EP0448578B1 - Heating device for heating the ink in the printing head of an ink jet printer - Google Patents
Heating device for heating the ink in the printing head of an ink jet printer Download PDFInfo
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- EP0448578B1 EP0448578B1 EP90900098A EP90900098A EP0448578B1 EP 0448578 B1 EP0448578 B1 EP 0448578B1 EP 90900098 A EP90900098 A EP 90900098A EP 90900098 A EP90900098 A EP 90900098A EP 0448578 B1 EP0448578 B1 EP 0448578B1
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- European Patent Office
- Prior art keywords
- ink
- heating
- coating
- layer
- heating device
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- 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
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14072—Electrical connections, e.g. details on electrodes, connecting the chip to the outside...
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- 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
- B41J2/14016—Structure of bubble jet print heads
- B41J2/14153—Structures including a sensor
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- 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
Definitions
- the invention relates to a heating device for heating the ink in the print head of an ink printing device according to the preamble of patent claim 1.
- a known principle for the representation of characters on a recording medium is based on the fact that under the action of a control individual ink droplets are ejected from nozzles of a writing head which is part of an ink printing device. By coordinating the ejection of individual droplets and the relative movement between the recording medium and the writing head, characters and / or graphic patterns are thereby built up in a grid pattern on the recording medium.
- the operational reliability and the quality of the recording depend to a large extent on the uniformity of the droplet ejection, ie the individual droplets ejected by a drive pulse must have a defined size and leave the nozzle of the print head at the same speed in each case.
- the temperature of the ink in the print head can be brought to a certain value and maintained.
- this results in relatively long heating-up times, particularly in the case of write heads with electrothermal converters.
- measures for cooling must be provided for write heads with electrothermal transducers because of the heating of the ink that occurs during the writing operation.
- the write head is usually arranged on a cooling surface, for example on an aluminum plate. If the ink has to be heated up after long pauses in writing or when the ink printing device is switched on, then the cooling surface must also be heated up as well. This results in relatively long heating times.
- Another possible embodiment according to this document is to cover the electrothermal transducers with a preheating device with overlaying and to provide them with a temperature control device. In this way it is possible to react to changes in the environmental conditions.
- the object of the invention is to provide a device for heating or for heating the ink for a print head in ink printing devices according to the preamble, with which the heating time is reduced, with which a reliable control with low control deviation is guaranteed, which also only requires little space Heating and, if necessary, sensor elements required and which can be produced and assembled with little effort.
- the heating and sensor component is integrated in the write head structure.
- the integration in the thin-layer structure allows the production of the complete print head in a single technology. This eliminates the need to provide and assemble your own heating and sensor elements and thus also additional soldering processes for the connecting lines of the individual components. Since the heating and sensor element are located in the immediate vicinity of the ink and the heating does not primarily cover the entire carrier, but the ink heats up immediately, resulting in short heating times. Further associated advantages are that the cooling surface of the write head can be increased if necessary, without the heating power for heating the ink having to be increased at the same time.
- FIG. 1 shows in section a part of a writing head in which the energy for ejecting the ink droplets is generated by thermal energy.
- print heads of this type are constructed using the so-called thin-film technology.
- a resistance layer 3 acting as an electrothermal transducer element and the contacts 4 and 5 for this resistance layer 3 are applied to a substrate 1 as a carrier between a first covering layer 2 and a second covering layer 6.
- the substrate 1 consists of silicon, the cover layers 2 and 6 made of silicon oxide (SiO2), the transducer element 3 made of hafnium boride (HfB2) and the contacts 4 and 5 made of aluminum (Al).
- the structure is completed by a cover plate 7 such that a row of ink channels 8 and a common ink space 9 are formed between the top cover layer 6 and the cover plate 7.
- An ink channel 8 is assigned to an outlet opening 10 of the write head.
- the ink space 9 common to all ink channels 8 is connected to an ink supply, not shown here.
- One transducer element 3 is assigned to an ink channel 8.
- the connection is the Contacting 5 for each individual transducer element 3 individually, the connection for contacting 4 is provided for several or all transducer elements together.
