EP0327802A2 - Method for providing an ink jet print head with piezo crystals - Google Patents

Method for providing an ink jet print head with piezo crystals Download PDF

Info

Publication number
EP0327802A2
EP0327802A2 EP89100188A EP89100188A EP0327802A2 EP 0327802 A2 EP0327802 A2 EP 0327802A2 EP 89100188 A EP89100188 A EP 89100188A EP 89100188 A EP89100188 A EP 89100188A EP 0327802 A2 EP0327802 A2 EP 0327802A2
Authority
EP
European Patent Office
Prior art keywords
plate
piezoceramic
piezo
membrane
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.)
Withdrawn
Application number
EP89100188A
Other languages
German (de)
French (fr)
Other versions
EP0327802A3 (en
Inventor
Fred Dipl.-Ing. Johannsen
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.)
AEG Olympia Office GmbH
Original Assignee
AEG Olympia AG
AEG Olympia Office GmbH
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 AEG Olympia AG, AEG Olympia Office GmbH filed Critical AEG Olympia AG
Publication of EP0327802A2 publication Critical patent/EP0327802A2/en
Publication of EP0327802A3 publication Critical patent/EP0327802A3/en
Withdrawn legal-status Critical Current

Links

Images

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
    • B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
    • 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
    • B41J2002/14379—Edge shooter
    • 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
    • B41J2002/14403—Structure thereof only for on-demand ink jet heads including a filter
    • 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

Definitions

  • the invention relates to a method for equipping an inkjet print head with piezo crystals of the type specified in the preamble of claim 1.
  • the membrane plate is connected to a one-piece piezoceramic plate which can be locally activated in a targeted manner on its surface in the area of the individual pressure chambers.
  • the piezoceramic plate has elevations with electrodes in the area of the individual fluid chambers.
  • the respective elevations of the piezoceramic plate have flat dimensions which correspond to the dimensions of the pressure chambers arranged below them in a base plate. If these dimensions are reduced, so that the density of the ink channels or pressure chambers present in the base body can be increased, there are strong influences on the vibration behavior of the piezoceramic elevations when the electrode layers are contacted by means of electrical wires.
  • piezoceramic plate is also easy to assemble, but it is very expensive to manufacture. Since the individual piezocrystals are also all still firmly connected to the piezoceramic plate, a correspondingly high voltage is required to generate the volume reduction in the pressure chambers.
  • the invention has for its object to provide a method for equipping an ink jet print head with piezo crystals, which can be carried out easily and quickly and thereby ensures a safe and accurate positioning of the piezo crystals.
  • This object is achieved by the invention characterized in claim 1.
  • the method according to the invention is characterized in that the piezocrystals are no longer individually adjusted and assembled, but that they are to be handled as one part during assembly. Only after the piezoceramic plate has been attached to the membrane plate is the final separation of the piezocrystals from the piezoceramic plate. Each piezo crystal is then arranged to swing freely.
  • the advantageous embodiment of the inventive method according to claim 8 eliminates the risk of incorrect polarity due to the asymmetrical shape of the piezo crystal plate.
  • the positioning of the piezoceramic plate flush with the membrane plate of the inkjet printhead eliminates any positioning problems.
  • FIG. 1 shows a plate-shaped base body 1 of an ink jet print head 2 shown in section, in which a plurality of pressure chambers 3 filled with ink and these with outlet openings 4 and ink channels 6, 7 connecting an ink supply chamber 5 are arranged. At the transition points of the ink channels 7 to the ink supply chamber 5, filters 8 are arranged, which prevent air from penetrating into the pressure chambers 3.
  • a membrane plate 9, which is also made of glass, can be firmly connected to the base body 1 and covers the pressure chambers 3, the ink channels 6, 7 and the storage chamber 5 in a liquid-tight manner.
  • the likewise plate-shaped membrane plate 9 is provided on the side to be connected with a piezoceramic plate 10 with a zinc oxide layer 13.
  • the piezoceramic plate 10 is, for. B. firmly connected to the membrane plate 9 by means of an adhesive connection. Thereafter, individual piezocrystals 11 are separated from the piezoceramic plate 10 by means of parting lines produced by a separating device and are thus free-swinging.
  • the separator can, for. B. from a laser beam device, e.g. B. consist of a CO2 laser.
  • This separating device has the advantage that the material to be removed from the separating joints is evaporated.
  • a laser beam device is e.g. B. can be controlled via a numerical control device such that any geometric shape of the piezo crystals 11 can be generated.
  • the piezocrystals 11 are attached to the membrane before they are attached to the piezoceramic plate 10 plate 9 is already separated from the piezoceramic plate (10) except for at least one connecting web 12. The final separation of the piezo crystals 11 then takes place after the piezoceramic plate 10 has been fastened to the membrane plate 9 by severing the connecting webs by means of a separating device.
  • the base body 1, the membrane plate 9 and the piezoceramic plate 10 partially have the same outer contour, such that they can be mounted flush and connected to one another. This has the advantage that a separate positioning of the individual crystals is no longer necessary.
  • the plate-shaped base body 11 and the membrane plate 9 z. B. firmly connected to each other by means of an adhesive connection.
  • the membrane plate 9 was still covered with an electrically conductive layer, e.g. B. provided a nickel oxide layer 13.
  • the piezoceramic plate 10 already provided with laser cuts is also firmly connected to the membrane plate 9 by means of an adhesive connection.
  • the connecting webs 12 are then severed in the parting lines by means of a laser beam device, as a result of which the piezo crystals 11 arranged above each pressure chamber 3 are separated from the piezoceramic plate 10 and thus vibrate freely. All piezocrystals 11 of the inkjet print head 2 are thus assembled as an assembly part and glued to the membrane plate 9. Good adhesive dosing is ensured by means of a squeegee, screen printing or a spin process. The assembly method according to the invention also ensures the flatness of the piezo crystals 11 to the membrane plate 9 required for the same operating voltages.
  • the pressure chambers 3 and the ink channels 6, 7 and the ink supply chamber 5 are e.g. B. incorporated into the base body 1 by an etching process.
  • the membrane plate 9 designed as a glass face plate can also be connected to the base body by a sintering process.

