EP0062888B1 - Liquid droplets recording device - Google Patents

Liquid droplets recording device Download PDF

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Publication number
EP0062888B1
EP0062888B1 EP82102954A EP82102954A EP0062888B1 EP 0062888 B1 EP0062888 B1 EP 0062888B1 EP 82102954 A EP82102954 A EP 82102954A EP 82102954 A EP82102954 A EP 82102954A EP 0062888 B1 EP0062888 B1 EP 0062888B1
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EP
European Patent Office
Prior art keywords
transducers
printing device
tooth
nozzles
bilaminar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82102954A
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German (de)
French (fr)
Other versions
EP0062888A1 (en
Inventor
Jan Bolmgren
Kenth Dipl.-Ing. Nilsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Elema AB
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Siemens AG
Siemens Elema AB
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Publication of EP0062888A1 publication Critical patent/EP0062888A1/en
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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
    • B41J2/14282—Structure of print heads with piezoelectric elements of cantilever type
    • 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
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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
    • B41J2002/14387—Front shooter

Definitions

  • the invention relates to a writing device working with liquid droplets for the point-by-point recording of analog courses or alphanumeric characters as well as images, whereby there are nozzles arranged in rows for writing the individual points, from the inlet openings of which piezoelectric transducers contacted are arranged such that writing fluid occurs when the voltage changes at the contact ejected from the nozzle and applied to a recording medium arranged in front of the outlet opening of the nozzles that rod-shaped piezoelectric transducers are provided for generating the piezoelectric movements, the free end region of the transducers being individually assigned to an inlet opening of the nozzles and the transducers made of bilaminar material Piezoceramic and a carrier material are made.
  • Such a writing instrument is known from DE-A 25 27 647.
  • crosstalk between this and the adjacent tooth can occur due to hydraulic coupling by means of the writing fluid. This can lead to the neighboring tooth being set in motion and driving writing fluid out of the nozzle assigned to it.
  • each tooth In order to achieve good writing quality, each tooth must be in the rest position before it is actuated. If two adjacent teeth are to be actuated one after the other, the first actuated tooth should not cause the neighboring tooth to vibrate.
  • the time interval between the actuation pulses must be made so long that the vibration of the adjacent tooth has subsided.
  • the result is a sharp drop in the maximum write speed.
  • the vibration of the adjacent tooth can be effectively dampened by a high viscosity of the writing fluid, but at the same time the hydraulic coupling between the teeth is increased.
  • the vibration speed of a tooth is greatest at the tip. Therefore, the hydraulic coupling force between the teeth is greatest in the tip area of the teeth.
  • the distance between the teeth can be increased to reduce the hydraulic coupling. However, this lowers the writing quality because the distance between the nozzles increases.
  • the invention has for its object to provide a writing instrument of the type mentioned, in which the hydraulic coupling between the teeth is reduced so that crosstalk from an activated tooth to the adjacent teeth is largely avoided.
  • the viscosity of the liquid is denoted by t l .
  • the force is therefore proportional to the speed difference v and the area A.
  • the speed of an activated tooth is greatest in the free end area.
  • the coupling force between the teeth is therefore greatest in the end region of the tooth. Due to the fact that the transducers or the teeth in the end region are relatively thin according to the invention (area A is very small), the hydraulic coupling and thus also crosstalk between the teeth is largely avoided.
  • Another advantage is that the resonance frequency increases, which allows a higher writing speed.
  • the end region consists only of carrier material, e.g. B. metal, because the tooth can bump against the nozzle plate during its vibration. The end region or the metal tongue then takes up the blow; the more fragile piezoceramic is less stressed. In this way, the life of the writing instrument increases.
  • the ceramic part is removed at least over such a fraction of the transducer length which is between 1/2 and 1/5, preferably 1/3 of the transducer length.
  • the length of the metal tongue is chosen so that the resonance frequency of the end region is always above the resonance frequency of the entire tooth, including the tongue. In certain cases, e.g. B. if a liquid with a low viscosity is used, the resonance frequency of the end region (tongue) can be made lower than that of the bilaminar part.
  • the tongue then functions like a swing that can be set in motion by the bilaminar part.
  • the recording carrier 3 z. B. normal registration paper, drawn in the direction of arrow 4 over a spacer 5 on the side 6 of the housing 7.
  • the connecting line 8 is guided, which is provided at its free end with a plug 9 for connection to a control device, not shown, which supplies the control signals for recording the desired courses, characters or images.
  • the side 6 is the side of a carrier 10 which has a number of nozzles 11 arranged side by side in a row.
  • rod-shaped transducers 12 made of piezoelectric material are present in the housing, which are contacted and arranged in such a way that they spray writing fluid in the form of a droplet from the nozzle 11 with appropriate electrical control.
  • the piezo comb 14 consisting of the teeth 12 and the comb back 13 is arranged parallel to the plane of the carrier 10.
  • FIG. 3 shows that the comb-like piezo plate is bilaminar and is formed from a piezoceramic layer 16 and a metal layer 17.
  • the free end area of the individual teeth 12 is located in front of the individual nozzles 11 of the row of nozzles. In this area, the piezoceramic layer 16 is removed from the metal layer 17.
  • the piezoceramic layer 16 may be removed 12 by such a fraction of the tooth is between 1/2 and 1/5, preferably 1/3 of the tooth length.
  • the comb back 13 is screwed to the carrier 10 receiving the row of nozzles with a fastening screw set 15.
  • electrical voltage is applied to the contacts of a tooth 12, it moves into the position shown in dashed lines in FIG. 3. If the applied voltage is interrupted, it snaps back into the non-curved position drawn with solid lines and presses a droplet of writing fluid through the nozzle 11.
  • the length of the metal tongue of a tooth 12 must be chosen so that its resonance frequency is well above the resonance frequency of the entire tooth including the metal tongue. In certain cases, especially when writing fluid with a low viscosity is used, the resonance frequency of a relatively long metal tongue can be made low compared to the resonance frequency of the bilaminar part.
  • the tooth 12 then functions like a swing set in motion by the bilaminar part (Fig. 4). 4 shows that the metal layer can be ground in the end region of the tooth 12 after the ceramic layer has been removed. 5 shows that the bilaminar tooth 12 is ground to become thinner at its end. By keeping the end portion of the teeth as thin as possible, there is a maximum reduction in the hydraulic coupling between the teeth 12. Crosstalk from an activated tooth to the neighboring teeth is thus largely avoided, so that good writing quality and at the same time a high writing speed can be achieved.
  • ceramic or glass e.g. B. alumina may be provided.

