EP0729846B1 - Compensation d'image au moyen de marques de référence imprimées - Google Patents

Compensation d'image au moyen de marques de référence imprimées Download PDF

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Publication number
EP0729846B1
EP0729846B1 EP19960301419 EP96301419A EP0729846B1 EP 0729846 B1 EP0729846 B1 EP 0729846B1 EP 19960301419 EP19960301419 EP 19960301419 EP 96301419 A EP96301419 A EP 96301419A EP 0729846 B1 EP0729846 B1 EP 0729846B1
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EP
European Patent Office
Prior art keywords
substrate
images
printhead
subsequent
image
Prior art date
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Expired - Lifetime
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EP19960301419
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German (de)
English (en)
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EP0729846A2 (fr
EP0729846A3 (fr
Inventor
Michael J. Piatt
Rodney J. Stadum
Peter N. Tank
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Kodak Versamark Inc
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Kodak Versamark Inc
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Publication of EP0729846A3 publication Critical patent/EP0729846A3/fr
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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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
    • B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
    • B41J11/46—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering by marks or formations on the paper being fed

Definitions

  • the present invention relates to physical alignment of printheads and control of image registration on an ink jet web press and, more particularly, to use of reference marks to resolve and correct for spatial discrepancies on subsequent images printed by a continuous ink jet printer on a web transport.
  • ink is supplied under pressure to a manifold region that distributes the ink to a plurality of orifices, typically arranged in a linear array(s).
  • the ink discharges from the orifices in filaments which break into droplet streams.
  • the approach for printing with these droplet streams is to selectively charge and deflect certain drops from their normal trajectories.
  • Graphic reproduction is accomplished by selectively charging and deflecting drops from the drop streams and depositing at least some of the drops on a print receiving medium while other of the drops strike a drop catcher device.
  • the continuous stream ink jet printing process is described, for example, in U.S. Pat. Nos. 4,255,754; 4,698,123 and 4,751,517.
  • the substrate In ink jet printing, the substrate is passed under a printhead which sprays the image forming ink onto the substrate in an imagewise fashion. Thus, the only thing which contacts the substrate is the image itself.
  • ink jet imaging While there are many similarities between ink jet imaging and conventional printing, there are several problems which are unique to ink jet imaging. For example, typical ink jet ink printing systems carry much more vehicle to the substrate than conventional imaging systems. An intermediate drying step is required between image steps to prevent the two images from mixing in the liquid state, an effect called image bleed. The additional vehicle in the imaging steps can cause the paper to stretch, contract or wrinkle. This makes the process of registering one image on top of the other much more difficult because the dimensional stability of the substrate cannot be counted on to be consistent.
  • a drop to be printed is created somewhere above the substrate. It is created with an initial velocity generally directed towards the substrate. While the drop is drifting towards the substrate, the substrate is moving under the printhead. Furthermore, the drop velocity can change with time. In a typical case, the drop is created about 2 cm above the substrate with a velocity of 1000 cm per second. Therefore, it takes 0.5 milliseconds to reach the substrate. At a substrate speed of 500 cm per second, 0.25 cm of substrate passes under the printhead while the drop is in flight. Hence, the system electronics must take account of the 0.25 cm in determining when to request the image. Thus, a problem with ink jet imaging which is uniquely different from conventional imaging is exactly determining the position of an image.
  • a complication in the exact placement of an ink jet image comes from variations in the ink jet process during operation. For example, a system variation in substrate speed of 5% creates a 0.01 cm difference in the position of the image, because of the drift time effect. If imaging is being carried out at 9,4 spots per mm (240 spots per inch), that difference would amount to well over one resolution element. That magnitude of variation must somehow be accounted for by the system electronics.
  • the present invention discloses a printing system for superimposing multiple ink jet images for the creation of color includes the capability of printing registration marks in the margin of the image.
  • the form and type of the marks are devised, in accordance with the present invention, to allow multiple applications to the problems of ink jet imaging.
  • image registration of images printed on a substrate of an ink jet web press is controlled. Registration marks are printed on the substrate, relative to the print location of the images, and then read. The registration marks are used to determine spatial discrepancies in subsequent images. Dynamic corrections correct for spatial discrepancies in subsequent images to assure good overlay of image data onto previously printed images, and static corrections correct for spatial discrepancies in alignment of subsequent printheads to each other to assure good reference of image data onto previously printed images.
  • An object of the present invention is to control image registration on an ink jet web press. It is a further object of the present invention to use reference marks printed by a continuous ink jet printer on a web transport to resolve and correct for spatial discrepancies on subsequent images. It is an advantage of the present invention that it provides for an improved printing system in which color ink jet printing can be accomplished with excellent image positioning.