Landscapes

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

Abstract

An ink jet printer head has a main plate with a number of chambers filled with ink and leading to channels connecting to an array of nozzles at the plate edge. Typically the plate is produced of glass and the chambers are enclosed by a diaphragm plate with a piezo-ceramic plate located above. The piezo-ceramic plate (10) has a number of piezo-crystals separately mounted on the surface that align with the ink pressure chambers in the main plate. When excited by pulses, the crystals generate ink droplets from the nozzles.

Description

Die Erfindung betrifft ein Verfahren zum Bestücken eines Tinten­strahldruckkopfes mit Piezokristallen der im Oberbegriff des Patentanspruchs 1 angegebenen Art.The invention relates to a method for equipping an inkjet print head with piezo crystals of the type specified in the preamble of claim 1.

Bei einem bekannten Spritzkopf (DE-A1 21 64 614) sind die flüs­sigkeitsgefüllten Kammern durch einzelne Membranen abgedeckt, welche aus dünnen Metallplatten bestehen. An diesen Metallplatten sind wiederum einzelne als elektromechanische Wandlereinrichtun­gen ausgebildete piezoelektrische Kristalle befestigt. Ein der­artiger Schreibkopf mit z. B. sieben Schreibeinheiten weist viele Einzelteile auf, die in mehreren Arbeitsgängen montiert werden müssen. Hierbei ist auch eine gewisse Geschicklichkeit von der die Montage ausführenden Bedienperson erforderlich, zumal die Abmessungen der aus piezoelektrischem Material bestehenden Plätt­chen sehr klein sind. Außerdem müssen die leicht zerbrechlichen Plättchen sehr genau montiert und justiert werden.In a known spray head (DE-A1 21 64 614), the liquid-filled chambers are covered by individual membranes, which consist of thin metal plates. In turn, individual piezoelectric crystals designed as electromechanical transducer devices are attached to these metal plates. Such a write head with z. B. seven writing units has many individual parts that have to be assembled in several operations. Here, a certain skill is required by the operator performing the assembly, especially since the dimensions of the platelets made of piezoelectric material are very small. In addition, the fragile plates have to be mounted and adjusted very precisely.

