EP1303408B1 - Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees - Google Patents

Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees Download PDF

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Publication number
EP1303408B1
EP1303408B1 EP00938323A EP00938323A EP1303408B1 EP 1303408 B1 EP1303408 B1 EP 1303408B1 EP 00938323 A EP00938323 A EP 00938323A EP 00938323 A EP00938323 A EP 00938323A EP 1303408 B1 EP1303408 B1 EP 1303408B1
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EP
European Patent Office
Prior art keywords
dots
devices
dot
size
printer
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
EP00938323A
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German (de)
English (en)
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EP1303408A4 (fr
EP1303408A1 (fr
Inventor
Kia Silverbrook
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.)
Silverbrook Research Pty Ltd
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Silverbrook Research Pty Ltd
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Publication date
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Priority to AT00938323T priority Critical patent/ATE337916T1/de
Publication of EP1303408A1 publication Critical patent/EP1303408A1/fr
Publication of EP1303408A4 publication Critical patent/EP1303408A4/fr
Application granted granted Critical
Publication of EP1303408B1 publication Critical patent/EP1303408B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors
    • 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
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2121—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter
    • B41J2/2128—Ink jet for multi-colour printing characterised by dot size, e.g. combinations of printed dots of different diameter by means of energy modulation

Definitions

  • This invention relates to digital printing and more particularly to printing using devices which eject ink onto the printed substrate.
  • the invention is not limited to ink ejection devices and is also applicable to laser, light emitting diode printers and to digital photocopiers.
  • a printhead In ink ejection devices a printhead has an array of nozzles through which ink is selectively ejected onto the substrate as the substrate moves relative to the printhead.
  • the printhead may print by scanning across the substrate to print horizontal bands or, if it is a full page width printhead, it may pass along the length of the page.
  • a blocked nozzle will result in multiple horizontal blank lines, in the case of a scanning type printhead, or a blank vertical line in the case of a page width printhead. Such blank lines are undesirable since they detract from the printed result.
  • EP-A-1010531 One example of a conventional method to compensate for the failures in a printed image due to malfunctioning printing elements is shown in EP-A-1010531, for instance.
  • the present invention provides a method of modifying the printing of an image so as to reduce or effectively eliminate the visual effect of one or more blocked nozzles apparent to the eye of an observer in normal use.
  • the invention is applicable to other forms of printing where a device, whether passive or active, is repeatedly used to produce dots of ink or the like on a substrate.
  • the invention has potential application to laser and LED type printers and photocopiers where a fault in the imaging drum or light source can result in repeated faults in the image produced.
  • image is to be understood to have a broad meaning and includes anything printed, such as text and line drawings.
  • the invention provides a method of modifying an image to be digitally printed by a printing device to compensate for failure to correctly print dots of ink at specific locations, the method including the steps of:
  • the invention provides a printer having a row of activatable devices which, when activated, cause rows of dots to be deposited onto a substrate and means to move the substrate relative to the row of devices in a direction generally perpendicular to the row of dots, said printer including:
  • the incorrectly operating device will result in a defect line or lines in the image printed. Usually the incorrectly operating device will produce no ink or not enough ink and so a blank or faint line will be produced. To compensate adjacent ink dots will be caused to be larger than required by the raw image data. Conversely if the incorrectly operating device is producing oversized ink dots, the dot size of adjacent dots will be reduced.
  • the dots in adjacent columns are preferably all adjusted in size. If there are a small minority of locations in the column of the incorrectly operating device which do not require ink, dots in adjacent columns may or may not be adjusted in size.
  • Dots in more than the two adjacent columns may be adjusted in size. Dots in adjacent columns may be adjusted in size only if they are within predetermined vertical or horizontal distances or both of one or more specific location. For example only dots in the columns either side of the failed column may be adjusted in size but dots in those columns two or three rows above and/or below the respective location may be adjusted in size.
