EP0013918A1 - Switching circuit for the temperature-dependent voltage regulation of piezoelectric printing nozzles in mosaic ink jet printers - Google Patents

Switching circuit for the temperature-dependent voltage regulation of piezoelectric printing nozzles in mosaic ink jet printers Download PDF

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Publication number
EP0013918A1
EP0013918A1 EP80100141A EP80100141A EP0013918A1 EP 0013918 A1 EP0013918 A1 EP 0013918A1 EP 80100141 A EP80100141 A EP 80100141A EP 80100141 A EP80100141 A EP 80100141A EP 0013918 A1 EP0013918 A1 EP 0013918A1
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EP
European Patent Office
Prior art keywords
voltage
circuit
control
temperature
writing
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Granted
Application number
EP80100141A
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German (de)
French (fr)
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EP0013918B1 (en
Inventor
Hans Dipl.-Ing. Kern
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Siemens AG
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Siemens AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04541—Specific driving circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04553—Control methods or devices therefor, e.g. driver circuits, control circuits detecting ambient temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/072—Ink jet characterised by jet control by thermal compensation
    • 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
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control
    • B41J2/365—Print density control by compensation for variation in temperature

Definitions

  • the invention relates to a circuit arrangement for temperature-dependent voltage regulation of the control voltages required for the operation of piezoelectric writing nozzles in ink mosaic writing devices with a control circuit assigned to each writing nozzle, in which a voltage converter circuit is provided, the secondary-side inductance of which forms an oscillating circuit together with the capacitance of the writing nozzle and which furthermore is a device for Control voltage setting contains.
  • Ink nozzles that use the piezoelectric principle are used in ink mosaic writing devices.
  • tubular, liquid-containing drive elements made of polarized ceramic are used, the diameter of which changes when an electrical one is applied Voltage narrows in the direction of the polarization voltage, expanded against the polarity voltage when an electrical voltage is applied.
  • a circuit arrangement for generating the voltages required to control the writing nozzles (DE-OS 25 48 691), with which the writing nozzles in the idle state are expanded by applying a voltage opposing the polarity voltage, and this extended state is maintained for a defined time, and in that to eject the ink droplet, the writing nozzle is brought from an expanded to a narrowed state by changing the polarity of a control voltage that causes the expanded state.
  • the known circuit arrangement contains a voltage converter circuit whose inductance on the secondary side, in conjunction with the capacitance of the writing nozzle, forms an oscillating circuit damped by an attenuator.
  • a device for adjusting the control voltage is provided, with which the primary current in the voltage converter circuit can be limited.
  • This known control of the writing nozzles has the advantage that a very large stroke can be generated with relatively small changes in voltage on the ceramic tube of the writing nozzle.
  • the control voltage for the writing nozzles can be set individually for each writing nozzle, which is particularly advantageous for ink mosaic writing devices in which the writing head contains several writing nozzles. In this case, a separate control circuit is provided for each writing nozzle.
  • the mode of operation of the writing nozzles necessary for normal and trouble-free operation depends not only on the supply with a very specific, individually adjustable control voltage; of equally great importance
  • Another aspect is the dependence on the viscosity of the writing fluid.
  • the viscosity of the ink used as a writing fluid is now largely temperature-dependent. It changes even with slight changes in the ambient temperature.
  • the object of the invention is to provide a control device with which the voltage values for the individual writing nozzles set at a predetermined temperature can be changed jointly depending on the temperature change.
  • control circuits provided for generating the control voltages required for the individual writing nozzles can be changed only very slightly, while maintaining the principle of their mode of operation, in particular the possibility of individually adjusting the control voltages required for the individual writing nozzles and that a change in the control voltages due to temperature changes covers all control circuits together.
  • each of the, for example, 12 writing nozzles 1 is assigned a control circuit 2, via which each writing nozzle is supplied with the control voltage required for it.
  • the structure of a control circuit 2 is known per se.
  • the pulses present at a pulse input 3 pass through a driver stage 4 for adaptation to the voltage conditions of the circuit arrangement to an amplifier stage 5, which is constructed from integrated transistors in a Darlington circuit.
  • the amplifier stage 5 is followed by the primary winding of a voltage converter circuit 6, via which the writing nozzle 1 is decoupled from the amplifier stage 5.
  • the secondary inductance of the voltage converter circuit 6 forms, together with the capacitance of the writing nozzle 1, an oscillating circuit which is damped on one side by the series connection of a resistor 7 with a diode 8.
  • the voltage supply to the control circuit 2 takes place via the connections 9 and 10 common power supply.
  • the operation of the control circuit 2 is as follows. A pulse arriving at the pulse input 3 makes the amplifier stage 5 conductive, so that the primary winding of the voltage converter circuit 6 is traversed by the current, which induces a voltage surge in the secondary winding. As a result, the resonant circuit formed from the secondary inductance of the voltage converter circuit 6 and the capacitance of the writing nozzle 1 is triggered. If the current is switched off at the end of the pulse, a voltage is induced in the opposite direction.
  • the control circuit contains a device for adjusting the base voltage for the amplifier stage 5. This is done by a voltage divider circuit consisting of resistors 11 and 12 and a limiter diode 13. At the dividing point of the voltage divider. circuit so that the base voltage for the amplifier circuit 5 can be set such that a current limitation in the voltage converter circuit 6 comes about in connection with the emitter resistor 14, whereby a simple adaptation to the individual voltage requirement of the writing nozzle 1 is possible.
  • the adjustable resistors of the voltage divider are each connected to a constant voltage.
  • the controllable resistors 12 of the voltage dividers of all the control circuits 2 are connected together to the output 15 of a control circuit 16, which supplies an output voltage which is dependent on the ambient temperature
  • Control circuit 16 contains a temperature-dependent resistor 20, which is preferably a thermistor, and, as a control device, an operational amplifier 24 with a downstream transistor 25.
  • the non-inverting input of operational amplifier 24 is connected to a first voltage divider 17, 18, 19, which also contains the temperature-dependent resistor 20 contains.
  • the inverting input of the operational amplifier 24 is connected to a second voltage divider 21, 22.
  • negative feedback is provided via an adjustable resistor 26 bridged by a diode 27.
  • the control device 24 and 25 is set such that at room temperature at the output 15 of the control circuit 16 a sufficient voltage for operating the writing nozzles is emitted.
  • the individual target voltages for the individual writing nozzles 1 are then set via the adjustable resistors 12.
  • the resistance value of the temperature-dependent resistor 20 and thus the output voltage of the control circuit 16 also change. This is available via the controllable resistors 12, the inputs of the control circuits 2 connected in parallel and leads to the control voltages for the individual writing nozzles 1 being proportional be changed to change the output voltage at output 15.
  • the adjustable resistor 26 is provided in the negative feedback branch of the control device 24 and 25.
  • the voltage present at the non-inverting input of the operational amplifier 24 is adjusted via the adjustable resistor 18 of the first voltage divider in such a way that the voltage at the inverting input of the operational amplifier 24 corresponds to the output voltage at output 15 at room temperature.
  • the adjustable resistor 26 arranged in the negative feedback branch is bridged by a diode 27 which becomes conductive at high temperatures and thus at a low control voltage and amplifies the negative feedback. This reduces the control steepness at high temperatures and the control steepness set via the adjustable resistor 26 is only fully effective at low temperatures.