Die oben angeführten Nachteile werden durch die DE-A1 22 56 667 dadurch vermieden, daß die Membranplatte mit einer einstückigen Piezokeramikplatte verbunden ist, welche auf ihrer Oberfläche im Bereich der einzelnen Druckkammern angeordnete Elektroden gezielt örtlich aktivierbar ist. Hierbei weist die Piezokeramikplatte im Bereich der einzelnen Fluidkammern Erhebungen mit Elektroden auf. Die jeweiligen Erhebungen der Piezokeramikplatte besitzen dabei ebene Abmessungen, die den Abmessungen der unter ihnen in einer Grundplatte angeordneten Druckkammern entsprechen. Werden diese Abmessungen verringert, so daß auf diese Weise die Dichte der im Grundkörper vorhandenen Tintenkanäle bzw. Druckkammern erhöht werden kann, so treten bei der Kontaktierung der Elektroden­schichten mittels elektrischer Drähte starke Beeinflussungen des Schwingungsverhaltens der piezokeramischen Erhebungen auf. Diese bekannte Piezokeramikplatte ist auch leicht zu montieren, aber ihre Herstellung ist sehr teuer. Da die einzelnen Piezokristalle außerdem alle noch mit der Piezokeramikplatte fest verbunden sind, ist zur Erzeugung der Volumenverringerung in den Druck­kammern eine entsprechend hohe Spannung erforderlich.The above-mentioned disadvantages are avoided by DE-A1 22 56 667 in that the membrane plate is connected to a one-piece piezoceramic plate which can be locally activated in a targeted manner on its surface in the area of the individual pressure chambers. Here, the piezoceramic plate has elevations with electrodes in the area of the individual fluid chambers. The respective elevations of the piezoceramic plate have flat dimensions which correspond to the dimensions of the pressure chambers arranged below them in a base plate. If these dimensions are reduced, so that the density of the ink channels or pressure chambers present in the base body can be increased, there are strong influences on the vibration behavior of the piezoceramic elevations when the electrode layers are contacted by means of electrical wires. These well-known piezoceramic plate is also easy to assemble, but it is very expensive to manufacture. Since the individual piezocrystals are also all still firmly connected to the piezoceramic plate, a correspondingly high voltage is required to generate the volume reduction in the pressure chambers.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Be­stücken eines Tintenstrahldruckkopfes mit Piezokristallen zu schaffen, das einfach und schnell durchführbar ist und dabei eine sichere und genaue Positionierung der Piezokristalle gewähr­leistet. Diese Aufgabe wird durch die im Patentanspruch 1 ge­kennzeichnete Erfindung gelöst.The invention has for its object to provide a method for equipping an ink jet print head with piezo crystals, which can be carried out easily and quickly and thereby ensures a safe and accurate positioning of the piezo crystals. This object is achieved by the invention characterized in claim 1.

Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, daß die Piezokristalle nicht mehr einzeln justiert und montiert werden, sondern daß sie bei der Montage als ein Teil zu handhaben sind. Erst nach der Befestigung der Piezokeramikplatte mit der Membran­platte erfolgt die endgültige Trennung der Piezokristalle von der Piezokeramikplatte. Jedes Piezokristall ist dann allein frei schwingend angeordnet.The method according to the invention is characterized in that the piezocrystals are no longer individually adjusted and assembled, but that they are to be handled as one part during assembly. Only after the piezoceramic plate has been attached to the membrane plate is the final separation of the piezocrystals from the piezoceramic plate. Each piezo crystal is then arranged to swing freely.

Durch die vorteilhafte Ausgestaltung des erfindungsgemäßen Ver­fahrens nach Anspruch 8 wird die Gefahr der falschen Polung durch die asymmetrische Form der Piezokristallplatte ausgeschlossen. Durch das bündige Aufbringen der Piezokeramikplatte auf die Membranplatte des Tintenstrahldruckkopfes entfallen jegliche Positionierprobleme.The advantageous embodiment of the inventive method according to claim 8 eliminates the risk of incorrect polarity due to the asymmetrical shape of the piezo crystal plate. The positioning of the piezoceramic plate flush with the membrane plate of the inkjet printhead eliminates any positioning problems.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Ver­fahrens sind den weiteren Unteransprüchen zu entnehmen.Further advantageous refinements of the method according to the invention can be found in the further subclaims.

