhesive. 6. Antriebselement nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet , daß der Wickel (6) in das die Kompressionskammer umgebende Gehäuse (1) eingegossen ist.6. Drive element according to one of claims 1 to 5, characterized in that the winding (6) is cast into the housing (1) surrounding the compression chamber. 7. Antriebselement nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet , daß der Wickel (6) an seiner Stirnfläche und an seinen Außenflächen von einem elastischen Material (5) umhüllt ist.7. Drive element according to one of claims 1 to 6, characterized in that the winding (6) is encased on its end face and on its outer surfaces by an elastic material (5). 8. Antriebselement nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet , daß der Wickel (6) Elektroden (7,8) zum Anschließen an eine Betriebsspannungsquelle aufweist, und daß das Elektrodenmaterial einen niedrigen E-Modul, eine hohe Duktilität und eine hohe elektrische Leitfähigkeit besitzt.8. Drive element according to one of claims 1 to 7, characterized in that the winding (6) electrodes (7,8) for connection to an operating voltage source, and that the electrode material has a low modulus of elasticity, high ductility and high electrical Has conductivity.
EP80103791A 1979-07-05 1980-07-03 Piezoelectric drive element for the printing nozzles in mosaic ink-printer units Withdrawn EP0022254A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2927269 1979-07-05
DE2927269A DE2927269C2 (en) 1979-07-05 1979-07-05 Piezoelectric drive element for writing nozzles in ink mosaic writing devices

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EP0022254A1 true EP0022254A1 (en) 1981-01-14

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EP80103791A Withdrawn EP0022254A1 (en) 1979-07-05 1980-07-03 Piezoelectric drive element for the printing nozzles in mosaic ink-printer units

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US (1) US4379246A (en)
EP (1) EP0022254A1 (en)
JP (1) JPS5611268A (en)
DE (1) DE2927269C2 (en)

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GB2275447A (en) * 1993-02-24 1994-08-31 Videojet Ltd Ink-resistant seals between components of an ink-jet print head.

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DE3217248C2 (en) * 1982-05-07 1986-01-02 Siemens AG, 1000 Berlin und 8000 München Arrangement for ejecting ink droplets
US4588998A (en) * 1983-07-27 1986-05-13 Ricoh Company, Ltd. Ink jet head having curved ink
DE3504011A1 (en) * 1985-02-06 1986-08-07 Siemens AG, 1000 Berlin und 8000 München Making contact with oscillating components by means of conductive rubber
US4742365A (en) * 1986-04-23 1988-05-03 Am International, Inc. Ink jet apparatus
US5652609A (en) * 1993-06-09 1997-07-29 J. David Scholler Recording device using an electret transducer
WO2003079409A2 (en) * 2002-03-15 2003-09-25 United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Electro-active device using radial electric field piezo-diaphragm for control of fluid movement
US7045934B2 (en) * 2002-04-11 2006-05-16 Ernest Geskin Method for jet formation and the apparatus for the same

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2275447A (en) * 1993-02-24 1994-08-31 Videojet Ltd Ink-resistant seals between components of an ink-jet print head.
US5589863A (en) * 1993-02-24 1996-12-31 Videojet Systems International, Inc. Ink jet droplet generator

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DE2927269A1 (en) 1981-01-15
DE2927269C2 (en) 1982-10-28
US4379246A (en) 1983-04-05
JPS5611268A (en) 1981-02-04

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