Landscapes

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

Description

Die Erfindung betrifft ein mit Flüssigkeitströpfchen arbeitendes Schreibgerät zur punktweisen Aufzeichnung analoger Verläufe oder alphanumerischer Zeichen sowie von Bildern, wobei zum Schreiben der einzelnen Punkte reihenweise angeordnete Düsen vorhanden sind, von deren Eintrittsöffnungen derart kontaktierte piezoelektrische Wandler angeordnet sind, daß bei elektrischen Spannungsänderungen an der Kontaktierung Schreibflüssigkeit aus der Düse herausgestoßen und auf einen vor der Austrittsöffnung der Düsen angeordneten Aufzeichnungsträger aufgebracht wird, daß zur Erzeugung der piezoelektrischen Bewegungen stabförmige piezoelektrische Wandler vorgesehen sind, wobei der freie Endbereich der Wandler einzeln je einer Eintrittsöffnung der Düsen zugeordnet ist und die Wandler aus bilaminarem Material aus Piezokeramik und einem Trägermaterial gefertigt sind.The invention relates to a writing device working with liquid droplets for the point-by-point recording of analog courses or alphanumeric characters as well as images, whereby there are nozzles arranged in rows for writing the individual points, from the inlet openings of which piezoelectric transducers contacted are arranged such that writing fluid occurs when the voltage changes at the contact ejected from the nozzle and applied to a recording medium arranged in front of the outlet opening of the nozzles that rod-shaped piezoelectric transducers are provided for generating the piezoelectric movements, the free end region of the transducers being individually assigned to an inlet opening of the nozzles and the transducers made of bilaminar material Piezoceramic and a carrier material are made.

Ein solches Schreibgerät ist durch die DE-A 25 27 647 bekannt. Bei diesem Schreibgerät kann beim Aktivieren eines Wandlers bzw. Zahnes ein Übersprechen zwischen diesem und dem benachbarten Zahn aufgrund hydraulischer Kopplung mittels der Schreibflüssigkeit vorkommen. Dies kann dazu führen, daß der benachbarte Zahn in Bewegung gesetzt wird und Schreibflüssigkeit aus der ihm zugeordneten Düse heraustreibt.Such a writing instrument is known from DE-A 25 27 647. With this writing instrument, when a transducer or tooth is activated, crosstalk between this and the adjacent tooth can occur due to hydraulic coupling by means of the writing fluid. This can lead to the neighboring tooth being set in motion and driving writing fluid out of the nozzle assigned to it.