Die Erfindung wird im folgenden anhand des Ausführungsbeispiels und der Zeichnungen näher erläutert. Es zeigt

  • Figur 1 eine Draufsicht auf einen plattenförmigen Grundkörper mit Tintenkanälen und Druckkammern,
  • Figur 2 Einzelteile des Tintenstrahldruckkopfes und
  • Figur 3 eine Draufsicht auf den Tintenstrahldruckkopf nach Trennung der Piezokristalle von der Piezokeramikplatte.
The invention is explained in more detail below with the aid of the exemplary embodiment and the drawings. It shows
  • FIG. 1 shows a plan view of a plate-shaped base body with ink channels and pressure chambers,
  • Figure 2 items of the inkjet printhead and
  • Figure 3 is a plan view of the ink jet print head after separation of the piezo crystals from the piezoceramic plate.

In der Figur 1 ist ein plattenförmiger Grundkörper 1 eines im Schnitt dargestellten Tintenstrahldruckkopfes 2 dargestellt, in welchem mehrere mit Tinte gefüllte Druckkammern 3 und diese mit Austrittsöffnungen 4 und mit einer Tintenversorgungskammer 5 ver­bindende Tintenkanäle 6, 7 angeordnet sind. An den Übergangs­stellen der Tintenkanäle 7 zu der Tintenvorratskammer 5 sind jeweils Filter 8 angeordnet, welche ein Eindringen von Luft in die Druckkammern 3 verhindern. Mit dem Grundkörper 1 ist eine ebenfalls aus Glas bestehende Membranplatte 9 fest verbindbar, welche die Druckkammern 3, die Tintenkanäle 6, 7 und die Vorrats­kammer 5 flüssigkeitsdicht abdeckt. Die ebenfalls plattenförmig ausgebildete Membranplatte 9 ist auf der mit einer Piezokeramik­platte 10 zu verbindenden Seite mit einer Zinkoxydschicht 13 ver­sehen. Die Piezokeramikplatte 10 wird z. B. mittels einer Klebe­verbindung fest mit der Membranplatte 9 verbunden. Danach werden einzelne Piezokristalle 11 mittels durch eine Trennvorrichtung erzeugte Trennfugen von der Piezokeramikplatte 10 getrennt und dadurch freischwingend.1 shows a plate-shaped base body 1 of an ink jet print head 2 shown in section, in which a plurality of pressure chambers 3 filled with ink and these with outlet openings 4 and ink channels 6, 7 connecting an ink supply chamber 5 are arranged. At the transition points of the ink channels 7 to the ink supply chamber 5, filters 8 are arranged, which prevent air from penetrating into the pressure chambers 3. A membrane plate 9, which is also made of glass, can be firmly connected to the base body 1 and covers the pressure chambers 3, the ink channels 6, 7 and the storage chamber 5 in a liquid-tight manner. The likewise plate-shaped membrane plate 9 is provided on the side to be connected with a piezoceramic plate 10 with a zinc oxide layer 13. The piezoceramic plate 10 is, for. B. firmly connected to the membrane plate 9 by means of an adhesive connection. Thereafter, individual piezocrystals 11 are separated from the piezoceramic plate 10 by means of parting lines produced by a separating device and are thus free-swinging.

Die Trennvorrichtung kann z. B. aus einer Laserstrahlvorrichtung, z. B. aus einem CO₂-Laser bestehen. Diese Trennvorrichtung hat den Vorteil, daß das aus den Trennfugen zu entfernende Material verdampft wird. Im Rahmen der Erfindung ist es selbstverständlich auch möglich, entsprechende Trennschleifmaschinen einzusetzen. Allerdings ist eine Laserstrahlvorrichtung z. B. über eine nume­rische Steuervorrichtung derart ansteuerbar, daß jede beliebige geometrische Form der Piezokristalle 11 erzeugbar ist.The separator can, for. B. from a laser beam device, e.g. B. consist of a CO₂ laser. This separating device has the advantage that the material to be removed from the separating joints is evaporated. Within the scope of the invention it is of course also possible to use corresponding cut-off machines. However, a laser beam device is e.g. B. can be controlled via a numerical control device such that any geometric shape of the piezo crystals 11 can be generated.