  • a printhead 10 has an array of ink jet nozzles 12 arranged in a singe line. For the purpose of explanation only 14 nozzles are shown but in practice there will be from tens to thousands of nozzles arranged in a line. Paper is passed underneath the printhead in a direction generally perpendicular to the line of ink j et nozzles, as indicated by arrow 14.
  • the printhead may be a stationary or a movable printhead. As the paper passes under the printhead the ink jet nozzles A to N are selectively operated to cause an array of ink dots to be placed on the paper. This array is a series of columns and rows, the spacing of which is dependent on the spacing of the inkjet nozzles and the minimum paper feed step respectively.
  • the printhead may be a page width printhead or a smaller printhead which scans across the page to lay down a series of transverse bands of printing.
  • inkjets a-g and i-n inclusive are operating correctly but, for whatever reason, inkjet h is not operating correctly or at all. It is also assumed that the diagnostic systems of the printer, which will be well understood by those skilled in the art, have detected that nozzle h is not functioning correctly. In most cases, a malfunctioning device will be partially or totally blocked resulting in insufficient or no ink being deposited on the paper.
  • FIG 2 which schematically shows a portion of printing performed by the printhead 10 without fault correction
  • h a blank column
  • i-n a blank line appearing in the printing depending on whether the printhead 10 is a full page width printhead or a scanning type printhead.
  • the unshaded circles numbered 16, 18, 20 and 22 represent drops of ink which should have been printed in column h but were not.
  • Figure 3 shows the same image printed by the printhead 10 but with fault correction according to an embodiment of the invention operational.
  • the ink drops in columns g and i are caused to be larger than normal, as will be explained below. This reduces the amount of white space between the dots and between the columns g and i.
  • the effect is that the un-printed column h is not apparent to the eye of the user.
  • the effect occurs at about 1600dpi and upwards.
  • each adjusted size dot is preferably increased by about 50% but this may be more or less, as needed.
  • the oversize dots in the two columns may just touch dots in the same column. However, the size increase may be less, such that the dots in each of the two columns of dots do not join, or may be greater, such that adjacent dots overlap.
  • oversize drops will be deposited continuously by nozzles g and i. It will be appreciated that when ink dots are deposited less frequently the drop size of ink in columns g and i will only increase adjacent or near to areas where drops should occur in column h. These oversize drops may extend into rows where no ink is intended in column h. Where ink is not intended in column h for large distances, preferably no oversize drops will be created in columns g and i.
  • dots of ink are required, but not printed, in column h at rows 1, 2, 3, 5 and 7, as indicated by open circles 30, 32, 34, 36 and 38.
  • dots in columns g and I are increased in size in rows above and below un-printed dots 30, 32, 34, 36 and 38. Because there are more dots in these columns than compared to the figure 2 and 3 prints, the oversize dots overlap more and reduce the white space to a greater extent.
  • normal or oversize dots may be printed in vacant locations, such as column g, rows 1 and 5 and column I rows 2, 3 and 7.
  • increased dot size is achieved by increasing the amount of ink ejected.
  • this may be achieved by increasing the duration of the heating current pulse.
  • this may be by increasing the driving voltage or current to cause greater distortion or by increasing the pulse duration.
  • the pulse width and/or driving voltage or current may be increased.
  • the invention is also applicable to situations where individual devices are producing too much ink, in which case the adjacent devices may be adjusted to reduce the dot size of ink dots produced.
  • this technique may be used with laser and LED printers and photocopiers and other types of digital printers where the placement of an ink dot is dependent on individual activation of a device or component.
  • an LED in a LED printer may fail or there may be a defect in the photoconductive imaging drum of a laser printer.
  • adjusting the size of adjacent dots can hide or reduce the visual effect of the defect in the device or component.
  • dot size may be modified by modulating the intensity and or total amount of the light falling on the corresponding portion of the photoelectric imaging drum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Facsimile Heads (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (15)