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

Abstract

Die Erfindung betrifft eine Schaltungsanordnung zur temperaturabhängigen Spannungsregeiung für piezoelektrische Schreibdüsen in Tintenmosaikschreibeinrichtungen. Zur temperaturabhängigen Spannungsversorgung der über Steuerschaltungen mit einer einstellbaren Spannung betreibbaren peizoelektrischen Schreibdüsen in Tintenmosaikschreibeinrichtungen ist eine für alle Steuerschaltungen gemeinsame Regelschaltung (16) zur Erzeugung einer temperaturabhängigen Ausgangsspannung vorgesehen, an derem Ausgang die einzelnen Steuerschaltungen (2) parallel angeschaltet sind; die individuelle Einteilung der Betriebsspannung erfolgt über den Steuerschaltungen vorgeschalteten einstellbaren Widerständen (12). Die Erfindung findet bei Tintenmosaikschreibeinichtungen Anwendung.The invention relates to a circuit arrangement for temperature-dependent voltage regulation for piezoelectric writing nozzles in ink mosaic writing devices. For temperature-dependent voltage supply to the peizoelectric writing nozzles in ink mosaic writing devices, which can be operated via control circuits with an adjustable voltage, a control circuit (16) common to all control circuits is provided for generating a temperature-dependent output voltage, at the output of which the individual control circuits (2) are connected in parallel; The individual division of the operating voltage takes place via the adjustable resistors (12) connected upstream of the control circuits. The invention finds application in ink mosaic writing devices.

