EP0479784B1 - Dispositif servant a chauffer l'encre dans la tete d'ecriture d'une imprimante a encre - Google Patents

Dispositif servant a chauffer l'encre dans la tete d'ecriture d'une imprimante a encre Download PDF

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Publication number
EP0479784B1
EP0479784B1 EP90900163A EP90900163A EP0479784B1 EP 0479784 B1 EP0479784 B1 EP 0479784B1 EP 90900163 A EP90900163 A EP 90900163A EP 90900163 A EP90900163 A EP 90900163A EP 0479784 B1 EP0479784 B1 EP 0479784B1
Authority
EP
European Patent Office
Prior art keywords
heating
bridge
temperature
arrangement
ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90900163A
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German (de)
English (en)
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EP0479784A1 (fr
Inventor
Andreas Kappel
Rudolf Probst
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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
    • B41J2/04548—Details of power line section of control 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
    • B41J2/04563—Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink 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
    • B41J2/0458—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on heating elements forming bubbles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14379—Edge shooter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/11—Embodiments of or processes related to ink-jet heads characterised by specific geometrical characteristics

Definitions

  • the invention relates to an arrangement 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 record carrier is based on the fact that under the action of an electronic control individual ink droplets are ejected from nozzles of a writing head which is part of an ink printing device.
  • characters and / or graphic patterns are thereby built up on the recording medium in a grid pattern within a character matrix.
  • the operational reliability and 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 boundary conditions for uniform droplet ejection are diverse.
  • the ink drop formation or the ink jet formation, the ink drop mass and the flight speed of the ink drops in such printing devices depend to a large extent on the viscosity of the ink. Since the viscosity of the ink is temperature-dependent, on the one hand to ensure that an ink ejection process is possible at all at different ambient temperatures and that on the other hand this ink ejection process is as defined and stable as possible, the ink is heated with sufficient accuracy using a heating device. It is therefore already known to keep the temperature of the ink at a constant value in an ink writing head.
  • 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 preheating 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, surrender This means that heating-up times are relatively long, particularly with print heads with electrothermal transducers.
  • the object on which the invention is based is therefore to provide an arrangement for preheating or heating the ink for a write head in ink printing devices according to the preamble, which ensures good control behavior at low manufacturing costs with short heating times and low power consumption of the arrangement.
  • the heating resistor in the form of a heating meander directly from one of the two electrically conductive thin films deposited on the base oxide for thermal converters and conductor tracks in empty spaces present on the substrate, an arrangement for heating the ink can be easily realized. No additional process step is necessary because the layout of the heating meander can be incorporated into the corresponding exposure and etching masks for the thermal converter and the conductor tracks.
  • the heating meander is also covered at the same time by the obligatory covering of thermal converters and conductor tracks with an insulator.
  • such an arrangement has the advantage that due to the small thickness of the base oxide (typically 3 ⁇ m SiO2) there is a very good thermal coupling of the heating meander to the heat-conducting substrate (typically silicon). This means that high heating outputs can be achieved with short heating-up times without the risk of thermal overloading of the heating meander. Since in the arrangement according to the invention the heating meander and the ink are in close spatial contact over a large area, a lower heating output is sufficient to set the desired temperature, than in the case of an external heating element.
  • the base oxide typically 3 ⁇ m SiO2
  • the heat-conducting substrate typically silicon
  • the high thermal conductivity of the silicon substrate leads to a largely homogeneous heat distribution within the entire print head, even if the heating meanders cannot be distributed uniformly over the print head due to the available empty spaces.
