EP1859941B1 - Procédé pour obtenir une image, et imprimante à jet d'encre pour effectuer ce procédé - Google Patents

Procédé pour obtenir une image, et imprimante à jet d'encre pour effectuer ce procédé Download PDF

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Publication number
EP1859941B1
EP1859941B1 EP20070107786 EP07107786A EP1859941B1 EP 1859941 B1 EP1859941 B1 EP 1859941B1 EP 20070107786 EP20070107786 EP 20070107786 EP 07107786 A EP07107786 A EP 07107786A EP 1859941 B1 EP1859941 B1 EP 1859941B1
Authority
EP
European Patent Office
Prior art keywords
ink
droplet
chamber
transducer
speed
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.)
Not-in-force
Application number
EP20070107786
Other languages
German (de)
English (en)
Other versions
EP1859941A1 (fr
Inventor
Johannes M.M. Simons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Netherlands BV
Original Assignee
Oce Technologies BV
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
Application filed by Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP20070107786 priority Critical patent/EP1859941B1/fr
Publication of EP1859941A1 publication Critical patent/EP1859941A1/fr
Application granted granted Critical
Publication of EP1859941B1 publication Critical patent/EP1859941B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B41J2/04588—Control methods or devices therefor, e.g. driver circuits, control circuits using a specific waveform
    • 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
    • B41J2/04526—Control methods or devices therefor, e.g. driver circuits, control circuits controlling trajectory
    • 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
    • B41J2/04551—Control methods or devices therefor, e.g. driver circuits, control circuits using several operating modes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14354—Sensor in each pressure chamber