- the individual activation of a transducer element is associated with direct heating of the transducer element 3, which leads to the formation of an ink vapor bubble in the ink channel 8.
- a defined volume of ink is displaced both into the ink space 9, that is to say towards the outlet opening 10, and is ejected there in the form of a single droplet.
- a heating element in the form of a further thin-layer layer as the uppermost layer on the substrate 1 and thus in the greatest possible proximity to the ink in the ink space 9 is attached for heating the ink to a value at which the viscosity for the ejection process is optimal.
- an electrically insulating protective layer 13 above it. This also ensures that electrically conductive ink liquids can also be used.
- the protective layer 13 can be made of polyimide, for example.
- FIG. 1 shows the layer structure of a write head, in which the heating and sensor layers are realized by a single thin-layer layer.
- the heating layer is advantageously structured in a meandering manner. This achieves a sufficiently large electrical resistance that is matched to the voltage supply. For example, for a heating power of 5 W at a terminal voltage of 30 V, the resistance value can be 180 ohms.
- the arrangement of the heating and sensor layer in the form of a meandering structure is shown in FIG. 2. In the example, the heating and sensor layer 14 extends over the entire ink space 9 into the individual ink channels 8.
- the advantage is that because of the large temperature dependence of the electrical resistance of a heating layer made of nickel, the same layer can be used as a temperature sensor during the heating breaks. With such a construction concept, not only is an additional sensor component unnecessary, but the electrical supply lines for an additional sensor element are also eliminated.
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Abstract
Description
Die Erfindung betrifft eine Heizvorrichtung zur Erwärmung der Tinte im Schreibkopf einer Tintendruckeinrichtung gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a heating device for heating the ink in the print head of an ink printing device according to the preamble of patent claim 1.
Ein bekanntes Prinzip zur Darstellung von Zeichen auf einem Aufzeichnungsträger beruht darauf, daß unter der Einwirkung einer Steuerung einzelne Tintentröpfchen aus Düsen eines Schreibkopfes, der Bestandteil einer Tintendruckeinrichtung ist, ausgestoßen werden. Durch Abstimmung zwischen dem Ausstoß von Einzeltröpfchen und der Relativbewegung zwischen dem Aufzeichnungsträger und dem Schreibkopf werden dadurch Zeichen und/ oder grafische Muster auf dem Aufzeichnungsträger rasterförmig aufgebaut. Die Betriebssicherheit und die Qualität der Aufzeichnung hängen in hohem Maße von der Gleichmäßigkeit des Tröpfchenausstosses ab, d.h. die durch einen Ansteuerimpuls ausgestoßenen einzelnen Tröpfchen müssen eine definierte Größe besitzen und mit jeweils gleicher Geschwindigkeit die Düse des Schreibkopfes verlassen. Ganz wesentlich für einen gleichmäßigen Tröpfchenausstoß ist der Einfluß der Viskosität der Tinte. Diese ist in großem Maße von der Temperatur abhängig. Es ist deshalb bereits bekannt, die Temperatur der Tinte in einem Tintenschreibkopf auf einem konstanten Wert zu halten. Für einen Schreibkopf, bei dem einzelne Tintenkanäle vorgesehen sind, die an Austrittsdüsen einer Düsenplatte enden, ist es bekannt, in der Düsenplatte ein Heizelement vorzusehen (DE-OS 26 59 398). Weiterhin ist es für derartige Schreibköpfe bekannt, im Bereich der Düsenplatte eine Induktionsspule vorzusehen und die Düsenplatte durch Wirbelströme und Ummagnetisierungsverluste aufzuheizen (DE-OS 35 00 820).A known principle for the representation of characters on a recording medium is based on the fact that under the action of a control individual ink droplets are ejected from nozzles of a writing head which is part of an ink printing device. By coordinating the ejection of individual droplets and the relative movement between the recording medium and the writing head, characters and / or graphic patterns are thereby built up in a grid pattern on the recording medium. The operational reliability and the quality of the recording depend to a large extent on the uniformity of the droplet ejection, ie the individual droplets ejected by a drive pulse must have a defined size and leave the nozzle of the print head at the same speed in each case. The influence of the viscosity of the ink is very important for a uniform droplet ejection. This is largely dependent on the temperature. It is therefore already known to keep the temperature of the ink at a constant value in an ink writing head. For a write head in which individual ink channels are provided which end at outlet nozzles of a nozzle plate, it is known to provide a heating element in the nozzle plate (DE-OS 26 59 398). Furthermore, it is known for such write heads to provide an induction coil in the region of the nozzle plate and to heat the nozzle plate by means of eddy currents and magnetic reversal losses (DE-OS 35 00 820).