Description

Die Erfindung betrifft eine Schaltungsanordnung zur temperaturabhängigen Spannungsregelung der zum Betrieb von piezoelektrischen Schreibdüsen erforderlichen Steuerspannungen in Tintenmosaikschreibeinrichtungen mit einer jeder Schreibdüse zugeordneten Steüerschaltung, in der eine Spannungswandlerschaltung vorgesehen ist, deren sekundärseitige Induktivität zusammen mit der Kapazität der Schreibdüse einen Schwingkreis bildet und die weiterhin eine Einrichtung zur Einstellung der Steuerspannung enthält.The invention relates to a circuit arrangement for temperature-dependent voltage regulation of the control voltages required for the operation of piezoelectric writing nozzles in ink mosaic writing devices with a control circuit assigned to each writing nozzle, in which a voltage converter circuit is provided, the secondary-side inductance of which forms an oscillating circuit together with the capacitance of the writing nozzle and which furthermore is a device for Control voltage setting contains.

In Tintenmosaikschreibeinrichtungen finden Schreibdüsen Verwendung, die nach dem piezoelektrischen Prinzip arbeiten. Dazu werden röhrenförmige, Schreibflüssigkeit enthaltende Antriebselemente aus polarisierter Keramik verwendet, deren Durchmesser sich bei Anlegen einer elektrischen Spannung in Richtung der Polarisationsspannung verengt, bei Anlegen einer elektrischen Spannung entgegen der Polaritätsspannung erweitert.Ink nozzles that use the piezoelectric principle are used in ink mosaic writing devices. For this purpose, tubular, liquid-containing drive elements made of polarized ceramic are used, the diameter of which changes when an electrical one is applied Voltage narrows in the direction of the polarization voltage, expanded against the polarity voltage when an electrical voltage is applied.

Zur Erzeugung der zur Steuerung der Schreibdüsen erforderlichen Spannungen ist eine Schaltungsanordnung bekannt (DE-OS 25 48 691), mit der die im Ruhezustand befindlichen Schreibdüsen durch Anlegen einer der Polaritätsspannung entgegengerichteten Spannung erweitert, und dieser erweiterte Zustand eine definierte Zeit aufrechterhalten wird, und daß zum Ausstößen des Tintentröpfchens die Schreibdüse aus einem erweiterten in einen verengten Zustand durch Polaritätswechsel einer, den erweiterten Zustand hervorrufenden Steuerspannung gebracht wird. Die bekannte Schaltungsanordnung enthält dazu eine Spannungswandlerschaltung, deren sekundärseitige Induktivität in Verbindung mit der Kapazität der Schreibdüse einen über ein Dämpfungsglied gedämpften Schwingkreis bildet. Zur Einstellung der Höhe der an den Schreibdüsen anliegenden Steuerspannung ist eine Einrichtung zur Einstellung der Steuerspannung vorgesehen, mit der der Primärstrom in der Spannungswandlerschaltung begrenzbar ist. Diese bekannte Ansteuerung der Schreibdüsen hat den Vorteil, daß damit ein sehr großer Hub bei relativ kleinen Spannungsänderungen am Keramikröhrchen der Schreibdüse erzeugt werden kann. Weiterhin kann die Steuerspannung für die Schreibdüsen individuell für jede Schreibdüse eingestellt werden,.was insbesondere für Tintenmosaikschreibeinrichtungen von Vorteil ist, bei denen der Schreibkopf jeweils mehrere Schreibdüsen enthält. In diesem Falle ist für jede Schreibdüse eine eigene Steuerschaltung vorgesehen.A circuit arrangement is known for generating the voltages required to control the writing nozzles (DE-OS 25 48 691), with which the writing nozzles in the idle state are expanded by applying a voltage opposing the polarity voltage, and this extended state is maintained for a defined time, and in that to eject the ink droplet, the writing nozzle is brought from an expanded to a narrowed state by changing the polarity of a control voltage that causes the expanded state. For this purpose, the known circuit arrangement contains a voltage converter circuit whose inductance on the secondary side, in conjunction with the capacitance of the writing nozzle, forms an oscillating circuit damped by an attenuator. To adjust the level of the control voltage applied to the writing nozzles, a device for adjusting the control voltage is provided, with which the primary current in the voltage converter circuit can be limited. This known control of the writing nozzles has the advantage that a very large stroke can be generated with relatively small changes in voltage on the ceramic tube of the writing nozzle. Furthermore, the control voltage for the writing nozzles can be set individually for each writing nozzle, which is particularly advantageous for ink mosaic writing devices in which the writing head contains several writing nozzles. In this case, a separate control circuit is provided for each writing nozzle.