Um eine gute Schreibqualität zu erzielen, muß sich jeder Zahn vor seiner Betätigung in Ruhestellung befinden. Wenn zwei nebeneinanderliegende Zähne unmittelbar nacheinander betätigt werden sollen, so sollte der zuerst betätigte Zahn den benachbarten Zahn nicht in Schwingung versetzen.In order to achieve good writing quality, each tooth must be in the rest position before it is actuated. If two adjacent teeth are to be actuated one after the other, the first actuated tooth should not cause the neighboring tooth to vibrate.

Erfolgt dies doch, muß der Zeitabstand zwischen den Betätigungsimpulsen so lang gemacht werden, daß die Schwingung des benachbarten Zahnes abgeklungen ist. Das Ergebnis ist eine kräftige Senkung der maximalen Schreibgeschwindigkeit. Die Schwingung des benachbarten Zahnes kann zwar durch eine hohe Viskosität der Schreibflüssigkeit effektiv gedämpft werden, doch wird gleichzeitig die hydraulische Kopplung zwischen den Zähnen erhöht.If this does happen, the time interval between the actuation pulses must be made so long that the vibration of the adjacent tooth has subsided. The result is a sharp drop in the maximum write speed. The vibration of the adjacent tooth can be effectively dampened by a high viscosity of the writing fluid, but at the same time the hydraulic coupling between the teeth is increased.

Die Schwingungsgeschwindigkeit eines Zahnes ist an der Spitze am größten. Daher ist auch die hydraulische Kopplungskraft zwischen den Zähnen im Spitzenbereich der Zähne am größten. Um die hydraulische Kopplung zu verringern, kann der Abstand zwischen den Zähnen erhöht werden. Dies setzt jedoch die Schreibqualität herab, da der Abstand zwischen den Düsen größer wird.The vibration speed of a tooth is greatest at the tip. Therefore, the hydraulic coupling force between the teeth is greatest in the tip area of the teeth. The distance between the teeth can be increased to reduce the hydraulic coupling. However, this lowers the writing quality because the distance between the nozzles increases.

Der Erfindung liegt die Aufgabe zugrunde, ein Schreibgerät der eingangs genannten Art zu schaffen, bei dem die hydraulische Kopplung zwischen den Zähnen so verringert ist, daß ein Ubersprechen von einem aktivierten Zahn auf die benachbarten Zähne weitgehend vermieden ist.The invention has for its object to provide a writing instrument of the type mentioned, in which the hydraulic coupling between the teeth is reduced so that crosstalk from an activated tooth to the adjacent teeth is largely avoided.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß die Wandler im freien Endbereich derart dünner sind als im übrigen Bereich, daß die sich gegenüberliegenden Flächen in diesem Bereich verkleinert sind. Nach Newton's Gesetz gilt (für Newton'sche Flüssigkeiten) für die Kraft F zwischen zwei parallelen Ebenen mit den Flächen A, die im Abstand e zueinander mit einer Geschwindigkeit v verschoben werden

Figure imgb0001
This object is achieved in that the transducers in the free end area are thinner than in the rest of the area that the opposing surfaces are reduced in this area. According to Newton's law (for Newtonian fluids) the force F between two parallel planes with the areas A applies, which are shifted at a distance v from each other at a speed v
Figure imgb0001

