WO1990010541A1 - Process for varying the droplet size in ink printers - Google Patents

Process for varying the droplet size in ink printers

Info

Publication number
WO1990010541A1
WO1990010541A1 PCT/EP1990/000150 EP9000150W WO9010541A1 WO 1990010541 A1 WO1990010541 A1 WO 1990010541A1 EP 9000150 W EP9000150 W EP 9000150W WO 9010541 A1 WO9010541 A1 WO 9010541A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
ink
heating
pulse
vi
time
Prior art date
Application number
PCT/EP1990/000150
Other languages
German (de)
French (fr)
Inventor
Josef Pöppel
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/015Ink jet characterised by the jet generation process
    • B41J2/04Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04528Control methods or devices therefor, e.g. driver circuits, control circuits aiming at warming up the head
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/015Ink jet characterised by the jet generation process
    • B41J2/04Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04563Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/015Ink jet characterised by the jet generation process
    • B41J2/04Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/0458Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on heating elements forming bubbles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/015Ink jet characterised by the jet generation process
    • B41J2/04Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04598Pre-pulse
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/21Ink jet for multi-colour printing
    • B41J2/2121Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2128Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation

Abstract

Ink droplets of varying size are generated in an ink printer operating on the thermal converter principle by dividing the heating cycle into several partial cycles. By means of a number of preheating pulses (VI), the duration and timing of which varies, a temperature level is obtained in a given volume of the fluid ink but the evaporation of the ink is not yet triggered. It is only the final heating phase (heating pulse HI) that sets off the formation of bubbles and hence the ejection of a droplet. Depending on the timing and duration of the preheating stages, larger and smaller droplets are thus produced and greater efficiency and a more stable jet are achieved than with a single heating cycle.

Description

einrichtuπgen method of varying the droplet size in Tintendruck-

The invention relates to a method of varying the droplet size in ink printing devices in accordance with the Ober¬ clause of patent claim 1.

In ink printing devices, which operate on the Thermalwandler- principle (bubble-jet), and are described, for example, in German Offenlegungsschrift 30 12 9A6, the ink print heads have a plurality of Einzeldüseπ from which under the action of an electronic control defined individual droplets to be ejected. Each nozzle is connected to an ink channel, in which by means of an actuator pressure waves generated in the ink liquid. The method for building up pressure in the ink liquid be¬ rests on the generation ikrobläschen smaller. Under each ink passage, an electrothermal Wandlerele¬ is located in a certain distance from the outlet nozzle as an actuator element (heater). the immediately overlying ink liquid is superheated in a thin layer by momentarily energizing a die¬ ser transducer elements. In the subsequent evaporation of the vapor bubble draws its evaporation energy almost exclusively from the previously superheated liquid layers. The high internal pressure of the bubble causes expansion which causes an ejection of the Tintenflüssig¬ contained in the corresponding ink channel ness through the nozzle. In addition to fluid mechanical input flows that are given by the channel and nozzle geometry, the drop size is also determined by the volume of superheated ink liquid and the temperature thereof.

Are with such ink printing devices fonts of different writing qualities, for example, fonts in a so-called. Draft quality (Draft Quality DQ) and in a so-called. Calligraphy (near letter quality NLQ) are generated, so it is advantageous to ink droplets of different sizes and therefore different droplet volumes to produce. Thus, on the one hand an improved Schriftquali¬ ty (coverage) at a high printing speed and on the other hand, droplets decreased resolution due to larger Tinten¬, for example, in draft mode possible.

Furthermore, such ink printing devices are used as output devices for graphics, which requires that so-called. Gray or color levels must be represented. In this case, a monochrome or a multicolor display can be provided in both cases. In particular, there by generating ink droplets of different sizes for color printing, the ability to avoid over-saturation of the paper with solvents and Druck¬ Grau¬ represent multiple stages by a smaller grid that the Auf¬ solution significantly improved.

The generation of different drop sizes, for example for the reproduction of half-tones, encountered in the operation of the Heizele¬ mentes with a single heating pulse to problems due to unstable droplet formation, and significant impairment of the maximum continuous injection frequency.