Die für einen normalen und störungsfreien Betrieb notwendige Arbeitsweise der Schreibdüsen hängt jedoch nicht nur von der Versorgung mit einer ganz bestimmten individuell einstellbaren Steuerspannung ab; von ebenso großer Bedeutung ist daneben auch die Abhängigkeit von der Viskosität der Schreibflüssigkeit. Die Viskosität der als Schreibflüssigkeit verwendeten Tinte ist nun aber in starkem Maße temperaturabhängig. Sie ändert sich bereits bei geringen Änderungen der Umgebungstemperatur.However, the mode of operation of the writing nozzles necessary for normal and trouble-free operation depends not only on the supply with a very specific, individually adjustable control voltage; of equally great importance Another aspect is the dependence on the viscosity of the writing fluid. However, the viscosity of the ink used as a writing fluid is now largely temperature-dependent. It changes even with slight changes in the ambient temperature.

Für Tintenstrahlschreiber, bei dem Tinte unter statischen Druck einer Düse zugeführt und von dieser in Form von Tintentröpfchen kontinuierlich ausgestoßen und dann unter Wirkung eines zwischen der Düse und Elektroden mit Hilfe eines Hochspannungsgenerators erzeugten elektrostatischen Feldes beschleunigt wird, ist deshalb bereits angegeben worden, mit Hilfe eines Temperaturfühlers die Tintentemperatur zu erfassen und in Abhängigkeit davon die Ausgangsspannung des Hochspannungsgenerators zu verändern (DE-AS 23 53 525). Diese Anordnung ist jedoch für Tintenmosaikschreibeinrichtungen mit nach dem piezoelektrischen Prinzip arbeitenden Schreibdüsen nicht geeignet. Insbesondere in Vorrichtungen, in denen jede einzelne Düse des Schreibkopfes mit einer individuellen Steuerspannung versorgt werden muß, und in denen die Steuerschaltungen zur Erzeugung der individuell einstellbaren Steuerspannungen den einzelnen Schreibdüsen jeweils zugeordnet sind, muß der Einsatz dieser bekannten Anordnung ausscheiden.For ink jet recorders, in which ink is supplied to a nozzle under static pressure and continuously ejected from it in the form of ink droplets and then accelerated under the action of an electrostatic field generated between the nozzle and electrodes with the aid of a high-voltage generator, it has therefore already been stated using a Temperature sensor to detect the ink temperature and to change the output voltage of the high voltage generator depending on it (DE-AS 23 53 525). However, this arrangement is not suitable for ink mosaic writing devices with writing nozzles operating according to the piezoelectric principle. In particular in devices in which each individual nozzle of the write head has to be supplied with an individual control voltage, and in which the control circuits for generating the individually adjustable control voltages are assigned to the individual write nozzles, the use of this known arrangement must be eliminated.

Aufgabe der Erfindung ist es,.eine Regeleinrichtung zu schaffen, mit der die bei einer vorgegebenen Temperatur eingestellten Spannungswerte für die einzelnen Schreibdüsen abhängig von der Temperaturänderung gemeinsam geändert werden können.The object of the invention is to provide a control device with which the voltage values for the individual writing nozzles set at a predetermined temperature can be changed jointly depending on the temperature change.

Gelöst wird diese Aufgabe durch die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale.This object is achieved by the features specified in the characterizing part of patent claim 1.

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

Es.ist ein wesentlicher Vorteil der Erfindung, daß die zur Erzeugung der für die einzelnen Schreibdüsen notwendigen Steuerspannungen vorgesehenen Steuerschaltungen nur ganz geringfügig zu ändern sind, wobei jedoch das Prinzip ihrer Wirkungsweise, insbesondere die Möglichkeit der individuellen Einstellung der für die einzelnen Schreibdüsen erforderlichen Steuerspannungen beibehalten werden kann, und daß eine durch Temperaturänderungen bedingte Änderung der Steuerspannungen alle Steuerschaltungen gemeinsam erfaßt.It is an essential advantage of the invention that the control circuits provided for generating the control voltages required for the individual writing nozzles can be changed only very slightly, while maintaining the principle of their mode of operation, in particular the possibility of individually adjusting the control voltages required for the individual writing nozzles and that a change in the control voltages due to temperature changes covers all control circuits together.