Dabei ist mit tl die Viskosität der Flüssigkeit bezeichnet. Die Kraft ist somit proportional zu dem Geschwindigkeitsunterschied v und der Fläche A. Die Geschwindigkeit eines aktivierten Zahnes ist im freien Endbereich am größten. Die Kopplungskraft zwischen den Zähnen ist deshalb im Endbereich des Zahnes am größten. Dadurch, daß die Wandler bzw. die Zähne im Endbereich erfindungsgemäß verhältnismäßig dünn sind (Fläche A ist sehr klein), wird die hydraulische Kopplung und damit auch ein Übersprechen zwischen den Zähnen weitgehend vermieden. Ein weiterer Vorteil ist, daß die Resonanzfrequenz steigt, was eine höhere Schreibgeschwindigkeit erlaubt. Es ist ferner von Vorteil, daß der Endbereich lediglich aus Trägermaterial, z. B. Metall, besteht, da der Zahn bei seiner Schwingung gegen die Düsenplatte stoßen kann. Der Endbereich bzw. die Metallzunge nimmt dann den Schlag auf; die zerbrechlichere Piezokeramik wird weniger beansprucht. Auf diese Weise steigt die Lebensdauer des Schreibgerätes.The viscosity of the liquid is denoted by t l . The force is therefore proportional to the speed difference v and the area A. The speed of an activated tooth is greatest in the free end area. The coupling force between the teeth is therefore greatest in the end region of the tooth. Due to the fact that the transducers or the teeth in the end region are relatively thin according to the invention (area A is very small), the hydraulic coupling and thus also crosstalk between the teeth is largely avoided. Another advantage is that the resonance frequency increases, which allows a higher writing speed. It is also of advantage that the end region consists only of carrier material, e.g. B. metal, because the tooth can bump against the nozzle plate during its vibration. The end region or the metal tongue then takes up the blow; the more fragile piezoceramic is less stressed. In this way, the life of the writing instrument increases.

In einer vorteilhaften Weiterbildung der Erfindung wird vorgeschlagen, daß der Keramikteil wenigstens über einen solchen Bruchteil der Wandlerlänge entfernt ist, der zwischen 1/2 und 1 /5, vorzugsweise bei 1/3 der Wandlerlänge liegt. Die Länge der Metallzunge wird so gewählt, daß die Resonanzfrequenz des Endbereiches stets über der Resonanzfrequenz des ganzen Zahnes, die Zunge einbegriffen, liegt. In gewissen Fällen, z. B. wenn eine Flüssigkeit mit einer niedrigen Viskosität verwendet wird, kann die Resonanzfrequenz des Endbereiches (Zunge) niedriger gemacht werden als die des bilaminaren Teils. Die Zunge funktioniert dann wie eine Schaukel, die von dem bilaminaren Teil in Bewegung gesetzt werden kann.In an advantageous development of the invention it is suggested that the ceramic part is removed at least over such a fraction of the transducer length which is between 1/2 and 1/5, preferably 1/3 of the transducer length. The length of the metal tongue is chosen so that the resonance frequency of the end region is always above the resonance frequency of the entire tooth, including the tongue. In certain cases, e.g. B. if a liquid with a low viscosity is used, the resonance frequency of the end region (tongue) can be made lower than that of the bilaminar part. The tongue then functions like a swing that can be set in motion by the bilaminar part.

Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen.Further advantages and details of the invention emerge from the subclaims.

Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigt

  • Fig. 1 eine Draufsicht auf eine kammartige Piezoplatte mit Wandler nach der Erfindung,
  • Fig.2 eine schematische Ansicht eines Schreibgerätes,
  • Fig. 3 eine Seitenansicht eines als Biegeschwinger arbeitenden piezoelektrischen Wandlers, und
  • Fig. 4 und 5 verschiedene Ausführungsformen eines Wandlers nach der Erfindung.
The invention is explained below with reference to an embodiment shown in the drawing. It shows
  • 1 is a plan view of a comb-like piezo plate with a transducer according to the invention,
  • 2 shows a schematic view of a writing instrument,
  • Fig. 3 is a side view of a piezoelectric transducer working as a bending oscillator, and
  • 4 and 5 different embodiments of a converter according to the invention.

Aus Fig. 2 ist der äußere Prinzipaufbau eines bekannten Schreibgerätes ersichtlich. Über die Transportrollen 1 und 2 wird der Aufzeichnungsträger 3, z. B. normales Registrierpapier, in Richtung des Pfeiles 4 über einen Abstandshalter 5 an der Seite 6 des Gehäuses 7 vorbeigezogen. In das Gehäuse 7 ist die Anschlußleitung 8 geführt, die an ihrem freien Ende mit einem Stecker 9 zum Anschluß an ein nicht dargestelltes Steuergerät versehen ist, das die Steuersignale für die Aufzeichnung der gewünschten Verläufe, Zeichen oder Bilder liefert.2 shows the basic design of a known writing instrument. About the transport rollers 1 and 2, the record carrier 3, z. B. normal registration paper, drawn in the direction of arrow 4 over a spacer 5 on the side 6 of the housing 7. In the housing 7, the connecting line 8 is guided, which is provided at its free end with a plug 9 for connection to a control device, not shown, which supplies the control signals for recording the desired courses, characters or images.