Definitions

  • an electrical pulse can be applied to the transducer (the pulse being any electrical signal that can be used to energise the transducer), whereupon the transducer (e.g. of the electro-mechanical or electrothermal type) creates a pressure wave in the ink chamber.
  • This pressure wave will force a small volume of ink to be expelled from the ink ejection site.
  • all kinds of pressure waves can be induced. This way, the size and speed of the ink jet droplets can be controlled, albeit that the physical constraints of the print head determine the maximum and minimum values for size and speed.
  • the accuracy of ink droplet placement should be very high (typically within a few percent of droplet size). This way, for all droplets that are intended to make part of the image a desired accuracy of droplet placement will be determined.
  • the accuracy on its turn corresponds to a speed at which the droplet should be jetted from the ink ejection site. High accuracy corresponds to a high droplet speed, whereas a low accuracy corresponds to a low droplet speed. This way, it is clear for all droplets at which speed they should be jetted.
  • Attaining the right speed means providing a pulse to the transducer that is designed to provide that speed. It is generally known in the art that by tuning and adapting pulses different droplet speeds can be achieved. Thus, for each droplet a dedicated pulse is generated, which pulse, when applied to the transducer corresponding to that droplet, should provide a pressure wave in the ink chamber such that the ink droplet is ejected from the chamber essentially at the said speed to obtain the desired accuracy of droplet placement.
  • the droplets for which placement accuracy is less important with respect to print quality are jetted at low to moderate ink ejection speeds (i.e. at speeds significantly lower than the maximum attainable ejection speed).
  • ink ejection speeds i.e. at speeds significantly lower than the maximum attainable ejection speed.
  • the invention can also be applied for images that form part of a larger image. For example, for some applications it is adequate that the invention is only applied for a sub-image of a complete image to be formed. For 3D modelling for example, it is typically sufficient to apply the present invention only for the sub-images that form the outermost parts of the 3D image. The inner parts are not visible, so image quality is often hardly important for those parts. In full-colour printing, one could apply the invention only for the most prominent colour sub-images, for example the Black and Magenta images.
  • Print quality is less of an issue for the Yellow sub-image.
  • the present invention to some parts of an image, for example the centre or lower parts of an image, those parts then correspond to an "image" as defined in the appended claims.
  • the invention can be applied for any image, no matter how this image is defined, that is part of a larger image.
  • the transducer is an electro-mechanical transducer which is operatively connected to the ink chamber, which transducer deforms on application of the said pulse and thereupon induces the pressure wave.
  • a transducer e.g. a piezoelectric or electrostatic transducer, which upon actuation induces a sudden volume-change of the chamber.
  • an electrical pulse is applied such that the chamber volume firstly increase which lead to "over-filling" of the chamber, whereafter the chamber is brought back to its equilibrium dimensions.
  • this latter signal is measured in order to establish the effect of the droplet ejection step in the ink chamber.
  • a transducer is used which generates an electrical signal upon its deformation, e.g. a piezoelectric transducer.
  • the pressure waves which are induced in the ink, on their turn will deform the electro-mechanical transducer.
  • the transducer will then generate an electrical signal that corresponds to the pressure waves.
  • information can be gathered about the physical effect the droplet ejection step had in the chamber. It is noted that in general it is known (e.g. from US 6,682,162 ; US 6,926,388 and US 6,910,751 ) that by analysing such a signal, information about the circumstances in an ink chamber can be gathered. It has hitherto however not been known that this information can be advantageously used to tune the method according to the present invention. If for example it is established that the effect of the actuation was a droplet speed that diverted too much of the intended one, it is possible to alter the actuation for a next droplet ejection.
  • the accuracy for each droplet is determined according to the type of image information which is to be formed using the droplet.
  • the accuracy of droplet placement needed to achieve an adequate print quality can be established in dependence of the type of image information. For example, it is generally known for text characters what kind of droplet misplacement is acceptable for certain applications. The same is true for full colour photographs (where typically the droplet placement accuracy needed is somewhat lower than for text). For applications such as printing masks for nano imprint lithography or the fabrication of printed circuit boards directly, more stringent requirements will be in place. This all depends on the desired accuracy of the ultimate printed substrate.
  • FIG. 1 is a diagram showing an inkjet printer.
  • the printer comprises a roller 1 used to support a receiving medium 2 (receiving substrate), such as a sheet of paper or a transparency, and move it along the carriage 3.
  • This carriage comprises a carrier 5 to which four printheads 4a, 4b, 4c and 4d have been fitted.
  • Each printhead contains its own colour, in this case cyan (C), magenta (M), yellow (Y) and black (K) respectively.
  • the printheads are heated using heating elements 9, which have been fitted to the rear of each printhead 4 and to the carrier 5.
  • the temperature of the printheads is maintained at the correct level by application of a central controller arrangement 10 (controller).
  • the roller 1 may rotate around its own axis as indicated by arrow A.
  • the receiving medium may be moved in the sub-scanning direction (often referred to as the X direction) relative to the carrier 5, and therefore also relative to the printheads 4.
  • the carriage 3 may be moved in reciprocation using suitable drive mechanisms (not shown) in a direction indicated by double arrow B, parallel to roller 1.
  • the carrier 5 is moved across the guide rods 6 and 7. This direction is often referred to as the main scanning direction or Y direction. In this manner, the receiving medium may be fully scanned by the printheads 4.
  • Each ink chamber comprises a piezo-electric transducer (not shown) that may generate a pressure wave in the ink chamber so that an ink drop is ejected from the nozzle of the associated chamber in the direction of the receiving medium. This droplet then travels through the air in the direction of the receiving medium 2.
  • the exact location of placement of the droplet on the receiving medium depends i.a. on the speed of the droplet. Since the speed aimed at is known beforehand, it can be calculated when each transducers should be actuated in order for a droplet to arrive at the intended location.
  • the transducers are actuated image-wise via an associated electrical drive circuit (not shown) by application of the central control unit 10. In this manner, an image built up of ink drops may be formed on receiving medium 2.
  • this receiving medium is printed using such a printer where ink drops are ejected from ink chambers
  • this receiving medium is imaginarily split into fixed locations that form a regular field of pixel rows and pixel columns.
  • the pixel rows are perpendicular to the pixel columns.
