EP0103841A2 - Write head with piezoelectric driving elements for ink recording devices - Google Patents

Write head with piezoelectric driving elements for ink recording devices Download PDF

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Publication number
EP0103841A2
EP0103841A2 EP83109041A EP83109041A EP0103841A2 EP 0103841 A2 EP0103841 A2 EP 0103841A2 EP 83109041 A EP83109041 A EP 83109041A EP 83109041 A EP83109041 A EP 83109041A EP 0103841 A2 EP0103841 A2 EP 0103841A2
Authority
EP
European Patent Office
Prior art keywords
piezo
tube group
ink
piezo tube
transducers
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Withdrawn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
EP83109041A
Other languages
German (de)
French (fr)
Other versions
EP0103841A3 (en
Inventor
Erich Dipl.-Ing. Kattner
Kurt Herzog
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
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0103841A2 publication Critical patent/EP0103841A2/en
Publication of EP0103841A3 publication Critical patent/EP0103841A3/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Withdrawn legal-status Critical Current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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/42—Piezoelectric device making
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49169—Assembling electrical component directly to terminal or elongated conductor
    • Y10T29/49171—Assembling electrical component directly to terminal or elongated conductor with encapsulating
    • Y10T29/49172—Assembling electrical component directly to terminal or elongated conductor with encapsulating by molding of insulating material

Definitions

  • the invention relates to a writing head for ink writing devices according to the preamble of patent claim 1.
  • a writing head for ink writing devices which contains a plurality of writing nozzles in the form of ink channels which receive writing fluid and which are formed by shaping the writing head.
  • the individual ink channels run in the direction of a nozzle plate that closes the ink channels toward one another in the form of a beam.
  • Piezoelectric drive elements are arranged offset to the rear as seen from the outlet openings and comprise the ink channels in a cylindrical shape. A drop-by-drop ejection of writing fluid takes place through piezoelectric deformation of the piezoelectric drive element acting on the ink channel in question.
  • Such a structure makes it possible to manufacture the write head by casting the drive elements while simultaneously forming the ink channels.
  • the object of the invention is to provide a write head which, owing to its construction, enables a considerably simpler manufacture, while at the same time ensuring a good, i.e. Trouble-free use is required. Quality with regard to the formation of the ink channels is guaranteed and the contacting of the piezo elements is further improved.
  • the advantages which can be achieved with the measures according to the invention consist primarily in the fact that the functional parts of the write head which are decisive for practical writing operation are each manufactured as individual parts and can be checked for their mechanical as well as their electrical properties before final assembly, for example. Furthermore, when using the invention, there are improvements in terms of contacting, in that the problems associated therewith, particularly with regard to contacting the inner electrode of the piezo transducers, are considerably simplified and contacting is at the same time more reliable can be made. For example, a previously required wire coil between the ink channel and the piezo converter is no longer necessary.
  • the individual parts can advantageously be produced in the so-called injection molding process using thermoplastic material, which leads to short mold usage times at a low mold temperature.
  • Figure 1 shows a printhead for ink pens with the details necessary for understanding the invention. To clarify the structure, a representation has been chosen in which the upper housing cover has been removed.
  • the write head has seven ink channels 1, which end at a nozzle plate 2 in the shape of a beam.
  • the recording medium 3 is located in front of this.
  • Each ink channel 1 is surrounded by a tubular piezo transducer 4 at an area remote from the nozzle plate 2. From there, the ink channels 1 lead further to an ink supply system, not shown here.
  • the seven ink channels 1 are arranged in one plane, for example in such a way that the seven outlet openings of the individual ink channels lie one above the other on the nozzle plate 2.
  • the ink channels 1 are combined with the piezo transducers 4 assigned to each ink channel to form a piezo tube group.
  • the piezo tube group which can be produced as a single part, preferably by injection molding from thermoplastic material, has a web 5 and at its front end facing the nozzle plate 2 has a conical surface 6 for covering the ink channels 7.
  • the front end of the write head facing the recording medium 3 is formed by a front housing part 8, which serves both as a holder for the ink channel orifices 7 and also has the temperature sensing and heating element required for heating the nozzle plate 2.
  • the piezo tube group is covered by a housing cover, which cannot be seen from FIG. 1, in which the contact elements for the connections of the piezo transducers are also located. Details of this are given below with reference to FIG. 2.
  • FIG. 2 shows an enlarged section through the write head according to FIG. 1, the same parts being designated with the same reference numerals.
  • the walls of the ink channels 1 of a piezo tube group are formed by a thermoplastic potting material, for which the requirements for good compatibility with the ink used or the requirement for flame resistance can be easily met.
  • the piezo transducers 4 of a piezo tube group comprise each ink channel 1, a protective layer 10 being provided between the ink channel 1 and the piezo transducer 4, which ensures reliable protection both against chemical influences and against electrical interference, for example against short circuits.
  • Each piezo transducer 4 is covered with a contact layer on its outer and on its inner lateral surface.
  • contact connections 12 are provided, which can be designed as conventional connection pins on the outside and which end in contact springs 13 on the inside. When the housing cap 11 is put on, it is pressed onto the electrode surfaces of the piezo transducer 4 and represents a reliable contact between the latter and the external connection pins 12.
  • the ink channels 1 of a piezo tube group are combined in the conical surface 6. This is shaped according to the front housing part 8 and can be fitted into it.
  • the front housing part 8 also contains a heat-conducting sheet 14 on which a temperature sensing element 15, for example a PTC thermistor and a heating element 16, for example a heating resistor, is attached.
  • the attachment can e.g. done by soldering.
  • the heat-conducting sheet 14 and the heating element 16 are inserted into the plastic front housing part 8, which also receives the piezo tube group.
  • a contact spring with an externally guided connecting pin is also advantageously used for contacting.
  • the front housing part 8 also forms the contact surface for the nozzle plate 2.
  • the heat-conducting sheet with temperature-sensing and heating element into the front housing part 8, and then to contact the contact surface e.g. machined after assembly to obtain an extremely smooth contact surface for the nozzle plate. This also exposes the heat-conducting sheet, which then lies directly on the nozzle plate.
  • Each piezo tube group is manufactured as a whole either by injection molding or by injection molding.
  • a special tool suitable for production by the injection molding process consists of two parts, each of which forms a type of half-shell. An example of this is shown in FIG. 3.
  • a channel needle 19 inserted into the two molded parts 17 and 18 corresponds in diameter to the inner diameter of an ink channel.
  • the wall thickness of the ink channel is determined by the dimensions of the molded parts.
  • the piezo transducers 4 are also inserted at the same time as the channel needle 19.
  • the casting compound is then injected via the filling opening 20.
  • the filling opening 20 is preferably arranged approximately in the middle of each ink channel of a piezo tube group, so that flow paths of approximately the same length result on both sides for each ink channel.
  • the writing head is assembled in such a way that the piezo tube group with its channel openings 7 is inserted into the front housing part 8. It is managed and held there.
  • the cover is ensured by the conical surface 6.
  • the housing cover caps 11 are placed, the contact springs 13 being pressed against the contact surfaces of the piezo transducers 4 and establishing the electrical contact.
  • the entire assembly can then be coated with a resin, e.g. be cast in a fast-curing plastic. This ensures reliable protection against moisture, mechanical damage, etc.
  • the invention was explained using an example in which the ink channels and the piezo transducers are arranged in the form of a piezo tube group in only one plane. However, it is within the scope of the invention to provide a plurality of piezo tube groups in a write head, which then form a so-called multi-row write head.