For generating ink droplets of different size, it is 0,203,534 known from EP-AI, at a ink writing device with piezoelectric transducer elements, each associated with the ink channels of the recording head, these pulses with an adjustable number of Ansteuerim- to control. The repetition frequency of the drive pulses is abge¬ to the resonant frequency of the ink channel is right and the drive pulses following time such Open to each other that a be¬ by subsequent drive pulses interwoven discharge a small amount of ink from the Austritts¬ opening of the ink channel in each case before the separation of the by the first drive pulse caused ink droplet from the outlet opening occurs.

From EP-0124190 Bl discloses an apparatus and a procedural for generating a N-Tongrauskala means of a thermal ink jet printer is known in which the Grau¬ tones are obtained by repeated spraying of drops. For this purpose, the desired number of pulses is set in a pulse packet only which is needed to create a dot of a particular shading, and then wait for the length of a blanking interval after transmission of the previous packet to the thermal ink jet printer. Subsequently, a packet having the desired number of pulses and a pulse repetition rate is generated which is greater than the reciprocal of the given period of time until breakage of the droplet on the ink-jet printer and this packet to the Tinten¬ jet printer.

When creating a variable dot size with the aid of such multiple drops are ejected as a jet with nodes in quick succession by several Ver¬ dampfungsvorgänge is regarded as disadvantageous that, by the multiple Ver¬ evaporation long cool-down due to the al- transducer elements in the Ther occurring high residual heat is required. This limits the achievable injection frequency er¬ considerably.

The invention is based on the object for a Tinten¬ of the type mentioned measures for the control of the ink droplet volumes printing means indicate that produces at a high efficiency in a simple manner halftone or gray or color levels of individual droplets unterschied¬ Licher size.

This object is solved according to the features indicated in the characterizing part of patent claim 1. Vorteil¬ refinements are characterized characterized in the Uπteransprüchen. By dividing the heating into several Teil¬ processes a wide range of variation of the method deposited volume and ejected drop can be achieved. With the help of a number of preheat that varies in duration and time spacing, although a temperature level is produced in a given volume of the ink liquid, but still been no evaporation. It was not until the last heating phase initiates the formation of bubbles and the ejection of a droplet. Depending can be generated as large and small drops of the time interval between the preheat and their duration and it can be compared to a single heating process, a higher efficiency and a more stable jetting reach.

To explain the invention is described below on the

Figures of the drawings. In detail

1 shows in highly simplified diagram showing a block circuit diagram of an ink jet print device for generating ink droplets of different sizes and

2 shows functional relationships between the Geschwindig¬ ness of the ejected ink droplet and the time interval between a preheat and the triggering Heizim¬ pulse.

means a Tintendruck¬ not shown in Figure 1 in detail, the functions according to the thermal converter principle, contains an ink print head with a TDK the number of nozzles corresponding number of heating elements RH. The Tintendruck- Kopf TDK is moved gers via a not shown mechanism in the writing operation line by line along a Aufzeichnungsträ¬ and depending -the from a data source D for example, be a computer can- controlled by a central controller ZS an¬. The central control ZS is constructed in a conventional manner, and controls the individual heating elements to RH by delivering control signals I. In addition, it controls the movement of the printer carriage and the paper feed motor control over the MS. A device TU for monitoring the liquid ink is also connected to the central control ZS tion performed.

According to the invention uses a drive signal I for the heating elements RH in the ink print head TDK for ejecting an ink droplet from the nozzles of at least one pre-heating pulse VI and a triggering heating pulse HI together, wherein the representation of Figure 1 shows a single Vorheiz¬ pulse VI. This preheat VI follows after a time delay t of about 6 microseconds a triggering pulse heating HI

By such a pre-heating of the heating elements by means of the RH preheat VI drop mass of ink droplet to can be changed easily. The preheat phase is adjusted so that no evaporation of the ink liquid enters above the heater RH. The Hauptheizphase then solves the evaporation Ver¬ and the drop off.