In vorteilhafter Ausgestaltung werden die Piezokristalle 11 vor ihrer Befestigung mit der Piezokeramikplatte 10 mit der Membran­ platte 9 bis auf mindestens je einen Verbindungssteg 12 von der Piezokeramikplatte (10) bereits getrennt. Die endgültige Trennung der Piezokristalle 11 erfolgt dann nach der Befestigung der Piezokeramikplatte 10 mit der Membranplatte 9 durch Durchtrennen der Verbindungsstege mittels einer Trennvorrichtung. Dies hat den Vorteil, daß die als Leitschicht dienende Zinkoxydschicht 13 auf der Membranplatte 9 nicht so zerstört wird, daß die elektrische Leitverbindung zu den einzelnen Piezokristallen 11 unterbrochen ist.In an advantageous embodiment, the piezocrystals 11 are attached to the membrane before they are attached to the piezoceramic plate 10 plate 9 is already separated from the piezoceramic plate (10) except for at least one connecting web 12. The final separation of the piezo crystals 11 then takes place after the piezoceramic plate 10 has been fastened to the membrane plate 9 by severing the connecting webs by means of a separating device. This has the advantage that the zinc oxide layer 13 serving as the conductive layer on the membrane plate 9 is not destroyed in such a way that the electrical conductive connection to the individual piezo crystals 11 is interrupted.

Der Grundkörper 1, die Membranplatte 9 und die Piezokeramikplatte 10 weisen teilweise die gleiche Außenkontur auf, derart, daß sie bündig montiert und miteinander verbunden werden können. Dieses hat den Vorteil, daß eine getrennte Positionierung der einzelnen Kristalle nicht mehr erforderlich ist. Bevor der Tintenstrahlkopf 2 mit Piezokristallen bestückt wird, werden der plattenförmige Grundkörper 11 und die Membranplatte 9 z. B. mittels einer Klebe­verbindung fest miteinander verbunden. Vor dieser Klebeverbindung wurde die Membranplatte 9 noch mit einer elektrisch leitenden Schicht, z. B. einer Nickeloxydschicht 13 versehen. Danach wird die bereits mit Laserschnitten versehene Piezokeramikplatte 10 ebenfalls mittels einer Klebeverbindung mit der Membranplatte 9 fest verbunden. Danach werden die Verbindungsstege 12 in den Trennfugen mittels einer Laserstrahlvorrichtung durchgetrennt, wodurch die über jede Druckkammer 3 angeordneten Piezokristalle 11 von der Piezokeramikplatte 10 abgetrennt und damit frei schwingend werden. Alle Piezokristalle 11 des Tintenstrahldruck­kopfes 2 werden also als ein Montagenteil zusammenmontiert und mit der Membranplatte 9 verklebt. Eine gute Klebedosierung wird mittels Rakel, Siebdruck oder durch ein Schleuderverfahren ge­währleistet. Das erfindungsgemäße Bestückungsverfahren gewähr­leistet auch die für gleiche Betriebsspannungen erforderliche Planlage der Piezokristalle 11 zur Membranplatte 9. Die Druck­kammern 3 und die Tintenkanäle 6, 7 und die Tintenvorratskammer 5 werden z. B. durch ein Ätzverfahren in den Grundkörper 1 einge­arbeitet. Die Verbindung der als Glasplanscheibe ausgebildeten Membranplatte 9 mit dem Grundkörper kann auch durch ein Sinter­verfahren erfolgen.The base body 1, the membrane plate 9 and the piezoceramic plate 10 partially have the same outer contour, such that they can be mounted flush and connected to one another. This has the advantage that a separate positioning of the individual crystals is no longer necessary. Before the ink jet head 2 is equipped with piezo crystals, the plate-shaped base body 11 and the membrane plate 9 z. B. firmly connected to each other by means of an adhesive connection. Before this adhesive connection, the membrane plate 9 was still covered with an electrically conductive layer, e.g. B. provided a nickel oxide layer 13. Thereafter, the piezoceramic plate 10 already provided with laser cuts is also firmly connected to the membrane plate 9 by means of an adhesive connection. The connecting webs 12 are then severed in the parting lines by means of a laser beam device, as a result of which the piezo crystals 11 arranged above each pressure chamber 3 are separated from the piezoceramic plate 10 and thus vibrate freely. All piezocrystals 11 of the inkjet print head 2 are thus assembled as an assembly part and glued to the membrane plate 9. Good adhesive dosing is ensured by means of a squeegee, screen printing or a spin process. The assembly method according to the invention also ensures the flatness of the piezo crystals 11 to the membrane plate 9 required for the same operating voltages. The pressure chambers 3 and the ink channels 6, 7 and the ink supply chamber 5 are e.g. B. incorporated into the base body 1 by an etching process. The membrane plate 9 designed as a glass face plate can also be connected to the base body by a sintering process.