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

Abstract

In einem Schreibkopf für Tintenschreibeinrichtungen, bei denen ein tröpfchenweiser Tintenausstoß durch eine steuerbare Verformung piezoelektrischer Antriebselemente (4) bewirkt wird, sind die Tintenkanäle (1) und die ihnen zugeordneten piezoelektrischen Antriebselemente (4) zu einer Piezorohrgruppe zusammengefaßt, die als Einzelteil gefertigt wird; zur Aufnahme der Tintenkanalmündungen (7) ist ein vorderes Gehäuseteil (8) und zur Kontaktierung der piezoelektrischen Antriebselemente (4) ist eine Gehäusekappe (11) vorgesehen; die Gehäusekappe (11) weist Kontaktelemente (12,13) auf, die beim Aufsetzen der Gehäusekappe (11) federnd an die äußere Mantelfläche der piezoelektrischen Antriebselemente (4) der Piezorohrgruppe anliegen.

Figure imgaf001
The ink channels (1) and the piezoelectric drive elements (4) assigned to them are combined in a piezo tube group, which is manufactured as a single part, in a write head for ink writing devices in which a drop by drop of ink ejection is caused by a controllable deformation of piezoelectric drive elements (4); A front housing part (8) is provided for receiving the ink channel openings (7) and a housing cap (11) is provided for contacting the piezoelectric drive elements (4); the housing cap (11) has contact elements (12, 13) which, when the housing cap (11) is put on, bear resiliently against the outer circumferential surface of the piezoelectric drive elements (4) of the piezo tube group.
Figure imgaf001

Description

Die Erfindung betrifft einen Schreibkopf für Tintenschreibeinrichtungen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a writing head for ink writing devices according to the preamble of patent claim 1.