  • control of image registration on an ink jet web press is facilitated through the application of reference marks printed by the imaging source and recorded by sensors that in turn control the timing and image content of subsequent printheads. More specifically, printed registration marks are used to assure proper alignment of overlaying planes of data from separate printheads that together compose a single image. Further, adjustments in image size to compensate for changes in media through the press are affected by analysis of the sensed registration marks at the downstream print stations.
  • ink jet printing In order to obtain good image quality, especially in color printing, it is desirable to be able to lay down ink from independent printheads at precise locations on the paper.
  • the printheads are physically separated one behind the other.
  • the length of paper between adjacent printheads varies from one press to another. This is a function of the particular paper path.
  • the necessity to dry the paper between applications of ink requires that the paper be routed through drying mechanisms, such as heaters, before passing into the next print station.
  • drying mechanisms such as heaters
  • This alignment problem can actually be realized as two separate, but related, problems.
  • the printheads are field replaceable parts that require frequent routine maintenance. In order to perform this maintenance, it may not be possible to hold the printhead in its exact physical location in the press. Therefore, it becomes necessary to be able to re-align the printhead to the rest of the press after such procedures.
  • the second alignment problem relates to controlling the misregistration as a result of changes in the media relative to the printheads.
  • High speed paper webs tend to move laterally to the direction of forward motion.
  • the moisture content in the paper changes dramatically with subsequent applications of ink and drying.
  • the physical dimensions of the paper may change as a result of this.
  • the printing and sensing of registration marks by the forward head or heads in the press can be used to correct for both printhead position errors and dynamic paper changes.
  • Fig. 1 illustrates a portion of an ink jet web press system 10, in accordance with the present invention.
  • a left hand image 12 is created by a first printhead 14 and printed on a substrate 16.
  • a cue mark 18 is associated with the image 12.
  • the substrate 16 travels through the system to the location of a subsequent (second) printhead 20.
  • a sensor 22 typically a focused infrared beam that is reflected off of the substrate 16, identifies the printed cue mark 18 created by the printhead 14.
  • Present day infrared sensor technology provides resolution of the printed mark within 0,0254 mm (0.001 inch). This is approximately one fourth the pixel spacing in a typical high speed web ink jet system and, therefore, is a small percentage of the total error associated with overlaying images in this system.
  • the sensor 22 output of Fig. 1 is a control signal into data system 24 of Fig. 2, providing image information to any subsequent printhead 20, 46 or any other downstream printhead.
  • the ink jet web press system 10 comprises a number of subsystems.
  • the paper transport system includes a paper feed system at one end.
  • This feed system is typically a large 1,219 m (four foot diameter) roll of continuous paper on a spindle.
  • the paper is pulled off of the spindle by a set of drive rollers that feed the paper web under an imaging head.
  • the encoder 38 of Fig. 1 is typically mounted on the feed roller shaft. It is assumed that there is no slip between the feed rollers and the paper being pulled through the system.
  • the paper is routed through a dryer to remove the moisture from the first imaging station.
  • This combination of print station and dryer is referred to as a tower. Separate towers are set back-to-back to each other. Each tower has its own set of feed rollers.
  • the substrate is a single continuous web under tension, there is typically only one encoder mounted on the first roller shaft.
  • the information from this encoder is used to determine average web speed, rather than the exact web position at each tower location. This is the whole purpose for printing cue marks.
  • the final part of the transport is the finishing station after the last tower.
  • the finishing station may be any suitable means, such as a take up reel for the roll of paper, or a device that cuts, folds, or even glues the paper exiting the last tower.
  • the ink jet system is also a portion of the ink jet web press system 10.
  • the ink jet system is the ink handling system of pumps, valves, filters, etc. and the printhead itself, along with all of the necessary control electronics to assure proper application of ink onto the substrate.
  • the ink jet web press system includes the data system 24, which is responsible for formatting and transmitting the image information to the printheads 26, which correspond to the printheads 14 and 20, and subsequent printheads, in Fig. 1.
  • Both the reference tach signal 28 and the sensor tach 30 are fed into system controller 32.
  • This controller 32 calculates the output tach rate and performs such functions as scaling up or down the input signal rates and delaying the signal for compensation for droplet flight time.
  • the processed output is fed to the data system 24 along with actual image data 34.
  • the image data is clocked out to a fluid system 36 at the processed tach rate.
  • the data passes through the fluid systems 36 to the printheads 26 for imaging.
  • Fig. 3a is a signal diagram showing the reference tach 28 for the master, or first, printhead 14, and output from an encoder 38 in Fig. 1.
  • Fig. 3b is the signal output from the sensor 22, illustrating instantaneous velocity sensed where there is no image.
  • the reference tach 28 and the local sensor tach 30 signals are input to the system controller 32, which outputs a processed tach signal 40, as shown in Fig. 3c.