Weitere Einzelheiten der Erfindung werden im folgenden anhand eines in der Zeichnung dargestellten Ausführungsbeispieles erläutert.Further details of the invention are explained below with reference to an embodiment shown in the drawing.

Dort ist jeder der beispielsweise 12 Schreibdüsen 1 eine Steuerschaltung 2 zugeordnet, über die jede Schreibdüse mit der für sie erforderlichen Steuerspannung versorgt wird. Der Aufbau einer Steuerschaltung 2 ist an sich bekannt. Die an einem Impulseingang 3 anliegenden Impulse gelangen über eine Treiberstufe 4 zur Anpassung an die Spannungsverhältnisse der Schaltungsanordnung an eine Verstärkerstufe 5, die aus integrierten Transistoren in Darlington-Schaltung aufgebaut ist. Der Verstärkerstufe 5 ist die Primärwicklung einer Spannungswandlerschaltung 6 nachgeschaltet, über die die Schreibdüse 1 von der Verstärkerstufe 5 entkoppelt wird. Die Sekundärinduktivität der Spannungswandlerschaltung 6 bildet zusammen mit der Kapazität der Schreibdüse 1 einen Schwingkreis, der einseitig durch die Serienschaltung eines Widerstandes 7 mit einer Diode 8 bedämpft ist. Die Spannungsversorgung der Steuerschaltung 2 geschieht über die Anschlüsse 9 und 10 einer gemeinsamen Spannungsversorgung. Die Arbeitsweise der Steuerschaltung 2 ist folgende. Durch einen über den Impulseingang 3 eintreffenden Impuls wird die Verstärkerstufe 5 leitend, so daß die Primärwicklung der Spannungswandlerschaltung 6 vom Strom durchflossen wird, der in der Sekundärwicklung einen SpannungsstoB induziert. Dadurch wird der aus der Sekundärinduktivität der Spannungswandlerschaltung 6 und der Kapazität der Schreibdüse 1 gebildete Schwingkreis angestoßen. Wird am Ende des Impulses der Strom abgeschaltet, so wird eine Spannung in entgegengesetzter Richtung induziert. Durch eine .geeignete Dimensionierung der Dämpfungsmittel 7 und 8 und durch eine Anpassung der Induktivität der Sekundärwicklung der Spannungswandlerschaltung 6 an die Kapazität der Schreibdüse 1 kann ein optimaler Spannungsverlauf für den Betrieb der Schreibdüse erreicht werden. Zur Einstellung der zum Betrieb notwendigen Spannungen für die einzelnen Schreibdüsen 1 enthält die Steuerschaltung eine Einrichtung zur Einstellung der Basisspannung für die Verstärkerstufe 5. Dazu dient eine Spannungsteilerschaltung, die aus den Widerständen 11 und 12 besteht und eine Begrenzerdiode 13. Am Teilerpunkt der Spannungsteiler- . schaltung kann damit die Basisspannung für die Verstärkerschaltung 5 derart eingestellt werden, daß in Verbindung mit dem Emitterwiderstand 14 eine Strombegrenzung in der Spannungswandlerschaltung 6 zustande kommt, wodurch eine einfache Anpassung an den individuellen Spannungsbedarf der Schreibdüse 1 möglich ist. In der bekannten Steuerschaltung sind die regelbaren Widerstände des Spannungsteilers jeweils an eine konstante Spannung angeschaltet. Bei der erfindungsgemäßen Anordnung dagegen sind die regelbaren Widerstände 12 der Spannungsteiler aller Steuerschaltungen 2 gemeinsam an den Ausgang 15 einer Regelschaltung 16 angeschlossen, die eine von der Umgebungstemperatur abhängige Ausgangsspannung lieferte Die Regelschaltung 16 enthält einen temperaturabhängigen Widerstand 20, der vorzugsweise ein Heißleiter ist, und als Regeleinrichtung einen Operationsverstärker 24 mit einem nachgeschalteten Transistor 25. Der nicht invertierende Eingang des Operationsverstärkers 24 ist an einen ersten Spannungsteiler 17, 18, 19 angeschlossen, der auch den temperaturabhängigen Widerstand 20 enthält. Der invertierende Eingang des Operationsverstärkers 24 ist an einen zweiten Spannungsteiler 21, 22 angeschlossen. Weiterhin ist eine Gegenkopplung über einen durch eine Diode 27 überbrückten einstellbaren Widerstand 26 vorgesehen.There, each of the, for example, 12 writing nozzles 1 is assigned a control circuit 2, via which each writing nozzle is supplied with the control voltage required for it. The structure of a control circuit 2 is known per se. The pulses present at a pulse input 3 pass through a driver stage 4 for adaptation to the voltage conditions of the circuit arrangement to an amplifier stage 5, which is constructed from integrated transistors in a Darlington circuit. The amplifier stage 5 is followed by the primary winding of a voltage converter circuit 6, via which the writing nozzle 1 is decoupled from the amplifier stage 5. The secondary inductance of the voltage converter circuit 6 forms, together with the capacitance of the writing nozzle 1, an oscillating circuit which is damped on one side by the series connection of a resistor 7 with a diode 8. The voltage supply to the control circuit 2 takes place via the connections 9 and 10 common power supply. The operation of the control circuit 2 is as follows. A pulse arriving at the pulse input 3 makes the amplifier stage 5 conductive, so that the primary winding of the voltage converter circuit 6 is traversed by the current, which induces a voltage surge in the secondary winding. As a result, the resonant circuit formed from the secondary inductance of the voltage converter circuit 6 and the capacitance of the writing nozzle 1 is triggered. If the current is switched off at the end of the pulse, a voltage is induced in the opposite direction. By a suitable dimensioning of the damping means 7 and 8 and by adapting the inductance of the secondary winding of the voltage converter circuit 6 to the capacitance of the writing nozzle 1, an optimal voltage curve for the operation of the writing nozzle can be achieved. To set the voltages necessary for operation of the individual writing nozzles 1, the control circuit contains a device for adjusting the base voltage for the amplifier stage 5. This is done by a voltage divider circuit consisting of resistors 11 and 12 and a limiter diode 13. At the dividing point of the voltage divider. circuit so that the base voltage for the amplifier circuit 5 can be set such that a current limitation in the voltage converter circuit 6 comes about in connection with the emitter resistor 14, whereby a simple adaptation to the individual voltage requirement of the writing nozzle 1 is possible. In the known control circuit, the adjustable resistors of the voltage divider are each connected to a constant voltage. In the arrangement according to the invention, on the other hand, the controllable resistors 12 of the voltage dividers of all the control circuits 2 are connected together to the output 15 of a control circuit 16, which supplies an output voltage which is dependent on the ambient temperature Control circuit 16 contains a temperature-dependent resistor 20, which is preferably a thermistor, and, as a control device, an operational amplifier 24 with a downstream transistor 25. The non-inverting input of operational amplifier 24 is connected to a first voltage divider 17, 18, 19, which also contains the temperature-dependent resistor 20 contains. The inverting input of the operational amplifier 24 is connected to a second voltage divider 21, 22. Furthermore, negative feedback is provided via an adjustable resistor 26 bridged by a diode 27.