Neuerdings ist es bekannt geworden, den Ausstoß einzelner Tintentröpfchen dadurch zu erreichen, daß im Bereich eines im Tintenkanal angeordneten elektro-thermischen Energiewandlers eine Tintendampfblase erzeugt wird, die ein bestimmtes Tintenvolumen als Tröpfchen aus dem Tintenkanal ausstößt. Derartige Schreibköpfe können nach der sog. Dünnschichttechnik aufgebaut werden. Auch für Schreibköpfe dieser Art ist die Temperaturabhängigkeit der Viskosität der Tinte ein sehr wesentlicher Faktor. Es ist deshalb auch für Schreibköpfe der genannten Art bekannt, die Ausstoßbedingungen durch eine Erwärmung der Tinte zu verbessern. Das kann durch zusätzliche von außen auf die Tinte einwirkende Heizelemente geschehen (beispielsweise DE-OS 29 43 164; DE-OS 35 45 689). Als Heizelemente finden dafür häufig Kaltleiter Verwendung. In Verbindung mit einer Steuerung und einem Temperatur-Sensorelement, für das häufig ein Heißleiter eingesetzt wird, kann damit die Temperatur der Tinte im Schreibkopf auf einen bestimmten Wert gebracht und gehalten werden. Allerdings ergeben sich damit insbesondere bei Schreibköpfen mit elektrothermischen Wandlern relativ lange Aufheizzeiten. Der Grund dafür ist, daß für Schreibköpfe mit elektrothermischen Wandlern wegen der im laufenden Schreibbetrieb auftretenden Erwärmung der Tinte Maßnahmen zur Kühlung vorgesehen sein müssen. Dazu ist der Schreibkopf üblicherweise auf einer Kühlfläche, z.B. auf einer Aluminiumplatte, angeordnet. Wenn nach längeren Schreibpausen oder bei der Einschaltung der Tintendruckeinrichtung die Tinte aufgeheizt werden muß, dann muß stets die Kühlfläche ebenfalls mit aufgeheizt werden. Dadurch ergeben sich relativ lange Aufheizzeiten. Außerdem ist der damit verbundene konstruktive und fertigungstechnische Aufwand nicht unerheblich, da jeweils zusätzliche Einzelelemente bereitgehalten, montiert und elektrisch angeschlossen werden müssen. Es ist aus der DE-A-29 43 164 bekannt, entweder im Inneren des Tintenraumes eine Heizspule anzuordnen (direkte Heizung), oder eine Heizspule ebenfalls im Tintenraum anzuordnen, aber eine Beschichtung der Heizwendel (indirekte Heizung) vorzusehen. Im ersten Fall ergeben sich neben dem konstruktiven Aufwand, wie relativ großvolumige Anordnungen, zusätzliche Probleme dadurch, daß die Tintenflüssigkeit an der Heizfläche chemisch reagiert und dadurch Ablagerungen auftreten können.It has recently become known to achieve the ejection of individual ink droplets by generating an ink vapor bubble in the region of an electro-thermal energy converter arranged in the ink channel, which bubble ejects a specific volume of ink as droplets from the ink channel. Such write heads can be constructed using the so-called thin-film technique. The temperature dependence of the viscosity of the ink is also a very important factor for print heads of this type. It is therefore also known for print heads of the type mentioned to improve the ejection conditions by heating the ink. This can be done by additional heating elements acting on the ink from the outside (for example DE-OS 29 43 164; DE-OS 35 45 689). PTC thermistors are often used as heating elements. In conjunction with a controller and a temperature sensor element, for which a thermistor is often used, the temperature of the ink in the print head can be brought to a certain value and maintained. However, this results in relatively long heating-up times, particularly in the case of write heads with electrothermal converters. The reason for this is that measures for cooling must be provided for write heads with electrothermal transducers because of the heating of the ink that occurs during the writing operation. For this purpose, the write head is usually arranged on a cooling surface, for example on an aluminum plate. If the ink has to be heated up after long pauses in writing or when the ink printing device is switched on, then the cooling surface must also be heated up as well. This results in relatively long heating times. In addition, the associated design and manufacturing expenditure is not insignificant, since additional individual elements must be kept ready, assembled and electrically connected. It is from DE-A-29 43 164 known either to arrange a heating coil in the interior of the ink chamber (direct heating), or to also arrange a heating coil in the ink chamber, but to provide a coating on the heating coil (indirect heating). In the first case, in addition to the design effort, such as relatively large-volume arrangements, there are additional problems in that the ink liquid reacts chemically on the heating surface and deposits can occur as a result.