  • Fig. 3a is a signal diagram showing the reference tach 28 for the master, or first, printhead 14, and output from an encoder 38 in Fig. 1.
  • Fig. 3b is the signal output from the sensor 22, illustrating instantaneous velocity sensed where there is no image.
  • the reference tach 28 and the local sensor tach 30 signals are input to the system controller 32, which outputs a processed tach signal 40, as shown in Fig. 3c.
  • a signal 42 which is a local sensor tach signal from sensor 22 indicative of paper stretch, sensed at the image 12. Knowing the reference tach indicated by Fig. 3a, the instantaneous velocity indicated by Fig. 3b, and the paper stretch indicated by Fig. 3d, a final processed tach signal 44, for assuring good reference and overlay of image data to previously printed images, can be determined, as illustrated in Fig. 3e.
  • the processed tach is set equal in period but delayed in time to the local sensor tach.
  • the processed tach may be some other multiple of the local sensor tach, but always derived from the local sensor tach.
  • the initiation of print by printhead 20 is referenced to the input signal from the sensor 22. It will be appreciated that the command to print from head 20 may be delayed in space or time from the sensor output. Other references may be incorporated herein, such as input from the encoder 38 coupled to the paper motion at printhead 14. The encoder 38 may be used to resolve paper velocity in order to accurately determine when to start the printing with printhead 20 relative to the sensor 22 response.
  • Aligning the start of print from one head on top of the print from another head is very often a requirement for processed color imaging. However, simply aligning the start of print from one head on top of the print from another head is not always sufficient for excellent image registration.
  • the paper may change physical dimensions in the web direction as a result of the web tension coupled with subsequent wetting and drying of the media as it passes through the various print stations.
  • the image data for a given printhead can be adjusted to the length of the paper if such information is made available.
  • the technique of the present invention of printing and reading cue marks can be used to resolve paper stretch, provided cue sensor feedback information is coupled with another reference signal, such as encoder 38, which is coupled to the paper movement.
  • printed cue marks 18 are in direct relationship with the encoder signal means or tach wheel 38 measuring paper movement, because the encoder is in close proximity to the imaging head 14 and directly coupled to the paper motion.
  • a plurality of cue marks 18' imaged by head 14 may comprise a plurality of equally spaced horizontal lines, as illustrated in Fig. 4. If the average velocity of the substrate 16 remains constant through the web, the relationship between the encoder 38 signal and the sensor 22 output recording the horizontal cue lines 18' will remain constant.
  • Paper stretch is a local phenomenon over the length of the image. Local paper stretch can be resolved by comparing the period of the encoder 38 signal with the period of the sensor 22 output, using any suitable means, as it reads the printed cue marks 18'.
  • the period of the reference signal 38 is an indication of the paper velocity. The relationship between this signal and the one read by sensor 22 is known if the local velocity at the position of sensor 22 is known. For example, if the instantaneous velocity at sensor 22 is 10% greater than the instantaneous velocity at printhead 14, then the period of the signal from sensor 22 will be exactly 10% less than the signal from reference sensor 38.
  • paper stretch can be determined by assuming that the paper velocity is constant or known. In areas of no print where paper stretch is typically negligible, the technique of the present invention, as described above, can be used to determine local paper velocity.
  • the period of the encoder 38 signal is compared with the period of the sensor 22 output reading the printed cue marks 18'. The relation between these periods should be the same as when the cue marks 18 were initially printed by the first printhead 14. Any variation is a measure of a change in the instantaneous velocity between the location of the encoder 38 and the sensor 22. This velocity information is valuable in determining the rate at which to print the image data from printhead 46 or printhead 20, in order to maintain good registration over the length of the image.
  • the horizontal cue lines 18' shown in Fig. 4 should appear just above the image, for example, by 50,8 mm (a couple of inches), for an instantaneous velocity measurement; and throughout the image for determination of paper stretch.
  • the sensor 22 can read the first set of cue lines and use the information to resolve the instantaneous paper velocity.
  • the following set of cue lines that are aligned with the image can be used to resolve paper stretch. After this information is recorded, the data and/or the rate of imaging can be adjusted, just prior to the start of the application of ink by the downstream head 46.
  • the printheads 14 and 46, and subsequent downstream printheads, as desired, are in direct line with each other in the direction of paper movement.
  • one means for obtaining this alignment is to use the leading printhead 14 to print a set of cue marks 18", as shown in Fig. 5. Sensors rigidly attached to subsequent printheads in the press read these marks.
  • the cue signature 18" illustrated in Fig. 5 is designed so that each parallel line is one pixel different in length to adjacent lines. All lines start along the same edge.
  • the downstream printheads are positioned across the web until the correct number of cue lines are received by the infrared sensor 22 associated with the corresponding printhead. It is not necessary to physically attach the cue sensor 22 to the individual printheads for dynamic measurements, such as paper stretch and instantaneous velocity.
  • the sensors 22 are attached to the corresponding printheads so that each sensor and printhead can be moved as a unit.