  • the heating meander it is particularly advantageous for the heating meander to use materials with high temperature coefficients (e.g. aluminum) because then, by evaluating the electrical resistance of the heating meander, it can be used as a heat source and at the same time as a temperature sensor. This results in a very good response and control behavior, since there are no dead times between the temperature sensor and the heating element.
  • materials with high temperature coefficients e.g. aluminum
  • a temperature signal can be obtained in a simple manner, which serves as an input variable for a control circuit.
  • the temperature useful signal can also be doubled.
  • An ink printing device shown only in part in FIG. 1 works according to the thermal converter principle (bubble jet).
  • the process for building pressure in the ink is based on the creation of small microbubbles in the ink.
  • An electrothermal transducer element in the form of a thin film resistor with lateral dimensions of typically 150 ⁇ m x 30 ⁇ m and a thickness of approx. 200 nm serves as the actuator.
  • This transducer element is located directly in an ink channel at a certain distance from the outlet nozzle.
  • the converter element is loaded with a power of 6 watts for a short period of time, for example 7 microseconds. After 5 ⁇ s the heating layer of the transducer element has reached a temperature of approx.
  • FIG. 1 shows the construction and the essential components of such an ink print head.
  • a base plate 1 usually made of aluminum, on which a substrate 2 serving as a carrier is applied, for example glued.
  • a silicon wafer serves as substrate 2.
  • An approximately 3 ⁇ m thick first covering layer 3 made of silicon dioxide SiO 2 is deposited on this substrate 2 by means of a chemical process (chemical vapor deposition CVD) as a heat barrier and insulation layer.
  • This silicon dioxide layer can also be produced by thermal oxidation of the silicon wafer.
  • a resistance layer 4 acting as an electrothermal transducer element and aluminum layers 5, 6 serving as conductor tracks for these thermal transducers 4 are sputtered onto this wafer which has been pretreated in this way.
  • a further CVD process with an approximately 2 ⁇ m thick second covering layer 7 made of silicon dioxide (SiO2) for the insulation and mechanical stabilization of the thermal converter 4 follows.
  • the thermal converter 4 an approximately 0.6 ⁇ m thick tantalum layer 14 is applied as protection against cavitation.
  • An approximately 2 ⁇ m thick polyamide layer 8 additionally spun onto the second cover layer 7 as corrosion protection covers the tantalum layer 14 at its edges and forms a lower wall for both an ink chamber 13 and for the ink channels 10, which proceed from the ink chamber 13 into a Exit opening 9 open at a so-called nozzle plate and are insulated from one another by duct partitions 18.
  • An outlet opening 9 and a thermal converter 4 are each assigned to an ink channel 10.
  • the structure is completed by an adhesive layer 11 and an adjoining cover plate 12 such that a between the polyamide layer 8 and the adhesive layer 11 Row of ink channels 10 and the common to all ink channels 10 ink chamber 13 are formed, which is connected via an ink supply line 16 and an ink reservoir 17.
  • a heating device in the form of a heating resistor 15 integrated into the first metallization level of the ink print head is provided according to FIG Thin film substrate existing voids is generated.
  • the thermal transducers 4 and the corresponding feed lines are arranged symmetrically on the thin film substrate 2 with respect to the axis AA ', it is sufficient for the following considerations to show only a section (left half) of the conductor track layout for such a write head.
  • This has 50 thermal converters 4, which are supplied electrically via supply lines - one outgoing and return line per thermal converter 4. These leads lead as conductor tracks 5, 6 from the thermal transducers 4 arranged in an area near the edge of the write head to a connection field 19 on the opposite side of this level, where the conductor tracks are contacted with individual conductors of a connection cable, not shown here.
  • the conductor tracks 5, 6 are fanned out on the thin film substrate 2. Accordingly, the conductor tracks 5, 6, starting from the thermal converters 4 in conductor tracks with a narrow pitch 26 and in the region of the connection field 19 in conductor tracks are further pitch 27 broken down.
  • a transition structure 28 connects the conductor tracks of narrow pitch 26 with the conductor tracks of further pitch 27.
  • this transition structure 28 in particular the track width and the gap width, that is, the distance between two adjacent tracks, depending on the track widths and gap widths in the other two areas achieve a lead resistance that is as equal as possible and as low as possible for all thermal converters 4. This is particularly important for stable operation of the ink printing device, since the amount of heat released in the various thermal converters 4 of the writing head per print pulse must be the same within narrow limits. Otherwise there is a risk of destroying individual thermal converters 4 due to overheating.