2 shows the dependence of some characteristic quantities of a ausgestoßeπen ink droplet is the time distance t a preheat VI and the triggering heating pulse shown HI. In this case, the time interval t in microseconds and on the ordinate, the abscissa represents the Ge speed of the jet tip of the ink jet, in the following disadvantages as tip speed v in m / s is applied. From the drawn curve it is seen that initially, with increasing delay time t VI and HI heating pulse triggering v to a point Pl in the graph relatively sharply increases between the pre-heat pulse Spitzen¬ speed while increasing ink jet composition. If the Hauptheizphase opposite the Vor¬ heating phase is further delayed, so both the beam mass m as well as the tip speed v lang¬ sam up to a designated point on the graph with P2 decreases. For even larger delay times t (t> 14 microseconds) then take the so achievable values ​​for the peak velocity v and the beam mass sharply. Upon controlling the heating elements RH without pre-heating

VI (t = 0, point PO in the diagram) is ejected in accordance with the curve in Figure 2, an ink droplet having a mass m of 1,8x10 -10 kg. The top speed v is in this case

12 m / s and the maximum duration of injection frequency is at f = 2.5 kHz.

At a delay time t = 4 microseconds (point Pl in the diagram) between preheat VI and triggering heating pulse HI is at a constant duration of injection frequency f = 2.5 kHz, a peak velocity v = 15.4 m / s and a drop mass m = l, 8xl0 ~ kg reached. The achievable values ​​for the peak velocity v and the jet mass at a delay time t of 17 microseconds

(Point P3) are 3, 6 m / s and at 0,6x10 kg and are therefore suitable for creating relatively small dots on the recording medium. is referred to with the device without pre-heating pulse VI (t = 0) achievable efficiency with so = results with a pre-heat pulse VI and a delay time t 4 microseconds (point Pl) is twice as high efficiency 2 • b. The efficiencies are kinetic than the ratios of each expended for droplet ejection energy to

EEnneerrggiie Ekin - ~ J2ü v v2 of the ejected ink droplet ned Defi-.

The foregoing is based on an inkjet education with the use of a pre-heating followed by main heating. The thereby attainable improvement of the parameters peak velocity v, Strahl¬ mass and efficiency •? can also be achieved by a plurality of preheating pulses, wherein a plurality Vorheiz¬ phases in addition effective for improving the beam shape and a more stable jet formation. In addition, any possible residual bubbles act not in operation with multiple preheating pulses negatively to the Spritz¬ behavior of the ink print head. Moreover, it is possible not only to provide a plurality of preheating pulses VI, but also the distances between themselves and the amplitude of the individual preheat VI ieren to vari¬ such so that only the ink liquid raised to a certain temperature level and also only a aus¬ solved main heat HI the bubble formation is initiated.

In addition, the magnification effect of the drop mass can be compensated, which results from a reduction in the ink viscosity at an elevated printhead temperature. This allows a high quality of expression, especially in the reproduction of images with gray or color levels.

For this purpose, a temperature sensor TS is arranged on the ink printing head TDK in the immediate vicinity of an ink reservoir, not shown here, which detects the temperature of the ink print head TDK. Because of the geographical proximity and therefore the intimate thermal coupling of the sensor TS may Temperatur¬ liquid to the located in the ink reservoir Tinten¬ the detected temperature of the head Tintendruck- be used as a measure of the temperature of the ink liquid. Since the viscosity of the ink liquid is temperature dependent, represents the signal S of the Tempera¬ tursensors TS is a measure of the viscosity of the Tintenflüssig¬ ness is. Can through a known evaluation of Sig- Nals S in the Zentralsteueruπg then the number, duration and the time intervals of pulses Vorheiz¬ as well as the time interval t of the last Vor¬ heat signal VI and the triggering main heating pulse are set.