  • the sensors are attached to a printhead support that is always referenced to the array. In this way, the printheads can be removed without the sensors.
  • the printhead can be mounted on a member which can be moved in a direction substantially perpendicular to direction of substrate motion.
  • Actuator means can then be provided which are capable of slight movements of the printhead structure.
  • the actuator means are responsive to the sensor means to provide sub pixel accuracy image overlay through interpolation.
  • Fig. 5 illustrates a set of lines 18", printed by printhead 14, that vary in length by one pixel. The length of the lines is determined by the jet spacing in the array.
  • Each printhead is adjusted perpendicular to the web until each printhead in the direct line reads exactly the same portion of the pattern of lines of Fig. 5 as every other printhead in the direct line.
  • the position of sensor 22 on printhead 46 is exactly duplicated at each subsequent printhead.
  • Printhead angular alignment is also critical in achieving proper overlay of images.
  • the ink jet arrays for each printhead must be parallel to each other and substantially orthogonal to the direction of web travel.
  • the printed cue mark technique of the present invention can be used to assure this alignment. For example, consider cue marks printed by the first head in a sequence such as is illustrated in Fig. 6. Two cue marks 18a and 18b are printed from opposite ends of the array of printhead 14. Two cue sensors 22a and 22b properly aligned and attached to subsequent printhead 46, and additional downstream printheads, as desired, detect the cue marks 18a and 18b as the cue marks pass by the sensors. The angle of the downstream printheads 46 are adjusted about the z-axis, as shown in Fig. 6, until the sensors 22a and 22b read the cue marks 18a and 18b at the same instant. As will be obvious to those skilled in the art, this process can also be automated under computer control.
  • the technique of the present invention can be used to determine errors due to paper shifts at high web velocities (once the speed of the web is increased to a typical operating speed), and make appropriate corrections. If the number of cue marks read by a given printhead changes, that is an indication that the paper has moved by one pixel increment. The number of cue marks being read also indicates the direction of paper shift.
  • each printhead has more jets than are needed for printing, so there are usually extra jets at each end of the printhead.
  • the data sent to that particular printhead i.e., the printhead where the paper shift is noticed
  • the printheads can be shifted to accomplish the same.
  • the present invention provides a system and method for controlling image registration of images printed on a substrate of an ink jet web press.
  • a reference tachometer provides a first signal indicative of substrate distance and substrate speed. Registration marks are printed on the substrate, relative to the images.
  • a sensor means reads the registration marks and provide a second signal indicative of instantaneous substrate speed. The first signal and the second signal are compared to indicate instantaneous substrate speed discrepancies on subsequent images. In this manner, the registration marks are used to assure good reference and overlay of image data onto previously printed images.
  • the indicated instantaneous substrate speed discrepancies on subsequent images are corrected, such as by changing the speed at which data is sent to subsequent printheads.
  • the instantaneous substrate speed can be used to provide a third signal indicative of substrate stretch, which can be corrected for according to the present invention.
  • Substrate stretch can be corrected by changing the speed at which data is sent to subsequent printheads; or by adjusting data, thereby forcing a subsequent image to have a length equal to a previous image.
  • Static corrections can be made in the ink jet web press to assure good reference and overlay of image data onto previously printed images, by providing in-line positioning of each printhead in a direct line path.
  • In-line positioning of each printhead in a direct line path can be accomplished by printing a reference pattern on the substrate, relative to the images, running the ink jet web press at a relatively slow speed, and aligning each printhead in a direct line path until each subsequent printhead reads exactly the same portion of the reference pattern as each previous printhead.
  • a first reference mark can be printed, readable by a first sensor; and a second reference mark can be printed, readable by a second sensor.
  • Each printhead rotation can then be adjusted along an axis in a direction orthogonal to the plane of the substrate until the first sensor reads the first reference mark simultaneously with the second sensor reading the second reference mark.
  • the present invention recognizes and corrects for substrate shift discrepancies on subsequent images.
  • Substrate shift discrepancies can be corrected by varying which nozzles of each printhead receive data for printing the subsequent images.
  • Each printhead can be mounted on a member which can be moved in a direction substantially perpendicular to direction of substrate motion.
  • Actuator means can then be provided which are capable of slight movements of the printhead structure.
  • the actuator means are responsive to the sensor means to provide sub pixel accuracy image overlay through interpolation.
  • the present invention is useful in the field of ink jet printing, and has the advantage of improving image registration of an ink jet printing image.
  • the present invention has the further advantage of resolving and correcting for spatial discrepancies on subsequent images printed on downstream imaging stations.
  • the present invention is particularly advantageous for use in a color printing process.
  • the present invention can be used to automate the static alignment of printheads in a web press by interfacing the output of sensors with appropriate control electronics and actuation devices for the purpose of shifting printheads to the desired positions.