Eine andere Ausführungsmöglichkeit besteht gemäß dieser Druckschrift darin, die elektrothermischen Wandler mit einer Vorwärmeinrichtung unter Überschichtung zu überdecken und mit einer Temperatursteuereinrichtung zu versehen. Dadurch kann auf Änderungen der Umweltbedingungen reagiert werden.Another possible embodiment according to this document is to cover the electrothermal transducers with a preheating device with overlaying and to provide them with a temperature control device. In this way it is possible to react to changes in the environmental conditions.
Aufgabe der Erfindung ist es, für einen Schreibkopf in Tintendruckeinrichtungen gemäß dem Oberbegriff eine Vorrichtung zur Erwärmung bzw. zur Aufheizung der Tinte anzugeben, mit der die Aufheizzeit reduziert wird, mit der eine zuverlässige Regelung mit geringer Regelabweichung gewährleistet ist, die weiterhin nur geringen Platzbedarf für Heiz- und bedarfsweise Sensorelemente erfordert und die aufwandsarm herstellbar und montierbar ist.The object of the invention is to provide a device for heating or for heating the ink for a print head in ink printing devices according to the preamble, with which the heating time is reduced, with which a reliable control with low control deviation is guaranteed, which also only requires little space Heating and, if necessary, sensor elements required and which can be produced and assembled with little effort.
Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen gekennzeichnet.This object is achieved in accordance with the characterizing features of patent claim 1. Advantageous refinements are characterized in the subclaims.
Die Vorteile der erfindungsgemäßen Lösung liegen darin, daß das Heiz- und Sensorbauelement in den Schreibkopfaufbau integriert ist. Die Integration in den Dünnschichtaufbau erlaubt die Herstellung des kompletten Schreibkopfes in einer einzigen Technologie. Dadurch entfallen Bereitstellung und Montage eigener Heiz- und Sensorelemente und somit auch zusätzliche Anlötvorgänge für die Anschlußleitungen der Einzelbauelemente. Da das Heiz- und Sensorelement in unmittelbarer Nähe der Tinte angeordnet sind, und die Heizung nicht primär den gesamten Träger, sondern unmittelbar die Tinte aufheizt, ergeben sich kurze Aufheizzeiten. Weitere damit verbundene Vorteile bestehen darin, daß die Kühlfläche des Schreibkopfes bedarfsweise vergrößert sein kann, ohne daß zugleich die Heizleistung für die Tintenerwärmung erhöht werden muß.The advantages of the solution according to the invention are that the heating and sensor component is integrated in the write head structure. The integration in the thin-layer structure allows the production of the complete print head in a single technology. This eliminates the need to provide and assemble your own heating and sensor elements and thus also additional soldering processes for the connecting lines of the individual components. Since the heating and sensor element are located in the immediate vicinity of the ink and the heating does not primarily cover the entire carrier, but the ink heats up immediately, resulting in short heating times. Further associated advantages are that the cooling surface of the write head can be increased if necessary, without the heating power for heating the ink having to be increased at the same time.
Die Erfindung wird im folgenden anhand eines Ausführungsbeispieles erläutert, wozu auf die Zeichnungen verwiesen wird.