Aus der DE-PS 25 43 451 (VPA 75 P 2175) ist ein Schreibkopf für Tintenschreibeinrichtungen bekannt, der mehrere Schreibdüsen in Form von Schreibflüssigkeit aufnehmenden Tintenkanälen enthält, die durch Ausformung des Schreibkopfes gebildet sind. Die einzelnen Tintenkanäle verlaufen in Richtung zu einer, die Tintenkanäle abschließenden Düsenplatte strahlenförmig aufeinander zu. Piezoelektrische Antriebselemente sind von den Austrittsöffnungen aus gesehen nach hinten versetzt angeordnet und umfassen die Tintenkanäle zylinderförmig. Ein tröpfchenweiser Ausstoß von Schreibflüssigkeit erfolgt durch piezoelektrische Verformung des auf den betreffenden Tintenkanal einwirkenden piezoelektrischen Antriebselemits. Ein solcher Aufbau.gestattet es, den Schreibkopf durch Vergießen der Antriebselemente bei gleichzeitiger Ausformung der Tintenkanäle herzustellen. Allerdings ist damit insofern ein erheblicher Aufwand verbunden, als das Gießen des Schreibkopfes im Vakuum stattfinden muß, um die hohen Anforderungen, die vor allem an die Oberfläche des Tintenkanals gestellt werden, voll zu erfüllen. Weiterhin ist die genaue Einhaltung von vorgegebenen Parametern, wie Mischungsverhältnis und Temperatur der Gießmasse Voraussetzung für einen störungsfreien Einsatz im praktischen Schreibbetrieb. Trotzdem gelingt es nicht immer, eine lunkerfreie Ausbildung der Tintenkanäle zu erreichen. Damit verbundene Rauhigkeiten der Oberfläche der Tintenkanäle können zu Störungen im Betrieb führen, da dadurch z.B. die mechanische Kopplung zwischen Piezoelement und Tintenkanal verschlechtert wird, und da sich mitgeführte Luftteilchen in kleinsten Hohlräumen im Tintenkanal ansammeln können. Schließlich ergeben sich auch Probleme hinsichtlich der Kontaktierung der Piezoelemente, da diese bereits vor dem Vergießen des Schreibkopfes vorgenommen werden muß.From DE-PS 25 43 451 (VPA 75 P 2175) a writing head for ink writing devices is known which contains a plurality of writing nozzles in the form of ink channels which receive writing fluid and which are formed by shaping the writing head. The individual ink channels run in the direction of a nozzle plate that closes the ink channels toward one another in the form of a beam. Piezoelectric drive elements are arranged offset to the rear as seen from the outlet openings and comprise the ink channels in a cylindrical shape. A drop-by-drop ejection of writing fluid takes place through piezoelectric deformation of the piezoelectric drive element acting on the ink channel in question. Such a structure makes it possible to manufacture the write head by casting the drive elements while simultaneously forming the ink channels. However, this involves considerable effort in that the casting of the writing head must take place in a vacuum in order to fully meet the high demands which are placed above all on the surface of the ink channel. Furthermore, exact compliance with specified parameters, such as the mixing ratio and temperature of the casting compound, is a prerequisite for trouble-free use in practical writing operations. Still ge it is not always possible to achieve a void-free formation of the ink channels. Associated roughness of the surface of the ink channels can lead to malfunctions in operation, since, for example, the mechanical coupling between the piezo element and the ink channel is thereby deteriorated, and since entrained air particles can accumulate in the smallest voids in the ink channel. Finally, problems also arise with regard to the contacting of the piezo elements, since this must be done before the writing head is cast.

Die Erfindung stellt sich die Aufgabe, einen Schreibkopf anzugeben, der auf Grund seines Aufbaues eine erheblich einfachere Herstellung ermöglicht, wobei zugleich die für einen guten, d.h. störungsfreien Einsatz geforderte.Qualität hinsichtlich der Ausbildung der Tintenkanäle gewährleistet ist und wobei weiterhin die Kontaktierung der Piezoelemente verbessert ist.The object of the invention is to provide a write head which, owing to its construction, enables a considerably simpler manufacture, while at the same time ensuring a good, i.e. Trouble-free use is required. Quality with regard to the formation of the ink channels is guaranteed and the contacting of the piezo elements is further improved.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Patentanspruches 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of patent claim 1.

Weitere Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Further refinements of the invention are characterized in the subclaims.