  • the conductor tracks are combined in a total of 8 groups in the connection field 19.
  • the two groups which are located directly next to the line of symmetry AA ', seven thermal converters 4 with their 14 conductor tracks - one forward and return line per thermal converter 4- are combined, while the remaining 6 groups each have six Combine thermal converter 4 with its 12 conductor tracks.
  • the connecting line per thermal converter 4 is shown in FIG. The exact wiring of the total of 100 conductor tracks for the 50 thermal converters 4 will be explained in more detail later with reference to FIG. 4.
  • Such a combination of the individual conductor tracks into groups and the division into three areas with different divisions create empty spaces between the conductor tracks of two adjacent groups, the widths of which correspond to the group spacings 20, 21 in FIG. 2 and which are used to place an ink heater.
  • the ink heater is introduced into these empty spaces in the form of a resistance meander.
  • the two leads of the heating resistor 15 run in the edge region of the substrate surface to the connection field 19 and end at connection lugs 29, of which only one of these connection lugs 29 is shown in FIG.
  • the heating resistor 15 is divided into several sections which are connected in the connection field 19 to a contact bridge 24. The end of a section is connected to the beginning of the next section according to FIG. 4, so that there is an overall series connection of the sections and a heating voltage can be applied to the connecting tabs 29 of the heating resistor 15.
  • FIG. 4 shows an enlarged section of the connection field 19 with the conductor tracks combined into a group. While the conductor tracks 5, hereinafter referred to as individual conductor tracks, have at their free ends widened areas in the form of contact tabs 22, on which they are contacted with a single conductor of a connecting cable, the conductor tracks 6 the thermocouple 4 combined into a group together on a relatively large-area ground bridge 25. On the ground bridge 25, contact lugs 23 are also formed on their two end faces in the direction of the conductor tracks 5, 6, so that overall a geometrically uniform, comb-like structured contact strip is formed in the connection field 19 results.
  • the forward and return lines of a section of the heating resistor 15 are carried out and connected by means of a contact bridge 24.
  • the group shown in FIG. 4 is assigned six thermal converters 4 with their total of 12 conductor tracks, but only 7 connections are required to make contact with this group (6 individual lines and one ground line).
  • the targeted activation of the individual thermal transducers 4 can take place via a passive network, for example via a diode decoding matrix known per se.
  • a material with a large temperature dependence of its resistance value is used as the material for this heating resistor 15.
  • this temperature coefficient of the electrical resistance of the heating resistor 15 it is used as a heat source for the ink liquid and at the same time as a temperature sensor.
  • a resistor arrangement in the form of a bridge circuit according to FIG. 5 is used for heating and for temperature measurement, in which the temperature-sensitive resistors and the heating resistors are located on the thin film substrate.
  • R1, R2, R3 and R4 are the bridge resistances (temperature measuring and / or heating resistors) with their temperature coefficient ⁇ 1 to ⁇ 4 referred to a measuring bridge are interconnected.
  • at least one of the bridge resistors is used for heating and at least one of the bridge resistors is used for temperature measurement (heating and temperature measuring resistor / measuring resistors can also be identical).
  • An arrangement in which several / all tolerance-critical components of the resistance bridge are integrated into the first metallization level of the write head is particularly advantageous.
  • FIG. 1 Another possibility for the connection of the measuring bridge / heating bridge is shown in FIG.
  • the measuring voltage U B is applied to the bridge resistors R 1 and R 3 via a protective diode D.
  • the protective diode D ensures reaction-free heating or measuring.
  • the heating current I H is fed separately on the left branch of the bridge.
  • the temperature signal ⁇ ⁇ (T) can be removed analogously to the measuring bridges described.
  • the temperature is measured periodically first and then, depending on the measurement result, the heating resistor R2 is energized in a targeted manner.
  • a small measuring current I M flows through the bridge compared to the heating current I H. This ensures that the measuring current I M only causes an insignificant heating of the temperature sensor.
  • the temperature signal of one or both bridge branches can also be evaluated.
  • heating controllers can be used for ink heating.
  • the heating resistor is integrated in the measuring bridge.