  • the individual locations thus produced may each be provided with one or more ink drops.
  • the number of locations per unit of length in the directions parallel to the pixel rows and pixel columns is called the resolution of the printed image, for example indicated as 400x600 d.p.i. ("dots per inch").
  • the transducer first bends away from the chamber, thus sucking in ink via an inlet opening (not shown), after which the transducer is moved back into its initial position. This also produces a pressure wave in the chamber. If the pressure wave is strong enough, an ink drop is ejected from exit opening 8. After expiry of the ink drop ejection process, the pressure wave, or a part thereof, is still present in the chamber, after which the pressure wave will damp fully over time. This pressure wave, in turn, results in a deformation of transducer 16, which then generates an electric signal. This signal depends on all the parameters that influence the generation and the damping of the pressure wave.
  • FIG 3 a relationship between the electrical pulse and pressure wave induced is shown.
  • electrical pulse 40 is shown, which pulse is schematically represented as a varying voltage V during a time t.
  • V voltage
  • a pressure wave 50 is induced in the ink in the corresponding ink chamber.
  • This pressure wave is schematically represented as a varying pressure P during a time t.
  • Dot 51 indicates the moment when an ink droplet is actually ejected from the nozzle of the ink chamber. This droplet has a speed of 6 meters per second, which speed corresponds to the electrical pulse 40 for this ink chamber.
  • electrical pulse 42 is shown, which pulse is also schematically represented as a varying voltage V during a time t.
  • V voltage
  • a pressure wave 52 is induced in the ink in the corresponding ink chamber.
  • This pressure wave is schematically represented as a varying pressure P during a time t. It can be seen that this pressure wave differs substantially from wave 50, i.a. in that the amplitude and frequency are higher.
  • Dot 53 indicates the moment when an ink droplet is actually ejected from the nozzle of the ink chamber. This droplet has a speed of 8 m/sec, corresponding to the electrical pulse 42 for this ink chamber.
  • Figure 4 shows a relationship between the accuracy of ink droplet placement and the ink droplet speed.
  • the first column shows a relative indication of the ink droplet placement accuracy, going from “Very high”, through “High”, “Moderate” and “low” to “very Low”.
  • the dot placement accuracy corresponding to these indications is depicted in the second column by giving the droplet placement deviation as a percentage relative to the ink dot size after hitting the receiving substrate.
  • an ink dot has a size of 10 ⁇ m in diameter.
  • a very high accuracy in this particular example thus corresponds to an ink droplet placement deviation of 5% of 10 ⁇ m which equals 0.5 ⁇ m.
  • a very low accuracy in this example corresponds to an ink droplet placement deviation of 1000% of 10 ⁇ m which equals 100 ⁇ m.
  • Figure 5 shows a relationship between the reliability of an ink droplet ejection process and the ink droplet ejection speed.
  • the reliability T for ink droplet ejection process is given, i.e. as an average value for all the ink chambers of an ink jet print head.
  • a reliability of 100% means that ink droplet forming process will always be successful.
  • a reliability of e.g. 98% means that on average two out of hundred intended droplets will not be adequately be formed (i.e. will not be formed in a way that they will hit the receiving substrate).
  • Horizontally the ink droplet ejection speed is given. For this particular print head it can be seen that with speeds up to 3 m/sec, the reliability is virtually 100%.
  • the reliability starts to decrease noticably, but up to 6 m/sec this will in general not lead to any disturbing print artefacts for regular ink jet prints.
  • the reliability has decreased to approximately 99%.
  • This value in this example is regarded as a limit for good ink jet printing. Above that speed, the reliability is so low that print artefacts are becoming disturbingly visible.
  • the actual relationship between the reliability and the ink droplet speed depends strongly on the type of ink jet head. This relationship has to be established for each inkjet head. In practice this can be done by varying the ink droplet speed and measuring the number of actual droplet ejections relative to the intended number of ink droplet ejections. Also, which reliability is still acceptable also largely depends on the application. For example, for text printing, less stringent demands will generally apply as compared to CAD drawings.
  • Figure 6 shows an example of a substrate to be printed with an ink jet printer according to the invention.
  • the substrate is divided into parts intended for various types of image information.
  • Substrate 2 is a transparent plastic medium that is being used as a mask in the prochamberion of printed circuit boards.
  • Sub-part 60 is intended for an image that shows the title of the mask. The print quality needed for this type of image information is "Very low”.
  • Sub-part 62 is intended for an image that reflects a technical specification of the actual mask. The print quality needed for this image is "Moderate” with respect to figures in the specification and “Low” with respect to text in the specification.
  • Sub-part 64 is intended to receive the actual print mask. The print quality needed for this part of the substrate is "Very High”.
  • Sub-part 66 is intended for an image that shows the date of prochamberion of the mask and other tracking data.
  • the print quality needed for this type of image information is "low".
  • only sub-part 64 will be printed with very high droplet speeds.
  • the print quality of this part of the complete image i.e. the print quality with respect to ink droplet placement, will be very high.
  • the chances of ink droplet ejection failure are somewhat higher than for the other parts of the receiving substrate, but still low enough to guarantee an adequate image.
  • the other parts are printed with lower ink droplet ejection speeds. Note that in part 62 two different droplet speeds will be used. A moderate speed with respect to figures to be printed and a low speed with respect to text to be printed.
  • FIG. 7 is a block diagram showing the piezo-electric transducer 16, the actuation circuit (items 17, 25, 30, 16 and 18), the measuring circuit (items 16, 30, 25, 24, and 26) and control unit 33 according to one embodiment.
  • the actuation circuit comprising a pulse generator 18, and the measuring circuit, comprising an amplifier 26, are connected to transducer 16 via a common line 30.
  • the circuits are opened and closed by two-way switch 25 which can be devised as a hardware switch or as any other arrangement that electrically mimics the same effect.
  • two-way switch 25 is converted so that the actuation circuit is opened and the measuring circuit is closed.
  • the electric signal generated by the transducer is received by amplifier 26 via line 24.
  • the resulting voltage is fed via line 31 to A/D converter 32, which offers the signal to control unit 33. This is where the measured signal is analysed. This way clear information can be provided about the circumstances in the chamber during the time the pressure waves run through the chamber. In other words, information can be gathered about the physical effect the droplet ejection step had in the chamber.
  • a signal is sent to pulse generator 18 via D/A converter 34 so that a subsequent actuation pulse is modified to the current state of the chamber.
  • Control unit 33 is connected to the central control unit of the printer (not shown in this figure) via line 35, allowing information to be exchanged with the rest of the printer and/or the outside world.