Die Wirkungsweise der erfindungsgemäßen Anordnung ist dabei folgende.The operation of the arrangement according to the invention is as follows.

Mit Hilfe des im ersten Spannungsteiler enthaltenen einstellbaren Widerstandes 18, der beispielsweise ein Potentiometer sein kann, wird die Regeleinrichtung 24 und 25 derart eingestellt, daß bei Raumtemperatur am Ausgang 15 der Regelschaltung 16 eine zum Betrieb der Schreibdüsen ausreichende Spannung abgegeben wird. Über die regelbaren Widerstände 12 werden dann die individuellen Sollspannungen für die einzelnen Schreibdüsen 1 eingestellt. Mit Änderung der Umgebungstemperatur ändert sich auch der Widerstandswert des temperaturabhängigen Widerstandes 20 und damit die Ausgangsspannung der Regelschaltung 16. Diese steht über die regelbaren Widerstände 12, den parallelgeschalteten Eingängen der Steuerschaltungen 2 zur Verfügung und führt dazu, daß die Steuerspannungen für die einzelnen Schreibdüsen 1 proportional zu der Änderung der Ausgangsspannung am Ausgang 15 geändert werden.With the help of the adjustable resistor 18 contained in the first voltage divider, which can be, for example, a potentiometer, the control device 24 and 25 is set such that at room temperature at the output 15 of the control circuit 16 a sufficient voltage for operating the writing nozzles is emitted. The individual target voltages for the individual writing nozzles 1 are then set via the adjustable resistors 12. As the ambient temperature changes, the resistance value of the temperature-dependent resistor 20 and thus the output voltage of the control circuit 16 also change. This is available via the controllable resistors 12, the inputs of the control circuits 2 connected in parallel and leads to the control voltages for the individual writing nozzles 1 being proportional be changed to change the output voltage at output 15.