Claims (10)

  1. Procédé de commande de repérage d'images imprimées sur un support d'une presse à jet d'encre sur papier sans fin possédant une pluralité de têtes d'impression munies de buses pour éjecter de l'encre pour l'impression des images, procédé comprenant les étapes suivantes :
    la prévision d'un tachymètre de référence pour fournir un premier signal indiquant la distance du support et la vitesse du support ;
    l'impression de repères de calage sur le support, concernant les images ;
    la lecture des repères de calage ; et
    l'utilisation des repères de calage pour s'assurer un bon recouvrement des données d'image sur les images précédemment imprimées.
  2. Procédé pour la commande d'un repérage d'image selon la revendication 1, selon lequel l'étape de lecture des repères de calage comprend, de plus, les étapes suivantes :
    l'utilisation d'un moyen de capteur pour lire les repères de calage et pour fournir un second signal représentant la vitesse instantanée du support :
    la comparaison du premier signal et du second signal pour indiquer des écarts de la vitesse instantanée du support sur les images suivantes ; et
    la correction des écarts de vitesse instantanée du support pour les images suivantes en modifiant la vitesse à laquelle les données sont envoyées aux têtes d'impression suivantes.
  3. Procédé pour la commande d'un repérage d'image selon la revendication 2, selon lequel l'étape d'utilisation d'un moyen de capteur pour lire les repères de calage et pour fournir un second signal indiquant la vitesse instantanée de support comprend, de plus, les étapes suivantes :
    l'utilisation de la vitesse instantanée du support pour fournir un troisième signal indiquant l'étirement du support ;
    la correction des écarts d'étirement du support pour les images suivantes ;
    la modification de la vitesse à laquelle sont fournies les données aux têtes d'impression suivantes ; et
    le réglage des données pour forcer une image suivante à adopter une longueur égale à une image précédente.
  4. Procédé pour la commande d'un repérage d'image selon la revendication 1, comprenant, de plus, les étapes suivantes :
    la réalisation de corrections statiques dans la presse à jet d'encre sur papier sans fin pour assurer un bon recouvrement des données d'image sur les images précédemment imprimées ;
    la prévision d'une position en ligne de chaque tête d'impression selon un trajet de ligne directe ;
    l'impression d'un motif de référence sur le support, concernant les images ;
    la mise en marche de la presse à jet d'encre sur papier sans fin à une vitesse relativement faible ; et
    l'alignement de chaque tête d'impression selon un trajet de ligne directe jusqu'à ce que chaque tête d'impression suivante lise exactement la même partie du motif de référence que chaque tête d'impression précédente.
  5. Procédé pour la commande d'un repérage d'image selon la revendication 4, comprenant, de plus, les étapes suivantes :
    la prévision d'un premier repère de référence pouvant être lu par un premier capteur et d'un second repère de référence pouvant être lu par un second capteur ; et
    le réglage de la rotation de chaque tête d'impression selon un axe dans une direction normale à un plan du support jusqu'à ce que le premier capteur lise le premier repère de référence en même temps que la lecture du second repère de référence par le second capteur afin d'assurer un alignement statique de chaque tête d'impression selon un trajet en ligne directe.
  6. Procédé pour la commande d'un repérage d'image selon la revendication 2, comprenant, de plus, les étapes suivantes :