  1. Procédé de modification d'une image qui doit être imprimée de manière numérique par un dispositif d'impression afin de compenser des défaillances dans l'impression correcte de taches d'encre à des emplacements spécifiques, le procédé incluant les étapes consistant à :
    a) identifier ledit ou lesdits emplacement(s) spécifique(s), et
    b) ajuster la taille de tache d'au moins une tache à un emplacement adjacent ou proche de l'emplacement spécifique respectif par rapport à celle requise par les données image.
  2. Procédé selon la revendication 1, dans lequel la taille de tache de ladite ou desdites tache(s) ajustée(s) est augmentée si aucune tache n'est imprimée à l'emplacement spécifique respectif ou si une tache de trop petite taille y est imprimée.
  3. Procédé selon la revendication 1, dans lequel la taille de tache desdites taches ajustées est réduite si une gouttelette de trop grande taille est imprimée à l'emplacement spécifique respectif.
  4. Procédé selon la revendication 1, dans lequel des taches situées de manière espacée à la fois transversalement et longitudinalement par rapport à l'emplacement respectif sont ajustées en taille.
  5. Procédé selon la revendication 1, dans lequel des taches choisies parmi des taches ajustées à une taille supérieure sont en contact ou en chevauchement avec des taches adjacentes.
  6. Procédé selon la revendication 1, dans lequel des taches choisies parmi les taches ajustées en taille ne sont ni en contact ni en chevauchement avec des taches adjacentes.
  7. Imprimante comprenant une rangée de dispositifs susceptibles d'être activés qui, lorsqu'ils sont activés, provoquent la déposition de rangées de taches sur un substrat, et des moyens pour déplacer le substrat par rapport à la rangée de dispositifs dans une direction généralement perpendiculaire à la rangée de taches, ladite imprimante incluant :
    des moyens pour déterminer si un ou plusieurs desdits dispositifs ne fonctionne(nt) pas correctement ; et
    des moyens de commande pour analyser des images ou des données image et pour identifier un ou plusieurs emplacement(s) spéclflque(s) auquel/auxquels une tache d'encre devrait être imprimée par activation d'un dispositif qui fonctionne de manière incorrecte et pour ajuster la taille de tache produite par l'un des dispositifs disposés de part et d'autre du dispositif défaillant, ou par les deux.
  8. imprimante selon la revendication 7, dans laquelle les moyens de commande ajustent la taille des taches déposées dans la même rangée que l'emplacement spécifique respectif par l'un des dispositifs disposés de part et d'autre du dispositif défaillant, ou par les deux.
  9. Imprimante selon la revendication 7, dans lequel les moyens de commande ajustent la taille des taches déposées par l'un des dispositifs de part et d'autre du dispositif défaillant, ou par les deux, dans au moins une rangée adjacente ou proche de la rangée de l'emplacement spécifique respectif.
  10. Imprimante selon la revendication 7, dans laquelle, si aucune tache n'est produite par activation du dispositif qui fonctionne de manière incorrecte, ou si une tache de trop petite taille est produite par celui-ci, la taille des taches produites par activation de l'un ou des deux dispositifs adjacents au dispositif fonctionnant de manière Incorrecte est augmentée.
  11. Imprimante selon la revendication 7, dans laquelle les dispositifs sont des dispositifs d'éjection d'encre thermo-mécaniques et ledit sysléme de commande amène lesdits dispositifs d'éjection à être activés pendant une période temporelle plus longue, ou leur fournit un signal de pilotage plus intense, ou les deux.
  12. Imprimante selon la revendication 7, dans laquelle lesdits dispositifs sont des dispositifs émetteurs de lumière, et dans laquelle la quantité de lumière émise par lesdits dispositifs émetteurs de lumière est ajustée.
  13. Imprimante selon la revendication 7, dans laquelle lesdits dispositifs sont des portions d'un tambour d'imagerie photoconducteur, et la taille de tache desdites taches ajustées est ajustée en faisant varier la quantité de lumière à laquelle le dispositif respectif est exposé.
  14. Imprimante selon la revendication 7, dans laquelle au moins certaines des taches ajustées à une taille supérieure sont en contact ou en chevauchement avec des taches adjacentes.
  15. Imprimante selon la revendication 7, dans laquelle des taches de taille ajustée ne sont ni en chevauchement ni en contact avec des taches adjacentes.
EP00938323A 2000-06-30 2000-06-30 Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees Expired - Lifetime EP1303408B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT00938323T ATE337916T1 (de) 2000-06-30 2000-06-30 Tintenstrahlfehertoleranz unter verwendung von tropfen in übergrösse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU2000/000750 WO2002002329A1 (fr) 2000-06-30 2000-06-30 Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees

Publications (3)

Publication Number Publication Date
EP1303408A1 EP1303408A1 (fr) 2003-04-23
EP1303408A4 EP1303408A4 (fr) 2004-09-15
EP1303408B1 true EP1303408B1 (fr) 2006-08-30

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EP00938323A Expired - Lifetime EP1303408B1 (fr) 2000-06-30 2000-06-30 Tolerance aux defauts d'impression par jets d'encre utilisant des gouttelettes surdimensionnees