Die mit den erfindungsgemäßen Maßnahmen erreichbaren Vorteile bestehen vor allem darin, daß die für einen praktischen Schreibbetrieb maßgebenden Funktionsteile des Schreibkopfes jeweils als Einzelteile gefertigt und z.B. bereits vor der Endmontage sowohl auf ihre mechanischen als auch auf ihre elektrischen Eigenschaften überprüft werden können. Weiterhin ergeben sich bei Anwendung der Erfindung insofern Verbesserungen hinsichtlich der Kontaktierung, als die damit verbundenen Probleme vor allem in Bezug auf die Kontaktierung der Innenelektrode der Piezowandler erheblich vereinfacht und die Kontaktierung zugleich sicherer gemacht werden kann. Eine z.B. bisher erforderliche Drahtwendel zwischen Tintenkanal und Piezowandler ist nicht mehr notwendig. Die Einzelteile lassen sich mit Vorteil im sog.. Spritzgußverfahren unter Verwendung von thermoplastischem Material herstellen, was zu kurzen Formbenutzungszeiten bei geringer Formtemperatur führt..The advantages which can be achieved with the measures according to the invention consist primarily in the fact that the functional parts of the write head which are decisive for practical writing operation are each manufactured as individual parts and can be checked for their mechanical as well as their electrical properties before final assembly, for example. Furthermore, when using the invention, there are improvements in terms of contacting, in that the problems associated therewith, particularly with regard to contacting the inner electrode of the piezo transducers, are considerably simplified and contacting is at the same time more reliable can be made. For example, a previously required wire coil between the ink channel and the piezo converter is no longer necessary. The individual parts can advantageously be produced in the so-called injection molding process using thermoplastic material, which leads to short mold usage times at a low mold temperature.

Weitere Einzelheiten der Erfindung werden im folgenden anhand der Zeichnungen erläutert. Dort zeigt

  • Fig. 1 ein Ausführungsbeispiel für einen Schreibkopf mit einer Piezorohrgruppe,
  • Fig. 2 eine Schnittdarstellung des Schreibkopfes nach Fig. 1 und
  • Fig. 3 ein Beispiel für ein Spritzwerkzeug zur Herstellung einer Piezorohrgruppe.
Further details of the invention are explained below with reference to the drawings. There shows
  • 1 shows an embodiment of a write head with a piezo tube group,
  • Fig. 2 is a sectional view of the write head of Fig. 1 and
  • Fig. 3 shows an example of an injection mold for producing a piezo tube group.

Fig. 1 zeigt einen Schreibkopf für Tintenschreibeinrichtungen mit den zum Verständnis der Erfindung erforderlichen Einzelheiten. Zur Verdeutlichung des Aufbaues ist eine Darstellung gewählt worden, bei der die obere Gehäuseabdekkung entfernt ist. Im Ausführungsbeispiel weist der Schreibkopf sieben Tintenkanäle 1 auf, die strahlenförmig aufeinander zulaufend an einer Düsenplatte 2 enden. Vor dieser befindet sich der Aufzeichnungsträger 3. Jeder Tintenkanal 1 ist an einem von der Düsenplatte 2 entfernten Bereich von einem röhrenförmigen Piezowandler 4 umfaßt. Von dort aus führen die Tintenkanäle 1 weiter zu einem hier nicht dargestellten Tintenversorgungssystem.Fi g . Figure 1 shows a printhead for ink pens with the details necessary for understanding the invention. To clarify the structure, a representation has been chosen in which the upper housing cover has been removed. In the exemplary embodiment, the write head has seven ink channels 1, which end at a nozzle plate 2 in the shape of a beam. The recording medium 3 is located in front of this. Each ink channel 1 is surrounded by a tubular piezo transducer 4 at an area remote from the nozzle plate 2. From there, the ink channels 1 lead further to an ink supply system, not shown here.

Im Ausführungsbeispiel sind die sieben Tintenkanäle 1 in einer Ebene angeordnet, beispielsweise derart, daß die sieben Austrittsöffnungen der einzelnen Tintenkanäle an der Düsenplatte 2 übereinanderliegen. Erfindungsgemäß sind die Tintenkanäle 1 zusammen mit den jedem Tintenkanal zugeordneten Piezowandler 4 zu einer Piezorohrgruppe zusammengefaßt. Die als Einzelteil, vorzugsweise im Spritzgußverfahren aus thermoplastischem Material herstellbare Piezorohrgruppe weist einen Steg 5 und an ihrem vorderen, der Düsenplatte 2 zugewandten Ende eine Kegelfläche 6 zur Abdeckung der Tintenkanäle 7 auf. Das vordere, dem Aufzeichnungsträger 3 zugewandte Ende des Schreibkopfes wird durch ein vorderes Gehäuseteil 8 gebildet, das sowohl als Halterung für die Tintenkanalmündungen 7 dient, als auch die zur Heizung der Düsenplatte 2 erforderlichen Temperaturfühl- und Heizelement aufweist. Die Piezorohrgruppe wird, was aus Fig. 1 nicht ersichtlich ist, durch eine Gehäuseabdeckung abgedeckt, in der sich auch die Kontaktelemente für die Anschlüsse der Piezowandler befinden. Einzelheiten hierzu werden im folgenden unter Bezugnahme auf Fig. 2 gegeben.In the exemplary embodiment, the seven ink channels 1 are arranged in one plane, for example in such a way that the seven outlet openings of the individual ink channels lie one above the other on the nozzle plate 2. According to the invention the ink channels 1 are combined with the piezo transducers 4 assigned to each ink channel to form a piezo tube group. The piezo tube group which can be produced as a single part, preferably by injection molding from thermoplastic material, has a web 5 and at its front end facing the nozzle plate 2 has a conical surface 6 for covering the ink channels 7. The front end of the write head facing the recording medium 3 is formed by a front housing part 8, which serves both as a holder for the ink channel orifices 7 and also has the temperature sensing and heating element required for heating the nozzle plate 2. The piezo tube group is covered by a housing cover, which cannot be seen from FIG. 1, in which the contact elements for the connections of the piezo transducers are also located. Details of this are given below with reference to FIG. 2.