Landscapes

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

Claims (5)

  1. Procédé d'obtention d'une image constituée de multiples gouttelettes d'encre placées sur une pluralité d'emplacements sur un substrat récepteur (2), en utilisant une imprimante à jet d'encre comprenant une chambre d'encre (19) comportant un site d'éjection des gouttelettes d'encre (8) et un transducteur (16) correspondant à ladite chambre, dans lequel le procédé consiste pour chacune des gouttelettes d'encre à :
    - déterminer la précision souhaitée pour le placement de la gouttelette sur le substrat, laquelle précision correspond à une vitesse à laquelle la gouttelette est éjectée de la chambre,
    - générer une impulsion électrique (40) correspondant à ladite vitesse de la gouttelette,
    - appliquer l'impulsion électrique au transducteur, afin de délivrer une onde de pression (50) dans la chambre d'encre, de manière que la gouttelette d'encre soit éjectée de la chambre à ladite vitesse.
  2. Procédé selon la revendication 1, dans lequel la chambre est sensiblement close, le site d'éjection étant une buse de ladite chambre, caractérisé en ce que le transducteur est un transducteur électromécanique opérationnellement connecté à la chambre d'encre, lequel transducteur se déforme lors de l'application de ladite impulsion, et sur ce, induit l'onde de pression.
  3. Procédé selon la revendication 2, caractérisé en ce que l'onde de pression induit à son tour une déformation du transducteur, de manière que le transducteur génère un signal électrique correspondant, et dans lequel le signal est mesuré afin d'établir l'effet produit par l'étape d'éjection de la gouttelette dans la chambre d'encre.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la précision pour chaque gouttelette est déterminée en fonction du type d'information imagée devant être formée par la gouttelette.
  5. Imprimante à jet d'encre comprenant une chambre d'encre (19) comportant un site d'éjection de gouttelette d'encre (8), un transducteur (16) correspondant à la chambre d'encre et un générateur d'impulsions (18) destiné à appliquer une impulsion électrique (40) au transducteur, afin de délivrer une onde de pression (50) dans la chambre d'encre, dans lequel l'imprimante comprend un agencement de contrôleur (10) conçu pour la mise en oeuvre par l'imprimante d'un procédé selon l'une quelconque des revendications 1 à 4.
EP20070107786 2006-05-24 2007-05-09 Procédé pour obtenir une image, et imprimante à jet d'encre pour effectuer ce procédé Not-in-force EP1859941B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20070107786 EP1859941B1 (fr) 2006-05-24 2007-05-09 Procédé pour obtenir une image, et imprimante à jet d'encre pour effectuer ce procédé

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06114501 2006-05-24
EP20070107786 EP1859941B1 (fr) 2006-05-24 2007-05-09 Procédé pour obtenir une image, et imprimante à jet d'encre pour effectuer ce procédé

Publications (2)

Publication Number Publication Date
EP1859941A1 EP1859941A1 (fr) 2007-11-28
EP1859941B1 true EP1859941B1 (fr) 2010-02-24

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Application Number Title Priority Date Filing Date
EP20070107786 Not-in-force EP1859941B1 (fr) 2006-05-24 2007-05-09 Procédé pour obtenir une image, et imprimante à jet d'encre pour effectuer ce procédé

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6276772B1 (en) * 1998-05-02 2001-08-21 Hitachi Koki Co., Ltd. Ink jet printer using piezoelectric elements with improved ink droplet impinging accuracy
JPH11334068A (ja) * 1998-05-26 1999-12-07 Brother Ind Ltd インク噴射装置
NL1021015C2 (nl) * 2002-07-05 2004-01-06 Oce Tech Bv Werkwijze voor het aansturen van een inkjet printkop, een inkjetprintkop geschikt voor het toepassen van deze werkwijze en een inkjet printer voorzien van deze printkop.

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