Zur Einstellung der Regelsteilheit ist im Gegenkopplungszweig der Regeleinrichtung 24 und 25 der einstellbare Widerstand 26 vorgesehen. Um zu vermeiden, daß eine möglicherweise notwendige Korrektur der Steilheit einen Einfluß auf die Ausgangsspannung bei Raumtemperatur hat, wird die am nicht invertierenden Eingang des Operationsverstärkers 24 anliegende Spannung über den regelbaren Widerstand 18 des ersten Spannungsteilers derart eingestellt, daß die Spannung am invertierenden Eingang des Operationsverstärkers 24 der Ausgangsspannung am Ausgang 15 bei Raumtemperatur entspricht.To set the control steepness, the adjustable resistor 26 is provided in the negative feedback branch of the control device 24 and 25. In order to avoid that a possibly necessary correction of the slope has an influence on the output voltage at room temperature, the voltage present at the non-inverting input of the operational amplifier 24 is adjusted via the adjustable resistor 18 of the first voltage divider in such a way that the voltage at the inverting input of the operational amplifier 24 corresponds to the output voltage at output 15 at room temperature.

Um zu vermeiden, daß die Regelspannung bei hohen Temperaturen nicht zu stark abfällt, ist der im Gegenkopplungszweig angeordnete regelbare Widerstand 26 durch eine Diode 27 überbrückt, die bei hohen Temperaturen und damit bei einer kleinen Regelspannung leitend wird und die Gegenkopplung verstärkt. Damit wird die Regelsteilheit bei hohen Temperaturen verkleinert und die über den regelbaren Widerstand 26 eingestellte Regelsteilheit wird nur bei tiefen Temperaturen voll wirksam.In order to avoid that the control voltage does not drop too much at high temperatures, the adjustable resistor 26 arranged in the negative feedback branch is bridged by a diode 27 which becomes conductive at high temperatures and thus at a low control voltage and amplifies the negative feedback. This reduces the control steepness at high temperatures and the control steepness set via the adjustable resistor 26 is only fully effective at low temperatures.

5 Patentansprüche5 claims

1 Figur1 figure

Claims (5)