Fig. 2 zeigt einen vergrößerten Schnitt durch den Schreibkopf nach Fig. 1, wobei gleiche Teile mit gleichen Bezugszeichen bezeichnet sind. Die Wandungen der Tintenkanäle 1 einer Piezorohrgruppe sind durch ein thermoplastisches Vergußmaterial gebildet, für das die Anforderungen nach guter Verträglichkeit mit der verwendeten Tinte oder die Forderung nach schwerer Entflammbarkeit ohne weiteres erfüllt werden können. Die Piezowandler 4 einer Piezorohrgruppe umfassen jeden Tintenkanal 1, wobei zwischen dem Tintenkanal 1 und dem Piezowandler 4 eine Schutzschicht 10 vorgesehen ist, die einen sicheren Schutz sowohl hinsichtlich chemischer Einflüsse als auch hinsichtlich elektrischer Störungen, beispielsweise gegen Kurzschlüsse sicher gewährleistet. Jeder Piezowandler 4 ist auf seiner Außen-und auf seiner Innenmantelfläche mit einer Kontaktschicht überzogen. Dadurch, daß sich die innere Kontaktschicht auch auf die äußere Mantelfläche erstreckt, ist es möglich, eine Kontaktierung von außen vorzusehen. Dazu sind in der die Piezorohrgruppe abdeckenden Gehäusekappe 11 jeweils Kontaktanschlüsse 12 vorgesehen, die nach außen hin als übliche Anschlußstifte ausgebildet sein können, und die nach innen hin in Kontaktfedern 13 enden. Bei Aufsetzen der Gehäusekappe 11 werden diese an die Elektrodenflächen der Piezowandler 4 angedrückt und stellen einen sicheren Kontakt zwischen diesen und den außen liegenden Anschlußstiften 12 dar.FIG. 2 shows an enlarged section through the write head according to FIG. 1, the same parts being designated with the same reference numerals. The walls of the ink channels 1 of a piezo tube group are formed by a thermoplastic potting material, for which the requirements for good compatibility with the ink used or the requirement for flame resistance can be easily met. The piezo transducers 4 of a piezo tube group comprise each ink channel 1, a protective layer 10 being provided between the ink channel 1 and the piezo transducer 4, which ensures reliable protection both against chemical influences and against electrical interference, for example against short circuits. Each piezo transducer 4 is covered with a contact layer on its outer and on its inner lateral surface. Because the inner contact layer also extends to the outer surface, it is possible to provide contacting from the outside. To do this In the housing cap 11 covering the piezo tube group, contact connections 12 are provided, which can be designed as conventional connection pins on the outside and which end in contact springs 13 on the inside. When the housing cap 11 is put on, it is pressed onto the electrode surfaces of the piezo transducer 4 and represents a reliable contact between the latter and the external connection pins 12.

Im vorderen Bereich des Schreibkopfes sind die Tintenkanäle 1 einer Piezorohrgruppe in der Kegelfläche 6 zusammengefaßt. Diese ist entsprechend dem vorderen Gehäuseteil 8 geformt und in dieses einpaßbar.In the front area of the print head, the ink channels 1 of a piezo tube group are combined in the conical surface 6. This is shaped according to the front housing part 8 and can be fitted into it.

Das vordere Gehäuseteil 8 enthält weiterhin ein Wärmeleitblech 14, auf das ein Temperaturfühlelement 15, beispielsweise ein Kaltleiter und ein Heizelement 16, beispielsweise ein Heizwiderstand befestigt ist. Die Befestigung kann z.B. durch Auflöten erfolgen. Im Ausführungsbeispiel ist das Wärmeleitblech 14 und das Heizelement 16 in den aus Kunststoff bestehenden vorderen Gehäuseteil 8 eingelegt, das auch die Piezorohrgruppe aufnimmt. Zur Kontaktierung findet vorteilhaft ebenfalls eine Kontaktfeder mit nach außen geführtem Anschlußstift Verwendung. Das vordere Gehäuseteil 8 bildet zugleich auch die Anlagefläche für die Düsenplatte 2.The front housing part 8 also contains a heat-conducting sheet 14 on which a temperature sensing element 15, for example a PTC thermistor and a heating element 16, for example a heating resistor, is attached. The attachment can e.g. done by soldering. In the exemplary embodiment, the heat-conducting sheet 14 and the heating element 16 are inserted into the plastic front housing part 8, which also receives the piezo tube group. A contact spring with an externally guided connecting pin is also advantageously used for contacting. The front housing part 8 also forms the contact surface for the nozzle plate 2.