  • FIG. 8 shows the basic circuit of an analog comparator with a floating measuring bridge. While the bridge resistors are designated by the reference symbols R1, R3, R4, the resistor R2 represents the temperature-dependent heating resistor with a positive temperature coefficient (PTC).
  • a comparator K is used to evaluate the temperature signal ⁇ (T) in the diagonal branch, the output of which is connected to the base of a switching transistor ST via a resistor (not shown).
  • a resistor R B is connected to the base to generate a base bias.
  • the measuring voltage U B is on the collector-emitter path of the switching transistor ST and a polarized in the flow direction protection diode D to the Bridge resistors R1 and R3 placed.
  • a resistor R m between the emitter of the switching transistor ST and the cathode of the protective diode D serves to ensure a defined bridge potential, ie a small bridge current always flows, for example even if the ambient temperature is higher than the control temperature.
  • FIGS 9 and 10 show two examples of clocked heating controllers, in each of which only the heating resistor R2 is energized. Both circuits have in common that they are operated with an external system clock S and have the same measuring bridge arrangement as was described with reference to FIG. Only the bridge resistors R3 and R4 are replaced by a single resistor R34 with a tap for the purpose of balancing the bridge.
  • the reference symbol V DD denotes the supply voltage for the measuring bridge and the logic modules IC1, IC2.
  • the positive pole of the heating voltage U H is connected to the left center of the bridge via the emitter-collector path of a switching transistor ST.
  • the temperature signal ⁇ ⁇ (T) tapped at the bridge diagonal is led via two resistors R Br, R7 to the input terminals of a comparator IC1, which in turn are connected to a capacitor C.
  • the supply voltage V DD is applied to both the series connection of the emitter-collector path of a transistor T1 and a protective diode D to the bridge resistors R1 and R34 and a resistor R8 to the collector of another transistor T2.
  • Another resistor R9 is connected between the collector of the transistor T2 and the base of the switching transistor T1.
  • a control input S is a clock signal, which is passed through a resistor R10 to the base of the transistor T2 and a resistor R11 to the base of a transistor T3.
  • the two emitters the transistors T2, T3 are connected to a ground potential of zero volts.
  • this clock signal S controls a memory element IC2 via an input CL.
  • the output of the comparator IC1 is connected on the one hand to a data input D 1 of this memory element IC2 and on the other hand via a resistor R5 to the supply voltage + V DD .
  • a data output Q1 is connected via a resistor R14 to the base of transistor T3 and the collector of a transistor T4. While the emitter of the transistor T4 is grounded, the collector is connected to the base of the switching transistor ST or the supply voltage + U H via a voltage divider consisting of the resistors R13 and R12.
  • those parts which form the heating circuit HK are outlined with a dash-dotted line, those parts which form the temperature measuring circuit TM with a dashed line. From the overlap of these two borders it can also be seen again that the resistor R2 is used both as a heating resistor and as a temperature sensor.
  • a dual mono flop is used as the memory element IC3. Since the heating circuit HK and the temperature measuring circuit TM are identical in both circuits, only those switching connections are described with reference to FIG. 10 which result from the use of the different memory elements.
  • the output of the comparator IC1 is connected to the terminal 11 and the base of the transistor T1 through a resistor R14 to the terminals 5 and 7 of the memory element IC3.
  • a resistor R17 there is a connection between the base of the transistor T4 via a resistor R17 with the terminals 10 and 12 of the memory element IC3.
  • the system clock S is connected to terminal 4 of the memory element IC3.
  • a capacitor C2 between the terminals 2 and 3, a capacitor C3 is connected.
  • the supply voltage V DD is on the one hand directly to the terminals 3, 12 and 16 and via adjustable resistors R 1, R 1 to the terminals 14 and 2.
  • terminals 1,8 and 15 are connected to ground potential.
  • a measuring current I M flows through the measuring bridge during the period t 1; the measured temperature t R2 of the heating resistor R2 is lower than the target temperature t target during this period of time according to line b and consequently the heating resistor R2 is energized during the period t2.
  • the temperature t R2 rises.
  • a measurement of the temperature begins again. Since this is above the target temperature t target , the heating resistor R2 is not energized during the next half period of the system clock S. Since the temperature t R2 is still greater than the temperature t target at the next measuring cycle (designated on the time axis with t i ), the heating resistor R2 is not energized even in the following half-cycle of the system cycle S.