Dort zeigen
- Fig. 1 und Fig. 2
- ein Ausführungsbeispiel, bei dem der Heizwiderstand zugleich als Sensorelement dient.
Show there
- 1 and 2
- an embodiment in which the heating resistor also serves as a sensor element.
Figur 1 zeigt im Schnitt einen Teil eines Schreibkopfes, bei dem die Energie für den Ausstoß der Tintentröpfchen durch thermische Energie erzeugt wird. Schreibköpfe dieser Art werden bekanntlich in der sog. Dünnschichttechnik aufgebaut.FIG. 1 shows in section a part of a writing head in which the energy for ejecting the ink droplets is generated by thermal energy. As is well known, print heads of this type are constructed using the so-called thin-film technology.
Auf einem Substrat 1 als Träger werden zwischen einer ersten Abdeckschicht 2 und einer zweiten Abdeckschicht 6 eine als elektrothermisches Wandlerelement wirkende Widerstandsschicht 3 sowie die Kontaktierungen 4 und 5 für diese Widerstandsschicht 3 aufgebracht. Vorzugsweise besteht das Substrat 1 aus Silizium, die Abdeckschichten 2 und 6 aus Siliziumoxid (SiO₂), das Wandlerelement 3 aus HafniumBorid (HfB₂) und die Kontaktierungen 4 und 5aus Aluminium (Al). Nach oben hin wird der Aufbau durch eine Deckplatte 7 derart abgeschlossen, daß zwischen der obersten Abdeckschicht 6 und der Deckplatte 7 eine Reihe von Tintenkanälen 8 und ein gemeinsamer Tintenraum 9 ausgebildet sind. Jeweils ein Tintenkanal 8 ist einer Austrittsöffnung 10 des Schreibkopfes zugeordnet. Der für alle Tintenkanäle 8 gemeinsame Tintenraum 9 ist mit einer hier nicht dargestellten Tintenversorgung verbunden. Jeweils ein Wandlerelement 3 ist jeweils einem Tintenkanal 8 zugeordnet.A resistance layer 3 acting as an electrothermal transducer element and the contacts 4 and 5 for this resistance layer 3 are applied to a substrate 1 as a carrier between a first covering layer 2 and a
Zum Ausstoß eines Tintentröpfchens wird über die Anschlüsse der Kontaktierungen 4 und 5 Strom an das Wandlerelement 3 gelegt. Bei einem Mehrdüsenschreibkopf ist der Anschluß der Kontaktierung 5 für jedes einzelne Wandlerelement 3 individuell, der Anschluß für die Kontaktierung 4 für mehrere oder auch alle Wandlerelemente gemeinsam vorgesehen. Mit der individuellen Ansteuerung eines Wandlerelementes ist eine unmittelbare Erwärmung des Wandlerelementes 3 verbunden, die im Tintenkanal 8 zur Ausbildung einer Tintendampfblase führt. Dadurch wird ein definiertes Tintenvolumen sowohl in den Tintenraum 9, also auch in Richtung zur Austrittsöffnung 10 hin verdrängt und dort in Form eines Einzeltröpfchens ausgestoßen.To eject an ink droplet, current is applied to the transducer element 3 via the connections of the contacts 4 and 5. With a multi-nozzle print head, the connection is the Contacting 5 for each individual transducer element 3 individually, the connection for contacting 4 is provided for several or all transducer elements together. The individual activation of a transducer element is associated with direct heating of the transducer element 3, which leads to the formation of an ink vapor bubble in the
Erfindungsgemäß ist zur Erwärmung der Tinte auf einen Wert, bei dem die Viskosität für den Ausstoßvorgang optimal ist, ein Heizelement in Form einer weiteren Dünnschichtlage als oberste Lage auf dem Substrat 1 und somit in größtmöglicher Nähe zur Tinte im Tintenraum 9 angebracht. Um Einwirkungen der Tintenflüssigkeit auf die Materialeigenschaften der Heizschicht 14 zu vermeiden, ist es vorteilhaft, eine darüberliegende, elektrisch isolierende Schutzschicht 13 vorzusehen. Dadurch wird zugleich sichergestellt, daß auch elektrisch leitende Tintenflüssigkeiten verwendet werden können. Die Schutzschicht 13 kann beispielsweise aus Polyimid bestehen.According to the invention, a heating element in the form of a further thin-layer layer as the uppermost layer on the substrate 1 and thus in the greatest possible proximity to the ink in the