Claims (8)

1. Verfahren zum Bestücken eines Tintenstrahldruckkopfes mit Piezokristallen, wobei der Tintenstrahldruckkopf mindestens einen plattenförmigen Grundkörper, in welchem mehrere mit Tinte gefüllte Druckkammern und diese mit Austrittsöffnungen und mit einer Tintenversorgungskammer verbundene Tinten­kanäle angeordnet sind, und eine Membranplatte aufweist, die mit der Grundplatte fest verbunden ist und zur Volumenmin­derung der Druckkammern durch über den Druckkammern auf der Membranplatte angeordnete Piezokristalle beaufschlagt wird, dadurch gekennzeichnet, daß die mit dem platten­förmigen Grundkörper (1) verbundene Membranplatte (9) eine Piezokristallplatte (10) z. B. mittels einer Klebeverbindung fest angeordnet wird und daß danach je ein frei schwingendes Piezokristall (11) über jede Druckkammer (3) mittels durch eine Trennvorrichtung erzeugte Trennfugen von der Piezo­keramikplatte (10) abgetrennt wird.1. A method for equipping an ink jet print head with piezo crystals, wherein the ink jet print head has at least one plate-shaped base body, in which a plurality of ink-filled pressure chambers and these are arranged with outlet openings and an ink supply chamber connected to ink channels, and a membrane plate which is fixedly connected to the base plate and to reduce the volume of the pressure chambers by means of piezo crystals arranged above the pressure chambers on the membrane plate, characterized in that the membrane plate (9) connected to the plate-shaped base body (1) comprises a piezo crystal plate (10) z. B. is fixedly arranged by means of an adhesive connection and that thereafter a freely vibrating piezo crystal (11) is separated from the piezoceramic plate (10) by means of separating joints generated by a separating device via each pressure chamber (3). 2. Verfahren nach Anspruch 1, dadurch gekennzeich­net, daß die Piezokristalle (11) vor der Befestigung der Piezokeramikplatte (10) mit der Membranplatte (9) bis auf mindestens je einen Verbindungssteg (12) von der Piezoke­ramikplatte (10) getrennt werden und daß die Verbindungs­stege (12) nach der Befestigung der Piezokeramikplatte (10) mit der Membranplatte (9) durch eine Trennvorrichtung durch­trennt werden.2. The method according to claim 1, characterized in that the piezocrystals (11) prior to attachment of the piezoceramic plate (10) with the membrane plate (9) to at least one connecting web (12) from the piezoceramic plate (10) are separated and that After the piezoceramic plate (10) is fastened to the membrane plate (9), connecting webs (12) are severed by a separating device. 3. Verfahren nach Anspruch 1, oder 2, dadurch gekenn­zeichnet, daß die Trennvorrichtung aus einer Laser­strahlvorrichtung, z. B. aus einem CO₂-Laser besteht.3. The method according to claim 1, or 2, characterized in that the separating device from a laser beam device, for. B. consists of a CO₂ laser. 4. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekenn­zeichnet, daß die Trennvorrichtung über eine numerische Steuervorrichtung derart ansteuerbar ist, daß jede beliebige geometrische Form der Piezokristalle (11) erzeugbar ist.4. The method according to claim 1, 2 or 3, characterized in that the separating device can be controlled via a numerical control device such that any geometric shape of the piezo crystals (11) can be generated. 5. Verfahren nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß die durchzutrennenden Verbindungsstege (12) so angeordnet werden, daß unterhalb dieser Verbindungsstege (12) keine Hohlräume in dem Grund­körper (1) vorhanden sind.5. The method according to any one of the preceding claims, characterized in that the connecting webs to be cut (12) are arranged so that no cavities are present in the base body (1) below these connecting webs (12). 6. Verfahren nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß die Piezokristalle (11) rechteckig oder rautenförmig ausgebildet sind.6. The method according to any one of the preceding claims, characterized in that the piezo crystals (11) are rectangular or diamond-shaped. 7. Verfahren nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß die plattenförmige Membranplatte (9) aus Glas besteht und auf der mit der Piezokeramikplatte (10) zu verbindenden Seite eine Zinkoxyd­schicht (13) aufweist.7. The method according to any one of the preceding claims, characterized in that the plate-shaped membrane plate (9) consists of glass and on the side to be connected to the piezoceramic plate (10) has a zinc oxide layer (13). 8. Verfahren nach einem der vorhergehenden Ansprüche, da­durch gekennzeichnet, daß der Grundkörper (1), die Membranplatte (9) und die Piezokeramikplatte (10) teil­weise die gleiche Außenkontur aufweisen, derart, daß sie bündig montiert und miteinander verbunden werden können.8. The method according to any one of the preceding claims, characterized in that the base body (1), the membrane plate (9) and the piezoceramic plate (10) partially have the same outer contour, such that they can be mounted flush and connected to each other.
EP89100188A 1988-02-11 1989-01-07 Method for providing an ink jet print head with piezo crystals Withdrawn EP0327802A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3804165 1988-02-11
DE3804165A DE3804165A1 (en) 1988-02-11 1988-02-11 METHOD FOR EQUIPPING AN INK JET PRINT HEAD WITH PIEZO CRYSTALS