Landscapes

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

Abstract

On réalise le dispositif de chauffage d'une tête d'écriture à structure stratifiée grâce à une résistance de chauffage (15) sous forme d'un méandre de chauffage obtenu à partir de l'une des deux couches minces électroconductrices déposées, pour former le thermoconvertisseur (4) et les pistes conductives (5, 6), directement sur l'oxyde de base, dans des cavités se trouvant sur le substrat. On crée ces cavités en organisant et en regroupant les pistes conductives (5, 6), dans lesquelles sont encastrées des sections de la résistance de chauffage (15). Cette résistance de chauffage (15) fait partie d'un pont de résistances qui sert de source de chaleur et en même temps de détecteur de température, sur la base de sa résistance électrique.

Claims (12)

  1. Dispositif pour réchauffer l'encre dans une tête d'écriture, construite selon une technique de stratification, d'un dispositif d'impression à encre, ayant les caractéristiques suivantes :
    a) une pluralité d'éléments transducteurs électrothermiques (4) agencés dans les canaux d'encre sont excités par l'intermédiaire de liaisons électriques individuelles, réalisées en tant que pistes conductrices (5,6),
    b) les éléments transducteurs électrothermiques (4) et les pistes conductrices (5,6) sont créés dans un plan de métallisation unique sur un substrat (2),
    c) à chaque fois, un certain nombre de pistes conductrices (5,6) forment des groupes séparés les uns des autres par des espaces intermédiaires,
    d) dans ces espaces intermédiaires, sont agencés, dans le premier plan de métallisation, des tronçons d'une résistance thermique à grande surface (15), tronçons qui sont électriquement reliés les uns aux autres,
    e) les tronçons de la résistance thermique (15) et les pistes conductrices (5,6) sont guidés sur une zone de bord de la tête d'écriture et le contact y est établi, et
    f) les éléments transducteurs électrothermiques (4), les pistes conductrices (5,6), et la résistance chauffante (15) sont recouverts en commun par un corps isolant (7).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que les tronçons individuels de la résistance chauffante (15) présentent une structure en forme de méandres.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que la résistance chauffante (15) est constituée d'un matériau ayant une forte dépendance à la température de la résistance électrique, et en ce que la résistance chauffante (15) sert de source de chaleur et en même temps de capteur de température.
  4. Dispositif selon la revendication 1,
    caractérisé en ce que la résistance chauffante est montée dans une branche d'un circuit à pont pour le chauffage et la mesure de la température, un signal de température Δφ(T) pouvant être prélevé sur la diagonale du pont et, également, les résistances restantes du pont étant intégrées dans le premier plan de métallisation.
  5. Dispositif selon la revendication 1,
    caractérisé en ce qu'au moins une des résistances du pont est utilisée pour le chauffage et au moins une des résistances du pont pour la mesure de la température.
  6. Dispositif selon la revendication 4,
    caractérisé en ce que le pont de mesure est parcouru par le courant de chauffage dans son ensemble (IH), et le signal de température d'au moins une branche du pont est exploité.
  7. Dispositif selon la revendication 4,
    caractérisé en ce que le pont de mesure est parcouru par un courant de mesure (IM) petit par rapport au courant de chauffage (IH), seule la résistance de chauffage (15) étant alimentée en courant pour le chauffage.
  8. Dispositif selon la revendication 1,
    caractérisé en ce que, pour la mesure de la température de chauffage, un capteur de température à couche mince séparé, intégré dans le premier plan de métallisation, est utilisé.
  9. Dispositif selon la revendication 1,
    caractérisé en ce que, pour la mesure de la température de chauffage, un capteur de température discret, séparé est utilisé.
  10. Dispositif selon la revendication 1,
    caractérisé en ce qu'un comparateur analogique (K) sert à l'exploitation du signal de température Δφ(T), dont la sortie commande l'alimentation en tension (UB) pour le pont de mesure par l'intermédiaire d'un commutateur électronique (ST).
  11. Dispositif selon la revendication 4,
    caractérisé en ce que, pour le réglage de la température, des circuits de réglage à deux positions à cycle externe (S) sont utilisés, lesquels alimentent, pendant une demi-période du cycle (S), le pont de mesure par le courant de mesure (IM), transmettent le signal de température Δ φ (T) prélevé sur la diagonale du pont à un comparateur (IC1) pour l'exploitation, dont le signal de sortie est stocké dans une mémoire (IC2,IC3) et, pendant la demi-période suivante du cycle (S), de façon correspondant aux informations stockées dans la mémoire, la résistance chauffante (15) est alimentée en courant ou non.
  12. Dispositif selon la revendication 11,
    caractérisé en ce que la mémoire (IC2,IC3) est réalisée en tant que bascule bistable.
EP90900163A 1988-12-14 1989-12-04 Dispositif servant a chauffer l'encre dans la tete d'ecriture d'une imprimante a encre Expired - Lifetime EP0479784B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP88120858 1988-12-14
EP88120858 1988-12-14

Publications (2)

Publication Number Publication Date
EP0479784A1 EP0479784A1 (fr) 1992-04-15
EP0479784B1 true EP0479784B1 (fr) 1993-07-28

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ID=8199663

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EP90900163A Expired - Lifetime EP0479784B1 (fr) 1988-12-14 1989-12-04 Dispositif servant a chauffer l'encre dans la tete d'ecriture d'une imprimante a encre

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Country Link
US (1) US5208611A (fr)
EP (1) EP0479784B1 (fr)
WO (1) WO1990006852A1 (fr)

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JPH11198375A (ja) * 1998-01-12 1999-07-27 Canon Inc インクジェット記録ヘッドおよび記録装置
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Also Published As

Publication number Publication date
WO1990006852A1 (fr) 1990-06-28
EP0479784A1 (fr) 1992-04-15
US5208611A (en) 1993-05-04

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