Als Material für die Heizschicht wird ein Material mit einer großen Temperaturabhängigkeit seines Widerstandswertes verwendet. Hierfür kommt z.B. Nickel in Betracht. Damit ergibt sich der Vorteil, daß eine derart gebildete Heizschicht sowohl als Heizelement als auch als Sensorelement dient. Den Schichtaufbau eines Schreibkopfes, bei dem Heiz- und Sensorschicht durch eine einzige Dünnschichtlage realisiert sind, zeigt Figur 1. Mit Vorteil wird die Heizschicht mäanderförmig strukturiert. Man erreicht damit einen auf die Spannungsversorgung abgestimmten ausreichend großen elektrischen Widerstand. Beispielsweise kann für eine Heizleistung von 5 W bei einer Klemmenspannung von 30 V der Widerstandswert 180 Ohm betragen. Die Anordnung der Heiz- und Sensorschicht in Form einer mäanderförmigen Strukturierung zeigt Figur 2. Die Heiz- und Sensorschicht 14 erstreckt sich im Beispiel über den gesamten Tintenraum 9 bis in die einzelnen Tintenkanäle 8 hinein.A material with a large temperature dependence of its resistance value is used as the material for the heating layer. For example, nickel can be used for this. This has the advantage that a heating layer formed in this way serves both as a heating element and as a sensor element. FIG. 1 shows the layer structure of a write head, in which the heating and sensor layers are realized by a single thin-layer layer. The heating layer is advantageously structured in a meandering manner. This achieves a sufficiently large electrical resistance that is matched to the voltage supply. For example, for a heating power of 5 W at a terminal voltage of 30 V, the resistance value can be 180 ohms. The arrangement of the heating and sensor layer in the form of a meandering structure is shown in FIG. 2. In the example, the heating and
Der Vorteil besteht darin, daß wegen der großen Temperaturabhängigkeit des elektrischen Widerstandes einer aus Nickel bestehenden Heizschicht in den Heizpausen die gleiche Schicht als Temperatursensor eingesetzt werden kann. Bei einem derartigen Aufbaukonzept wird nicht nur ein zusätzliches Sensorbauelement unnötig, sondern es entfallen auch die elektrischen Zuleitungen für ein zusätzliches Sensorelement.The advantage is that because of the large temperature dependence of the electrical resistance of a heating layer made of nickel, the same layer can be used as a temperature sensor during the heating breaks. With such a construction concept, not only is an additional sensor component unnecessary, but the electrical supply lines for an additional sensor element are also eliminated.
Claims (3)
- A heating device for heating the ink in the printing head of an ink printing device having several ink ducts (8) which end in outlet apertures (10) and which communicate with a common ink chamber (9) and having individually controllable electrothermal transducer components (3) which are associated with each ink duct (8) and under the effect of which an ejection of ink as droplets from the outlet apertures (10) is effected, the printing head being constructed in layered type of construction, characterised in that a further coating (14), which serves both as a heating layer for heating the ink and as a temperature sensor layer for ascertaining the temperature of the ink, is applied to the topmost coating (2,3,4,5,6), defining the ink chamber (9) and the ink ducts (8) and comprising the electrothermal transducer components, of a substrate (1), and in which respect the coating (14) is contactable from the outside and is covered by a further protective coating (13) and extends in a large-area manner over the region of the ink chamber (9).
- A heating device according to claim 1, characterised in that the coating (14) is structured in a meander-shaped manner.