1. Schaltungsanordnung zur temperaturabhängigen Spannungsregelung der zum Betrieb von piezoelektrischen Schreibdüsen erforderlichen Steuerspannungen in Tintenmosaikschreibeinrichtungen mit einer jeder Schreibdüse zugeordneten Steuerschaltung, in der eine Spannungswandlerschaltung vorgesehen ist, deren sekundärseitige Induktivität zusammen mit der Kapazität der Schreibdüse einen Schwingkreis bildet, und die weiterhin eine Einrichtung zur Einstellung der Steuerspannung enthält, dadurch gekennzeichnet, daß der zur Einstellung der Steuerspannung in jeder Steuerschaltung (2) vorgesehene Spannungsteiler (11, 12) einen einstellbaren Widerstand (12) enthält, der mit einer für alle Steuerschaltungen (2) gemeinsamen Regelschaltung (16) verbunden ist, und daß die Regelschaltung (16) eine über einen temperaturabhängigen Widerstand (20) steuerbare Regeleinrichtung (24, 25, 26, 27) enthält, und an ihrem Ausgang (15) eine sich mit der Umgebungstemperatur ändernde Ausgangsspannung abgibt.1. Circuit arrangement for temperature-dependent voltage regulation of the control voltages required for the operation of piezoelectric writing nozzles in ink mosaic writing devices with a control circuit assigned to each writing nozzle, in which a voltage converter circuit is provided, the secondary-side inductance of which forms an oscillating circuit together with the capacitance of the writing nozzle, and which furthermore provides a device for setting of the control voltage, characterized in that the voltage divider (11, 12) provided for setting the control voltage in each control circuit (2) contains an adjustable resistor (12) which is connected to a control circuit (16) common to all control circuits (2) , and that the control circuit (16) contains a control device (24, 25, 26, 27) which can be controlled via a temperature-dependent resistor (20), and outputs an output voltage which changes with the ambient temperature at its output (15). 2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß als temperaturabhängiger Widerstand (20) ein in einer ersten Spannungsteilerschaltung (17, 18, 19) angeordneter Heißleiter verwendet wird, daß die Regeleinrichtung einen Operationsverstärker (24), einen diesem nachgeschalteten Transistor (25) und eine Gegenkopplung (26, 27) enthält, und daß der Operationsverstärker (24) an seinem invertierenden Eingang an eine Vorspannung (über 21, 22, 23) angeschaltet ist und an seinem nicht invertierenden Eingang mit der an der ersten Spannungsteilerschaltung (17, 18, 19, 20) abgegriffenen und entsprechend der sich durch Änderung des Widerstandswertes des temperaturabhängigen Widerstandes (20) ändernden Spannung steuerbar ist,2. Circuit arrangement according to claim 1, characterized in that a thermistor arranged in a first voltage divider circuit (17, 18, 19) is used as the temperature-dependent resistor (20), that the control device comprises an operational amplifier (24), a transistor (25) connected downstream thereof. and contains a negative feedback (26, 27), and that the operational amplifier (24) is connected at its inverting input to a bias voltage (via 21, 22, 23) and at its non-inverting Input with the voltage tapped at the first voltage divider circuit (17, 18, 19, 20) and controllable in accordance with the voltage changing by changing the resistance value of the temperature-dependent resistor (20), 3. Schaltungsanordnung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der nicht invertierende Eingang des Operationsverstärkers (24) mit dem Abgriff eines regelbaren Widerstandes (18) der ersten Spannungsteilerschaltung (17,18,19,20) verbunden ist, und daß der regelbare Widerstand (18) derart eingestellt ist, daß bei Raumtemperatur die Spannung am Ausgang (15) der Regelschaltung (16) der am invertierenden Eingang des Operationsverstärkers (24) anliegenden Spannung entspricht.3. Circuit arrangement according to claim 1 and 2, characterized in that the non-inverting input of the operational amplifier (24) with the tap of a controllable resistor (18) of the first voltage divider circuit (17,18,19,20) is connected, and that the controllable Resistor (18) is set such that at room temperature the voltage at the output (15) of the control circuit (16) corresponds to the voltage present at the inverting input of the operational amplifier (24). 4. Schaltungsanordnung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß als Gegenkopplung zwischen dem Ausgang und dem Eingang der Regeleinrichtung (24, 25) ein regelbarer Widerstand (26) vorgesehen ist.4. Circuit arrangement according to claims 1 to 3, characterized in that a controllable resistor (26) is provided as negative feedback between the output and the input of the control device (24, 25). 5. Schaltungsanordnung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der regelbare Widerstand (26) der Gegenkopplung durch eine Diode (27) überbrückt ist.5. Circuit arrangement according to claims 1 to 4, characterized in that the controllable resistor (26) of the negative feedback is bridged by a diode (27).
EP80100141A 1979-01-29 1980-01-11 Switching circuit for the temperature-dependent voltage regulation of piezoelectric printing nozzles in mosaic ink jet printers Expired EP0013918B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2903339 1979-01-29
DE2903339A DE2903339C3 (en) 1979-01-29 1979-01-29 Circuit arrangement for temperature-dependent voltage control for piezoelectric writing nozzles in ink mosaic writing devices

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EP0013918A1 true EP0013918A1 (en) 1980-08-06
EP0013918B1 EP0013918B1 (en) 1983-07-20

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US (1) US4275402A (en)
EP (1) EP0013918B1 (en)
JP (1) JPS6058700B2 (en)
AU (1) AU525216B2 (en)
CA (1) CA1129479A (en)
DE (1) DE2903339C3 (en)
MX (1) MX148250A (en)
ZA (1) ZA80476B (en)

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EP0099683A3 (en) * 1982-07-16 1985-12-27 Ing. C. Olivetti & C., S.P.A. Control system for ink jet printing element
US5381930A (en) * 1992-01-15 1995-01-17 Kalabakas; Peter Dispensing device for a measured volume of liquid
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Also Published As

Publication number Publication date
US4275402A (en) 1981-06-23
DE2903339A1 (en) 1980-07-31
JPS55101473A (en) 1980-08-02
ZA80476B (en) 1981-03-25
DE2903339C3 (en) 1987-06-19
CA1129479A (en) 1982-08-10
AU5497780A (en) 1980-08-07
JPS6058700B2 (en) 1985-12-21
EP0013918B1 (en) 1983-07-20
DE2903339B2 (en) 1980-11-13
AU525216B2 (en) 1982-10-28
MX148250A (en) 1983-03-30

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