Claims

claims
1. A method of generating ink droplets unterschied¬ Licher size in a arbei- according to the thermal converter principle Tenden ink printing device in which in ink channels of an ink print head (TDK) a plurality of individually pulsed controllable heating elements (RH) liquid a Tinten¬ heat character-dependent locally and thereby ejecting from the specific volume of ink droplets as the ink channels final outlet nozzles dadurchgekennzei ch net, that the heating process is divided into at least a preheating (preheating pulse VI) and the evaporation of the ink liquid triggering Hauptheizphase (heating pulse HI).
2. The method of claim 1, dadurchgekenn ¬ characterized in that the number and duration of the Vorheiz¬ phases (pre-heat VI) can be changed.
3. The method according to claim 1 and 2, characterized in that the time intervals between the individual preheating pulses (VI) are each changed.
4. The method of claim 1, dadurchgekenn ¬ characterized in that the time interval (t) between the last pre-heating pulse (VI) and the triggering main heat pulse (HI) is changed.
5. The method of claim 1, dadurchgekenn ¬ characterized in that the temperature of the ink fluid is determined and the number and / or the duration of preheat in dependence on this temperature (VI) is changed.
6. The method according to claim 1, characterized in that in dependence of the temperature of the ink liquid, the time intervals between the individual preheating pulses (VI) and / or the time interval between the last pre-heating pulse and the triggering pulse Hauptheiz¬ (HI) can be changed.
PCT/EP1990/000150 1989-03-14 1990-01-26 Process for varying the droplet size in ink printers WO1990010541A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP89104480.2 1989-03-14
EP89104480 1989-03-14

Publications (1)

Publication Number Publication Date
WO1990010541A1 true true WO1990010541A1 (en) 1990-09-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526233A2 (en) * 1991-08-01 1993-02-03 Canon Kabushiki Kaisha Ink jet recording apparatus
EP0558221A2 (en) * 1992-02-24 1993-09-01 Xerox Corporation Electronic spot size control in a thermal ink jet printer
EP0564252A2 (en) * 1992-03-31 1993-10-06 Canon Kabushiki Kaisha Ink jet recording method and apparatus
EP0600648A2 (en) * 1992-11-30 1994-06-08 Hewlett-Packard Company Method and apparatus for the control of thermal ink jet printers
EP0694405A3 (en) * 1991-01-18 1996-04-03 Canon Kk Ink jet recording method and apparatus using thermal energy
EP0710562A1 (en) * 1994-11-07 1996-05-08 Canon Aptex Inc. Printer
US5673069A (en) * 1991-05-01 1997-09-30 Hewlett-Packard Company Method and apparatus for reducing the size of drops ejected from a thermal ink jet printhead
EP0867286A2 (en) * 1997-03-25 1998-09-30 Lexmark International, Inc. Ink jet printer and method of printing
US5861895A (en) * 1991-01-09 1999-01-19 Canon Kabushiki Kaisha Ink jet recording method and apparatus controlling driving signals in accordance with head temperature
US6328407B1 (en) 1999-01-19 2001-12-11 Xerox Corporation Method and apparatus of prewarming a printhead using prepulses

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490728A (en) * 1981-08-14 1984-12-25 Hewlett-Packard Company Thermal ink jet printer
US4563689A (en) * 1983-02-05 1986-01-07 Konishiroku Photo Industry Co., Ltd. Method for ink-jet recording and apparatus therefor
US4746937A (en) * 1985-06-10 1988-05-24 Ing. C. Olivetti & C., S.P.A. Control apparatus for an on-demand ink jet printing element
EP0271905A2 (en) * 1986-12-17 1988-06-22 Canon Kabushiki Kaisha Ink jet recording method and ink jet recording apparatus utilizing the same
EP0354982A1 (en) * 1988-06-14 1990-02-21 Hewlett-Packard Company A process for producing successive droplets of ink of different sizes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490728A (en) * 1981-08-14 1984-12-25 Hewlett-Packard Company Thermal ink jet printer
US4563689A (en) * 1983-02-05 1986-01-07 Konishiroku Photo Industry Co., Ltd. Method for ink-jet recording and apparatus therefor
US4746937A (en) * 1985-06-10 1988-05-24 Ing. C. Olivetti & C., S.P.A. Control apparatus for an on-demand ink jet printing element
EP0271905A2 (en) * 1986-12-17 1988-06-22 Canon Kabushiki Kaisha Ink jet recording method and ink jet recording apparatus utilizing the same
EP0354982A1 (en) * 1988-06-14 1990-02-21 Hewlett-Packard Company A process for producing successive droplets of ink of different sizes