In Fig. 1 und 3 ist dargestellt, wie die Seite 6 des Gehäuses parallel zum Aufzeichnungsträger 3 angebracht ist. Die Seite 6 ist die Seite eines Trägers 10, der eine Anzahl in einer Reihe nebeneinander angeordnete Düsen 11 aufweist. Außer der Schreibflüssigkeit sind im Gehäuse 7 stabförmige Wandler 12 aus piezoelektrischem Material vorhanden, die derart kontaktiert und angeordnet sind, daß sie bei entsprechender elektrischer Ansteuerung Schreibflüssigkeit in Form eines Tröpfchens aus der Düse 11 spritzen.1 and 3 show how the side 6 of the housing is attached parallel to the recording medium 3. The side 6 is the side of a carrier 10 which has a number of nozzles 11 arranged side by side in a row. In addition to the writing fluid, rod-shaped transducers 12 made of piezoelectric material are present in the housing, which are contacted and arranged in such a way that they spray writing fluid in the form of a droplet from the nozzle 11 with appropriate electrical control.

Die Zähne 12, die als Zähne eines Kammes ausgebildet sind (Fig. 1), arbeiten als Biegeschwinger. Dabei ist der aus den Zähnen 12 und dem Kammrücken 13 bestehende Piezokamm 14 parallel zur Ebene des Trägers 10 angeordnet. In der Fig. 3 ist dargestellt, daß die kammartige Piezoplatte bilaminar ist und aus einer Piezokeramik-Schicht 16 und einer Metallschicht 17 gebildet ist. Der freie Endbereich der einzelnen Zähne 12 befindet sich vor den einzelnen Düsen 11 der Düsenreihe. In diesem Bereich ist die Piezokeramik-Schicht 16 von der Metallschicht 17 entfernt. Die Piezokeramik-Schicht 16 kann über einen solchen Bruchteil des Zahnes 12 entfernt sein, der zwischen 1/2 und 1/5, vorzugsweise bei 1/3 der Zahnlänge liegt.The teeth 12, which are designed as teeth of a comb (FIG. 1), work as a bending oscillator. The piezo comb 14 consisting of the teeth 12 and the comb back 13 is arranged parallel to the plane of the carrier 10. FIG. 3 shows that the comb-like piezo plate is bilaminar and is formed from a piezoceramic layer 16 and a metal layer 17. The free end area of the individual teeth 12 is located in front of the individual nozzles 11 of the row of nozzles. In this area, the piezoceramic layer 16 is removed from the metal layer 17. The piezoceramic layer 16 may be removed 12 by such a fraction of the tooth is between 1/2 and 1/5, preferably 1/3 of the tooth length.

Der Kammrücken 13 ist mit einem Befestigungsschraubsatz 15 an dem die Düsenreihe aufnehmenden Träger 10 angeschraubt. Bei Anlegen von elektrischer Spannung an die Kontaktierungen eines Zahnes 12 bewegt sich dieser in die in Fig. 3 gestrichelt dargestellte Position. Bei einer Unterbrechung der angelegten Spannung schnellt er in die nicht gebogene, mit durchgezogenen Linien gezeichnete Stellung zurück und drückt dabei ein Tröpfchen Schreibflüssigkeit durch die Düse 11.The comb back 13 is screwed to the carrier 10 receiving the row of nozzles with a fastening screw set 15. When electrical voltage is applied to the contacts of a tooth 12, it moves into the position shown in dashed lines in FIG. 3. If the applied voltage is interrupted, it snaps back into the non-curved position drawn with solid lines and presses a droplet of writing fluid through the nozzle 11.