Im Rahmen der Erfindung ist es auch möglich, das Wärmeleitblech mit Temperaturfühl- und Heizelement in das vordere Gehäuseteil 8 einzuspritzen, und die Anlagefläche danach z.B. nach der Montage spanend zu bearbeiten, um eine äusserst glatte Anlagefläche für die Düsenplatte zu erhalten. Dabei wird auch das Wärmeleitblech freigelegt, das dann unmittelbar an der Düsenplatte anliegt.In the context of the invention, it is also possible to inject the heat-conducting sheet with temperature-sensing and heating element into the front housing part 8, and then to contact the contact surface e.g. machined after assembly to obtain an extremely smooth contact surface for the nozzle plate. This also exposes the heat-conducting sheet, which then lies directly on the nozzle plate.

Jede Piezorohrgruppe wird als Ganzes entweder im Spritzgußverfahren oder im Spritzpressverfahren hergestellt. Ein für die Herstellung nach dem Spritzgußverfahren geeignetes spezielles Werkzeug besteht aus zwei Teilen, die jeweils eine Art Halbschale bilden. Ein Beispiel dafür zeigt Fig. 3. Eine in die beiden zusammengelegten Formteile 17 und 18 eingelegte Kanalnadel 19 entspricht in ihrem Durchmesser dem inneren Durchmesser eines Tintenkanals. Die Wandstärke des Tintenkanals ist durch die Abmessungen der Formteile bestimmt. Zugleich mit der Kanalnadel 19 werden auch die Piezowandler 4 eingelegt. Über die Einfüllöffnung 20 wird dann die Gießmasse eingespritzt. Die Einfüllöffnung 20 ist vorzugsweise etwa in der Mitte jedes Tin-tenkanals einer Piezorohrgruppe angeordnet, so daß sich für jeden Tintenkanal nach beiden Seiten hin etwa gleich lange Fließwege ergeben. Damit wird die im Spalt zwischen der Kanalnadel 19 und den Wandungen der Formteile 17, 18 bewegte Luft beidseitig nach außen gedrückt. Um ein Verbiegen der Kanalnadel 19 während des Spritzvorganges sicher zu vermeiden, kann es vorteilhaft sein, die Tintenkanäle radial von zwei gegenüberliegenden Seiten aus zu spritzen.Each piezo tube group is manufactured as a whole either by injection molding or by injection molding. A special tool suitable for production by the injection molding process consists of two parts, each of which forms a type of half-shell. An example of this is shown in FIG. 3. A channel needle 19 inserted into the two molded parts 17 and 18 corresponds in diameter to the inner diameter of an ink channel. The wall thickness of the ink channel is determined by the dimensions of the molded parts. The piezo transducers 4 are also inserted at the same time as the channel needle 19. The casting compound is then injected via the filling opening 20. The filling opening 20 is preferably arranged approximately in the middle of each ink channel of a piezo tube group, so that flow paths of approximately the same length result on both sides for each ink channel. The air moving in the gap between the channel needle 19 and the walls of the molded parts 17, 18 is thus pressed outwards on both sides. In order to reliably prevent the channel needle 19 from bending during the spraying process, it may be advantageous to spray the ink channels radially from two opposite sides.

Der Zusammenbau des Schreibkopfes erfolgt in der Weise, daß die Piezorohrgruppe mit ihren Kanalmündungen 7 in das vordere Gehäuseteil 8 eingesteckt wird. Dort wird sie geführt und gehalten. Die Abdeckung ist durch die Kegelfläche 6 gewährleistet. Danach werden die Gehäuseabdeckkappen 11 aufgesetzt, wobei die Kontaktfedern 13 gegen die Kontaktflächen der Piezowandler 4 angedrückt werden und den elektrischen Kontakt herstellen. Die gesamte Anordnung kann dann mit.einem Gießharz, z.B. einem schnell härtenden Kunststoff vergossen werden. Damit ist ein sicherer Schutz gegen Feuchtigkeit, mechanische Beschädigungen usw. gewährleistet.The writing head is assembled in such a way that the piezo tube group with its channel openings 7 is inserted into the front housing part 8. It is managed and held there. The cover is ensured by the conical surface 6. Then the housing cover caps 11 are placed, the contact springs 13 being pressed against the contact surfaces of the piezo transducers 4 and establishing the electrical contact. The entire assembly can then be coated with a resin, e.g. be cast in a fast-curing plastic. This ensures reliable protection against moisture, mechanical damage, etc.