Publications (2)

Publication Number Publication Date
EP0327802A2 true EP0327802A2 (en) 1989-08-16
EP0327802A3 EP0327802A3 (en) 1990-01-31

Family

ID=6347144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89100188A Withdrawn EP0327802A3 (en) 1988-02-11 1989-01-07 Method for providing an ink jet print head with piezo crystals

Country Status (4)

Country Link
US (1) US4897903A (en)
EP (1) EP0327802A3 (en)
JP (1) JPH024518A (en)
DE (1) DE3804165A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2713144A1 (en) * 1993-11-30 1995-06-09 Rohm Co Ltd Inkjet print head and printer.

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0714797B2 (en) * 1990-11-30 1995-02-22 株式会社キトー Electric chain block
DE4225799A1 (en) * 1992-07-31 1994-02-03 Francotyp Postalia Gmbh Inkjet printhead and process for its manufacture
US5825382A (en) * 1992-07-31 1998-10-20 Francotyp-Postalia Ag & Co. Edge-shooter ink jet print head and method for its manufacture
US6050679A (en) * 1992-08-27 2000-04-18 Hitachi Koki Imaging Solutions, Inc. Ink jet printer transducer array with stacked or single flat plate element
DE59509149D1 (en) 1994-08-03 2001-05-10 Francotyp Postalia Gmbh Arrangement for plate-shaped piezo actuators and method for their production
GB9808182D0 (en) * 1998-04-17 1998-06-17 The Technology Partnership Plc Liquid projection apparatus
DE19931110A1 (en) * 1999-07-06 2001-01-25 Ekra Eduard Kraft Gmbh Print head for ejecting a hot liquid medium and method for producing a joint comprising metallic solder
US6464324B1 (en) 2000-01-31 2002-10-15 Picojet, Inc. Microfluid device and ultrasonic bonding process
US20060050109A1 (en) * 2000-01-31 2006-03-09 Le Hue P Low bonding temperature and pressure ultrasonic bonding process for making a microfluid device
US7862678B2 (en) 2006-04-05 2011-01-04 Xerox Corporation Drop generator
EP2327115B1 (en) * 2008-09-23 2013-11-06 Hewlett-Packard Development Company, L.P. Removing piezoelectric material using electromagnetic radiation
US9139004B2 (en) * 2012-03-05 2015-09-22 Xerox Corporation Print head transducer dicing directly on diaphragm