Country Status (8)

Country Link
EP (1) EP1303408B1 (fr)
JP (1) JP2004501007A (fr)
CN (1) CN1182964C (fr)
AU (2) AU2000253740B2 (fr)
DE (1) DE60030484T2 (fr)
IL (1) IL166720A (fr)
WO (1) WO2002002329A1 (fr)
ZA (1) ZA200210189B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101935238B1 (ko) 2012-04-20 2019-01-04 제록스 코포레이션 결함이 있는 잉크젯들에 대한 보상 시스템 및 방법

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7201462B2 (en) * 2002-07-24 2007-04-10 Canon Kabushiki Kaisha Ink jet printing apparatus and method for correcting ejection driving
US7407264B2 (en) * 2002-10-01 2008-08-05 Sony Corporation Liquid discharging apparatus and liquid discharging method
US8042899B2 (en) * 2008-03-17 2011-10-25 Xerox Corporation System and method for compensating for weak, intermittent, or missing inkjets in a printhead assembly
JP6232871B2 (ja) * 2013-09-12 2017-11-22 セイコーエプソン株式会社 インクジェットプリンター、および印刷方法
US10391784B2 (en) * 2015-10-08 2019-08-27 Kornit Digital Ltd. Concealing missing nozzles
DE102016203917A1 (de) * 2016-03-10 2017-09-14 Heidelberger Druckmaschinen Ag Verfahren zur Kompensation ausgefallener Druckdüsen in einer Inkjet-Druckmaschine
JP6888244B2 (ja) * 2016-03-28 2021-06-16 セイコーエプソン株式会社 液滴吐出制御装置、液滴吐出制御方法、および液滴吐出装置
DE102016211578A1 (de) * 2016-06-28 2017-12-28 Heidelberger Druckmaschinen Ag Druckdüsenkompensation durch abweichende Druckdüsen
DE102018202045A1 (de) * 2017-03-08 2018-09-13 Heidelberger Druckmaschinen Ag Multilevel-Dichtekompensation für Digitaldruckmaschinen
DE102018201674A1 (de) * 2017-03-15 2018-09-20 Heidelberger Druckmaschinen Ag Missing-Nozzle-Korrektur durch Mehrfachraster
CN108327402B (zh) * 2018-01-11 2020-08-14 佛山希望数码印刷设备有限公司 陶瓷喷墨打印抽点补偿色差控制法
CN111791608B (zh) * 2020-09-10 2021-02-26 季华实验室 一种喷墨打印头无缝拼接的误差调整方法
CN114683726B (zh) * 2020-12-25 2024-05-24 深圳市汉森软件股份有限公司 图像数据分组打印方法、装置、控制板、设备及存储介质

Family Cites Families (4)

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US6069645A (en) * 1994-10-31 2000-05-30 Hewlett-Packard Company Method and apparatus for controlling dot size in image forming apparatus having an array of lasers
JP2000062159A (ja) * 1998-08-17 2000-02-29 Oce Technol Bv 印刷装置のドット生成ユニットの故障を補償する方法
EP0983855A3 (fr) * 1998-08-31 2000-08-02 Hewlett-Packard Company Substitution de points pour la compensation des buses à jet d'encre défaillantes
US6270187B1 (en) * 1998-12-14 2001-08-07 Hewlett-Packard Company Method and apparatus for hiding errors in single-pass incremental printing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101935238B1 (ko) 2012-04-20 2019-01-04 제록스 코포레이션 결함이 있는 잉크젯들에 대한 보상 시스템 및 방법

Also Published As

Publication number Publication date
CN1454148A (zh) 2003-11-05
ZA200210189B (en) 2003-08-27
AU5374000A (en) 2002-01-14
DE60030484T2 (de) 2007-03-29
AU2000253740A1 (en) 2002-04-11
IL166720A0 (en) 2006-01-15
AU2000253740B2 (en) 2004-05-06
EP1303408A4 (fr) 2004-09-15
JP2004501007A (ja) 2004-01-15
DE60030484D1 (de) 2006-10-12
IL166720A (en) 2007-10-31
CN1182964C (zh) 2005-01-05
EP1303408A1 (fr) 2003-04-23
WO2002002329A1 (fr) 2002-01-10

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