Die Erfindung wurde anhand eines Beispieles erläutert, bei dem die Tintenkanäle und die Piezowandler in Form einer Piezorohrgruppe in nur einer Ebene angeordnet sind. Es liegt jedoch im Rahmen der Erfindung, in einem Schreibkopf mehrere Piezorohrgruppen vorzusehen, die dann einen sogenannten Mehrreihenschreibkopf bilden.The invention was explained using an example in which the ink channels and the piezo transducers are arranged in the form of a piezo tube group in only one plane. However, it is within the scope of the invention to provide a plurality of piezo tube groups in a write head, which then form a so-called multi-row write head.

BezugszeichenlisteReference symbol list

  • 1 Tintenkanäle1 ink channels
  • 2 Düsenplatte2 nozzle plate
  • 3 Aufzeichnungsträger3 record carriers
  • 4 Piezowandler4 piezo transducers
  • 5 Steg5 bridge
  • 6 Kegelfläche6 conical surface
  • 7 Tintenkanalmündung7 ink channel mouth
  • 8 vorderes Gehäuseteil8 front housing part
  • 9 Wandungen9 walls
  • 10 Schutzschicht10 protective layer
  • 11 Gehäusekappe11 housing cap
  • 12 Kontaktanschlüsse12 contact connections
  • 13 Kontaktfedern13 contact springs
  • 14 Wärmeleitblech14 heat conducting plate
  • 15 Temperaturfühlelement15 temperature sensing element
  • 16 Heizelement16 heating element
  • Figure imgb0001
    Figure imgb0001
  • 19 Kanalnadel19 channel needle

Claims (8)