Die Länge der Metallzunge eines Zahnes 12 muß so gewählt werden, daß deren Resonanzfrequenz gut über der Resonanzfrequenz des ganzen Zahnes einschließlich der Metallzunge liegt. In gewissen Fällen, insbesondere wenn Schreibflüssigkeit mit einer niedrigen Viskosität verwendet wird, kann die Resonanzfrequenz einer verhältnismäßig langen Metallzunge im Vergleich zur Resonanzfrequenz des bilaminaren Teils niedrig gemacht werden. Der Zahn 12 funktioniert dann wie eine Schaukel, die von dem bilaminaren Teil in Bewegung gesetzt wird (Fig. 4). In der Fig. 4 ist dargestellt, daß die Metallschicht nach Entfernen der Keramikschicht im Endbereich des Zahnes 12 zugeschliffen sein kann. In der Fig. 5 ist gezeigt, daß der bilaminare Zahn 12 an seinem Ende dünner werdend zugeschliffen ist. Dadurch, daß der Endbereich der Zähne so dünn wie möglich gehalten wird, ist eine maximale Verringerung der hydraulischen Kopplung zwischen den Zähnen 12 gegeben. Ein Übersprechen von einem aktivierten Zahn auf die benachbarten Zähne wird somit weitgehend vermieden, so daß eine gute Schreibqualität und gleichzeitig eine hohe Schreibgeschwindigkeit erzielt werden kann.The length of the metal tongue of a tooth 12 must be chosen so that its resonance frequency is well above the resonance frequency of the entire tooth including the metal tongue. In certain cases, especially when writing fluid with a low viscosity is used, the resonance frequency of a relatively long metal tongue can be made low compared to the resonance frequency of the bilaminar part. The tooth 12 then functions like a swing set in motion by the bilaminar part (Fig. 4). 4 shows that the metal layer can be ground in the end region of the tooth 12 after the ceramic layer has been removed. 5 shows that the bilaminar tooth 12 is ground to become thinner at its end. By keeping the end portion of the teeth as thin as possible, there is a maximum reduction in the hydraulic coupling between the teeth 12. Crosstalk from an activated tooth to the neighboring teeth is thus largely avoided, so that good writing quality and at the same time a high writing speed can be achieved.

Als Trägermaterial für die Piezokeramik kann statt Metall auch Keramik oder Glas, z. B. Aluminiumoxid, vorgesehen sein.As a carrier material for the piezoceramic, ceramic or glass, e.g. B. alumina may be provided.

Claims (4)

1. A printing device, operating using ink droplets, for the punctiform recording of analogue progresses or alphanumeric characters, as well as images, wherein, in order to print the individual dots, nozzles are provided which are arranged in rows and in front of the inlet openings of which piezoelectric transducers are arranged which are contacted in such a way that in the event of changes in electric voltage at the contact, printing fluid is ejected from the nozzle and applied to a data carrier which is arranged in front of the outlet opening of the nozzle; and that rod-shaped piezoelectric transducers are provided for the production of the piezoelectric movements, the free end region of the transducers being individually assigned to an inlet opening of the nozzles, and the transducers being manufactured from a bilaminar material made of piezoceramic and a carrier material, characterised in that in the free end region, the transducers are thinner than in the remaining region to an extent such that the surfaces, which lie opposite to one another are reduced in this region.
2. A printing device as claimed in Claim 1, characterised in that the ceramic part (16) is removed at least over a fraction of the transducer length which lies between 1/2 and 1/5, preferably 1/3 of the transducer length.
3. A printing device as claimed in one of Claims 1 or 2, characterised in that the bilaminar transducer (12) is ground so as to become thinner at its end.
4. A printing device as claimed in one of Claims 1 to 3, characterised in that, after the partial removal of the ceramic part (16), the carrier material (17) is ground.
EP82102954A 1981-04-08 1982-04-06 Liquid droplets recording device Expired EP0062888B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813114224 DE3114224A1 (en) 1981-04-08 1981-04-08 WRITING DEVICE WORKING WITH LIQUID DROPS
DE3114224 1981-04-08

Publications (2)

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EP0062888A1 EP0062888A1 (en) 1982-10-20
EP0062888B1 true EP0062888B1 (en) 1985-02-13

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EP82102954A Expired EP0062888B1 (en) 1981-04-08 1982-04-06 Liquid droplets recording device

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US (1) US4438441A (en)
EP (1) EP0062888B1 (en)
JP (1) JPS57178769A (en)
BR (1) BR8202039A (en)
DE (2) DE3114224A1 (en)

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Publication number Priority date Publication date Assignee Title
DE3306101A1 (en) * 1983-02-22 1984-08-23 Siemens AG, 1000 Berlin und 8000 München WRITING DEVICE WORKING WITH LIQUID DROPS
DE3317082A1 (en) * 1983-05-10 1984-11-15 Siemens AG, 1000 Berlin und 8000 München WRITING DEVICE WORKING WITH LIQUID DROPS
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JPS57178769A (en) 1982-11-04
EP0062888A1 (en) 1982-10-20
BR8202039A (en) 1983-03-22
US4438441A (en) 1984-03-20
DE3262280D1 (en) 1985-03-28
JPH0231667B2 (en) 1990-07-16
DE3114224A1 (en) 1982-11-04

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