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5861895A (en) * 1991-01-09 1999-01-19 Canon Kabushiki Kaisha Ink jet recording method and apparatus controlling driving signals in accordance with head temperature
US6310636B1 (en) 1991-01-18 2001-10-30 Canon Kabushiki Kaisha Ink jet recording method and apparatus for driving recording head based on head temperature
US6116710A (en) * 1991-01-18 2000-09-12 Canon Kabushiki Kaisha Ink jet recording method and apparatus using thermal energy
EP0694406A3 (en) * 1991-01-18 1996-04-03 Canon Kk Ink jet recording method and apparatus using thermal energy
EP0686506A3 (en) * 1991-01-18 1996-04-03 Canon Kk Ink jet recording method and apparatus using thermal energy
EP0694405A3 (en) * 1991-01-18 1996-04-03 Canon Kk Ink jet recording method and apparatus using thermal energy
US6457794B1 (en) 1991-01-18 2002-10-01 Canon Kabushiki Kaisha Ink jet recording method and apparatus for controlling recording signal parameters
US5894314A (en) * 1991-01-18 1999-04-13 Canon Kabushiki Kaisha Ink jet recording apparatus using thermal energy
US5673069A (en) * 1991-05-01 1997-09-30 Hewlett-Packard Company Method and apparatus for reducing the size of drops ejected from a thermal ink jet printhead
EP0526233A3 (en) * 1991-08-01 1993-06-16 Canon Kabushiki Kaisha Ink jet recording apparatus
US5488398A (en) * 1991-08-01 1996-01-30 Canon Kabushiki Kaisha Ink jet recording apparatus capable of emphasizing the density of black
EP0526233A2 (en) * 1991-08-01 1993-02-03 Canon Kabushiki Kaisha Ink jet recording apparatus
EP0558221A2 (en) * 1992-02-24 1993-09-01 Xerox Corporation Electronic spot size control in a thermal ink jet printer
EP0558221A3 (en) * 1992-02-24 1993-12-22 Xerox Corp Electronic spot size control in a thermal ink jet printer
US6130685A (en) * 1992-03-31 2000-10-10 Canon Kabushiki Kaisha Method for recording an image with multiple scannings of a recording head having groups of nozzles
EP0564252A3 (en) * 1992-03-31 1994-04-27 Canon Kk
EP0564252A2 (en) * 1992-03-31 1993-10-06 Canon Kabushiki Kaisha Ink jet recording method and apparatus
US5633663A (en) * 1992-03-31 1997-05-27 Canon Kabushiki Kaisha Ink jet recording method and apparatus
EP0600648A2 (en) * 1992-11-30 1994-06-08 Hewlett-Packard Company Method and apparatus for the control of thermal ink jet printers
EP0600648A3 (en) * 1992-11-30 1995-01-04 Hewlett Packard Co Method and apparatus for the control of thermal ink jet printers.
US5969730A (en) * 1994-11-07 1999-10-19 Canon Aptex Inc. Printer
EP0710562A1 (en) * 1994-11-07 1996-05-08 Canon Aptex Inc. Printer
EP0867286A2 (en) * 1997-03-25 1998-09-30 Lexmark International, Inc. Ink jet printer and method of printing
US6296350B1 (en) 1997-03-25 2001-10-02 Lexmark International, Inc. Ink jet printer having driver circuit for generating warming and firing pulses for heating elements
EP0867286A3 (en) * 1997-03-25 2000-03-29 Lexmark International, Inc. Ink jet printer and method of printing
EP1514687A3 (en) * 1997-03-25 2006-04-05 Lexmark International, Inc. Ink jet printer and method of printing
US6328407B1 (en) 1999-01-19 2001-12-11 Xerox Corporation Method and apparatus of prewarming a printhead using prepulses

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