    le montage de la tête d'impression sur une pièce pouvant être déplacée dans une direction sensiblement normale à la direction de déplacement du support ; et
    la prévision d'un moyen d'actionneur pouvant effectuer de légers déplacements de la structure de la tête d'impression, le moyen d'actionneur étant sensible au moyen de capteur pour assurer un recouvrement d'image de précision de l'ordre du sous pixel.
  7. Procédé pour la commande d'un repérage d'image selon la revendication 1, comprenant, de plus, les étapes suivantes :
    la correction d'écarts de décalage de support sur des images suivantes ; et
    la variation des buses de chaque tête de la pluralité de têtes d'impression ayant reçu des données pour l'impression des images suivantes.
  8. Procédé pour la commande d'un repérage d'images imprimées sur un support d'une presse à jet d'encre sur papier sans fin possédant une pluralité de têtes d'impression munies de buses pour l'éjection d'une encre pour l'impression des images, procédé comprenant les étapes suivantes :
    l'impression de repères de calage sur le support, concernant la position d'impression des images ;
    la lecture des repères de calage ;
    l'utilisation des repères de calage pour déterminer des écarts dans l'espace des images suivantes ;
    l'application de corrections dynamiques afin de corriger les écarts dans l'espace des images suivantes pour assurer un bon recouvrement des données d'image sur les images précédemment imprimées ; et
    l'application de corrections statiques afin de corriger des écarts dans l'espace de l'alignement des têtes d'impression suivantes l'une par rapport à l'autre afin d'assurer une bonne référence des données d'image sur les images précédemment imprimées.
  9. Procédé pour la commande d'un repérage d'image selon la revendication 8, selon lequel l'étape d'application de corrections dynamiques comprend, de plus, les étapes suivantes :
    la modification de la vitesse à laquelle sont fournies les données aux têtes d'impression suivantes ; et
    le réglage des données pour obliger une image suivante à adopter une longueur égale à une image précédente.
  10. Procédé pour la commande d'un repérage d'image selon la revendication 8, selon lequel l'étape d'application de corrections statiques comprend, de plus, les étapes suivantes :
    la prévision d'un positionnement en ligne de chaque tête d'impression dans un trajet en ligne directe ;
    l'impression d'un motif de référence sur le support, concernant les images ; et
    l'alignement de chaque tête d'impression selon un trajet en ligne directe de telle façon que chaque tête d'impression lise le même motif de référence.
EP19960301419 1995-03-02 1996-03-01 Compensation d'image au moyen de marques de référence imprimées Expired - Lifetime EP0729846B1 (fr)

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US39776795A 1995-03-02 1995-03-02
US397767 1995-03-02

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EP0729846A3 EP0729846A3 (fr) 1998-06-03
EP0729846B1 true EP0729846B1 (fr) 2000-01-12

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EP3733575A4 (fr) * 2017-12-27 2021-10-06 SCREEN Holdings Co., Ltd. Dispositif de traitement de substrat et procédé de traitement de substrat
US11945240B1 (en) 2023-06-22 2024-04-02 Eastman Kodak Company Image-adaptive inkjet printhead stitching process

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DE69606076T2 (de) 2000-08-31
DE69606076D1 (de) 2000-02-17
EP0729846A3 (fr) 1998-06-03

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