- A heating device according to claim 1, characterised in that the coating (14) consists of a material the resistance value of which has great temperature dependency and in that in heating pauses the coating (14) is effective as a temperature sensor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP88120856 | 1988-12-14 | ||
| EP88120856 | 1988-12-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0448578A1 EP0448578A1 (en) | 1991-10-02 |
| EP0448578B1 true EP0448578B1 (en) | 1993-10-06 |
Family
ID=8199662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90900098A Expired - Lifetime EP0448578B1 (en) | 1988-12-14 | 1989-11-30 | Heating device for heating the ink in the printing head of an ink jet printer |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5191360A (en) |
| EP (1) | EP0448578B1 (en) |
| JP (1) | JPH04506481A (en) |
| DE (1) | DE58905857D1 (en) |
| WO (1) | WO1990006851A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6189989B1 (en) * | 1993-04-12 | 2001-02-20 | Canon Kabushiki Kaisha | Embroidering using ink jet printing apparatus |
| EP0661157B1 (en) * | 1993-12-28 | 2001-05-09 | Canon Kabushiki Kaisha | Ink jet recording head, ink jet recording apparatus having same, and ink jet head manufacturing method |
| US5901425A (en) | 1996-08-27 | 1999-05-11 | Topaz Technologies Inc. | Inkjet print head apparatus |
| DE60016503T2 (en) * | 1999-06-04 | 2005-12-15 | Canon K.K. | Liquid ejection head, liquid ejection device and method of manufacturing a liquid ejection head |
| US8194254B2 (en) * | 2007-01-30 | 2012-06-05 | Hewlett-Packard Development Company, L.P. | Print device preconditioning |
| JP5213367B2 (en) * | 2007-07-02 | 2013-06-19 | キヤノン株式会社 | Inkjet recording head |
| US20090033950A1 (en) * | 2007-07-30 | 2009-02-05 | Hewlett-Packard Development | Printhead preconditioning trigger |
| JP4957452B2 (en) * | 2007-08-22 | 2012-06-20 | ブラザー工業株式会社 | Liquid transfer device |
| US8083323B2 (en) * | 2008-09-29 | 2011-12-27 | Xerox Corporation | On-chip heater and thermistors for inkjet |
| JP2011207077A (en) * | 2010-03-30 | 2011-10-20 | Seiko Epson Corp | Liquid ejecting head, liquid ejecting head unit, and liquid ejecting apparatus |
| JP5510244B2 (en) * | 2010-09-28 | 2014-06-04 | セイコーエプソン株式会社 | Liquid jet head |
| JP6249682B2 (en) * | 2013-08-27 | 2017-12-20 | キヤノン株式会社 | Liquid discharge head substrate, liquid discharge head, and recording apparatus. |
| US20180171468A1 (en) * | 2016-12-21 | 2018-06-21 | Ncc Nano, Llc | Method for deposting a functional material on a substrate |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58220757A (en) * | 1982-06-18 | 1983-12-22 | Canon Inc | Liquid jet recording head |
| US4899180A (en) * | 1988-04-29 | 1990-02-06 | Xerox Corporation | On chip heater element and temperature sensor |
| ES2096191T3 (en) * | 1988-10-31 | 1997-03-01 | Canon Kk | HEAD FOR PRINTING BY LIQUID JETS AND APPARATUS FOR PRINTING BY LIQUID JETS PROVIDED WITH THE HEAD. |
| US4910528A (en) * | 1989-01-10 | 1990-03-20 | Hewlett-Packard Company | Ink jet printer thermal control system |
-
1989
- 1989-11-30 EP EP90900098A patent/EP0448578B1/en not_active Expired - Lifetime
- 1989-11-30 JP JP2500549A patent/JPH04506481A/en not_active Withdrawn
- 1989-11-30 WO PCT/EP1989/001452 patent/WO1990006851A1/en active IP Right Grant
- 1989-11-30 DE DE90900098T patent/DE58905857D1/en not_active Expired - Fee Related
-
1991
- 1991-06-14 US US07/715,782 patent/US5191360A/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, vol.11, nr. 39 (M-559)(2486) 5 February 1987; JP-A-61 206657 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US5191360A (en) | 1993-03-02 |
| EP0448578A1 (en) | 1991-10-02 |
| DE58905857D1 (en) | 1993-11-11 |
| WO1990006851A1 (en) | 1990-06-28 |
| JPH04506481A (en) | 1992-11-12 |
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