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2164614A1 (en) * 1971-01-11 1972-08-10 Stemme N Arrangement of writing instruments for writing with colored liquid on paper
DE2256667C3 (en) * 1972-11-18 1975-04-30 Olympia Werke Ag, 2940 Wilhelmshaven Device for generating pressure pulses which are arranged in a base body
EP0145066A2 (en) * 1983-11-26 1985-06-19 Philips Patentverwaltung GmbH Microplanar ink jet print head
DE3412531A1 (en) * 1984-04-04 1985-10-17 Olympia Werke Ag, 2940 Wilhelmshaven Ink jet printing mechanism for multicolour printing on a recording medium
DE3608205A1 (en) * 1986-03-12 1987-09-17 Olympia Ag Piezoelectrically operated printhead for ink mosaic printers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3234408C2 (en) * 1982-09-16 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Write head with piezoelectric drive elements for ink writing devices
US4605939A (en) * 1985-08-30 1986-08-12 Pitney Bowes Inc. Ink jet array
US4641153A (en) * 1985-09-03 1987-02-03 Pitney Bowes Inc. Notched piezo-electric transducer for an ink jet device
US4668964A (en) * 1985-11-04 1987-05-26 Ricoh Company, Ltd. Stimulator for inkjet printer
US4751774A (en) * 1986-08-29 1988-06-21 Dataproducts Corporation Method of fabricating an ink jet apparatus
US4768266A (en) * 1986-08-29 1988-09-06 Dataproducts Corporation Method of making an ink jet printer transducer array

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2164614A1 (en) * 1971-01-11 1972-08-10 Stemme N Arrangement of writing instruments for writing with colored liquid on paper
DE2256667C3 (en) * 1972-11-18 1975-04-30 Olympia Werke Ag, 2940 Wilhelmshaven Device for generating pressure pulses which are arranged in a base body
EP0145066A2 (en) * 1983-11-26 1985-06-19 Philips Patentverwaltung GmbH Microplanar ink jet print head
DE3412531A1 (en) * 1984-04-04 1985-10-17 Olympia Werke Ag, 2940 Wilhelmshaven Ink jet printing mechanism for multicolour printing on a recording medium
DE3608205A1 (en) * 1986-03-12 1987-09-17 Olympia Ag Piezoelectrically operated printhead for ink mosaic printers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2713144A1 (en) * 1993-11-30 1995-06-09 Rohm Co Ltd Inkjet print head and printer.

Also Published As

Publication number Publication date
EP0327802A3 (en) 1990-01-31
US4897903A (en) 1990-02-06
DE3804165A1 (en) 1989-08-24
JPH024518A (en) 1990-01-09

Similar Documents

Publication Publication Date Title
DE69133469T2 (en) On-demand inkjet printhead
US5365645A (en) Methods of fabricating a page wide piezoelectric ink jet printhead assembly
EP0581395B1 (en) Ink jet printhead
EP0648607B1 (en) Ink-jet printhead module for a face shooter ink-jet printhead and method of manufacturing the same
DE3427850C2 (en)
DE69925318T2 (en) Ink jet recording head and ink jet recording apparatus containing the same
DE60315553T2 (en) Inkjet printhead
DE3202937C2 (en) Ink jet recording head
DE69908807T2 (en) DROPLETS RECORDER
DE60220846T2 (en) Continuous inkjet printhead
EP0327802A2 (en) Method for providing an ink jet print head with piezo crystals
DE69931001T2 (en) Piezoelectric vibrator, process for its manufacture and inkjet printhead using this piezoelectric vibrator
DE69824019T2 (en) DROPLET PRECIPITATION DEVICE
DE2256667C3 (en) Device for generating pressure pulses which are arranged in a base body
EP0268204A1 (en) Piezoelectric pump
DE3245283A1 (en) Arrangement for expelling liquid droplets
EP0691205A2 (en) Modular ink jet print head
EP0307403B1 (en) Ink writing head with piezoelectrically excitable membrane
DE3126351C2 (en) Device for forming a jet of droplets
DE4435914A1 (en) Piezoelectric drive for an ink jet print head and method for its production
EP0713775B1 (en) Arrangement for a modular ink jet print head
EP0671270B1 (en) Ink jet print head
EP0057956B1 (en) Writing head for an ink jet printer
DE602004008689T2 (en) INK JET HEAD AND METHOD FOR MANUFACTURING THEREOF
DE69822928T2 (en) Inkjet printhead

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): CH DE FR GB IT LI

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: AEG OLYMPIA OFFICE GMBH

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19900716

17Q First examination report despatched

Effective date: 19920408

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19920703