1. Schreibkopf für Tintenschreibeinrichtungen mit im Schreibkopf verlaufenden Tintenkanälen, die jeweils über einen Bereich ihrer Länge von einem Piezowandler umfaßt sind, und die an ihrem, dem Schreibbereich zugewandten Ende an einer Düsenplatte enden,
dadurch gekennzeichnet, daß die in einer Ebene im Schreibkopf verlaufenden Tintenkanäle (1) sowie die diesen zugeordneten Piezowandler (4) zu einer Piezorohrgruppe (1,4,5) zusammengefaßt sind,
daß die Wandstärke (9) der einzelnen Tintenkanäle (1) einer Piezorohrgruppe (1,4,5) im Bereich der Piezowandler (4) reduziert ist, und eine Schutzschicht (10) zwischen dem Tintenkanal (1) und dem betreffenden Piezowandler (4) bildet,
daß zur Aufnahme der Tintenkanalmündungen (7) der Piezorohrgruppe (1,4,5) ein vorderes Gehäuseteil (8) vorgesehen ist, in das die Tintenkanalmündungen (7) der Piezorohrgruppe (1,4,5) einsetzbar sind und gehalten werden, und daß eine Gehäusekappe (11) vorgesehen ist, die mindestens eine Piezorohrgruppe umfaßt und die Kontaktelemente (12,13) aufweist, über die eine Kontaktierung mit den Piezowandlern (4) der Piezorohrgruppe (1,4,5) besteht.1. writing head for ink writing devices with ink channels running in the writing head, each of which is covered by a piezo transducer over a region of its length, and which end at a nozzle plate at its end facing the writing region,
characterized in that the ink channels (1) running in one plane in the print head and the piezo transducers (4) assigned to them are combined to form a piezo tube group (1, 4, 5),
that the wall thickness (9) of the individual ink channels (1) of a piezo tube group (1, 4, 5) in the region of the piezo transducers (4) is reduced, and a protective layer (10) between the ink channel (1) and the relevant piezo transducer (4) educates
that a front housing part (8) is provided for receiving the ink channel mouths (7) of the piezo tube group (1,4,5), into which the ink channel mouths (7) of the piezo tube group (1,4,5) can be inserted and are held, and that a housing cap (11) is provided, which comprises at least one piezo tube group and has the contact elements (12, 13), via which contact is made with the piezo transducers (4) of the piezo tube group (1, 4, 5). 2. Schreibkopf nach Anspruch 1,
dadurch gekennzeichnet, daß die Wandungen (9) der Tintenkanäle (1) einer Piezorohrgruppe (1,4,5) aus thermoplastischem Material bestehen, daß die Piezowandler (4) der Piezorohrgruppe (1,4,5) teilweise vom thermoplastischen Material umgeben sind und gehalten werden, wobei mindestens ein Teilbereich der äußeren Mantelfläche der Piezowandler (4) vom thermoplastischen Material unbedeckt ist.2. printhead according to claim 1,
characterized in that the walls (9) of the ink channels (1) of a piezo tube group (1,4,5) consist of thermoplastic material, that the piezo transducers (4) of the piezo tube group (1,4,5) are partially surrounded by the thermoplastic material and are held, at least a portion of the outer surface of the piezo transducer (4) being uncovered by the thermoplastic material. 3. Schreibkopf nach Anspruch 2,
dadurch gekennzeichnet, daß die Kontaktanschlüsse für die Innen- und für die Außenelektrode der Piezowandler (4) einer Piezorohrgruppe (1,4,5) jeweils an der äußeren M ntelfläche des Piezowandlers (4) angeordnet sind,
und daß die an der Gehäusekappe (11) angeordneten und nach innen weisenden Kontaktelemente Kontaktfedern (13) sind, die nach Aufsetzen der Gehäusekappe (11) auf die Piezorohrgruppe (1,4,5) über außerhalb der Gehäusekappe (11) zugängliche Anschlüsse (12) die elektrische Verbindung zu den Piezowandlern (4) herstellen.3. write head according to claim 2,
characterized in that the contact connections for the inner and for the outer electrodes of the piezo transducers (4) of a piezo tube group (1, 4, 5) are each arranged on the outer surface of the piezo transducer (4),
and that the contact elements (13) which are arranged on the housing cap (11) and point inwards are contact springs (13) which, after the housing cap (11) has been placed on the piezo tube group (1, 4, 5), are accessible via connections (12 ) establish the electrical connection to the piezo transducers (4). 4. Schreibkopf nach Anspruch 2,
dadurch gekennzeichnet, daß die Tintenkanalmündungen (7) der Piezorohrgruppe (1,4,5) in einer Kegelfläche (6) verlaufend angeordnet sind, die Bestandteil der Piezorohrgruppe ist, und daß die äußere Form der Kegelfläche (6) an den die Tintenkanalmündungen (7) aufnehmenden Bereich im vorderen Gehäuseteil (8) angepaßt ist.4. printhead according to claim 2,
characterized in that the ink channel openings (7) of the piezo tube group (1, 4, 5) are arranged to run in a conical surface (6) which is part of the piezo tube group, and in that the outer shape of the conical surface (6) on which the ink channel openings (7 ) receiving area in the front housing part (8) is adapted. 5. Schreibkopf nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das vordere Gehäuseteil (8) des Schreibkopfes aus thermoplastischem Material besteht, in das ein Wärmeleitblech (14) mit auf diesem angeordneten Temperaturfühlelement (15) und -heizelementen (16) eingelegt ist,
und daß das vordere Gehäuseteil (8) eine Anlagefläche für die Düsenplatte (2) des Schreibkopfes bildet.5. Writing head according to one of claims 1 to 4, characterized in that the front housing part (8) of the writing head consists of thermoplastic material, in which a heat conducting plate (14) with temperature sensing element (15) and heating elements (16) arranged thereon is inserted is
and that the front housing part (8) forms a contact surface for the nozzle plate (2) of the write head. 6. Schreibkopf nach den Ansprüchen 1 bis §, dadurch gekennzeichnet, daß die Piezorohrgruppe (1,4,5,6), das vordere Gehäuseteil (8) und die Gehäusekappe (11) jeweils als Einzelteile im Spritzgußverfahren gefertigt sind.6. Writing head according to claims 1 to §, characterized in that the piezo tube group (1,4,5,6), the front housing part (8) and the housing cap (11) are each manufactured as individual parts by injection molding. 7. Schreibkopf nach Anspruch 6,
dadurch gekennzeichnet, daß zur Herstellung der Piezorohrgruppe (1,4,5,6) ein zweiteiliges Formteil (17,18) vorgesehen ist, wobei die Einfüllöffnung (20) für eine Spritz- oder Gießmasse in der Mitte mindestens eines der Formteile (17) angeordnet ist.7. printhead according to claim 6,
characterized in that a two-part molded part (17, 18) is provided for producing the piezo tube group (1, 4, 5, 6), the filler opening (20) for an injection or casting compound in the middle of at least one of the molded parts (17) is arranged. 8. Schreibkopf nach Anspruch 7,
dadurch gekennzeichnet, daß für jeden Tintenkanal mindestens eine Einfüllöffnung (20) vorgesehen ist.8. printhead according to claim 7,
characterized in that at least one fill opening (20) is provided for each ink channel.
EP83109041A 1982-09-16 1983-09-13 Write head with piezoelectric driving elements for ink recording devices Withdrawn EP0103841A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3234408 1982-09-16
DE3234408A DE3234408C2 (en) 1982-09-16 1982-09-16 Write head with piezoelectric drive elements for ink writing devices

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EP0103841A2 true EP0103841A2 (en) 1984-03-28
EP0103841A3 EP0103841A3 (en) 1985-08-21

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EP (1) EP0103841A3 (en)
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Also Published As

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JPS5973965A (en) 1984-04-26
EP0103841A3 (en) 1985-08-21
DE3234408A1 (en) 1984-03-22
US4504845A (en) 1985-03-12
DE3234408C2 (en) 1986-01-09

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